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根据基坑开挖工况、地质条件和环境要求和抽水试验制定坑内降水方案,对上海地铁四号线董家渡段地层塌陷隧道进行原位修复降水。采用承压含水层降水三维渗流与土体变形控制耦合数值模型进行数值模拟,模型参数由现场抽水试验确定,模拟结果与施工中实际数值吻合较好。采用降水综合控制信息图反映水位、沉降、开挖深度及流量历时变化,有效地保护了基坑临近建筑物。
Based on excavation conditions of excavation, geological conditions and environmental requirements and pumping tests, a scheme of in-pit precipitation was established to repair in-situ precipitation in the subsidence tunnel of Dongjiadu section of Shanghai Metro Line 4. The coupled numerical model of three-dimensional seepage and soil deformation control of confined aquifer was used to conduct numerical simulation. The model parameters were determined by on-site pumping test. The simulation results were in good agreement with the actual values in construction. Adopting precipitation comprehensive control information map to reflect the change of water level, settlement, excavation depth and flow time, effectively protecting the foundation pit near the building.