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Seismic hazard at Tehri dam
319A 935399 Luser-alded tomography: a tool for visualization of changes in the fabric of granular assemblage Konagai, K; Tamura, C; Rangelow, P; Matsushima, T Struct Emgug Eart&! F,ngng V9, 3t3, Oct 1992, P25-33 A new experimental technique to allow dynamic behaviour of immersed particulate structures to be studied is presented. The structural model of crushed glass is immersed in a liquid with similar refractive index, rendering it invisible. An intense laser light 'sheet' is passed through the model, illuminating the particle boundaries in the cross section, and images are captured by high speed photography. Scanning the model with the light sheet allows 3D images to be built up. Examples are shown.
9354OO Seismic hazard at Tehri dam Brune, J N Tectonopkysics V218, N1/3, Feb 1993, P281-286 Proposed construction of the 265m high Tehri Dam in the Himalayas has revealed how little is known about prediction of ground motion in this unique tectonic setting. The site is in a major Himalayan seismic gap with possible earthquake magnitude °8. Indirect evidence suggests accelerations in excess of lg can be expected. Studies required to reduce uncertainty in the seismic hazard are outlined: source effects; propagation path effects; and site effects. Rigorous dynamic analysis of the dam design is essential.
935401 Landslides and associated ground failures in the epicentral region of the October 1989, Loma Prleta earthquake - factors affecting the distribution and nature of seismically induced landsliding Weber, G E; Nolan, J M Proc 28th Symposium on Engineering Geology and Geoteclmical Engineering, Boise, 1-3 April 1992 P361-377. Publ Pocatello: Idaho State University, 1992 Earthquake-induced ground cracking and landslides in the epicentral region of the 1989 Loma Prieta earthquake and 2 ages of older landslides were mapped. Sparse, small to medium translational slides were associated with the earthquake, little evidence being found for formation of deep seated slides as a result of Loma Prieta type events. Climatic events appear to be the main driving force behind slope evolution in the region. Geological features correlating with the location of earthquake-induced slides were identified.
935402 Bchaviour of model embankments on shaking table Telekes, G; Ogawa, S; Hirasawa, M Proc Ninth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Bangkok, 9-13 December 1991 V1, P347-350. Publ Thailand: Southeast Asian Geotechnical Society, 1991 Five different types of model embankment were subject to horizontal dynamic loading on a shaking table. 30 gal and 70 gal acceleration with variable frequency and constant 2Hz and 10Hz with variable acceleration were applied. Behaviour of the different models, including shape at failure, has been studied. The relative advantages of the different type, thickness, or layout of the reinforcement used in 4 of the 5 model types are discussed. Suggestions are made for further work.
935403 Selection of ground motions for the seismic evaluation of embankments Green, R K Proc Conference Stability and Performance of Slopes and Embawdcments !I, Berkeley, 29 Jane-I July 1992 VI, P593608. Pubi New York: ASCE, 1992 (ASCE Special Geotechnical Publication No 31) Care must be taken in selection of the design earthquake for embankments. Parameters which can be used to characterise the ground motion include peak values of acceleration, velocity, and displacement, response spectra,duration, and accelerograms. These parameters are usually estimated on the basis of Maximum Credible Earthquake magnitude, source-site distanee, and empirical relations. The two most important ground motion parameters affecting embankments are duration and response spectrum. Accelerograms used for evaluation of embankment response should be consistent with these parameters. 935404 Response of earth dams subjected to earthquake fault rupture Bray, J D; Seed, R B; Seed, H B Proc Conference Stability and Performance of Slopes and Embankments !I, Berkeley, 29 Jane-I July 1992 VI, P608624. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Publication No 31) A comprehensive study has been made of the dynamic response of earth dams. Earth dam/fault rupture case histories, previous attempts to design dams across potentially active faults, earthquake surface fault ruptures, and physical and numerical modelling were included. Results indicate that height of the shear rupture zone in the clay core of an earth dam overlying the displaced base rock fault at a specified fault offset is determined principally by the failure strain of the soil. A ductile core soil, compacted so as to increase lateral earth pressure, is suggested. 935405 Seismic retrofit analysis of a homogeneous earthfill dam Somasundaram, S; Khilnani, K S; Martin, G R Proc Conference Stability and Performance of Slopes and Embankments 11, Berkeley, 29 Jane-I July 1992 V1, P669684. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Publication No 31) The Dos Pueblos dam is a small, privately owned carthfill dam, with a narrow channel containing potentially liquefiable sandy alluvium under part of the embankment. A simple, economic, and conservative seismic stability analysis has been carried out. Induced stresses under maximum credible earthquake load were determined. Undisturbed samples of the alluvium were subject to simulated earthquake loading. Results indicate residual shear strength is sufficient to prevent flowtype failure, although some crest deformation will occur. Design water level has been lowered to ensure safety.
