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Probabilistic approach to the stability of rock slopes
192A to estimate probability of rotational failure is proposed. It is demonstrated applied to the case of kaolinised granite china clay deposits in Cornwall, UK. 9334O8 Slope stability of Ssnagyong limestone quarry in Korea Lee, C I; Seo, Y H; Chang, K M Proc 7th ISRM International Congress on Rock Meelumics, Aachen, 16-20 September 1991 V2, P913-916. Publ Rotterdam: A A Balkema, 1991 The Ssangyong pit is the largest open pit mine in Korea. Benches in one area have shown stability problems. Orientations of discontinuities in areas of interest have been mapped and stereographic projection and block theory used to delineate potentially unstable blocks. Key blocks were identified and the maximum safe slope angle determined from examination of the number of key blocks at various slope angles. Kinematic analysis was also carried out and the results are compared. Optimum orientation of the faces to improve stability is evaluated. 933409 Probabilistic approach to the stabifity of rock slopes Muralha, J Proc 7th ISRM International Congress on Rock Mechanics, Aachen, 16-20 September 1991 V2, P921-927. Publ Rotterdam: A A Baikema, 1991 Probabilistic analysis of rock slopes considering plane and wedge failures is discussed. It is necessary to consider statistical variation in the position of the plane or wedge, orientation, area, and intensity of joint sets, and joint set shear strength and size effects. Two examples of plane shear failure and one of wedge failure are presented, with the emphasis on establishing qualitative and relative comparisons between features which influence the stability of rock slopes. 933410 Probabilistic slope stability ns~mmeot using Latin Hypereabe Sampling Nathauail, C P; Rosenbaum, M S Proc 7tk INRM International Congress on Rock Meclumics, Aachen, 16-20 September 1991 V2, P929-934. Publ Rotterdam: A .4 Balkema, 1991 Probabilistic approaches to slope stability analysis allow the observed natural variations of many features to be taken into consideration. Many such analyses have been carried out using the Monte Carlo Sampling approach to select samples from a probability distribution function. Analyses of plane and wedge failures of rock slopes are presented in which both Monte Carlo and Latin Hypercube sampling methods were used. Analysis of results shows the latter represents the original more closely for sample sets of the same size, and its adoption will result in lowering of required computation time. 933411 Slope stability investigations in a dragline panel Ozgenoglu, A; Pasamehmetogiu, A G Proe 7tiJ ISRM Imtermltiomd Comgress on Rock Meckuics, Aachen, 16-20 September 1991 V2, P935-938. Publ Rotterdam: A A Balkema, 1991 It is planned to strip the overburden at an open east lignite mine in Turkey using a 50 cubic m dragiine. The stability of the digging face, old and new highwalls, and spoil heaps is an important factor for safe and efficient operation. Field investigation of the blasted overburden was carried out to establish geotechnical and geological parameters for slope analysis. Results of slope analyses are presented and recommended factors of safety and slope angles discussed.
933412 Topological slope stability analysis using stochastic frneture geometry model Einstein, H H; Lee, J S Proc Conference on Fractured and Jointed Rock Masses, Lake Tahoe, 3-5 June 1992 P96-106. Publ California: Lawrence Berkeley Laboratory, 1992 A combination of the stochastic hierarchical model of Lee et al (1990) for fracture geometry and the topological approach is presented for stability analysis of rock slopes. The first step is geometric construction of the fracture pattern. Kinematic updating is used to identify the kinematically admissible blocks from amongst those which are geometrically admissible. Kinetic or mechanical analysis is used to determine the kinetic stability of the kinematically admissible blocks. Slope stability is expressed in terms of probability of failure. Application to parametric studies is presented. 933413 Ganssian quadrature numerical integration scheme applied to slope stability analysis Matin, H E; Sharp, K D; Anderson, L R Proc 28th Symposium on EsmgimeeriagGeology and Geoteelmical Engineeriq, Boise, 1-3 April 1992 P193-202. Publ Pocatello: Idaho State University, 1992 The limit equilibrium-method of slices approach based on the trapezoidal rule (dividing the failure mass into slices of equal width) is widely applied to slope stability problems. An alternative, higher order procedure, the Gauss-Legendre quadrature, is proposed as an improvement. In this, the failure surface is divided into segments based on changes in geometry or changes in soil type along a given failure surface. Despite the simplifying assumptions made in this method, better and more efficient solutions for slope stability analysis are obtained. 