开口钢管桩竖向承载力机理及计算探讨

Study of Vertical Bearing Mechanism and Calculations of Open-Ended Steel Pipe Piles

由于具有施工、回收方便的优点,许多临时结构采用打入式开口钢管桩基础,然而现行桥规并没有关于开口钢管桩竖向承载力计算的规定。结合杭州湾跨海大桥南岸栈桥工程实例,介绍开口钢管桩的竖向承载机理,推导了考虑闭塞效应的桩端阻力理论公式,经过与静载试验结果的比较,证明该公式是可靠的。

The driven open-ended steel pipe piles have been widely used for foundations of temporary works owing to the advantages that the piles are easy to be constructed and recovered for use. However, the present codes of bridges don＇t contain any specifications for calculations of the vertical bearing capacity of the piles. In this paper, with reference to exemplars of construction of the trestle bridge on the south bank of Hangzhou Bay Bridge, the vertical bearing mechanism of the open-ended steel pipe piles is introduced, and the theoretic formula of end resistance of the piles is derived, taking into account of stoppage effect. The formula herewith proves to be reliable through comparison of the calculations to the static test results of the piles.