渡槽结构中桩土动力相互作用分析方法探讨

重点研究了渡槽结构桩土动力相互作用的数值分析方法,建立了能反映桩体与土体相对运动和其实际几何尺寸的非线性桩土动力相互作用的分析模型。以南水北调中线穿黄渡槽结构桩土动力相互作用问题为研究对象。分别采用传统的M法和非线性有限元法进行了数值模拟计算。结果表明,在地震作用下,所建的非线性模型与M法相比,无论墩顶位移还是桩体的应力,M法的结果偏大1~2倍,采用M法的计算结果是偏于安全的。

Study of Soil-pile Interaction of the Large-scale Group-piles Foundations

The emphases of this paper is to research the numerical method of soil-pile dynamical interaction of large-scale group-piles foundations. The model which can display the relative displacement between soil and piles and can consider the real measurement of piles and soil is built. This paper adopts M method and the finite element method （FEM） respectively to simulate the engineering, the results of which are compared under earthquake load. It is found from the results that whether the displace of the top of the pier or the stress of the piles, the results of M method are 1-2 times of that of FEM. Although M method is not accurate enough, the M method is safer. Because the M method is simple, efficient and safer, it is feasible to use the M method.