【摘要】 通过建立和求解饱和土中圆形隧道在地震加速度作用下的动力控制方程,得出了该问题的通解;再根据弹性力学问题的几何方程和物理方程,推导出了饱和土及隧道结构中的应变及应力分量表达式;结合饱和土中圆形隧道在地震加速度作用下动力响应的边界条件,对其进行了数值计算,较为全面的分析了地震频率、隧道结构参数以及地震加速度大小对饱和土中圆形隧道对地震响应的影响。研究结果表明:随着地震频率的增加,孔隙水压力和土体应力分量最大值减小;隧道衬砌结构剪切模量的增加,孔隙水压力和土体应力分量最大值均有所增加;地震加速度的大小对孔隙水压力和土体应力分量影响最为明显,地震加速度增加的倍数与各应力分量增加的倍数基本一致,随着离开隧道距离的增加,饱和土中孔隙水压力、径向应力分量和切向应力分量迅速衰减,而剪应力分量值最大且呈正负交替较慢衰减;这些研究结果对正确理解饱和土中圆形衬砌隧道的抗震性能、破坏机理以及指导隧道抗震设计都有参考意义。更多还原

【Abstract】 By establishing and solving the dynamic control equations for circular tunnels in saturated soil to the effect of the seismic acceleration,the general solution is obtained.According to the geometrical equation and physical equation for the elastic mechanics problem,the stress and strain expressions in the saturated soil and tunnel structure are deduced.Based on a circular tunnel in saturated soil under the action of earthquake acceleration boundary conditions,the numerical calculation is carried out,and the influences of seismic frequency,tunnel structure parameters and seismic acceleration on the seismic response of the circular tunnel in saturated soil are comprehensively analyzed.The results show that,with the increase of the earthquake frequency,the pore water pressure and the maximum values of stress components decrease.The pore water pressure and the maximum values of stress components increase when the tunnel lining structure shear modulus increases.The effect of the seismic acceleration on the pore water pressure and stress component is the most obvious,and the increase ratio of earthquake acceleration and the increase multiples of stress components are basically the same.With the increase of the distance away from the tunnel,the pore water pressure,radial stress component and tangential stress component decrease obviously,and the shear stress component is large and has slow attenuation.These results are very helpful for correctly understanding the seismic performance,damage mechanisms and seismic design of tunnels.更多还原