基坑开挖对相邻建筑基础影响的计算分析

The fintie element analysis of pit excavation impact on the foundation surrounding buildings

如何准确的分析基坑对其相邻建筑物基础的影响,将直接关系到相邻建筑物的安全与基础支护成本的高低。通过以珠海某基坑工程为例进行三维ANSYS有限元模拟分析,分别考虑了已有邻近桩桩间距和已有邻近桩存在形式对基坑开挖的位移场影响。得出结论认为已有桩的桩间距对基坑开挖的影响很大,已有桩的桩间距越小,已有桩桩间土拱效应愈明显,土体侧向荷载分担比越大,对基坑开挖的基坑支护也就越有利。在对已有桩为单排桩和多排桩形式的模拟分析结果进行比较时发现,当已有桩基础为多排桩时,基坑支护体系上的受力要比已有桩基础为单排桩时小得多。

How accurate analysis of foundation pit affect its adjacent buildings, will be directly related to the cost of security and basic support level adjacent buildings. Project in Zhuhai excavation by a three-dimensional example ANSYS finite element analysis, respectively, consider the impact of the displacement field and has been near the adjacent pile pile spacing exists in the form of excavation. Concluded that the pile spacing has a significant impact on the excavation of the pile, pile spacing has smaller piles, there are piles of soil arching effect between the more obvious, soil spreading load sharing ratio, the for excavation excavation also more favorable. When comparing the existing pile was found in a single row of piles and piles in the form of multi-row simulation r^sults, when the existing pile foundation for multi-row when piles, excavation force than the existing system on the basis of the pile smaller single row of piles.