Researching test and model on thermal conductivities of typical lithologics in Mu Us Sandy Land | 毛乌素沙地典型岩性导热系数试验和模型研究
2010
Zhao Guizhang, Chang’an University, Xi’an (China), College of Environmental Science and Engineering | Wang Wenke, Chang’an University, Xi’an (China), College of Environmental Science and Engineering | Li Yunliang_, Chang’an University, Xi’an (China), College of Environmental Science and Engineering
chinois. 研究毛乌素沙地4种典型岩性的导热系数与含水率之间的关系。根据毛乌素沙地岩性特征和沉积环境不同，制定了相应的试验方案，利用JW-Ⅲ型热流计测定不同含水率条件下的导热系数，利用Campbell模型和赵贵章模型分析了毛乌素沙地典型岩性的导热系数与含水率之间的变化规律及其拟合误差。毛乌素沙地4种典型岩性中砂质壤土和风化砂岩的导热系数-含水率变化曲线呈线性，而风积沙和莎拉乌苏组的导热系数-含水率变化曲线基本呈非线性。Campbell模型对各种岩性导热系数曲线的拟合均呈线性，而用赵贵章模型可很好地反映参数的变化特征。赵贵章模型拟合的不同岩性导热系数-含水率变化曲线的相关系数均大于0.97，而均方根差均小于0.005。利用赵贵章等提出的导热系数和含水率模型能很好地反映参数的变化特征，可见该模型的拟合精度可以满足要求。
Afficher plus [+] Moins [-]anglais. The research studied the relationship between thermal conductivity and water content of four kinds of typical lithologics in Mu Us Sandy Land. According to different lithologic characteristics and sediment environment, we suggested a new test method. Meanwhile we measured thermal conductivity under different water contents using the JW-Ⅲ heat flow meter. By analyzing the differences between thermal conductivity and water content in Mu Us Sandy Land, and making use of the new model provided by campbell and the author, the measured thermal conductivities of all kinds of lithologics and fitting error were analyzed. According to the analysis, the new model suggested by the author was used to fit the measured thermal conductivity-water content curves. The model can greatly reflect the characteristics of parameters, the related coefficients of measured values and fitted values are bigger than 0.97.
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