水平荷载作用下盘数量对柔性新型混凝土扩盘桩承载性能的研究

Study on influence of plate number on bearing capacity of flexible new concrete expansion pile under horizontal load

柔性新型混凝土扩盘桩是指当桩径较小时,在水平荷载持续作用下桩顶水平位移持续增大导致桩身产生弯曲变形的混凝土扩盘桩。柔性新型混凝土扩盘桩盘数量的变化对桩承载性能和桩周土体破坏状态将产生影响。通过原状土小比例半截面模型试验和ANSYS有限元模拟两种方法,将盘数量视为单一变量,桩为柔性桩作为研究前提,研究水平荷载作用下盘数量对桩承载能力及桩周土体破坏状态的影响,得出了柔性新型混凝土扩盘桩的水平承载力随着盘数量的增加而不断提高,但并非呈线性增长,1~3个盘数量为合理的取值范围,完善了柔性新型混凝土扩盘桩在水平力作用下的研究理论。

Flexible concrete reaming pile refers to the concrete reaming pile whose bending deformation occurs when the pile diameter is small and the horizontal displacement of pile top continues to increase under the continuous horizontal load.The change of the number of flexible concrete reaming piles will affect the bearing capacity of the piles and the failure state of the soil around the piles.In this paper,the number of disks is regarded as a single variable and the pile is a flexible pile as the research premise.The influence of the number of foot disks under horizontal load on the bearing capacity of pile and the failure state of soil around the pile is studied by using two methods,including the small proportion half-section model test of undamaged soil and ANSYS finite element simulation.It is concluded that the horizontal bearing capacity of the flexible concrete tray pile increases with the increase of the number of disks.However,it does not increase linearly,and the number of 1~3 plates is a reasonable value range,which improves the research theory of flexible concrete pile under horizontal force.