This study explores the pile-soil interaction mechanism and the optimal use of antislide piles for slope reinforcement based on finite difference numerical modelling. The force and displacement principles of slopes and antislide piles are analysed. The influences of various factors are investigated, such as postpile filling parameters, pile embedding methods, and pile cross-sectional shapes. Numerical modelling is used to determine the optimal layouts of antislide piles for push and traction landslides. The findings indicate that the cohesive force of the fill has a greater influence on the piles and slope than the friction angle and is the primary control factor. Fully buried antislide piles provide a better antisliding effect than semiburied ones. With fully buried piles, the best controlling effect is obtained when the ratio of the length of the pile’s free section to the height of the sliding body is approximately 4/5. Moreover, stepped-cross-section piles provide better slope reinforcement than those with rectangular, T-shaped, or trapezoidal cross-sections. In practical applications, end-bearing arches can be utilized as the primary control structures, with friction arches used for secondary control to improve the soil arching effect as much as possible, thereby enhancing the stability of the piles and slope. To control landslides of various thrust forms, antislide piles should be set in the active section, the core sliding section, or both, as required. This paper provides guidance for improving the design of antislide piles.

中文翻译：

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边坡加固对抗滑桩的影响：基于土拱效应的数值模拟

本研究基于有限差分数值模型，探讨了桩土相互作用机理及抗滑桩加固边坡的最佳方法。分析了边坡和抗滑桩的受力与位移原理。研究了各种因素的影响，例如桩后填充参数，桩嵌入方法和桩横截面形状。数值模型用于确定推力和牵引滑坡的抗滑桩的最佳布局。研究结果表明，填充物的内聚力对桩和坡度的影响大于摩擦角，是主要的控制因素。完全埋入的抗滑桩比半埋入的抗滑桩具有更好的抗滑效果。堆满地埋 当桩的自由部分的长度与滑动体的高度之比约为4/5时，可获得最佳的控制效果。此外，阶梯状截面桩比矩形桩具有更好的边坡加固效果，T形或梯形横截面。在实际应用中，可以将端承拱用作主要控制结构，而将摩擦拱用作次要控制，以尽可能提高土拱效应，从而提高桩和边坡的稳定性。为了控制各种推力形式的滑坡，应根据需要在活动部分，岩心滑动部分或两者中设置抗滑桩。本文为改进抗滑桩的设计提供了指导。