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.

余杭软土地区大面积基坑工程的施工技术与优化的研究

针对余杭地区遇到的湖沼积、冲洪积、冲海积平原区地貌以及长达半年的汛期,探索并形成了一套行之有效的基坑施工技术和相关的优化方案。通过研究余杭区大型商业综合体在基坑开挖中所使用的主要技术措施的案例,再结合同地区在建的大体量EPC项目的地下工程施工方法作为补充,来研究淤泥质软土地质环境下的大型基坑施工技术,总结出从围护到基础施工阶段的可靠、快速的施工方法以及优化方向,以期形成在软土地质条件下的基坑施工经验和建议并运用在今后的同类工程中。