深基坑开挖对邻近既有建筑变形影响研究

Influence of Deep Excavation Induced Deformation on the Adjacent Buildings

城市建设逐步深入,深基坑工程越来越多,对于特大城市中心地区建筑物必然受到其邻近深基坑开挖施工的影响。一方面受到周围建筑与拟建基坑的最小距离的影响,另一方面受到周围建筑的建筑形式和基础形式影响。基于深圳京基东滨时代大厦基坑支护工程,通过建立深基坑开挖全过程的三维数值模型,研究深基坑开挖过程中基坑的变形及对其邻近建筑物的变形、倾斜和沉降的影响。结果表明,深基坑施工对其近距离建筑变形产生一定的影响,与高层桩基础建筑的影响相比,浅层基础受深基坑开挖的影响较大,结果显示各建筑变形指标均满足规范要求。

With the increasing number of deep excavation projects in urban area, the buildings that are adjacent to these excavations will inevitably be affected by the construction activities. The degree of the influence is affected by the minimum distance between the surrounding buildings and the proposed excavation;Also, it is dependent to the types of the existing buildings as well as the excavation. In order to further study the deep excavation induced deformation on the nearby existing buildings, the foundation excavation supporting of Shenzhen Kingkey East Coast Times Building is presented in this paper. The excavation process was three-dimensionally simulated and the deformation of the deep excavation on the adjacent buildings was investigated. The results show that the deep excavation induced deformation could influence the nearby building. Compared with the high-rise and pile supported buildings, buildings with shallow foundation are more affected by the deep excavation. The results show that all the excavation induced deformation parameters on adjacent buildings meet the code requirements.