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大直径钢管桩在海洋工程建设中的使用越来越广泛。海上大直径钢管桩试桩周期长、难度大,相关测试数据及研究成果较为少见。本文基于美国石油行业协会API规范,分析了某海上风电大直径钢管桩静压载试验数据,研究了桩侧阻力与桩端阻力随压荷载变化关系。结果表明,对于本文分析的海上大直径钢管桩,其土塞状态一般为不完全闭塞,计算抗压极限承载力时应计入桩管内侧摩阻力;桩侧摩阻力随压荷载增大而逐渐发挥,相同荷载作用下,无黏性土地层侧摩阻力发挥程度较黏性土高;桩端土体破坏分为弹性变形与塑性变形两个阶段,两阶段端阻发挥程度分别可达约50%和80%,当桩端产生0.05d位移时,桩体达到极限平衡状态。
The use of large diameter steel pipe piles in marine engineering is more and more widely used. Large-diameter offshore pipe pile test pile long cycle, the difficulty of large, the relevant test data and research results are relatively rare. Based on the API specification of the American Petroleum Institute, this paper analyzes the static pressure test data of a large diameter steel pipe pile in offshore wind power and studies the relationship between the pile side resistance and the pile end resistance with pressure load. The results show that for the large diameter steel pipe pile analyzed in this paper, the plug state of the pile is not completely occluded, and the inner frictional resistance of the pile pipe should be taken into account when calculating the ultimate compressive ultimate strength. Gradually exerting the same load, the side friction resistance of the non-cohesive soil layer is higher than that of the cohesive soil; the failure of the soil at the pile tip is divided into two stages of elastic deformation and plastic deformation, and the end resistances of the two stages can reach about 50% and 80%, when the pile end produce 0.05d displacement, the pile reaches the limit equilibrium state.