变刚度抗滑桩性状研究

边坡中各处的滑坡体厚度、滑坡推力、地层抗力等不同，则各处抗滑桩的设置也应有所不同，即应采用变刚度布桩。变刚度抗滑桩有竖向上桩身刚度不一致、横向上桩间距不一致、纵向上桩排距不一致及各桩截面大小不一致四种类型。为模拟滑体的厚度和滑坡推力在横向上分布的不均匀性，建立了抗滑桩加固边坡的三维模型，在模型的左右两侧设置竖立的薄层岩壁，并对设置岩壁边界与未设置岩壁边界的情形进行了比较，发现设置岩壁边界后，滑坡在横向上呈不均匀分布，与实际情况接近。研究了变刚度抗滑桩在桩横向变形、桩弯矩等方面的特性，并与等刚度抗滑桩进行了比较，显示了变刚度抗滑桩加固边坡的优越性。

Study on the Characteristics of Anti-sliding Pile with Variable Stiffness

There are different gliding mass thickness, landslide thrust, stratum resisting force existing in slope, so the arrangement of anti-sliding piles should be different, that is, the anti-sliding piles with variable stiffness should be adopted. The anti-sliding piles with variable stiffness are piles which have inconsistent pile shaft stiffness distribution in vertical direction, inconsistent pile spacing in transverse direction, inconsistent pile row spacing in longitudinal direction and have different pile cross section among piles. In order to simulate the nonuniformity of gliding mass thickness and landslide thrust in transverse direction, three dimensional model for reinforcing slope of the anti-sliding piles are established, and set vertical rockwall boundary at left and right side of the model and compare with the situation without the rockwall boundary. It is founded that the 3D models with rockwall boundary are in compliance with the actual. The characteristics of the anti-sliding piles with variable stiffness including pile transverse deformation and pile bending moment are studied, and are compared with the anti-sliding piles with constant stiffness. It is founded that the anti-sliding piles with variable stiffness have superiority.