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地铁深基坑工程由于开挖深度大,受周围建筑物影响,施工难度较大。在此,结合西安地铁3号线保税区车站基坑开挖特点,对其施工方案进行分析。基坑支护采用上部放坡、喷锚支护,下部采用钻孔灌注桩加桩间挂网喷射混凝土,并采用大口井降水的方案。根据基坑水平及沉降位移变形监测结果,发现这一方案实施效果良好。
Due to the deep excavation depth of the deep foundation pit project in the subway, it is difficult to construct due to the surrounding buildings. In this connection, combined with the Xi’an Metro Line 3 Bonded Zone excavation pit excavation characteristics of its construction program analysis. The foundation pit support adopts the upper grading, spraying and anchoring support, the lower part adopts the bored piles and the concrete between the piles, and adopts the scheme of large-mouth well dewatering. According to the foundation pit level and settlement deformation monitoring results, we found that the implementation of this program is good.