This paper presents a p–y curve model for laterally loaded X-sectional cast-in-place concrete (XCC) piles, which are a type of non-circular cross-sectional pile, in soft clay. The recently developed empirical solutions for the elastic stiffness and the ultimate lateral resistance of the two-dimensional laterally loaded X-shaped cross-sectional pile segment–soil system by the authors using the complex variable elasticity theory and finite element limit analysis are used as the two key parameters in constructing the p–y curve. An elastic–perfectly plastic p–y curve is immediately obtained with the linear elastic state described by the elastic stiffness of the two-dimensional system, and the perfectly plastic state is controlled by the ultimate lateral resistance. Furthermore, to consider the nonlinear behaviour, a more robust model using the hyperbolic function is selected for producing the p–y curve with the elastic stiffness and the ultimate lateral resistance incorporated. Subsequently, the p–y model is introduced to the Winkler model to generate solutions for the response of laterally loaded XCC piles. The proposed model considers the non-circular cross-sectional effect of the XCC pile and can also be regarded as a simple method for constructing the p–y curve for other non-circular cross-sectional piles.

本文介绍了一种在软黏土中横向加载的X截面现浇混凝土（XCC）桩的p – y曲线模型，该桩是一种非圆形截面的桩。作者采用复变弹性理论和有限元极限分析方法，对作者最近开发的二维横向受力X形截面桩段-土体系的弹性刚度和极限侧向阻力的经验解进行了求解。构建p – y曲线的两个关键参数。弹性完美的塑料p – y用二维系统的弹性刚度描述的线性弹性状态可立即获得曲线，而极限横向阻力则控制了完全塑性状态。此外，为了考虑非线性行为，选择了一种使用双曲函数的更健壮的模型来生成具有弹性刚度和极限侧向阻力的p - y曲线。随后，将p - y模型引入Winkler模型，以生成横向荷载XCC桩响应的解决方案。提出的模型考虑了XCC桩的非圆形横截面效应，也可以视为构造p –的简单方法。其他非圆形截面桩的y曲线。