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Special lecture: analysis methods for assessing landslide risk — recent developments
151A 893361 Stability. of unstable final slope in deep open iron mine Mandzic, E Proc 5ttl International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P455-458. Publ Rotterdam: A A Balkema, 1988 Stability of the complex marl slope of an open pit mine has been monitored for 10 years, showing that instability is caused by pore water pressure, vibration from blasting and the effects of working the iron. The geodetic measuring programme provided information for slope failure analysis and a rheologic model for time displacement was used to analyse long term trends. The displacement of the slope is due to pore pressure as a driving force along the slide plane. The cyclic nature of rock slope displacement is explained by changes in pore pressure. 893362 Water effect in landslide slopes and its detection by radiometric methods Turcek, P; Ravinger, R; HuUa, J Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P465-469. Publ Rotterdam: A A Balkema, 1988 Surface and ground water can cause changes in the properties of rocks and soils. The shear strength may decrease, favouring activation of landslides under certain conditions, with movement generally occurring under simultaneous dilation of the environment. Water then flows more quickly through weakened zones. Prediction of landslide activity was undertaken by measuring groundwater flow velocities in observation boreholes, and the use of gamma-gamma logging in rocks to study slope movement was analysed. It is shown that radioactive logging may be used as a complementary method in field experiments. 893363 Intermittent sliding of a landslide in varved clays Van Genuchten, P M B Proe 5th International Symposium on Landslides, Lausanne, 10-15 Jaly 1988 V1, P471-476. Publ Rotterdam: A A Balkema. 1988 A landslide in the French Alps, sited on varved clays composed of dark grey laminae alternated with light silt, has been monitored. Short term continuous recording of fissure displacements showed intermittent movement on an hourly, daily and monthly basis, whilst more long term geodetic measurement showed intermittent sliding on an annual basis. Factors affecting the movements are presence/absence of room to move, fluctuations in precipitation and evapotranspiration (diurnal, seasonal) and roughness of the slip plane. 893364 Treering patterns and the frequency and intensity of mass movements Weiss, E E J Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P481-488. Publ Rotterdam: A A Balkema, 1988 The Iongterm stability of landslides is difficult to assess. A method is introduced which uses tree ring patterns to determine the history of mass movements. Trees react to tilting by trying to restore the original growth form, causing the formation of eccentric growth rings, so that a strong increase in relative eccentricity indicates landsliding the previous year. A field test of the method is presented, showing regular periodic movement. No influence of forest growth on mass movement could be demonstrated.
893365 Landslide stability evaluation for Hancheng electric plant applying AE activities Yu, J M Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P485-488. Publ Rotterdam: A A Balkema, 1988 A landslide on a sandstone/mudstone bedrock overlain by loess has been monitored using acoustic emission. The method is shown to be useful in stability analysis if background noise is known, and can be used to determine slide mechanism, stability and slip zone location. 893366 Special lecture: probabilistic assessment of earth slope stability by variance reduction and nearest-neighbor methods Bergado, D T; Miura, N; Onitsuka, K; Anderson, L R; Bowles, D S; Sharp, K D Proe 5th International Symposiam on Landslides, Lausanne, 10-15 July 1988 VI, P501-514. Publ Rotterdam: A A Balkema, 1988 Spatial variation in soil properties occurs in natural and artificial slopes, so stability may not be affected by small areas of weakness as these are compensated by strength of adjacent areas. Two methods to assess slope stability are presented. Variation reduction effects due to averaging of drained strength are shown, and a probabilistic stability analysis using the slice method developed. The influence of variance reduction and location of the failure surface on the probability of failure of an embankment demonstrates the method. The second method, nearest-neighbour, is a form of Monte Carlo simulation, and has been applied to evaluate probabilistic slope stability of a rockfill dam. An application considering pore pressure uncertainty is also presented. It is shown that probability of failure depends not only on mean and variance of soil properties but also on the nature of their spatial variation expressed by their autocorrelation. 893367 Special lecture: analysis methods for assessing landslide risk recent developments Chowdhury, R N Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P515-524. Publ Rotterdam: A A Balkema, 1988 Assessment of landslide risk using a probabilistic framework is analysed using simple analyses in relation to an infinite slope problem. Within the framework of limit equilibrium, probabilistic analysis can be made, considering potential slip surfaces of circular or arbitrary shape. Simple slope risk models, reliability based critical surfaces, spatial soil variability in probabilistic studies, and probability of progressive failure-spatial variability are considered. Bayesian approaches to update estimated risk levels are outlined. 893368 Applications of soil water finite difference models to slope stability problems Anderson, M G; Kemp, M J; Lloyd, D M Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P525-530. Publ Rotterdam: A A Balkema, 1988 Uncertainty over groundwater conditions hinders slope stability analysis. A combined hydrology and slope stability model, based on Anderson and Pope's 2-D pore pressure model, has been developed to calculate temporal and spatial changes in soil water conditions, and determine the minimum factor of
1989 Pergamon Press plc. Reproduction not permitted
893365 Landslide stability evaluation for Hancheng electric plant applying AE activities Yu, J M Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P485-488. Publ Rotterdam: A A Balkema, 1988 A landslide on a sandstone/mudstone bedrock overlain by loess has been monitored using acoustic emission. The method is shown to be useful in stability analysis if background noise is known, and can be used to determine slide mechanism, stability and slip zone location. 893366 Special lecture: probabilistic assessment of earth slope stability by variance reduction and nearest-neighbor methods Bergado, D T; Miura, N; Onitsuka, K; Anderson, L R; Bowles, D S; Sharp, K D Proe 5th International Symposiam on Landslides, Lausanne, 10-15 July 1988 VI, P501-514. Publ Rotterdam: A A Balkema, 1988 Spatial variation in soil properties occurs in natural and artificial slopes, so stability may not be affected by small areas of weakness as these are compensated by strength of adjacent areas. Two methods to assess slope stability are presented. Variation reduction effects due to averaging of drained strength are shown, and a probabilistic stability analysis using the slice method developed. The influence of variance reduction and location of the failure surface on the probability of failure of an embankment demonstrates the method. The second method, nearest-neighbour, is a form of Monte Carlo simulation, and has been applied to evaluate probabilistic slope stability of a rockfill dam. An application considering pore pressure uncertainty is also presented. It is shown that probability of failure depends not only on mean and variance of soil properties but also on the nature of their spatial variation expressed by their autocorrelation. 893367 Special lecture: analysis methods for assessing landslide risk recent developments Chowdhury, R N Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P515-524. Publ Rotterdam: A A Balkema, 1988 Assessment of landslide risk using a probabilistic framework is analysed using simple analyses in relation to an infinite slope problem. Within the framework of limit equilibrium, probabilistic analysis can be made, considering potential slip surfaces of circular or arbitrary shape. Simple slope risk models, reliability based critical surfaces, spatial soil variability in probabilistic studies, and probability of progressive failure-spatial variability are considered. Bayesian approaches to update estimated risk levels are outlined. 893368 Applications of soil water finite difference models to slope stability problems Anderson, M G; Kemp, M J; Lloyd, D M Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P525-530. Publ Rotterdam: A A Balkema, 1988 Uncertainty over groundwater conditions hinders slope stability analysis. A combined hydrology and slope stability model, based on Anderson and Pope's 2-D pore pressure model, has been developed to calculate temporal and spatial changes in soil water conditions, and determine the minimum factor of
1989 Pergamon Press plc. Reproduction not permitted