In this paper , based on the characteristics of force and deformation of pars , the time - variation of the elastic coefficient of fulcrum in the calculation model of pars is analyzed and studied ; and the lessening of rigidity coefficient of elastic fulcrum , which is caused by the continual bottom soil resilience beside the piles and the increase of excavation depths during different steps , is discussed 摘要根据桩锚支护结构的受力和变形特点，研究分析了桩锚支护结构计算模型中支点弹性刚度系数的动态时变性；讨论了随桩内侧坑底土的持续反弹以及不同工况下随著基坑开挖深度的逐渐增大，进而导致弹性支撑刚度系数的减小的变化规律。
