非贯通节理花岗岩剪切断裂力学特性及声发射特征研究  

Shear fracture mechanical properties and acoustic emission characteristics of discontinuous jointed granite

作　　者：王刚 宋磊博[1,3] 刘夕奇 包春燕 吝曼卿 刘广建[1,3] WANG Gang;SONG Lei-bo;LIU Xi-qi;BAO Chun-yan;LIN Man-qing;LIU Guang-jian(School of Civil Engineering,Shaoxing University,Shaoxing,Zhejiang 312000,China;School of Civil Engineering,Wuhan University,Wuhan,Hubei 430070,China;Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province,Shaoxing University,Shaoxing,Zhejiang 312000,China;School of Resources and Safety Engineering,Wuhan Institute of Technology,Wuhan,Hubei 430070,China)

机构地区：[1]绍兴文理学院土木工程学院,浙江绍兴312000 [2]武汉大学土木建筑工程学院,湖北武汉430070 [3]绍兴文理学院浙江省岩石力学与地质灾害重点实验室,浙江绍兴312000 [4]武汉工程大学资源与安全工程学院,湖北武汉430070

出　　处：《岩土力学》2022年第6期1533-1545,共13页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.42002275,No.51504167);浙江省自然科学基金(No.LQ21D020001);中国博士后科学基金(No.2021M692319);浙江省山体地质灾害防治协同创新中心开放研究基金(No.PCMGH-2021-03)。

摘　　要：为探究节理岩体在压剪复合作用下的断裂力学行为与破坏机制,采用完整及非贯通节理花岗岩开展了剪切试验,从宏观力学特性、声发射信号特征、颗粒流细观演化规律等多角度进行解析,并提出了一种利用声发射信号特征及其关键信息点预判花岗岩剪切破坏的方法。研究结果表明:节理破坏了岩石完整性,降低了岩石的剪切刚度和峰值剪切强度;此外,节理的存在会影响裂纹的扩展路径和破坏模式,且这种影响会随着法向应力的增加而削弱。法向应力和节理对声发射特征点影响显著,声发射信号的缓慢增长及b值的持续下降可作为岩石剪切破坏的前兆特征;利用声发射信号特征及其关键信息点可以有效预判花岗岩的剪切失稳破坏过程。该研究成果为节理岩体剪切破坏机制分析及其稳定性预测提供了一定参考。To investigate the fracture mechanical behavior and failure mechanism of jointed rock mass under compression and shear load,shear tests were carried out on intact and discontinuous jointed granite.The macroscopic mechanical properties,acoustic emission signal characteristics and mesoscopic evolution law by particle flow simulation were analyzed through the experiment.A method predicting shear failure of granite was proposed by using the acoustic emission signal characteristics and its key information points.The results show that the rock integrity is damaged by the joint,and the shear modulus and peak shear strength of the rock are reduced.In addition,the existence of joints will affect the propagation path and failure mode of cracks,and the influence will be weakened with the increase of normal stress.The normal stress and joints have significant effects on the acoustic emission characteristic points.The slow growth of acoustic emission signal and the continuous decline of b value can be used as the precursor characteristics of rock shear failure.The acoustic emission signal characteristics and its key information points can be used to effectively predict the shear failure process of granite.The research results provide a reference for the shear failure mechanism analysis and stability prediction of jointed rock mass.

关 键 词：岩石力学 非贯通性节理 花岗岩 声发射特征 破坏机制 

分 类 号：TU45[建筑科学—岩土工程]