省道308线多年冻土区热棒路基效果监测方案探讨

Discussion on Monitoring Scheme of Heat Pipes Subgrade of No.308 Provincial Highway in Permafrost Areas

省道308线公路是连接玉树地震灾区和国道109线的主要交通枢纽,项目的实施对完善青海省青南地区公路网建设、促进藏区经济发展具有重要意义。公路沿线多年冻土工程地质条件复杂,平均海拔在4000m以上,多年冻土地温普遍较高,高含冰量冻土发育。在极差工程地质条件地段,增设热棒路基,保护多年冻土路基的稳定。热棒路基首次在省道308线多年冻土公路工程中应用,因此,有必要在运营阶段对多年冻土区热棒路基效果进行监测。本文总结了该区的地质条件区划和多年冻土特征,结合热棒工作原理,通过地温和变形等试验、监测方法,来实现对热棒路基效果的评价,为以后多年冻土区热棒路基的建设以及运营管理工作提供科学依据。

as the main transport hub connecting Yushu earthquake area and No. 109 national highway, No. 308 provincial highway has great significance in completing highway network construction of southern Qinghai and promoting economic development of Tibetan areas. With an average elevation of more than 4000 meters, the engi- neering geological condition along the No. 308 provincial highway is complicated. In this area, permafrost has char- acteristics of high ground temperature and high ice content. As a result, the heat pipes subgrade is constructed to protect permafrost. For it is the first time to use heat pipes subgrade in the construction of No. 308 provincial highway in permafrost areas, the effect of heat pipes subgrade should be monitored. In this paper, through summarizing the geological condition and characteristics of permafrost in this area, combining with working principles of heat pipes, the effect of heat pipes subgrade is estimated, which provides scientific proof to the construction and opera- tion management of heat pipes subgrade in permafrost areas afterwards.