浅埋暗挖地铁站厅洞室开挖过程物理模型试验及土体变形规律研究

 据相似材料大比尺三维概念物理模型理论，高仿真度制作了成型盾构隧道地铁站厅洞室开挖试验物理模型。模拟了双盾构隧道之间开挖站厅洞室的全过程，研究站厅洞室、横通道开挖过程中模型地表沉降，土体的变形，盾构隧道及站厅洞室周围特征点的位移。模拟并研究混凝土加固桩对土体位移的影响，总结出土体的动态力学特征和变形规律，得出一些有益的认识和结论。对研究在已建成地铁双隧道间拓展开挖站厅空间的施工具有重要的参考意义。

STUDY ON PHYSICAL MODEL TEST AND DEFORMATION LAW OF SURROUNDING SOIL FOR SHALLOW METRO STATION CHAMBER

According to conceptual model theory of equivalent material，a large-scale physical model test for excavation of metro station chamber was realized. The excavation process of connection tunnels between metro station chamber and existed double TBM tubes had also been simulated；the ground settlement，soil deformation and displacement of characteristic points around tunnels were also studied. In addition，the influences of the cast-in-place piles to reduce the soil displacement have been simulated. Dynamic mechanical behaviors and deformation laws were obtained. Some conclusions have been obtained. The results may be useful to the construction and expanding excavation of metro station space between existing double TBM tubes.