软土地区狭长深基坑分区开挖对邻近建筑物沉降影响研究

为研究狭长型的地铁车站深基坑分区开挖是否能作为邻近建筑物沉降变形的有效控制措施，以佛山地铁3号线叠滘站深基坑工程为依托，收集整理其分区开挖时周边建筑物沉降变形的监测数据，同时建立车站深基坑分区开挖和整体开挖时的三维有限元模型，对比分析分区开挖对控制周边建筑物沉降变形的影响。研究结果表明： 狭长型基坑开挖对邻近基坑长边中间处的建筑物沉降变形影响显著；通过设隔断墙分区开挖，能充分发挥基坑的空间效应，减小“长边效应”对建筑物沉降变形的影响。

Influence of Partitioned Excavation of Deep Narrow Foundation Pit on Settlement of Neighboring Buildings in Soft Soil Area

To verify whether partitioned excavation can effectively control the settlement of adjacent buildings when constructing the deep foundation pit of long narrow metro station, building settlement adjacent to the foundation pit of Diejiao station in Foshan metro line 3 is collected and sorted out. Meanwhile, three dimensional finite element models for partitioned excavation and overall excavation of deep foundation pit are established and the settlement of the two methods are compared. The results show that if the foundation pit to be constructed is long and narrow, settlement of the building adjacent to the middle of the long side of foundation pit is obvious, but if the foundation pit is districted with dividing walls, the space effect of foundation pit can be fully developed and the influence of "long side effect" on the settlement of surrounding buildings can be reduced.