An analytical model is proposed to analyze the effects of sliding and debonding of the interface between the pile and the surrounding soil on the soil reaction under a lateral load. Based on the approximate three-dimensional analytical model, the vanishing stress assumption is also employed to satisfy the stress-free soil surface condition. Referring to the distribution of stresses on the pile-soil interface, the interface in the proposed model is divided into three parts—the bonding, sliding, and debonding areas. The behaviors of sliding and debonding are considered by incorporating the hypothesis of mixed boundary conditions on the pile-soil interface. Those behaviors were not considered in earlier analytical studies, which led to an overestimation of the soil reaction. Influence functions are adopted to define the relationship between the stresses and the displacements on the pile-soil interface. Then, the radiant stress method and the convolution of Fourier series are employed to solve the mixed boundary conditions occurring at the pile-soil interface. The validity of the proposed model is demonstrated by comparison with experimental data. Parametric studies are also presented to show the effects of predefined parameters on the behaviors of sliding and debonding.

提出了一个解析模型来分析侧向荷载作用下桩与周围土体之间界面的滑动和脱粘对土体反作用的影响。在近似三维分析模型的基础上，还采用了消失应力假设来满足无应力土壤表面条件。关于桩土界面上的应力分布，所提出的模型中的界面分为三个部分：粘结，滑动和脱粘区域。通过考虑桩土界面上混合边界条件的假设，可以考虑滑动和脱粘的行为。早期的分析研究未考虑这些行为，从而导致对土壤反应的高估。采用影响函数定义桩土界面上的应力与位移之间的关系。然后，采用辐射应力法和傅里叶级数的卷积来求解桩-土界面处的混合边界条件。通过与实验数据的比较证明了所提模型的有效性。还进行了参数研究，以显示预定义参数对滑动和脱胶行为的影响。