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Stabilization of open pit slopes through blasting
271A factor of safety of these slopes. The conventional method of analysis using soil shear strength parameters from triaxial testscan lead to unrealistically low safety factors for existing slopes." 895339 Riverbank stabilization by drains in plastic clay Lew, K V; Graham, J Prnc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2, P939-944. Pubi Rotterdam: A A Balkema, 1988 The banks of the Red and Assiniboine rivers in Winnipeg contain many unstable sections where slides have occurred in the plastic clay layer. Compacted sand fill drains provide effective stabilisation for river banks in fissured plastic clay. The drains have led to a 15% improvement in safety factor when the groundwater was lowered 2-3m, and improve stability further by their added mechanical strength. Two examples are presented to illustrate the use of such drains to stabilise the slopes.
89534O Stabilization of open pit slopes through blasting List, B R Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2, P945-952. Publ Rotterdam: A A Balkema. 1988 Excavation of oil sands produces the risk of large block slides. These block slides occur on steeply dipping weak clay layers accompanied by high pore pressures. To enhance slope stability in critical areas, a remedial stabilisation program using blasting has been developed. Blasting with ANFO is used to disturb the critical geological structures and reduce pore pressures. As this also reduces the strength of the adjacent material, instrumentation has monitored blast induced effects. Results are incorporated into blast design and subsequent instrumentation to ensure a safe and efficient dragline mining operation.
895341 Problems in the design of a national roadway through an unstable valley Llorca, J; Delgado, C Proe 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2, P953-957. Publ Rotterdam: A A Baikema, 1988 Problems encountered whilst driving a road through the Cobas Valley where the slopes are naturally unstable are described. The geology comprises limestone overlying schist. The causes of instability are outlined. Three problems and their correction are described: (1) sliding of a reinforced wall and rubble slope, corrected by drainage and construction of a viaduct on piles, anchored to the bedrock; (2) collapse of a tunnel, which was grouted; and (3) landslipping due to excess water, which carried schist debris. This was overcome by drainage.
895342 Slope stability analysis and control in urban areas Popescu, M E; Dragomir, N; Burilescu, T Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2, P971-978. Publ Rotterdam: A A Balkema. 1988 Three case studies are presented to show slope stability analysis and stabilisation methods being undertaken in urban areas of Romania. The slide at Iassy in weathered clays was controlled by large numbers of discontinuities. Back analysis was
used to study stability and design the stabilisation. At Suceava, a loess and clay slide was stabilised by drainage. At Oradea, instability was due to deforestation and was associated with heavy rainfall. Stabilisation consisted of diaphragm walls and a deep drainage system, along with replanting the slope. 895343 Investigation and stabilization of unstable slopes in the Lombach Valley near Interlaken, Switzerland (In French) Reider, U; lschi, H Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2. P979-981. Publ Rotterdam: A A Balkema, 1988 Landslides and creep have been threatening an access road in the Lombach valley for some time. Field studies, including geological and hydrological analysis and inclinometer tests, were carried out to examine the slide. Remedial measures consisted of pressureless grouting, drainage,improvement of the river bed by soil nailing and barrages to reduce erosion. 895344 Stabilization by nailing of unstable slopes in difficult setting (In French) Sanglerat, G; Barnoud, F; Sanglerat, T R Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2, P983-987. Publ Rotterdam: A A Balkema, 1988 Failure of a slope and embankment threatened houses and their foundations. Nailing the slope was considered the best option. A preliminary geotechnical study, using pressuremeters and penetrometers, and a stability analysis showed instability was due to excessive slope angle, absence of compaction and obstruction of the stream bed. The successful soil nailing undertaken is described. 895345 Study of five embankment slope failures Otoko, G R Proc Ninth Regional Conference for Africa on Soil Mechanics and Foundation Engineering, Lagos, September 1987 Vi, P363-370. Publ Rotterdam: A A Balkema. 1987 Effective stress stability analysis was conducted on 5 embankment slope failures. The materials involved in sliding were clays of different plasticities. Safety factor is shown to be directly proportional to liquid limit and plasticity index, and is accurate for low plasticity soils but increasingly overestimated as plasticity increases. An empirical method to correct this overestimation is presented.
