基于统一强度理论多层滑坡体中抗滑桩最大桩间距研究

Maximum Pile Spacing of Stabilizing Piles in Multilayer Sliding Mass Based on Unified Strength Theory

抗滑桩是防治滑坡的重要工程措施之一,桩间距是抗滑桩设计中的一个重要参数。已有的桩间距研究主要是针对单层均质滑坡,但实际工程中多数滑坡体是多层的,因此对多层滑坡体抗滑桩桩间距的研究就显得尤为重要。在研究多层滑坡体中的抗滑桩最大桩间距时,在确定滑坡体中的最危险滑体后,考虑多层滑体相互作用,运用滑坡推力分布函数及土体抗力分布函数对最危险滑体进行了受力分析,基于统一强度理论对最危险滑体的平衡条件与土拱强度条件进行了研究,推导出了抗滑桩最大桩间距方程。最后对2个实例进行了计算,计算实例1说明了该计算方法在计算多层滑坡体中最大桩间距时,计算结果偏于安全,计算实例2厚坝滑坡验证了运用滑坡推力分布函数使最大桩间距计算结果更合理。

Stabilizing pile is one of the important engineering measures to control landslides. Pile spacing is an important parameter in designing stabilizing piles. The research of the maximum pile spacing has focused on the discussion of single-layer homogeneous landslide. But most of the landslides are multi-layered in the actual projects, and so it is very important to study the design of the multi-layer slope stabilizing pile spacing. In the research of the maximum pile spacing of the stabilizing pile in the multi-layer sliding mass, the most dangerous sliding mass in the sliding mass can be determined. Considering the interaction effect of the multi-layer sliding mass, the landslide thrust function and the soil resistance distribution function are used to analyze the most dangerous part based on the unified strength theory. Also, the equilibrium condition of the most dangerous slip body and the soil arch strength condition are studied. Finally, the maximum pile spacing equation of the stabilizing pile is deduced. The accuracy of the method is verified by the calculation of example 1 in the calculation of the maximum pile spacing in the multi-layer landslide body. The maximum pile spacing obtained by using the landslide thrust distribution function is proved to be more reasonable by Houba landslide.