循环载荷作用下岩石多参量特征规律研究  

Experimental research on multi-parameter rules of rock under cyclic loading

作　　者：赵扬锋[1,2] 张超[1] 刘力强[2] 潘一山[1] 朱小景[1] 

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]中国地震局地震动力学国家重点实验室,北京100029

出　　处：《中国安全科学学报》2016年第5期105-111,共7页China Safety Science Journal

基　　金：国家自然科学基金资助(51274114;11172121);中国博士后基金特别资助(2014T70103);2013年辽宁省高等学校杰出青年学者成长计划(LJQ2013036)

摘　　要：为有效提取岩土工程在循环载荷作用下岩体失稳破坏的前兆信息,基于岩样在循环载荷作用下有声发射、微震和电荷等多参量信号的异常变化特性,用多参量综合监测设备,同时监测岩石在循环载荷作用下变形破裂过程中的多参量信号。结果表明:在岩石循环加卸载的各个阶段,当载荷低于前一阶段最大载荷时,各通道多参量信号都较弱;而当载荷超过前一阶段最大载荷时,多参量信号迅速增多、增强,即岩石多参量信号的阶段性特征能反映岩石破坏信息及载荷状态。因此,对比分析多参量信号可较好地获得岩石失稳破坏的前兆信息。In order to obtain the precursor information on rock mass unstable failure of geotechnical engineering under cyclic loading,according to the abnormal change features of acoustic emission,microseismic,charge and other multi-parameter signals rock specimens would produce under cyclic loading,multi-parameter comprehensive monitoring devices were used to monitor the multi-parameter signals simultaneously during the deformation and failure process of rock under cyclic loading. The results show that,in each cycle loading and unloading stage of rock,the multi-parameter signals of each channel are weaker when the load is lower than the maximum load in the preceding stage,that the multi-parameter signals of each channel increase and enhance rapidly,when the load exceeds the maximum load,that the stage characteristics of multi-parameter signals of rock can reflect the damage information and load state of rock,and that the precursory information on instability and failure of rock can be obtained better through a comparative analysis of multi-parameter signals.

关 键 词：循环加载 声发射 微震 电荷感应 试验研究 

分 类 号：X936[环境科学与工程—安全科学]