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Engineering-geological evaluation of sites proposed for development in the dolomite karst regions of southern Africa
20A
901152 Aerial photographic mapping of granular materials for building and road construction in Ghana Kuma, D O K Proc Ninth Regional Conference for Africa on Soil Mechanics and Fomulation Engineering, Lagos, September 1987 VI, P545-550. Publ Rotterdam: A A Balkema, 1987 The applicability of photography for identification and location of granular materials, particularly laterites, in Ghana is discussed. The three types of granular material, transported superficial cover, residual superficial cover and quartzite gravels are described. The engineering geology and air photo characteristics of laterite crusts, laterite gravels and laterite residual fine grained soils are outlined.
901153 Survey of road construction materials in North East Kano State (Nigeria) through aerial photographs Nanda, R L; Akinyede, J 0 Proc Ninth Regional Conference for Africa on Soil Mechanics and Foundation Engineering, Lagos, September 1987 VI, P551-556. Publ Rotterdam: A A Balkema. 1987 Aerial photography has been used in a survey of road construction materials in an area where hard stone is not available. A preliminary field investigation was used to develop an interpretation key, by correlating topographic and physiographic features of the terrain with photographic features. Calcrete was the only locally available construction material and can easily be identified by aerial photographs. The interpretation technique was verified by ground sampling.
Structural and geotechnical mapping 901154 Fractal mapping of digitized images: application to the topography of Arizona and comparisons with synthetic images Huang, J; Turcotte, D L J Geoph.vs Res V96, NB6, June 1989, P7491-7495 The earth has complex and chaotic topography, the result of many competing processes, which can be treated using fractal statistics. The concept of fractal mapping is introduced. The digitised topography of Arizona is seen to satisfy fractal statistics to a good approximation. Fractal dimensions and roughness amplitudes for subregions are used to construct maps of these quantities for the entire state. It is shown that the fractal dimension of actual two dimensional topography is not directly related by adding unity to the fractal dimension of actual one dimensional topographic tracks.
901155 Engineering-geological evaluation of sites proposed for development in the dolomite karst regions of southern Africa Roux, P Proc 2nd Muitidisciplinary Conference on Sinkholes and the Environmental Impacts of Karst, Orlando, 9-11 February 1987 P331-336. Publ Rotterdam: A A Balkema. 1987 In Transvaal there are legal requirements for engineering geological assessment of karstic sites before development may be undertaken. Flowcharts are presented to serve as guidelines for evaluation of dewatered and non-dewatered sites. Investigation procedures and materials evaluation for the variety of geomaterials encountered are considered. Sites are placed into three categories of suitability for development. Precautionary drainage measures before development are discussed.
901156 Methods and importance of detailed mapping and data gathering in the geotechnical asse~ment of civil and mining projects Barker, O B Proc SANGORM Symposium on Rock Slope Stability, Indaba Sun, 10 March 1989 P18-21. Publ Marshalltown: SANGORM. 1989 Accurate data collection for rocks only briefly exposed is discussed. Under project planning, the idea of Quality Assurance is introduced. This is a method developed by the nuclear industry to reduce errors to a minimum. For in situ mapping, cleaning and marking surfaces should be considered. Scale is important and should be changed when more detail is required. Use of photography is outlined. 901157 Landslides risk mapping in Lorraine (In French) Perrot, A Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2, P1217-1222. Publ Rotterdam." A A Balkema, 1988 Lorraine is prone to landslides due to predominance of clay and marl and climatic factors, including high spring rainfall. Detailed studies of natural slopes have been carried out for 20 years and have led to development of a method to map landslide occurrence probability. This method combines factors such as lithology, natural ground slope and existence of old or recent slides. An attempt to classify intensity of existing slides is made, based on the depth of the sliding surface, displacement velocity and surface of the slide. By combining intensity and occurrence probability, 4 classes of risk for use in planning can be determined.
901158 Rock and debris-slides risk mapping in Nepal - a user-friendly PC system for risk mapping Wagner, A; Leite, E; Olivier, R Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2, P1251-1258. Publ Rotterdam." A A Balkema, 1988 Data have been collected from 400km of road corridors in Nepal. Analysis has been carried out taking into account risks of wedge or planar failure,including lithological, hydrogeological, tectonic and weathering influences. A limit angle of 35deg is indicated for non-rocky slopes (colluvium, alluvium, eluvium). There is correlation between presence of colluvium and structural risk of slope failure. A simple to use, PC based system to map risks of rock and debris slides is introduced, and its output illustrated using the collected data.
901159 Engineering geological map of Rivers State of Nigeria derived from conventional soil survey Madedor, A O; Nnama, S K; Aitsebaoma, F O Proc Ninth Regional Conference for Africa on Soil Mechanics and Foundation Engineering, Lagos, September 1987 VI, P521-528. Pubi Rotterdam: A A Balkema, 1987 A simple engineering geology map of Rivers State, Nigeria, to show the basic engineering properties of subgrades relevant to road engineers, has been constructed using results of a soil survey. In situ moisture content was determined at each site and a sample taken for laboratory testing to determine particle size distribution, liquid and plastic limits, compaction and California Bearing Ratio.
