The single pile is simplified to elastic shaft elements suffering skin friction and the soil mass is considered to be homogeneous isotropic elastic semi space.
将单桩简化为受侧摩阻力的弹性杆单元，土体简化为均质弹性半空间无限体。
The relationship of skin friction and relative displacement between the pile shaft and the surrounding soil is idealized as perfectly elastoplastic.
通过假定桩土界面摩阻力与相对位移为理想弹塑性关系；
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