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
Land subsidence phenomena caused by the overexploitation of the aquifers require the holistic knowledge of the geological, tectonic, hydrogeological and especially the geotechnical conditions of the affected sites in ...Land subsidence phenomena caused by the overexploitation of the aquifers require the holistic knowledge of the geological, tectonic, hydrogeological and especially the geotechnical conditions of the affected sites in order to be mitigated. The current paper focuses on the study of the phenomena taking place at the Amyntaio sub-basin, northern Greece, hosting the homonymous open pit coal mine,operating there the last two decades. The mining as well as the rising agriculture activities have led to a significant drawdown of the ground water level triggering extensive ground subsidence phenomena,causing damages at the nearby villages, infrastructure and farmlands. The production and evaluation of engineering geological–geotechnical maps as well as of thematic tectonic and hydrogeological maps proved that the knowledge of this data is crucial for the interpretation of the land subsidence mechanism and the spatial distribution of its effects.展开更多
To enhance the general knowledge of landslides in China, the DAAD （German Academic Exchange Service） is financing an investigative project. As part of this project, at the Qingjiang （清江） River, a 10 km^2 area do...To enhance the general knowledge of landslides in China, the DAAD （German Academic Exchange Service） is financing an investigative project. As part of this project, at the Qingjiang （清江） River, a 10 km^2 area downstream of the Shuibuya （水布垭） dam site was geologically and geotechnicaUy mapped to gather information concerning landslides and their correlation to lithology, slope angles and texture. The geological mapping contained the characterization of the lithological units. The characterization of the shape of landslides and the classification of rocks into units with similar geotechnical behavior is contained in the geotechnical map. Samples were taken and investigated using X-ray diffraction to identify the clay minerals and geotechnical tests to determine the effective shear angle and cohesion of rocks and soils. Geotechnical mapping showed a close connection between lithology, slope angle and texture concerning the occurrence of landslides. Most landslides occur on the northern bank of the Qingjiang River where the dip angle of the bedding is nearly parallel to the slope, resulting in potential and effective slide planes. On the southern bank only sporadic and small landslides occur because the bedding is antipodal to the slope angle. This pilot work is a base for further and more detailed investigations in this area.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Land subsidence phenomena caused by the overexploitation of the aquifers require the holistic knowledge of the geological, tectonic, hydrogeological and especially the geotechnical conditions of the affected sites in order to be mitigated. The current paper focuses on the study of the phenomena taking place at the Amyntaio sub-basin, northern Greece, hosting the homonymous open pit coal mine,operating there the last two decades. The mining as well as the rising agriculture activities have led to a significant drawdown of the ground water level triggering extensive ground subsidence phenomena,causing damages at the nearby villages, infrastructure and farmlands. The production and evaluation of engineering geological–geotechnical maps as well as of thematic tectonic and hydrogeological maps proved that the knowledge of this data is crucial for the interpretation of the land subsidence mechanism and the spatial distribution of its effects.
基金This paper is supported by the DAAD ( German Academic ExchangeService) within the project"Landslides after Heavy Rainfallsin China".
文摘To enhance the general knowledge of landslides in China, the DAAD （German Academic Exchange Service） is financing an investigative project. As part of this project, at the Qingjiang （清江） River, a 10 km^2 area downstream of the Shuibuya （水布垭） dam site was geologically and geotechnicaUy mapped to gather information concerning landslides and their correlation to lithology, slope angles and texture. The geological mapping contained the characterization of the lithological units. The characterization of the shape of landslides and the classification of rocks into units with similar geotechnical behavior is contained in the geotechnical map. Samples were taken and investigated using X-ray diffraction to identify the clay minerals and geotechnical tests to determine the effective shear angle and cohesion of rocks and soils. Geotechnical mapping showed a close connection between lithology, slope angle and texture concerning the occurrence of landslides. Most landslides occur on the northern bank of the Qingjiang River where the dip angle of the bedding is nearly parallel to the slope, resulting in potential and effective slide planes. On the southern bank only sporadic and small landslides occur because the bedding is antipodal to the slope angle. This pilot work is a base for further and more detailed investigations in this area.
