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

• Geotechnical Engineering • Previous Articles     Next Articles

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

ZHONG Sheng1, 2，WANG Chuan-ying2，WU Li-xin3，TANG Xin-jian2，WANG Qing-yuan1   

  1. 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

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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

CLC Number: 

  • P 583
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