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首页> 外文期刊>Journal of Performance of Constructed Facilities >Field Study of Downdrag and Dragload of Bored Piles in Consolidating Ground
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Field Study of Downdrag and Dragload of Bored Piles in Consolidating Ground

机译：固结地基中钻孔桩下拖阻力的现场研究。

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This paper reports a field study on the downdrag and dragload of two pairs of bored piles installed in consolidating ground in the Zhejiang coastal area, China. During and after the construction of a 2.5-m-high embankment, the dragload and downdrag induced on the four piles, surface and subsurface soil settlement, pore water pressure, and lateral earth pressure were monitored. The field measurements show that the maximum dragloads in piles founded on relatively stiffer (end-bearing pile) and relatively softer layers (floating pile) ranged from 1,198 to 1,238 kN and from 798 to 870 kN, respectively. This suggests that the dragload in a floating pile can be one-third less than that in an end-bearing pile with similar geometries and embedded in the same consolidating ground. Deduced beta values above the neutral plane (NP) in the clay strata ranged from 0.28 to 0.3, respectively. A much smaller beta (0.04-0.06) was found below the NP. The existing analytical solutions overestimated the depth of the NP, leaving the structural design of the piles on the safe side. (C) 2015 American Society of Civil Engineers.
机译：本文报告了对浙江沿海地区固结地面中安装的两对钻孔桩的下拉力和拖曳力的现场研究。在建造2.5 m高的路堤期间和之后，监测了四个桩上的拖曳载荷和下拖曳力，地表和地下土壤沉降，孔隙水压力和侧向土压力。现场测量表明，在相对较硬的（端承桩）和相对较软的层（浮动桩）上桩基的最大阻力分别为1,198至1,238 kN和798至870 kN。这表明，浮动桩中的阻力可以比具有类似几何形状并嵌入相同固结地面的端承桩的阻力小三分之一。在粘土层中，中性面（NP）之上的推导β值分别为0.28至0.3。在NP以下发现了一个较小的beta（0.04-0.06）。现有的分析解决方案高估了NP的深度，从而使桩的结构设计更加安全。 （C）2015年美国土木工程师学会。

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