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Stress-strain state of a slope during its construction
382A slope. A similar approach is used to evaluate piping failure probability. The slope stability analysis considers failure domains for critical sections, from which a total probability of failure due to slope instability can be determined. 916403 Drain-curtain steady-state seepage effect in permeable foundation of a concrete dam Kaikani, E C Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V2, Pl185-1191. Publ Rotterdam: A A Balkema, 1990
the deposit, together with oedometer, field and laboratory vane shear, SPTs, and conventional triaxial tests. Results are compared to those from tests on another well documented clay deposit in the area. Total stress back analysis was used to obtain cohesion and shear strength parameters, which were compared to those from the field and laboratory tests. 916407 Risk evaluation of rock mass sliding in EI-Deir EI-Bahary valley, Luxor, Egypt Abdallah, T; Helai, H Int Assoc Engng Geol Bull N42, Oct 1990, P3-9
Steady state seepage for a dam foundation is analysed using the finite difference method. The 20m high concrete structure is built on 32m deep permeable foundations which include an l l m deep grout curtain. The effect of a 10m deep drainage curtain on flow and hydraulic pressure in the foundations is assessed. An effective drainage curtain increases the seepage flow: if it is ineffective, uplift pressure at the base of the dam increases.
Two rockfalls have recently occurred in the Gehel Gurnah rock mass, composed of Esna shale overlain by highly fractured Thebes limestone. In order to evaluate potential danger to a temple, the probability of further rockfalls has been examined by finite element analysis with the SLOPPROB code. A circular failure model based on the behaviour of intact rock modified using the Bieniawski (CSIR) classification to account for discontinuities and weathering is employed.
Hydraulic structures
916408 Effect of water-content variability in design of clay embankments Agrawal, G; Altschaeffl, A G J Geotecli Engng Div ASCE V117, N4, April 1991, P673-683
916404 Conception of a base of oceanographical data (In French) Thomas, P lnt Assoc Engng Geol Bull N42, Oct 1990, P101-105 The continental shelf has diverse morphology, which is important to navigation. The effect of engineering works in a harbour on evolution of marine morphology has been studied in the Loire estuary, France. Erosion, sedimentation, and stable zones were mapped. Oceanic, fluvial, and engineering influences were analysed. Application of these results to similar conditions elsewhere is discussed. 916405 Rook quality in coastal engineering Poole, A B Q J Engng Geol V24, N1, 1991, P85-90. (paper to the conference on Geological Materials in Construction, London, November 1989) Coastal defence structures are subject to harsh marine environments. An outline of the use of rock in such works is presented. Quality assurance schemes for marine structures must be devised at early stages in the project. Tests must examine size and shape, intact rock strength and resistance to abrasion, intrinsic rock properties such as density, and weathering and degradation. A suitable series of tests to enable prediction of performance of rocks in coastal engineering is presented.
Earth structures must accommodate the variability that is inevitable for field compacted soils. The effect of water content variability on slope stability is examined for a hypothetical embankment constructed using a soil for which a large database of parameters is available. It is demonstrated that range of water content at the time of compaction is the most important characteristic in design. The wider the range of water content, the less steep a slope can be for a given factor of safety. Careful control of water content offers cost saving potential. 916409 Method for predicting slope failure Michiue, M; Fujita, M Natural Disaster Sci 1/12, N1, 1990, P49-62 A method for prediction of slope failure based on seepage and stability analyses is presented. Both lateral and vertical unsaturated flow are considered, together with vertical flow in the saturated zone. A stability analysis of a slope of infinite length is used to establish the threshold conditions for slope failure. When lateral unsaturated flow is included, predicted and experimental phreatic surfaces in the slope are in good agreement. When applied to field prediction of slope failure, a coefficient of permeability 10x that measured on cores is used, to account for large pores missed by core sampling. This improves accuracy of prediction.
Slopes See also: 916033, 916068, 916354, 916355, 916356, 916491 916406 Analysis of u sanitary-embankment failure over the Rio de Janeiro soft clay deposit Cunha, R P; Lacerda, W A Can Geotech J V28, N1, Feb 1991, P92-102 Failure of an embankment of dumped sanitary fill and rubble on unconsolidated soft Caju clay foundations is described. Index tests were carried out to obtain a geotechnical profile of
916410 Stress-strain state of a slope during its construction Sorochan, E A; Puzrin, A M Soil Mech Found Engng V27, N4, July-Aug 1990, P151-154 Finite element analysis is presented of a soil slope on which a pile wall retaining structure has been built to below the computed slip surface, then three structural strip foundations constructed and loaded. Overall stability is established, and stress strain state during the various stages, creep pressure on the wall, and displacements of the wall and footings can be computed.
