既有铁路路桥过渡段路基测试与分析  

Embankment Test of Bridge Transition Section and Data Analysis in Existing Railway

作　　者：祝建农 

机构地区：[1]中铁上海设计院集团有限公司,上海200070

出　　处：《华东交通大学学报》2011年第5期98-103,共6页Journal of East China Jiaotong University

基　　金：国家自然科学基金(50908086);江西省教育厅课题(GJJ11441);中铁上海设计院集团公司科研项目(80110014)

摘　　要：提出了既有线路基状态在运营条件下测试的方法,并在现场进行了相关测试。测试数据表明,轨枕端头处的动态变形模量值(Evd值)和轻型动力触探锤击数(N10)大于路肩上测得的相应值,改良土在道砟下层粗砂的保护下可以较长时间保持较高的承载力与动态变形模量。动态变形模量与N10有一定的相关关系,对N10可以正常测试的情况,其线性相关性非常显著,而当N10是通过换算得出时,线性相关性不显著。讨论了过渡段的加固与不加固的控制标准,结合实例说明当Evd值满足要求时,基床底层仍有可能存在软弱层,建议用Evd值和N10值综合评价过渡段是否进行加固。A security test method in running existing railway is proposed firstlya,nd then is used in related tests.Test results show that dynamic deformation modulus（Evd value）and light dynamic penetration blow count（N10）at head sleeper are greater than road shoulder,which indicates that improved soil can maintain a high ca-pacity and dynamic deformation modulus for a long time under the coarse sand protection.There is a certain cor-relation between Evd and N10.The linear correlation is very significant when N10 can be measured directly,and the linear correlation is not significant when N10 can not be measured directly which obtained through the conver-sion.Reinforcement and non-reinforcement control standards are discussed.With examples,weak layer under-lying subgrade may still exist when Evd value meets the requirement,so combination of Evd and N10 is proposed to decide whether the transition section need reinforcement or not.

关 键 词：既有铁路 过渡段加固 动态变形模量 N10 相关系数 

分 类 号：U212[交通运输工程—道路与铁道工程]