爆扩桩抗拔承载力计算公式研究

目前关于扩底桩尤其是爆扩桩抗拔力计算公式很少。在有限的扩底桩计算公式中,普遍存在着对爆扩桩的承载机理不清楚,对扩大头作用的体现机理表达不准确等问题。首先介绍一些典型的抗拔计算公式,选出有代表性的且适用于爆扩桩的抗拔计算公式, 然后根据工程试桩的计算结果,结合理论分析对公式的合理性进行探讨,最后根据爆扩桩的抗拔机理和试验分析给出易于运用的软土中大直径爆扩桩的抗拔承载力计算公式,并给出相应的构造要求。

Study on the Formula of the Explosive-enlarged Hole Pile's Carrying Capacity

Recently there are few formula about the pile that enlarges the pile's base especially the explosive - enlarged hole pile's carrying capacity. In the limited formula of explosive-enlarged hole pile, there are some unclear expressions of the mechanism in bearing load. This paper introduces some typical formula of bearing the pulling load at first, selects the formula which are representative and of explosive-enlarged carrying capacity, afterward , according to the output of test, discusses the rationality of formula combined with theoretic analysis, finally, according to the bearing mechanism of explosive-enlarged hole pile and trial analyses, induce a correctional formula for the carrying capacity of explosive-enlarged hole pile in soft soil, and gives the relevant requirements for conformation.