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

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.

Analyzing the temperature regime within the block stone embankment of the newly constructed Gonghe-Yushu Expressway in Qinghai Province

Block stone embankment is a most widely used roadbed form in permafrost regions. To study the impact of newly constructed embankment on the underlying permafrost in cold regions, data monitored at three monitoring sections along the newly constructed Gonghe-Yushu Expressway in Qinghai Province are selected, and the initial temperature regions are analyzed. The results show that the thermal insulation effect of block-stone embankment is closely related to mean annual ground temperatures of the permafrost. The lower the temperature is, the more efficient the embankment will be. Due to the sunny-shady slope effect, the temperature of the left shoulder/foot is always higher than that of the right shoulder/foot. The permafrost tables under the left shoulder, the right shoulder and the central of the embankment are all raised; the magnitude of the uplift is mainly affected by the height of the embankment, having little thing to do with the mean annual ground temperature of the permafrost.