【摘要】 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。更多还原

【Abstract】 According to the features of mountain tunnel,considered the vertical inertia of loosed surrounding rock and stratum deformation pressure on tunnel itself,based on the principle of displacement response method and the idea of equivalent radius,the approximate seismic analysis method of cross-section of mountain tunnel was obtained.The analysis of calculation example shows that(1) under the action of shear waves,great tensile stress existed in the lining,bending moment and shear force existed within the range of 45 degrees of vault,which is one of the important factors to strengthen the tunnel lining when considering the seismic design of tunnel;(2) the method could be applied to the tunnels under the action of strong earthquake due to its conservativeness;(3) in the preliminary design of earthquake-resistance of cross-section of mountain tunnel,the method could be applied to check the strength of lining.更多还原