Abstract：Research purposes: Gangcheng Tunnel is a single tunnel and double track tunne,l located in the Hengshan County of Shanxi Province, with total length of 4575 m. The collapse happened during the construction of the tunnel,with the inrushmud volume ofabout1 000m3. The buried depth of the tunnel in collapse place was 94 meters, and the maximal ground settlementvolumewas5. 137 m. According to the characteristics of the collapse and inrushmud, the method of " large pipe roof construction plus the upper face grouting in advance " was selected to reinforce the rock stratum aftermaking comparisonwith the ramming pipemethod and freezing method.
Research conclusions:(1) The scheme for treatment of inrush mud and collapse is reasonable. (2) The support in advance along with grouting reinforcement of the inrushmud and collapse areaGangcheng Tunnel is an effective way to treat collapse and inrush mud. (3) The treatment of the collapse and inrush mud of Gangcheng Tunnel shows the geological forecast in advance is essential to the safe construction of tunnel.
2009, Vol. 26 
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