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研究目的:青藏铁路穿越连续多年冻土区546.43km,防止多年冻土融沉是青藏铁路路基工程设计施工面临的首要技术难题。为指导设计与施工,在青藏铁路多年冻土区工程大规模施工前,在具有代表性的北麓河、清水河、安多3个试验段,先期进行片石气冷、片石及碎石护坡、热棒、通风管路堤等主动保护多年冻土路基结构的试验研究。研究结论:片石气冷、片石及碎石护坡、热棒、通风管路堤通过改变路基的结构和填料,调节辐射、对流、传导所传输的能量,增加多年冻土地基的冷储量,改善多年冻土地基的热状况,防止多年冻土地基融沉,是保护多年冻土的有效工程措施,适用于多年冻土区路基工程。青藏铁路格拉段多年冻土区路基长380.30km,其中片石气冷、碎石护坡、路基设置热棒的长度分别为117.69km、127.00km、32.0km。青藏铁路主动保护多年冻土路基结构试验工程至少已经过6个冻融循环,未发现路基融沉病害;2006年7月后,多年冻土区列车以100km/h速度的平稳运行,证明了经主动保护的多年冻土路基结构稳定可靠。
Research purposes: The Qinghai-Tibet Railway traverses a continuous permafrost zone of 546.43km. Preventing thawing of permafrost is the primary technical challenge for the design and construction of the Qinghai-Tibet Railway embankment. In order to guide the design and construction, before the large-scale construction of the permafrost project on the Qinghai-Tibet Railway, three test sections, Beiluhe River, Qingshuihe River and Anduo, Experimental Study on Active Protection of Permafrost Subgrade with Hot Rod and Ventilation Pipe Embankment. The research conclusions are as follows: air-cooled stone tablet, stone tablet and gravel slope, hot rod and ventilation pipe embankment can improve the permafrost by changing the structure and filling of subgrade, adjusting radiation, convection and conduction energy, increasing cold storage of permafrost foundation The thermal status of the soil foundation to prevent the permafrost foundation from melting is an effective engineering measure to protect the permafrost and is suitable for subgrade construction in permafrost regions. The permafrost embankment in the Gela section of Qinghai-Tibet Railway is 380.30km long, of which 117.79km long, 127.00km long and 32.0km long, respectively, are covered by gas-cooled rock, gravel revetment and subgrade-mounted hot rods. The Qinghai-Tibet Railway took the initiative to protect permafrost embankment structure of the pilot project has been at least 6 freeze-thaw cycles, found no sinking Shenji disease; July 2006, the permafrost trains at 100km / h speed of the smooth operation of that The permafrost embankment structure proactively protected is stable and reliable.