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Strategies for Advancing Road Construction Slope Stability: Unveiling Innovative Techniques for Managing Unstable Terrain

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Open Journal of Civil Engineering 2023年第4期13卷 572-616页

作者： Guy Oyéniran Adeoti judicaël koffi agbelele Crespin Prudence Yabi Rufin Nongnidé Kinhoun Éric Adéchina Alamou laboratory of Testing and Studies in Civil Engineering (l2EGC) National University of Science Technology Engineering and Mathematics (UNSTIM) Department of Zou Abomey Republic of Benin National School of Technical Education (ENSET) Lokossa Republic of Benin

This comprehensive review paper explores various aspects of geotechnical engineering, with a focus on the management of unstable terrains, numerical methods for solving complex soil and consolidation problems, rheological analysis of suspensions and muddy soils, and stability analysis of slopes. It begins by examining the unique physicochemical properties of cohesive sediments, including cohesion and specific surface area. The temporal evolution of deposit concentration and average bed concentration in unstable terrains is discussed, along with settling behavior of isolated particles and hindered settling using empirical equations. Key sedimentation theories, such as Kynch’s theory, and geotechnical consolidation theories, including Terzaghi’s consolidation equation and Gibson’s theory, are presented. The investigation interrelates these theories and principles to offer a holistic view of managing unstable terrains. It also addresses the challenges associated with experimental determination of constitutive relationships and presents alternative simplification methods proposed by researchers. Additionally, it delves into numerical methods for solving nonlinear partial differential equations governing soil behavior, emphasizing the need for numerical frameworks and discussing various techniques and associated challenges. The rheological analysis section covers material flow behavior, rheological behavior models, and the rheological properties of water and cohesive sediment mixtures. Fundamental geotechnical calculations, constitutive laws, and failure criteria are explained, highlighting their relevance in geotechnical engineering applications. This paper provides a multidimensional perspective on geotechnical engineering, offering valuable insights into soil properties, consolidation processes, numerical methods, rheological analysis, and slope stability assessment for professionals in the field.

关键词： Consolidation Processes Managing Unstable Terrain Numerical Methods Safety Coefficient Slope Stability Assessment Soil Cohesion

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Critical Assessment of Slope Stability: A Case Study on the Toffo-lalo Road Project

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Modern Mechanical Engineering 2023年第4期13卷 77-100页

作者： Guy Oyéniran Adeoti judicaël koffi agbelele Crespin Prudence Yabi Rufin Nongnidé Kinhoun Éric Adéchina Alamou laboratory of Testing and Studies in Civil Engineering (l2EGC) National University of Science Technology Engineering and Mathematics (UNSTIM) Abomey Benin National School of Technical Education (ENSET) Lokossa Republic of Benin

This article systematically delves into a comprehensive analysis of the latest and most advanced techniques for the assessment of slope stability. It particularly focuses on strategies aimed at enhancing slope stability in road construction. In addition to this analysis, the article presents an illustrative case study centered on the Toffo-lalo Road Project. The core objective of this paper is to scrutinize the stability of large embankments in road construction, with a specific emphasis on the development and asphalt overlay of the Toffo-lalo road. This scrutiny is conducted through the utilization of stability calculation software, GEOSTUDIO2018, specifically its SlOPE/W module. Within this framework, a detailed model of the cutbank located at KP1+750-2+250 was meticulously developed. This model takes into account the physical-mechanical characteristics of the soil at the site, as well as the topographic layout. Its attributes include a cohesion value of 11.3 Kpa, a density of 16.57 KN/m3, and a friction angle of 27˚. The modeling results, employing the Morgenstern-Price method—an approach renowned for its adherence to equilibrium conditions and provision of precise results—conclude that the safety coefficient (Fs = 1.429) prior to any reinforcement signifies a critical state of slope stability. To address this, the article explores the implementation of reinforcement techniques, particularly focusing on rigid inclusions like nailing and piles. The modeling exercises reveal a noteworthy enhancement in the safety coefficient (Fs) post-reinforcement. Furthermore, the article undertakes a parametric study to optimize the reinforcement strategies. This analysis highlights that anchoring at 0˚ downward relative to the horizontal plane and employing a pile angle of 90˚ represent the most favorable approaches. These measures yield safety coefficients of 3.60 and 2.34, respectively, indicating substantially improved slope stability.

