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九龙江北溪引水左干渠改造二期工程新挖双孔输水隧洞需下穿漳厦高速公路。下穿隧洞位于基岩全风化与弱风化交界处,地下水丰富,开挖面下部为弱风化辉石闪长岩,上部为全风化辉石闪长岩或残积砂质粘土,并含零星孤石,地质情况复杂,施工开挖难度大。该文通过该地段隧洞开挖临时支护设计、施工措施、存在问题及原因分析、隧洞塌顶处理等问题的介绍和探讨,总结复杂地质条件下下穿高速公路隧洞开挖临时支护的设计施工技术,供参考。
The second phase of the North Diversion Project of the Beixi Water Diversion Project on the left main channel of the Jiulong River should be punctuated with the Zhangxia Expressway. The lower tunnel is located at the junction of fully weathered bedrock and weakly weathered bedrock, with abundant groundwater. The lower part of the excavation face is weakly weathered pyroxene diorite, and the upper part is fully weathered pyroxene diorite or residual sandy clay with sporadic boulders , Complex geological conditions, construction excavation difficult. Through the introduction and discussion of temporary support design, construction measures, existing problems and reasons analysis, tunnel collapse treatment and other issues in this section, this paper summarizes the design of temporary support for tunnel excavation of expressway under complicated geological conditions Construction technology, for reference.