Settlement of axially loaded pile groups in inhomogeneous soil
Settlement of axially loaded pile groups in inhomogeneous soil
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DOI：
10.1080/19375247.2019.1588535
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
J. Crispin;Colm P. Leahy
中科院分区：
文献类型：
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作者：
J. Crispin;Colm P. Leahy
准确的沉降预测是群桩性能设计的关键。基于物理动机建模假设的简单方法，结合明智选择的土壤材料常数，可以准确预测沉降，而无需在三维空间进行复杂的数值分析。Poulos引入的相互作用因子通过叠加两根桩的作用，简化了群桩的分析。均质土中桩间相互作用因素的封闭解既有单桩周围的位移场，也有第二桩的加筋作用。本文将研究嵌入非均匀土中的桩群，其剪切模量随深度的幂律函数变化。该问题是通过考虑“接收”桩在其顶部无荷载时，在受荷载的“源”桩的位移场作用下的响应来表述的。利用模型误差修正系数，推导出适合于日常设计的简化近似表达式。研究了该模型在预测实验结果方面的性能。给出了无量纲设计图表和实例。
Accurate prediction of settlement is key to performance-based design of pile groups. Simple methods based on physically motivated modelling assumptions, in conjunction with wisely chosen soil material constants, can accurately predict settlements without having to perform complex numerical analysis in three dimensions. Interaction factors, introduced by Poulos, simplify the analysis of pile groups through superposition of the effects of only two piles at a time. Closed-form solutions for interaction factors between piles in homogeneous soils are available in the literature, incorporating both the displacement field around a single pile and the reinforcing effect of a second pile. This paper will investigate pile groups embedded in inhomogeneous soils with shear modulus varying with a power law function of depth. The problem is formulated by considering the response of a ‘receiver’ pile carrying no load at its head, subjected to the displacement field of a loaded ‘source’ pile. A simplified approximate expression is developed using a model error correction factor that is suitable for routine design use. The performance of the proposed model at predicting experimental results is investigated. Dimensionless design charts and an illustrative example are provided.