关键词： GEOSlOPE Morgenstern-Price Method Numerical Modelling Safety Coefficient Soil Cohesion and Slope Stability

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Influence of Some Plant Fibers on the Mechanical Performance of Composite Materials

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Open Journal of Civil Engineering 2023年第4期13卷 814-826页

作者： Serge Pierre Quenum Yvette S. Tankpinou Kiki judicaël koffi agbelele Crespin Prudence Yabi Edmond Codjo Adjovi laboratoire de Procédés et d’Innovation Technologique UNSTIM Abomey Benin laboratoire Pluridisciplinaire de l’Enseignement Technique UNSTIM Abomey Benin laboratoire d’Etudes et d’Essais en Génie-Civil UNSTIM Abomey Benin

This work focused on the search for biobased materials capable of being used in road techniques as soil inclusions, and on studying the influence of their incorporation on the characteristic parameters of pavement layers. To this end, pineapple, cyperus and imperata plant fibers, due to their endemic availability, were used as reinforcement on sourced materials, notably bar soil, lateritic gravel and silty sand. Complete identification and mechanical tests (Proctor and CBR) were carried out on materials in their natural state (soil) and on composite materials (soil + plant fibers) in the laboratory to determine their classification in road geotechnics, their compaction parameters and their mechanical behavior. Firstly, the various types of 2.5 cm long fibers were incorporated into the different types of soil at mass contents of 1% and 2%. This part of the study showed that the pineapple fiber composite incorporated into class A2 bar soil offered the best results, with a 38% gain in CBR index compared with the natural soil. Pineapple fibers incorporated at 1% in lateritic gravel raise the CBR value of the reinforced soil to 10% of the CBR value of the natural soil and to 7% for silty sand.

关键词： Plant Fibers Soils Composite Materials Reinforcement

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Stabilization of Clay Soil for the Durability of Structures: Case Study of the Soils of the locality of Zalimé, Commune of Zogbodomey in the Republic of Benin

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Open Journal of Civil Engineering 2023年第1期13卷 103-112页

作者： koffi judicaël agbelele Ernesto Cabral Houehanou Abalo P’Kla Isaac Ai Dossou Houngan Comlan Aristide Higher Normal School of Technical Education (ENSET) National University of Sciences Technologies Engineering and Mathematics (UNSTIM) Abomey Benin laboroty of Energy and Applied Mechanics (lEMA) Polytechnic School of Abomey-Calavi (EPAC) Abomey-Calavi Benin National Higher Institute of Industrial Technology (INSTI) National University of Science Technology Engineering and Mathematics (UNSTIM) Abomey Benin Polytechnic School of lomé University of Lomé (UL) Lomé Togo Verechaguine AK Civil Engineering School (ESGC-VAK) Gbegamey Benin

Structures erected on swelling clay soils are subjected to several stresses which are at the origin of the premature deterioration of the infrastructures. The soils being supports for the works, the improvement of their weak characteristics with cotton fibers will not only increase the bearing capacities of these soils and the resolution of the environmental problem, by eliminating the CO2 produced by the burning of the stems after harvest. The objective of this study is to contribute to the improvement of the characteristics by cotton stalk powder of the swelling clay soils used as the foundation of the infrastructures in order to guarantee their durability. Identification and mechanical parameterization tests were carried out on raw soil samples taken at 1.5 meters deep and on samples improved with cotton stalk powder at different levels (3%, 6% and 10%). The results from the physical tests reveal that the soil studied is very plastic silt. As for the mechanical tests, it appears that by adding 3% cotton stalk powder to dry density which goes from 1.435 t/m3 compared to the control sample with a dry density of 1.50 t/m3;which reflects an improvement in the compaction characteristics of the soil studied. The dry densities are 1.445 t/m3 and 1.29 t/m3 for the samples improved with 6% and 10% cotton stalk powder.

