岩溶区不同含水率破碎围岩地质雷达波形特征研究  

Study on Waveform Property of GPR for Broken Surrounding Rock with Different Water Contents in Karst Area

作　　者：温世儒[1] 杨晓华[1] 吴霞[2] 吴兴娇[1] 周亚[3] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]江西应用技术职业学院,江西赣州341000 [3]江苏省交通规划设计院股份有限公司,江苏南京210005

出　　处：《公路交通科技》2014年第11期103-107,115,共6页Journal of Highway and Transportation Research and Development

基　　金：广西壮族自治区科技攻关项目(桂科政10124006-10)

摘　　要：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。In order to study the waveform properties of GPR for broken limestone with fractured and blocky shape under different water contents in karst area, on the basis of 40 highway tunnels of Liuzhai-Yizhou expressway in Guangxi Zhuang Autonomous Region, a lot of field measurement is made. Choosing the raw data of broken limestone with fractured and blocky shape, and based on these data, the RADAN post- processing software of SIR-3000 GPR is adopted to analyze the qualitative reflection strength properties of line-scan and point-scan under different water contents, and the language assembly method of data interface of the MATLAB analysis software is applied to analyze the value and distribution range of the reflected wave central frequency under different water contents. The result shows that （ 1 ） when water content is less than 26% , between 26% and 42% , and more than 42% respectively, the reflection strengths of line-scan and point-scan changed greatly, and the central frequency of reflected wave is given priority to be low, which fluctuated in the vicinity of 85, 80, 53 MHz respectively, and the distribution range reduced in turn, which are 21 -105 MHz, 12.5 -102 MHz and 11 -77 MHz respectively.

关 键 词：隧道工程 波形特征 后处理 破碎灰岩 地质雷达 

分 类 号：U458.1[建筑科学—桥梁与隧道工程]