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分析了加筋碎石桩复合地基的承载机理,探讨了加筋碎石桩复合地基的几种破坏模式。在不同的破坏模式下根据极限平衡理论导出了加筋碎石桩单桩极限承载力计算公式,破坏模式1主要由格栅套筒抗拉强度控制,破坏模式2由加筋段桩体侧摩阻力和非加筋段桩体鼓胀破坏前向上提供的端承力共同控制。实例计算表明,加筋碎石桩的承载力比普通碎石桩的承载力有显著提高,且加筋碎石桩的加筋深度与格栅抗拉强度之间有最优组合,最合理地利用加筋格栅提高碎石桩承载力,最后将加筋碎石桩应用到了高速公路软基处治中。
The bearing mechanism of the reinforced gravel pile composite foundation is analyzed, and several failure modes of the reinforced gravel pile composite foundation are discussed. Under different failure modes, the ultimate bearing capacity formula of reinforced gravel pile is deduced according to the theory of limit equilibrium. The failure mode 1 is mainly controlled by the tensile strength of the grille sleeve. The failure mode 2 consists of the side friction Resistance and non-reinforced section of the bulge destroyed before the end of the joint force provided by the joint control. The calculation example shows that the bearing capacity of the reinforced gravel pile is obviously higher than that of the ordinary gravel pile, and the optimal combination of the reinforced depth of the reinforced gravel pile and the tensile strength of the grating is the most reasonable The use of reinforced grille to improve the bearing capacity of gravel pile, the final application of reinforced gravel pile soft foundation treatment.