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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。
The thickness of landslide body, the thrust of landslide and the resistance of formation in different parts of the slope are different, so the setting of anti-slide piles should also be different everywhere, that is, variable stiffness piles should be adopted. There are four types of variable stiffness anti-slide pile: vertical stiffness of pile body, inconsistent pile spacing in horizontal direction, inconsistent pile spacing in vertical direction and inconsistent size of each pile section. In order to simulate the thickness of landslide and the inhomogeneity of landslide thrust distributed in the horizontal direction, a three-dimensional model of anti-slide pile reinforcement slope is established. Erected thin-layer rock walls are set on the left and right sides of the model, Compared with the case without the boundary of the rock wall, it is found that the landslide is unevenly distributed in the horizontal direction after setting the boundary of the rock wall, which is close to the actual situation. The characteristics of the anti-sliding pile with variable stiffness in the transverse deformation and pile bending moment of the pile are studied. Compared with the anti-sliding pile with the same stiffness, the superiority of the anti-sliding pile with reinforcement is also demonstrated.