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Undrained seismic bearing capacity of strip footing adjacent to a heterogeneous excavation

Frontiers of Structural and Civil Engineering 2023年第4期17卷 566-583页

作者： Ramin VALI Saeed KHOSRAVI majid beygi Department of Civil Engineering Technical and Vocational UniversityTehran ***Iran Department of Mining Engineering Shahid Bahonar University of KermanKerman ***Iran Department of Civil Engineering Yazd UniversityYazd ***Iran

The analysis of the bearing capacity of strip footings sited near an excavation is critical in *** this study,the effects of the geometrical features of the excavation and the soil strength properties on the seismic bearing capacity of a strip footing resting on an excavation were evaluated using the lower and upper bounds of the finite element limit analysis *** effects of the setback distance ratio(L/B),excavation height ratio(H/B),soil strength heterogeneity(kB/cu),and horizontal earthquake coefficient(kh)were *** charts and tables were produced to clarify the relationship between the undrained seismic bearing capacity and the selected parameters.

关键词： excavation finite element limit analysis heterogeneous soil strip footing undrained bearing capacity

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Developing a novel big dataset and a deep neural network to predict the bearing capacity of a ring footing

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第11期16卷 4798-4813页

作者： Ramin Vali Esmaeil Alinezhad Mohammad Fallahi majid beygi Mohammad Saberian Jie Li Department of Civil Engineering Technical and Vocational University(TVU)TehranIran Department of Industrial Engineering Shiraz University of TechnologyShirazIran Faculty of Industrial and Systems Engineering Tarbiat Modares UniversityTehranIran School of Engineering RMIT UniversityMelbourneAustralia

The accurate prediction of the bearing capacity of ring footings,which is crucial for civil engineering projects,has historically posed significant *** research in this area has been constrained by considering only a limited number of parameters or utilizing relatively small *** overcome these limitations,a comprehensive finite element limit analysis(FELA)was conducted to predict the bearing capacity of ring *** study considered a range of effective parameters,including clay undrained shear strength,heterogeneity factor of clay,soil friction angle of the sand layer,radius ratio of the ring footing,sand layer thickness,and the interface between the ring footing and the *** extensive dataset comprising 80,000 samples was assembled,exceeding the limitations of previous *** availability of this dataset enabled more robust and statistically significant analyses and predictions of ring footing bearing *** light of the time-intensive nature of gathering a substantial dataset,a customized deep neural network(DNN)was developed specifically to predict the bearing capacity of the dataset *** computational and comparative results indicate that the proposed DNN(***-4)can accurately predict the bearing capacity of a soil with an R2 value greater than 0.99 and a mean squared error(MSE)below 0.009 in a fraction of 1 s,reflecting the effectiveness and efficiency of the proposed method.

关键词： Bearing capacity Ring footing Finite element limit analysis(FELA) BC-RF dataset Deep neural network(DNN)

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Synthesis of a NiTi_(2)–AlNi–Al_(2)O_(3) nanocomposite by mechanical alloying and heat treatment of Al–TiO_(2)–NiO

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International Journal of Minerals,Metallurgy and Materials 2019年第3期26卷 345-349页

作者： Reza beygi majid Zarezadeh Mehrizi Hossein Mostaan Mahdi Rafiei Ahmadreza Abbasian Department of Materials Engineering and Metallurgy Faculty of Engineering Arak University Advanced Materials Research Center Department of Materials Engineering Najafabad Branch Islamic Azad University Department of Materials Engineering Faculty of Engineering University of Sistan and Baluchestan

The aim of the present study was to investigate the phases formed during ball milling of Al–TiO_2–NiO. For this purpose, a mixture of Al–TiO_2–NiO with a molar ratio of 6:1:1 was used. Characterization of the milled powders by X-ray diffraction, differential thermal analysis, field-emission scanning electron microscopy, and transmission electron microscopy showed the formation of nanocrystalline NiTi_2 along with AlNi. A thermodynamical investigation confirmed that NiO was reduced by Al during ball milling, which consequently promoted TiO_2 reduction and the formation of NiTi_2. Al is capable of reducing NiO either during ball milling or at temperatures above the melting point of Al; by contrast, TiO_2 can be reduced by Al only by milling.

关键词： mechanical alloying NiTi_(2)-AlNi nanocomposite reaction mechanism

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