下车亭隧洞出口段不良地质条件分析及处理措施

Bad Geological Conditions and Treatment Measures of the Xiacheting Tunnel Exit

下车亭隧洞为南水北调中线京石段工程大型输水建筑物之一,出口段地质条件复杂,岩体风化严重,宽大裂隙发育,多被红粘土充填,出现风化深槽,出口洞脸垂直边坡稳定性较差。通过攻克洞口围岩"半岩半土"进洞技术难题,保证了隧洞工程的安全。这些技术难题的解决,为复杂地质条件下隧洞工程的建设提供了借鉴和参考。

The Xiacheting tunnel is one of a large water buildings of Jing-Shi section in the Mid-route of South-North water transfer, the geological conditions of the exit is complex, rock weathering serious and large fissures, more were filled with red clay, appearing weathered deep grooves, export holes face vertical slope and less stable. Capturing the technical problems of ＂semi-rock and-semi-soil＂ of hole surrounding rock to ensure the safety of tunnel construction. The solve of technical problems provide a reference for the construction of the tunnel project in the complex geological conditions.