富水圆砾地层超深地下连续墙参数优化及施工控制技术研究

依托昆明轨道交通火车北站深大基坑的工程实例，运用理正深基坑软件模拟基坑开挖和回筑全过程，计算深大基坑地下连续墙的内力、位移，对富水圆砾地层深大基坑地下连续墙的变形规律进行研究，并对地下连续墙的结构参数进行优化比选。分析研究得出:对于富水圆砾地层采用分层开挖方法及内支撑体系，其深度达到35.0 m的深大基坑，地下连续墙嵌入深度建议值为35.0 m，厚度建议值为1.5 m，并满足整体稳定性、抗倾覆、抗隆起、抗管涌验算要求。同时，针对性地提出了富水圆砾地层地下连续墙施工控制技术。

Study on Optimization of Parameter and Construction Control Technology of Ultra-deep Underground Diaphragm Wall in Water-soaked Round Gravel Strata

Based on the engineering example of deep and large foundation pit of Kunming North Railway Station of Kunming Rail Transit, the whole process of excavation and reconstruction of foundation pit is simulated by Lizheng deep foundation pit software. The internal force and displacement of underground diaphragm wall of deep and large foundation pit are calculated. The deformation law of underground diaphragm wall of deep and large foundation pit in water-soaked round gravel strata is studied, and the structural parameters of underground diaphragm wall are optimized. The analysis result shows that for the water-soaked round gravel strata, the layered excavation method and the internal support system is adopted. For the deep and large foundation pit which depth reaches 35.0 m, the recommended value of embedding depth of underground diaphragm wall is 35.0 m, and the recommended thickness is 1.5 m. It meets the requirements of overall stability, anti-overturning, anti-uplift and anti-piping. Based on the above results, the construction control technology of underground diaphragm wall in water-soaked round gravel strata is proposed.