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根据桩的荷载传递研究知道,桩侧摩阻力及桩尖抵抗力的发挥过程是不同的,因此在确定单桩承载力时取用单一的安全系数K就缺乏确切的安全度概念,应该采用两个安全系数,即桩侧摩阻力安全系数K_f及桩尖抵抗力安全系数K_b。本文分析了5根模型桩及17根打入桩和钻孔桩的原位试验荷载传递资料,得到这三种桩的实际安全系数K_f,K_b与桩尖抵抗力发挥程度系数α之间的关系曲线,它能较好地反映桩的荷载传递规律。从试验资料还得到K_f,K_b与桩相对沉降量S/d之间的关系,由此得到相应于安全系数K=2时,三种桩的K_f和K_b取值范围,以及相应的S/d值,可供实际使用中参考。
According to the pile load transfer study, it is known that the friction resistance of the pile side and the resistance of the pile tip are different. Therefore, when determining the bearing capacity of a single pile, a single safety factor K is used to lack the exact safety concept. Two concepts should be adopted. The safety factor is the pile side friction coefficient of safety K_f and pile tip resistance factor K_b. This paper analyzes the in-situ test load transfer data of five model piles and 17 driven and drilled piles. The relationship between the actual safety factor K_f, K_b and the resistance coefficient α of the pile tip is obtained. Curve, it can better reflect the pile load transfer law. From the test data, the relationship between K_f, K_b and the relative settlement of the pile S/d is also obtained, which results in the K_f and K_b range of values for the three piles corresponding to the safety factor K=2, and the corresponding S/d. Value, available for practical use.