三轴循环加卸载作用下煤样变形及强度特征分析

采矿与安全工程学报 ›› 2014, Vol. 31 ›› Issue (3): 456-461.

三轴循环加卸载作用下煤样变形及强度特征分析

河南理工大学能源科学与工程学院，河南焦作 454000

出版日期:2014-05-15 发布日期:2014-05-20
作者简介:苏承东(1961-)，男，陕西省佛坪县人，教授级高工，从事采矿工程方面的研究。 E-mail：sucd@hpu.edu.cn Tel：0391-3986261
基金资助:
国家自然科学基金项目(51074065)；国家重点基础研究发展计划(973)项目(2012CB723103)

Analysis of deformation and strength characteristics of coal samples under the triaxial cyclic loading and unloading stress path

Online:2014-05-15 Published:2014-05-20

摘要/Abstract

摘要： 利用RMT-150B岩石力学试验机对煤样进行三轴循环加卸载试验，对三轴循环加卸载条件下煤样的变形及强度特征进行分析。结果表明：在三轴循环加载过程煤样的变形表现出明显记忆性，循环加载过程的应力-应变外包络线与连续加载的应力-应变曲线相吻合。在煤样屈服前进行加卸载，加载时弹性模量始终低于卸载时的弹性模量，且随加卸载次数的增加，加卸载时的弹性模量均有小幅增加，过峰值后弹性模量与峰值前弹性模量相比有所减小，但仍高于第1加载的弹性模量。三轴压缩条件下煤样的峰值强度、残余强度与围压成正比，符合Coulomb强度准则。峰值强度、残余强度与围压回归得到的摩擦系数大致相当，黏聚力则减低54.4%。

关键词: 岩石力学, 三轴压缩, 循环加载, 变形特征, 强度特征

Abstract: The triaxial cyclic loading and unloading is conducted on the coal sample through RMT-150B rock mechanics testing system. The deformation and strength characteristics of the coal samples during the tests are analyzed. The results show that during the tri-axial cyclic loading the coal sample deformation shows distinct memory and good fitting in stress-strain curve between the cyclic loading and the continuous loading. For loading and unloading prior to yield, the elastic modulus of loading procedure is always lower than the elastic modulus of unloading procedure. And the elastic modulus increased slightly with the frequency. The elastic modulus of unloading procedure after peak value is lower than that before peak value; however, the elastic modulus is still higher than that of first loading procedure. The peak strength and residual strength are proportional to the confining pressure during triaxial compressive test, which is consistent with the Coulomb strength criterion. The friction factor obtained from the regression analyses of the peak strength, residual strength and confining pressure are roughly equal and the cohesion is reduced by 54.4%.

Key words: rock mechanics, triaxial compression, cyclic loading, deformation characteristics, strength characteristics

苏承东, 熊祖强, 翟新献, 顾明. 三轴循环加卸载作用下煤样变形及强度特征分析[J]. 采矿与安全工程学报, 2014, 31(3): 456-461.

SU Chengdong, XIONG Zuqiang, ZHAI Xinxian, GU Ming. Analysis of deformation and strength characteristics of coal samples under the triaxial cyclic loading and unloading stress path[J]. Journal of Mining & Safety Engineering, 2014, 31(3): 456-461.

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