岩石脆性临界破坏的声发射特征分析  

Analysis of Acoustic Emission Characteristics of Critical Rock Brittle Failure

作　　者：袁永才[1] 刘善伟[1] 柳尚 胡杰[1] 

机构地区：[1]山东大学岩土与结构工程研究中心,山东济南250061

出　　处：《湘潭大学自然科学学报》2016年第2期16-22,共7页Natural Science Journal of Xiangtan University

基　　金：国家重点基础研究计划(973计划)(2013CB036000);国家自然科学基金重点项目(51139004)

摘　　要：根据岩石变形破坏过程中应力-应变和声发射事件数-应变曲线所表征的声发射信息特征,利用重整化群理论,研究了岩石破裂过程中声发射信息与加载过程的相关性.研究表明：声发射特征参数蕴含丰富的损伤渐进破坏前兆信息,岩石变形破坏前声发射特征参数在变形破坏阶段会有明显的＂相对平静期＂,特别是当应力水平达到70%~80%之后.声发射信息出现的＂相对平静期＂可以作为判识岩石破裂的参照信息;岩石破裂的视电阻率识别值和声发射特征识别值对应的应力水平相近,比波速特征识别值同步性好,敏感程度高.通过试验分析与理论研究,验证了将声发射特征信息用于表征岩石破裂前兆信息的准确性.This paper studies the relationship between acoustic emission characteristics and rock brittlefailure during the whole process of compression,and analyses the testing data of the stress-strain curve andthe acoustic emission-stress curve based on renormalization group theory. This study shows that, acousticemission characteristic parameters contain a large amount of information of rock damage and fracture. Aquiet period of acoustic emission appears before rock failure, especially when the stress level reaches to70% ？80% . The quiet period of acoustic emission is the reference of rock brittle failure. The identificationvalues of apparent resistivity and acoustic emission characteristics are sim ilar and the wave velocity characteristicshave poor synchronicity and less sensitive. The accuracy of acoustic emission characteristics used tocharacterize the precursor characteristic of rock fracture is verified based on the experimental analysis andtheoretical study.

关 键 词：声发射 脆性破坏 应力比值 前兆信息 

分 类 号：TD315[矿业工程—矿井建设]