双排抗滑桩上滑坡推力近似解析方法

An approximate analytical method for calculating thrust on double-row stabilizing piles

双排抗滑桩是加固大型滑坡的常用工程措施之一,在实际工程设计计算中的关键环节在于简单且合理地确定作用于前后排桩上的滑坡推力。将抗滑桩受荷段前侧坡体视为水平向的温克勒(Winkler)地基,基于弹性地基梁模型,并充分考虑桩体受荷段与锚固段的变形连续性,通过迭代算法确定出后排抗滑桩受荷段前侧坡体抗力,进而可对排间坡体采用传递系数法计算出前排桩桩后滑坡推力,给出了相关的理论计算公式。通过室内模型试验验证了所提方法的合理性,并针对一大型基覆式滑坡实例,具体计算出了前后排桩上的设计滑坡推力荷载。所提计算方法可为实际工程的简化设计提供参考。

Double-row stabilizing piles are employed commonly to stabilize large-scale landslides. The key in the design and calculation of practical engineering is to simply and reasonably determine thrust on the front and rear piles. The rock or soil mass in front of loading section of a pile is considered as the Winkler foundation. Using the elastic foundation beam model and fully considering the deformation continuity between loading segment and anchorage segment of the pile, slope resistance on the loading segment of the rear pile can be determined by iterative algorithm. Then, the thrust on the loading segment of the front pile can be figured out using transfer coefficient method for potential slide mass between the front and rear piles. The relative theoretical formulas are given. To verify the rationality of the proposed method, a laboratory model test is conducted. The results are acceptable. For a large-scale landslide example, design slide thrust on a rear or front pile is figured out in detail respectively. The proposed method can provide a reference for the simplified design of practical projects.