降雨入渗对黄土拓宽路基变形影响的离心模型试验  

Centrifuge model test of influence of rainfall infiltration on deformation in loess widened subgrade

作　　者：段丹军 杨烜宇 DUAN Danjun;YANG Xuanyu(Shanxi Transportation Technology Research&Development Co.,Ltd.,Taiyuan 030032,China)

机构地区：[1]山西省交通科技研发有限公司,山西太原030032

出　　处：《交通科学与工程》2023年第4期17-23,46,共8页Journal of Transport Science and Engineering

基　　金：山西交通控股集团有限公司科技项目(19-JKKJ-4)。

摘　　要：为探究降雨入渗对黄土拓宽路基造成与一般路基的变形差异,该研究以典型黄土路基及其拓宽路基为研究对象,建立离心试验模型,研究在降雨入渗条件下典型黄土路基及其拓宽路基的变形情况,同时监测这两种路基内部含水率及土压力的变化情况。研究结果表明:在降雨入渗作用下,典型黄土路基顶面中心位置的沉降变形最大,而拓宽路基路肩位置的沉降变形最大,随着降雨量的增加,变形增加幅度逐渐变小;拓宽路基坡脚位置与地基均出现隆起变形,路基边坡中部位置内陷;路基内部含水率存在动态平衡过程,影响路基整体变形。To explore the influence law of rainfall infiltration on widening deformation in loess subgrade,and reveal the deformation differences between loess widened subgrade and general subgrade under the action of rainfall infiltration.This paper takes typical loess subgrade and widened loess subgrade as the research object,and the centrifuge test model was established to study the deformations of typical loess subgrade and widened loess subgrade under the condition of rainfall infiltration.The changes was monitored for water content and soil pressure inside the two subgrades.The results showed that the settlement deformation was the largest at the top surface center position for the typical loess subgrade under the action of rainfall infiltration,while the settlement deformation at the shoulder was the largest for the widened subgrade.With the increase of rainfall,the increasing extent of deformation gradually decreased.The foundation at the slope foot of widened subgrade was uplifted and deformed,and the central position of subgrade slope was invaginated.There was a dynamic equilibrium process of water content in subgrade,which affects the overall deformation of subgrade.

关 键 词：道路工程 降雨入渗 黄土路基 拓宽路基 离心模型试验 沉降变形 

分 类 号：U416.1[交通运输工程—道路与铁道工程]