刚性桩复合地基桩土应力比计算

分别取桩、土单元进行受力分析,建立变形协调微分方程.基于荷载传递法,考虑群桩效应的影响,计算出桩与桩侧单位厚度土相互作用的等效刚度系数.根据桩、土和垫层的协同作用及边界条件,求得了刚性桩复合地基桩土应力比,并对影响桩土应力比的参数进行了分析.本文方法考虑了群桩效应、侧向土压力等因素对桩侧摩阻力的影响,对已有的模型试验进行计算,所得计算结果与实测结果较为吻合,验证了该方法的合理性,对工程实践具有一定的指导意义.

Settlement Method for the Calculation of Pile-soil Stress Ratio of Rigid Pile Composite Foundation

Taking the pile unit and the soil unit for force analysis, the basic differential equations were established.The equivalent stiffness coefficients of the pile and the unit thickness of soil around each pile were developed, taking into account the pile group effect and the interaction between the pile and the soil in the load transfer method.Based on the relation between pile-soil-cushion and boundary conditions, the pile-soil stress ratio and the influence of important parameters were obtained.In the meantime, the pile group effect and the soil lateral pressure were taken into account in the proposed method.The pile-soil stress ratio calculated agrees well with those measured from the model test of pile foundation, showing the rationality of the approach and guiding significance in engineering practice.