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Slope stability analyses using the principle of maximum entropy
210A 894327 Probabilistic analysis for wave or earthquake induced instability of submarine slopes Rahman, M S: Hwang, C H; Jaber, W Y Proc 5th International Symposium on Landslides. Lausanne. 10-15 July 1988 VI. P743-747. Publ Rotterdam." A A Balkema, 1988
89433 ! Prediction of slope failures due to heavy rains using the tank model Shimizu, M Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P771-776. Publ Rotterdam: A ,4 Balkema. 1988
Wave action during severe storms or seismic action can cause failure in offshore cohesive sediment slopes, leading to marine landslides. Probabilistic analysis of such failure is presented in terms of total stress. Two case studies are shown, and in both significant zones with high probability of failure are indicated. This is in general agreement with observations. The procedure may be used to identi~' potentially unstable seafloor regions under given cyclic Ioadings.
Stability of a soil slope is affected by the amount of water which infiltrates the slope and is retained in the subsoil within the slope. Using the tank model (Michiue and Kojima), which was developed to analyse runoff characteristics of watersheds, the storage height in the tanks can simulate the amount of water in the subsoil and thus indicate danger of failure. A simplified method of application of the tank model is presented and its validity examined by its use to analyse a case history of slope failure.
894328 Slope stability analyses using the principle of maximum entropy Read, J R L; Hart, M E Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P749-755. Publ Rotterdam." A A Balkema, 1988 A probabilistic solution to stability analysis of slopes is presented which enables the most critical surface to be identified using only measured parametric values. Forces and moments acting on individual slices are balanced in such a manner that probabilities of failure arc equated for each slice, rather than factors of safety as in conventional analysis. The resulting distribution maximiscs the measure of uncertainty (entropy) of the system. The end result is the least biased model. The computed probability o[" failure is a global value that provides a linearly scaled measure of the expected performance of the slope. 894329 Landslide mobility and remedial measures Salt, G Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI. P757-762. Publ Rotterdam: A A Balkema. 1988 Reactivation of landslides which are dormant or moving very slowly on deep seated failure surfaces is possible during major construction projects, despite prolonged precursory observation. Field and laboratory characteristics of slide materials have been examined, and are discussed with reference to interpretation of deformation monitoring using case study details, including the Vaiont. Ruahihi, and Abbotsford slides. Possible remedial measures are also considered. 894330 Effective stress, limit equilibrium back-analysis of failed slopes: guidelines Sauer, E K; Fredlund, D G Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P763-770. Publ Rotterdam: A A Balkema, 1988 Guidelines are discussed under three categories. At the site, structure and stratigraphy provide valuable input, back analysis is sensitive to measured slope angle, shear strength should be tested parametrically, piezometric measurements should be made, whilst geometry, depth and length of the failure surface have significant influence on calculated cohesion. A moment equilibrium factor of safety equation is recommended. The following should be investigated parametrically: failure surface topography, surface topography, pore pressure, shear parameters, and unit weight of materials. Examples of the procedures are shown.
894332 Three dimensional slope stability analysis with random generation of surfaces Thomaz, J E; Lovell, C W Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI. P777-781. Publ Rotterdam." A ,4 Balkema. 1988 The popular two dimensional slope stability program STABL (Siegel, 1975) has the capability to search for the most critical surface of a given slope, whatever its geometry. To better simulate real slides, 3D-PCSTABL has been developed. A routine generates random three dimensional surfaces,while the program automatically searches for the most critical one. A generalisation of the limit equilibrium method of columns (Chen, 1981) is employed in the analysis. The procedure is described and selected results of its application presented. 894333 Analysis and monitoring of a large landslide in Colombian Andes (In French) Nhiem, J T V; Guilloux, A: D'Apolito, P Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P783-788. Publ Rotterdam. A A Balkema. 1988 A large landslide, with about I million cubic metres of sliding mass, was reactivated during access road construction. The failure surface cut through surface colluvium and a thick layer containing rock blocks up to about lm in size, over siltstone and quartzite bedrock. The morphology and kinematics of the slide were studied, and correlation between slope movement and rainfall established. On this basis, limited use of the road was allowed, without the need for expensive remedial works. 894334 Attempt to predict the failure of a mountainous slope at SaintEtienne-de-Tinee, France (in French) Vibert, C; Arnould, M; Cojean, R; Le Cleac'h, J M Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P789-792. Publ Rotterdam." A A Balkema, 1988 The movement of a slope of height 600m above a road in a glacial valley has been monitored. Only surface data from 20 targets on the slope are available, but sudden failure of the right part of the slope is considered possible. Two different extrapolation methods, those of Kennedy and Voight (1983) and Fukuzono (1985) are applied to the displacement-time data to predict failure date.
