青藏铁路透壁通风管通风路基模型试验及初始温度场特征  

Simulated Experiment of the Embankment with Perforated Ventilation Pipes and the Features of Its Initial Temperature Field of the Qinghai-Tibet Railway

作　　者：胡明鉴[1] 汪稔[1] 孔令伟[1] 葛修润[1] 石祥锋[1] 黄明奎[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学重点实验室,湖北武汉430071

出　　处：《冰川冻土》2004年第5期582-586,共5页Journal of Glaciology and Geocryology

基　　金：中国科学院知识创新工程重大项目(KZCX1 SW 04);中国科学院武汉岩土力学研究所前沿基金项目(Q000207)资助

摘　　要：通风路基作为一种积极主动保护冻土路基的冷却调控技术能有效的抬升多年冻土上限,保护冻土路基的稳定性.目前实体试验工程通风路基一般采用路基内预埋实体混凝土管或PVC管,管壁不能透风,管壁与土体间主要通过热传导进行换热.一种管壁开孔、可以透风的新型通风管———"透壁通风管"既能以管内空气间的对流带走管内热量;因其管壁透风,低温的冷空气可以透过管壁的大孔眼穿透到通风管周围的介质中,直接与其进行热交换,从而改善传统通风管换热模式.为探索透壁通风管在青藏铁路路基中的实际温控效果而进行了青藏铁路透壁通风管路基现场试验,试验路基短期监测资料的分析结果显示,透壁通风管对青藏铁路路基具有良好的冷却能力,可在一定程度上抬升冻土上限;Ventilation cooling railway embankment, as an initiative-cooling embankment, attracts more and more attention. It can upgrade permafrost table, protect the embankment in permafrost regions effectively and enhance the stability of the railway foundation. At present the ventilation pipes are generally made of concrete or PVC, and without holes on their walls. Due to airflow and heat transference through air in the pipes and the soil around them, the cooling effect of this simplex mode is low at a certain extent. A new type of ventilation pipes perforated ventilation pipes is invented, which have holes on the pipe walls. Through these holes the embankment with perforated ventilation pipes can be cooled through convection heat between airflow and soil around the pipes as well as airflow and heat transference. In order to understanding the cooling effect of the perforated ventilation pipes, a in-situ contrast experiment between the ordinary ventilation pipes and the perforated ventilation pipes was carried out. Short-term observation shows that the perforated ventilation pipes are more capable than the ordinary ventilation pipes in railway embankment cooling, upgrading the permafrost table more efficiently. With embankment structure optimizing the cooling ability will exert sufficiently. It is believed that long-term cooling effect of the perforated ventilation pipes will come out as continuous observation and further analysis.

关 键 词：路基 透壁通风管 模型试验 温度场特征 

分 类 号：U213.14[交通运输工程—道路与铁道工程]