【摘要】 为建立热导率与影响因素间的确定性关系和推算公式,需要严格的实验,即研究某一影响因素时应保持其他因素不变。在严格控制其他各影响因素的情况下,分别研究了土体热导率随含水量(保持孔隙率、土样成分等不变)及随孔隙率(保持含水量、土样成分等不变)的变化规律,在此基础上再对影响因素的综合影响进行研究。并从微观的角度分析土体热导率的变化规律,研究其内在传热机制。分析发现,土样种类不同,热导率随含水量及孔隙率的变化规律也不同,同时还发现土体内部粘粒含量是表征热导率递变速率发生明显变化的重要因素。给出了土体热导率的经验公式,将该公式计算值与工程土体的实验值进行对比后发现,两者间相对误差较小,该公式可直接应用于实际工程。更多还原

【Abstract】 In order to build precise relationship between thermal conductivity and influencing factors,strict experiments are required.Other factors should be kept constant while the effect of an influencing factor is examined.The effects of moisture content(with constant porosity and composition of soils) and porosity(with constant moisture content and composition of soils) were examined individually.Based on these results,the general relation between thermal conductivity and moisture content and porosity was analyzed at the micro level.And the heat transfer mechanism of soils was studied to explain the present results.It is found that the soils of different type follow different relation,and that the content of clay particles is a very important factor to illustrate the obvious change of thermal conductivity.The empirical relations were presented,for predicting the conductivity of all above soils,and their efficiency was established by comparing with the experimental results of soils in engineering.更多还原