Most Down Articles

Published in last 1 year | In last 2 years| In last 3 years| All| Most Downloaded in Recent Month | Most Downloaded in Recent Year|

Most Downloaded in Recent Year

Please wait a minute...


For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails

Select

Stress distribution of coal pillar with gob-side entry driving in the process of excavation & mining ZHENG Xi-Gui, YAO Zhi-Gang, ZHANG Nong Journal of Mining & Safety Engineering    2012, 29 (4): 459-465.   Abstract （7420）      PDF（pc） （676KB）（5585）       Knowledge map    Save The stress distribution of coal pillar with different width in the stage of excavation and mining was studied based on the theory analysis, numerical simulation, engineering practice, the similarities and differences of stress evolution of coal pillar and entity sidewall caused by different width of coal pillar was analyzed. The opinion was put forward that the infection of roadway driving and coal mining need considered simultaneously when determination the reasonable width for coal pillar. The results show that the proper width of coal pillar should large than six meters for the deformation is attenuation with the increased with of coal pillar. However, the increased width coal pillar such as eight meters not only have reduced contribution ratio to control the sidewall deformation in the stage of coal mining, but also caused top and floor deformation increased. Therefore, the reasonable width of coal pillar is eight meters. Related Articles | Metrics

Select

InSAR-based monitoring and analysis of ground subsidence in old goaf DENG Kazhong，WANG Liuyu，FAN Hongdong Journal of Mining & Safety Engineering    2015, 32 (6): 918-922.   Abstract （1532）      PDF（pc） （358KB）（2268）       Knowledge map    Save The foundation stability of old mine goaf is the key to reusing abandoned subsided land, and it needs quantities of measured data to analyze and evaluate. The traditional monitoring methods, highly precise as they are, cannot obtain historical and large-area data of subsidence. Aiming at this problem, this paper has taken the subsidence monitoring of a mine in Shaanxi province as a research subject, and the subsidence data of the mine has been obtained by processing and analyzing 19 TerraSAR images by using InSAR technology. The deformation rules of old goaf have been analyzed. Empirical formulas of subsidence velocity circulating peak and mining thickness, subsidence velocity cycle and ratio of mining depth to mining thickness and mining velocity, mining face cumulative subsidence and mining stopping halt have been established. These rules and empirical formulas can provide reference for prediction and evaluation of old goaf residual deformation. Related Articles | Metrics

Select

Study on the coupled relationship between AE accumulative ring-down count and damage constitutive model of rock WU Xianzhen, LIU Jianwei, LIU Xiangxin, ZHAO Kui, ZHANG Yanbo Journal of Mining & Safety Engineering    2015, 32 (1): 28-34.   Abstract （4970）      PDF（pc） （489KB）（6645）       Knowledge map    Save In order to study the relationship between acoustic emission characteristic parameters and strain, stress and damage variable of rock under different failure models, the tests have been made to obtain the characteristics of acoustic emission of sandstone, leptynite, granite and limestone using hydraulic-pressure servo testing system RMT-150C and acoustic emission instrument SAEU2S under the uniaxial compression. Results have shown that the cumulative acoustic emission ring-down count of rocks with brittle or brittle-ductile failure model increases sharply before the peak stress, while accumulative ring-down count of rock with ductile failure model surges before a quiet period, which can be considered as a precursor for entering failure phase. With time being intermediate variable, the relational model between cumulative acoustic emission and strain generated from rock with brittle, brittle-ductile and ductile failure has been set up, and the coupled relation among cumulative acoustic emission, damage variable and stress has been deduced based on the Weibull distribution constitutive model. Proved by the test data, the precision of constitutive model with brittle, ductile failure is higher, which can provide accurately the basis for rock damage assessment. Related Articles | Metrics

