Water content.

This paper presents the design and construction of vacuum preloading incorporated with electroosmosis (VPE) engineering application for the treatment of soft soil on complex terrain for sluice foundation excavation in order to reduce the amount of cement used in construction. Monitoring was conducted during the VPE treatment and laboratory geotechnical tests were carried out once the treatment came to an end. Results show that the electrification mode has a significant influence on electric energy consumption. Stepped-up voltage helped in saving electric energy while electrode conversion consumed a lot of electric energy. The dispersion of soil parameters became larger after VPE treatment. The stability of physical parameters is better than the mechanical parameters, and the latter is better than the deformation parameters. Soil water content has a linear relationship with density and compression coefficient. The given linear fitting equations can help in simplifying the calculation and acquisition of these indexes. Although the mean values of the soil index parameters slightly improved, their coefficient of variation (COV) significantly increased. These locations with improved index parameters scattering in the construction site ensured that the subsequent construction tasks such as pit slope and excavation were successfully realized in this area.

本文针对复杂地形下水闸基坑开挖工程中的软土地基处理问题，提出了真空预压联合电渗（Vacuum Preloading Incorporated with Electroosmosis，VPE）的工程应用设计与施工方案，以降低施工过程中的水泥用量。在VPE处理过程中开展了现场监测，待处理结束后完成了室内岩土试验。试验结果表明，通电模式对电能消耗具有显著影响：逐级升压有助于节约电能，而电极转换则会消耗大量电能。经VPE处理后，土体参数的离散程度有所增大。土体物理参数的稳定性优于力学参数，力学参数的稳定性又优于变形参数。土体含水率与密度、压缩系数呈线性相关关系，本文给出的线性拟合方程可简化上述指标的计算与获取流程。尽管土体指标参数的平均值略有提升，但其变异系数（Coefficient of Variation，COV）显著增大。施工现场中土体指标参数得到改善且呈离散分布的区域，保障了该区域后续基坑边坡与开挖等施工任务的顺利完成。