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Case examples of stability on surface mining projects
94A 882334 Stability evaluation of some urban rock slopes in a transient groundwater regime Richards, L R; Cowland, J W In: Rock Engineering and Excaation in an Urban Encironmeat (papers to the conference,Hong Kong, 24-27 February, 1986) P357-363. Publ London: IMM, 1986
882338 Wave-induced ~ of ~ infinite slopes: a probabilistic analysis Rahman, M S; Jaber, W Y Proc Sixti~ (1987) International Mockanics and Arctic Engineering S y m p o ~ , Homston, i ~ Mwck 1987 V1, P411416. Publ New York: ASME, 1987
The stability of a number of excavated slopes in jointed granite in Hong Kong was studied. Field and laboratory investigations are described. Failure mechanisms and stability conditions were determined. The stability of one slope was found to be particularly sensitive to groundwater conditions. A piezometric study provided useful information about transient groundwater rises along continuous joints during tropical rainfall, and showed that joint water pressure distributions are significantly different from those normally assumed.
Gravity induced shear stresses and pressure associated with propagating water waves may cause shear failure o f soft clay sedimems on sea bed slopes and lead to :marine landslides. A procedure to evaluate the probability of failure and to identify potentially unstable slopes is presented: Numerical results :of analyses of case studies are also shown:
882335 Rock slope study and stabilization in Pittsburg, Pennsylvania: a case history Speck, R C; Bruhn, R W In: Rock Engineering and Excavation in an Urban Environment (papers to the conference, Hong Kong, 24-27 February, 1986) P381-396. Publ London: IMM, 1986 A major rockfail occurred in 1978 on Duquesne Bluff, a series of nearly flat sedimentary rock units, containing tectonically induced joints, stress relief joints, and joints formed by wetdry, freeze-thaw cycles. Four primary failure mechanisms were identified, falling, toppling, sliding, and degradation. The slope was subdivided into zones based on the consideration of potential of a particular mode of failure, consequence of failure. and most promising correction method. No single remedial measure was appropriate, and procedures used included construction of a concrete band to retard weathering of a soft rock stratum, rock trimming, and bolts and wire mesh. 882336 Development of a new approach to slope stability ass~sment in UK surface coal mines Singh, R N; Brown, D J; Denby, B; Croghan, J A In: Ground Mooement and Control Related to Coal Mining (papers to the Symposium, lllawarra, August 1986) P57-63. Publ Parkville: AusIMM. 1986 An instability database of 26 variables relating site, geology, geometry, conditions, history, and excavation method has been assembled from records of past slope stability problems in UK open pit coal mines. The database is used to assess slope stability using the concept of a stability index which relates to the probability of failure of a slope. This index is incorporated in a new mine design system, which enables stability contoured mine planes to be produced using standard exploration information. 882337 Case examples of stability on surface mining projects Brawner, C O In: Ground Movement and Control Related to Coal MiMng (papers to the Symposium, lilatcarra, August 1986) P64-73. Publ Parkville: AuslMM. 1986 Five primary factors control slope stability in surface mining. These are structural geology, the most important factor, the existence of weak layers, usually clayey gouge or clay infill, groundwater, blasting, and weathering. Case histories of many slope failures caused by these factors are presented and methods of mitigating problems and assessing stability discussed.
882339 Perspective on landslide dams Schuster, R L; Costa, J E In: Landslide Dams: Processes Risk and Mitigation (papers to the conference, Seattle, 7 April 1~6) Pl-20. Publ New York: ASCE, 1986 ( ASCE Geotectmicat Special Publication No 3) The types of mass movement causing landslide dams, rock and soil slumps and slides, solifluction, and rock a n d debris avalanches, failure initiation, geographic settings, and failure modes, failure causes and longevity of iand$1ide dams are reviewed: This phenomenon is iittle studied, and areas where further work is warranted are outlined.
88234O 1983 landslide dam at Thistle, Utah Kaliser, B N; Fleming, R W In: LatutMide Dams: Processes Risk and Mitigation (papers to the conference, Seattle, 7 April 1 9 ~ ) P59,83. Publ New York: ASCE, 1986 (ASCE Geotechnical Special Publication No 3) A landslide, reactivation of old landslide debris, caused a 50m deep lake,which has subsequently been drained. The slide moved over 150m on a slope of about 10 deg. Post disaster investigation revealed a moderately plastic gravelly clay sliding on a trough shaped depression in-bedrock. Extremely high precipitation is thought to be the triggering factor. Movement has nearly stopped, but high pore pressures and lateral stresses still exist. The event, history of movement at the site, geological conditions, and the current state of the slide are exaimined.
882341 Geomechanics for slope design at Chuquicamata Mine, Chile Manuel, R C; Guillermo, K L Proc lat~natimml Sympmiam on F:qb~eriq in Complex Rock F~nmtions, Beijhtg, 3-7 Noeemher, 1986 P399.407. Publ Beijing: Science Press, 1986 The geomechanics program at this large open pit copper mine from 1968 to the present is described. Adatabase o f Chuquicamata rocks has been established, 2- and 3-dimensional finite element algorithms have been developed for slope analysis, RQD based geostatistics have been employed, and in situ monitoring of natural and mining s t r ~ s and vibrations has been employed. This Program has allowed ex~vation to proceed without major hindrance. Methods u_~d in slope design are described with emphasis on control of critical slope sections on the mine perimeter.
