研究目的:通过介绍宜万铁路马鹿著隧道突水突泥过程、抽排水试验，地表深孔施作堵水塞，对施工过程 中开挖揭示堵水塞施作情况进行观察，分析第一次堵水塞失效原因，探讨堵水塞机理，并对堵水塞今后施作提 ，出技术改进措施，以期为今后类似工程抢险积累经验。
研究结论:隧道发生突水突泥后，若突水物以泥砂为主，采取抽水措施难以达到目的，应采取堵水塞措施。 堵水塞对马鹿著隧道突水突泥治理是成功的。堵水塞设计长度除进行抗剪强度验算外，应根据工程突水突泥 介质特征和注浆机理确定。马鹿臀隧道突水突泥介质为粘性土和水，堵水塞注浆机理主要表现为挤占沉积作 用和水化固结作用，同时受地表降雨和间断注浆影响，产生浆液结石体层间浮积作用，因此，堵水塞长度应取 10～20倍洞径为宜。
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.
PDF(727 KB)
