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《The Chinese Journal of Nonferrous Metals》 2012-03
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Numerical simulation of advanced detection with DC focus resistivity in tunnel by finite element method

LIU Jian-xin1,2,DENG Xiao-kang1,2,GUO Rong-wen1,2,LIU Hai-fei1,2,TONG Xiao-zhong1,2,LIU Zhuo1,2(1.Key Laboratory of Metallogenic Prediction of Nonferrous Metals,Ministry of Education,Central South University,Changsha 410083,China;2.School of Geosciences and Info-Physics,Central South University,Changsha 410083,China)  
By finite element method,the focus of DC method detection distance influence factors and the valid detection distance were studied.The effects of the aquifer bed volume variation,the range of potential electrode,the ratio of anomalous resistivity and the metallic anomalies existing behind the tunnel face on the advanced detection distance were simulated.The results indicate that the distance between the tunnelling surface and aquifer bed,the range of potential electrode and the ratio of anomalous resistivity have a slight influence on the detection distance,meanwhile,the effect of the metallic anomalies existing behind the tunnel is not obvious.However,the detection distance can be affected greatly by the volume variation of the target(the aquifer bed) right ahead the tunnel,and effective detection range is 10-11 m.
【Fund】: 国家自然科学基金资助项目(41174103);; 国家“十二五”科技支撑计划项目(2011BAB04B08);; 国家博士点基金资助项目(20110162130008);; 湖南省研究生科研创新项目(CX2011B101)
【CateGory Index】: P631.3
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