岩体爆破累积损伤效应的声波形态变化特征  

Variation characters of acoustic waveforms caused by rock mass blasting cumulative damage effects

作　　者：闫长斌[1] 王贵军[1] 张辉[1] 王泉伟[1] 徐国元[2] 

机构地区：[1]黄河勘测规划设计有限公司,河南郑州450003 [2]华南理工大学土木与交通学院,广东广州510641

出　　处：《合肥工业大学学报（自然科学版）》2009年第10期1481-1484,1489,共5页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(50l490272);国家"十一五"科技支撑计划资助项目(2006BAB04A06)

摘　　要：岩体爆破损伤特性除了影响声波速度外,还明显地引起声波形态特征的变化。文章基于在某地下工程围岩中多次爆破作用下岩体累积损伤效应的声波测试,对声波测试信号中的波形、振幅及波形相关性等信息随爆破次数增加的变化规律进行了分析。结果表明,随着爆破次数的增加,声波波形变得越来越不规则;声波振幅随爆破次数的增加呈明显下降趋势,反映了岩体由于爆破损伤累积、疲劳裂纹扩展引起的声波能量衰减;岩体声波波形相关性随着爆破次数的增加整体上呈下降趋势,相关系数为非线性下降曲线。The blasting damage characters of rock mass induce the variation of acoustic wave forms besides their influences on acoustic velocity. The paper presents the blasting of the surrounding rock of an underground project,and the acoustic measurement is carried out to research the cumulative damage effect of rock mass which is caused by blasting many a time. The variation laws of the acoustic waveform, amplitude and waveform correlation with the increasing of blasting times are analyzed Research results show that the acoustic waveforms become more and more irregular with the increasing of blasting times. The acoustic amplitude presents obvious downtrend, which illuminates the attenuation of acoustic waves because of blasting cumulative damage and fatigue crack extension. The correlation of acoustic waveforms descends generally, and the correlation coefficient produces a nonlinear falling curve.

关 键 词：岩石力学 爆破累积损伤效应 声波测试 波形 相关性 

分 类 号：TU235[建筑科学—建筑设计及理论] TU459.3