联合h型桩在滑坡体阻滑中应用数值模拟研究

抗滑桩在边坡加固工程中应用广泛且效果显著,但在大型滑坡体治理时,往往需要多桩联合作用来加强阻滑效果,此时抗滑作用如何分析缺少理论依据。利用结构单元建立了节点耦合的h型桩与桩间横梁、桩后锚索共同作用模型,并自开发程序识别潜在滑动面形成了基于数值模型的h型桩自动施加方法,并可自动计算桩截面参数,然后利用有限差分法进行变形稳定分析。在此基础上对比分析了降雨工况下h型抗滑桩联合支护与单桩支护对边坡稳定性的影响。研究结果表明:h型抗滑桩联合支护在大型滑坡支护工程中效果明显,桩体能够承受更大抗滑阻力及变形;支护效果受桩体支护高程影响,抗滑桩主体布置在边坡中部时效果最佳,支护位置随着坡底到坡顶,强度折减得到的安全系数呈现先增大后减小的趋势;研究成果可为滑坡体支护工程的实际应用提供参考。

Numerical Simulation Research on Application of Combined H-Pile in Sliding Resistance of Landslide

Anti-slide piles are widely used in slope reinforcement projects and the effect is remarkable. However, in the management of large-scale landslides, multiple-pile joint action is often needed to strengthen the anti-slide effect, and the analysis of anti-slide effect lacks theoretical basis. In this paper, a joint coupling model of h-shaped pile, beam between piles and anchor cable behind piles is established by using structural elements. A numerical model-based automatic application method of h-shaped pile is developed by identifying the potential sliding surface using self-development program, through which the pile section parameters can be automatically calculated, and then the finite difference method is used to analyze the deformation stability. On this basis, the influence of h-type anti-slide pile combined support and single pile support on slope stability under rainfall condition is compared and analyzed. The results show that the combined support of h-type anti-slide pile is effective in large landslide support engineering, and the pile body can withstand greater anti-slide resistance and deformation. The position of pile affects the supporting effect, which is best when the anti-slide pile is arranged in the middle position of the landslide. With the support position from the bottom to the top of the slope, the safety factor of the slope increases first and then decreases. The research results can provide reference for the practical application of landslide support engineering.