Analysis and practice of influence of synchronous excavation of adjacent foundation pits in Shanghai area
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摘要: 现代城市地下空间的开发模式由空间独立、功能单一正在向区域连通的综合开发模式转变,基坑工程在深度、面积增大的同时,也越来越多呈现区域性集中开发的特点。受诸多条件限制,很多大型项目通常采用分期分块实施,形成基坑群工程。基坑群中,相邻基坑同步开挖会大大节省工期,且两侧基坑同步开挖卸载有利于围护体变形控制,但需要在两基坑间设置一定宽度的留土（缓冲区）。采用数值模拟方法,以背景工程为基础模型,研究上海典型软土地区不同缓冲区宽度条件下,围护墙后土压力分布规律,提出了相邻基坑同步开挖合理的缓冲区宽度取值范围。同时结合工程实例,对施工超载对相邻基坑同步开挖的影响情况进行了分析。Abstract: The development mode of underground space in modern cities is changing from independent space and single function to a comprehensive one of regional connectivity. The depth and area of foundation pits increase, showing the characteristics of regional centralized development. Due to many conditions, many large-scale projects are usually implemented in phases and blocks. After setting up soil (buffer) between them, the adjacent foundation pits can be excavated simultaneously. The synchronous excavation will greatly save the construction period and facilitate the deformation control of the enclosure. Numerical simulation methods are mainly used, and the background engineering is used as the basic model to analyze the force and deformation trends of the enclosure with different buffer widths. On this basis, a reasonable buffer width range for the synchronous excavation of the adjacent foundation pits in Shanghai area is proposed. At the same time, combined with engineering examples, the influence of construction overload on the simultaneous excavation of adjacent foundation pits is analyzed.
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图 3 相邻基坑同步开挖分析模型
Figure 3. Analysis model for synchronous excavation of adjacent foundation pits
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图 4 不同缓冲区宽度,缓冲区侧围护体土压力分布
Figure 4. Different buffer widths and distribution of earth pressure on side enclosure of buffer zone
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图 5 缓冲区宽度对内外侧围护体受力变形影响
Figure 5. Influences of width of buffer zone on deformation of inner and outer enclosures
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图 6 开挖至基底围护体的侧向位移
Figure 6. Lateral displacements of enclosure after excavation to base
表 1 模型参数汇总表
Table 1 Physical parameters of model soils
土层编号 E50/MPa Eoed/MPa Eur/MPa m r0.7/10-4 Rinter ①1 8.4 4.2 42 0.8 1 0.75 ② 14.0 7.0 70 0.8 1 0.75 ④ 5.2 2.6 26 0.8 1 0.75 ⑤1 8.6 4.3 43 0.8 1 0.75 ⑥ 14.0 7.0 70 0.8 1 0.75 ⑦1 20.2 10.1 101 0.8 1 0.75 ⑦2 25.6 12.8 102 0.8 1 0.75 
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