基坑工程对邻近建筑物附加变形影响的分析

Analysis of the influence of excavation engineering on additional deformation of adjacent buildings

随着软土地区城市建筑密度的增加,基坑工程周围通常存在建筑物,基坑工程的开挖受到更严格的环境制约。在深基坑工程的设计中,必须考虑基坑开挖引起的附加变形满足周边建筑物提出的严格要求,基坑设计的关键从强度控制转变为变形控制。结合上海地区大量基坑工程实践,考虑邻近建筑物条件下基坑开挖的数值模拟分析,总结出适用于基坑围护选型阶段的实用计算分析方法,对方案选型进行指导。分别结合邻近桩基础和浅基础的不同基础形式建筑物的工程实例,对基坑开挖产生的邻近建筑物的附加变形进行计算分析,并与实际工程实施的监测结果相比较,验证了计算分析的必要性和可靠性,为类似基坑工程的设计和施工提供了有益的参考。

With the increase in building density in the city of soft soil district,there are often buildings around the deep-pit projects. It results in strict environmental constraints on deep excavation. It is mandatory to consider that the additional deformation brought by excavation can meet the strict requirements of the surrounding buildings in the design of deep pit project. So pit design is restricted by deformation control other than strength control. Corresponding calculation and analysis method using FEM is brought forward based on the numerical simulation analysis of the deep excavation adjacent to buildings. Calculations and analyses of the additional deformation brought by excavation to the surrounding preservation architectures are made towards the different preservation forms between pile foundations and shallow foundations. The calculation and analysis are also compared with the in-site testing results,so the necessity and reliability of calculation and analysis are validated,which provides a useful reference to the design and construction of similar deep excavation projects.