关键词： Improvement Swelling Clay Cotton Stalk Powder Silt Dry Density

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Identification of Empirical Models for the Prediction of the Plasticity Index:Case of the KhôDepression in South Benin

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材料科学与工程（中英文A版） 2022年第2期12卷 55-66页

作者： koffi judicaël agbelele Yvette Sèdjro TANKPINOU KIKI Abalo P’KlA Gbênihon Céleste-Amour KENOUKON Normal Higher School of Technical Education(ENSET) National University of Science Technology Engineering and Mathematics(UNSTIM)BP 133AbomeyBenin Higher National Institute of Industrial Technology(INSTI) National University of Science Technology Engineering and Mathematics(UNSTIM)01 BP 551AbomeyBenin laboratory of Energy and Applied Mechanics(lEMA) EPACUAC01 BP 2009 CotonouBenin Higher National Engineering School(ENSI)of the University of lomé(Ul) BP 1515 LoméTogo National School of Public Works(ENSTP) National University of Science Technology Engineering and Mathematics(UNSTIM)BP 2282AbomeyBenin

The plasticity index is an essential design parameter used as a standard input in fine-grained soil investigation *** is used to estimate the plasticity and physical properties of soils,and indirectly their strength *** index is determined from the Atterberg limit tests,starting from the limits of liquidity and ***,the realization of the test considered as basic and simple,is not so *** effects of the operator,the calibration of the apparatus and the environmental aspects during the tests affect the reliability and accuracy of the *** this paper,the objective is to overcome these difficulties by evaluating the plasticity index of clay and loam soils by considering only the values of the liquid *** samples were collected from 0 to 5 m depth in the localities of the Khôdepression in *** these samples,Atterberg limit tests were performed in the *** MATlAB’s Curve Fitting Toolbox,linear,exponential and power prediction models were *** results showed that there is indeed a good correlation between the plasticity index and the liquid limit of the *** the linear model,it was observed R2 equal to *** the exponential model,R2 is 0.98871 and for the power model 0.9802.A study of the residual plot validated the models found,as well as comparisons with well-known literature *** the equations obtained,it is now possible to study the plasticity of soils in the Khôdepression only from the liquid limit,without determining the plasticity limit.

关键词： Plasticity index liquidity limit prediction regression model lama depression Khôdepression

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Study of the Thermal Characteristics of a Geomaterial:Case of SavèGranites in the Republic of Benin

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Journal of Environmental Science and Engineering(A) 2023年第4期12卷 151-161页

作者： koffi judicaël agbelele Daniel Yemalin Agossou Kocouvi Agapi Houanou Bachir Kolade Adelakoun Ambelohoun Sakala Complice Decoursel Curtis Gérard Gbaguidi Aïsse Higher Normal School of Technical Education(ENSET) LokossaRepublic of Benin laboratory of Materials and Structures(lAMS) Verechaguine AK Higher SchoolCotonouRepublic of Benin laboratory of Energetics and Applied Mechanics(lEMA) EPAC UACAbomey-CalaviRepublic of Benin Civil Engineering Testing and Research laboratory(l2EGC) ENSTPAbomeyRepublic of Benin

This work focuses on the valorization of local *** rock that is granite,a material used in construction thanks to its mechanical resistance,is the subject of our *** granite of the commune of Savè,made it possible to appreciate the thermal behavior of this rock studied with a view to its use as a building *** this end,a thermal diffusivity measurement test was carried out on this ***,we made samples which were then connected to a data acquisition box via thermocouples.A Python script is used to ensure the collection of temperature values over *** this thermal diffusivity test carried out on the granite taken from the Savèbreasts,we obtained an average diffusivity a=5.84×10^(-6)m^(2)/*** a result,the thermal effusivity and the heat capacity of the material were determined having respectively the value 1,351.09 J/(K·m^(2)·s^(1/2))and 547,945.21 J/(m^(3)·K).These different results highlight a thermal characterization of Savègranites as a relevant material in the design and construction of an energy-efficient eco-housing.

