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从西安地铁1#线工程背景和西安地裂缝地质环境出发,根据相似理论设计了盾构隧道管片衬砌结构30°斜穿地裂缝的物理模型试验。管片混凝土应变、纵向和环向螺栓应变、结构接触土压力外围土压力、结构内部收敛位移、模型顶表面土体变形以及宏观变形破坏现象表明:盾构隧道管片衬砌结构30°斜穿地裂缝的变形破坏模式为剪切变形为主,局部有扭转变形;结构破坏范围为上盘1.25D,下盘0.75D(D为管片环外径);管片衬砌结构变形破坏不对称,管片环向处于偏压状态;环缝拱底位错量大于拱顶和拱腰,拱底最大位错量达40 mm(0.033D),模型难以适用地裂缝错动变形20 cm(0.1667 D),盾构管片衬砌结构不适用于地裂缝活动强烈的地质环境。
Based on the engineering background of Xi’an Subway Line 1 and the geological environment of Xi’an fissure, the physical model test of the shield tunnel segment lining structure crossing obliquely through the ground cracks was designed according to the similarity theory. The strain of the slab concrete, the strain of the longitudinal and circumferential bolts, the earth pressure on the periphery of the structure contacting earth pressure, the internal convergence and displacement of the structure, the deformation of the soil body on the top surface of the model and the macroscopic deformation and destruction show that: The deformation and fracture modes of the cracks are mainly shear deformation and local deformation. The failure range of the structure is 1.25D on the upper plate and 0.75D on the lower plate (D is the outer diameter of the segment ring) The maximum dislocation amount of arch bottom is 40 mm (0.033D), and the model is difficult to apply. The ground fissure is displaced by 20 cm (0.1667 D) , Shield tunnel lining structure is not suitable for ground fissures strong geological environment.