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土钉抗拔承载力是土钉设计中的关键指标之一,但根据相关规范推荐的经验公式得出的计算值范围较大。假定土钉和周围土体的界面强度服从摩尔-库仑准则,并考虑其剪胀性,推导出了土钉侧摩阻力及轴力的解析表达式,从而得到了土钉抗拔承载力的计算公式。通过与试验值的对比,证明了本文公式的有效性。
Soil nailing pullout capacity is one of the key indicators in the design of soil nails, but the calculated values ranged from the empirical formulas recommended by relevant specifications. Assuming that the interfacial strength between soil nails and the surrounding soil obeys the Mohr-Coulomb criterion and considering its dilatancy, an analytical expression for the frictional and axial forces of soil nails is deduced, and the calculation of the anti-pull bearing capacity of soil nail is obtained formula. By comparing with the experimental value, the validity of the formula in this paper is proved.