青海省共和-玉树高速公路新建块石路基下的温度状况分析

发布时间：2018-03-05 00:14

本文选题：共和-玉树高速公路　切入点：块石路基　出处：《冰川冻土》2014年04期 　论文类型：期刊论文

【摘要】：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.
[Abstract]:Block rock subgrade is the most widely used permafrost subgrade form in permafrost region. In this paper, the measured data of the monitoring sections of the three block subgrade of the newly built Gonghong-Yushu Expressway in Qinghai Province are selected. The temperature state of permafrost in the initial period of subgrade construction is analyzed. The results show that at the beginning of subgrade construction, there is still seasonal variation at 0.5 m below the original natural surface in the center of the subgrade, and it reaches the upper limit depth of the original permafrost. The thermal insulation effect of rock embankment is closely related to the annual average ground temperature. The lower the annual average ground temperature, the more significant the protective effect of frozen soil is. The temperature of left shoulder / foot of slope is higher than that of right shoulder / foot of slope. The upper limit of permafrost under left and right shoulder and center hole can be raised to some extent, and the range of uplift is mainly affected by the height of roadbed, which is not necessarily related to the annual average ground temperature of permafrost.
【作者单位】：中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室;
【基金】：国家自然科学基金创新群体项目(41121061)资助
【分类号】：U416.1

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