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A preliminary design approach for Guledar irrigation dam project
SITE INVESTIGATIONS:MAPPING 966177 A ground follow-up study of aeroradiometric anomalies in Ikom, south-east Nigeria E. J. Uwah, Nuclear Geophysics, 9(4), 1995, pp 357-361. eU, eTh and K concentrations in some rock samples from delineated radiometric anomalies in Ikom, southeast Nigeria measured by comparing the intensities of the 0.092 have MeV been y-ray of 234Th,the 0.911 MeV y-ray of 22SAc and the 1.46 MeV -/-ray of 4°K in the rock samples with tested reference materials. The use of the medium energy y-ray of 234Th of the U group in the 238Useries to measure U was based on the disequilibrium in the U series in ores from the area being investigated. A semi-qualitative method of interpretation adopted in this work enabled a fast, preliminary conclusion to be drawn regarding the likely absence of U mineralization in the area covered. (Author)
966178 A simple technique to identify magnetic anomalies due to kimberlite pipes P. Keating, Exploration & Mining Geology, 4(2), 1995, pp 121-125. Most of the world's known kimberlites have distinctive geophysical signatures, generally magnetic and/or electromagnetic. In the Canadian Shield, their aeromagnetic signature is often that of a circular anomaly. Target selection from aeromagnetic data is therefore based on the identification of roughly circular anomalies. This procedure can be automated by using known pattern recognition techniques. The locations of the solutions are plotted on the aeromagnetic map and, if available, on a conductivity map. The Kirkland Lake region was selected to test the methodology and the proposed technique has been able to identify known kimberlites. (from Author)
Structural and geotechnical mapping 966179 Analyzing shallow faulting at a site in the Wasatch fault zone, Utah, USA, by integrating seismic, gravity, magnetic, and trench data A. K. Benson & N. B. Mustoe, Engineering Geology, 40(3-4), 1995, pp 139-156. In addition to verifying locations of known faults, the geophysical surveys detected numerous possible additional faults not previously mapped. Of particular interest is a newly discovered graben structure near the southern end of the site, where building of new homes has recently been proposed. New structural information about fault densities and styles was also determined from the surveys. The fault concentration for this site is 1.3 faults/100 ft (30.5 m), or one fault per 77 ft (23.5 m). Interpreted antithetic faults at the Hobble Creek site account for 65% of the total, while synthetic faults account for 35% with respect to the main fault strand. (from Authors) 966180 Engineering-geological mapping of tropical soils for landuse planning and geotechnicni purposes: a case study from Jamaica, West Indies R. J. Maharaj, Engineering Geology, 40(3-4), 1995, pp 243286. An area of Tertiary and Cretaceous deposits, 100-310 m above sea level and on predominant 20-45 ° , highly dissected, concave slopes was investigated. Lithologies include turbidites, fluvial conglomerates, breccias, sandstones, mudrocks, carbonates, granodiorite, acid dykes, chloritized and epidotized voicanics, andesite and Holoeene fluvial deposits. Bedrock is highly fractured and sheared, hydrothermally altered and highly weathered. Soils are quite variable, with a strong geological control on soil properties. Based on the characteristics of the terrain, the geotechnicai and land use
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planning problems include high landslide frequency and susceptibility, soil erosion, fluvial and reservoir sedimentation, high debris flow hazard, cut slope failures, potentially expansive clays and silts, seepage erosion and soil piping, differential settlement in interlayered competent and incompetent lithologies, high solution erosion and potential subsidence over limestones, waste water disposal problems and groundwater pollution and seismic induced settlement and ground failures. (from Author)
966181 A preliminary design approach for Guledar irrigation dam project A. Ozsan & C. Karpuz, Bulletin - International Association of Engineering Geology, 52, 1995, pp 95-102. This paper describes the results of engineering geological and rock mechanics studies carried out at the project. The dam site is located within Guledar Sirkeli formations composed of sandstone, limestone and diabase. Field studies included geological mapping, core drilling, sampling for laboratory testing, pressured water tests, and intensive discontinuity surveying. Some physical and mechanical properties were determined in the laboratory. The rock mass qualities were described as poor to fair quality. The corresponding Hock and Brown failure envelopes have been drawn and failure equations have been suggested for stability analysis of dam foundation, slope stability and diversion tunnels for each rock unit. (from Authors)
966182 Proposal for methodology to be applied to road construction in the karstified carbonate and clastic (flysch) terrains in southern Croatia S. Sestanovic, C. Roda & M. Andric, Rudarsko Geolosko Naftni Zbornik, 7, 1995, pp 29-36. The paper presents an efficient methodology applied to investigation works planned according to types of structures and phases of the road planning. The preliminary design phase should include all planning investigation works in order to solve the number of problems relevant to the final design phase and to the conditions and possibilities of road construction. The paper also stresses the necessity of precisely defining the lithostratigraphical and tectonic features as a prerequisite for planning the scope and quantity of investigation works and for proper interpretation of all engineeringgeological and hydrogeological relations. (from Authors)
966183 Quantification, identification et proprietes physiques des sediments de ia retenue du barrage Sidi Saad (Centre de la Tunisie) (Quantification, identification and physical properties of sediments from the reservoir of Sidi Saad dam, central Tunisia) A. Ben Mammou, Bulletin - International Association of Engineering Geology, 52, 1995, pp 39-52. Silting of impounded Sidi Saad lake seriously threatens the reservoir. The total watershed is practically devoid of vegetal cover. The gamma-density curves of sediment cores reveal the presence of several deposit sequences. The latter are attributed to the turbidity sequences of Bouma type with a predominance of a, b, d and e divisions. However, the superficial sampling shows a granular sorting from the alluvial fans to the dam. This sorting is confirmed by a geotechnical study. The mineralogical composition shows a detritie origin from the erodible formation in the watershed. Consolidation tests show five stages of deposition. The consolidation speed depends on the initial charge of the mixture and on the drainage conditions. The increase of the sediments cohesion along the time flow follows an exponential law. (from Enlgish summary)
