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以在建穿越5·12汶川强震区成都至兰州高速铁路站前试验段某隧道大变形极高风险段为工程依托,运用现场试验与数值模拟手段,针对传统的型钢拱架和新型自主研发的钢格栅混凝土核心筒支护结构体系,分别对围岩收敛变形、围岩深部位移、围岩与初支接触压力、拱架内力、锚杆轴力、初支与二衬接触压力以及二衬轴向应变变化特征与规律进行研究。结果表明钢格栅混凝土核心筒支护结构体系可有效控制强震区软弱破碎围岩隧道大变形,结构体系变形及受力合理,可为类似工程建设提供借鉴。
In order to build a very large risk section of a tunnel in the pilot section of Chengdu-Lanzhou High-speed Railway Station crossing the 5.12 Wenchuan earthquake zone, based on the project, field experiments and numerical simulation were conducted to analyze the effects of the conventional steel arch arches and the new independent research and development Of the steel grid concrete core tube supporting structure system, respectively, the convergence and deformation of the surrounding rock, deep displacement of surrounding rock, contact pressure of surrounding rock and the initial branch, arch internal force, anchor axial force, the contact pressure of the first branch and the second branch, The characteristics and regularity of axial strain change of lining are studied. The results show that the steel grid concrete core tube supporting structure system can effectively control the large deformation of the weak broken rock tunnel in the strong earthquake area, and the deformation and stress of the structural system are reasonable, which can provide reference for similar projects.