青藏铁路低温热管应用的能量基础条件  

Fundamental energy conditions of the application of low-temperature heat pipe in Qinghai-Tibet railway

作　　者：郭宏新[1,2] 原思成[3] 张鲁新[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,兰州730000 [2]江苏中圣高科技产业公司,南京211112 [3]北京交通大学土木建筑工程学院,北京100044

出　　处：《东南大学学报（自然科学版）》2009年第5期967-972,共6页Journal of Southeast University：Natural Science Edition

摘　　要：针对青藏铁路冻土路基工程中广泛应用的低温热管,研究了其工作的能量条件和工作效果.依据观测数据对低温热管的降温效果进行了分析研究,并采用有限元方法,在实测数据作为边界条件的基础上对低温热管的30年长期工作效果的变化趋势进行了数值模拟研究.对实测数据的分析以及数值模拟计算的结果都反映出相同的趋势:热管的应用有效地降低了土体温度,并在长期工作中能够持续降低土体温度.研究表明,在气温升高趋势下,低温热管应用于寒区工程的能量基础条件未有重大改变,并能够在30年的寿命期内持续地发挥作用,使应用这种热管的冻土区路基工程热稳定性得到保证.Low-temperature heat pipe is widely applied for stabilizing the permafrost foundation of Qinghai-Tibet railway. The mechanism and fundamental conditions of its application are analyzed. A field test of cooling effect of heat pipe was conducted to study the energy conditions of typical cold region and structural characteristics of heat pipe. A numerical simulation by finite element method with the actually measured boundary conditions is carried out to predict the thirty years long term cooling of heat pipe in permafrost foundation. All results show that the heat pipe lowers the soil tem- perature effectively at the beginning and can keep lowering the temperature continuously in a long period. Thus the conclusion can be drawn that the fundamental energy conditions of the application of low-temperature heat pipe in permafrost region would not change severely under the background of global climate warming-up, and the heat pipe will be able to keep working during all its life of thirty years, ensuring the stability of the permafrost foundation.

关 键 词：青藏铁路 低温热管 多年冻土 数值计算 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]