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| STABILITY ANALYSIS AND REINFORCEMENT TECHNOLOGY OF MINED-OUT AREA IN TIESHAN TUNNEL |
| Li Zhiguo |
| (Science Research Institute of China Railway Tunnel Group， Luoyang 471009 China) |
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Abstract Tieshan tunnel of the Bapeng road is located in Daxiang of Shichuan province with the total length of 2 099 m. The tunnel passes through coal mined-out area K17-1，K21 and K24. The deformation，cracking，alteration and falling occur at the secondary lining at the station of K140+527～608 due to the influence of mined-out area，underground water and other factors，which do harm to the traffic safety，and must be cured. The stability of roof rocks of mined-out area is analysed according to engineering geological conditions and the reinforcement technology of mined-out area is presented.
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2002, Vol. 21 
