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岩溶区不同含水率破碎围岩地质雷达波形特征研究

Keywords: 隧道工程,波形特征,后处理,破碎灰岩,地质雷达

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Abstract:

为研究岩溶区裂隙块状结构破碎灰岩在不同含水率时的地质雷达波形特征,以广西六寨至宜州高速公路40座公路隧道为依托,进行大量现场实测。对裂隙块状结构破碎灰岩的实测数据进行筛选,并基于被选数据,采用SIR-3000地质雷达RADAN后处理软件分析不同含水率情况下的线测、点测反射强弱定性特征,同时采用对MATLAB分析软件进行数据接口语言汇编的方法,研究不同含水率情况下回波中心频率值及其分布范围,结果表明当含水率分别小于26%、介于26%~42%和大于42%时,线测、点测反射强弱变化较大,回波中心频率以低频为主,分别在85,80MHz和53MHz附近波动,且分布范围依次减小,分别为21~105MHz,12.5~102MHz和11~77MHz。

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