边坡治理中h型支挡结构的应用与分析方法研究

Analytical Method and Application of H-type Retaining Structure in Slope Engineering

边坡h型支挡结构桩土协同作用机理复杂,尚未形成一套科学合理的工程设计评价方法,基于刚性联系梁假定以及前、后桩与桩间土协同作用机理,建立了h型支挡结构受荷分析模型,根据Euler-Bernoulli梁理论结合桩周线性土弹簧提出了前、后桩全桩挠曲微分控制方程,保证了桩身变形在滑面处的变形协调关系,利用中心差分格式及矩阵运算方程组对h型结构全桩内力及变形进行了求解,最后基于克枯滑坡h型支挡结构工程设计案例,通过有限元模型与理论分析模型对比,发现二者计算的桩身最大弯矩与剪力误差在5%以内,验证了文中所提方法的可靠性,可满足h型支挡结构的工程设计需求。

The pile-soil interaction mechanism of h-type retaining structures is complicated.As a result,a reasonable engineering design method has not been developed yet.The deflection differential equations of the front and rear piles are established on the basis of the Euler-Bernoulli beam theory and a series of soil springs around piles.It ensures the deformation compatibility of pile at sliding surface,a matrix equation set using the finite difference method was conducted to evaluate the internal force and deformation of h-type retaining structure.A finite element model was established based an h-type retaining structure engineering in Keku landslide.The two methods are used for evaluating the internal force and deformation of piles,the difference in the maximum bending moment and shear force between the finite difference method and FEA method is less than 5%,which indicates that the proposed method is reasonable for evaluating the h-type retaining structure in slope design engineering.