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以福建省浦城高速公路某滑坡治理工程为例,利用ABAQUS有限元软件,分别建立圆形与矩形截面门架式抗滑桩的三维数值分析模型,考虑桩-土相互作用,采用滑带土强度折减有限元方法,对比分析两种截面桩的受力和变形特性。以圆截面桩为例探讨了桩身材料以及桩顶连系梁的刚度对桩身位移和内力的影响。分析表明:相同截面积和埋深情况下,圆形门架桩抗滑能力优于矩形门架桩,而且能有效减少配筋;对于门架式抗滑桩滑坡推力不仅可通过连系梁从后桩传递至前桩,而且会通过桩间土来传递,现行简化分析方法中无法合理考虑,因此应尽量采用三维数值模拟方法进行分析;抗滑桩桩体采用高强混凝土的意义不大;在保证前后桩可靠连接的条件下,连系梁不宜太厚,可取0.5~1.0倍桩的截面高度。
Taking a landslide control project of Pucheng Expressway in Fujian Province as an example, the three-dimensional numerical analysis model of circular and rectangular cross-section gantry anti-slide piles was established by using ABAQUS finite element software. Considering the pile-soil interaction, Reduction of finite element method, comparative analysis of two kinds of cross-section force and deformation characteristics. Taking circular cross-section piles as an example, the effects of pile material and the stiffness of the tie-beam on pile displacement and internal force are discussed. The analysis shows that under the condition of the same cross-sectional area and depth, the anti-skid capacity of the circular gantry crane is better than that of the rectangular gantry crane, and the reinforcement can be reduced effectively. The thrust of the gantry anti- After the pile is transferred to the former pile, and will pass through the soil between the piles, the current simplified analysis method can not be considered reasonably, so the three-dimensional numerical simulation method should be used for analysis as far as possible; anti-slide pile is not meaningful for high-strength concrete; Under the condition of ensuring the reliable connection between the front and the back piles, the connecting beam should not be too thick, and the sectional height of the pile of 0.5 to 1.0 times is desirable.