Abstract：Abstract ： Research purposes ： During the process of the construction, the geological hazard of water and mud breakout occurs in the Xiaogao Mountain Tunnel. Based on the drilling, geophysical exploration and surface investigation, the comprehensive analysis method, such as the hydraulic analysis method，the karst depression analysis method，the water mark investigation method, is adopted, the law of the development of karst pipeline and the maximum water amount of water and mud breakout are found out，which provides the basis for the drain tunnel. The causes and countermeasures of the occurrence of water and mud breakout are analyzed.
Research conclusions:(1) The water and mud breakout is karst pipeline type in the Xiaogao Mountain Tunnel. The
disaster cause is related to the periodic rainfall，the blocked karst pipeline caused by construction，the natural flawed in tunnel lining and structure, the weak watertight board between the bottom of the tunnel and the karst pipeline. (2) The largest water and mud breakout amount of the karst pipeline is 108 288 m3/h and drain cave settings should play a role to release water pressure，to ensure the safety of structure and operation. ( 3 ) The analysis of the cause of the water and mud breakout in the Xiaogao Mountain Tunnel provides the reference for the investigation and design of the karst tunnel and the emergency treatment of the water and mud breakout.
张会刚，张广泽，毛邦燕. 沪昆客专小高山隧道突水突泥及致灾原因探析[J]. 铁道工程学报, 2016, 33(8): 66-70.
ZHANG Hui - gang, ZHANG Guang - ze, MAO Bang – yan. Mechanism Analysis and Water and Mud Breakout in the Xiaogao Mountain Tunnel in Shanghai - Kunming Passenger Dedicated Railway. Journal of Railway Engineering Society, 2016, 33(8): 66-70.
2016, Vol. 33 
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