关键词： local materials thermal diffusivity thermal conductivity thermal effusivity heat capacity

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Critical review of the impact of cover crops on soil properties

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International Soil and Water Conservation Research 2022年第3期10卷 343-354页

作者： Komlan Koudahe Samuel CAllen koffi Djaman Biological and Agricultural Engineering Department Kansas State University1016 Seaton Hall920 N.Martin Luther King Jr.DriveManhattanKS66506USA Department of Plant and Environmental Sciences New Mexico State UniversityAgricultural Science Center at FarmingtonP.O.Box 1018FarmingtonNM87499USA

Grasses as well as leguminous and non-leguminous broadleaves are the major categories of commonly grown cover crops *** review focuses on the contribution of cover crops to soil *** review first considers the single and mixed cover crops and shows that grass species are desirable for their decay and ability to provide substantial soil cover,broadleaf species are used for their quick decomposition and capacity of releasing residues into the soil,while the leguminous species are used for their ability to fix atmospheric ***,the impacts of cover crops on soil health are *** cover crops into conventional cropping systems may reduce soil bulk density,improve soil structure and hydraulic properties to facilitate increased water infiltration and *** residue additions from cover crops may enhance soil organic C and N accretion as well as increase availability of P,K,Ca,Fe and Mg in some soil types under certain climatic ***,cover crops may provide a better condition for microbial activity,abundance,and ***,the review shows that through proper management,cover crops may be utilized as an essential component of soil conservation practices for enhanced soil ***,further investigation is necessary to determine cover crop effects in additional cropping systems and climatic zones as well as the long-term effects of cover crops on soil properties,subsequent crop yield,and overall cropping system *** review is an important source of information for crop growers,crop management institutions,universities,and crop consultants for sustainable agricultural production.

关键词： Cover crops Soil properties Grasses leguminous

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Study of Slope Stability Using the Bishop Slice Method: An Approach Combining Analytical and Numerical Analyses

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Open Journal of Applied Sciences 2023年第8期13卷 1446-1456页

作者： koffi judicael agbelele Guy Oyeniran Adeoti Daniel Yémalin Agossou Gérard Gbaguidi Aïsse National School of Technical Education (ENSET) Lokossa Republic of Benin National University of Sciences Technology Engineering and Mathematics (UNSTIM) Abomey Republic of Benin laboratory of Test and Studies in Civil Engineering (l2EGC) Abomey Republic of Benin Materials and Structures laboratory (lAMS) Cotonou Republic of Benin

The importance of slope stability in civil engineering cannot be underestimated, as failure of these structures can result in significant damage to downstream infrastructure and property. In this study, we used the Bishop slice method, combining both an analytical approach and a numerical approach using the SlOPE/W module of the Geostudio 2018 R2 software. The results obtained from these two methods showed that increasing soil cohesion helps to improve slope stability. The safety coefficients obtained by the analytical method vary between 0.621 and 1.422, while those obtained by the numerical method vary between 0.622 and 1.447, for cohesion values ranging from 4 kPa to 20 kPa. The results obtained by these two methods show a linear relationship between the safety coefficients and soil cohesion. The equation of the analytical method is y = 0.0496x + 0.4407, while that of the numerical method is y = 0.0512x + 0.4357. The results of the analytical approach indicate that a safety coefficient of 1.5 is reached when the cohesion reaches a value of 22 kPa, while the numerical approach shows a safety coefficient of 1.5 reached at a cohesion of 21 kPa. The difference between these two cohesion values can be explained by the number of slices used, which is smaller in the analytical method. However, the equation derived from the analytical method can be used as a general guide to assess the evolution of the safety coefficient of an overloaded slope in long-term behaviour with an increase in cohesion. However, it is important to stress the importance of verification using specialised software based on the finite element method.

