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地质材料(英文) 2023年第4期13卷 109-123页

作者： hamma fabien yonli Michée Banyua Lompo Nicolas Kagambega Pierre Sawadogo Ecole Supérieure d’Ingénierie Universitéde Fada N’Gourma Fada N’Gourma Burkina Faso Laboratoire de Physique et de Chimie de l’Environnement Université Joseph KI-ZERBO Ouagadougou Burkina Faso Mine Service Technique IAMGOLD ESSAKANE SA Ouagadougou Burkina Faso Laboratoire Géosciences et Environnement Ouagadougou Burkina Faso

Knowledge of the state of stability of mining pits is both a basic condition, an essential axis and a safety benchmark for mining operations. This stability is largely based on the knowledge of the rock mass sheltering the mining works and this requires a perfect characterization of all of its structural formations through mapping (manual or digital). The families of discontinuities, namely family 1 (bedding), family 2 (Joint 2) and family 3 (Joint 1) obtained through structural mapping in the Essakane open pit mine, made it possible to analyze the failure modes at the origin of rock instabilities. The respective dips of these different directional families are: 77˚ - 85˚/N 058˚ - 068˚, 66˚ - 74˚/N 133˚ - 143˚, 25˚ - 35˚/N115˚ - 130˚. An average safety factor of 4.3 was estimated for the area with a quality of the rock mass (RMR) estimated at 47. The results obtained reflect on the one hand the risks of instability associated with the quality of the rock mass studied and on the other hand highlights the state of stability of the study area.

关键词： Stability Cartography Discontinuities Safety Factor Essakane

Thermal Effect of Braking on Pavements during Heat Waves in Ouagadougou

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Materials Sciences and Applications 2023年第7期14卷 382-396页

作者： Sidpouita Mathilde Koudougou hamma fabien yonli Moussa Sougoti David Yemboini Kader Toguyeni Institut du Génie des Systèmes Industriels de Textiles Ecole Polytechnique de Ouagadougou Ouagadougou Burkina Faso Laboratoire de Physique et de Chimie de l’Environnement Ouagadougou Burkina Faso Université de Fada N’Gourma Fada N’Gourma Burkina Faso Université Joseph Ki-Zerbo Ouagadougou Burkina Faso

Flexible pavements, whose surface layers are made from hot mix asphalt, may show rutting in some of these infrastructures during the first months of life. In the city of Ouagadougou, this rutting phenomenon is sometimes observed. The objective of this article is to quantify the thermal response of the wearing course of national roads 1 and 2, when they are subjected to the braking of heavy trucks of 13 tons and 20 tons per axle. The meteorological conditions retained are those of the Burkinabe climate. The evaluation of the temperature was carried out by numerical simulation using the Comsol Multiphysics 5.2 software. This study showed that the thermal response of the pavement to the combined effects of surface temperature, overloading by a 20 tons heavy truck and braking during a heat wave increase in pavement surface temperature ranging from 1.09% for National Road 1 to 0.91% for National Road 2, particularly in the braking zone. This made it possible to establish the diagnosis according to which the nature of the bitumen used on the wearing course can reduce rigidity modulus. In predictive terms, they allowed us to deduce that an under-dimensioning of the wearing course, even if the bitumen was used is adequate.

关键词： Road Modeling Finite Elements Thermomechanical Tropical Climate

Hydrogeological Characterization of Continental Terminal and Oligo-Miocene Aquifers in the Tambacounda-Kaffrine Zone(Senegal)

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Journal of Environmental Science and Engineering(A) 2023年第1期12卷 27-36页

作者： hamma fabien yonli Mahamadou Koita Serigne Ahmadou Bamba Mar Abdoulaye Cissé Ecole Supérieure d’Ingénierie Universitéde Fada N’GourmaBP 54 Fada N’GourmaBurkina Faso Laboratoire de Physique et de Chimie de l’Environnement(LPCE) UniversitéJoseph KI-ZERBOBP 7021 Ouagadougou 03Burkina Faso Laboratoire Eaux Hydro-Systèmes et Agriculture(LEHSA) Institut International d’Ingénierie de l’Eau et de l’Environnement(2iE)01 BP 594 Ouagadougou 01Burkina Faso Direction de la Gestion et de la Planification des Ressources en Eau BP 14484 DakarSénégal

This study aims to make a hydrogeological characterization of the aquifers of the Continental Terminal and the Oligo-Miocene.To do so,an analysis is conducted on the basis of hydrogeological parameters from 172 boreholes,10 of which are used for groundwater levels and flows analysis.The results of the statistical analysis of the hydrogeological parameters show that the average flow rate is 42.29 m^(3)/h,the average specific flow rate is 5.96 m^(3)/h/m,and the average transmissivity is 0.024 m^(2)/s.These values highlight the high productivity of aquifers from the Continental Terminal and the Oligo-Miocene.The results of piezometry showed that water flows from the south center to the northwest of Tambacounda where the largest depression is located and could even be the outlet of the system.The groundwater fluctuations between low water level and high water level seasons reveal a rise in the piezometric surface of the aquifers at the scale of the study area.