Select

Experimental study on the seepage characteristics of cemented broken mudstone YU Bangyong，CHEN Zhanqing，WU Yu，ZHANG Shaobo，YU Linli Journal of Mining & Safety Engineering    2015, 32 (5): 853-858.   Abstract （1595）      PDF（pc） （370KB）（1879）       Knowledge map    Save Under the action of corrosion, abrasion and erosion from groundwater, the cementation structure in Karstic collapse column is broken and some particles are lost. As the action continues for a certain time, the seepage burst will occur. In order to study the water inrush mechanism of Karstic collapse column, the original designed compacting device and seepage experiment system of broken rock have been used to complete the seepage experiment of cemented broken mudstone. The influence of cementing material, water pressure, broken mudstone size distribution and initial porosity on seepage characteristics has been analyzed. The results have shown that: 1) With cementing strength increasing, the duration time of seepage burst gets longer; When the cementing material is cement, the seepage capacity tends towards stability without burst. 2) With the water pressure increasing, the duration time of seepage burst gets shorter by an exponential function. 3) With the Talbol power exponent increasing, the rock particles in big sizes get more and the water-blocking ability strengthens. 4) With initial porosity increasing, the seepage capacity strengthens. The duration time of seepage burst gets shorter through an exponential function. Related Articles | Metrics

Select

Nondestructive Testing Principle and Technology of Hydraulic Supports by Ultrasonic Phased Array in Top Coal Caving Face YIN Shuai-Feng, HE Fu-Lian Journal of Mining & Safety Engineering    2012, 29 (3): 328-333.   Abstract （6544）      PDF（pc） （1018KB）（11097）       Knowledge map    Save ased on the necessity of nondestructive testing of hydraulic supports in top coal caving face, the nondestructive testing technology of one-dimensional ultrasonic phased array was proposed in this paper, to accurately inspect the large-scale electromechanical equipment and its components with relatively complex geometric figures. According to the mobile column detection of ZFG10000/23/37H hydraulic supports, the basic principles of phase-controlled focus and phase delay was conducted. Combined with the normalized acoustic pressure function of single element, the significance of sine gain weighted apodization technology was analyzed when applied into reducing the definition of output waveform influenced by sidelobe. Finally, in view of the detection of weld cracking shields at 5201 working face in Wujiagou coalmine, the composition and testing process of nondestructive detection were illuminated. The application examples indicate that the internal micro-fractures and surface interpenetrated fractures of shields can be accurately quantified and located by nondestructive testing technology of one-dimensional ultrasonic phased array, and the development direction and interpenetrated tendency of the fractures can be also exactly judged, according to the results of three-dimensional imaging output. Related Articles | Metrics

Select

Numerical Simulation for Determining the Safe Roof Thickness and Critical Goaf Span ZHANG Min-Si, ZHU Wan-Cheng, HOU Zhao-Song Journal of Mining & Safety Engineering    2012, 29 (4): 543-548.   Abstract （8300）      PDF（pc） （537KB）（5055）       Knowledge map    Save In order to determine the relationship between goaf roof thickness and critical span, an iron ore goaf is taken as an engineering instance. The rock mass mechanical parameters are obtained from the mechanical experiments of rock specimens sampled in situ. The relationship between the safe roof thickness and the critical goaf span is determinined according to K. B. Lu Peinie equation, ratio of thickness and span equation, structure mechanics of girder and plate beam equation. Meanwhile, the damage and failure process of goaf roof is simulated by RFPA numerical simulation program. The relationship between the safe roof thickness and the critical goaf span is determined, respectively, when the initial damage and instability of goaf roof are adopted as the criteria. The values predicted with K. B. Lu Peinie equation are most close to the numerical ones when the damage of roof begians. The ratio between them can be considered as a safety factor obtained from the numerical simulations. As it shows, it is kept a large safety factor by the critical roof thickness which is calculated by K. B. Lu Peinie equation. The numerical simulation with RFPA could obtain this safety factor, and it may have more extensive applicability. Related Articles | Metrics

Select

Comparison and cause analysis of roadway failure characteristics between gob-side entry retaining with roadway advance excavation and general gob-side entry retained method#br# Journal of Mining and Safety Engineering    2023, 40 (6): 1129-1138.   DOI: 10.13545/j.cnki.jmse.2022.0278 Abstract （270）      PDF（pc） （10405KB）（221）       Knowledge map    Save Related Articles | Metrics

