Abstract：Research purposes: Base on the study on the principle of OCCAM inversion method，the objective function of the OCCAM was modified，the constrained inversion item was added，the concept of constrained inversion of electrical parameter was proposed and the inversion of electrical parameter module was developed to improve the resolving ability of the magnetotelluric method for the exploration of large railway tunnel．
Research conclusions: From the comparison of the model＇s conventional onstrained inversion result with the electrical parameter result，it could be seen that the imaging effect of the constrained inversion with prior information was better than the conventional inversion． The method was used for the data processing，and the comparison of the results before and after constrained inversion for the Fangdoushan Tunnel showed that the constrained inversion results of the geological structure such as the fold，fault and karst more tallied with the real situation．
［1］ C． deGroot － Hedlin and S． Constable． Occam ＇ s Inversion to Generate Smooth Two － dimensional Models from Magnetotelluric Data ［J］． Geophysics，1990( 12) : 1613 － 1624．
［2］ Weerachai Siripunvaraporn and Gary Eqbert． An Efficient Data － subspace Inversion Method for 2 － D Magnetotelluric Data［J］． Geophysics，2000( 3) : 791 －803．
［3］ J． T． Smith and J． R． Booker． Rapid Inversion of Two － and Three － dimensional Magnetotelluric Data［J］． JGR， 1991( B3) : 3902 － 3922．
［4］ Anatoly S． Alekseev． Quantitative Statement and General Properties of Solutions of Cooperative Inverse Problems［C］/ /SEG 61st Annual， 1993．
Yang Hui，Wang Jialin，Wu Jiansheng， etc． Constrained Joint Inversion of Magnetotelluric and Seismic Data Using Simulated Annealing Algorithm［J］． Chinese Journal of Geophysics， 2002( 5) : 723 － 734．
Li Jian，Deng Hongke，Zhang Jiade，etc． Application of Geological Routing about CSAMT Exploration in Gaoligong Mountain Tunnel of DaliRui Railway［J］．Hydrogeology and Engineering Geology，2009 ( 2) : 72 －76．
Li Jian， Luo Shimin， Yu Nian． Application of Geophysical Prospecting in Geothermic Survey for Railway Tunnel［J］． Journal of Railway Engineering Society， 2011( 4) : 37 － 41．
2012, Vol. 29 
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