1989 Pergamon Press plc. Reproduction not permitted
89433 ! Prediction of slope failures due to heavy rains using the tank model Shimizu, M Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P771-776. Publ Rotterdam: A ,4 Balkema. 1988
Wave action during severe storms or seismic action can cause failure in offshore cohesive sediment slopes, leading to marine landslides. Probabilistic analysis of such failure is presented in terms of total stress. Two case studies are shown, and in both significant zones with high probability of failure are indicated. This is in general agreement with observations. The procedure may be used to identi~' potentially unstable seafloor regions under given cyclic Ioadings.
Stability of a soil slope is affected by the amount of water which infiltrates the slope and is retained in the subsoil within the slope. Using the tank model (Michiue and Kojima), which was developed to analyse runoff characteristics of watersheds, the storage height in the tanks can simulate the amount of water in the subsoil and thus indicate danger of failure. A simplified method of application of the tank model is presented and its validity examined by its use to analyse a case history of slope failure.
894328 Slope stability analyses using the principle of maximum entropy Read, J R L; Hart, M E Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P749-755. Publ Rotterdam." A A Balkema, 1988 A probabilistic solution to stability analysis of slopes is presented which enables the most critical surface to be identified using only measured parametric values. Forces and moments acting on individual slices are balanced in such a manner that probabilities of failure arc equated for each slice, rather than factors of safety as in conventional analysis. The resulting distribution maximiscs the measure of uncertainty (entropy) of the system. The end result is the least biased model. The computed probability o[" failure is a global value that provides a linearly scaled measure of the expected performance of the slope. 894329 Landslide mobility and remedial measures Salt, G Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI. P757-762. Publ Rotterdam: A A Balkema. 1988 Reactivation of landslides which are dormant or moving very slowly on deep seated failure surfaces is possible during major construction projects, despite prolonged precursory observation. Field and laboratory characteristics of slide materials have been examined, and are discussed with reference to interpretation of deformation monitoring using case study details, including the Vaiont. Ruahihi, and Abbotsford slides. Possible remedial measures are also considered. 894330 Effective stress, limit equilibrium back-analysis of failed slopes: guidelines Sauer, E K; Fredlund, D G Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P763-770. Publ Rotterdam: A A Balkema, 1988 Guidelines are discussed under three categories. At the site, structure and stratigraphy provide valuable input, back analysis is sensitive to measured slope angle, shear strength should be tested parametrically, piezometric measurements should be made, whilst geometry, depth and length of the failure surface have significant influence on calculated cohesion. A moment equilibrium factor of safety equation is recommended. The following should be investigated parametrically: failure surface topography, surface topography, pore pressure, shear parameters, and unit weight of materials. Examples of the procedures are shown.
894332 Three dimensional slope stability analysis with random generation of surfaces Thomaz, J E; Lovell, C W Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI. P777-781. Publ Rotterdam." A ,4 Balkema. 1988 The popular two dimensional slope stability program STABL (Siegel, 1975) has the capability to search for the most critical surface of a given slope, whatever its geometry. To better simulate real slides, 3D-PCSTABL has been developed. A routine generates random three dimensional surfaces,while the program automatically searches for the most critical one. A generalisation of the limit equilibrium method of columns (Chen, 1981) is employed in the analysis. The procedure is described and selected results of its application presented. 894333 Analysis and monitoring of a large landslide in Colombian Andes (In French) Nhiem, J T V; Guilloux, A: D'Apolito, P Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P783-788. Publ Rotterdam. A A Balkema. 1988 A large landslide, with about I million cubic metres of sliding mass, was reactivated during access road construction. The failure surface cut through surface colluvium and a thick layer containing rock blocks up to about lm in size, over siltstone and quartzite bedrock. The morphology and kinematics of the slide were studied, and correlation between slope movement and rainfall established. On this basis, limited use of the road was allowed, without the need for expensive remedial works. 894334 Attempt to predict the failure of a mountainous slope at SaintEtienne-de-Tinee, France (in French) Vibert, C; Arnould, M; Cojean, R; Le Cleac'h, J M Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P789-792. Publ Rotterdam." A A Balkema, 1988 The movement of a slope of height 600m above a road in a glacial valley has been monitored. Only surface data from 20 targets on the slope are available, but sudden failure of the right part of the slope is considered possible. Two different extrapolation methods, those of Kennedy and Voight (1983) and Fukuzono (1985) are applied to the displacement-time data to predict failure date.
1989 Pergamon Press plc. Reproduction not permitted