富宁港软岩桩基承载特性模型试验成果及数值分析

水库周期性蓄水调度,导致库岸软岩地基的工程力学特性发生较大变化,直接影响桩基承载性能的长期有效性.通过对4种不同工况地基模型下的桩基竖向承载特性进行试验研究,得出了软岩嵌岩桩的桩身轴力、桩侧摩阻力、桩端阻力特性.结合物理模型实测成果,采用数值模拟分析了3种工况下桩基竖向承载力、桩身轴力和桩侧摩阻力的变化趋势,为内河库区港口工程软岩桩基设计和承载能力评价提供理论依据.

Test and numerical modeling of piles socketed in weak rock of Funing port

The periodical reservoir operation leads to a great change of physical properties of soft rock, thusaffects the long-term load-bearing capacity of a rock-socketed pile. This paper investigates the axial load bearingcapacity of rock-socketed pile with physical models under four working conditions, and gets the characteristicsof axial force, pile side friction and end resistance of piles socketed in weak rock. On the basis of test data, thispaper also conducts a 3D elasto-plastic finite element analysis for the axial bearing capacity, shaft friction, andend resistance of the piles with different lengths and diameters under three working conditions, which can provide athereoretical basis and a practical method for designing piles socketed in weak rock in inland river reservoirs.