Abstract：Research purposes: The geological conditions of Wayaopo Tunnel are complex and unfavorable with the structural abrasion，karst，shallow － buried gully，fracture zones and so on． In order to prevent the tunnel collapse，mud irruption，water bursting and other accidents，it is necessary to enhance the precision of the geological forecast for the karst tunnel．
Research conclusions: ( 1) Based on geology method，the type，location and scale of the karst cavity were predicted mainly by using the advanced geological forecast system TGP206． ( 2) The seismic reflection method was available for forecast of the structure profile of the long － distance unfavorable geological body． ( 3) The GPR was available for the forecast of short － distance unfavorable geological body．
He Faliang， Li Changsong， Chen Chengzong． The Technology for Prediction of Water in Flow Disasters in Long and Large Tunnel， Karst Areas ［ J ］． Hydrogeology and Engineering Geology，2001( 5) : 21 － 23．
Wu Jun，Mao Haihe，Ying Song，etc． Application of Ground Probing Radar to Short － term Geological Forecast for Tunnel Construction［J］． Rock and Soil Mechanics，2003( S) : 154 － 157．
Li Changsong，Chen Chengzong． A Preliminary Study on Surrounding Rock Characteristic of Long and Large Tunnel［J ］． Modern Tunnelling Technology，2002( S) : 338 － 342．
Luo Lirui，Liu Zhigang，Yao Haibo，etc． Application of Geological Forecast in Construction of Qipanshi Karst Tunnel［J］． Journal of Railway Engineering Society， 2009( 11) : 134 － 137．
Zhou Liming，Liu Tianyou． Research on Application of TSP Detection Technology in Geological Forecast in Advance for Construction of Railway Tunnel ［J］． Journal of Railway Engineering Society，2008( 1) : 112 － 115．
Wei Dongxu． Geolinical Advance Prediction and Regulatory Construction of Karst Tunnel［J］． Sci － Tech Information Development ＆ Economy，2008 ( 12) : 362 － 363．
2011, Vol. 28 
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