冲击混响法溶洞探测初步试验  

Primary test of cavern detection by impact reverberation method

作　　者：赵亚军[1] 阎玉舜[1] 林维正[1] 

机构地区：[1]同济大学声学研究所,上海200092

出　　处：《声学技术》2008年第3期473-477,共5页Technical Acoustics

基　　金：上海市科协发展基金资助

摘　　要：提供一种区别于通常地矿应用的测声时差的新的溶洞声学测试方法-冲击混响法。通过有无溶洞两个模型的声学试验,对测量数据进行时域分析和时频分析,得到混响衰减系数和混响持续时间两个参数,结果表明:两个模型的混响衰减系数和混响持续时间都存在明显差异,空心模型的混响衰减系数较实心模型小,而混响持续时间则比实心模型大。因而为方便快捷地判断有无溶洞的冲击混响法提供了试验依据。A new cavern detection method of measuring impact reverberation which is different from the geological method of measuring interval transit time is provided. Through the experiments of two acoustic models, one is hollow and the other is solid, the measured data are analyzed in time and timefrequency domains. Two parameters are given as reverberation attenuation coefficient and reverberation duration. The results show that, the reverberation attenuation coefficients and reverberation durations of two models are obviously different from each other. The reverberation attenuation coefficient of the hollow model is smaller than that of the solid one, and the reverberation duration of the hollow model is greater than that of the solid one. This provides an experimental basis for the impact reverberation method which can easily and quickly to judge whether a cavern exists.

关 键 词：溶洞 声学探测 混响衰减系数 混响持续时间 

分 类 号：TB529[理学—物理]