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根据山岭隧道的特点,考虑隧道围岩松散岩体的竖向惯性力和隧道结构本身承受的地层形变压力,基于反应变位法的基本原理,结合隧道当量半径的思想,得到隧道结构横截面抗震计算的近似方法。通过算例分析可知,在剪切波作用下,衬砌结构存在较大的拉应力,拱顶45范围内具有较大的弯矩和剪力,这是隧道抗震设计需要加强衬砌的重要因素之一。同时,该方法计算结果偏于保守,适用于强震作用下的情况。对于山岭隧道横截面抗震初步设计,可以应用该方法进行衬砌的强度验算。
According to the characteristics of mountain tunnel, taking into account the vertical inertial force of loose rock mass surrounding tunnel and strata deformation pressure of tunnel structure, based on the principle of reaction displacement method and considering the tunnel equivalent radius, Approximate method of calculation. The results show that under the action of shear wave, there is a large tensile stress in the lining structure and large bending moment and shear force in the area of the dome 45, which is one of the important factors in the seismic design of the tunnel . At the same time, the result of this method is conservative and suitable for the situation under strong earthquake. For the initial design of mountain tunnel cross-section anti-seismic, this method can be used to check the strength of lining.