青藏铁路含保温夹层路基的模型研究

Study on the model of the Qinghai-Tibet railway roadbed on permafrost with insulation

青藏铁路大多数路段位于多年冻土区,在铁路建设及运营期间遇到的主要问题是冻土病害,此问题会给铁路运营带来风险.选用什么结构的路基成为了国际冻土界及工程师一直研究的课题.针对含保温夹层的路基建立了数学模型,并分析了填料层导热系数对保温层厚度的影响.结果表明:填料层的导热系数越小,保证路基稳定所需保温层的厚度也越小.

In terms of Qinghai - Tibet railway,one of the major problems is permafrost which poses great challenge for railway operations. As most sections of this railway are built on the central part of permafrost, the choice of roadbed structure has long been a hot topic for permafrost researchers and engineers at home and abroad. Through building a mathematical model on the roadbed with insulation,the paper makes an analysis that how the thermal conductivity of the packing layer will affect the thickness of the insulation layer. Results show that the smaller the thermal conductivity is,the thinner the insulation layer is required.