红粘土渗透特性温度效应试验研究

Experimental Study on Temperature Effect of Red Clay Permeability Characteristics

采用TST-55型渗透仪和自行研制的加热装置,系统研究了南昌地区典型红粘土在27、50、65、80℃和95℃等5种温度下的渗透特性。结果表明,红粘土渗透性随着温度的上升而增大,且温度效应受试样干密度和含水率的影响;渗透系数随着初始干密度的增大呈下降趋势,且下降幅度逐步收窄;温度效应在低密度情况下非常显著,干密度增大后温度效应不再明显;不同温度下存在一个初始含水率阈值与最大渗透系数相对应,且温度越高渗透系数越大;与初始含水率相比,初始干密度对渗透系数的影响更为显著。

The permeation characteristics of typical red clay in Nanchang area at the temperature of 27,50,65,80℃ and 95℃are systematically studied by using TST-55 permeation instrument and self-made heating device.The results show that,(a)the permeability of red clay increases with the increase of temperature,and the temperature effect is affected by the dry density and water content of the sample;(b)the permeability coefficient decreased with the increase of the initial dry density,and the decreasing range gradually narrowed;(c)the temperature effect is very significant in the case of low density,and the temperature effect is no longer significant after the dry density increased;(d)there is an initial moisture content threshold corresponding to the maximum permeability coefficient at different temperatures,and the higher the temperature is,the greater the permeability coefficient is;and(e)compared with the initial moisture content,the initial dry density has more significant influence on the permeability coefficient.