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Determination of retaining wall stability using the finite element method
3~A 925385 Application of the computer technique for computation of bench stability in the open pit mines constructed in a pulybed massif (In French) Zlatanov, P; Stoeva, P Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V3, P2341-2345. Publ Rotterdam: A A Balkema, 1990 Design of open pit mines in bedded strata requires careful consideration of geological and geomechanical features. An analytical procedure to evaluate stability is presented, which considers slope height and angle, bench width, and geotechnical properties. The input parameters can be varied, the most sensitive parameters established, and design optimiscd.
925386 Engiueering-geological evaluation of the rock cuts stability along the DI highway Zika, P Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V3, P2423-2427. Publ Rotterdam: A A Balkema, 1990 Cut slopes in crystalline rock (granitic and gneissic) along the DI Prague-Brno highway in Czechoslovakia have been studied. Detailed documentation of potentially unstable slopes has been carried out. Stability conditions of major cuts were analysed and potential for plane, wedge, and toppling failures assessed. An attempt is made to relate slope stability to rock quality and constructional damage.
925387 Similarity in geotechnics and calibration of models from equivalent materials Vacek, J Rock Mechanics as a Multidisciplinary Science: Proc 32nd US Symposium, Norman, 10-12 July 1991 P745-754. Publ Rotterdam: A A Balkema, 1991 The use of physical models to study the effects of mine workings is examined. Loadings on the rock mass are first considered. Geometrical similarity of the rock mass and the model and similitude of strengths of materials and calibration of models are discussed. Problems particular to underground mines, where the excavation process and its effects are difficult to incorporate, are investigated. The use of the similarity of phenomena approach for calibration in such cases is suggested.
925389 Simulation of excavation in a poro-elastic material Hsi, J P; Small, J C lnt J Num Anal Meth Geomech VI6, NI, Jan 1992, t'25-43 Excavations in soil masses are often accompanied by ground movements, the two major factors responsible for the displacements being stress relief due to overburden removal and drawdown of the phreatic surface. A method is presented for computation of displacements and pore pressures resulting from excavation in an elastic soil. The formulation is based on Biot theory and is fully coupled. It is illustrated within finite element analysis for typical problems.
925390 Rankine's analysis of active and passive pressures in dry sands Chu, S C Soils Found V31, 314, Dec 1991, PI15-120 Rankine's analysis for active and passive stresses acting on a plane in a homogeneous isotropic soil mass is applied to a slanting wall problem. Active and passive stresses are linearly distributed along the wall and active and passive thrusts act at lower one third wall height. Results are similar to those of Coulomb analysis for the active case, but Rankine thrusts are generally lower for the passive case. This is because the direction of the thrusts is not the same when using a conventionally defined friction angle.
925391 Determination of retaining wall stability using the finite element method Donald, I B; Goh, I T C Proc 6th Austra~a-New Zealand Conference on Geomechunics, Christchurch, 3-7 February 1992 P142-145. Publ New Zealand." New Zealand Geomechanics Society, 1992 Conventional stability analysis in which it is assumed that fully active conditions are mobilised behind a wall at the point of failure is compared to two finite element based methods, modified conventional analysis and the recently developed Nodal Displacement Method. The NDM can model construction and include effects of soil and wall displacements as well as stresses. The concept of the safety factor is discussed. The NDM is seen to be able to give a range of values, depending on which problem variables are considered significant.
Earth retaining structures See also: 925299
925388 Partial and total factors of safety in anchored sheet pile design Valsangkar, A J; Schriver, A B Can Geotech J 1/28, N6, Dec 1991, P812-817 Some recent research suggests the limit state design approach recommended for geotechnical design may lead to conservative design as compared to conventional design methods. A parametric study has been made of anchored sheet piles, with influences of wall geometry, type of water pressure distribution assumed, and different methods of analysis on the required depth of penetration being evaluated. Modifications are suggested to the limit state approach to make it compatible with the conventional methods.
925392 Stability of retaining walls with compacted backfills Kulathilaka, S A S; Donald, I B Proc 6th Austrah'a-New Zealand Conference on Geomechunics, Christchurch, 3-7 February 1992 P163-168. Pubi New Zealand." New Zealand Geomechanics Society. 1992 In a companion paper, Goh and Donald introduced the Nodal Displacement Method, based on the finite element method, for stability analysis of geotechnical structures. Its use is extended to retaining walls with compacted backfill by incorporation of a compaction simulation algorithm. It is demonstrated for a gravity wall. Lateral stresses at the back of the wall are different for the cases of non-compacted and compacted fill. In the latter case, safety factors against initiation of movement leading to failure rather than overall wall collapse are obtained. The effects of foundation stiffness are also evaluated.
