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Typology of natural slope instabilities in an operational context
136A
SURFACE STRUCTURES:SLOPES
fluvio-glacial channel running diagonally across the site. The site is further complicated by areas of cut and fill operations. The design of the piles was based entirely on penetration into either the glacial clays or Mercia Mudstones. (from Author) 963299
Potential construction problems for bridge foundations in areas underlain by a complex marble formation in Hong Kong T. Y. Irfan, in: Engineering geology of construction, ed M. Eddleston & others, (Geological Society of London; Engineering Geology Special Publication, IO), 1995, pp 127-134. Complex and varied geological conditions were encountered during the site investigation for a number of bridge foundations along the proposed route of a new trunk road. Special care is needed in the construction of the deep foundations for these bridges, particularly in areas underlain by a marble formation which has a varied karstic surface underneath a thick superficial cover and locally contains solution features, including large cavities. Foundation conditions are further complicated by varying lithology, weathering, dyke intrusions and the related alterations and thrust faulting. (Author)
Dams and embankments 963300
Seepage design charts for flat bottom dams resting on heterogeneous media W. A. Naouss 8c Y. M. Najjar, International Journal for Numerical & Analytical Methods in Geomechanics, 19(9), 1995, pp 637-651. The results of flow estimates were compiled and plotted to form different sets of design charts. These design charts can be used to estimate the seepage quantity and exist gradient in heterogeneous media under flat bottom dams. A numerical model, using the finite difference technique, was developed to solve for piezometric head and seepage velocity at all nodal locations within the permeable strata. The paper contains a description of the procedure adopted to calculate seepage quantity and exist gradient from the numerical results. (from Authors) 963301 Three-dimensional joint elements applied to concrete-faced dams J. L. Lusto, F. Segovia & A. Jaramillo, International Journal for Numerical & Analytical Methodr in Geomechanics, 19(9), 1995, pp 615-636. In the study of concrete-face dams it is essential to provide joint elements; otherwise the calculated stresses at the facing will be non-allowable. Three-dimensional joint elements must be simple to as not to increase in excess the CPU time. Seven non-incremental joint elements have been formulated or developed, and their relative advantages discussed. It is shown that quasi-linear or linear joint elements at the perimeter of the solid elements can have calculation advantages, specially for interfaces with ‘no tension’ resistance. (from Authors) 963302
The effect of insulating layer on arch dams located in cold area (in Chinese) Li Yisheng, Zhu Bofang & Lin Lejia, Shuili XuebaolJoumal of Hydraulic Engineering, 7, 1995, pp 54-58. In this paper a polystyrene plate is proposed as an insulating layer for the downstream face of arch dam to reduce temperature stress and dam thickness. The method for calculating the effect of this insulating layer is given. (English summary)
963303
Case history of a piled embankment in London’s Docklands G. B. Card 8c G. R. Carter, in: Engineering geology of construction, ed M. Eddleston & others, (Geological Society of London; Engineering Geology Special Publication, IO), 1995, pp 79-84. Innovative geotechnical solutions were required to overcome the difficult logistics of construction phasing the poor ground conditions at the Royal Albert Dock Spine Road. The ground conditions comprised up to 7 m of variable fill overlying soft compressible alluvium. To control settlement, a piled raft solution was designed to support the road embankment on either side of the conventionally piled Docklands Light Railway trough. The raft, comprising a granular mattress reinforced with layers of geogrid, was designed to transfer about 85% of the embankment loading onto the pile caps. This novel load transfer platform to the piled embankment produced a stable and economical foundation solution on poor ground while enabling a fast overall construction programme of 12 months to be achieved. (from Authors) 963304 The effect of canyon topography on strong ground motion at Feitsui damsite: quantitative results Huey-Chu Huang & Hung-Chie Chiu, Earthquake Engineering % Structural Dynamics, 24(7), 1995, pp 977-990. Observations suggest that the amplitude of ground motion at the trough of the canyon is smaller than that on its slopes. The integral equations method is applied to a two-dimensional model of Feitsui Canyon to study the effms of the canyon topography. The simulated and observed seismograms agree well in displacement and velocity, although the simulated acceleration at high frequency is underestimated. (from Authors) 963305 New apparatus for the dispersal hydraulicking of earth structures N. N. Kozhevnikov & B. M. Shkundin, Hydrotechnical Construction, 28(9), 1995, pp 507-510; translated from: Gidrotekhnicheskoe Stroitel’stvo, (9), 1994, pp 14-16. Hydraulic excavation is used extensively for the creation of dykes with one or two sided open beach slopes by the free spread of soil without the construction of levees. The authors describe a new system for a hydraulic slurry line intended for soil dispersal to create roads and dykes on swampy beds, and narrow dykes in bodies of water. The system will also be used for the construction of dykes with a beachside dynamically wave-resistant slope. (C.Paice)
Slopes 963306
Typologie des mouvements de versants dans un contexte operationnel (Typology of natural slope instabilities in an operational context) P. Antoine t A. Giraud, Bulletin - International Association of Engineering Geology, 51, 1995, pp 57-62. The purpose of this paper is to present a simplitied classification of geological formations, based on that presented in 1991 at the Nainville-les-Roches colloquium, specially adapted to the problems of natural slope instabilities. These geological data, taken in conjunction with other simple additional observations, will enable the person to determine the type of movement involved. (from English summary> 963307
Slope stability analysis: a kinematical approach R. L. Michalowski, Geotechnique, 45(2), 1995, pp 283-293. A stability analysis of slopes based on a translational mechanism of failure. is presented. The collapse mechanism is assumed to be in the form of rigid blocks analogous to
