沉管挤密抗拔防浮碎石桩的抗拔承载力计算分析

基于现场试验检测结果，分析了沉管干振挤密抗拔防浮碎石桩在砂土中的抗拔破坏模式和应力传递机理，运用极限平衡原理研究了抗拔承载力，得到了极限抗拔承载力计算公式，并利用公式对工程实测结果进行了分析比较，表明两者较为一致。现场试验表明，未达破坏荷载前，抗拔碎石桩的抗拔承载力与变形有较明显的线性关系；抗拔碎石桩破坏性状明显，能明确得到抗拔碎石桩的破坏荷载。

Study of pullout bearing capacity of diving dry-vibrated compacted and anti-pull stone column

Based on the in-situ test, anti-pull failure mode and stress transfer law of diving dry-vibrated compacted and anti-pull stone columns in sand are analyzed. The calculation of uplift capacity is studied employing the principle of limit equilibrium; and the computing formulas of the pullout bearing capacity are obtained. Based on the formulas and the experiment data, the calculating results are compared with the experiment data. The research shows that the calculating results are consistent with the experiment data. Uplift bearing capacity and settlement of anti-pull stone column have visible linear relations before reaching the failure load in the in-situ test. The failure characteristic of anti-pull stone column is very clear and the failure load of the anti-pull stone column can be obtained specifically.