张军，温国惠, 孙兆冰,等.高应力下煤样变形及能量演化特性试验研究[J].河南理工大学学报（自然科学版）,2022,41(6):1-7.

ZHANG J, WEN G H, SUN Z B, et al.Experimental study on deformation and energy evolution characteristics of coal samples under high stress[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(6):1-7.

高应力下煤样变形及能量演化特性试验研究

张军1,2, 温国惠2, 孙兆冰2, 朱建平2, 董润泽2, 李晓辉2, 史振2, 孟庆彬3, 孙稳3, 陈彦龙3

1.中国矿业大学 矿业工程学院，江苏 徐州  221116；2.内蒙古双欣矿业有限公司，内蒙古 鄂尔多斯  017000；3.中国矿业大学 深部岩土力学与地下工程国家重点实验室，江苏 徐州  221116

摘要:开展高应力下煤岩物理力学特性研究对于深部煤炭资源安全开采具有重要意义，采用MTS 815岩石力学试验系统开展深部煤样的单/三轴压缩试验，分析高应力下煤样变形和强度特征以及能量演化特性。结果表明：应力峰后受载煤样易发生脆性破坏，单轴和低围压下为剪张复合型破坏，高围压下为剪切破坏；围压效应明显，煤样的峰值应力与弹性模量随围压提高而增大；低应力下煤样应力峰前产生了扩容，高应力下煤样在屈服后体积持续收缩，至贯穿断裂面时才产生扩容；煤样吸收部分试验机对其所做的功，以弹性变形能形式储存在内部，当煤样内部结构和应力状态发生改变时，以损伤能、塑性能等形式释放能量；高围压提高了煤样吸收能量的能力，峰前阶段以储存弹性变形能为主，峰后阶段以释放变形能为主。

关键词:高应力;三轴压缩;变形特征;强度特征;能量演化

doi:10.16186/j.cnki.1673-9787.2021060015

基金项目:国家自然科学基金资助项目（52074268）

收稿日期:2021/06/07

修回日期:2021/09/03

出版日期:2022/11/25

Experimental study on deformation and energy evolution characteristics of coal samples under high stress

ZHANG Jun1,2, WEN Guohui2, SUN Zhaobing2, ZHU Jianping2, DONG Runze2, LI Xiaohui2, SHI Zhen2, MENG Qingbin3, SUN Wen3, CHEN Yanlong3

1.School of Mines，China University of Mining and Technology，Xuzhou  221116，Jiangsu，China；2.Inner Mongolia Shuangxin Coal Mine Co.，Ltd.，Ordos  017000，Inner Mongolia，China；3.State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou  221116，Jiangsu，China

Abstract:Physical and mechanical properties study of coal and rock has great significance for the safe mining in deep underground mines.The uniaxial and triaxial compression tests of deep coal samples were carried out using the MTS 815 rock mechanics test system，and the deformation，strength and energy evolution characteristics of the coal samples under high stress were analyzed.The results indicated that brittle failure occurs easily when the loaded coal got post-peak stage.Shear-tension combined failure occured under uniaxial and low confining pressure while shear failure occured under high confining pressure.The effect of confining pressure was obvious，and the peak stress and elastic modulus of coal samples increased with the elevation of confining pressure.Under low stress，the coal sample had an expansion before the peak.Under high stress，the coal sample continued to shrink in volume after yielding and expansion occured when it penetrated the fracture surface.The coal sample absorbed part of the work done by the testing machine and stored it in the form of elastic deformation energy.When the internal structure and stress state of coal sample were changed，energy was dissipated in the form of damage energy and plastic energy.The high confining pressure improved the energy absorption capacity of the coal sample，and the elastic deformation energy was dominant in the pre-peak stage，while the dissipative deformation energy was dominant in the post-peak stage.

Key words:high stress;triaxial compression;deformation characteristic;strength characteristic;energy evolution

 001_2021060015_张军_H.pdf