摘要
多年冻土区道路的修筑 ,改变了原来天然地表与外界的热交换关系 ,引起多年冻土区冻土的融化 ,从而导致路基面破坏。本文运用有限元分析方法 ,对多年冻土区含保温夹层的路基温度场进行了数值模拟。为了检验保温材料的效果 ,计算时采用改变保温材料聚苯乙烯 ( EPS)层的厚度、宽度、埋设位置及路基表面条件 ,来模拟路基面下多年冻土季节最大融化深度在今后 5 0年内随时间的变化。通过对计算结果和多年冻土上限变化的分析比较 ,得出了在多年冻土区路基中铺设保温材料对路基面下多年冻土具有明显的保护作用 。
Roadbed construction on permafrost will substantially disturb the heat and mass transfer balance between the ground surface and atmosphere and cause local degradation of the permafrost underneath. As a result it may lead to damage of the roadbed. In this paper, the 2 D finite element analysis is conducted to simulate the thermal state of the roadbed with insulations on permafrost. To check the efficiency of the insulations by varying the thickness, the width and the position of the expandable polystyrene insulation layer (EPS) and the material of the subgrade surface in the calculation, the maximum thawed depth in the coming 50 years on permafrost under the roadbed are simulated. By comparing and analyzing the computed results and the change of the permafrost table, a conclusion is reached that the roadbed with insulations on the permafrost protects the permafrost well. The rational position and thickness for insulation are suggested.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2002年第2期59-64,共6页
China Railway Science
基金
国家自然科学基金项目 ( 40 1710 18)
铁道部科技发展基金 ( 2 0 0 1G0 45 )
关键词
冻土区
保温夹层
路基温度场
数值模拟
铁路线路
Permafrost
Insulation
Temperature field of roadbed
Numerical simulation
