水下砂桩复合地基承载力分析的有限元强度折减法研究

摘要

The ultimate bearing capacity of the composite foundation with underwater sand compaction piles in Yangshan is analyzed with strength reduc-tion FEM and the results are compared with those of incremental loading method, Prandtl and loading experiment. The calculation results show that the results of strength reduction FEM are close to those of other methods, proving the feasibility of strength reduction FEM in the calculation of foundation bearing capacity.It can also be applied in practical engineering. The study results are valuable for the analysis on the bearing capacity of composite foun-dation with underwater compaction sand piles.%　　利用有限元强度折减法，对洋山深水港区水下挤密砂桩复合地基极限承载力进行分析，并同增量加载方法、经典的Prandtl法及荷载实验结果进行了比较。计算结果表明：有限元强度折减法同其它方法的计算结果较为接近，验证了利用有限元强度折减法计算地基承载力的可行性，该法能够运用于实际工程中。研究结果对水下挤密砂桩复合地基承载力的分析具有参考价值。