Model tests on bearing behaviors and calculation of multi-stage expanded piles
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摘要: 在宁波砂质粉土中开展了等直径桩、扩底桩、扩径桩（多级扩径）抗压静载模型试验,测试获得了单桩承载力-沉降（Q-s）曲线、桩侧摩阻力,对比分析了3种桩的承载特性,并推导建立了多级扩径桩承载力和沉降计算公式,结果表明：多级扩径桩更能充分地发挥扩大头下端土体的承载作用,具有提高承载力、减小沉降的作用;受到扩大头的影响,多级扩径桩中部侧阻无法充分发挥,但扩径阻力是荷载传递的重要方式;建立的多级扩径桩的承载力及沉降计算公式较为合理。Abstract: The bearing capacity-settlement curve (Q - S) of single pile and the side friction resistance of piles are obtained based on the model tests on the compressive static loads on equal-diameter pile, expanded pile and expanded-diameter pile (multi-stage expansion) in the sandy silt of Ningbo, the bearing behavior of three kinds of piles are compared, and the formula for the bearing capacity and settlement of multi-stage expanded piles are deduced for the first time. The results show that expanded-diameter pile can make full use of the bearing capacity of the soil under the expanded head and has the better effect of reducing the settlement and increasing the bearing capacity. The lateral resistance near the middle of the enlarged head cannot be fully exploited because of the expanded head. However, the expansion resistance is an important way of load transfer. The proposed formula for calculating the bearing capacity and settlement of multi-stage expanded piles is reasonable.
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Keywords:
- multi-stage expanded pile /
- model test /
- static load test /
- bearing behavior /
- design calculation
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