湿陷性黄土地区高速铁路路基地基沉降控制技术

Technology to Control Subsidence of High Speed Railway Subgrade Foundation in Collapsible Loess Region

郑西、西宝和大西高速铁路是我国在湿陷性黄土地区先后修建的无砟轨道高速铁路,黄土地基湿陷沉降是影响铁路安全的关键因素。结合这3条高铁路基工程,开展了物理力学试验、应力测试、桩身材料试验、现场浸水试验和沉降观测,对黄土路基地基的湿陷变形量、沉降计算影响深度、沉降计算经验修正系数、压缩模量扩大系数等进行了分析,并对适用于高速铁路的湿陷性黄土地基处理方法进行了总结,可为湿陷性黄土地区高速铁路路基地基沉降控制提供参考。

Zhengzhou-Xi＇an,Xi＇an-Baoji, and Datong-Xi＇an high speed railways are the earliest ballastless track high speed railways in collapsible loess region of China. The collapsible subsidence of loess foundation is a key influence factor of railway safety. Combined with the subgrade engineering of these three lines, physical mechanical test,stress test,pile material test,in-situ water immersion test and subsidence test were conducted in this paper. The collapsible deformation of the losses subgrade foundation, calculated depth and empirical correction coefficient of subsidence, magnifying coefficient of compression modulus were analyzed. The method of collapsible loess foundation treatment for high speed railway was summarized, which provided a reference for subsidence control.