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Abstract The Shaoyang—Huaihua highway is a section of the Shanghai—Ruili highway，which is a main national highway. The Xuefeng mountain highway tunnel，which is under construction，is the largest controlling project of Shaoyang—Huaihua highway. The length of the Xuefeng mountain tunnel is about 7 km and the largest thickness of its overlay is about 850 m. The fault F2 is a huge fault，which may have some effects on stability of surrounding rockmass during the tunnel construction，so it is necessary that accurate advanced prediction of the fault is given during the tunnel construction. During Xuefeng mountain construction，several kinds of prediction methods are used to predict the fault F2. Based on geological analyses，tunnel seismic prediction(TSP)，testing of surrounding rock stress，prediction method of fault portent and mechanism of fault movement are used in the comprehensive advanced geological prediction. The results of the prediction are as follows：section of ZK97+ 193–ZK97+220 will be influenced by fault F2；the fringe zone of will appear in section ZK97+220，and the central zone of the fault F2 will start in the section ZK97+235. By comparing the results of the prediction and in-situ results，the advanced prediction has encouraging effects.
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Received: 07 June 2007
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