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上海10号线同济大学站至国权路站双线盾构长距离平行穿越下立交深基坑底部,穿越距离为630 m,隧道与下立交基坑地下连续墙净距约2.0 m,盾构施工导致地下连续墙围护结构产生沉降。通过比较现场监测结果和Plaxis 3D Tunnel三维有限元软件模拟结果表明:随着地下连续墙底与隧道底部的夹角Φ不断变大,地下连续墙沉降量逐渐增大,当Φ≤0°时,地下连续墙沉降量基本为零;0°<Φ≤32°时,最大沉降量为5 mm;32°<Φ≤51°,最大沉降量为40 mm;Φ>51°时,沉降量大于40 mm。以此三维模型为基础,分析在基坑底板浇筑后,盾构引起的地下连续墙的沉降。研究结果表明,底板对控制沉降效果显著,工程上应用良好。在实际施工中,通过在下立交底板施工上设置注浆孔能有效地控制盾构推进后基坑底板的沉降。
The long distance between the double line shield of Tongji University station and Guoquan Road Station on Shanghai Line 10 runs parallel to the bottom of the deep foundation pit under the interchange and travels for a distance of 630 m with a net clearance of about 2.0 m for the underground diaphragm wall of the tunnel and the underpass pit. Construction led to the subsurface diaphragm wall structure subsidence. By comparing the field monitoring results with the Plaxis 3D Tunnel 3D finite element software simulation results, it is shown that the settlement of the diaphragm wall increases with the angle Φ between the continuous underground diaphragm wall and the bottom of the tunnel increasing. When φ≤0 °, The settlement of underground continuous wall is almost zero; when 0 ° <Φ≤32 °, the maximum settlement is 5 mm; when 32 ° <Φ≤51 °, the maximum settlement is 40 mm; when Φ> 51 °, the settlement is more than 40 mm. Based on the three-dimensional model, the settlement of the diaphragm wall caused by shield after the foundation pit pouring is analyzed. The results show that the floor has significant effect on controlling settlement and good engineering application. In the actual construction, the settlement of the foundation pit after the shield propulsion can be effectively controlled by setting the grouting hole in the construction of the lower interchange floor.