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岩体的声发射特征试验研究
引用本文:李俊平,周创兵.岩体的声发射特征试验研究[J].岩土力学,2004,25(3):374-378.
作者姓名:李俊平  周创兵
作者单位:武汉大学 水利水电学院,湖北 武汉 430072
基金项目:自然科学基金重点项目(编号:50239070)
摘    要:在单轴压缩条件下,讨论了4种岩石的声发射特征;在静态胀裂剂作用下,讨论了岩体的声发射特征。研究表明,在低应力阶段,岩石几乎没有声发射活动,一般当强度达到80 %以上,即临近破坏时,声发射活动才显著增加;岩体破坏的声发射过程分为4个阶段,即初始区(Ⅰ)、剧烈区(Ⅱ)、下降区(Ⅲ)和沉寂区(Ⅳ);有的岩石的凯瑟效应不明显;岩石的声发射主频与岩石的强度有关,强度越高,主频也越高;随着应力的增加,岩石的声发射主频不会平移;应用1 kHz的探头,能满足工程岩体的稳定性分析和冒落预报的要求。

关 键 词:声发射  单轴压缩  静态涨裂  频谱分析
文章编号:1000-7598-(2004)03-0374-05
收稿时间:2003-08-25
修稿时间:2003年8月25日

Experimental research on acoustic emission characteristics of rock mass
LI Jun-ping,ZHOU Chuang-bing.Experimental research on acoustic emission characteristics of rock mass[J].Rock and Soil Mechanics,2004,25(3):374-378.
Authors:LI Jun-ping  ZHOU Chuang-bing
Institution:School of Water Resources and Hydropower, Wuhan University, Wuhan 430072, China
Abstract:The four kinds of rock’s acoustic emission(AE) characteristics are tested and analyzed under uniaxial compression. And under crushed statically by gesso and cement mixture, AE characteristics of rock-mass are studied. As results, at lower stress the rock seems to has no AE. In general, when stress arrives at 80 % of rock strength, and rock draws near breach, its AE just increases remarkably. And AE progress of rock breakage is divided into four phases, viz., beginning phase (Ⅰ), tempestuousness phase (Ⅱ), drop phase (Ⅲ) and dreariness phase (Ⅳ). And that Kaiser Effect of some rock is unobvious. Also dominant frequency of rock AE is related to its strength. The more its strength is big, the more the dominant frequency is big. And when the stress increases, the dominant frequency is not budged. In addition, the 1 kHz sensor is suitable to analyze stability of rock-mass and forecast its fall.
Keywords:acoustic emission (AE)  uniaxial compression  static crushability  spectrum analysis
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