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Prediction model of landslides in tropical areas by means of discriminant analysis
67A a62222
Devastation of the environment by landslides activated by construction Mahr, T; Malgot. J Int Assoc Engng Geol Bull N31, June 1985, P81-88
Using information from actual examples of incorrect procedures in erection of some ground, hydrotechnical and transport construction projects, the causes of landslide reactivation and devastation of the environment are analyzed. To avoid deleterious changes in the geological environment, engineering geological maps are prepared for more important construction projects, detailing predicted engineering geological consequences of these works. 862223 Landslides in the city of Lyons, France (In French) Mongereau, N; Sanglerat, G; David, L; Millers, H Int Assoc Engng Geol Bull N31, June 198.5. P95-103
Summary of the typical landslides which have occurred in Lyons, France, since 1930, on the sides of several hills. Superficial slides concerned natural or added materials behind various retaining walls. Rainfall or water escaping from leaking hydraulic structures were the main causes. The different preventive measures are discussed. 862224 Avalanche protection of roads, possibilities and developments (In Norwegian) Norem, H Norw Geotech Znst Pub1 N1.57. 1985, P9-10
Projects initiated by the Committee of Snow on Roads at the Norwegian Road Department are briefly surveyed. Most successful were those on avalanche forecasting and warning, the use of earth structures for protection and artificial triggering of avalanches by explosions. 862225 Some landslipping encountered during construction of the A40 near Momnouth Early, K R; Jordan, P G Q J Engng Geol V18. N3, 1985, P207-224 An investigation was carried out after major ground movements were observed on an embankment of the A40. This included a topographical survey; production of a geotechnical map; investigation of the geometry and nature of the landslips and of the geological structure, with the aid of boreholes and pits; monitoring of all ground movement; investigation of the hydrogeology with particular reference to the pore water pressures within the shear surfaces; and laboratory tests of the strength and other properties of the clay in the slipped masses. 862226 Development and application of a combined soil water-slope stability model Anderson, M G; Howes, S Q J Engng Geol V18, NJ, 1985, P225-236 A one dimensional soil water infiltration scheme is coupled to an infinite slope stability analysis model to illustrate the potential of exploring the impact of soil suction and parameter variability in stability analysis, with reference to slope conditions in Hong Kong. The current procedures, derived from strength tests, do not accurately reflect the strength of the residual soils examined. The need of two-dimensional modelling in the context of both soil suction/pore pressure models and stability analysis is discussed. 0
8622R Prediction model of landslides in tropical areas by means of discriminant analysis Neuland, H Proc 1st International Conference on Geomechanics in Tropical Lateritic and Saproliric Soils, Brasilia, II-14 February 1985 V2, P29-40. Pub1 Sao Paulo: Bra:ilian Societ? for Soil Mechanics, 1985
Morphometric, hydrometeorological, ecological, soil physical, soil mechanical, biogeographical and stratification data from 163 stable and unstable tropical soil slopes have been examined statistically using the discriminant analysis technique. Variables with the highest prediction power in the resulting simplistic model to predict slope stability are: depth of weathering, the drainage area to the site of investigation, a shear strength parameter on the boundary of the bed, and the density of the inferior layers. The model accurately predicted the conditions on 45 of 50 stable and unstable sites. 862228 Regress failures originated by relict structures in saprolites Nieble, C M; Cornides, A T; Fernandes, A J Proc 1st International Conference on Geomechanics in Tropical Lateritic and Saprolitic Soils, Brasilia, 11-14 February 1985 V2, P41-48. Publ Sao Paulo: Brazilian Society for Soil Mechanics, 1985
Regressive failures are characterised by their development in successive stages towards the top of a slope. A series of simple circular slips occurs successively, such that each slip affects the stability of the mass just behind it. The influence of relict structures, joints, shear planes or schistocity, inherited from the original rock mass, on regressive failure of slopes of tropical residual soil is examined. It is seen that for the case investigated, a minor slide is seen to originate in an area of low shear strength due to a relict discontinuity. This causes tension cracking in the upper level which initiates the initial circulartranslational failure. Heavy rainfall, and the percolation of rainwater through planes of weakness and tension cracks, accelerates the failure. 862229 Slides in saprolites from gneissic rocks with relic slip surfaces. The B.N.D.E.S. case history Costa Nunes, A J; Fernandes, C E M Proc 1st International Conference on Geomechanics in Tropical Lateritic and Saprolitic Soils, Brasilia, II-14 February 1985 V2, P49-59. Pub1 Sao Paulo: Brazilian Society for Soil Mechanics, 1985
The massive slope failure of the Morro de Sao Antonio slope facing the B.N.D.E.S. building in Rio de Janeiro is examined. The slope material was weathered residual soil formed from hornblende-biotite-gneiss. The gneiss was banded and relict slip surfaces were imprinted on its saprolite. The low shear strength along the relict slip surface, coupled with heavy rainfall, were concluded to bc the probable trigger mechanism of the failure. The general conditions related to relict slip surfaces are considered. 862230 Pore pressures due to infiltration into partly saturated slopes Vaughan, P R Proc 1st International Conference on Geomechdcs in Tropical Lateritic and Saprolitic So&, Brasilia, II-14 February 1985 V2, P61-71. Pub1 Sao Paula: Brazilian Society for Soil Mechanics, 1985
Extensive failures of natural slopes of residual soil occurred in Fiji in 1980 after a period of exceptionally heavy rainfall. This suggests a threshold effect may operate where there would be a
