基坑宽度效应对坑底隆起的影响研究

Study on Influence of Pit Width Effect on Bulge at Bottom of Pit

该文通过不同宽深比基坑坑底隆起的数值模拟,分析了基坑宽度效应对坑底隆起的影响。研究揭示了不同宽深比基坑坑底隆起变形的规律,表明随着基坑宽深比的不断增加,坑底最大隆起量不断增大。结合上海东西通道上跨地铁二号线的工程实例分析,指出对环境保护要求极高的宽大基坑,可通过将大基坑划分为小基坑的方式有效地控制坑底隆起。

The article analyzes the infuence of the pit width effect on the bulge at bottom of pit through the numerical simulation of bulge at the bottom of the pit with the different width depth ratio.The study opens out the rule of the bulge deformation at the bottom of the pit with the different width depth ratio,and makes clear that the maximum bulge level at the bottom of pit will continuously increase with the continuous increment of the pit width depth ratio.Combined with the engineering case analysis of Shanghai East-West Passage overpassing Metro No.2 Line,the article points out that the wide and large pit with the utmost high requirement of environmental protection can efficiently control the bulge at the bottom of pit by the mode of dividing the large pit into the small pit.