寒区铁路路基微型盾构置换方法及防冻胀效果  

Railway Subgrade Replacement Method by Micro⁃shield in Cold Regions andIts Anti⁃Frost Heaving Effects

作　　者：王鹏程 WANG Pengcheng(Railway Engineering Research Institute,CARS,Beijing 100081,China;State Key Laboratory for Track System of High-speed Railway,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]高速铁路轨道系统全国重点实验室,北京100081

出　　处：《铁道建筑》2024年第4期85-89,共5页Railway Engineering

基　　金：中国铁道科学研究院集团有限公司基金(2023YJ222)。

摘　　要：针对寒区铁路路基冻胀整治难题,以我国一寒区铁路路桥过渡段冻害整治工点为依托,介绍了一种可在运营条件下实施的路基微型盾构置换方法。基于数值计算软件建立了环境-路基-盾构置换层-地基的多层结构水热力耦合模型,采用数值计算方法分析路基内部水分场、温度场、冻胀变形场的影响机理及演化规律,验证了盾构置换层所起冷屏障层、水分阻滞层、零冻胀填料夹层等预期效应。综合现场测试和计算结果分析,论证了微型盾构置换方法用于路基冻害整治的有效性与实用性。In response to the problem of railways subgrade frost-heave treatment in cold regions,a micro-shield replacement method that can be implemented under operational conditions was introduced,based on a frost damage remediation project in a railway bridge transition section in a cold region.A multi-layer structural hydrothermal coupling model of environment-subgrade-shield replacement layer-foundation was established based on numerical calculation software.The influence mechanism and evolution law of the internal moisture field,temperature field,and frost-heave deformation field of the subgrade were analyzed using numerical calculation methods,and the expected effects of the cold barrier layer,moisture blocking layer,and zero frost-heave filling interlayer of the shield tunneling replacement layer were verified.Based on the analysis of field tests and computational results,the effectiveness and practicality of the micro-shield replacement method for subgrade frost damage remediation are demonstrated.

关 键 词：铁路路基 冻胀整治 数值计算 微型盾构 温度场 演化规律 

分 类 号：U213.1[交通运输工程—道路与铁道工程]