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Risk updating for rainfall-triggered spoil failures
206A 894295 Case study of slope stability during rainfall Matsuo, M: Suzuki, H Natural Disaster Sci VIO, NI. 1988, P15-28 A method for slope stability analysis during rainfall is presented. Information on seepage and strength properties of partially saturated soils as well as initial and boundary conditions for flow analysis are required. A series of triaxial compression tests was carried out, which highlighted differences in soil strength produced by variations in drainage conditions, whilst the coefficient of permeability was estimated using data from the pF test. The finite element method was used to analyse case records of slope failure during recorded rainfall conditions,showing a change in safety factor over time, which correlated with rainfall intensity.
894296 Concept of the master profile for tailings dam beaches Blight, G E Proc International Symposium on Prediction and Performance in Geotechnical Engineering, Calgary, 17-19 June 1987 P361365, Publ Rotterdam." A A Balkema, 1987 A dimensionless equation is derived for the master profile of a hydraulic fill beach, which is the same for all beaches of a specific material deposited at a specific solids concentration. Particle size sorting along a beach may also be predicted from a simple expression, and the variation in railings permeability and the position of the phreatic surface estimated.
894297 Risk updating for rainfall-triggered spoil failures Chowdhury, R N; Nguyen, V U Proc International Symposium on Prediction and Performance in Geotechnical Engineering, Calgary, 17-19 June 1987 P439444. Publ Rotterdam: ,4 A Balkema. 1987 The importance of rainfall triggered slope failures associated with strip mining and the difficulties in prediction are highlighted. Methods to estimate factor of safety or risk of failure are reviewed. The role of water, especially of moisture softening, is emphasised. A model for updating risk, based on updating estimated service life every time some failure occurs (inverse of critical rainfall frequency), is examined and an illustrated example provided.
894298 Verification of soil slope instability using level one stability analysis Ristau, J M Proc 24th Symp on Engineering Geology and Soils Engineering, Coeur d'Alene, 29 Feb-2 March 1988 P333-344. Publ Washington: Washington State Unirersity, 1988 Level one stability analysis (LISA) is a statistical program for areal slope stability with respect to translational slope failure using the infinite slope analysis equation. The program is used to evaluate stability of 8 rotational failures at Dungeness River, Washington. Two programs, SSIS and GEOSLP, were used to convert the data to approximated translational slope failure criteria. The LISA output, used as an estimate of the percentage of study area expected to fail, showed good correlation with existing percentage of area in failure within the study area.
894299 Cliff line collapse associated with mining activities Pells, P J N; Braybrooke, J C; Mong, J; Kotze, G P Proc Symposium on Soil Slope Instability and Stabilisation, Sydney, 30 Norember-2 December 1987 P359-385. Publ Rotterdam." A A Balkema. 1987 Rockfalls and landslides in sandstone escarpments at 8 sites in the Sydney Basin, Australia, where coal or oil shale extraction has occurred beneath or adjacent to the escarpment, have been studied. All failures were associated with large areas of full extraction. The largest falls required a combination of full extraction with specific geological features. The failure mechanism comprises basal shear and crushing beneath massive sandstone slabs which have separated from the cliff line as a result of mining subsidence. 894300 Garden Island Car Park slope stabilisation works Phillips, A B Proc Symposium on Soil Slope Instability and Stabilisation, Sydney, 30 November-2 December 1987 P387-396. Publ Rotterdam: A A Balkema. 1987 Inspection of the cliff face above the proposed car park revealed a large detached block, separated from the rock mass by an open joint, a common feature of Hawkesbury sandstone in the Sydney Basin. A shale layer underlay the loose block. The site investigation undertaken is described. Remedial measures installed were passive anchors through the block into the rock mass, inclined boreholes to improve drainage, and removal of weathered shale and underpinning and shotcreting. Readings from extensometers installed indicate block movement is negligible to date. 894301 Monitored failure of an excavation in an ancient landslide within the Newcastle coal measures Rigby, R J; Carr, R J Proc Symposium on Soil Slope Instability and Stabilisation, Sydney, 30 November-2 December 1987 P397-402. Publ Rotterdam: A A Balkema, 1987 A landslide due to the reactivation of an ancient slide caused by mining excavation is described. Toppling failure of the highwall was observed initially. Movement was monitored. Slickensided shear planes in tuffaceous clay layers were located, block samples taken, and geotechnical properties measured. The failure was analysed with specific interest in effects of the low residual shear strength of the clay, rainfall and drainage. It was not possible to identify the mechanism that produced the slide plane in the ancient slide, although several suggestions are made. 894302 Prediction method by grey system for slope deformation and failure Chen, M D; Wang, L S Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P577.582. Publ Rotterdam: A A Balkema, 1988 A new landslide prediction method, based on grey system theory with analysis of the mechanics of slope deformation and failure, has been developed. Principles of grey systems theory and method, including selection and wave filtering of data, generation of data, model establishment and resonant-difference grey model, are described. The method is verified by application to 2 landslides in China.
