高速铁路柱锤冲扩桩复合地基沉降有限元分析

Finite Element Analysis of the Settlement of the Composite Foundation of Column-hammer Thrust-expanded Piles in the Construction of High-speed Railway

高速铁路路基的关键技术在于控制其沉降在允许范围之内。采用有限元可以模拟柱锤冲扩桩复合地基在各种工况下的工作状态。结合工程实例,运用MIDAS/GTS软件建立二维模型,对不同垫层和路堤厚度、水泥掺量、桩径和桩间距的复合地基影响因素进行系统分析,研究了柱锤冲扩桩复合地基在不同工况下的沉降规律。

It is the key technique in the construction of the subgrade of high-speed railway to control the subgrade settlement within the allowable range.With the finite element method,the working states under different working conditions of the composite foundation of column-hammer thrust-expanded piles can be imitated.Based on a practical project,and by using the two-dimensional model established with the software of MIDAS/GTS,systematic analysis is carried out on the depth of different factors influencing the composite foundation such as cushion layers and embankment,cement content,pile diameters and distances.And the regular settlement patterns of the composite foundation under different working conditions are studied at the same time.