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b.静力法桩的极限承载力通常是根据实验室或现场试验测定的土的抗剪强度来计算,假定极限承载力Qu等于桩侧阻力Qs和桩端阻力Qp之和: Qu=Qs+Q_p=fsAs+q_pA_p 式中fs和q_p分别为单位桩侧阻力和单位桩端阻力,As和A_p分别为桩身和桩端的面积。桩端阻力q_p可由无粘性土和岩石的内摩擦角来计算,或由粘性土的粘聚力来计算,如Lindqvist和Petaja所论述的。Kerisel(1961)指出:一般情况下,砂土中的桩端阻力随深度线性增加,直到其深度达
b. The ultimate bearing capacity of static piles is usually calculated based on the shear strength of the soil measured in the laboratory or field test. Assume that the ultimate bearing capacity Qu is equal to the sum of the pile side resistance Qs and the pile end resistance Qp: Qu=Qs+ Q_p=fsAs+q_pA_p where fs and q_p are unit pile resistances and unit pile end resistances, respectively, and As and A_p are the area of pile body and pile end, respectively. The pile tip resistance q_p can be calculated from the cohesionless soil and the internal friction angle of the rock, or from the cohesive force of the clay soil, as discussed by Lindqvist and Petaja. Kerisel (1961) pointed out that under normal conditions, the tip resistance in sand increases linearly with depth until its depth reaches