声发射和变形场联合监测试验研究  

Experimental study on combined acoustic emission and deformation field monitoring

作　　者：王晓雷 蒋鹏程 闫顺玺 詹思博 皇甫润 王尚政 WANG Xiaolei;JIANG Pengcheng;YAN Shunxi;ZHAN Sibo;HUANGFU Run;WANG Shangzheng(College of Mining Engineering,North China University of Science and Technology,Tangshan 063210,China;Yisheng Innovation Education Base,North China University of Science and Technology,Tangshan 063210,China)

机构地区：[1]华北理工大学矿业工程学院,河北唐山063210 [2]华北理工大学以升创新教育基地,河北唐山063210

出　　处：《中国矿业》2021年第2期203-208,共6页China Mining Magazine

基　　金：国家自然科学基金重大项目资助(编号:51134005)。

摘　　要：为探究工程岩体在声发射和变形场联合监测下破裂失稳的特征,分析两者与岩石破裂失稳的内在联系,进行了片麻岩单轴压缩试验,提供一种更全面的预警方法。研究结果如下:声发射累计振铃计数和变形场应变均方差两个参数曲线启动点出现时间差距不大,预警点出现时间差距较大,总体上声发射比变形场更早监测到破裂信息;声发射累计振铃计数曲线和应变均方差曲线第一次以近竖直斜率大幅上升时即可预警,代表岩石即将破坏。声发射累计振铃计数曲线上升幅度占总体的20%~50%,平均占比34.65%,应变均方差曲线上升幅度占总体的25%~65%,平均占比41.15%;岩石破裂失稳预警,在时间上声发射比变形场更早监测到,在空间上变形场可实时监测岩石表面裂纹演化情况。将两种监测手段联合,能更全面了解工程岩体破裂情况,为实际工程岩体的稳定性控制及防治提供理论依据。The purpose of this paper is to explore the characteristics of fracture instability of engineering rock mass under combined acoustic emission and deformation field monitoring and analyze the internal relationship between them and rock fracture instability.In this paper,the uniaxial compression test of gneiss is carried out to provide a more comprehensive method for early warning.The results are as follows:there is little time difference between the start points of the acoustic emission cumulative ringing count and the strain mean square deviation of the deformation field,while there is a big time difference between the warning points.On the whole,the acoustic emission detects the rupture information earlier than the deformation field.The cumulative acoustic emission ringing count curve and strain mean square deviation curve can give warning when the near vertical slope rises sharply for the first time,indicating that the rock is about to collapse.The cumulative acoustic emission ringing count curve increased by 20%-50%,accounting for 34.65%on average,and the strain mean square deviation curve increased by 25%-65%,accounting for 41.15%on average.In terms of the early warning of rock fracture and instability,the temporal acoustic emission is earlier than the deformation field,but the deformation field can be used to observe the rock surface crack evolution in real time.By combining the two monitoring methods,the rupture of engineering rock mass can be understood more comprehensively,and the theoretical basis for stability control and prevention of engineering rock mass can be provided.

关 键 词：声发射 变形场 联合监测 预警 

分 类 号：TU457[建筑科学—岩土工程]