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实际工程中初衬受力与变形很大因而初衬会进入塑性,应将初衬视作弹塑性加固材料进行设计计算。结合一个青岛地铁车站衬砌的设计计算,将强度折减法应用于隧道稳定性分析。考虑衬砌施作时的围岩应力释放率影响,利用强度折减法计算隧洞围岩及衬砌的安全系数。初衬后围岩安全系数不应小于1.15～1.20,如果围岩安全系数小于1.30,此时二衬将承受一定荷载。二衬安全系数与初衬后围岩安全系数的乘积应大于2,以确保二衬安全。通过计算可以定量的确定初衬和二衬的结构尺寸,确保隧洞安全并合理降低成本。
The actual project in the early lining of the force and deformation so that the first line will enter the plastic, the lining should be treated as elastic-plastic reinforcement material design and calculation. Combined with the design and calculation of a Qingdao subway station lining, the strength reduction method is applied to the tunnel stability analysis. Considering the influence of stress release rate of surrounding rock during lining, the safety factor of tunnel surrounding rock and lining is calculated by strength reduction method. The safety factor of surrounding rock after primary lining should not be less than 1.15 ~ 1.20. If the safety coefficient of surrounding rock is less than 1.30, the secondary lining will bear a certain load at this moment. The product of the safety factor of the lining and the safety factor of the surrounding rock after the initial lining should be greater than 2 to ensure the safety of the lining. Through the calculation, the structural dimensions of the primary lining and the secondary lining can be quantitatively determined, so as to ensure the tunnel safety and reasonably reduce the cost.