点状不良地质体钻孔雷达响应特征的形状效应正演分析

›› 2011, Vol. 32 ›› Issue (5): 1583-1588.

点状不良地质体钻孔雷达响应特征的形状效应正演分析

钟声^{1, 2}，王川婴²，吴立新³，吴育华⁴，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试验室，武汉 430071； 3.北京师范大学减灾与应急管理研究院，北京 100875；4.中国文化遗产研究院，北京 100029

收稿日期:2010-03-29 出版日期:2011-05-10 发布日期:2011-09-23
作者简介:钟声，男，1977年生，博士，讲师，主要从事研究岩土工程、地基与基础工程方面的研究
基金资助:
科技部973课题（No.2011CB707102）；教育部创新团队项目（No. IRT0640）

Borehole radar response characteristics of point unfavorable geo-bodies ——Forward simulation on its geometric effect

ZHONG Sheng^{1, 2}, WANG Chuan-ying², WU Li-xin³, WU Yu-hua⁴, 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. Academy of Disaster Reducton and Emergency Management, Beijing Normal University, Beijing 100875, China; 4. China National Institute of Cultural Property, Beijing 100029, China

Received:2010-03-29 Online:2011-05-10 Published:2011-09-23

摘要/Abstract

摘要： 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，对岩土体内不同形状和不同埋深的目标地质体进行了雷达响应正演模型研究，并分析了这些模型的实际分辨能力和应用条件。结果表明，对于不同的探测任务，应根据感兴趣目标体的几何尺寸、分辨率要求等来选择合适的天线频率；不同几何形状的点状不良地质体所呈现的雷达剖面形式各异，且雷达反射信号强弱也不同；同一频率天线其探测分辨能力随空洞埋藏深度而变化，同一埋深下，天线频率越高，高度分辨能力效果越好。研究结果可为钻孔雷达用于岩体工程勘察、灾害隐患探测提供模拟图像认知和数据判读支持

关键词: 钻孔地质雷达, FDTD, 形状效应, 点状不良地质体

Abstract: Borehole radar can probe deep underground geoenvironment through arranging a dipole antenna in a borehole, and it is a good logging tool to obtain the electrical signals of geologic formation. According to the common point unfavorable geo-bodies in borehole radar exploration, such as cavities, karst caves and buried objects etc., the electrical response of the tool to point unfavorable geo-bodies of different geometry and buried depth is investigated. The application conditions and resolution response capabilities of the simulation models are analyzed. It reaches that the proper antenna frequency should be chosen according to the physical dimension of object-of-interest and resolution requirement of the exploration task; and that the radar cross section of geo-bodies with different geometry appears various characteristic. The resolution capacity of borehole radar antenna varies with the buried depth of geo-bodies; and the borehole radar with higher frequency antenna can obtain reflected signals of higher resolution. However, the reflected signals detected by the borehole radar with a higher frequency will attenuate faster than one with lower frequency antenna. The results provide visualized perceptual knowledge and abundant interpretation support for borehole radar using in geologic survey and potential disaster detection, and help to improve the accuracy of geological interpretation

Key words: borehole radar, finite difference time domain (FDTD), geometric effect, point unfavorable geologic bodies

中图分类号:

TN 95

钟声，王川婴，吴立新，吴育华，王清远. 点状不良地质体钻孔雷达响应特征的形状效应正演分析[J]. , 2011, 32(5): 1583-1588.

ZHONG Sheng , WANG Chuan-ying , WU Li-xin , WU Yu-hua , WANG Qing-yuan. Borehole radar response characteristics of point unfavorable geo-bodies ——Forward simulation on its geometric effect[J]. , 2011, 32(5): 1583-1588.

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