高填方对分层地基地埋管线影响的三维分析方法

Three-dimensional method for response of embedded pipelines to earthfill load

首先根据层状弹性半空间理论计算出由高填方引起的地埋管线所在位置处的土体自由位移场,之后将得到的土体自由位移场作为外界条件施加于地埋管线上,基于改进的Winkler地基模型,建立高填方与邻近的软土地基地埋管线相互作用的弹性地基梁微分方程,并运用有限差分法求解该微分方程,进而提出计算地埋管线在高填方条件下响应的三维简化理论分析方法。最后,通过与有限元算例对比,表明该方法合理可行,能够有效的分析软土区域高填方对邻近地埋管线的影响。

The earthfill load causes soil motion and further produces-additional deformation and stress on the embedded pipelines in the ground. The deformation and stress may damage the pipelines. To avoid the drawbacks of three-dimensional numerical analysis, such as complex modeling and time consuming, a two-stage method(TSM) is proposed for determining the behavior of the adjacent pipelines caused by the earthfill load. Firstly, the additional deformation of soil mass due to the adjacent high fill is calculated by the layered elastic half-space theory. Secondly, the governing differential equations are established based on the Winkler subgrade model and the finite difference method is used to solve the equations, and then the simplified method is derived. Finally, three-dimensional numerical analysis show that the calculated results of analytical solution are reasonable, and the proposed three-dimensional simplified method is able to analyze the influence of earthfill load on the adjacent pipeline buried in layered soils.