高速铁路中低压缩性土路基工后沉降计算方法研究  

Research on Settlement Calculation Method of High-speed Railway Medium-Low Compressible Soil Subgrade

作　　者：李剑[1] 陈善雄[1] 王祥[2] 王亚飞[2] 罗强[3] 王亚威 胡耀芳 LI Jian;CHEN Shanxiong;WANG Xiang;WANG Yafei;LUO Qiang;WANG Yawei;HU Yaofang(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [2]中铁第四勘察设计院集团有限公司,武汉430063 [3]西南交通大学土木工程学院,成都610031

出　　处：《铁道标准设计》2023年第7期19-23,共5页Railway Standard Design

基　　金：铁道部科技研究开发计划项目(2010G003-F);中铁第四勘察设计院集团有限公司科研课题(2010K28)。

摘　　要：控制高速铁路工后沉降是保证高速列车安全运营的关键。为解决目前路基工后沉降计算不准确的问题,从3个方面入手,建立适宜于高铁中低压缩性土路基工后沉降的计算方法。首先,利用基于变形时间效应的压缩层厚确定方法,提高了中低压缩性土压缩层厚度的计算精度;其次,基于众多高铁中低压缩性土路基实测数据,提出适应于高铁路基柔性荷载的中低压缩性土路基总沉降修正系数ψs,以及施工期沉降完成比例η。在此基础上,通过对比3个不同实际工点的工后沉降实测数据和计算结果表明,针对中低压缩性土路基工后沉降计算方法更符合工程实际,可为高铁中低压缩性土地基处理及路基铺轨提供依据。The key element to ensure the safe operation of high-speed trains is to control its postconstruction settlement.In order to solve the current problem of inaccurate calculation of postconstruction settlement of subgrade,a calculation method suitable for post-construction settlement of subgrade of medium-low compressible soil subgrades for high-speed railways is established from three aspects.Firstly,the calculation accuracy of the compression layer thickness of medium-low compressible soil is improved by using the method for calculating the thickness of the compression layer based on the deformation time effect.Secondly,the total settlement correction factorψs and the settlement completion ratioηof the medium-low compressible soil subgrade suitable for the flexible load of the high-speed railway foundation are proposed based on the measured data of many high-speed railway medium-low compressible soil subgrades.On this basis,by comparing the measured data and calculation results of post construction settlement at three different actual construction sites,it shows that the calculation method of post construction settlement for medium-low compressible soil subgrade is more in line with the engineering practice,and can provide a solid basis for the treatment of medium-low compressible soil subgrade and track laying of high-speed railway.

关 键 词：高速铁路 铁路路基 中低压缩性土 路基沉降 沉降修正系数 完成沉降比 工后沉降 

分 类 号：U238[交通运输工程—道路与铁道工程] U213.1