真空预压联合电渗加固高塑性软土的试验研究

为处理常规排水固结法难以处理的高塑性软土,进行了真空预压联合电渗加固的大比尺室内模型试验研究。试验首先对塑性指数为26～29的高塑性软土进行真空预压的加固,待固结度达到80%后启动电渗进行加固。试验中对电流、电势和表层沉降等进行了全面的监测。试验结果表明电极反转、间歇通电技术有利于提高电能的利用率。土体强度由加固前的0～7.1kPa增长到加固后的18.2～26.2kPa。后期电渗对强度增长的贡献十分明显。

Laboratory Test on Improving High Plasticity Soft Soil with Vacuum Preloading Combined Electroosmotic

It is difficult to improve high plasticity soft soil with conventional drain consolidation methods such as vacuum preloading or surcharge preloading. Large scale laboratory test was conducted to study the feasibility of improving this kind of soft soil with vacuum preloading combined electroosmotic. The vacuum preloading was used to improve the soft soil firstly. When the consolidation degree reached 80G, the electroosmotic started. The current, electric potential and surface settlement was monitored in the test. The result revealed that pole reversal and intermittent current were effective to improve the efficiency of the power. After the test, the strength of the soil increased from 0-0. 7 kPa to 18. 2-26.2 kPa and the electroosmotic was very helpful to improve the strength in the later stage of the test.