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块石路基是多年冻土区应用最为广泛的多年冻土路基形式.为了研究多年冻土区修筑高速公路后块石路基的效果,选取青海省新建共和-玉树高速公路3个块石路基监测断面的实测资料,对路基修筑初期多年冻土温度状况进行了分析.结果表明:路基修筑初期路基中心原天然地表下0.5 m处仍表现出季节变化规律,至原多年冻土上限深度处,温度波动幅度急剧减小.块石路基的保温效果与年平均地温密切相关,年平均地温越低,对冻土的保护效果越显著.受阴阳坡效应的影响,左路肩/坡脚温度高于右路肩/坡脚.左右路肩及中心孔下多年冻土上限都得到不同程度的抬升,抬升幅度主要受路基高度影响,与多年冻土年平均地温没有必然关系.
Block stone embankment is the most widely used form of permafrost embankment in permafrost.In order to study the effect of block embankment after the construction of expressway in permafrost region, three block embankment monitoring sections of Qinghai New Gonghe-Yushu Expressway , The temperature of permafrost in the initial period of subgrade construction was analyzed.The results show that the subgrade at the initial subgrade 0.5m below the original natural surface still shows the seasonal variation at the initial depth of the permafrost and the temperature fluctuates And the amplitude decreases sharply.The thermal insulation effect of block rock embankment is closely related to the annual average ground temperature.The lower the annual average ground temperature, the more significant the protective effect to the frozen soil.The temperature of the left shoulder / The slope of permafrost below shoulder and center hole has been raised to varying degrees, which is mainly affected by the height of subgrade, and is not necessarily related to the annual mean ground temperature of permafrost.