Select

Determining the reasonable width of narrow pillar of roadway in gob entry driving in the large pillar ZHANG Kexue, JIANG Yaodong, ZHANG Zhengbin, ZHANG Yongping, PANG Xufeng, ZENG Xiantao Journal of Mining & Safety Engineering    2014, 31 (2): 255-262.   Abstract （4301）      PDF（pc） （2691KB）（2460）       Knowledge map    Save Gob entry driving in the large pillar is a new technology based on double U-shaped roadway layout of the face. According to the geological conditions, certain method of reasonable width of narrow pillar in gob entry driving in the large pillar is obtained based on the combination of limit equilibrium theory, numerical calculation and field practice. It takes into account six parameters for the narrow pillar width from distribution of stress of the section of the lateral support goaf, stress distribution of coal pillars, stress distribution of surrounding rock, plastic zone distribution of surrounding rock, the relationship between deformation of surrounding rock and pillar width and limit equilibrium theory of narrow pillar width, and finally it is determined that the narrow pillar width is five meters. Then deep analysis is conducted to the impact of stress distribution law between narrow pillar and wide pillar to this section face mining. Related Articles | Metrics

Select

Research on the mechanical activation mechanism of coal slime based grouting filling materials for residual coal remining#br# Journal of Mining and Safety Engineering    2023, 40 (6): 1243-1252.   DOI: 10.13545/j.cnki.jmse.2023.0137 Abstract （147）      PDF（pc） （4601KB）（203）       Knowledge map    Save Related Articles | Metrics

Select

Coal Wall Stability of Fully Mechanized Working Face with Great Mining Height in “Three Soft” Coal Seam and Its Control Technology YUAN Yong, TU Shi-Hao, MA Xiao-Tao, SUN Lu-Lu, BAI Qing-Sheng Journal of Mining & Safety Engineering    2012, 29 (1): 21-25.   Abstract （4040）      PDF（pc） （469KB）（3322）       Knowledge map    Save   To effectively control the coal wall stability of fully mechanized working face in “three soft” coal seam，we measured the characteristics of coal wall falling at NO.7219 fully mechanized face with great mining height in Xutuan Coal Mine of Huaibei Mining Group，built the mechanical model for stability analysis of wedge sliding object in coal wall，and analyzed the key effect factors of the sliding object stability．The results show that the coal wall falling in fully mechanized face with great mining height in “three soft” seam occurs mainly in wedge sliding type in the upper part of coal wall，and the stability coefficient of wedge sliding object (K) is proportional to C，Ph and μ， and inversely proportinal to W0 and θ．By adopting technical measures of increasing the support resistance，controlling end face roof fall, strengthening coal wall，correctly using guard plate，appropriately increasing the advancing speed，et al，the coal wall stability of NO.7219 face has been effectively controlled． Related Articles | Metrics

Select

Numerical simulation of explosion-proof safety distance and propagation characteristics of gas deflagration JIANG Bing-you, LIN Bai-quan, CHEN Jian, GUO Chang, ZHANG Peng Journal of Mining & Safety Engineering    2014, 31 (1): 139-145.   Abstract （1573）      PDF（pc） （417KB）（2047）       Knowledge map    Save In this paper, an explosion roadway with the length of 100 m and cross-sectional area of 0.08 m×0.08 m was established by using AutoReaGas Software, where the methane/air mixture gas with 9.5% fuel concentration is distributed uniformly within the first 10 m of the roadway. The results show that the maximum explosion overpressure presents a changing trend of decreasing, increasing, and decreasing again in the process of gas explosion propagation, and reaches its maximum value near the location where the flame is extinguished. Both the maximum combustion rate and flame propagation speed increase firstly with the increase of propagation distance, and then begin to decrease after obtaining their corresponding maximum values. The maximum overpressure and gas velocity have reduced to zero at the distance of 35 m from the ignition source, and the maximum density also has decreased to its initial value at this distance. These trends indicate that the explosion-proof safety distance is 35 m under this condition. The maximum combustion rate and flame propagation speed have reduced to zero at the distance of 17 m, which indicates that the maximum distance of flame propagation is 17 m. The occurrence of gas backflow is related to flame propagation. The research results can provide references to optimal route determination for avoiding gas explosion disasters in underground coal mines, the emergency rescue and disaster relief after gas explosion, the explosion accident investigation, and so on. Related Articles | Metrics

