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分析了筋材对加筋地基承载力的贡献 ,它包括筋材拉力向上分力的张力膜作用和水平分力的侧向限制作用。运用极限平衡原理推导出加筋地基极限承载力的计算公式 ,计算结果与已发表的典型模型试验结果相比 ,基本一致。从筋材抗拔出极限状态分析推导出筋材长度的计算公式。公式中筋材的拉力取极限抗拉强度 ,将极限承载力除以安全系数得容许承载力 ,而筋材长度的公式中已包含了抗拔出安全系数
The contribution of tendons to the bearing capacity of reinforced foundations is analyzed. It includes the action of tension membrane and the lateral restraint of horizontal component of upward force of tendons. The formula of ultimate bearing capacity of reinforced foundation is deduced by using the principle of limit equilibrium. The calculation results are basically the same as those of the published typical model tests. The calculation formula of the length of the bar is deduced from the analysis of the ultimate pullout of the bar. In the formula, the tensile force of the tendon takes the ultimate tensile strength, and the ultimate bearing capacity divided by the safety factor allows the bearing capacity, and the formula of the reinforcement length includes the pull-out safety factor