Experimental Study on Force and Deformation Characteristics of Group Piles in Slope Section Bridge Under Cyclic Load
Compared with the ordinary flat pile foundation,the slope section bridge group pile foundation has more complex force environment.The dynamic response caused by dynamic load is more significant.To study the influence of cyclic loading and slope on the force and deformation of bridge piles,the series of indoor model tests of horizontal cyclic load of slope piles were designed and completed.The deformation and bending moment distribution of pile foundations were analyzed according to the test phenomena and monitoring data.The tests were finally verified by using numerical simulation for comparison to explore the force and deformation characteristics of bridge group piles under dynamic load.The result indicates that when the slope gradient is 0°,the soil range disturbed before and after the foundation pile is basically the same.The soil around pile appears circular collapse.When slope gradient≥20°,the soil failure in front of pile shows obvious bulging,the soil behind pile shows landslide cracking,and the soil range disturbed around pile increases with the increase of slope.In the same slope,the horizontal bearing capacity of slope section bridge pile foundation decreases with the increase of cyclic load number and loading level.The positive horizontal bearing capacity of group pile is weakened.The negative horizontal bearing capacity is enhanced by the increase of slope.For the group piles on flat land or slope for positive loading,the maximum value of bending moment of front row piles is larger than that of the back row piles.With the increase of cyclic load,the bending moment value of front row piles increases and that of the back row piles decreases.Due to the influence of group pile effect on force distribution between the front and rear rows of piles,the maximum soil resistance value of front row of piles is significantly larger than that of the rear row of piles.The soil resistance on pile side decreases significantly with the increase of slope.The slope effect has a greater influence on the p-y curve of pile foundation.As the slope increases from 0° to 30°,the slope of load-displacement hysteresis curve circle decreases,and the horizontal cut line stiffness decreases.
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