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为了研究30°斜穿地裂缝的盾构隧道管片衬砌结构在地裂缝影响下的变形破坏模式和影响规律,从西安地铁盾构隧道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模型试验的相似常数,对模型混凝土、模型钢筋、结构围岩、模型管片及其连接螺栓参数等进行了设计。该结构模型试验能对结构钢筋、混凝土进行应变测量,对结构接触土压力和结构外围土压力、结构内部收敛位移、模型顶表面土体变形等进行观测。借助地基沉降试验平台,通过自锁式千斤顶的缓慢下降,实现对地裂缝上盘相对下降的模拟,地裂缝的活动速率和错动量通过工控机控制自锁式千斤顶的运行速率和行程来实现。试验结果表明:该试验设计满足地裂缝活动下30°斜交盾构隧道管片衬砌结构变形破坏模式和破坏范围研究的需要,能实现模型试验目标;地基沉降试验平台能较好地模拟地裂缝的活动。
In order to study the deformation failure mode and influence law of the shield tunnel segment lining structure with 30 ° oblique penetration through ground fissures under the influence of ground fissures, this paper, based on the background of the Xi’an Xi’an Shield Tunnel Project and the geological environment of the fissures in Xi’an, The similarity constants of shield tunnel segment structure model test are designed, and the parameters of model concrete, model reinforcement, structural surrounding rock, model segment and its connecting bolts are designed. The structural model test can measure the strain of reinforced concrete and concrete, and observe the contact pressure of soil and structure, the internal pressure of structure, the internal displacement of structure and the deformation of the top soil. With the foundation settlement test platform, through the slow down of the self-locking jack, the simulation of the relative decrease of the ground fissure on the disk was realized. The movement rate and the amount of the wrong movement of the ground fissure were realized through the control of the operating speed and stroke of the self-locking jack by the IPC. The experimental results show that the design of this experiment can meet the need of research on the deformation failure mode and failure range of the tunnel lining structure under the action of the ground fissure in 30 ° bias and can achieve the goal of model test. The ground settlement test platform can simulate the ground fissures activity.