Civil engineering works require the selection of soil-type materials and the assessment of their geomechanical characteristics. However, the lack of relevant geotechnical mapping to facilitate the prediction of granul...Civil engineering works require the selection of soil-type materials and the assessment of their geomechanical characteristics. However, the lack of relevant geotechnical mapping to facilitate the prediction of granular material zones for civil engineering works in Benin means that very costly and sometimes inconclusive prospecting has to be undertaken for each project. The aim of this study is to contribute to the availability of geotechnical mapping in Benin. For this purpose, and in order to capitalize on the data, the proposed methodological approach is based on the systematic and controlled recording of data produced by laboratories during geotechnical and geological surveys for road construction projects. To this end, a web platform called ROAD MAT has been designed for data recording. This platform has been tested using data from test results from sixteen boreholes drilled in the Mono department. These results show a predominance of soil class G2 and CBR class P2. The database is steadily expanding, and its use by stakeholders will make it possible to collect and centralize vital data to define benchmarks for greater control of geotechnical risks. This work therefore constitutes a blueprint for the development of geotechnical mapping in Benin.展开更多
This work consisted in determining the geotechnical properties of the soil of the Cubitermes termite mound soil treated with lime for use in road construction in accordance with the relevant standards. The raw soil is...This work consisted in determining the geotechnical properties of the soil of the Cubitermes termite mound soil treated with lime for use in road construction in accordance with the relevant standards. The raw soil is composed of 29.45% clay, 45.12% silt and 25.43% sand, and its granulometric curve is above the relevant standard curve. The addition of lime up to 9% decreases the fine fraction content from 75% to 60%, and the maximum dry density from 1.62 t/m3 to 1.36 t/m3. The reduction of the fine fraction should reduce the soil sensitivity to water, and the emission of dust from the road. The compressive strength of the raw soil (3.89 MPa) is higher than that of most cohesive soil, and is probably one the causes of the longevity of the rural road paved with this soil. Treated soil with 6% in lime content has the highest compressive strength (5.95 MPa), and the lowest deformation at failure. Until 28 days, the improvement of the compressive upon the curing time is almost the same for untreated and treated termite mound soils. Thus, this improvement could be mostly attributed to the drying of the samples instead to the pozzolanic reactions. Besides, adding lime also enhances the shear strength of soil. Therefore, adding lime up to 6% in content to the termite mound soil should improve its behavior as surface roads.展开更多
文摘Civil engineering works require the selection of soil-type materials and the assessment of their geomechanical characteristics. However, the lack of relevant geotechnical mapping to facilitate the prediction of granular material zones for civil engineering works in Benin means that very costly and sometimes inconclusive prospecting has to be undertaken for each project. The aim of this study is to contribute to the availability of geotechnical mapping in Benin. For this purpose, and in order to capitalize on the data, the proposed methodological approach is based on the systematic and controlled recording of data produced by laboratories during geotechnical and geological surveys for road construction projects. To this end, a web platform called ROAD MAT has been designed for data recording. This platform has been tested using data from test results from sixteen boreholes drilled in the Mono department. These results show a predominance of soil class G2 and CBR class P2. The database is steadily expanding, and its use by stakeholders will make it possible to collect and centralize vital data to define benchmarks for greater control of geotechnical risks. This work therefore constitutes a blueprint for the development of geotechnical mapping in Benin.
文摘This work consisted in determining the geotechnical properties of the soil of the Cubitermes termite mound soil treated with lime for use in road construction in accordance with the relevant standards. The raw soil is composed of 29.45% clay, 45.12% silt and 25.43% sand, and its granulometric curve is above the relevant standard curve. The addition of lime up to 9% decreases the fine fraction content from 75% to 60%, and the maximum dry density from 1.62 t/m3 to 1.36 t/m3. The reduction of the fine fraction should reduce the soil sensitivity to water, and the emission of dust from the road. The compressive strength of the raw soil (3.89 MPa) is higher than that of most cohesive soil, and is probably one the causes of the longevity of the rural road paved with this soil. Treated soil with 6% in lime content has the highest compressive strength (5.95 MPa), and the lowest deformation at failure. Until 28 days, the improvement of the compressive upon the curing time is almost the same for untreated and treated termite mound soils. Thus, this improvement could be mostly attributed to the drying of the samples instead to the pozzolanic reactions. Besides, adding lime also enhances the shear strength of soil. Therefore, adding lime up to 6% in content to the termite mound soil should improve its behavior as surface roads.
