含盐量对软黏土电渗排水影响的试验研究

Experimental study on effect of soil salinity on electro-osmotic dewatering in soft clay

为了研究土体含盐量对软黏土电渗排水的影响,在自制的试验槽里进行室内一维试验,利用试验数据从排水量、排水速率、能量消耗、含水率和电化学反应等5方面对电渗性状进行对比分析。试验结果表明:含盐量对软黏土电渗性状有着明显影响,并存在最佳含盐量;较高的含盐量不利于电渗排水和含水率降低,而且会导致能量消耗、阳极腐蚀量和电渗后酸碱不平衡较大;能量消耗系数、阳极腐蚀百分比和排水速率与电流强度的比值这3者都与土体含盐量存在一定的定量关系。试验结果能为判别电渗的工程适宜性提供一定的参考依据。

A one-dimensional laboratory test program is conducted to study the effect of soil salinity on electro-osmotic dewatering in soft clay.Five indexes including discharge,dewatering rate,coefficient of energy consumption,reduction in water content and electro-chemical reaction are compared to analyze the electro-osmotic characters of different saline clays.The results show that the soil salinity has obvious effect on the electro-osmotic dewatering in soft clay and there is an optimal salinity for some type of clay.A higher salinity will lead to larger energy consumption,more anode corrosion and larger variation of pH value,while a lower salinity is better for drainage and reduction of water content.Moreover,there is some quantitative relationship between the coefficient of energy consumption and the soil salinity,and percent of anode corrosion and ration of drainage rate to current intensity are similar to coefficient of energy consumption.It may provide some reference for judging the suitability of electro-osmotic dewatering in practice.