Select

Creep failure mechanism and control of the deep soft rock roadway in Pingdingshan mining area#br# Journal of Mining and Safety Engineering    2023, 40 (6): 1139-1150.   DOI: 10.13545/j.cnki.jmse.2022.0294 Abstract （216）      PDF（pc） （22911KB）（181）       Knowledge map    Save Related Articles | Metrics

Select

Width optimization of narrow coal pillar of roadway driving along goaf in fully mechanized top coal caving face QI Fangkun，ZHOU Yuejin，CAO Zhengzheng，ZHANG Qi，LI Ning Journal of Mining & Safety Engineering    2016, 33 (3): 475-480.   Abstract （1034）      PDF（pc） （338KB）（1150）       Knowledge map    Save The width of the narrow coal pillar of roadway driving along goaf is the key factor affecting the surrounding stability of the mining roadway in fully mechanized top coal caving face. Based on the abutment pressure distribution characteristics and the ultimate balanced theory, the reasonable width of narrow coal pillar should be chosen between 4.1m and 7.2 m, combined with the engineering condition in workface 3309 of a mine in Shandong. In order to optimize the width of the narrow coal pillar, the effect of plastic area distributions and stress distribution characteristics of the two sides of coal pillar under conditions of different width of narrow coal pillar have been studied by numerical analysis. The optimal width of coal pillar is 5 m. The validity of the optimal coal pillar width was verified by the engineering practice in workface 3309. Field monitoring has indicated that the surrounding rock deformation of the mining roadway could meet the requirements of safety production. Related Articles | Metrics

Select

Analysis of fluid-solid coupling mechanism of water-bearing weakly cemented surrounding rock-filling layer-drilling shaft lining in the west of China#br# Journal of Mining and Safety Engineering    2023, 40 (6): 1177-1190.   DOI: 10.13545/j.cnki.jmse.2022.0646 Abstract （132）      PDF（pc） （2428KB）（166）       Knowledge map    Save Related Articles | Metrics

Select

Characteristics and mechanism of stope abutment pressure during the whole process#br# Journal of Mining and Safety Engineering    2023, 40 (6): 1219-1230.   DOI: 10.13545/j.cnki.jmse.2022.0312 Abstract （145）      PDF（pc） （2793KB）（175）       Knowledge map    Save Related Articles | Metrics

Select

Studies on Establishment and Application of Microseismic Monitoring System in Hongtoushan Copper Mine LIU Jian-Po, SHI Chang-Yan, LI Yuan-Hui,et al Journal of Mining & Safety Engineering    2012, 29 (1): 72-77.   Abstract （6022）      PDF（pc） （624KB）（4593）       Knowledge map    Save In this paper，in view of the serious conditions of ground pressure (rock burst，etc) appeared in Hongtoushan copper mine，we established a microseismic monitoring system in the mine，and analyzed the relationship between the microseismic activities and mining operation，and the spatial distribution of microseismic events，applied the energy index and apparent volume to forecast the occurrence of large scale rock fracturing．The location results using manual fixed-point blasting show that the location error of microseismic monitoring system is less than 10m，which suggests that the system can reach the requirement for ground pressure disaster monitoring in mine．Microseismic activities can be divided into two quiet periods and three active periods．There exits the incubation and early-warming periods before the large scale rock fracturing．The quick drop of energy index and the continuous increase of apparent volume can be used as the precursory characteristics of rock burst and large scale rock fracturing．Through the cloud charts of energy index and displacement，the potential danger areas of ground pressure disasters can be judged，which can be used to guide the safety management and ensure safety production in deep mine． Related Articles | Metrics

Select

Occurrence characteristics and distribution of paragenetic commercial minerals and associated minerals in coal-bearing strata in China#br# Journal of Mining and Safety Engineering    2024, 41 (1): 29-46.   DOI: 10.13545/j.cnki.jmse.2023.0479 Abstract （171）      PDF（pc） （7007KB）（163）       Knowledge map    Save Related Articles | Metrics

