桩网结构加固土质路基的离心机模型试验研究  

Centrifugal Model Test Study on Soil Subgrade Reinforced by Column-net Structure

作　　者：蒋泽中[1] 肖宏[2] 蒋关鲁[1] 龚成明[1] 

机构地区：[1]西南交通大学,成都610031 [2]北京交通大学,北京100044

出　　处：《铁道工程学报》2013年第11期18-22,56,共6页Journal of Railway Engineering Society

基　　金：铁道部科技研究开发计划项目(2005K004-C(G))资助

摘　　要：研究目的:本文通过两种典型布桩方式进行离心模型试验,对采用桩网结构加固土质路基的原理及工程应用效果进行系统探讨,并对遂渝铁路高路堤情况下无砟轨道桩网结构土质路基的桩土相互作用及沉降特征进行分析。研究结论:研究结果表明:(1)桩网结构中的网(加筋垫层)具有荷载分担作用,桩起竖向增强作用,桩的承载力中侧阻占绝大部分,桩主要表现为摩擦桩的特征;(2)桩间距对桩网结构路基的累积沉降影响显著,该工程桩间距宜取为2 m,桩网结构路基累积沉降值及工后沉降值较小,能满足无砟轨道的要求;(3)研究结果对高速铁路路基处理设计新方法的选择有一定的指导意义。Research purposes ： According to centrifugal model test on two types of column - net structure, reinforcement principles and engineering effects of soil subgrade reinforced by column - net structure are studied. Also under circumstances of high embankment in Suiyu Railway project, pile - soil interaction characteristics settlement characteristics of soil subgrade of baliastless track column - net structure are analyzed. Research conclusions： The research results indicate： （1） The geosynthetie reinforcement layer can partially afford bearing capacity but the columns make ground strengthen. The frictional resistance is main in the bearing capacity of the columns and the columns belong to frictional type pile. （2） The distance between adjacent two columns has important effect on the settlement of the subgrade. The distance can be 2 m that is proposed by the test results. The column - net structure can make accumulative settlement during construction and settlement after construction smaller. It can adapt to the ballastless track railway project. （3）These results may give references to subgrade design in express railway projects.

关 键 词：离心机模型试验 桩网结构 土质路基 加筋垫层 沉降特征 

分 类 号：U213.2[交通运输工程—道路与铁道工程]