【摘要】 在滑坡治理工程中，离散的抗滑桩需依托桩间水平土拱形成连续抗滑面。为揭示桩间水平土拱作用下滑坡推力的分配机制并给出合理计算方法，利用有限元软件分析桩间水平土拱对滑坡推力的传递与分配特性，表明桩间水平土拱作用下仍有部分滑坡推力传递至拱前土体处，且当达到一定深度后，向两侧抗滑桩的荷载传递系数趋于稳定。根据Mohr-Coulomb强度准则确定土拱拱脚处破裂面位置，以向两侧抗滑桩荷载分配最优为原则确定土拱高跨比，进而基于极限平衡法给出了桩间水平土拱作用下滑坡推力向两侧抗滑桩的荷载传递系数简化计算方法，与数值模拟、模型试验结果对比验证其正确性。选取土体黏聚力、内摩擦角及桩间距进行参数分析。结果表明，当桩间距小于3倍桩径且滑体黏聚力与内摩擦角较大时，基本可以认为桩后滑坡推力全部作用于抗滑桩。研究成果可为抗滑桩滑坡推力的确定提供理论依据，有助于提高桩身内力、变形分析的准确性及工程设计的可靠性。更多还原

【Abstract】 In landslide stabilization engineering, discretely arranged anti-slide piles establish a continuous resisting surface by mobilizing horizontal soil arching effects between adjacent piles. To elucidate the distribution mechanism of landslide thrust under the inter-pile horizontal soil arching effect and establish a rational calculation method, a finite element analysis was first conducted to investigate the transmission and distribution characteristics of landslide thrust. The results demonstrate that a portion of the landslide thrust continues to propagate into the soil ahead of the arch under the soil arching action. Beyond a critical depth, the load transfer coefficient toward adjacent anti-slide piles stabilizes, indicating a convergence in load redistribution patterns. Subsequently, based on the Mohr-Coulomb strength criterion, the position of the failure surface at the arch foot is determined. Following the principle of prioritizing load distribution to the adjacent anti-slide piles, the height-to-span ratio of the soil arch is established. A calculation method for load transfer coefficient of landslide thrust to the piles under inter-pile horizontal soil arching is then established using the limit equilibrium method. The validity of this method is verified through comparative analysis with results of numerical simulation and model test. Finally, a parametric analysis was performed by selecting the cohesion and internal friction angle of the soil and the pile spacing. The results indicate that when the pile spacing is less than 3 times the pile diameter and the soil cohesion and internal friction angle are sufficiently high, the landslide thrust behind the piles can be considered entirely transferred to the anti-slide piles. The findings provide a theoretical basis for determining the landslide thrust on anti-slide piles, thereby improving the accuracy of pile internal force and deformation analysis as well as the reliability of engineering design.更多还原