Based on the shield - tunneling project in Fuzhou Metro Line I, the construction process of shield tunnel crossing through the Xima bridge piles is carefully analyzed by numerical simulation. The pile displacements and the pile bending moments in two directions are well specified during the tunneling process. The results show that the pile displacements in transverse direction take the fashions of "bi - directional double peaks", and the anti - bending point appears near the interface of soft and hard soil, the pile displacements in longitudinal direction take the fashions of "single peak", the maximum displacements in both two directions occur at the tunnel center elevation; the pile displacement in transverse direction accumulates monotonously during the tunneling crossing, while the pile displacement in longitudinal direction increases gradually and then decrease slightly; the maximum positive bending moments in transverse direction occur at the tunnel center elevation and the negative one occur at the top of pile, the distribution of bending moment in longitudinal direction is similar to its counterpart in transverse direction, but with some smaller values.%以福州轨道交通1号线盾构隧道近接穿越洗马桥桩基工程为背景,对其施工过程进行精细化模拟,重点关注掘进过程中,邻近桩基位移与弯矩的变化规律.结果表明:桩基横向水平位移呈"双向凹凸"形态,反弯点出现在软硬土层交界面附近,纵向水平位移呈"单向鼓凸"形态,两者最大值均出现在隧道中心高程附近;在近接穿越过程中,桩基横向水平位移呈不断累计增大的趋势,而桩基纵向水平位移则呈先增大后减小的趋势;桩身横向正弯矩最大值出现在隧道中心高程处,负弯矩最大值出现在桩头连结处,桩身纵向弯矩的分布情况与之类似,但绝对值略小.
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