Through establishing numerical analysis model,it analyzes and forecasts footbridge pile foundation ground surface settlement across shield tunnel between Xi＇an subway No.1 line Beidajie station-Wulukou station.Calculation results show that the existence of pile foundation prevents the extension of subsider in width in some points.If the two lines are not excavated at the same time,it will leads to certain inclination of the footbridge.It suggests that preventive measures should be taken in construction.The maximum ground surface displacing value is-10 mm,which is in safe domain.Therefore,it is unnecessary to carry on grouting reinforcement for ground layer.%通过建立数值分析模型分析预测了西安地铁一号线北大街站到五路口站区间隧道盾构施工旁穿人行过街天桥桩基础的地表沉降,计算结果显示,桩基的存在一定程度阻止了沉降槽宽度方向上的扩展;两条线路不同时开挖,可能导致天桥有一定量倾斜,建议施工时做好预防应急措施。地表最大竖向位移值为-10 mm,处于安全可控范围之内,因此不需要对地层进行注浆预加固处理。
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