考虑桩土相互作用的“品”字型抗滑桩计算方法

基于对抗滑桩在滑坡防治工程中的应用研究,提出一种新型组合式“品”字型抗滑桩,抗滑桩由3根单桩通过桩顶连梁连接组成空间结构,具有刚度大、变形小的特点;基于位移土压力模型,建立桩身挠曲线微分方程,后排桩在滑坡推力作用下发生变形并直接作用于桩间土上,引入Boussinesq解,通过对桩间土附加应力的求解进一步计算作用于前排桩的附加滑坡推力;将“品”字型抗滑桩应用于舟曲锁儿头滑坡,通过现场试验和现场监测与理论计算方法所得弯矩值和位移值的对比表明,所建立的计算方法合理可行,为进一步研究桩土相互作用的抗滑桩受力机理提供了一定的依据.

Calculation Method of The Three Piles of Facing Each Other in Consideration of The Pile-soil Interaction

By the application research of anti-slide pile in landslide control governance project, first proposed a novel modular the three piles of facing each other, this anti-slide pile is composed of three piles which connected by pile cap beam and formed the spatial structure, it has stiffness, deformation characteristics. Second, based on displacement earth pressure model, pile flexural differential equation is established, landslide thrust made the behind pile deformation, this deformation act on the soil which between piles, bring in Boussinesq, solving additional stress in order to calculate additional landslide thrust of the front pile. Finally, this anti-slide structure has been applied to landslide in Zhouqu Suoertou and has carried on the field test. By contrast the field test to the theory calculation, Calculation method established in this paper is reasonable and feasible, which provides a basis for further understanding the mechanism of anti-slide piles in consideration of the pile-soil interaction.