Underground Excavations 9354O6 Petroleum Related Rock Mechanics Fjaer, E; Holt, R M; Horsrud, P; Raaen, A M; Risnes, R Amsterdam: Elsevier, 1992, 338P This volume fills a gap which has long existed in Petroleum Technology literature, being primarily concerned with application of rock mechanics, as opposed to rock physics, to the
© 1993 Pergamon Press Ltd, Reproduction not permitted
9354OO Seismic hazard at Tehri dam Brune, J N Tectonopkysics V218, N1/3, Feb 1993, P281-286 Proposed construction of the 265m high Tehri Dam in the Himalayas has revealed how little is known about prediction of ground motion in this unique tectonic setting. The site is in a major Himalayan seismic gap with possible earthquake magnitude °8. Indirect evidence suggests accelerations in excess of lg can be expected. Studies required to reduce uncertainty in the seismic hazard are outlined: source effects; propagation path effects; and site effects. Rigorous dynamic analysis of the dam design is essential.
935401 Landslides and associated ground failures in the epicentral region of the October 1989, Loma Prleta earthquake - factors affecting the distribution and nature of seismically induced landsliding Weber, G E; Nolan, J M Proc 28th Symposium on Engineering Geology and Geoteclmical Engineering, Boise, 1-3 April 1992 P361-377. Publ Pocatello: Idaho State University, 1992 Earthquake-induced ground cracking and landslides in the epicentral region of the 1989 Loma Prieta earthquake and 2 ages of older landslides were mapped. Sparse, small to medium translational slides were associated with the earthquake, little evidence being found for formation of deep seated slides as a result of Loma Prieta type events. Climatic events appear to be the main driving force behind slope evolution in the region. Geological features correlating with the location of earthquake-induced slides were identified.
935402 Bchaviour of model embankments on shaking table Telekes, G; Ogawa, S; Hirasawa, M Proc Ninth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Bangkok, 9-13 December 1991 V1, P347-350. Publ Thailand: Southeast Asian Geotechnical Society, 1991 Five different types of model embankment were subject to horizontal dynamic loading on a shaking table. 30 gal and 70 gal acceleration with variable frequency and constant 2Hz and 10Hz with variable acceleration were applied. Behaviour of the different models, including shape at failure, has been studied. The relative advantages of the different type, thickness, or layout of the reinforcement used in 4 of the 5 model types are discussed. Suggestions are made for further work.
935403 Selection of ground motions for the seismic evaluation of embankments Green, R K Proc Conference Stability and Performance of Slopes and Embawdcments !I, Berkeley, 29 Jane-I July 1992 VI, P593608. Pubi New York: ASCE, 1992 (ASCE Special Geotechnical Publication No 31) Care must be taken in selection of the design earthquake for embankments. Parameters which can be used to characterise the ground motion include peak values of acceleration, velocity, and displacement, response spectra,duration, and accelerograms. These parameters are usually estimated on the basis of Maximum Credible Earthquake magnitude, source-site distanee, and empirical relations. The two most important ground motion parameters affecting embankments are duration and response spectrum. Accelerograms used for evaluation of embankment response should be consistent with these parameters. 935404 Response of earth dams subjected to earthquake fault rupture Bray, J D; Seed, R B; Seed, H B Proc Conference Stability and Performance of Slopes and Embankments !I, Berkeley, 29 Jane-I July 1992 VI, P608624. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Publication No 31) A comprehensive study has been made of the dynamic response of earth dams. Earth dam/fault rupture case histories, previous attempts to design dams across potentially active faults, earthquake surface fault ruptures, and physical and numerical modelling were included. Results indicate that height of the shear rupture zone in the clay core of an earth dam overlying the displaced base rock fault at a specified fault offset is determined principally by the failure strain of the soil. A ductile core soil, compacted so as to increase lateral earth pressure, is suggested. 935405 Seismic retrofit analysis of a homogeneous earthfill dam Somasundaram, S; Khilnani, K S; Martin, G R Proc Conference Stability and Performance of Slopes and Embankments 11, Berkeley, 29 Jane-I July 1992 V1, P669684. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Publication No 31) The Dos Pueblos dam is a small, privately owned carthfill dam, with a narrow channel containing potentially liquefiable sandy alluvium under part of the embankment. A simple, economic, and conservative seismic stability analysis has been carried out. Induced stresses under maximum credible earthquake load were determined. Undisturbed samples of the alluvium were subject to simulated earthquake loading. Results indicate residual shear strength is sufficient to prevent flowtype failure, although some crest deformation will occur. Design water level has been lowered to ensure safety.
Underground Excavations 9354O6 Petroleum Related Rock Mechanics Fjaer, E; Holt, R M; Horsrud, P; Raaen, A M; Risnes, R Amsterdam: Elsevier, 1992, 338P This volume fills a gap which has long existed in Petroleum Technology literature, being primarily concerned with application of rock mechanics, as opposed to rock physics, to the
© 1993 Pergamon Press Ltd, Reproduction not permitted