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提出了采用泄水式管片衬砌结构型式解决铁路隧道高水压问题的结构设计理念。考虑渗流场对围岩应力场的影响,建立了水荷载为渗透体积力的管片衬砌外荷载计算公式,探讨了围岩渗透系数与最大可泄流量、衬砌控制泄流量与衬砌壁后接触应力的相互关系,以及围岩条件对衬砌壁后有效应力和接触应力的影响规律,并将该计算方法与远场水荷载视为面力的简易衬砌外荷载计算方法进行对比,以评估简易方法的可行性。结果表明:将水荷载视为面力与将其视为渗透体积力进行接触应力计算时,两者结果仅在一定条件下具有良好的接近度,前者只能作为衬砌外荷载选择的一种参考。
The concept of structural design to solve the problem of high water pressure in railway tunnels is proposed by adopting the type of drainage pipe lining structure. Considering the influence of seepage field on the stress field of surrounding rock, the formula for calculating the external load of the lining of a ship subjected to permeate volume force is established, and the permeability coefficient of the surrounding rock and the maximum discharge capacity of the lining are discussed. And the influence law of the surrounding rock conditions on the effective stress and contact stress of the lining wall are compared. The calculating method is compared with the calculation method of the simple lining external load which the far-field water load is regarded as the surface force to evaluate the simple method feasibility. The results show that when the water load is regarded as the facial force and the contact stress is calculated as the penetrating bulk force, the results of the two have a good approximation only under certain conditions, and the former can only serve as a reference for the selection of the load outside the lining .