摘要
地下衬砌结构经常会受到内部动荷载的作用,内荷载引起的衬砌结构的动应力集中备受关注.采用Laplace变换和波函数展开法,对半空间饱和土中均布突加荷载作用下圆柱形衬砌结构的动力响应进行了研究.以大半径凸圆弧来近似半空间表面,将半空间饱和土中的波动方程展开成无穷级数的形式,应用Graff加法公式进行坐标变换,根据连续条件和边界条件,确定波函数展开式中的未知系数,求得了半空间饱和土中均布突加荷载作用下圆柱形衬砌的动力响应解答,讨论了衬砌埋深对圆柱形衬砌动力响应的影响.该问题的求解,为地下结构的动力分析提供了一种有效方法.
Buried lined tunnels are often subject to internal dynamic loading,such as blast loading and impact loading. The dynamic stress concentration of lining structure due to various dynamic sources is a special concern in practical engineering. The transient dynamic response of a cylindrical lining subjected to sudden internal uniform loading has been investigated with the Laplace transform and the method of the separation of variables. The wave potentials in a homogeneous saturated half space are expanded into Fou rier-Bessel series using the wave function expansion method. A convex approximation is used to replace the straight boundary of the half-space. In terms of continuity conditions and boundary conditions of the prob- lem,the unknown coefficients in potentials are determined by coordinate transform. The dynamic responses of the lining structure in saturated half-space are discussed for different buried depths of lining. This study provides an effective method for analyzing some similar problems about dynamic response of underground structure.
出处
《固体力学学报》
CAS
CSCD
北大核心
2012年第2期219-226,共8页
Chinese Journal of Solid Mechanics
基金
高等学校博士点基金新教师项目(Grant No.2103718120005)
国家自然科学基金(50878155)资助
关键词
饱和土
衬砌结构
瞬态响应
波函数展开法
半空间
saturated soil, lining structure, transient response, the wave function expansion, half-space
