多年冻土区通风管路基温度特性现场试验分析

摘要

According to data from test embankment with ventilation pipe of No .214 National Highway in permafrost region ,it is found that ground temperatures of embankment with ventilation pipe change with depth ,width ,and time .And the main conclusions are as follows :Temperature of natural soil and soil from embankment center changes similarly with each other ,and in embankment center ,with a deeper active layer than natural soil .With a wide range temperature dropping ,the annual temperature of lower surface of embank‐ment changes less than that of upper surface .And with similar variation periods ,ground temperatures distrib‐ute as sine curve .However ,different thermal states of embankment result in asymmetric thermal regime in south faced slope and north faced slope .%结合国内修筑在多年冻土区的G214线的通风管路基现场试验段测试结果，分析了通风管路基典型部位的温度随深度、宽度和时间的变化情况。结果表明：天然土体和路基中心处的温度在四季中随着深度的增加呈现的变化规律基本相同，但是路基中心处的活动层厚度较天然土体更深；路基下表面年温度变化幅度较上表面小，降温幅度较明显；路基不同位置处的地温年变化近似呈正弦状分布，且地温周期大致相同，但阴阳坡土体温度场呈现不对称性。