关键词： Slope Stability Safety Factor Cohesion

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Microbiological and chemical hazards of commercial attieke (a fermented cassava product) produced in the south of Côte d’Ivoire

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Food Quality and Safety 2019年第3期3卷 187-190页

作者： Kouamé Kohi Alfred Bouatenin koffi Maizan Jean Pau Djeni N’Dede Théodore Dje koffi Marcellin Department of Food Sciences and Technology Laboratory of Biotechnology and food MicrobiologyUniversity of Nangui AbrogouaAbidjanCôte d’Ivoire Food Security Research Group Centre Suisse de Recherche ScientifiqueAbidjanCote d’Ivoire

Objectives:Information on the distribution and presence of microbiology and chemical hazard of commercial attieke(a fermented cassava product)produced in the south of Côte d’Ivoire were *** and Methods:Microbiological analyses and chemical were carried out,which included the total viable bacteria,Staphylococcus aureus,Salmonella and Bacillus spores,heavy metal(pb,Cd,Mn,Fe,Cu,and Cr).Results and Conclusions:The results revealed that the viable bacteria counts ranged from in all of *** aureus counts in the samples were comprised between(1.8±0.4)10^(2)(Jacqueville localitie)and(4.3±1.8)10^(3)(Abidjan localitie).While that of Bacillus cereus was ranged from(1.1±0.9)10^(2)(Adzopélocalitie)and(5.1±3.2)10^(2)(Abidjan localitie).Salmonella *** not *** levels of Pb in all samples were between 2.2±0.1 mg/kg(Grand-lahou localitie)and 4.5 mg/kg±0.15(Abidjan localitie)while the Cd levels of the samples varied between 0.02±0.1 mg/kg(Adzopélocalitie)and 0.07±0.1 mg/kg(Divo localitie).The levels of Cr in the samples were comprised between 0.1±0.03 mg/kg(Adzopélocalitie)and 0.95±0.1 mg/kg(Abidjan localitie)while Fe(7.3±1.5 mg/kg)and Cu(1.7±0.2 mg/kg)levels were the highest,respectively in Sikensi and Grand-lahou *** from Divo localitie contained high amounts of Mn(1.6±0.1 mg/kg).The occurrence of some microbiological and chemical hazard that commercial attieke collected in Cote d’Ivoire may act as a reservoir of pathogenic micro-organisms and heavy metal for human.

关键词： attieke heavy metal microbiogical and chemical hazard

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Alternate phenotype–genotype selection for developing superior high-yielding irrigated rice lines

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The Crop Journal 2018年第2期6卷 191-201页

作者： Yonnelle Dea Moukoumbi Raafat El-Namaky koffi Djaman Daouda Mbodj Baboucarr Manneh Irrigated Rice Breeding Unit Africa Rice Center(Africa Rice)Sahel Regional StationBP 96 Saint LouisSenegal National Institute of Agricultural Research Gros bouquetPMB 16169LibrevilleGabon Rice Research&Training Center(RRTC) 33717 Sakha Kafr SheikhEgypt

Increase grain yield potential is one of the most important objectives of any cereal crop breeding program. To efficiently develop superior rice lines by the introgression of favorable alleles for yield and yield component traits, a strategy of alternate phenotype–genotype selection was used. The present study aimed to(i) investigate the allelic diversity of loci associated with major yield-component traits and(ii) phenotype and genotype advanced populations derived from crosses between NERICA-l-20 and Giza178 for yield component traits using agro-morphological descriptors and GRi SP polymorphic markers to select superior high-yielding rice lines. A total of 100 F2:3 progeny were selected from 1000 F2 plants and genotyped with 16 polymorphic markers linked to four major yield-component traits. Four promising F2:3 lines(ARS 563–14, ARS 563–62, ARS 563–286, and ARS 563–41)bearing combinations of desirable alleles were selected. A selected set of 20 F2:4 lines showed moderate to high heritability for all target traits. Fourteen F2:5 lines derived from ARS 563–14 and 17 F2:5 from ARS 563–286 families were evaluated in preliminary trials to estimate yield gain. The three top lines, ARS 563–286–16-1-1, ARS 563–286–5-1-1, and ARS563–14–10-1-1, showed an increase of more than 10% grain yield over the best check, Sahel108, which is widely cultivated in the Senegal River valley. The 16 markers linked to the target yield component traits can be used to fast-track breeding programs targeting rice productivity.

关键词： Marker Rice Pedigree selection Yield

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