Analysis of large-diameter shield cutting through anti-slide pile and its effect on embankment deformation
This study analyzed the disturbance effect on embankment of large-diameter shield cutting through the anti-slide piles,with the goal of ensuring the safety and stability of the levee during the process of shield tunneling.A three-dimensional numerical model of tunnel-pile foundation-embankment was established using finite element analysis software.The settlement of the levee and the deformations of piles during shield tunneling were analyzed,and the deformations of piles under different shield thrust were compared.Results showed that the cutting of anti-slide piles by shield machine caused great disturbance to the upstream slope of the levee.The largest longitudinal displacement occurred at the top of the slope,and the soil around the piles showed obvious settlement.Under the influence of the shield thrust and landslide thrust,the anti-slide piles were characterized by flexure deformation,which formed a slanting"S"curve.The deflection of the anti-slide piles were 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.The displacement of the pile bottom increased by 162％when the cutter head approached the pile foundation.Therefore,when a shield machine cut through anti-slide pile,the construction parameters such as the advancing speed and mud-water pressure should be strictly controlled to reduce the adverse effect of shield thrust on the pile.
万方数据
维普
