考虑桩土相互作用的“品”字型抗滑桩计算方法

中文摘要: 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。
Abstract:Based on the research of anti-slide pile in landslide control engineering,a new combined anti-slide pile was put forward,which is composed of three single piles,connecting by pile top beam,and has a higher stiffness and less deformation.In the landslide thrust,back row piles produce deformation,and the deformation directly effect on the soil between piles.Through the solution of additional stress of soil between piles,the additional effect of landslide thrust in the front row pile was calculated.By using the displacement earth pressure model,the pile flexural differential equation was established.This kind of anti-slide structure was applied to control Suoertou landslide in Zhouqu region,and the field measurements and theoretical calculation methods for the bending moments and displacement values were compared.The results showed that the proposed method is reasonable and feasible,and provides a basis for further study of the anti-slide piles’stress mechanism of the pile-soil interaction.