弧形排列抗滑桩支挡结构计算理论研究

传统的悬臂式抗滑桩在承受较大的滑坡推力时,桩体变形往往过大,且桩身内力分布也不均匀。若将抗滑桩按弧形布置,各桩桩顶用连系梁连接,两侧布设截面较大的抗滑桩,则组成了一种空间拱形抗滑支挡结构,即弧形排列抗滑桩支挡结构。该新型抗滑支挡结构由抗滑桩、连系梁和拱脚抗滑桩共同承担滑坡推力,克服了由桩体单一承受滑坡推力的弱点。对连系梁和抗滑桩进行理论分析推导,可计算出连系梁和抗滑桩的内力及位移。计算结果表明:弧形排列抗滑桩支挡结构能够较好地约束桩体的变形,充分发挥了连系梁混凝土的抗压性能。

Theoretical Study on Calculation for Retaining Structure of Anti-sliding Piles Arranged in Arch Shape

The traditional cantilevered anti-sliding pile is always subject to excessively large deformation of pile body when suffering large landslide thrust, and uneven force distribution inside the body. If the piles are arranged in a curved line with the top connected by linking beam, and the anti-sliding piles with large section are arranged on both sides, a kind of spatial arch anti-slide retaining structure is constituted, that is the retaining structure of anti- sliding piles arranged in arch shape which bears the thrust force jointly with the anti-sliding piles, linking beams and the anti-sliding piles at the arch foot, thus overcomes the defect that the thrust is endured by the pile body only. Based on the through theoretical analysis and derivation of the beam and the pile, the internal force and displacement thereof are calculated. The results show that this retaining structure may constrain the pile deformation well and give full play of the compression resistance of the linking beam concrete.