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以某地铁标段隧道施工盾构为研究对象,建立了盾构密封舱压力分析的离散元数值模型。通过密封舱隔板观测压力的数值模拟结果与现场施工数据相比对,验证了模拟方法的可行性和模拟结果的正确性。在此基础上,研究平衡状态下不同刀盘开口率和埋深时密封舱隔板压力的分布规律,建立了密封舱隔板压力分布的数学模型;提出了掘进工作面压力与密封舱隔板压力的映射关系,并给出了压力传递系数与刀盘开口率的经验公式。研究结果表明:密封舱隔板压力分布可近似表示为二元五次函数多项式;在刀盘开口率一定的情况下,密封舱隔板压力与掘进工作面压力为线性比例关系。该结论为盾构施工密封舱压力平衡控制提供了理论依据。
Taking the shield tunnel of a metro tunnel construction as the research object, a discrete element numerical model for the pressure analysis of the shield sealed chamber was established. The numerical simulation results of the pressure observed by the seal bulkhead are compared with the field construction data to verify the feasibility of the simulation method and the correctness of the simulation results. On this basis, the distribution law of the pressure in the seal chamber at different cutter opening and depth under the equilibrium condition was studied, and the mathematical model of the pressure distribution in the seal chamber was established. The pressure of the working face and the pressure in the seal chamber Pressure mapping, and gives the empirical formula of pressure transfer coefficient and cutter opening rate. The results show that the pressure distribution of the seal bulkhead can be approximated as a bivariate polynomial with a polynomial of five. When the cutterhead opening ratio is constant, the pressure of the seal bulkhead and the pressure of the working face are linearly proportional. This conclusion provides a theoretical basis for the pressure balance control of shield construction of ballast tanks.