- Email: [email protected]
Two new specialty geotechnical processes for slope stabilization
108A 942374 Correlations among geomechanical characteristics, fracturation degree and stability of rock slopes Barisone. G; Bottino, G; Mandrone, G Proc 6th International Symposium on Landslides, Christchurch, 10-14 February 1992 V1, P315-320. Publ Rotterdam. A A Balkema, 1992 The work described is concentrated on four sites in two of the main valleys in the Western Alps, examining steep slopes which are lithologically different but tectonically and morphologically homogeneous. Lithology (always outcropping metamorphic), geomechanical parameters, and discontinuity properties and geometry were recorded. Statistical methods and comparative analysis were used to establish correlations to better define areas prone to landslides or rock falls. 942375 Reliability-based analysis of embankment failures on soft ground Bergado, D T; Alfaro, M C; Patron, B C; Chirapuntu, S Proc 6th International Symposium on Landslides, Christchurch, 10-14 February 1992 V1, P321-328. Publ Rotterdam: A A Balkema, 1992 Both conventional and reliability-based analyses have been applied to 6 randomly occurring failures along a 10km road embankment adjacent to an irrigation canal. Deterministic analysis based on soil mean undrained shear strength and assuming constant embankment geometry did not reproduce the observed failure pattern. Probabilistic approaches considering spatial variation of soil shear strength and changing water levels in the canal indicated higher probability of failure in the failure sections. Reliability-based analysis in terms of probability of failure gave results corresponding to the actual failure pattern. 942376 Application of Voight empirical model for the prediction of soil and rock instabilities Borsetto, M; Frassoni, A; La Barbera, G; Fanelli, M; Giuseppetti, G; Mazza, G Proc 6th International Symposium on Landslides, Christchurch, 10-14 February 1992 V1, P335-341. Publ Rotterdam: A A Balkema, 1992 Following a major slide in the Adda River Valley of the Italian Alps in 1987, instrumentation was installed to provide warning of future instabilities. Conventional mathematical analyses are not generally able to predict development of unstable areas. The application to the monitored data of the empirical material failure criterion of Voight (1989) has however shown promise for safety evaluation of unstable masses characterised by progressively increasing displacement velocity. Future research in the topic is suggested. 942377 Displacement prediction using rate effects on residual shear strength Bracegirdle, A; Vaughan, P R; Hight, D W Proc 6th International Symposium on Landslides, Christchurch, 10-14 February 1992 V1, P343-347. Publ Rotterdam: A A Balkema, 1992 Many landslides move irregularly in response to discrete triggers. Over long periods, slip displacement becomes a function of frequency and duration of the triggers and the relation between shear strength and shear rate. If rate effects can be measured or derived, it is possible to predict future movements. A case example of the banks of the River Tyne is
presented. Bedrock is overlain by lodgement till, laminated clay, and recent deposits of sand and silt. Slip movements in this case are shown to be triggered by extreme low tides. 942378 Appropriate model for hazard analysis in slope engineering Chen, H Proc 6th International Symposium on Landslides, Christchurch, 10-14 February 1992 II1, P349-354. Publ Rotterdam: A A Balkema, 1992 A number of building developments have been started on unstable slopes in the Hsin-Hain region of Taipei, and slope failures occurred soon after work began. Initial (Bishop simplified) slope analysis using a pseudo-circular failure model indicated stability. Further investigation revealed that initial assumptions regarding stratigraphy, lithology, structural geology and groundwater conditions were inaccurate. Analysis for planar failure gave a safety factor of 0.97, compared to initial estimate of 1.15. The importance of adequate site investigation and selection of the correct analysis method is emphasised. 942379 Deformation starting criterion of sliding-heading model in dip slope Chen Mingdon; Wang Lansheng; Li Tianbin Proc 6th International Symposium on Landslides, Christchurch, 10-14 February 1992 111, P355-360. Publ Rotterdam." A A Balkema, 1992 Landslides with buckling deformation are common in steep slopes with slope-parallel bedding. This mechanism has been examined theoretically using a model of bending of multiple beams. Critical stress for bending has been determined. A stability criterion has been developed for bedded rock slopes, taking account of bed thickness, strata dip and slope length. It is demonstrated applied to several slopes along the Yangtze river. 