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首先,分析了陡坡效应的形成机理以及陡坡段横向受荷桩的受力特性。其次,基于Winkler弹性地基梁理论,通过对桩周横向荷载及岩土体抗力的合理简化,建立了考虑陡坡效应的横向受荷桩简化受力模型。然后,将桩身划分为若干段,将桩周荷载及岩土体抗力等效为节点荷载,分别积分计算出各节点的弹簧刚度系数,进而利用纽玛克数值计算方法进行递推运算得到桩身内力与位移。最后,以某实际工程为例进行对比分析发现:桩身最大弯矩及水平位移最大误差均不足5%,验证了纽玛克数值计算方法及程序是合理可行的,且考虑陡坡效应后的计算结果偏大,对工程安全性有利。
Firstly, the formation mechanism of steep slope effect and the stress characteristics of the laterally loaded piles in steep slope section are analyzed. Secondly, based on the Winkler elastic foundation beam theory, a simplified simplified model of lateral loading piles considering the effect of steep slopes is established by reasonably simplifying the lateral load around the pile and the resistance of the soil and the rock mass. Then, the pile body is divided into several sections, and the load around the pile and the resistance of the soil and the soil are equivalent to the node loads, and the spring rate coefficients of each node are respectively integrated, and then the recursion calculation is performed by the Newark numerical calculation method to obtain the pile Body force and displacement. Finally, taking a practical engineering as an example, the comparative analysis shows that the maximum bending moment and the maximum horizontal displacement of the pile body are all less than 5%, which verifies that the numerical method and program of Newmark are reasonable and feasible and the calculation considering the steep slope effect The result is large, good for the safety of the project.