温度对黄土水力学参数的影响研究

摘要

为探讨温度变化对黄土水力学参数的影响，利用自制的变温下饱和－非饱和水力学参数测定装置结合理论探讨，分析了不同温度下黄土的渗透系数、比容水量和扩散的变化规律。结果表明：黄土的饱和渗透系数随着温度的增加而递增，冻融交替循环次数也是影响饱和渗透系数的重要因素；黄土非饱和渗透系数和扩散率是温度和含水率的函数，而比水容量是含水率的函数。水动力黏滞系数随温度增加而减小是上述参数增大的关键因素。%This paper tries to understand the effect of temperature on hydraulic parameters of loess.It conducts a combined study of the measurement device for determining hydraulic parameters of saturated-unsaturated soils under variable temperature and theoretical analysis.It examines the variation of the permeability coefficient parameters, the water capacity and the diffusion rate due to temperature changes.The results show that the temperature has a significant effect on the saturate permeability coefficient parameters and that the freeze-thaw cycle times are the important factors influencing the saturated permeability coefficient.The unsaturated permeability coefficient and diffusion rate of loess are the function of temperature and moisture content,while the water capacity is a function of moisture content.Hydrodynamic viscous coefficient decreases with the increase of temperature which is a key factor on the increase of the above parameters.