Earth retaining structures 895346 Deterioration of a wall complex constructed of reinforced earth Blight, G E; Dane, M S W Geotechnique V39, NI. March 1989, 1'47-53 Study of a reinforced earth wall showed the galvanised reinforcing strips were suffering from severe pitting corrosion. This deterioration was caused by contact with lumps of clay formed by the fine fraction of the fill, and led to unevenly distributed reduced strength. Wall movement was monitored and tension in the reinforcing strips measured in situ. The walls were demolished and rebuilt 8 years after construction.
1989 Pergamon Press plc. Reproduction not permitted
89534O Stabilization of open pit slopes through blasting List, B R Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2, P945-952. Publ Rotterdam: A A Balkema. 1988 Excavation of oil sands produces the risk of large block slides. These block slides occur on steeply dipping weak clay layers accompanied by high pore pressures. To enhance slope stability in critical areas, a remedial stabilisation program using blasting has been developed. Blasting with ANFO is used to disturb the critical geological structures and reduce pore pressures. As this also reduces the strength of the adjacent material, instrumentation has monitored blast induced effects. Results are incorporated into blast design and subsequent instrumentation to ensure a safe and efficient dragline mining operation.
895341 Problems in the design of a national roadway through an unstable valley Llorca, J; Delgado, C Proe 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2, P953-957. Publ Rotterdam: A A Baikema, 1988 Problems encountered whilst driving a road through the Cobas Valley where the slopes are naturally unstable are described. The geology comprises limestone overlying schist. The causes of instability are outlined. Three problems and their correction are described: (1) sliding of a reinforced wall and rubble slope, corrected by drainage and construction of a viaduct on piles, anchored to the bedrock; (2) collapse of a tunnel, which was grouted; and (3) landslipping due to excess water, which carried schist debris. This was overcome by drainage.
895342 Slope stability analysis and control in urban areas Popescu, M E; Dragomir, N; Burilescu, T Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2, P971-978. Publ Rotterdam: A A Balkema. 1988 Three case studies are presented to show slope stability analysis and stabilisation methods being undertaken in urban areas of Romania. The slide at Iassy in weathered clays was controlled by large numbers of discontinuities. Back analysis was
used to study stability and design the stabilisation. At Suceava, a loess and clay slide was stabilised by drainage. At Oradea, instability was due to deforestation and was associated with heavy rainfall. Stabilisation consisted of diaphragm walls and a deep drainage system, along with replanting the slope. 895343 Investigation and stabilization of unstable slopes in the Lombach Valley near Interlaken, Switzerland (In French) Reider, U; lschi, H Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2. P979-981. Publ Rotterdam: A A Balkema, 1988 Landslides and creep have been threatening an access road in the Lombach valley for some time. Field studies, including geological and hydrological analysis and inclinometer tests, were carried out to examine the slide. Remedial measures consisted of pressureless grouting, drainage,improvement of the river bed by soil nailing and barrages to reduce erosion. 895344 Stabilization by nailing of unstable slopes in difficult setting (In French) Sanglerat, G; Barnoud, F; Sanglerat, T R Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V2, P983-987. Publ Rotterdam: A A Balkema, 1988 Failure of a slope and embankment threatened houses and their foundations. Nailing the slope was considered the best option. A preliminary geotechnical study, using pressuremeters and penetrometers, and a stability analysis showed instability was due to excessive slope angle, absence of compaction and obstruction of the stream bed. The successful soil nailing undertaken is described. 895345 Study of five embankment slope failures Otoko, G R Proc Ninth Regional Conference for Africa on Soil Mechanics and Foundation Engineering, Lagos, September 1987 Vi, P363-370. Publ Rotterdam: A A Balkema. 1987 Effective stress stability analysis was conducted on 5 embankment slope failures. The materials involved in sliding were clays of different plasticities. Safety factor is shown to be directly proportional to liquid limit and plasticity index, and is accurate for low plasticity soils but increasingly overestimated as plasticity increases. An empirical method to correct this overestimation is presented.
Earth retaining structures 895346 Deterioration of a wall complex constructed of reinforced earth Blight, G E; Dane, M S W Geotechnique V39, NI. March 1989, 1'47-53 Study of a reinforced earth wall showed the galvanised reinforcing strips were suffering from severe pitting corrosion. This deterioration was caused by contact with lumps of clay formed by the fine fraction of the fill, and led to unevenly distributed reduced strength. Wall movement was monitored and tension in the reinforcing strips measured in situ. The walls were demolished and rebuilt 8 years after construction.
1989 Pergamon Press plc. Reproduction not permitted