气候变暖条件下青藏铁路抛石路基的降温效果

被引：54

作者：

赖远明

张鲁新

张淑娟

米隆

不详

机构：

[1] 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室

[2] 北方交通大学土木工程系兰州

[3] 兰州

[4] 北京

来源：

科学通报 | 2003年 / 03期

基金：

国家杰出青年科学基金;

关键词：

气候变暖; 青藏铁路; 抛石路基; 降温效果;

D O I：

暂无

中图分类号：

U216 [铁路养护与维修];

学科分类号：

摘要：

根据多孔介质中流体热对流的连续性方程、动量方程和能量方程,应用伽辽金法导出了多孔介质对流换热的有限元公式,并对传统道碴路基和抛石路基在未来50年青藏高原气温上升2.0℃情况下的温度变化进行了预报分析和比较.计算结果表明,在年平均气温大于-3.5℃或天然地表温度大于-1℃的地区,传统道碴路基以下5m内的冻土将会融化,路基将产生很大的融沉,对铁路造成很大的破坏.而抛石路基除了能抵消气候变暖的影响外,还能对路基下的冻土制冷,保证冻土路基的稳定,不至于使冻土融化.因此大力推荐该种路基作为青藏铁路高温冻土区的路基结构,以便最大限度地保护冻土区的铁路.

引用

页码：292 / 297

页数：6

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