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
Key words
railway subgrade/frost-heave remediation/numerical calculation/micro-shield/temperature field/evolution law
维普
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