SURFACE STRUCTURES:SLOPES
fluvio-glacial channel running diagonally across the site. The site is further complicated by areas of cut and fill operations. The design of the piles was based entirely on penetration into either the glacial clays or Mercia Mudstones. (from Author) 963299
Potential construction problems for bridge foundations in areas underlain by a complex marble formation in Hong Kong T. Y. Irfan, in: Engineering geology of construction, ed M. Eddleston & others, (Geological Society of London; Engineering Geology Special Publication, IO), 1995, pp 127-134. Complex and varied geological conditions were encountered during the site investigation for a number of bridge foundations along the proposed route of a new trunk road. Special care is needed in the construction of the deep foundations for these bridges, particularly in areas underlain by a marble formation which has a varied karstic surface underneath a thick superficial cover and locally contains solution features, including large cavities. Foundation conditions are further complicated by varying lithology, weathering, dyke intrusions and the related alterations and thrust faulting. (Author)
Dams and embankments 963300
Seepage design charts for flat bottom dams resting on heterogeneous media W. A. Naouss 8c Y. M. Najjar, International Journal for Numerical & Analytical Methods in Geomechanics, 19(9), 1995, pp 637-651. The results of flow estimates were compiled and plotted to form different sets of design charts. These design charts can be used to estimate the seepage quantity and exist gradient in heterogeneous media under flat bottom dams. A numerical model, using the finite difference technique, was developed to solve for piezometric head and seepage velocity at all nodal locations within the permeable strata. The paper contains a description of the procedure adopted to calculate seepage quantity and exist gradient from the numerical results. (from Authors) 963301 Three-dimensional joint elements applied to concrete-faced dams J. L. Lusto, F. Segovia & A. Jaramillo, International Journal for Numerical & Analytical Methodr in Geomechanics, 19(9), 1995, pp 615-636. In the study of concrete-face dams it is essential to provide joint elements; otherwise the calculated stresses at the facing will be non-allowable. Three-dimensional joint elements must be simple to as not to increase in excess the CPU time. Seven non-incremental joint elements have been formulated or developed, and their relative advantages discussed. It is shown that quasi-linear or linear joint elements at the perimeter of the solid elements can have calculation advantages, specially for interfaces with ‘no tension’ resistance. (from Authors) 963302
The effect of insulating layer on arch dams located in cold area (in Chinese) Li Yisheng, Zhu Bofang & Lin Lejia, Shuili XuebaolJoumal of Hydraulic Engineering, 7, 1995, pp 54-58. In this paper a polystyrene plate is proposed as an insulating layer for the downstream face of arch dam to reduce temperature stress and dam thickness. The method for calculating the effect of this insulating layer is given. (English summary)
963303
Case history of a piled embankment in London’s Docklands G. B. Card 8c G. R. Carter, in: Engineering geology of construction, ed M. Eddleston & others, (Geological Society of London; Engineering Geology Special Publication, IO), 1995, pp 79-84. Innovative geotechnical solutions were required to overcome the difficult logistics of construction phasing the poor ground conditions at the Royal Albert Dock Spine Road. The ground conditions comprised up to 7 m of variable fill overlying soft compressible alluvium. To control settlement, a piled raft solution was designed to support the road embankment on either side of the conventionally piled Docklands Light Railway trough. The raft, comprising a granular mattress reinforced with layers of geogrid, was designed to transfer about 85% of the embankment loading onto the pile caps. This novel load transfer platform to the piled embankment produced a stable and economical foundation solution on poor ground while enabling a fast overall construction programme of 12 months to be achieved. (from Authors) 963304 The effect of canyon topography on strong ground motion at Feitsui damsite: quantitative results Huey-Chu Huang & Hung-Chie Chiu, Earthquake Engineering % Structural Dynamics, 24(7), 1995, pp 977-990. Observations suggest that the amplitude of ground motion at the trough of the canyon is smaller than that on its slopes. The integral equations method is applied to a two-dimensional model of Feitsui Canyon to study the effms of the canyon topography. The simulated and observed seismograms agree well in displacement and velocity, although the simulated acceleration at high frequency is underestimated. (from Authors) 963305 New apparatus for the dispersal hydraulicking of earth structures N. N. Kozhevnikov & B. M. Shkundin, Hydrotechnical Construction, 28(9), 1995, pp 507-510; translated from: Gidrotekhnicheskoe Stroitel’stvo, (9), 1994, pp 14-16. Hydraulic excavation is used extensively for the creation of dykes with one or two sided open beach slopes by the free spread of soil without the construction of levees. The authors describe a new system for a hydraulic slurry line intended for soil dispersal to create roads and dykes on swampy beds, and narrow dykes in bodies of water. The system will also be used for the construction of dykes with a beachside dynamically wave-resistant slope. (C.Paice)
Slopes 963306
Typologie des mouvements de versants dans un contexte operationnel (Typology of natural slope instabilities in an operational context) P. Antoine t A. Giraud, Bulletin - International Association of Engineering Geology, 51, 1995, pp 57-62. The purpose of this paper is to present a simplitied classification of geological formations, based on that presented in 1991 at the Nainville-les-Roches colloquium, specially adapted to the problems of natural slope instabilities. These geological data, taken in conjunction with other simple additional observations, will enable the person to determine the type of movement involved. (from English summary> 963307
Slope stability analysis: a kinematical approach R. L. Michalowski, Geotechnique, 45(2), 1995, pp 283-293. A stability analysis of slopes based on a translational mechanism of failure. is presented. The collapse mechanism is assumed to be in the form of rigid blocks analogous to