1986 Pergamon Press Ltd. Reproduction
not permitted
Devastation of the environment by landslides activated by construction Mahr, T; Malgot. J Int Assoc Engng Geol Bull N31, June 1985, P81-88
Using information from actual examples of incorrect procedures in erection of some ground, hydrotechnical and transport construction projects, the causes of landslide reactivation and devastation of the environment are analyzed. To avoid deleterious changes in the geological environment, engineering geological maps are prepared for more important construction projects, detailing predicted engineering geological consequences of these works. 862223 Landslides in the city of Lyons, France (In French) Mongereau, N; Sanglerat, G; David, L; Millers, H Int Assoc Engng Geol Bull N31, June 198.5. P95-103
Summary of the typical landslides which have occurred in Lyons, France, since 1930, on the sides of several hills. Superficial slides concerned natural or added materials behind various retaining walls. Rainfall or water escaping from leaking hydraulic structures were the main causes. The different preventive measures are discussed. 862224 Avalanche protection of roads, possibilities and developments (In Norwegian) Norem, H Norw Geotech Znst Pub1 N1.57. 1985, P9-10
Projects initiated by the Committee of Snow on Roads at the Norwegian Road Department are briefly surveyed. Most successful were those on avalanche forecasting and warning, the use of earth structures for protection and artificial triggering of avalanches by explosions. 862225 Some landslipping encountered during construction of the A40 near Momnouth Early, K R; Jordan, P G Q J Engng Geol V18. N3, 1985, P207-224 An investigation was carried out after major ground movements were observed on an embankment of the A40. This included a topographical survey; production of a geotechnical map; investigation of the geometry and nature of the landslips and of the geological structure, with the aid of boreholes and pits; monitoring of all ground movement; investigation of the hydrogeology with particular reference to the pore water pressures within the shear surfaces; and laboratory tests of the strength and other properties of the clay in the slipped masses. 862226 Development and application of a combined soil water-slope stability model Anderson, M G; Howes, S Q J Engng Geol V18, NJ, 1985, P225-236 A one dimensional soil water infiltration scheme is coupled to an infinite slope stability analysis model to illustrate the potential of exploring the impact of soil suction and parameter variability in stability analysis, with reference to slope conditions in Hong Kong. The current procedures, derived from strength tests, do not accurately reflect the strength of the residual soils examined. The need of two-dimensional modelling in the context of both soil suction/pore pressure models and stability analysis is discussed. 0
8622R Prediction model of landslides in tropical areas by means of discriminant analysis Neuland, H Proc 1st International Conference on Geomechanics in Tropical Lateritic and Saproliric Soils, Brasilia, II-14 February 1985 V2, P29-40. Pub1 Sao Paulo: Bra:ilian Societ? for Soil Mechanics, 1985
Morphometric, hydrometeorological, ecological, soil physical, soil mechanical, biogeographical and stratification data from 163 stable and unstable tropical soil slopes have been examined statistically using the discriminant analysis technique. Variables with the highest prediction power in the resulting simplistic model to predict slope stability are: depth of weathering, the drainage area to the site of investigation, a shear strength parameter on the boundary of the bed, and the density of the inferior layers. The model accurately predicted the conditions on 45 of 50 stable and unstable sites. 862228 Regress failures originated by relict structures in saprolites Nieble, C M; Cornides, A T; Fernandes, A J Proc 1st International Conference on Geomechanics in Tropical Lateritic and Saprolitic Soils, Brasilia, 11-14 February 1985 V2, P41-48. Publ Sao Paulo: Brazilian Society for Soil Mechanics, 1985
Regressive failures are characterised by their development in successive stages towards the top of a slope. A series of simple circular slips occurs successively, such that each slip affects the stability of the mass just behind it. The influence of relict structures, joints, shear planes or schistocity, inherited from the original rock mass, on regressive failure of slopes of tropical residual soil is examined. It is seen that for the case investigated, a minor slide is seen to originate in an area of low shear strength due to a relict discontinuity. This causes tension cracking in the upper level which initiates the initial circulartranslational failure. Heavy rainfall, and the percolation of rainwater through planes of weakness and tension cracks, accelerates the failure. 862229 Slides in saprolites from gneissic rocks with relic slip surfaces. The B.N.D.E.S. case history Costa Nunes, A J; Fernandes, C E M Proc 1st International Conference on Geomechanics in Tropical Lateritic and Saprolitic Soils, Brasilia, II-14 February 1985 V2, P49-59. Pub1 Sao Paulo: Brazilian Society for Soil Mechanics, 1985
The massive slope failure of the Morro de Sao Antonio slope facing the B.N.D.E.S. building in Rio de Janeiro is examined. The slope material was weathered residual soil formed from hornblende-biotite-gneiss. The gneiss was banded and relict slip surfaces were imprinted on its saprolite. The low shear strength along the relict slip surface, coupled with heavy rainfall, were concluded to bc the probable trigger mechanism of the failure. The general conditions related to relict slip surfaces are considered. 862230 Pore pressures due to infiltration into partly saturated slopes Vaughan, P R Proc 1st International Conference on Geomechdcs in Tropical Lateritic and Saprolitic So&, Brasilia, II-14 February 1985 V2, P61-71. Pub1 Sao Paula: Brazilian Society for Soil Mechanics, 1985
Extensive failures of natural slopes of residual soil occurred in Fiji in 1980 after a period of exceptionally heavy rainfall. This suggests a threshold effect may operate where there would be a
1986 Pergamon Press Ltd. Reproduction
not permitted