利用地源热泵防止季节性冻土路基冻解破损的数值分析  

Numeric Analysis for Preventing Freeze-thaw Damage of Seasonal Frozen Soil Subgrade Using Ground Source Heat Pump

作　　者：苏延桂[1] 王旭[2] 

机构地区：[1]青海大学土木工程学院,青海西宁810016 [2]兰州交通大学,甘肃兰州730010

出　　处：《公路交通科技》2014年第6期11-16,共6页Journal of Highway and Transportation Research and Development

基　　金：教育部2012春晖计划科研基金项目(Z2012088);青海大学2012中青年项目基金(QDZQ2012051)

摘　　要：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 various diseases of subgrade structure in seasonal frozen soil area due to freeze- thaw damage, we changed the temperature field of subgrade structure by using the ground source heat pump system. Based on the seasonal frozen soil region along national highway No. 109 in Qinghai Province, we simulated the original temperature field of the highway by ANSYS simulation and analyzed the working principle and operation effect of ground source heat pump subgrade. We introduced some problems of forms system form of ground source heat pump and its design calculation, and obtained the design parameters of the ground source heat pump subgrade. Using ANSYS finite element methods, we simulated the arrangement of horizontal buried tubes, through the contrast analysis, we obtained the scheme that to put the horizontal pipe structure by 2 layers, arrange 4 pipes at - 1 m position with pipe spacing of 2 m, and arrange 5 pipes at -3.5 m position with pipe spacing of 4 m. Under this design scheme, the ground temperature of the subgrade area where is prone to frost heaving is more than 0 ~C in the coldest moment throughout the year. Through the simulation analysis, we found that ground source heat pump subgrade is a new structure for subgrade, which is positive for prevention and treatment of freeze-thaw damage of seasonal frozen subgrade.

关 键 词：道路工程 地源热泵路基 ANSYS模拟 季节性 冻土 

分 类 号：U416.1[交通运输工程—道路与铁道工程]