An existing pile efficiency method for the design of lateral new pile behavior in sites with existing piles
An existing pile efficiency method for the design of lateral new pile behavior in sites with existing piles
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DOI：
10.1139/cgj-2022-0401
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发表时间：
2023-07-04
影响因子：
3.6
通讯作者：
Tamura，Shuji
中科院分区：
文献类型：
--
作者：
Li，Hongjiang;Tamura，Shuji
地基再利用是可持续工程建设的发展趋势。然而，现有桩作为刚性夹杂物的再利用及其在不同的新桩和现有桩间距下对新建桩（新桩）的贡献仍然没有得到充分的理解。本文通过离心试验，研究了不同桩间距下，既有桩对新桩水平承载力的影响。分析了反映既有桩对新桩水平承载力贡献的既有桩效率，结果表明，既有桩对新桩水平承载力的影响随着新桩与既有桩间距的增大呈指数衰减。当桩间距大于6D（D为新桩直径）时，新桩-土-既有桩的横向相互作用可以忽略不计。随后进行了参数研究，以量化现有的桩效率在不同的变量，包括新的桩头约束，加载位移，弯曲刚度，荷载偏心，嵌入深度，和土壤特性。最后，提出了一种基于既有桩效率的新桩水平承载力估算方法，为既有桩场地的新桩水平承载力设计提供了一种有效的方法。
Foundation reuse is the development trend of sustainable engineering construction. However, the reuse of existing piles as rigid inclusions and their contribution to newly constructed piles (new piles) under different new and existing pile spacings are still insufficiently understood. In this paper, a series of numerical investigations were conducted based on centrifuge tests to examine the effect of existing piles on the lateral behavior of new piles under different pile spacings. The existing pile efficiency that reflects the contribution of existing piles to the lateral capacity of new piles was analyzed, and it was shown that the impact of existing piles decays exponentially with the pile spacing between new and existing piles. Beyond the spacing of 6D(D: the diameter of new piles), the lateral new pile–soil–existing pile interaction can be neglected. A parametric study was subsequently performed to quantify the existing pile efficiency under different variables, including the new pile-head restraint, loading displacement, bending stiffness, load eccentricity, embedded depth, and soil properties. Finally, an existing pile efficiency-based method for the estimation of the lateral capacity of new piles was proposed, which provides an efficient way to design laterally loaded new piles in sites with existing piles.