关键词: 深基坑, 最大侧移深度, 基坑变形, 建筑物不均匀沉降, 土体位移???

Abstract: The depth where the maximum lateral wall deflection occurs during excavation is one of the key indicators for evaluating excavation deformations. To date, there are few studies involving the relationships between the depth of the maximum lateral wall deflection and the adverse influences on adjacent environment. Based on analysis of field monitoring data and finite element numerical simulations, the influences of depth of the maximum lateral wall deflection on both ground displacement and uneven settlement of buildings adjacent to excavation are investigated. It is found that the deeper the location of the maximum lateral wall deflection, the wider the ground displacement field and the greater the uneven settlements of buildings. The soil strata undergo various vertical displacements at different depths, and the displacement patterns are governed by depth of the maximum lateral wall deflection. As the maximum lateral wall deflection goes downwards, the ground displacement field of soil adjacent to pit extends to deeper level and the corresponding influence zone expands as well. The investigation results indicate that the excavation-induced adverse effects on adjacent environment could be mitigated effectively by controlling the location where the maximum lateral wall deflection occurs.

Key words: deep foundation pit, depth of maximum lateral deflection, excavation deformation, uneven settlements of buildings, ground displacement