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Assessing foundation behaviour under complex loading near tunnels

Journal of Mountain Science 2024年第10期21卷 3503-3520页

作者： Piyush KUMAR Vinay Bhushan CHAUHAN Aayush KUMAR Civil Engineering Department Madan Mohan Malaviya University of TechnologyGorakhpur 273010India

The stability of strip footings subjected to eccentrically inclined loads is critical for reliable foundation *** study investigates the effect of a circular unlined tunnel in a rock mass on the ultimate bearing capacity(UBC)of a foundation with width B under inclined and eccentric *** finite element limit analysis was employed to evaluate the reduction in UBC of the footing resting above a *** examined critical parameters include normalized load eccentricity(e/B),load inclination(β),and horizontal and vertical distances of the tunnel from the foundation(P/B and Q/B,respectively),along with rock mass *** results reveal that for e/B≥0.25 and β≤60°,the reduction coefficient,R_(c)≥0.90,suggesting that the presence of a tunnel has a minimal impact on the load-bearing capacity of the footing,with failure primarily governed by load eccentricity and ***,potential failure mechanisms are explored,showing that at lower e/B,higher β,and lower Q/B,the tunnel significantly affects footing's failure ***,at higher e/B and lower β,failure is due to rotational effects of footing,regardless of the tunnel's *** predict the Rc more accurately,due to the time-consuming nature of direct calculations,both MLR and ANN models were *** MLR model provided a baseline for comparison,while the ANN model,with a coefficient of determination(R2)of 0.98,demonstrated superior accuracy compared to the R2=0.96 of *** both approaches ensured robust and efficient predictions of *** Rc does not directly provide the reduced UBC of footing due to presence of tunnel,the study introduced bearing capacity factor(Nc)to enable direct calculation of the reduced UBC of *** findings offer theoretical guidelines for preliminary design and provide practitioners with an effective tool for evaluating UBC reduction in complex loading scenarios involving tunnels.

关键词： Unlined tunnel Shallow foundation fela Rock Mass ANN MLR

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Developing soft-computing regression model for predicting bearing capacity of eccentrically loaded footings on anisotropic clay

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Artificial Intelligence in Geosciences 2023年第1期4卷 68-75页

作者： Kongtawan Sangjinda Rungkhun Banyong Saif Alzabeebee Suraparb Keawsawasvong Research Unit in Sciences and Innovative Technologies for Civil Engineering Infrastructures Department of Civil EngineeringFaculty of EngineeringThammasat School of EngineeringThammasat UniversityPathumthani12120Thailand Department of Roads and Transport Engineering University of Al-QadisiyahAl-DiwaniyahAl-QadisiyahIraq

In this investigation,the bearing capacity solution of a strip footing in anisotropic clay under inclined and eccentric load is analyzed using the numerical simulation *** lower and upper bound finite element limit analysis(fela)approaches are utilized to establish precise modeling and derive the numerical outcomes of a strip footing’s bearing *** analyses use effective automated adaptive meshes with three iteration stages to enhance the accuracy of the *** parametric analysis is performed to examine the influence of four dimensionless parameters which are taken into account in this study,namely the anisotropic strength ratio,the dimensionless eccentricity,the load inclination angle,and the adhesion factor to the bearing capacity ***,a new model has been proposed to predict the bearing capacity factor for the calculation of the undrained bearing capacity for footings resting on an anisotropic clay using an advanced data-driven method(MOGA-EPR).The new model takes into account the anisotropy,eccentricity,and inclination of the applied load and could be used with confidence in routine designs of shallow foundations in undrained conditions with the consideration of the anisotropic strengths of clays.

关键词： Bearing capacity Anisotropic clay Footing fela MOGA-EPR

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