水泥土排桩加固重载铁路路基的数值分析

Numerical Analysis of Reinforcing Heavy Haul Railway Subgrade by Cement Soil Piles

研究目的:随着对铁路运输能力要求的提高和重载铁路的发展,铁路机车车辆轴重增大、运量增加、速度提高,铁路路基病害问题日益突出,因此需要探索一种在线路运营条件下路基结构的快速加固方法。本文采用基于Mohr-Coulomb的理想弹塑性模型对水泥土排桩加固重载铁路路基进行数值模拟,明确水泥土排桩对重载铁路路基变形的控制作用、加固效果以及水泥土排桩加筋对加固重载铁路路基的影响。研究结论:通过对水泥土排桩加固重载铁路路基的数值分析,得出以下结论:(1)路基顶面最大沉降值在重车线路中心线处;(2)水泥土排桩能有效地控制路基面的沉降和路基坡面的水平位移,并随着水泥土排桩排数的增加,对路基变形的约束作用越来越明显;(3)水泥土排桩加筋后明显的分散了水泥土排桩受到的拉应力,有效地提高了水泥土排桩的整体性;(4)加筋水泥土排桩是一种有效的加固方法,可以应用于重载铁路路基在运营条件下的快速加固。

Research purposes： With the improved requirements of railway transport capacity and development of heavy haul railway, the axle load on rail, loading capacity and running speed have increased with result in increasingly outstanding diseases of railway subgrade. So there is a great need to explore a rapid strengthening method of subgrade structure of heavy haul railway under operating conditions. Based on the Mohr - Coulomb ideal elastic - plastic model with which cement soil piles to strengthen subgrade of heavy haul railway are simulated, the cement soil piles＇controlling effect on settlement and deformation of heavy haul railway subgrade, the strengthening effect of cement soil piles and the strengthening effect of reinforced cement soil piles have been studied in this article. Research conclusions： Through the numerical analysis of reinforcing heavy haul railway subgrade by cement soil piles, it is shown that ： （ 1 ） The maximum settlement of subgrade surface distributed in the center of heavy vehicle line. （2） The cement soil piles can control the settlement of subgrade surface and horizontal displacement of slope effectively, with increasing the number of rows of cement - soil piles, the constraints effect on deformation of subgrade are more obvious.（3） The piles can disperse the tensile stress and reinforced. （4） Using reinforced cement rapid reinforcement for heavy haul railway soil piles enhance the entirety of cement soil piles effectively after being is an effective method for reinforcement, which can be applied to subgrade under operating conditions