关键词： Aquifer productivity piezometry Continental Terminal Oligo-Miocene

Hydrogeophysical Characterization of a Fractured Aquifer by Using Cumulative Resistivity Method:Case Study of Obuasi Aquifer(Ghana)

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Journal of Environmental Science and Engineering(A) 2022年第5期11卷 182-193页

作者： hamma fabien yonli Mahamadou Koïta Younaise Sounkanmi Olouwachéyi Adéotan Elisabeth Darko Ecole Supérieure d’Ingénierie Universitéde Fada N’GourmaBP 54 Fada N’GourmaBurkina Faso Laboratoire de Physique et de Chimie de l’Environnement(LPCE) UniversitéJoseph KI-ZERBOBP 7021 Ouagadougou 03Burkina Faso Institut International d’Ingénierie de l’Eau et de l’Environnement Rue de la Science01 BP 594 OuagadougouBurkina Faso Ghana Water Company Limited(GWCL) P.O.Box 377Adum KumasiGhana

Knowledge of the structure and geometry of aquifers is an important prerequisite when one wishes to sit a borehole.Such knowledge is currently obtained by VES(Vertical Electrical Soundings)whose interpretation is not always unequivocal in the sense that several resistivity models derived from VES can explain the same data set.The present study conducted in Obuasi region in Ghana aims at demonstrating the robustness of“cumulative resistivity”method in the characterization of the geometry of aquifers.The methodology developed consisted firstly in carrying out VES.These measurements were then interpreted using“cumulative resistivity method”.Secondly,drillings are conducted at the VES sites and lithologs established from cuttings were compared to the results from VES interpretation.The study reveals that the investigated aquifer consists of a resistant layer consisting of phyllite over 30-40 m topped by a conductive layer of reddish clay 20-30 m thick.These two layers rest on a lower electrical conductivity formation downward.This description can be considered as a typical alteration profile in a volcano sedimentary context.The results also show that the method is quite precise in half of the cases studied but sometimes it is impossible to get rid of the phenomenon of suppression since several layers are merged into a single layer.

关键词： Aquifer cumulative resistivity drilling alteration

Optimizing the Interpretation of Sub-surface Resistivity in Relation with Borehole Productivity in Basement Area Applied to Seno Province （Burkina Faso）

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Journal of Environmental Science and Engineering(B) 2016年第12期5卷 563-580页

作者： Mahamadou Koita hamma fabien yonli Delwende Guy Christian Nikiema Department of Civil Engineering and Hydraulics the International Institute for Water and Environmental Engineering BP 594 Ouagadougou 01 Burkina Faso Department of Physics and Environmental Chemistry the University of Ouaga 1 Pr Joseph K1 ZERBO BP 7021 Ouagadougou 03Burkina Faso

Study of the Influence of a Young Synthetic Leachate on the Hydromechanical Properties of a Swelling Clay

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Journal of Environmental Science and Engineering(B) 2017年第11期6卷 569-581页

作者： hamma fabien yonli David Yemboini Kader Toguyeni Moussa Sougoti Department of Physics the University Ouaga I Pr Joseph KI-ZERBO BP 7021 Ouagadougou 03 Burkina Faso Department of Civil Engineering the University of Fada N'Gourma BP 46 Fada N'Gourma Burkina Faso

Evaluation of Water Losses by Evaporation in the Nakanbe Basin

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Atmospheric and Climate Sciences 2024年第1期14卷 29-41页

作者： Bayala Alfred Kabre Sayouba yonli hamma fabien Chesneau Xavier Thierry Sikoudouin Maurice Ky Zeghmati Belkacem Kieno P. Florent Kam Sié Unité de Formation et de Recherche en Sciences Exactes et Appliquées (UFR/SEA) Laboratoire d’Energies Thermiques Renouvelables (LETRE) Université Joseph KI-ZERBO Ouagadougou Burkina Faso Unité de Formation et de recherche en Science Exactes et Appliquées Centre Universitaire de Kaya (CU-K) Perpignan France Laboratoire de Modélisation Pluridisciplinaire et Simulation Université de Perpignan Via Domitia Perpignan France Unité de Formation et de Recherche en Sciences Exactes et Appliquées (UFR/SEA) Laboratoire de Matériaux et Environnement Uni-versité Joseph KI-ZERBO Ouagadougou Burkina Faso Laboratoire de Physique et Chimie de l’ Environnement (LPCE) Université Joseph KI-ZERBO Ouagadougou Burkina Faso

A numerical approach to heat and mass transfer in a large water reservoir is presented. This water reservoir is likened to a parallelepiped reservoir whose vertical and lower walls are adiabatic and impermeable. The equations that govern natural convection in water are solved by the finite volume method and Thomas’salgorithm. The adequacy between the velocity and pressure fields is ensured by the SIMPLE algorithm. We are going to evaluate the water losses by evaporation from three dams in the Nakanbé basin in Burkina Faso for a period of thirty years, that is to say from January 1, 1991, to March 15, 2020. The three dams have a rate of evaporation greater than 40% of the volume of water stored. Indeed the rate of evaporation in each dam increases with the water filling rate in the reservoir: we have observed the following results for each dam in the Nakanbé basin;for the date of 02/27/1988 to 03/13/2020., the Loumbila dam received a total volume of stored water of 22.02 Mm3 and 10.57 Mm3 as the total volume of water evaporated at the same date. At the Ouaga dam (2 + 3), it stored a water volume of 4.06 Mm3 and evaporated 2.03 Mm3 of its storage volume from 01/01/1988 to 05/07/2016. Finally, with regard to the Bagré dam, it stored 745.16 Mm3 of water and 365.13 Mm3 as the volume of water evaporated from 01/01/1993 to 03/31/2020.

关键词： Numerical Study Evaporation Meteorological Data Natural Convection Basins Dams