高速公路软土探测高密度电法正演模拟分析及应用

Forward modeling analysis and application of high density resistivity survey in highway soft soil exploration

本文首先定性分析了高密度电法常用装置特性,然后根据软土层厚度探测精度的需要,提出基于钎探或槽探标点校正视深度方法,并基于res2dmod软件正演模拟了温纳α装置、温纳β装置、温纳γ装置、施龙贝格装置的软土层厚度探测地电模型,并说明了施龙贝格装置是最适合实际软土厚度及空间分布探测的装置类型。最后,基于夏蓉高速公路汝城至郴州段第15合同段的K71+520～K71+740m段实测资料,验证了基于钎探或槽探标点视深度校正法和使用施龙贝格装置的优越性。

A qualitative analysis is given for the character of common devices using in high density resistivity method firstly, then according to the detective accuracy requirement of soft clay, the apparent depth correction method based on light dynamic probing or trial trenching is presented. The geoelectrical model of soft clay depth detection by Wenner alpha, beta and gamma arrays, Schlumberger array are simulated by res2dmod software. Schlumberger array is proved to be the best for the thickness and distribution detection of soft clay. Upon the monitoring data in the section from KT1 ＋520m to K71 ＋740m between Rucheng and Chenzhou in the No. 15 contract section of the Xiamen Chengdu highway, the superiority of apparent depth correction method based on light dynamic probing or trial trenching and Schlumberger array is confirmed.