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为解决季节性冻土区路基结构因冻解破损而发生的各种病害,利用地源热泵系统改变路基结构温度场。以109国道青海省季节性冻土区路基为研究实例,运用ANSYS模拟分析109国道季节性冻土区原始温度场,并分析了地源热泵路基的工作原理及运行效果;介绍了地源热泵系统形式及设计计算中的有关问题,得出地源热泵路基系统的设计参数;利用ANSYS有限元法对地源热泵路基的水平埋管进行模拟分析,通过对比分析得出路堤中水平埋管宜分2层布置(-1 m处埋置4根,每管间距为2 m;-3.5 m处埋置5根,每管间距为4 m)。在上述设计方案下,该地区在全年最冷时刻路基易发生冻胀区域的地温超过0℃。通过模拟分析得出,地源热泵路基是一种新型路基结构,该系统对于防治季节性冻土路基冻胀病害具有积极作用。
In order to solve the various diseases occurred in the subgrade structure of seasonal frozen soil area due to frost heaving and breakage, the ground source heat pump system is used to change the temperature field of subgrade structure. Taking the Qinghai Province 109 National Highway subgrade as a case study, the author uses ANSYS to simulate and analyze the original temperature field of the 109 national highway permafrost region and analyzes the working principle and operation effect of the ground-source heat pump subgrade. The ground source heat pump system Form and design of the calculation of the relevant issues, derived ground source heat pump subgrade system design parameters; using ANSYS finite element method of ground source heat pump submerged horizontal embankment simulation analysis, through the comparative analysis of the embankment horizontal pipe should be points Two-layer arrangement (four at -1 m, with 2 m spacing between each tube; 5 buried at -3.5 m with 4 m spacing). Under the above design scheme, the ground temperature in the frost heaving zone in the subgrade at the coldest time of the year exceeded 0 ℃. Through simulation analysis, it is concluded that the ground-source heat pump subgrade is a new subgrade structure which has a positive effect on the frost heave prevention and control of seasonal frozen soil subgrade.