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为了分析共同管沟深基坑边坡的变形规律及其对邻近建筑物的影响作用,以三星深基坑工程为例,采用数值模拟分析并进行现场变形监测验证。结果表明:降水措施对深基坑开挖引起的水平位移作用不大,而对竖向位移作用较大;随着深基坑开挖深度的不断加大,边坡土体的水平位移和竖向位移总体呈现增大的趋势,最大水平位移值表现为从坡脚向坡脚上方移动;原地下水位线以上所开挖边坡的最大竖向位移都发生在坡脚处,采用降水措施后,原地下水位线以下所开挖边坡的最大竖向位移出现在原地下水位附近。现场变形监测与数值模拟计算结果吻合度较高,说明土体参数的选取合理。研究成果可提升城市共同管沟深基坑建设安全设计及施工水平、降低工程风险损失。
In order to analyze the deformation law of the deep pit excavation in the common trench and its influence on the adjacent buildings, take the Samsung deep excavation engineering as an example, using numerical simulation analysis and field deformation monitoring verification. The results show that: the precipitation measure has little effect on the horizontal displacement caused by excavation of the deep foundation pit, but has a greater effect on the vertical displacement; with the deepening of the deep excavation depth, the horizontal displacement and vertical of the slope soil body The overall displacement presents an increasing trend. The maximum horizontal displacement value appears to move from the foot of the slope to the top of the slope. The maximum vertical displacement of the excavated slope above the original groundwater level line occurs at the foot of the slope. After adopting the precipitation measure, The maximum vertical displacement of the excavated slope below the original groundwater level line occurs near the original groundwater level. The degree of coincidence between the on-site deformation monitoring and numerical simulation results is high, indicating that the selection of soil parameters is reasonable. The research results can improve the safety design and construction level of the construction of deep foundation pits in the city’s common trenches and reduce the risk of project losses.