立体排水-电极联合体处理高含水率废弃土的试验研究

Experimental Study on the Treatment of Waste Soil with High Water Content by the Combination of Solid Drainage and Electrode

针对高含水率废弃土的自身特点,提出了一种适用于超软土加固的可回收立体排水-电极联合体,并根据立体排水-电极联合体空间布置情况,试验设计从过程中排水量、含水率与抗剪强度、沉降变化、电势分布、电流变化以及能耗情况出发,对比分析不同条件下的土体电渗固结性状,结果表明:(1)立体排水-电极联合体增加了横向排水通道之后,缩短了排水固结路径,使土体中部维持着一个较高的电势水平,相对于传统竖向电极排水量最大提高38%;(2)增加横向排水体后抗剪强度单层式与双层式联合体分别提高3.0倍和1.5倍,且土体强度更加均匀;(3)引入了统一能耗系数概念,增加横向排水体后能耗系数从0.163降低到0.154,体现了立体排水-电极联合体的优越性。

According to the characteristics of waste soil with high water content,a kind of recyclable solid drainage electrode combination suitable for super soft soil reinforcement was proposed.According to the spatial layout of the solid drainage electrode combination,the test is designed.The water discharge,water content and shear strength,settlement change,potential distribution,current change and energy consumption,the electro osmotic consolidation of soil under different conditions were compared and analyzed.The results show that:(1)after increasing the transverse drainage channel,the drainage consolidation path is shortened,and the middle part of the soil maintains a high potential level,which increases the maximum drainage capacity by 38%compared with the traditional vertical electrode;(2)The shear strength of the single-layer and double-layer combination is increased by 3.0 and 1.5 times respectively after increasing the transverse drainage body,and the soil moisture content is increased by 3.0 times and 1.5 times respectively(3)The concept of uniform energy consumption coefficient is introduced to reduce the energy consumption coefficient from 0.163 to 0.154 after adding horizontal drainage body,which reflects the advantages of three-dimensional drainage electrode combination.