检索结果-南通市图书馆

Journal of Geoscience and Environment Protection 2024年第3期12卷 181-191页

作者： Willy Chance Guimezap Kenou vladimir willianov keubou tatapzia Bertile Ilalie Manefouet Institut Universitaire de la cô te P&#244le de Recherche de l&#8217Inovation et de l&#8217Entreprenariat (PRIE) Douala Cameroun Faculty of Sciences University of Dschang Dschang Cameroon

The materials studied were lateritic soils from Souza-Mbanga-Cameroon, with a view to their better use in road geotechnics. In order to achieve the set objective, the work was carried out in two phases, firstly in the field, to provide a morpho-structural description of the soil profiles, followed by a laboratory phase to analyse the samples collected in the field. The results of the physical characterisation of the soil samples show that, for average values, the water content is 9.87%, the percentage of fines 48%, the plasticity index 21.6%, the liquidity limit 50.91%, and the consistency index 1.97. These soils are classified as silty sands in the LCPC classification and as fine soils in the GTR classification. The average value of the maximum dry density is 1.81 g/cm3 and that of the water content at the modified Proctor optimum is 16.24%. The CBR index is between 1.8% and 17.8%, showing that these soils belong to classes S1, S2, S3, S4 and S5. Souza-Mbanga lateritic soils can be used in their natural state as subgrades.

关键词： Soils Souza-Mbanga Characterisation CBR

Geotechnical Identification and Classification of Soils as Flexible Pavement Subgrade of the Section Fongo Tongo-Melong

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geoscience and Environment Protection 2020年第11期8卷 183-200页

作者： François Ngapgue Willy Chance Guimezap Kenou Jules Hermann Keyangue Tchouata vladimir willianov keubou tatapzia Yannick Mbeuteu Mbakop Research Unit of Mechanics and Physical Systems Modeling (UR2MPS) Faculty of Sciences University of Dschang Dschang Cameroon Laboratory of Engineering Industrial Systems and Environment (LISIE) FOTSO Victor University Institute of Technology University of Dschang Dschang Cameroon Laboratory of Environmental Geology Faculty of Sciences University of Dschang Dschang Cameroon Innovation Research Center Entrepreneurship (PRIE) Institut Universitaire de la Cote Douala Cameroon School of Geology and Mining Engineering (SGME) University of Ngaoundere Ngaoundere Cameroon Geotechnique Batiment et Travaux Publics (GEO TP) Douala Cameroon

The present study is inscribed within the framework of the geotechnical characterization of the soils of the Santchou plain, their classification for employment as pavement subgrade, various identification tests were carried out on the samples. The results obtained showed that with a wide range of different grain sizes, the studied soils showed low content in clay grains and dominance of either sand grains or silt grains, this can be explaining how most of these soil are poorly graded. According to the USDA textural classification, the grain size distribution of these soils makes them to be classified as Silty Loam types to Sandy Loam types. Despite of their organic matter content which is less than 10%, according to their respective methylene blue values, the soils studied along the section should be mainly loamy soil of medium plasticity to clayed soil, therefore showing a sensibility of its behavior to variation of water content. That last one is confirmed by the consistency parameters of these soils which show intermediate plasticity to highly plastic. Also, the bearing capacity proposed by these soils at their respective optimum dry densities is relatively small, although most of these experimental CBR values of the studied soils are more important than the ones prescribed by the AASHTO Classification system for A5, A6, and A7 types, and the French Highway Earthworks Manual Classifications system (GTR) for the corresponding A2 and A3 types.

关键词： Soil Classification Liquid Limit Natural Water Content Plasticity Index Methylene Blue Value Optimum Moisture Content California Bearing Ratio

Evaluation of the Effect of Lime Content on the California Bearing Ratio of Silty Soils: Case of Fombap District

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Geology 2020年第11期10卷 1059-1071页

作者： Willy Chance Guimezap Kenou François Ngapgue Jules Hermann Keyangue Tchouata vladimir willianov keubou tatapzia Walter Jovic Kenou Jogo Research Unit of Mechanics and Physical Systems Modeling (UR2MPS) Faculty of Sciences University of Dschang Dschang Cameroon Laboratory of Engineering Industrial Systems and Environment (LISIE) FOTSO Victor University Institute of Technology University of Dschang Dschang Cameroon Research Center for Innovation and Entrepreneurship (PRIE) Institut Universitaire de la Cote Douala Cameroon Laboratory of Environmental Geology Faculty of Sciences University of Dschang Dschang Cameroon School of Geology and Mining Engineering (SGME) University of Ngaoundéré Ngaoundéré Cameroon Faculty of Arts Humanities and Social Sciences (FALSH) University of Yaoundé 1 Yaoundé Cameroon

The present study is inscribed within the framework of the amelioration of the soils of the Santchou plain for employment as pavement subgrade. The bearing capacity proposed by these soils at their respective optimum dry densities is relatively small, although most of these experimental California Bearing Ratio (CBR) values of the studied soils are more important than the ones prescribed by the American Association of State Highway and Transportation Officials Classification system (AASHTO) for A5, A6, and A7 types. The stabilization of this soils with lime has been chosen to improve the bearing capacity and by association, their resilient modulus. The results of this study show that the increase of lime content is not proportional with the increase of the expected mechanical performances. In fact, the literature explains that when the lime content arrives at an optimum, the mechanical parameters no longer increase, but decrease significantly. After this optimum, the soil stabilization no longer shows advantages in the increase of geo-mechanical properties of soils.

关键词： Soil Classification Lime Content California Bearing Ratio Soil Stabilization Subgrade

Study of Sands from Bamendou-West Cameroon: Valorization for Concrete Mix Design

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geoscience and Environment Protection 2024年第5期12卷 345-354页

作者： keubou tatapzia vladimir willianov Guimezap Kenou Willy Chance Manefouet Bertile Ilalie Kamga Djoumen Tatiana Ngapgue François Faculty of Sciences University of Dschang Dschang Cameroon Institut universitaire de la Cô te Douala Cameroun Department of Civil Engineering FOTSO Victor University Institute of Technology University of Dschang Bandjoun Cameroon

Bamendou (West Cameroon), has a huge potential in natural resources, especially sands. However, the use of these materials in civil engineering works leads to the appearance of numerous pathologies which in some cases lead to the total ruin of the works. In order to overcome these infrastructural problems, the main objective of this study is set at the improvement of the service life of structures built in Cameroon using local materials formed under climatic, geological and geotechnical conditions similar to those of materials in Bamendou. Eight sand samples were taken from the most representative and exploited quarries. The identification and classification of the sand taken from the most representative quarries in the study area show that they are mainly clayey, with an average sand equivalent of 57.54. In terms of granulometry, the curves of several sand samples do not fall within the granular range of sands used in the formulation of concrete. The modulus of fineness obtained by particle size analysis varies from 2.91 to 3.92 with an average of 3.31.

关键词： Residual Sand Formulation of Concrete Sand Equivalent Fitness Modulus Particle Size Bamendou