© 1991 Pergamon Press plc. Reproduction not permitted
the deposit, together with oedometer, field and laboratory vane shear, SPTs, and conventional triaxial tests. Results are compared to those from tests on another well documented clay deposit in the area. Total stress back analysis was used to obtain cohesion and shear strength parameters, which were compared to those from the field and laboratory tests. 916407 Risk evaluation of rock mass sliding in EI-Deir EI-Bahary valley, Luxor, Egypt Abdallah, T; Helai, H Int Assoc Engng Geol Bull N42, Oct 1990, P3-9
Steady state seepage for a dam foundation is analysed using the finite difference method. The 20m high concrete structure is built on 32m deep permeable foundations which include an l l m deep grout curtain. The effect of a 10m deep drainage curtain on flow and hydraulic pressure in the foundations is assessed. An effective drainage curtain increases the seepage flow: if it is ineffective, uplift pressure at the base of the dam increases.
Two rockfalls have recently occurred in the Gehel Gurnah rock mass, composed of Esna shale overlain by highly fractured Thebes limestone. In order to evaluate potential danger to a temple, the probability of further rockfalls has been examined by finite element analysis with the SLOPPROB code. A circular failure model based on the behaviour of intact rock modified using the Bieniawski (CSIR) classification to account for discontinuities and weathering is employed.
Hydraulic structures
916408 Effect of water-content variability in design of clay embankments Agrawal, G; Altschaeffl, A G J Geotecli Engng Div ASCE V117, N4, April 1991, P673-683
916404 Conception of a base of oceanographical data (In French) Thomas, P lnt Assoc Engng Geol Bull N42, Oct 1990, P101-105 The continental shelf has diverse morphology, which is important to navigation. The effect of engineering works in a harbour on evolution of marine morphology has been studied in the Loire estuary, France. Erosion, sedimentation, and stable zones were mapped. Oceanic, fluvial, and engineering influences were analysed. Application of these results to similar conditions elsewhere is discussed. 916405 Rook quality in coastal engineering Poole, A B Q J Engng Geol V24, N1, 1991, P85-90. (paper to the conference on Geological Materials in Construction, London, November 1989) Coastal defence structures are subject to harsh marine environments. An outline of the use of rock in such works is presented. Quality assurance schemes for marine structures must be devised at early stages in the project. Tests must examine size and shape, intact rock strength and resistance to abrasion, intrinsic rock properties such as density, and weathering and degradation. A suitable series of tests to enable prediction of performance of rocks in coastal engineering is presented.
Earth structures must accommodate the variability that is inevitable for field compacted soils. The effect of water content variability on slope stability is examined for a hypothetical embankment constructed using a soil for which a large database of parameters is available. It is demonstrated that range of water content at the time of compaction is the most important characteristic in design. The wider the range of water content, the less steep a slope can be for a given factor of safety. Careful control of water content offers cost saving potential. 916409 Method for predicting slope failure Michiue, M; Fujita, M Natural Disaster Sci 1/12, N1, 1990, P49-62 A method for prediction of slope failure based on seepage and stability analyses is presented. Both lateral and vertical unsaturated flow are considered, together with vertical flow in the saturated zone. A stability analysis of a slope of infinite length is used to establish the threshold conditions for slope failure. When lateral unsaturated flow is included, predicted and experimental phreatic surfaces in the slope are in good agreement. When applied to field prediction of slope failure, a coefficient of permeability 10x that measured on cores is used, to account for large pores missed by core sampling. This improves accuracy of prediction.
Slopes See also: 916033, 916068, 916354, 916355, 916356, 916491 916406 Analysis of u sanitary-embankment failure over the Rio de Janeiro soft clay deposit Cunha, R P; Lacerda, W A Can Geotech J V28, N1, Feb 1991, P92-102 Failure of an embankment of dumped sanitary fill and rubble on unconsolidated soft Caju clay foundations is described. Index tests were carried out to obtain a geotechnical profile of
916410 Stress-strain state of a slope during its construction Sorochan, E A; Puzrin, A M Soil Mech Found Engng V27, N4, July-Aug 1990, P151-154 Finite element analysis is presented of a soil slope on which a pile wall retaining structure has been built to below the computed slip surface, then three structural strip foundations constructed and loaded. Overall stability is established, and stress strain state during the various stages, creep pressure on the wall, and displacements of the wall and footings can be computed.
© 1991 Pergamon Press plc. Reproduction not permitted