冯攀飞, 刘旭东, 张文海,等.预留煤柱形状对煤矿工作面稳定性的影响研究[J].河南理工大学学报（自然科学版）,2023,42(6):19-26.

FENG P F, LIU X D, ZHANG W H, et al.Study on the influence of reserved coal pillar shape on the stability of coal mine working face[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(6):19-26.

预留煤柱形状对煤矿工作面稳定性的影响研究

冯攀飞1, 刘旭东1, 张文海2, 潘鹏志2, 朱红伟1, 王兆丰2

1.国家能源集团 新疆能源有限责任公司，新疆 乌鲁木齐  830000;2.中国科学院 武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北 武汉 430071

摘要:煤矿开采过程中常需预留煤柱支撑上部岩体，预留煤柱的径高比和大小不尽相同，对工作面的稳定性影响较大。通过对煤体及煤岩组合体进行不同径高比下的单轴压缩数值模拟试验，分析煤体和煤岩组合体的力学性质及破裂过程，研究不同径高比预留煤柱对工作面稳定性的影响。结果表明：（1）随着径高比逐渐增大，煤体和煤岩组合体峰值强度同步增大，煤体先由脆性向延性转变，随后又由延性向脆性转变，煤岩组合体也由脆性破坏向延性破坏转变，延性逐渐降低；（2）随着径高比逐渐增大，煤体及煤岩组合体主要以劈裂破坏为主，且引起煤体裂纹破坏的扩展方向动态变化，煤岩组合体随煤体的劈裂破坏而破坏；（3）随着径高比逐渐增大，煤岩组合体与煤体的峰值强度差值也变大，煤体峰值轴向应变随着径高比的增大无明显变化，煤岩组合体峰值轴向应变呈一定程度增大，且当D/L=0.8时，峰值轴向应变较高。

关键词:预留煤柱;煤岩组合体;单轴压缩;径高比

doi:10.16186/j.cnki.1673-9787.2022110019

基金项目:国家自然科学基金资助项目（52125903）

收稿日期:2022/11/09

修回日期:2023/03/01

出版日期:2023/11/25

Study on the influence of reserved coal pillar shape on the stability of coal mine working face

FENG Panfei1, LIU Xudong1, ZHANG Wenhai2, PAN Pengzhi2, ZHU Hongwei1, WANG Zhaofeng2

1.State Energy Group Xinjiang Energy Co.，Ltd.，Urumqi  830000，Xinjiang，China;2.State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan  430071，Hubei，China

Abstract:In the process of coal mining，it is often necessary to reserve coal pillars as load-bearing columns to support the gravity of the upper rock mass.Due to the different width-height ratios of the reserved coal pillars on site，it has a great impact on the stability of the coal mine working face.Through uniaxial compression numerical tests conducted under different diametral-height ratios of coal rocks and their assemblages，the mechanical properties and fracture process of coal rock and its mass under different diameter-height ratios were analyzed to investigate the influence of reserved coal pillars and their mass on the stability of the working face.The results showed that：（1）As the ratio of diameter to height increased gradually，the peak strength of coal rock and its mass increased synchronously.The coal rock changed from brittle to ductile，and then from ductile to brittle，and the mass rock changed from brittle failure to ductile failure，with the ductility of the mass decreasing gradually with the continuous increase of the ratio of diameter to height.（2）With the gradual increase of the diameter to height ratio，the coal rock and its mass were mainly subjected to split failure，and the expansion direction of the crack failure is constantly changing dynamically，and the basic coal rock of the mass being broken by splitting failure.（3）The difference in peak strength between mass mass and coal rock was larger with the gradual increase of diameter to height ratio.The peak axial strain of coal rock showed no significant change with the increase of diameter to height ratio.The general trend of peak axial strain of mass mass increased with the increase of diameter to height ratio to a certain extent，and the peak axial strain of mass mass was higher when D/L=0.8.

Key words:reserved coal pillar;coal rock mass;uniaxial compression;diameter-height ratio

003_2022110019_冯攀飞_L.pdf