SV波作用下饱和土中深埋复合式衬砌动力响应研究  

Dynamic response of deep circular composite-lined tunnel in saturated soil subjected to incident SV waves

作　　者：宋金博[1] 宋瑞[2] SONG Jin-bo;SONG Rui(Jiangxi V&T College of Communication,Nanchang 330013,China;Nanchang Institute of Technology,Nanchang 330029,China)

机构地区：[1]江西交通职业技术学院,江西南昌330013 [2]南昌工程学院,江西南昌330029

出　　处：《振动工程学报》2020年第2期383-390,共8页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51608201);江西省交通厅科技项目(2016H0013,2015T0060);江西省教育厅科技项目(GJJ151425)。

摘　　要：利用波函数展开法,得出了SV波作用下深埋复合式衬砌动应力集中问题的解析解,并将其退化为弹性介质中单层衬砌对SV波散射问题,验证了结果的可靠性。研究结果表明,饱和土中复合式衬砌内边界动应力集中系数大于外边界,其原因是内侧衬砌刚度大于外侧衬砌刚度及衬砌内侧为凌空边界所致;增加内外侧衬砌的厚度可很大程度上减小衬砌内动应力集中系数;复合式衬砌刚度对衬砌动应力集中系数影响较为显著,在保证内外侧衬砌稳定的情况下,应尽量减小内外衬砌的刚度差,以减小衬砌内应力放大效应。Based on wave function expansion method,an analytical solution for dynamic stress concentration of the composite lining in saturated soil under incident SV waves is obtained.The solutions are verified by degenerating the studies of saturated medium into elastic medium and single lining.According to the solution,the internal dynamic stress concentration factor is larger than the outer boundary of the composite lining in saturated soil.The reasons are that the stiffness of internal lining is larger than outer lining and volley boundary of internal lining.Increasing the thickness of outer lining and inner lining can reduce the dynamic stress concentration factor of the lining obviously.The stiffness of the composite lining affects the dynamic stress concentration factor of the lining greatly.The stiffness difference between internal and outer lining should be reduced to weaken the scaling effect in the case of guaranteeing stability of internal and outer lining.

关 键 词：复合式衬砌 SV波 饱和土 圆形衬砌 深埋 

分 类 号：TU352.1[建筑科学—结构工程] TU435