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结合青藏铁路清水河试验段试验,研究通风管路基的温度特性,根据通风管路基基底1m范围内和边坡位置及冻土上限位置热量周转和通风管内外温度,分析通风管路基对保护多年冻土的有效性。研究结果表明:青藏高原严寒的气候为通风管的适用性提供了环境条件;在路基中埋入通风管,不但增加了路基与空气的接触面,而且通过高原空气的强对流活动,消耗路基体中存在的热量,有效阻止路基表面吸收的辐射热量下传,起到了保护下伏多年冻土维持冻结状态的作用;通风管路基作为青藏高原多年冻土区的一种新结构形式,为青藏铁路的建设和安全运营提供了技术支撑。
According to the experiment of Qingshuihe experimental section of Qinghai-Tibet Railway, the temperature characteristics of ventilated pipe embankment are studied. According to the heat turnover and the temperature inside and outside the ventilating pipe within 1m base of ventilating pipe subgrade and on the position of slope and the upper limit of permafrost, Effectiveness of soil. The results show that the cold climate in Qinghai-Tibet Plateau provides environmental conditions for the applicability of ventilation ducts. Burying the ventilation ducts in the embankment not only increases the contact surface between the embankment and air, but also consumes the convective body through the strong convection of plateau air Which effectively prevent the radiant heat absorbed by the subgrade surface from being transmitted, and plays a role in protecting the frozen permafrost. The ventilation pipe subgrade is a new structural form of the permafrost region on the Qinghai-Tibet Plateau, The construction and safe operation provided technical support.