966178 A simple technique to identify magnetic anomalies due to kimberlite pipes P. Keating, Exploration & Mining Geology, 4(2), 1995, pp 121-125. Most of the world's known kimberlites have distinctive geophysical signatures, generally magnetic and/or electromagnetic. In the Canadian Shield, their aeromagnetic signature is often that of a circular anomaly. Target selection from aeromagnetic data is therefore based on the identification of roughly circular anomalies. This procedure can be automated by using known pattern recognition techniques. The locations of the solutions are plotted on the aeromagnetic map and, if available, on a conductivity map. The Kirkland Lake region was selected to test the methodology and the proposed technique has been able to identify known kimberlites. (from Author)
Structural and geotechnical mapping 966179 Analyzing shallow faulting at a site in the Wasatch fault zone, Utah, USA, by integrating seismic, gravity, magnetic, and trench data A. K. Benson & N. B. Mustoe, Engineering Geology, 40(3-4), 1995, pp 139-156. In addition to verifying locations of known faults, the geophysical surveys detected numerous possible additional faults not previously mapped. Of particular interest is a newly discovered graben structure near the southern end of the site, where building of new homes has recently been proposed. New structural information about fault densities and styles was also determined from the surveys. The fault concentration for this site is 1.3 faults/100 ft (30.5 m), or one fault per 77 ft (23.5 m). Interpreted antithetic faults at the Hobble Creek site account for 65% of the total, while synthetic faults account for 35% with respect to the main fault strand. (from Authors) 966180 Engineering-geological mapping of tropical soils for landuse planning and geotechnicni purposes: a case study from Jamaica, West Indies R. J. Maharaj, Engineering Geology, 40(3-4), 1995, pp 243286. An area of Tertiary and Cretaceous deposits, 100-310 m above sea level and on predominant 20-45 ° , highly dissected, concave slopes was investigated. Lithologies include turbidites, fluvial conglomerates, breccias, sandstones, mudrocks, carbonates, granodiorite, acid dykes, chloritized and epidotized voicanics, andesite and Holoeene fluvial deposits. Bedrock is highly fractured and sheared, hydrothermally altered and highly weathered. Soils are quite variable, with a strong geological control on soil properties. Based on the characteristics of the terrain, the geotechnicai and land use
263A
planning problems include high landslide frequency and susceptibility, soil erosion, fluvial and reservoir sedimentation, high debris flow hazard, cut slope failures, potentially expansive clays and silts, seepage erosion and soil piping, differential settlement in interlayered competent and incompetent lithologies, high solution erosion and potential subsidence over limestones, waste water disposal problems and groundwater pollution and seismic induced settlement and ground failures. (from Author)
966181 A preliminary design approach for Guledar irrigation dam project A. Ozsan & C. Karpuz, Bulletin - International Association of Engineering Geology, 52, 1995, pp 95-102. This paper describes the results of engineering geological and rock mechanics studies carried out at the project. The dam site is located within Guledar Sirkeli formations composed of sandstone, limestone and diabase. Field studies included geological mapping, core drilling, sampling for laboratory testing, pressured water tests, and intensive discontinuity surveying. Some physical and mechanical properties were determined in the laboratory. The rock mass qualities were described as poor to fair quality. The corresponding Hock and Brown failure envelopes have been drawn and failure equations have been suggested for stability analysis of dam foundation, slope stability and diversion tunnels for each rock unit. (from Authors)
966182 Proposal for methodology to be applied to road construction in the karstified carbonate and clastic (flysch) terrains in southern Croatia S. Sestanovic, C. Roda & M. Andric, Rudarsko Geolosko Naftni Zbornik, 7, 1995, pp 29-36. The paper presents an efficient methodology applied to investigation works planned according to types of structures and phases of the road planning. The preliminary design phase should include all planning investigation works in order to solve the number of problems relevant to the final design phase and to the conditions and possibilities of road construction. The paper also stresses the necessity of precisely defining the lithostratigraphical and tectonic features as a prerequisite for planning the scope and quantity of investigation works and for proper interpretation of all engineeringgeological and hydrogeological relations. (from Authors)
966183 Quantification, identification et proprietes physiques des sediments de ia retenue du barrage Sidi Saad (Centre de la Tunisie) (Quantification, identification and physical properties of sediments from the reservoir of Sidi Saad dam, central Tunisia) A. Ben Mammou, Bulletin - International Association of Engineering Geology, 52, 1995, pp 39-52. Silting of impounded Sidi Saad lake seriously threatens the reservoir. The total watershed is practically devoid of vegetal cover. The gamma-density curves of sediment cores reveal the presence of several deposit sequences. The latter are attributed to the turbidity sequences of Bouma type with a predominance of a, b, d and e divisions. However, the superficial sampling shows a granular sorting from the alluvial fans to the dam. This sorting is confirmed by a geotechnical study. The mineralogical composition shows a detritie origin from the erodible formation in the watershed. Consolidation tests show five stages of deposition. The consolidation speed depends on the initial charge of the mixture and on the drainage conditions. The increase of the sediments cohesion along the time flow follows an exponential law. (from Enlgish summary)