粉土持水性能的温度效应研究

发布时间：2018-05-21 07:53

  本文选题：持水特征曲线 + 温度　； 参考：《岩土力学》2014年S1期

【摘要】：开展3种不同温度作用下粉土的持水特征曲线(SWRC)试验,测量脱湿过程中土体的体积变化,修正体变对体积含水率的影响。试验结果表明,在减湿过程中粉土体积发生明显收缩,孔隙比由0.675降低到0.645左右,不同温度作用下的最终孔隙比相差仅为0.003,说明粉土的变形对温度不是很敏感;温度对粉土持水性能影响显著,粉土的进气值随着温度的升高而降低;基质吸力为50 kPa时,不同温度下粉土持水性能差异达到最大值,20℃、30℃、40℃时的体积含水率分别为0.397、0.361和0.338;粉土的体积含水率随温度越高逐渐减小,但彼此之间的差异随着温度升高而逐渐减弱。孔隙中水的物理特性以及水、气的赋存状态是不同温度下粉土持水性能存在差异的主要原因。
[Abstract]:The water holding characteristic curve of silty soil under three different temperatures was tested by SWRC to measure the volume change of soil and the effect of modification on volume moisture content during dehumidification. The results show that the volume of silt shrinks obviously, the void ratio decreases from 0.675 to 0.645, and the difference of final void ratio under different temperature is only 0.003, which indicates that the deformation of silt is not sensitive to temperature. The influence of temperature on the water holding capacity of silt is significant, the inlet value of silt decreases with the increase of temperature, and the suction of the substrate is 50 kPa. The water holding capacity of silty soil reaches the maximum value at 20 鈩，

本文编号：1918368