Influence of seepage flows on embedded depth of multi-pivot diaphragm walls
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摘要: 在软土地区采用地下连续墙作为基坑围护结构的基坑工程设计中，合理嵌固深度的地下连续墙对控制支护体系造价及保证基坑工程安全具有重要的意义。在软土高地下水位的东部沿海地区，基坑降水开挖过程中渗流作用对基坑变形及内力的影响已不可忽视，国家规范对多层支撑地下连续墙嵌固深度的相关条文已越来越不适应目前的设计要求。针对此，探讨了渗流作用对软土地区多层支撑围护结构合理嵌固深度的影响，并提出了确定围护结构嵌固深度的建议控制指标，同时结合施工监测结果，在基坑开挖变形及内力分析中是否应考虑渗流作用方面得到了较好的结论。Abstract: In the eastern coastal area of China, the effect of seepage flows caused by dewatering and excavation on the pit deformation and stress cannot be ignored. The relevant terms of national norms for the embedded depth of multi-pivot supporting system have become increasingly unsuitable to the current design requirements. Aimming at this problem, the determination method for the embedded depth of multi-pivot supporting system considering the effect of seepage flows in soft soil area is discussed. The proposed controlling index to determine the embedded depth is put forward. Combined with the monitoring results, a conclusion on whether to consider the effect of seepage flows in the excavation deformation and stress analysis is drawn.
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Keywords:
- soft soil area /
- effect of seepage flow /
- multi-pivot diaphragm wall /
- embedded depth
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