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| Discussion of Geophysical Exploration Pattern for the Railway Tunnel |
| LI Jian |
| China Railway Eryuan Engineering Group Co. Ltd,Chengdu, Sichuan 610031，China |
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Abstract Research purposes: With construction of high-speed railway in large scale, the tunnel length and tunnel amount increase rapidly. For the geological exploration，especially for the geophysical exploration for the tunnel，there are lots of works to be done with the big technical difficulties，many ways and high cost. The research was done on the geophysical exploration pattern for the railway tunnel on consideration of the cost of the geophysical exploration for the purpose of achieving the good exploration accuracy.
Research conclusions: (1) During the exploration and design stages, the CSAMT method is mainly used for exploring the 40m deep ground，the corresponding geophysical exploration methods should be used for exploring the ground of the less than 40m depth, and the multiple coverage seismic reflection wave method should be used for the geological exploration for the subaqueous (submarine) tunnel. (2) During the construction stage,the electric sounding method is used for exploring the tunnel base，the hole-crossing elastic tomography method is used for exploring the area with density distribution of coal goafs，the EM tomography method is used for exploring the karst area，especially for the karst with good development, the TPS method is used for the advanced geological forecast to the area in front of the working face of the tunnel，and the ground penetration radar is used for inspection of the lining quality of the tunnel.
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Received: 04 May 2012
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2013, Vol. 30 
