设置软衬垫的地下圆形结构的动应力集中

本文利用波函数展开法求解了设置软衬垫防护的地下圆形结构的平面ＳＨ波、Ｐ波及ＳＶ波作用下的稳态响应，求出了结构内壁周向应力的动应力集中系数，并详细计算了软衬垫的弹性性质参数及厚度对动应力集中系数的影响曲线。本文计算的不分层空穴情形的结构与文献中结果完全吻合。本文结果不仅可为地下坑道工程的设计提供必要的参数，而且为进一步研究该类问题的瞬态响应提供参考。

DYNAMIC STRESS CONCENTRATION OF CUSHION-PROTECTED ROUND UNDERGROUND STRUCTURES

In this paper, the stable responses of a cushion-protected round underground structure excited by SH-wave, P-wave and SV-wave respectively are investigated by the use of the method of wave function expansion. And the dynamic stress concentration factors around the inside structure are thus presented.Furthermore,the variations of the stress concentration factors with the elastic parameters and the thickness of the cushion are also plotted. Results of unlayered openning obtained in this paper agree well with those presented by other papers. Results of investigation of this paper provide the necessary parameters for engineering design of such underground structure and also offer the reference for the research of the instantaneous response of similar problems.