冻土热物性参数的确定方法及热响应测试研究进展

针对目前工程界较多采用经验判断和工程类比方法确定冻土热物性参数的现状,总结了热物性参数的4种确定方法及各自优缺点,介绍了热响应测试的方法及原理,论述了地层中柱状换热器与岩土体热量交换过程的两种数学模型,并对比分析了估算热物性参数的3种方法。认为冻土区道路工程的地质勘察内容应包括冻土的热物性和初始温度,建议推广现场热响应测试,并采用合适的估算方法确定热物性参数值,以保证路基和热棒设计的合理性。

Research Development on Method Determining Thermophysical Properties Parameters of Frozen Soil and the Thermal Response Test

In relation to the status quo in the engineering circle that the thermophysical parameters are determined by means of empirical judgment and engineering analog in most cases,this paper summerized 4 methods determining thermophysical properties parameters with their respective advantages and disadvantages,introduced the method and principle of thermal response test,discussed the two mathematical models of heat exchange process between columnar heat exchanger in the strata and rock-soil mass,and compared 3 methods estimating such parameters.It is thought that the geological survey for road engineering in permafrost regions should involve thermophysical properties and initial temperature of frozen soil,and suggested to popularize on-site thermal response test and use proper estimation method to determine the parameter values and then ensure the rationality of subgrade and heat pipe design.