动载作用下多重扰动钻孔煤体破坏特征研究  

Study on coal failure characteristics of multiple disturbance boreholes under dynamic load

作　　者：欧阳振华 李文帅 刘洋 李春雷[3] 史庆稳 张宁博 OUYANG Zhenhua;LI Wenshuai;LIU Yang;LI Chunlei;SHI Qingwen;ZHANG Ningbo(School of Mine Safety,North China Institute of Science and Technology,Yanjiao 065201,China;College of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China;China Institute of Water Resources and Hydropower Research,Beijing 100048,China)

机构地区：[1]华北科技学院矿山安全学院,北京东燕郊065201 [2]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [3]中国水利水电科学研究院,北京100048

出　　处：《华北科技学院学报》2025年第2期1-8,共8页Journal of North China Institute of Science and Technology

基　　金：国家自然科学基金面上资助项目(52274120);河北省自然科学基金重点资助项目(E2024508004);中央高校基本科研业务费资助项目(3142018001)。

摘　　要：开采中的应力扰动会改变煤岩体的受力状态,引发冲击地压灾害发生。为探究多重扰动钻孔煤体损伤演化过程及破坏特征,制备含预制钻孔的大尺寸正方体类煤岩试样,开展准静态循环加卸载和动态加载试验,分析监测到的应力、应变以及声发射等信息。研究发现随着加载力和循环次数的增加,声发射振铃计数和耗散能密度快速累积,试样损伤程度增加,峰值强度降低。在相同动载条件作用下,不同损伤程度的试样表现出不同的破坏特征,说明不同加载条件造成的损伤对煤体破坏形式有决定性影响。Stress disturbances during mining operations can alter the stress state of coal-rock masses,potentially triggering rockburst disasters.To investigate the damage evolution process and failure characteristics of borehole coal masses under multiple disturbances,large-scale cubic coal-like specimens with prefabricated boreholes are prepared for quasi-static cyclic loading-unloading and dynamic loading tests.The experimental results revealed that with increasing loading forces and cycle numbers,rapid accumulations of acoustic emission(AE)ring-down counts and dissipated energy density were observed,accompanied by intensified specimen damage and reduced peak strength.Under identical dynamic loading conditions,specimens with varying damage degrees exhibited distinct failure characteristics,indicating that the damage induced by different loading conditions plays a decisive role in the failure modes of coal masses.

关 键 词：多重扰动 预制钻孔 冲击地压 破坏特征 损伤演化 

分 类 号：TD324[矿业工程—矿井建设]