双基坑开挖对中间既有建筑物的影响

Influence of Double Foundation Pit Excavation on Existing Intermediate Buildings

以某基坑开挖工程为研究背景,通过MIDAS/GTS分析双基坑同时开挖和单独依次开挖时对中间建筑物的影响机制。研究结果表明:单独依次开挖相对于同时开挖,基坑围护结构变形最大位移值比同时开挖少了45%左右,建筑物筏板沉降位移值比同时开挖多了50%~111%左右。通过数据模拟分析出两种不同开挖方式对建筑物的最不利位置,比较出两者的差异,优化施工步骤,从而保证建筑物的安全。本双基坑开挖的研究可为此类工程提供参考。

With a foundation pit excavation project as the research background,MIDAS/GTS is used for an analysis of the impact mechanism of simultaneous excavation and sequential excavation of double foundation pits on the intermediate buildings.Research shows that compared with simultaneous excavation,the maximum deformation displacement of the foundation pit enclosure structure has been reduced by about 45%,with the settlement displacement of the building raft increased by about 50%~111%compared with that of simultaneous excavation.Based on a data simulation analysis,the most unfavorable positions of two different excavation methods on the building can be identified,with compared differences between the two so as to optimize the construction steps to ensure the safety of the building.The research on the excavation of double foundation pits can provide reference for similar projects.