为研究大直径盾构切穿护岸抗滑桩对堤岸的扰动影响, 确保盾构隧道穿越过程中大堤 的安全性与稳定性, 采用有限元分析软件建立了隧道-桩基-堤岸三维数值模型, 重点分析了盾 构切穿施工时堤岸及桩体的变形规律, 并对比了不同盾构推力下桩体的变形差异. 研究结果表 明: 盾构切削护岸抗滑桩将导致大堤迎水面边坡产生较大扰动, 坡顶出现最大纵向位移, 被切 桩周围土体出现明显下沉; 在盾构推力以及迎水面滑坡推力的双重影响下, 抗滑桩以挠曲变形 为主, 整体形成一条倾斜的 “S” 形曲线, 盾构刀盘抵近桩体时的抗滑桩挠曲变形最为明显; 盾 构推力由 0.7 倍静止土压力增至 0.9 倍, 桩身水平位移大幅增加, 盾构刀盘抵近桩基时的桩底 位移增幅高达 162%. 综上可知, 盾构切削穿越抗滑桩时应严格控制推进速度、泥水压力等施 工参数, 以减小盾构推力对堤岸及桩体的不利影响.

This study analyzed the disturbance effect on an embankment of large-diameter shield cutting through an anti-slide pile with the goal of ensuring the safety and stability of a levee during the process of shield tunneling. This paper shows how a three-dimensional tunnel–pile foundation–embankment numerical model was established using finite element analysis software. The settlement of a levee and deformation of piles during shield tunneling were analyzed, and the deformations of the piles under different shield thrust values were compared. The results showed that the cutting of anti-slide piles by a shield machine will significantly disturb the upstream slope of a levee. The largest longitudinal displacement occurred at the top of the slope, and the soil around the pile showed obvious settlement. Under the influence of the shield thrust and landslide thrust, the anti-slide pile was characterized by flexure deformation, which formed a slanting “S” curve. The deflection of the anti-slide pile was the most obvious when the cutter head of the shield machine was close to it. The thrust of the shield increased from 0.7 to 0.9 times the static earth pressure, the horizontal displacement of the pile significantly increased, and the displacement of the pile bottom increased by 162% when the cutter head approached the pile foundation. Therefore, when a shield machine cuts through an anti-slide pile, construction parameters such as the advancing speed and mud-water pressure should be strictly controlled to reduce the adverse effect of the shield thrust on the pile.