不同电势梯度下新型复合电极的电渗固结试验

Experimental research of composite electrode on electro-osmoticconsolidation under different voltage gradient

通过自行研制的新型复合电极(CCF),采用大连地区的海相软土,探讨在不同电势梯度下该电极的电渗排水效果.对有效电势、排水量等进行监测,通过求解得出排水速率、能耗等与加固效果相关的参数,对电渗加固性能进行分析,测算加固后的土体含水率,分析含水率变化与加固效果的关系,建立电流与排水速率,能耗与排水量间的关系.利用袖珍触探仪估算加固后的土体承载力,分析电势梯度对加固性能的影响.试验结果表明:当电势梯度为1 V/cm时,新型复合电极的有效电势占比达到61.7%,有效电势占比最高.同时,电渗排水速率能够长期保持较高值,且最终的土体承载力最大值达到253.2 kPa,其中,加固土体承载力高于160 kPa的占比约为79%,且承载力均在120 kPa以上,加固效果明显优于其他电势梯度下的电渗排水固结试验.

The research proposed a composite electrode(CCF)to investigate its behaviors under different voltage gradient on marine clayey soils collected from Dalian City.A series of experimental tests were conducted to obtain the effective voltage and water discharge during the consolidation process.The water discharge rate,dewatering efficiency were determined to analyze the effectiveness of the electro-osmotic consolidation.The water contents of the tested soils were measured to analyze the relationship between the water content and the consolidation performance.The relationships between current and water discharge rate,energy consumption and water discharge,were established in this study.The bearing capacity of the soil was determined using a pocket probe meter to further analyze the consolidation effectiveness of the proposed method.The analysis results demonstrated that,when the voltage gradient is 1 V/cm,the effective voltage accounted for 61.7%of the total voltage,and the water discharge rate remained at a high value.The maximum bearing capacity of the soil was up to 253.2 kPa,and the area of the soil at which the bearing capacity was higher than 160 kPa accounted for 79%of the total area of the tested soil.The best consolidation effectiveness for the soil was shown at the voltage gradient of 1 V/cm.