© 1988 Pergamon Press plc. Reproduction not permitted
882338 Wave-induced ~ of ~ infinite slopes: a probabilistic analysis Rahman, M S; Jaber, W Y Proc Sixti~ (1987) International Mockanics and Arctic Engineering S y m p o ~ , Homston, i ~ Mwck 1987 V1, P411416. Publ New York: ASME, 1987
The stability of a number of excavated slopes in jointed granite in Hong Kong was studied. Field and laboratory investigations are described. Failure mechanisms and stability conditions were determined. The stability of one slope was found to be particularly sensitive to groundwater conditions. A piezometric study provided useful information about transient groundwater rises along continuous joints during tropical rainfall, and showed that joint water pressure distributions are significantly different from those normally assumed.
Gravity induced shear stresses and pressure associated with propagating water waves may cause shear failure o f soft clay sedimems on sea bed slopes and lead to :marine landslides. A procedure to evaluate the probability of failure and to identify potentially unstable slopes is presented: Numerical results :of analyses of case studies are also shown:
882335 Rock slope study and stabilization in Pittsburg, Pennsylvania: a case history Speck, R C; Bruhn, R W In: Rock Engineering and Excavation in an Urban Environment (papers to the conference, Hong Kong, 24-27 February, 1986) P381-396. Publ London: IMM, 1986 A major rockfail occurred in 1978 on Duquesne Bluff, a series of nearly flat sedimentary rock units, containing tectonically induced joints, stress relief joints, and joints formed by wetdry, freeze-thaw cycles. Four primary failure mechanisms were identified, falling, toppling, sliding, and degradation. The slope was subdivided into zones based on the consideration of potential of a particular mode of failure, consequence of failure. and most promising correction method. No single remedial measure was appropriate, and procedures used included construction of a concrete band to retard weathering of a soft rock stratum, rock trimming, and bolts and wire mesh. 882336 Development of a new approach to slope stability ass~sment in UK surface coal mines Singh, R N; Brown, D J; Denby, B; Croghan, J A In: Ground Mooement and Control Related to Coal Mining (papers to the Symposium, lllawarra, August 1986) P57-63. Publ Parkville: AusIMM. 1986 An instability database of 26 variables relating site, geology, geometry, conditions, history, and excavation method has been assembled from records of past slope stability problems in UK open pit coal mines. The database is used to assess slope stability using the concept of a stability index which relates to the probability of failure of a slope. This index is incorporated in a new mine design system, which enables stability contoured mine planes to be produced using standard exploration information. 882337 Case examples of stability on surface mining projects Brawner, C O In: Ground Movement and Control Related to Coal MiMng (papers to the Symposium, lilatcarra, August 1986) P64-73. Publ Parkville: AuslMM. 1986 Five primary factors control slope stability in surface mining. These are structural geology, the most important factor, the existence of weak layers, usually clayey gouge or clay infill, groundwater, blasting, and weathering. Case histories of many slope failures caused by these factors are presented and methods of mitigating problems and assessing stability discussed.
882339 Perspective on landslide dams Schuster, R L; Costa, J E In: Landslide Dams: Processes Risk and Mitigation (papers to the conference, Seattle, 7 April 1~6) Pl-20. Publ New York: ASCE, 1986 ( ASCE Geotectmicat Special Publication No 3) The types of mass movement causing landslide dams, rock and soil slumps and slides, solifluction, and rock a n d debris avalanches, failure initiation, geographic settings, and failure modes, failure causes and longevity of iand$1ide dams are reviewed: This phenomenon is iittle studied, and areas where further work is warranted are outlined.
88234O 1983 landslide dam at Thistle, Utah Kaliser, B N; Fleming, R W In: LatutMide Dams: Processes Risk and Mitigation (papers to the conference, Seattle, 7 April 1 9 ~ ) P59,83. Publ New York: ASCE, 1986 (ASCE Geotechnical Special Publication No 3) A landslide, reactivation of old landslide debris, caused a 50m deep lake,which has subsequently been drained. The slide moved over 150m on a slope of about 10 deg. Post disaster investigation revealed a moderately plastic gravelly clay sliding on a trough shaped depression in-bedrock. Extremely high precipitation is thought to be the triggering factor. Movement has nearly stopped, but high pore pressures and lateral stresses still exist. The event, history of movement at the site, geological conditions, and the current state of the slide are exaimined.
882341 Geomechanics for slope design at Chuquicamata Mine, Chile Manuel, R C; Guillermo, K L Proc lat~natimml Sympmiam on F:qb~eriq in Complex Rock F~nmtions, Beijhtg, 3-7 Noeemher, 1986 P399.407. Publ Beijing: Science Press, 1986 The geomechanics program at this large open pit copper mine from 1968 to the present is described. Adatabase o f Chuquicamata rocks has been established, 2- and 3-dimensional finite element algorithms have been developed for slope analysis, RQD based geostatistics have been employed, and in situ monitoring of natural and mining s t r ~ s and vibrations has been employed. This Program has allowed ex~vation to proceed without major hindrance. Methods u_~d in slope design are described with emphasis on control of critical slope sections on the mine perimeter.
© 1988 Pergamon Press plc. Reproduction not permitted