基于真三轴卸载试验不同倾角组合煤岩力学特性研究  

Mechanical properties of coal and rock with different dip angles based on true triaxial unloading test

作　　者：彭岩岩 郦亦凡[1,2] 余虎 韩攀嵘 朱淳 何满潮 PENG Yanyan;LI Yifan;YU Hu;HAN Panrong;ZHU Chun;HE Manchao(College of Civil Engineering,Shaoxing University,Shaoxing 312000,China;Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province,Shaoxing University,Shaoxing 312000,China;School of Earth Sciences and Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]绍兴文理学院土木工程学院,浙江绍兴312000 [2]绍兴文理学院浙江省岩石力学与地质灾害重点实验室,浙江绍兴312000 [3]河海大学地球科学与工程学院,江苏南京211100

出　　处：《采矿与岩层控制工程学报》2024年第2期1-10,共10页Journal of Mining and Strata Control Engineering

基　　金：国家自然科学基金资助项目(42277154)。

摘　　要：为深入研究煤炭开采过程中顶板结构面倾角对煤岩力学特性的影响,通过自主研发的地声过程模拟试验系统,开展不同结构面倾角条件下组合煤岩真三轴加卸载试验,并利用声发射探测系统进行监测。研究结果表明:随着结构面倾角的增大,试样的破坏强度逐步下降,裂隙发展也逐渐减弱,其破坏形态从张拉剪切破坏逐渐向剪切破坏转变,直至倾角达到40°时,试样整体发生滑移破坏;在卸载破坏前,倾角<30°的试样发生充分的塑性变形,其承载力得到充分发挥,而倾角≥30°的试样达到临界破坏极限时迅速破坏,出现部分或完全滑移破坏;声发射信号集中于卸载破坏阶段,试样的结构面倾角越大,声发射累计计数越少,当倾角达到40°时发生滑移破坏,最大振铃计数大幅下降,对其累计计数略有影响。研究成果可为深入认识顶板结构面倾角引起的卸载破坏机制及矿山安全开采提供参考。To delve into the impact of roof structural plane inclination angles on the mechanical properties of coal and rock during coal extraction,this study employed a bespoke acoustic process simulation testing system for conducting true triaxial loading and unloading tests on combined coal and rock specimens under varying structur-al plane inclination angles,with an acoustic emission detection system for monitoring.Findings indicate that with increasing inclination angles,the specimens'failure strength diminishes and crack development weakens.The failure mode shifts from tensile shear to shear failure,culminating in sliding failure at an inclination angle of 40°.Specimens with an inclination angle under 30°experienced ample plastic deformation,optimizing their load-bearing capacity,whereas those with inclination angles of 30°or more encountered rapid failure upon reaching critical failure thresholds,leading to partial or complete sliding failure.Acoustic emission signals were predomi-nantly observed during the unloading failure phase,with fewer cumulative counts recorded for specimens at high-er inclination angles.At a 40°inclination,sliding failure significantly reduced the maximum ringing count,mar-ginally affecting the cumulative count.These insights provide valuable perspectives on the unloading failure mechanisms triggered by the inclination angle of the roof structural plane,contributing to the advancement of safe mining practices.

关 键 词：组合煤岩 真三轴试验 结构面倾角 声发射 

分 类 号：TD32[矿业工程—矿井建设]