© 1990 Pergamon Press plc. Reproduction not permitted
901152 Aerial photographic mapping of granular materials for building and road construction in Ghana Kuma, D O K Proc Ninth Regional Conference for Africa on Soil Mechanics and Fomulation Engineering, Lagos, September 1987 VI, P545-550. Publ Rotterdam: A A Balkema, 1987 The applicability of photography for identification and location of granular materials, particularly laterites, in Ghana is discussed. The three types of granular material, transported superficial cover, residual superficial cover and quartzite gravels are described. The engineering geology and air photo characteristics of laterite crusts, laterite gravels and laterite residual fine grained soils are outlined.
901153 Survey of road construction materials in North East Kano State (Nigeria) through aerial photographs Nanda, R L; Akinyede, J 0 Proc Ninth Regional Conference for Africa on Soil Mechanics and Foundation Engineering, Lagos, September 1987 VI, P551-556. Publ Rotterdam: A A Balkema. 1987 Aerial photography has been used in a survey of road construction materials in an area where hard stone is not available. A preliminary field investigation was used to develop an interpretation key, by correlating topographic and physiographic features of the terrain with photographic features. Calcrete was the only locally available construction material and can easily be identified by aerial photographs. The interpretation technique was verified by ground sampling.
Structural and geotechnical mapping 901154 Fractal mapping of digitized images: application to the topography of Arizona and comparisons with synthetic images Huang, J; Turcotte, D L J Geoph.vs Res V96, NB6, June 1989, P7491-7495 The earth has complex and chaotic topography, the result of many competing processes, which can be treated using fractal statistics. The concept of fractal mapping is introduced. The digitised topography of Arizona is seen to satisfy fractal statistics to a good approximation. Fractal dimensions and roughness amplitudes for subregions are used to construct maps of these quantities for the entire state. It is shown that the fractal dimension of actual two dimensional topography is not directly related by adding unity to the fractal dimension of actual one dimensional topographic tracks.
901155 Engineering-geological evaluation of sites proposed for development in the dolomite karst regions of southern Africa Roux, P Proc 2nd Muitidisciplinary Conference on Sinkholes and the Environmental Impacts of Karst, Orlando, 9-11 February 1987 P331-336. Publ Rotterdam: A A Balkema. 1987 In Transvaal there are legal requirements for engineering geological assessment of karstic sites before development may be undertaken. Flowcharts are presented to serve as guidelines for evaluation of dewatered and non-dewatered sites. Investigation procedures and materials evaluation for the variety of geomaterials encountered are considered. Sites are placed into three categories of suitability for development. Precautionary drainage measures before development are discussed.
901156 Methods and importance of detailed mapping and data gathering in the geotechnical asse~ment of civil and mining projects Barker, O B Proc SANGORM Symposium on Rock Slope Stability, Indaba Sun, 10 March 1989 P18-21. Publ Marshalltown: SANGORM. 1989 Accurate data collection for rocks only briefly exposed is discussed. Under project planning, the idea of Quality Assurance is introduced. This is a method developed by the nuclear industry to reduce errors to a minimum. For in situ mapping, cleaning and marking surfaces should be considered. Scale is important and should be changed when more detail is required. Use of photography is outlined. 901157 Landslides risk mapping in Lorraine (In French) Perrot, A Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2, P1217-1222. Publ Rotterdam." A A Balkema, 1988 Lorraine is prone to landslides due to predominance of clay and marl and climatic factors, including high spring rainfall. Detailed studies of natural slopes have been carried out for 20 years and have led to development of a method to map landslide occurrence probability. This method combines factors such as lithology, natural ground slope and existence of old or recent slides. An attempt to classify intensity of existing slides is made, based on the depth of the sliding surface, displacement velocity and surface of the slide. By combining intensity and occurrence probability, 4 classes of risk for use in planning can be determined.
901158 Rock and debris-slides risk mapping in Nepal - a user-friendly PC system for risk mapping Wagner, A; Leite, E; Olivier, R Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2, P1251-1258. Publ Rotterdam." A A Balkema, 1988 Data have been collected from 400km of road corridors in Nepal. Analysis has been carried out taking into account risks of wedge or planar failure,including lithological, hydrogeological, tectonic and weathering influences. A limit angle of 35deg is indicated for non-rocky slopes (colluvium, alluvium, eluvium). There is correlation between presence of colluvium and structural risk of slope failure. A simple to use, PC based system to map risks of rock and debris slides is introduced, and its output illustrated using the collected data.
901159 Engineering geological map of Rivers State of Nigeria derived from conventional soil survey Madedor, A O; Nnama, S K; Aitsebaoma, F O Proc Ninth Regional Conference for Africa on Soil Mechanics and Foundation Engineering, Lagos, September 1987 VI, P521-528. Pubi Rotterdam: A A Balkema, 1987 A simple engineering geology map of Rivers State, Nigeria, to show the basic engineering properties of subgrades relevant to road engineers, has been constructed using results of a soil survey. In situ moisture content was determined at each site and a sample taken for laboratory testing to determine particle size distribution, liquid and plastic limits, compaction and California Bearing Ratio.
© 1990 Pergamon Press plc. Reproduction not permitted