Safe Construction Techniques for Tunnels Passing through Fractured Fault Zone
GONG Cheng － ming1，MENG Qing － yu2，LI Wu － hong3
1． Projects Management Center，Ministry of Railways ，Beijing 100844，China; 2． The Third Railway Survey and Design Institute Group Corporation，Tianjin 300251; 3． China Railway 12th Bureau Group Co． Ltd，Taiyuan，Shanxi 030024，China
Abstract：Research purposes: It is often encountered during tunnel construction that it has to pass through fractured fault zone． The geological hazards，such as water and mud gushing，spoil flowing etc． may occur in construction． This paper discusses on the safe construction techniques for tunnels passing through fractured fault zone when encountering water and mud gushing，spoil sliding etc． And it puts forward the rational solutions to ensure the construction safety，quality and construction period．
Research conclusions: Taking Jiubao Tunnel project on Zhang Jiakou － Ji Ning Railway as an example，this paper studies on safe construction techniques for tunnel passing through F3 fractured fault zone and water － rich zone． The rules of “ depressurization，dewatering ，advance support，safety guarantee”are put forward． It presents that the key point of hazard prevention and safe construction is to solve the problems of high pressure water．
Zhang Mei． New Technology of Energy Releasing and Pressure Reduction for High － pressure，Water － rich， Filled Cavity in Karst Tunnel［M］． Beijing: Science Press，2010．
Zhang Minqing，Huang Hongjian，Miao Dehai，etc． The Technology of Treating Karst for Yichang － Wanzhou Railway and Its Engineering Example ［J］． Journal of Railway Engineering Society，2008( 1) : 26 － 36．
Nan Chen，Zhang Minqing． Construction Technology of Underground River Section of Wuzhaoguan Tunnel［J］． Chinese Journal of Geotechnical Engineering，2007( 6) : 948 － 953．
2012, Vol. 29 
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