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结合双丰隧道第三系砂泥岩与安山玢岩接触带特性,通过隧道结构方案的综合研究、试验段结构受力监测、洞室变形监测、数值模拟等方法,确定了不同条件下合理的支护参数、施工方法和辅助工程措施,全面控制了隧道变形;认真分析接触带的富水情况,砂质泥岩遇水软化膨胀和流变性,以及接触带地段的施工技术重点、难点,制定切实可行的接触带施工方法、施工工艺等,规避塌方风险,保证施工顺利进行和施工安全。
According to the characteristics of the contact zone between the sandstone and mudstone and the andesite in the Shuangfeng tunnel, the tunnel structure scheme, stress monitoring in the test section, cave deformation monitoring and numerical simulation are used to determine the reasonable Support parameters, construction methods and auxiliary engineering measures to fully control the deformation of the tunnel; careful analysis of the contact zone of water-rich situation, sandy mudstone water softening expansion and rheology, as well as contact with the construction of the lot of the key points and difficult to develop effective Feasible contact zone construction methods, construction techniques, to avoid landslide risk and ensure the smooth construction and construction safety.