城郊矿煤样冲击倾向性指数的试验研究  

EXPERIMENTAL RESEARCH ON BURSTING LIABILITY INDEX OF COAL SAMPLES OF CHENGJIAO COAL MINE

作　　者：苏承东[1] 袁瑞甫[1] 翟新献[1] 

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454010

出　　处：《岩石力学与工程学报》2013年第S2期3696-3704,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51074065);国家重点基础研究发展计划(973)项目(2012CB723103)

摘　　要：利用RMT–150B伺服试验机对城郊矿煤样进行冲击倾向性试验,试验结果表明:测定冲击倾向性指数时煤样峰后变形特征与加载控制方式相关,测定动态破坏时间采用应力控制方式,冲击能量指数则采用应变控制方式;煤样的抗压强度与弹性模量、冲击能量指数、弹性能量指数和剩余能量指数呈正相关,而与动态破坏时间呈负相关,表明煤样抗压强度越高时发生冲击地压的危险程度越大;煤样的冲击能量指数与弹性能量指数,弹性能量指数与剩余能量指数均具有良好的正相关性;动态破坏时间与冲击能量指数具有呈良好负相关;剩余能量指标和弹性模量能否作为评判煤层冲击性等级划分有待进一步研究;城郊矿二2煤层煤样的动态破坏时间为306 ms、弹性能量指数为5.91、冲击能量指数为2.48、单轴抗压强度为8.86 MPa,依据规程模糊综合法评判二2煤层属于弱冲击类。Experiments on bursting liability of coal sample of Chengjiao coal mine were carried out by the RMT-150B servo-control testing machine. The test results indicate that the deformation characteristics after post-peak stage is related to the way of load control. The stress control method should be employed when testing dynamic time of failure and the strain control method should be used when testing burst energy index. The compression strength has well positive correlation with elasticity module,burst energy index,elasticity energy index and residual energy index but has negative correlation with dynamic time to failure,which indicates that the higher the compression strength of coal sample,the more dangerous the rock burst. The burst energy index of coal samples has well positive correlation with elasticity energy index,so does the relation between elasticity energy index and residual energy index. The dynamic time to failure has well negative correlation with burst energy index. And whether the residual energy index and elasticity module can be the criterion of coal seam classification of bursting liability needs further study. Finally,based on experimental data that the dynamic time to failure,elasticity energy index,burst energy index and uniaxial compression strength of the coal samples is 306 ms,5.91,2.48 and 8.86 MPa respectively,it can be concluded by the fuzzy comprehensive method that the Two2 coal seam of Chengjiao mine belongs to the type of weak bursting liability.

关 键 词：岩石力学 冲击倾向性 冲击地压 单轴压缩 弹性能量 能量耗散 

分 类 号：TD32[矿业工程—矿井建设]