Seven soil-pile interactions and four change processes of soil-pile interaction are proposed to predict the deflection of large-diameter monopile near undrained clay slope under a lateral load in this paper. The equations of force and moment are established in each soil-pile interaction, and the predictive load-deflection curves are obtained by solving those equations. The effect of slope and near-slope distance on the $p$–$y$ curves is considered. The relationship between ultimate soil resistance and depth is divided into two forms according to the near-slope distance, and the ultimate soil resistance varies nonlinearly with the depth. The modulus of horizontal subgrade reaction in front of pile and behind the pile vary bi-linear and constant with the depth, respectively. To evaluate the accuracy of the new method, it is compared with the results of field tests and the finite element analysis. Finally, the method is used to analyze the effect of slope angle, near-slope distance, pile-soil adhesion and base resistance on lateral deflection.

提出了七个土-桩相互作用和四个土-桩相互作用变化过程，以预测大直径单桩在侧向荷载作用下不排水黏土边坡的挠度。在每次土-桩相互作用中建立了力和力矩方程，并通过求解这些方程获得了预测的载荷-挠度曲线。坡度和近坡距对坡向的影响$p$–$ÿ$考虑曲线。极限土抗性与深度之间的关系根据近坡距离分为两种形式，极限土抗性随深度呈非线性变化。桩前和桩后的水平路基反应模量分别随深度呈双线性和常数变化。为了评估新方法的准确性，将其与现场测试和有限元分析的结果进行了比较。最后，该方法用于分析边坡角度，近坡距离，桩土附着力和基础阻力对侧向挠度的影响。