Select

Gas drainage radius and borehole distance along seam LU Yi，SHEN Hongmin，QIN Botao，ZHANG Leilin，MA Hongfen，MAO Taoliang Journal of Mining & Safety Engineering    2015, 32 (1): 156-162.   Abstract （2668）      PDF（pc） （422KB）（2061）       Knowledge map    Save To determine the reasonable distance of gas drainage boreholes in coal seam being mined, based on the control equations of seepage and deformation fields, and the coupling equations of porosity and permeability, the solid and gas coupling mathematical model of gas seepage in drilling extraction was established. The drainage radius of gas extraction borehole in current coal seam was calculated by numerical simulation, and the relation between the borehole distance and extraction radius of single-borehole was deduced. Taking coalface 15107 of Huangyanhui coal mine for example, by the gas drainage experiments of single drilling and multiple drillings in this face, the correctness of the drainage radius, and the relation between borehole distance and extraction radius were calculated and verified. The research results provide a scientific basis for gas extraction. Related Articles | Metrics

Select

Failure Mechanism and Control Measure of Roadway Deformation with Fractured Surrounding Rock in Deep Mine FANG Xin-Qiu, ZHAO Jun-Jie, HONG Mu-Yin Journal of Mining & Safety Engineering    2012, 29 (1): 1-7.   Abstract （4876）      PDF（pc） （656KB）（4372）       Knowledge map    Save To solve the support problem of fractured surrounding rock roadway in deep mine，based on the geological conditions of west track haulage roadway in Xuehu coal mine，we established the mechanical model of roadway floor heave，and studied the failure characteristics and influence factors of the surrounding rock in this paper．The results show that the fractured surrounding rocks around two sides of the roadway have natural pressure relief effect which can delay the formation of floor heave．With the compaction of surrounding rocks in the two sides，the stress continues to transfer toward the floor which then initiates the floor heave．Hereby，the secondary support technology is proposed to control the roadway deformation with fractured surrounding rock in deep mine，that is to say，the U-steel yieldable support is adopt as the first support，while the bolt-grouting and bolt-beam-net-anchor cable support are adopt as the second support．The greatest characteristic of the technique is altered from the lagging grouting to timely grouting，which provides a platform for exerting the anchorage effect of bolt，and the support efficiency is improved greatly．The final support parameters are determined by numerical simulation optimization，and have applied to the field industrial test．The observation results show that the roadway deformation is controlled effectively，and has obtained great social and economic benefits． Related Articles | Metrics

Select

Research on deep jointed rock fragmentation by TBM cutters and cutters spacing optimization SUN Jianzhong，YANG Shengqi，WEN Sen Journal of Mining & Safety Engineering    2015, 32 (1): 126-131.   Abstract （1219）      PDF（pc） （500KB）（1822）       Knowledge map    Save In order to optimize the layout of TBM cutters on deep jointed rock and improve the efficiency of TBM, two-dimensional discrete element software UDEC has been used to research the impact of joint spacing, angle and the cutter spacing on the rock fragmentation. The results show that when the joint spacing is 50 mm, cracks extend to the joint surface and spread along the tilt direction despite the barrier effect and the various angle of joints; when the joint spacing is not more than 100 mm, the rock cracks can extend to the joints but the crack propagations is controlled by the joints; when the joint spacing is no less than 150 mm, joints have no impact on the break rocks because the propagation of crack can’t reach the joints. When the spacing of horizontal joints is small, the joints will affect the rock fragmentation and the effects may gradually weaken until disappear with the increase of the joint spacing. The reducing joint spacing resulted in the best cutter spacing reduce when the small joint angle is 30° and the smaller joint spacing was better to break rock when the joint angle is 60°. The best penetration rises gradually with the joint angle increasing and increase more quickly from 2 mm to 7 mm when the joint angle increases from 0° to 90°. Related Articles | Metrics

