考虑承压水降水的深基坑施工变形规律研究

Deformation law of deep foundation pit construction considering pressure precipitation

以宁波市轨道交通仇毕站深基坑工程为例,考虑⑧3层承压水降水的影响,开展了深基坑开挖施工变形特性研究.首先设计了减压降水方案,然后利用Plaxis3D有限元软件对仇毕站深基坑开挖施工进行数值模拟,分析减压降水对深基坑工程变形特性的影响.结果表明:考虑基坑承压水降水的深基坑变形规律与不降水条件下的变形规律基本一致,⑧3层承压水减压降水可导致地表沉降增大,坑底隆起减小.

Taking the deep foundation pit project of Qiubi station of Ningbo rail transit as an example, the deformation characteristics of deep foundation pit excavation is studied by considering confined water precipitation of ⑧3 layer. Firstly, the design of decompression precipitation scheme is carried out, and then the construction of deep foundation pit is simulated by Plaxis 3D finite element software, and the influence of decompression precipitation on engineering deformation characteristics of deep foundation pit is analyzed. The results show that the deformation law of deep foundation pit is consistent with that of non-precipitation condition. The pressure water decompression precipitation can lead to the increase of surface settlement and the decrease of bottom uplift.