点状不良地质体钻孔雷达响应特征 ——围岩及充填效应正演分析

›› 2012, Vol. 33 ›› Issue (4): 1191-1195.

点状不良地质体钻孔雷达响应特征 ——围岩及充填效应正演分析

钟声^{1, 2}，王川婴²，吴立新³，唐新建²，王清远¹

1. 四川大学建筑与环境学院，成都 610065；2. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071； 3. 东北大学测绘遥感与数字矿山研究所，沈阳 110004

收稿日期:2010-03-30 出版日期:2012-04-13 发布日期:2012-04-26
作者简介:钟声，男，1977年生，博士，讲师，主要从事岩土工程、地基与基础工程方面的研究工作。
基金资助:
岩土力学与工程国家重点实验室资助课题(No. Z012005)；教育部创新团队项目(No. IRT0640)。

Borehole radar response characteristics of point unfavorable geo-bodies： forward simulation of its surrounding rock and filling condition

ZHONG Sheng^{1, 2}，WANG Chuan-ying²，WU Li-xin³，TANG Xin-jian²，WANG Qing-yuan¹

1. School of Architecture & Environment, Sichuan University, Chengdu 610065, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 3. Institute of Geo-informatics & Digital Mine Research, Northeastern University, Shenyang 110004, China

Received:2010-03-30 Online:2012-04-13 Published:2012-04-26

摘要/Abstract

摘要： 钻孔地质雷达探测是一种有效获取高分辨率深部岩体信息的井中地球物理方法。针对钻孔地质雷达探测工作中常见的空洞、岩溶和地下埋藏物等点状不良地质体，利用时域有限差分数值模拟方法，对岩土体内点状不良地质体围岩介质和充填状况进行了雷达响应正演研究，分析了这些点状不良地质体围岩介质和充填状况对钻孔地质雷达反射信号的影响。研究结果表明，围岩与空洞内充填物的相对介电常数相对值，决定着雷达反射剖面信号的强弱对比，介电常数相对值较大时，更易确定目标地质体的前、后部界面位置，而低阻围岩的雷达波信号大部分被围岩介质吸收，通过单孔反射方法几乎不可能探测到空洞的存在。通过反射信号强度和正负相反射特性及其强弱变化，可以定性地判断空洞内填充物质的性质。

关键词: 钻孔地质雷达, 时域有限差分, 围岩介质, 充填状况, 点状不良地质体

Abstract: Borehole radar is a well geophysical method for obtaining the high-resolution information of deep underground environment. According to the common point unfavorable geo-bodies in borehole radar exploration, such as cavities, karst caves and buried objects, etc., the forward simulation of response of the tool to point unfavorable geo-bodies of different surrounding rock and filling condition is investigated with finite difference time domain (FDTD) method. The influence of surrounding rock and filling condition on response characteristics of borehole radar is analyzed. The results indicate that the relative value of dielectric constant of surrounding rock and filling substance affects the contrast of radar reflection profile, and when the relative value of dielectric constant increasing, it is easier to ascertain the subsurface media distribution. While high-conductivity surrounding rock can attenuate most of radar signal, it is almost impossible to detect the cavities with single borehole reflection method. According to the different borehole radar cross-sectiorn and its response characteristics, the filling condition in the cavities can be qualitatively distinguished.

Key words: borehole radar, finite difference time domain, surrounding rock, filling condition, point unfavorable geo-bodies

中图分类号:

P 583

钟声，王川婴，吴立新，唐新建，王清远. 点状不良地质体钻孔雷达响应特征 ——围岩及充填效应正演分析[J]. , 2012, 33(4): 1191-1195.

ZHONG Sheng ，WANG Chuan-ying ，WU Li-xin ，TANG Xin-jian ，WANG Qing-yuan. Borehole radar response characteristics of point unfavorable geo-bodies： forward simulation of its surrounding rock and filling condition[J]. , 2012, 33(4): 1191-1195.

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