Select

“O-X” failure pattern of roof and strata-pressure behavior under complex geological conditions LIU Honglei，YANG Tianhong，ZHANG Penghai，LI Yang，QIN Tao，YU Qinglei Journal of Mining & Safety Engineering    2015, 32 (5): 793-800.   Abstract （1868）      PDF（pc） （1650KB）（2259）       Knowledge map    Save In this paper, on-site monitoring, theoretical analysis and numerical simulation were used to study the strata pressure behavior and “O-X” failure law of roof under complex geological conditions in Da’anshan coal mine. Roof caving characteristic and strata pressure behavior in No.13 coal face of Da’anshan coal mine were studied through ground pressure monitoring system. Additionally, based on the field monitoring data, numerical model was established to study the formation, evolution and fracturing law of roof plastic zone during mining process. The results show that the support resistance in the middle of working face is significantly greater than those in the upper and lower parts. During the weighting period, the average length of stress concentration in the gateways is 12.17 m and 9.46 m respectively ahead of the face, and the corresponding maximum pressure is 24 MPa and 23.57 MPa respectively. In addition, the“O-X”fracture structure was obtained through numerical simulation and theoretical analysis. The first weighting and periodic weighting steps obtained by numerical simulation are basically consistent with the on-site monitoring. Related Articles | Metrics

Select

Analysis and prediction of vertical shaft freezing pressure in deep alluvium based on RBF fuzzy neural network model YAO Ya-Feng, CHENG Hua, RONG Chuan-Xin, LI Ming-Jing, CAI Hai-Bing, SONG Jian Journal of Mining & Safety Engineering    2016, 33 (1): 70-76.   Abstract （1630）      PDF（pc） （371KB）（2807）       Knowledge map    Save The field measurement of varied monitoring levels about the shaft freezing pressure in Dingji mine has shown that the freezing pressure changes with time and circumstance. It is easily influ- enced by many factors, such as strata depth, geotechnical moisture content, average freezing wall thick- ness and mean temperature, and that it has obvious uncertainty. The degree of uncertainty has been characterized by the variation coefficient, laying a foundation for optimizing the traditional RBF neural network and introducing variation coefficient of freezing pressure to fuzzy central value and weight value learning strategy to establish prediction model of shaft freezing pressure in deep alluvium. With variables of strata depth, geotechnical moisture content, average freezing wall thickness and mean tem- perature as the input information, the model has been used to distinguish clay strata and calcareous clay strata in training and learning with sample data from thirty three monitoring levels in seven shafts of Huainan and Huaibei areas, and finally has made an engineering prediction for the shaft freezing pres- sure in Kouzidong mine. The results have shown that the field measurement has well fitted with the pre- diction; the efficient and precise model algorithm has provided reliable basis for analysis and prediction of vertical shaft freezing pressure in deep alluvium of Huainan and Huaibei areas. Related Articles | Metrics

Select

Geological genesis and mineralizing process of co-existed and associated minerals in coal series#br# Journal of Mining and Safety Engineering    2024, 41 (1): 15-28.   DOI: 10.13545/j.cnki.jmse.2023.0480 Abstract （168）      PDF（pc） （4121KB）（162）       Knowledge map    Save Related Articles | Metrics

Select

Study on Influence of Temperature on Anchorage Performance of Resin Anchored Bolt HU Bin, KANG Hong-Pu, LIN Jian, CAI Jia-Fang Journal of Mining & Safety Engineering    2012, 29 (5): 644-649.   Abstract （5783）      PDF（pc） （506KB）（4585）       Knowledge map    Save To analyze the phenomenon that anchoring force of resin anchored bolt often decreased where rock bolting was carried out in the roadway near spontaneous combustion region, we studied the influence of temperature on anchoring performance of resin anchored bolts in this paper, by using the comprehensive research of laboratory test and numerical simulation. The results of pull-out tests of resin anchored bolts under different temperatures show that temperatures have great influence on anchorage performance of resin anchored bolt. The anchoring force is the largest when the temperature is 25℃, and the anchoring force descends obviously with the borehole temperature increases. Additionally, FLAC3D was adopted to simulate and analyze the anchorage system of single bolt support small-scale, and the results show that the coupled multi-physics processes exist to a certain extent between the stress field and temperature field of rock mass. The stress distribution states of rock mass are different under the same external load when the temperatures of heat source are different. On the basis, we find that the temperature variations have a certain effect on physical and mechanical properties of rock mass and curing reaction process of resin capsules, and put forward the technological approaches to ensure supporting effect under different temperatures. Related Articles | Metrics