942380 Probabilistic analysis of slope stability in rocks Cherubini, C; Giasi, C I; Cucchiararo, L Proc 6th International Symposimn on 1amdslides, Christchurch, 10-14 February 1992 V1, P361-366. Publ Rotterdam: A A Balkema, 1992 Stability of a rock slope is analysed as a function of variability of strength parameters. Probabilistic level II methods were first applied with cohesion and friction angle assumed initially to be uncorrelated then correlated by means of different correlation coefficients. Safety factor variability was examined. These results are compared to those from Monte Carlo simulations, in which the variables are taken to be normally distributed and variously correlated to each other. 942381 Two new specialty geotechnical processes for slope stabilization Bruce, D A Proc Conference Stability and Performance o f Slopes and Embankments !I, Berkeley, 29 June-I July 1992 II2, P15051519. Publ New York: ASCE, 1992 ( A S C E Special Geotechnical Publication No 31) Two recently developed methods for slope stabilisation are presented. The first involves installation of an array of inserts (grouted pin piles) to form a vertical wall or a shield around an underground structure. The second is the RODREN drainage system where a series of large diameter wells are connected near their bases by horizontal pipes such that gravity flow conducts the water to a convenient discharge or pumping location. Construction details are given for both methods.
presented. Bedrock is overlain by lodgement till, laminated clay, and recent deposits of sand and silt. Slip movements in this case are shown to be triggered by extreme low tides. 942378 Appropriate model for hazard analysis in slope engineering Chen, H Proc 6th International Symposium on Landslides, Christchurch, 10-14 February 1992 II1, P349-354. Publ Rotterdam: A A Balkema, 1992 A number of building developments have been started on unstable slopes in the Hsin-Hain region of Taipei, and slope failures occurred soon after work began. Initial (Bishop simplified) slope analysis using a pseudo-circular failure model indicated stability. Further investigation revealed that initial assumptions regarding stratigraphy, lithology, structural geology and groundwater conditions were inaccurate. Analysis for planar failure gave a safety factor of 0.97, compared to initial estimate of 1.15. The importance of adequate site investigation and selection of the correct analysis method is emphasised. 942379 Deformation starting criterion of sliding-heading model in dip slope Chen Mingdon; Wang Lansheng; Li Tianbin Proc 6th International Symposium on Landslides, Christchurch, 10-14 February 1992 111, P355-360. Publ Rotterdam." A A Balkema, 1992 Landslides with buckling deformation are common in steep slopes with slope-parallel bedding. This mechanism has been examined theoretically using a model of bending of multiple beams. Critical stress for bending has been determined. A stability criterion has been developed for bedded rock slopes, taking account of bed thickness, strata dip and slope length. It is demonstrated applied to several slopes along the Yangtze river. 942380 Probabilistic analysis of slope stability in rocks Cherubini, C; Giasi, C I; Cucchiararo, L Proc 6th International Symposimn on 1amdslides, Christchurch, 10-14 February 1992 V1, P361-366. Publ Rotterdam: A A Balkema, 1992 Stability of a rock slope is analysed as a function of variability of strength parameters. Probabilistic level II methods were first applied with cohesion and friction angle assumed initially to be uncorrelated then correlated by means of different correlation coefficients. Safety factor variability was examined. These results are compared to those from Monte Carlo simulations, in which the variables are taken to be normally distributed and variously correlated to each other. 942381 Two new specialty geotechnical processes for slope stabilization Bruce, D A Proc Conference Stability and Performance o f Slopes and Embankments !I, Berkeley, 29 June-I July 1992 II2, P15051519. Publ New York: ASCE, 1992 ( A S C E Special Geotechnical Publication No 31) Two recently developed methods for slope stabilisation are presented. The first involves installation of an array of inserts (grouted pin piles) to form a vertical wall or a shield around an underground structure. The second is the RODREN drainage system where a series of large diameter wells are connected near their bases by horizontal pipes such that gravity flow conducts the water to a convenient discharge or pumping location. Construction details are given for both methods.