933414 Stability of alnmdoned mine land reint~l slopes Karfakis, M G; Goldberg, A D; Hendrick, R M Proc 28th Symposium on ~ e r i n g Geology a~l Geoteelmical EngiMeriq, Boise, 1-3 April 1992 P219-225. Publ Pocatello: Idaho State University, 1992 Failures of slopes of heaped overburden material are common in the mining areas of the Appalachian plateau. Data have been collected from southwest Virginia, characterising the different constructions of waste embankments for pre-1977 mining practices. Factors affecting stability and failure mechanisms are analysed. Current practices for dealing with these abandoned spoil slopes and the effectiveness of these remedial measures are discussed. 933415 Location of critical slip sm'faees in coal mine spoil piles Williams, D J; Zou, J Z Proc 6th Australia-New Zealand Conference on Geomedumics, Ci~istcimwck, 3-7 Febnuwy 1992 P468-473. Publ New Zealand: New Zealand Geomechanics Society, 1992 Because of their method of construction and the possibility of water softened material at the base, coal spoil heaps are at considerable risk of instability. The stresses within a spoil heap of particular geometry have been evaluated using a stochastic finite element method, which allows for observed variations in spoil mechanical properties. Sensitivity to basal conditions is demonstrated. The critical slip sitrface is located using an improved dynamic programming method and minimum factor of safety obtained. Results are compared to those of a generalised limit equilibrium wedge analysis, which employs a pattern search optimisation procedure.
© 1993 Pergamon Press Ltd. Reproduction not permitted
933412 Topological slope stability analysis using stochastic frneture geometry model Einstein, H H; Lee, J S Proc Conference on Fractured and Jointed Rock Masses, Lake Tahoe, 3-5 June 1992 P96-106. Publ California: Lawrence Berkeley Laboratory, 1992 A combination of the stochastic hierarchical model of Lee et al (1990) for fracture geometry and the topological approach is presented for stability analysis of rock slopes. The first step is geometric construction of the fracture pattern. Kinematic updating is used to identify the kinematically admissible blocks from amongst those which are geometrically admissible. Kinetic or mechanical analysis is used to determine the kinetic stability of the kinematically admissible blocks. Slope stability is expressed in terms of probability of failure. Application to parametric studies is presented. 933413 Ganssian quadrature numerical integration scheme applied to slope stability analysis Matin, H E; Sharp, K D; Anderson, L R Proc 28th Symposium on EsmgimeeriagGeology and Geoteelmical Engineeriq, Boise, 1-3 April 1992 P193-202. Publ Pocatello: Idaho State University, 1992 The limit equilibrium-method of slices approach based on the trapezoidal rule (dividing the failure mass into slices of equal width) is widely applied to slope stability problems. An alternative, higher order procedure, the Gauss-Legendre quadrature, is proposed as an improvement. In this, the failure surface is divided into segments based on changes in geometry or changes in soil type along a given failure surface. Despite the simplifying assumptions made in this method, better and more efficient solutions for slope stability analysis are obtained. 933414 Stability of alnmdoned mine land reint~l slopes Karfakis, M G; Goldberg, A D; Hendrick, R M Proc 28th Symposium on ~ e r i n g Geology a~l Geoteelmical EngiMeriq, Boise, 1-3 April 1992 P219-225. Publ Pocatello: Idaho State University, 1992 Failures of slopes of heaped overburden material are common in the mining areas of the Appalachian plateau. Data have been collected from southwest Virginia, characterising the different constructions of waste embankments for pre-1977 mining practices. Factors affecting stability and failure mechanisms are analysed. Current practices for dealing with these abandoned spoil slopes and the effectiveness of these remedial measures are discussed. 933415 Location of critical slip sm'faees in coal mine spoil piles Williams, D J; Zou, J Z Proc 6th Australia-New Zealand Conference on Geomedumics, Ci~istcimwck, 3-7 Febnuwy 1992 P468-473. Publ New Zealand: New Zealand Geomechanics Society, 1992 Because of their method of construction and the possibility of water softened material at the base, coal spoil heaps are at considerable risk of instability. The stresses within a spoil heap of particular geometry have been evaluated using a stochastic finite element method, which allows for observed variations in spoil mechanical properties. Sensitivity to basal conditions is demonstrated. The critical slip sitrface is located using an improved dynamic programming method and minimum factor of safety obtained. Results are compared to those of a generalised limit equilibrium wedge analysis, which employs a pattern search optimisation procedure.
© 1993 Pergamon Press Ltd. Reproduction not permitted