Abstract：Research purposes:Based on the introduction to the water and mud bursting process in the Maluqing Tunnel, pumping and draining water test and constructing water stopping plug in the earth's surface deep hole, and observation of water stopping plug circa opened out by excavation in the course of tunnel construction, this paper analyzes the reason for the failure of stop water plug, discusses the water stopping plug mechanism, and presents the measure for improving the technology for construction of water stopping plug for the purpose of accumulating experience for the similar engineering in future.
Research conclusions: If the most substances in water and mud bursting are mud and sand, it is difficult for pumping water to treat water and mud bursting. In this case, the water stopping plug should be adopted to treat water and mud bursting. Based on the verification of the shearing force, the plug length should be designed according to the characters of water and mud bursting and grouting mechanism. The medium of the water and mud bursting in the Maluqing Tunnel is the cohesive soil and water, so the grouting mechanism should has the hustle-sediment action, the hydrate- concretion action and the float - sediment action in the cement concretion by the effect of the rainfall and the disconnected grouting. Therefore，the length of the water stopping plug must be of 10-20 times of the hole diameter.
2008, Vol. 25 
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