基于声发射RA-AF值岩石破裂细观裂纹动态演化特征试验研究  

Experimental study on dynamic evolution characteristics of meso-cracks in rock fracture based on acoustic emission RA-AF value

作　　者：李江哲 南博文 Li Jiangzhe;Nan Bowen(College of Water Conservancy and Hydropower,Hebei University of Engineering,Handan 056038,China;Hebei Key Laboratory of Intelligent Water Conservancy,Handan 056038,China)

机构地区：[1]河北工程大学水利水电学院,邯郸056038 [2]河北省智慧水利重点实验室,邯郸056038

出　　处：《吉林水利》2023年第11期1-6,共6页Jilin Water Resources

摘　　要：为探究岩石破裂过程中演化机制及裂纹类型,通过单轴加载全过程搭配声发射监测,得到岩石破坏宏观力学信息和声发射特征参数,研究了三种岩样破坏过程中细观演化特征及破裂类型。结果表明:绢英母石英岩以剪切破裂为主,绿泥石石英片岩以张拉破裂为主,黑云母石英片岩为拉剪复合型破裂形式。拟合能级震级曲线得到能量和振幅的强度特征关系,将能级代替裂纹强度做进一步细观演化分析,定义能级0~1.0级为低等裂纹强度,1.0~2.0级为中等裂纹强度,2.0级以上为高等裂纹强度,三种岩样的细观裂纹演化过程与宏观结果表现一致。提出绢英母石英岩能级2.0级以上“高RA低AF”和绿泥石石英片岩2级以上“高AF低RA”作为岩样破裂前兆预测条件。ln order to explore the evolution mechanism and crack type in the process of rock failure,the macroscopic mechanical information and acoustic emission characteristic parameters of rock failure were obtained by acoustic emission monitoring in the whole process of uniaxial loading,and the meso-evolution characteristics and fracture types of three rock samples in the process of failure were studied.The results show that the sericite quartzite is dominated by shear fracture,the chlorite quartz schist is dominated by tensile fracture,and the biotite quartz schist is in the form of tensile-shear composite fracture.The strength characteristic relationship between energy and amplitude is obtained by fitting the energy level magnitude curve.The energy level is used to replace the crack strength for further meso-evolution analysis.The energy level of 0~1.0 is defined as the low crack strength,1.0~2.0 is defined as the medium crack strength,and that higher than 2.0 is defined as the high crack strength.The meso-crack evolution process of the three rock samples is obtained,which is consistent with the macroscopic results.It is proposed that the"high RA and low AF"of phyllic quartzite with energy level above grade 2 and the"high AF and low RA"of chlorite quartz schist with energy level above grade 2 can be used as the precursor prediction conditions for rock sample rupture.

关 键 词：细观演化 破裂类型 声发射 RA-AF 

分 类 号：TU45[建筑科学—岩土工程] TP18[建筑科学—土工工程]