,~ 1989 Pergamon Press plc. Reproduction not permitted
894296 Concept of the master profile for tailings dam beaches Blight, G E Proc International Symposium on Prediction and Performance in Geotechnical Engineering, Calgary, 17-19 June 1987 P361365, Publ Rotterdam." A A Balkema, 1987 A dimensionless equation is derived for the master profile of a hydraulic fill beach, which is the same for all beaches of a specific material deposited at a specific solids concentration. Particle size sorting along a beach may also be predicted from a simple expression, and the variation in railings permeability and the position of the phreatic surface estimated.
894297 Risk updating for rainfall-triggered spoil failures Chowdhury, R N; Nguyen, V U Proc International Symposium on Prediction and Performance in Geotechnical Engineering, Calgary, 17-19 June 1987 P439444. Publ Rotterdam: ,4 A Balkema. 1987 The importance of rainfall triggered slope failures associated with strip mining and the difficulties in prediction are highlighted. Methods to estimate factor of safety or risk of failure are reviewed. The role of water, especially of moisture softening, is emphasised. A model for updating risk, based on updating estimated service life every time some failure occurs (inverse of critical rainfall frequency), is examined and an illustrated example provided.
894298 Verification of soil slope instability using level one stability analysis Ristau, J M Proc 24th Symp on Engineering Geology and Soils Engineering, Coeur d'Alene, 29 Feb-2 March 1988 P333-344. Publ Washington: Washington State Unirersity, 1988 Level one stability analysis (LISA) is a statistical program for areal slope stability with respect to translational slope failure using the infinite slope analysis equation. The program is used to evaluate stability of 8 rotational failures at Dungeness River, Washington. Two programs, SSIS and GEOSLP, were used to convert the data to approximated translational slope failure criteria. The LISA output, used as an estimate of the percentage of study area expected to fail, showed good correlation with existing percentage of area in failure within the study area.
894299 Cliff line collapse associated with mining activities Pells, P J N; Braybrooke, J C; Mong, J; Kotze, G P Proc Symposium on Soil Slope Instability and Stabilisation, Sydney, 30 Norember-2 December 1987 P359-385. Publ Rotterdam." A A Balkema. 1987 Rockfalls and landslides in sandstone escarpments at 8 sites in the Sydney Basin, Australia, where coal or oil shale extraction has occurred beneath or adjacent to the escarpment, have been studied. All failures were associated with large areas of full extraction. The largest falls required a combination of full extraction with specific geological features. The failure mechanism comprises basal shear and crushing beneath massive sandstone slabs which have separated from the cliff line as a result of mining subsidence. 894300 Garden Island Car Park slope stabilisation works Phillips, A B Proc Symposium on Soil Slope Instability and Stabilisation, Sydney, 30 November-2 December 1987 P387-396. Publ Rotterdam: A A Balkema. 1987 Inspection of the cliff face above the proposed car park revealed a large detached block, separated from the rock mass by an open joint, a common feature of Hawkesbury sandstone in the Sydney Basin. A shale layer underlay the loose block. The site investigation undertaken is described. Remedial measures installed were passive anchors through the block into the rock mass, inclined boreholes to improve drainage, and removal of weathered shale and underpinning and shotcreting. Readings from extensometers installed indicate block movement is negligible to date. 894301 Monitored failure of an excavation in an ancient landslide within the Newcastle coal measures Rigby, R J; Carr, R J Proc Symposium on Soil Slope Instability and Stabilisation, Sydney, 30 November-2 December 1987 P397-402. Publ Rotterdam: A A Balkema, 1987 A landslide due to the reactivation of an ancient slide caused by mining excavation is described. Toppling failure of the highwall was observed initially. Movement was monitored. Slickensided shear planes in tuffaceous clay layers were located, block samples taken, and geotechnical properties measured. The failure was analysed with specific interest in effects of the low residual shear strength of the clay, rainfall and drainage. It was not possible to identify the mechanism that produced the slide plane in the ancient slide, although several suggestions are made. 894302 Prediction method by grey system for slope deformation and failure Chen, M D; Wang, L S Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P577.582. Publ Rotterdam: A A Balkema, 1988 A new landslide prediction method, based on grey system theory with analysis of the mechanics of slope deformation and failure, has been developed. Principles of grey systems theory and method, including selection and wave filtering of data, generation of data, model establishment and resonant-difference grey model, are described. The method is verified by application to 2 landslides in China.
,~ 1989 Pergamon Press plc. Reproduction not permitted