超载作用下低路堤地基稳定性模型试验研究  

Model Test and Research on Stability of Low Embankment Foundation under Overloading Actions

作　　者：刘大鹏[1,2] 杨晓华[2] 王婧[1] 杜峰 LIU Da-peng;YANG Xiao-hua;WANG Jing;DU Feng(Jiangsu Vocational Institute of Architectural Technology,Xuzhou 221116,China;School of Highway,Chang'an University,Xi'an 710064,China;Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology,Xuzhou 221116,China)

机构地区：[1]江苏建筑职业技术学院,徐州市221116 [2]长安大学公路学院,西安市710064 [3]江苏建筑节能与建造技术协同创新中心,徐州市221116

出　　处：《公路》2021年第9期87-93,共7页Highway

基　　金：江苏省教育厅自然科学基金重大项目,项目编号18KJA560001;徐州市科技计划项目,项目编号KC17156;江苏青蓝工程资助项目;江苏建筑节能与建造技术协同创新中心开放基金项目,项目编号SJXTY1508;西部交通建设科技资助项目,项目编号2011318797600。

摘　　要：为研究超载作用下低路堤地基的稳定性,建立了1∶1足尺低路堤结构模型,进行了峰值为50kN的标准轴载和峰值为70kN的超载作用10万次的模型试验,对比分析了应力和应变的变化规律。试验结果表明:在峰值为50kN的标准轴载和峰值为70kN的超载长时作用下,低路堤各深度处的应力和各结构层的应变均会出现累积现象;荷载作用次数一定,峰值为70kN的超载作用下的应力及应力累积增量均为峰值为50kN时的1.4倍。峰值为70kN的超载作用下的应变均大于峰值为50kN时的应变,且随着荷载作用次数的增加,两者之间的应变差值逐渐增大,超载将会引起更大的沉降。依据模型试验结果,基于临界动应力视角,提出了超载作用下低路堤地基稳定的条件。文中研究成果为低路堤地基的稳定性验算提供了一种思路。In order to study the stability of low embankment foundation under overload,a 1∶1fullscale structure model of low embankment is established,and 100,000times model tests are carried out with the peak value of 50kN and the peak value of 70kN.The change rules of stress and strain are compared and analyzed.The test results show that:under the standard axle load with the peak value of 50 kN and the overload with the peak value of 70kN for a long time,the stress and the strain of low embankment will accumulate;the stress and the increment of stress accumulation under the overload with the peak value of 70kN are 1.4times of that with the peak value of 50kN.The strain under the overload with the peak value of 70kN is greater than that under 50kN.With the increase of the number of load,the difference between the two strains increases gradually,and the overload will cause greater settlement.According to the model test results,the stability conditions of low embankment under overload are proposed based on the critical dynamic stress.The research results in this paper provide a concept for the stability check of low embankment foundation.

关 键 词：低路堤 超载 地基 临界动应力 稳定性 

分 类 号：U416.1[交通运输工程—道路与铁道工程]