【摘要】 采用修正的Biot波动方程,运用波函数展开法研究了剪切波入射时,饱和土体内深埋圆形衬砌的散射问题,通过数值计算分析了衬砌内侧的动应力集中因子Sd与界面处饱和土体的孔压集中因子p*f的变化规律.结果表明:当剪切波为低频和中频入射时,Sd和p*f沿周向的分布曲线比较光滑,而且Sd和p*f受衬砌厚度影响较小,而高频时Sd和p*f沿周向的分布曲线出现大量的凹进和凸出部分,而且在大部分区域Sd和p*f随着衬砌厚度的增大而减小.更多还原

【Abstract】 The amended Biot’s model of wave motion and the expansion method of wave functions are adopted,and the scattering problem of circular lining deeply buried in saturated soil by incident shear waves is studied.Dynamic stress concentration factor(Sd) at inner side of the lining and pore pressure concentration factor(pf*) at the boundary between the lining and saturated soil are analyzed.The results show that the curves of Sd and pf* are smooth and nearly not influenced by the lining’s thickness when the incident frequencies of shear waves are lower,while the curves of Sd and pf* have concave and convex parts and Sd and pf* decrease with the increasing of lining’s thickness when the incident frequencies of shear waves are higher.更多还原