郑西客运专线深厚湿陷性黄土地基桩板结构设计分析

桩板结构是处理深厚湿陷性黄土地基的一种新型路基结构,主要由钢筋混凝土桩基、桩周土体、托梁和承台板四大部分组成,可严格控制高速铁路路基工后沉降,尤其适用于挖方以及低填方路段,且具有一定技术经济优势,在德国等高速铁路发达国家中已经得到成功应用,但目前其计算方法和设计理论尚不十分成熟、完善。结合郑西客运专线深厚湿陷性黄土地基处理,在对桩板结构主要构件优化分析的基础上进行了结构方案比选及技术经济比较,从而为设计施工提供参考。

Design and Analysis on Pile-Board Structure of Deep Collapsible Loess Ground along Zhengzhou-Xi'an Passenger Dedicated Railway Line

The pile-board structure,a kind of new treatment for subgrade in deep collapsible loess ground,is composed of pile,soil around pile,joist and board.It can strictly restrain the residual settlements after construction of high-speed railway foundation.It is especially suitable in the cut and low fill section.Compared with other ground treatments,it has some economic superiority.Such structure has been used in Germany,etc.Yet,at present,the design theory and calculation method are not mature and perfect.This paper,in light of the solution to pile-board structure of deep collapsible loess ground along Zhengzhou-Xi'an passenger dedicated railway line,and after optimum seeking analysis of the major components of the pile-board structure,makes comparisons in various components and technique economy,providing useful reference for the design and construction.