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Development of mathematically motivated hybrid soft computing models for improved predictions of ultimate bearing capacity of shallow foundations

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第3期15卷 747-759页

作者： Abiodun Ismail Lawal Sangki Kwon Department of Energy Resources Engineering Inha UniversityIncheonSouth Korea Department of Mining Engineering Federal University of TechnologyAkureNigeria

Ultimate bearing capacity(UBC)is a key subject in geotechnical/foundation engineering as it determines the limit of loads imposed on the *** most reliable means of determining UBC is through experiment,but it is costly and time-consuming which has led to the development of various models based on the simplified *** outcomes of the models are usually validated with the experimental results,but a large gap usually exists between ***,a model that can give a close prediction of the experimental results is *** study proposes a grasshopper optimization algorithm(GOA)and salp swarm algorithm(SSA)to optimize artificial neural networks(ANNs)using the existing UBC experimental *** performances of the proposed models are evaluated using various statistical *** obtained results are compared with the existing *** proposed models outperformed the existing *** proposed hybrid GOA-ANN and SSA-ANN models are then transformed into mathematical forms that can be incorporated into geotechnical/foundation engineering design codes for accurate UBC measurements.

关键词： Ultimate bearing capacity(UBC) geotechnics Grasshopper optimization algorithm(GOA) Salp swarm algorithm(SSA) Soft computing(SC)method

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Longwall top coal caving design for thick coal seam in very poor strength surrounding strata

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International Journal of Coal Science & Technology 2021年第4期8卷 641-658页

作者： H.Jangara C.Atilla Ozturk Mining Engineering Department Faculty of MinesIstanbul Technical UniversityIstanbulTurkey

Alpu lignite field is an important coal deposit with nearly 2 billion tons of coal resources located in the middle of *** mine deposit consists of three main *** thickness of two of them vary from 4 to 30 *** surrounding rock mass is very poor in terms of *** high clay content and weak rock mass make mechanized mining *** this research,applicability of the longwall top coal caving method was *** very weak strength behavior of the coal and the surrounding strata increases the importance of research in the mine site in terms of ground *** aim is to design the mechanized longwall mine based on ground control *** of all,classification of the roof,coal,inter-burden,and floor strata were classified based on geotechnical ***,cavability index,shield,and floor bearing capacity were *** methods were applied to understand the limitations of a mechanized system that is very critical due to the very low strength *** to the main results,roof strata was classified as immediately caving while mining height was calculated as 5-6 ***,the relations among geotechnical characterizations of roof and floor strata,cutting and caving heights,and required shield capacity were presented based on analytical and numerical *** proposed approach can be used as a ground control method for the applicability as well as the limitations of mechanized longwall mining design in weak strata conditions.

关键词： Coal geotechnics Ground control Longwall mining Numerical methods

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Contributions of Engineering Geological Properties of Subgrade Soils to Premature Failure of Major Highways in Southwestern Nigeria:A Case Study of Akure-Ikere Ekiti Highway

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Journal of Physical Science and Application 2023年第1期13卷 15-27页

作者： O.B.Ajiboye Department of Civil Engineering Technology Rufus Giwa PolytechnicOwoOndo StateNigeria

Geotechnical analyses were carried out to examine the contributions of engineering geological properties of subgrade soils to the failure of the Akure-Ikere Ekiti road,Southwestern *** observations revealed that the road is in a very poor state of serious deformation and disrepair as most parts of the road alignment have *** alignment of the studied road is predominantly underlain by Granite,Charnockites,and *** tests results showed that the natural moisture content ranges from 10.98 to 21.4%,liquid limit from 22.8 to 47.7%,plastic limit from 19.2 to 24.6,plasticity index 3.6 to 26.3%.The grain size analysis revealed that the amount of fines ranges from 15.9 to 49%.Others are linear shrinkage,between 1.4 and 10%,free swell between 25 and 46%,maximum dry density from 1593 to 2016 kg/m,and CBR between 5 and 48%.The specific gravity ranges from 2.64 to *** reference to AASHTO classification,5% of the samples was classified as A-4,15% classified as A-2-4,40% classified as A-6,while 40% classified as *** dominance of fair-to-good California bearing ratio,fair to good maximum dry density,high linear shrinkage and A-7-6,A-6,and A-2-4 soil groups have combined to give fair-to-good geotechnical properties to the studied ***,the fair to good geotechnical properties of soil of the road under study is an indication that the contribution of subgrade soil to the failure of the highway is *** total breakdown of the road can be traced to substandard engineering specifications which are complemented by a poor drainage system.

关键词： Subgrade geotechnics failure compaction Akure Ikere-Ekiti

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