厚煤层超高巷道裂隙拓展规律及围岩控制

采矿与安全工程学报 ›› 2014, Vol. 31 ›› Issue (5): 687-694.

厚煤层超高巷道裂隙拓展规律及围岩控制

1．河南理工大学土木工程学院，河南焦作 454000；2．中国矿业大学(北京)资源与安全工程学院，北京 100083； 3．煤科集团沈阳研究院有限公司，辽宁沈阳 110016；4．贵州大学喀斯特环境与地质灾害防治教育部重点实验室，贵州贵阳 550000；5．河南理工大学深部矿井建设重点学科开放实验室，河南焦作 454000

出版日期:2014-09-15 发布日期:2014-10-08
作者简介:许磊(1980—)，男，河南省焦作市人，博士研究生，从事矿山压力与岩层控制方面的研究。 E-mail：32246714@qq.com Tel：18611623304
基金资助:
国家自然科学基金项目(51234005)；国家重点基础研究发展计划(973)项目(2010CB226802)；中央高校基本科研业务费专项资金项目(2010YZ02)

Fracture principle and surrounding rock control of super-high roadway in thick coal seam

Online:2014-09-15 Published:2014-10-08

摘要/Abstract

摘要： 针对井下超高巷道围岩控制难题，选取某煤矿5205胶带运输巷超高段为研究对象，采用UDEC模拟了巷高3.5~8 m过程中围岩裂隙场的分布特征、拓展规律及相对演化趋势。结果表明：围岩裂隙场分为3个区，即裂隙贯通区、裂隙发育区和微裂隙区，均呈“半椭圆”状分布；顶、底、两帮裂隙三区深度随巷高增加而增加，加剧了顶、底板微裂隙区向裂隙发育区转化，裂隙发育区向裂隙贯通区转化，相反的，两帮微裂隙区向裂隙发育区转化和裂隙发育区向裂隙贯通区转化的趋势逐渐降低。由侧压系数1.0时不同巷高等应力轴比分析可知：顶板无效加固区高度与巷高呈负指数减小，两帮无效加固区宽度呈正指数增加。认为：锚杆可控制裂隙滑移，延缓围岩碎胀变形；帮斜拉锚索梁可锚固在肩角和底角无裂隙区，锚固基础可靠，且可挤压帮中部裂隙贯通区。基于此提出了高强高预紧力锚带网和帮斜拉锚索梁联合控制技术，超高巷道支护完成后10 d实现自稳，顶底板相对移近量104 mm，两帮相对移近量150 mm，顶板累计离层3.5 mm。

关键词: 厚煤顶, 超高, 巷道, 裂隙, 支护

Abstract: In response to the surrounding rock control problem of ultrahigh roadway, the ultrahigh segment of No.5205 belt transportation roadway in a mine has been selected as research object, the distribution characteristics, development law and relative evolution tendency of fracture field have been researched by UDEC numerical simulation within the height from 3.5 m to 8 m. Results show that surrounding rock fracture field has three areas: fracture transfixion area, fracture development area and microfracture area are all distributed as semi-ellipse. With the height increasing, three fracture areas depth of roof, floor and two sides increases gradually. The transformation from the microfracture area to the fracture development area and from the fracture development area to the fracture transfixion area is strengthened in roof and floor. On the contrary, the transformation from the microfracture area to the fracture development area and from fracture development area to the fracture transfixion area is reduced gradually in the two sides. Equal-stress axial ratio with different height when side-pressure coefficient equals 1.0 is analyzed. The results show that floor void reinforced area height decreases as negative exponent and two sides void reinforced area thickness increases as positive exponent with the height increasing. It is believed that bolt can control fracture slip and delay surrounding rock bulking deformation; side diagonal cable and beam can be anchored to the no fracture region in the shoulder and floor. It has stable and reliable anchor foundation and can squeeze the fracture transfixion area in middle part of the side. Based on this, the combined support technology of high strength and high pre-stressing bolt net bar & diagonal cable and beam is proposed. Super-high roadway will reach self-stabilization after it was dig out after 10 days. Roof-to-floor relative convergence is 104 mm, with two sides relative convergence 150 mm and total roof separation 3.5 mm.

Key words: thick coal roof, super-high, roadway, fracture, support

许磊, 何富连, 王军, 王艳飞, 李博, 魏海霞. 厚煤层超高巷道裂隙拓展规律及围岩控制[J]. 采矿与安全工程学报, 2014, 31(5): 687-694.

XU Lei, HE Fulian, WANG Jun, WANG Yanfei, LI Bo, WEI Haixia. Fracture principle and surrounding rock control of super-high roadway in thick coal seam[J]. Journal of Mining & Safety Engineering, 2014, 31(5): 687-694.

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