EKG电极真空–电渗处理软黏土室内试验研究

针对真空–电渗法在软基处理中存在金属电极易腐蚀,试验后期排水效率低等问题,利用自主研发的装置试验了EKG电极在电渗法、真空预压法、真空–电渗法、阴极直排式真空–电渗法下的排水效果,通过监测排水量、电流、pH值、沉降和处理后的强度等指标将上述方法进行比较,结果表明:(1)真空–电渗法处理后排水量最大,沉降更明显,土体强度更大;(2)阴极直排法在前8 h,排水量高于双侧排水真空–电渗法,土体内pH值更稳定,土体表面更均匀;阴极直排法能在一定时间内改善传统真空–电渗法在阳极真空预压与电渗相互抑制的情况,如果将阴极直排法与双侧排水真空–电渗法相结合,能够为扩大真空–电渗联合法的应用范围提供新的研究思路。

Soil Reinforcement Experiment Inside Large-Scale Bucket Foundation in Muddy Soil

The large-scale bucket foundation with 30 m in diameter and 6 m in height was used as the foundation of wind turbine. The wide-shallow foundation is different from the traditional bucket foundation with high ratio of height to diameter. The cover-load-bearing mode of the new type foundation can resist more external loadings. To achieve the bearing mode, the muddy soil inside the bucket should be reinforced, which will improve the soil strength and make the soil and foundation into a whole part to resist the external loadings. The vacuum and electro-osmotic soil reinforc- ing methods were used in the experiments. The results showed that the bearing behavior of the muddy soil were effec- tively improved by the negative pressure and electro-osmotic effect, and the improved muddy soil with better strength could work together with the bucket foundation, meaning that the top-cover bearing mode of the new bucket founda- tion was achieved. During the soil reinforcing process, the foundation moved downward, i.e., the settlement of founda- tion was almost finished during the pre-loading process caused by the vacuum and electro-osmotic method.