Select

Mechanism of rock breaking by deep hole ultra-deep cut blasting and the optimum ultra-deep value determination#br# Journal of Mining and Safety Engineering    2023, 40 (6): 1210-1218.   DOI: 10.13545/j.cnki.jmse.2022.0122 Abstract （152）      PDF（pc） （5480KB）（157）       Knowledge map    Save Related Articles | Metrics

Select

The energy dissipation characteristics of surrounding rock during roadway excavation#br# Journal of Mining and Safety Engineering    2024, 41 (1): 142-150.   DOI: 10.13545/j.cnki.jmse.2023.0475 Abstract （167）      PDF（pc） （7312KB）（155）       Knowledge map    Save Related Articles | Metrics

Select

Width optimization and application of narrow coal pillar in gob-side entry driven in thick coal seam in Luzigou Mine#br# Journal of Mining and Safety Engineering    2023, 40 (6): 1151-1160.   DOI: 10.13545/j.cnki.jmse.2022.0251 Abstract （166）      PDF（pc） （3044KB）（155）       Knowledge map    Save Related Articles | Metrics

Select

Time-dependent rheological model of rock based on discrete element method#br# Journal of Mining and Safety Engineering    2023, 40 (6): 1273-1280.   DOI: 10.13545/j.cnki.jmse.2022.0302 Abstract （124）      PDF（pc） （3603KB）（154）       Knowledge map    Save Related Articles | Metrics

Select

Water loss settlement simulation of thick unconsolidated confined aquifer layer XU Liangji，ZHU Nan，MA Rongzhen，LIU Xiaopeng Journal of Mining & Safety Engineering    2015, 32 (5): 821-826.   Abstract （1413）      PDF（pc） （239KB）（1959）       Knowledge map    Save To reveal the mechanism of surface movement and deformation caused by water loss in thick unconsolidated confined aquifer during coal mining, based on specially designed experimental equipment, the water loss settlement experiment of unconsolidated confined aquifer was carried out, and the effect mechanism of confined water loss in unconsolidated layer to surface subsidence was analyzed. The results show that consolidation settlement of soil can be appeared due to water loss no matter with pressure or not, which is also the reason for consolidation and compression deformation of aquifer. Under the same conditions, the deformation of soil with fine particle size is larger than that of soil with coarse particle size. Related Articles | Metrics

Select

Roof collapse laws and reducing-span support technology in long-span roadway LI Chong，CAO Yue，CHENG Zhengmin，XU Jinhai，CHEN Liang Journal of Mining & Safety Engineering    2015, 32 (6): 978-983.   Abstract （989）      PDF（pc） （539KB）（1454）       Knowledge map    Save In response to the support problem under high stress in long-span roadway, taking the 7801 open-off cut in Wuyang mine as the engineering case, the microfracture development, stress distribution and deformation, failure and collapse laws have been researched in surrounding rock of long-span roadway under different side pressure coefficient and buried depths. The reducing-span support technology consisting of “reasonable section shape of secondary tunneling, bolt-mesh-cable, steel strip and hydraulic single prop” has been put forward. In the meanwhile, the long-span support parameters of open-off cut have been improved. The research shows that the original support scheme can not effectively control the deformation of roadway surrounding rock when the buried depth of 7801 open-off cut is more than 600 m; while the new reducing-span support technology can effectively control the deformation of surrounding rock, when the maximum for the roof-to-floor convergence, rib-to-rib convergence, roof separation and working resistance of single prop all in control are 55.5 mm，25.1 mm，24.8 mm and 12.52 MPa respectively. The researches effectively solve the support problem of 7801 open-off cut in Wuyang mine and provide reference for support design of long-span roadway. Related Articles | Metrics