关键词: 边坡工程, 锚索抗滑桩, 堆积型滑坡, 模型试验, 数值模拟

Abstract: In order to study the mechanical characteristics and the combined anti-slide mechanism of anchored slide-resistant pile for stabilizing the colluvial landslide, an indoor physical model test of a landslide reinforced by anchored slide-resistant pile under multi-stage loading was carried out. The variation curves of displacement of the pile top, soil pressure at the fore and rear of the pile, bending moment of the pile, axial force of anchor cable, deep horizontal displacement of sliding mass, and the characteristics of deformation and failure of the landslide are analyzed. Moreover, numerical simulation is adopted to compare with the model test and the results conform to each other. The results show that: 1) The horizontal displacement of the pile top, the bending moment of the pile and the axial force of anchor cable all show obvious three-stage characteristics under the variation of thrust load, and the load sharing ratio of the pile over the cable increases at first, then decreases, and finally tends to be stable. 2) The sliding mass resistance force at the fore of the pile is parabolic, and the value of the resistance force is small. The sliding mass thrust load at the rear of the pile is parabolic, and the resultant force point is 0.5h1 above the sliding surface (h1 is the length of the loaded segment). 3) The maximum bending moment point of the piles is always 2 cm below the sliding surface, indicating that the sliding bed at the fore of the pile has not been damaged. 4) The load distribution of the piles calculated through the measured bending moment of the piles indicates that the resistance force of the piles is mainly provided by the sliding bed below the sliding surface at the fore of the pile, and the resistance force is triangular. 5) The setting of the anchor cable can effectively limit the pile deformation. Meanwhile, the anchor cable failure problem should be paid more attention to in engineering practice. The research results can provide experimental basis for the rational design of anchored slide-resistant pile in the treatment of colluvial landslide.

Key words: slope engineering, anchored slide-resistant pile, colluvial landslide, model test, numerical simulation