© 1992 Pergamon Press Ltd. Reproduction not permitted
925386 Engiueering-geological evaluation of the rock cuts stability along the DI highway Zika, P Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V3, P2423-2427. Publ Rotterdam: A A Balkema, 1990 Cut slopes in crystalline rock (granitic and gneissic) along the DI Prague-Brno highway in Czechoslovakia have been studied. Detailed documentation of potentially unstable slopes has been carried out. Stability conditions of major cuts were analysed and potential for plane, wedge, and toppling failures assessed. An attempt is made to relate slope stability to rock quality and constructional damage.
925387 Similarity in geotechnics and calibration of models from equivalent materials Vacek, J Rock Mechanics as a Multidisciplinary Science: Proc 32nd US Symposium, Norman, 10-12 July 1991 P745-754. Publ Rotterdam: A A Balkema, 1991 The use of physical models to study the effects of mine workings is examined. Loadings on the rock mass are first considered. Geometrical similarity of the rock mass and the model and similitude of strengths of materials and calibration of models are discussed. Problems particular to underground mines, where the excavation process and its effects are difficult to incorporate, are investigated. The use of the similarity of phenomena approach for calibration in such cases is suggested.
925389 Simulation of excavation in a poro-elastic material Hsi, J P; Small, J C lnt J Num Anal Meth Geomech VI6, NI, Jan 1992, t'25-43 Excavations in soil masses are often accompanied by ground movements, the two major factors responsible for the displacements being stress relief due to overburden removal and drawdown of the phreatic surface. A method is presented for computation of displacements and pore pressures resulting from excavation in an elastic soil. The formulation is based on Biot theory and is fully coupled. It is illustrated within finite element analysis for typical problems.
925390 Rankine's analysis of active and passive pressures in dry sands Chu, S C Soils Found V31, 314, Dec 1991, PI15-120 Rankine's analysis for active and passive stresses acting on a plane in a homogeneous isotropic soil mass is applied to a slanting wall problem. Active and passive stresses are linearly distributed along the wall and active and passive thrusts act at lower one third wall height. Results are similar to those of Coulomb analysis for the active case, but Rankine thrusts are generally lower for the passive case. This is because the direction of the thrusts is not the same when using a conventionally defined friction angle.
925391 Determination of retaining wall stability using the finite element method Donald, I B; Goh, I T C Proc 6th Austra~a-New Zealand Conference on Geomechunics, Christchurch, 3-7 February 1992 P142-145. Publ New Zealand." New Zealand Geomechanics Society, 1992 Conventional stability analysis in which it is assumed that fully active conditions are mobilised behind a wall at the point of failure is compared to two finite element based methods, modified conventional analysis and the recently developed Nodal Displacement Method. The NDM can model construction and include effects of soil and wall displacements as well as stresses. The concept of the safety factor is discussed. The NDM is seen to be able to give a range of values, depending on which problem variables are considered significant.
Earth retaining structures See also: 925299
925388 Partial and total factors of safety in anchored sheet pile design Valsangkar, A J; Schriver, A B Can Geotech J 1/28, N6, Dec 1991, P812-817 Some recent research suggests the limit state design approach recommended for geotechnical design may lead to conservative design as compared to conventional design methods. A parametric study has been made of anchored sheet piles, with influences of wall geometry, type of water pressure distribution assumed, and different methods of analysis on the required depth of penetration being evaluated. Modifications are suggested to the limit state approach to make it compatible with the conventional methods.
925392 Stability of retaining walls with compacted backfills Kulathilaka, S A S; Donald, I B Proc 6th Austrah'a-New Zealand Conference on Geomechunics, Christchurch, 3-7 February 1992 P163-168. Pubi New Zealand." New Zealand Geomechanics Society. 1992 In a companion paper, Goh and Donald introduced the Nodal Displacement Method, based on the finite element method, for stability analysis of geotechnical structures. Its use is extended to retaining walls with compacted backfill by incorporation of a compaction simulation algorithm. It is demonstrated for a gravity wall. Lateral stresses at the back of the wall are different for the cases of non-compacted and compacted fill. In the latter case, safety factors against initiation of movement leading to failure rather than overall wall collapse are obtained. The effects of foundation stiffness are also evaluated.
© 1992 Pergamon Press Ltd. Reproduction not permitted