石灰岩声发射特性的试验研究
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摘要
采用SYB-4声发射仪和岩石声发射参数动态测试系统,对广西高峰石灰岩进行了单轴压缩条件下的声发射试验,研究了石灰岩在单轴加载过程中声发射活动随时间和岩样应力、变形等变化的内在规律,在此基础上分析了石灰岩的破坏机理。试验研究表明:除加载初期外,石灰岩声发射活动与试样体积变形间有较好的关联性,岩样中微裂纹形成和原有裂纹扩展是造成岩石声发射活动与体积变化的主要原因。因此,采用声发射技术可对矿山采场矿岩体变形稳定性进行监测和评价。
With the acoustic emission(AE) instrument of SYB-4 and the help of the rock acoustic parameter dynamic testing system,the acoustic emission characteristics in the process of uniaxial compression test of Gaofeng limestone in Guangxi Province is studied.Based on the experimentation data collected from limestone's uniaxial compression,the principle of the AE and the breakage mechanism of the limestone is analyzed.The test study shows that: out of the initial stages the relationship between the acoustic emission and the displacement of limestone is in evidence,which caused by forming of micro-fractures and expending of original fractures,and the relationship can be used to monitor the stability of mine rock mass.
With the acoustic emission(AE) instrument of SYB-4 and the help of the rock acoustic parameter dynamic testing system,the acoustic emission characteristics in the process of uniaxial compression test of Gaofeng limestone in Guangxi Province is studied.Based on the experimentation data collected from limestone's uniaxial compression,the principle of the AE and the breakage mechanism of the limestone is analyzed.The test study shows that: out of the initial stages the relationship between the acoustic emission and the displacement of limestone is in evidence,which caused by forming of micro-fractures and expending of original fractures,and the relationship can be used to monitor the stability of mine rock mass.
引文
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[2]Hocomb D J.General theory of the Kaiser effect[J].Int.J.RockMech.Sci.&Geomech Abstr.,1993,30(7):929-935.
[3]宋战平.岩土工程中的混沌、分形理论及其应用研究[D].昆明:昆明理工大学,2000.
[4]尹贤刚,李庶林.声发射技术在岩土工程中的应用[J].采矿技术,2002,4(2):39-42.
[5]秦四清,李造鼎,张倬元,等.岩石声发射技术概论[M].成都:西南交通大学出版社,1993.
[6]许昭永.单轴实验时的加载速度与声发射特征[J].地震研究,1985,8(6):702-705.
[7]王祖荫.声发射技术基础[M].济南:山东科学技术出版社,1989.
[8]袁振明.声发射技术及其应用[M].北京:机械工业出版社,1984.
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