煤系岩石损伤破坏扰动效应试验研究  

Test study of the perturbation effect of coal measures rocks damage failure

作　　者：宋大钊[1] 王恩元[1] 李楠[1] 李忠辉[1] 徐文全[1] 

机构地区：[1]中国矿业大学安全工程学院煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《中国矿业大学学报》2011年第4期530-535,共6页Journal of China University of Mining & Technology

基　　金：教育部新世纪优秀人才支持计划(NCET-06-0477);国家自然科学青年基金项目(50904067;40904028);江苏省"333高层次人才培养工程"

摘　　要：利用建立的煤岩体分级加载扰动试验系统，进行了煤系岩石典型单轴压缩实验、无扰动分级加载试验，以及分别施加不同速率及幅度的扰动载荷的分级加载试验，同步采集声发射（AE）信号，并利用加卸载响应比理论对AE信号进行分析．结果表明，扰动载荷能够使岩石的抗压强度显著降低，施加扰动载荷条件下9个岩样单轴抗压强度降低了20～60kN（约为单轴极限抗压强度的10％～25％）；扰动速率的变化（由650N／s增至1kN／s）较载荷大小的变化（由2．5kN增至5kN）对岩样强度影响明显；AE能量与加载路径对应良好，其加卸载响应比随载荷水平的增加存在先减小后增大的趋势．An existing coal and rock step-load perturbation test system was used to carry out typical uniaxial compression tests, non-perturbation step-load tests, and step-load tests with different perturbation rates and ranges on coal rocks. During the tests, AE signals were col- lected and analyzed using loading-unloading response ratio （LURR） theory. The results show that the compressive strength of the rock decreased dramatically under the conditions of per- turbed loads. Nine samples exhibited a decrease in compressive strength of 20--60 kN （about 10~//00 to 250//00 of the ultimate compression strength）. Compared to the load change （from 2.5 kN up to 5 kN）, the increase in perturbation rate （from 650 N/s up to 1 kN/s） has a much more obvious influence on the measured rock strength. The AE energy corresponds well with the load route~ the loading-unloading response ratio first decreased and then increased with an increase in load level.

关 键 词：煤系岩石 损伤破坏 扰动效应 加卸载响应比 

分 类 号：TD76[矿业工程—矿井通风与安全]