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冰川冻土  2014 

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

DOI: 10.7522/j.issn.1000-0240.2014.0117, PP. 969-975

Keywords: 共和-玉树高速公路,块石路基,温度状况,阴阳坡效应,多年冻土上限

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Abstract:

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0.5m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.

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