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《Chinese Journal of Geophysics》 2011-04
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Study of full-space numerical modeling of advanced exploration in tunnel with DC Focus resistivity method

ZHANG Li~1,RUAN Bai-Yao~2,L(U|¨) Yu-Zeng~2,YANG Ting-Wei~2,CHEN Wei-Ying~2,LI Jing-He~2 1 School of Geosciences and Info-Physics,Central South University,Changsha 410083,China 2 College of Earth Sciences,Guilin University of Technology,Guilin 541004,China  
Conventional tunnel DC resistivity advanced detection method for survey behind the tunnel face is influenced by the tunnel body and working environment which greatly increase the difficulty of data interpretation.Using the principle of same current repelling each other,and with reference to the vertical ground resistivity sounding and DC laterlog technology the authors proposed a vertically focused advanced detection scheme on the tunnel face and the wall which is good for tunnel space.Finite element numerical simulation method(FEM) was used to simulate the effect of focused advanced detection method in three-dimensional tunnel space.Compressed storage technology and preconditioned iterative algorithm greatly improved the efficiency of forward modeling as well.Comparison between the FEM modeling results and analytical results of full space tunnel models and physical simulation results in soil bin showed that the accuracy of forward simulation meets the requirement and the designed focusing detection device of the vertical gradient and the potential can achieve the purpose of focused advanced detection.The results that simulated complex models in the conditions of vertical focused observation showed that the scheme can effectively detect the ill geologic bodies in front and side tunnel.
【Fund】: 国家自然科学基金项目(40774057);; 广西科学基金项目(桂科自0832263)资助
【CateGory Index】: P631.3
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