Effects of Random Field Heterogeneity of Spatial Soil Properties on the Bearing Capacity of Neighbouring Footing

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Yada Tesfaye Boru, Joanna Pieczyńska-Kozłowska, Wojciech Puła
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引用次数: 0

Abstract

The study presents a comprehensive study on the assessment of the bearing capacity of closely spaced strip footings on c-ø soil, considering spatial variability in soil properties. A linear elastic model is employed for footings and elastic–perfect plastic soil behaviour via the Mohr–Coulomb yield criterion. Soil properties obtained from extensive field investigations of Taranto Blue Clay (TBC) in Italy are modelled as stationary random fields (RFs) generated using the Fourier series method. The cohesion and friction angle RFs are integrated with the Z-soil FE code. The final results are obtained according to the random finite element method (RFEM). The study investigates the influence of spacing distances between footings and spatial correlation lengths of soil parameters on the bearing capacity. Results show how spacing distance affects bearing capacity. Moreover, it indicates that neighbouring footing bearing capacity is strongly correlated with investigated parameters. In the case of small spatial correlation lengths, the patterns were obtained as non-symmetrical, transitioning to more symmetrical patterns at larger lengths. The manuscript concludes by presenting reliability-based design considerations for the ultimate bearing capacity, considering the horizontal spatial scale of fluctuation (SOF). The findings emphasize the importance of evaluating allowable design bearing capacity for proximity structures using RFEM and provide valuable insights into the interplay between spacing distances and spatial variability in soil properties. To this end, the study underscores the critical interplay between spacing distance, spatial correlation lengths, and random soil properties in assessing neighbouring footing-bearing capacities.

空间土质随机场非均质性对邻近地基承载力的影响
考虑土壤性质的空间变异性,对c‐ø土壤上紧密间隔条形基础的承载力评价进行了综合研究。根据莫尔-库仑屈服准则,采用线性弹性模型来描述基础和弹塑性土的特性。通过对意大利塔兰托蓝粘土(TBC)进行广泛的实地调查,获得了土壤特性,并将其建模为使用傅立叶级数方法生成的平稳随机场(RFs)。黏聚力和摩擦角的有限元分析与Z‐soil有限元程序相结合。根据随机有限元法(RFEM)得到了最终结果。研究了地基间距和土体参数空间相关长度对地基承载力的影响。结果表明了间距对承载力的影响。此外,邻近基础承载力与所研究的参数有很强的相关性。在空间相关长度较小的情况下,获得的模式是非对称的,在较大的长度下过渡到更对称的模式。本文最后提出了基于可靠性的极限承载力设计考虑,考虑水平空间波动尺度(SOF)。研究结果强调了使用RFEM评估邻近结构的允许设计承载力的重要性,并为间距距离和土壤性质的空间变异性之间的相互作用提供了有价值的见解。为此,该研究强调了间距距离、空间相关长度和随机土壤特性在评估邻近基础承载能力方面的关键相互作用。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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