从塑性力学的角度出发,应用球孔扩张理论,并假定土体为均质、各向同性的理想弹塑性体,引入了土性参数剪胀角以区别于非土体等其他材料,采用摩尔一库仑屈服函数和不相适应的流动法则求得球形扩张问题的解析解,分析成桩过程中桩周土体的应变与应力并应用此理论估算压扩支盘桩单桩承载力.%From the perspective of plasticity, this paper uses spherical cavity expansion theory, and assumes the soil with homogeneous and isotropic features as the perfect plastic body, introduces soil parameter dilation angle to distinguish them from other non-soil materials, uses Moore-Coulomb yield function and incompatible flow rule to obtain the analytical solution, and analyzes strain and stress of pile soil in the process pile and applies this theory to estimate the bearing capacity of branch pile.
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