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Chase — Case history for cut slope failures
211A 894335 Rhythmical patterns of roekfall evolution in NNW Bohemia Zvelebil, J Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P803-809. Publ Rotterdam: A A Balkema, 1988
Major rockfalls occur every 3-4 years in the 40-100m high walls of the Labe River Canyon. The subhorizontally deposited sandstone rock is characterised by vertical fissures originating from the upper surface. Long term monitoring of slope block movement was carried out. Diurnal temperature effects and tidal gravitational effects were distinguishable. This data and historical data have been used to predict periods of maximum rockfall data. A mechanism for the development of the unstable condition of the rock mass, which includes weathering effects, is proposed. 894336 Lessons from slope failures Lambe, T W Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 VI, PI-22, Publ Bangkok: Southeast Asian Geotechnical SocieO' A review of stability analysis. The stress path method, which requires data on geometry, strength and pore water pressure, and the expression of the level of stability are discussed, highlighting common sources of error. 894337 Stability of an unloaded slope Lambe, T W; Silva, F; Lambe, P C Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 VI, PI.I-I.16. Publ Bangkok: Southeast Asian Geotechnical Society The stability of a slope of compacted, fine-grained soil subjected to an increase in pore water pressure is considered. A safety assessment of the FORS-1 dam is presented, and results used to examine some geotechnical fundamentals employed, such as geometry and pore water pressure. The safety assessment uses increasingly sophisticated analyses (preliminary, approximate and refined) and stress paths. 894338 Geology and mechanics in slope instabilities Duffaut, P Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 VI, P1.17-1.24. Publ Bangkok: Southeast Asian Geotechnical Society
The contribution of geology to the understanding of the mechanics of slope stability is considered by comparison with dam stability, as all slopes are seen as dams against groundwater. Contrasts between the geological and theoretical media are made by analysing heterogeneity, anisotropy, curvature of slope contour and transient flow. 894339 Landslide problems and their control in Singapore Tan, S B; Tan, S L; Lim, T L; Yang, K S Proc Ninth Southeast Asian Geotechnicai Conference, Bangkok, 7-11 December 1987 VI, PI.25-1.36. Publ Bangkok: Southeast Asian Geotechnical Society
Slope stability in Singapore, particularly the importance of rainfall, is discussed. Most landslides are induced by heavy rainfall and tend to occur on man-made slopes in heavily weathered residual soils, colluvial deposits and compacted fills. Examples of remedial measures, including regrading
slopes, retaining walls, surface and subsoil drainage, ground anchors, soil nails, tied-back walls, contiguous bored-pile walls and geogrids, are presented. 89434O Cause of landslides in clayey region Hirata, T; Chishaki, T; Kadivar, M H; Izawa, S Proc Ninth Southeast Asian Geoteclmieal Conference, Bangkok, 7-11 December 1987 VI, P1.37-1.44. Publ Bangkok: Southeast Asian Geotechnical Society The relation between the mechanical properties of clay and landslide occurrence in Hokusho, Japan, was studied to determine causes of the landslides. As the slides occur mainly in the rainy season, the effect of rainfall on shear strength, displacement and shear force was considered. The swelling pressure was studied and the possibility of creep tested using direct shear tests. Results show that rainfall has little effect on the saturated clay, and that the main causes of the landslides are decreased shear strength of the clay surface layer due to wetting, swelling pressure and creep deformation. 894341 Caisson for slope stabilization Guo, W S; Wong, L W; Hsiung, K ! Proc Ninth Southeast Asian Geotechnicai Conference, Bangkok, 7-11 December 1987 VI, PI.45-1.56. Publ Bangkok." Southeast Asian Geotechnical Society Site investigation and monitoring of a slope failure in Taiwan was undertaken. Initial investigation was by engineering geology mapping, seismic refraction, and drilling and instrumentation. The engineering properties of the 3 materials making up the slope, colluvium, weathered shale and bedrock, were determined. Piezometers and inclinometers were installed, showing different piezometric heads existed in the colluvium and the rock strata, and that the sliding surface coincided with the base of the colluvium. Janbu's method was used for stability analysis. Stabilisation using a caisson wall scheme has been successful. 894342 Structural behaviour of Crocker Formation and its implication to landslides Gasim, M B; Brunotte, D A Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 VI, PI.57-1.68. Publ Bangkok: Southeast Asian Geotechnical Society Aerial photographs were used to study the occurrence of landslides and showed zones of weakness as lineaments. The major lineaments may be interpreted as normal or strike-slip faults. Six locations were studied in more detail, showing the structural geology to be complex with frequent landslides. The failures are divided into 3 categories: (I) due to shearing; (2) due to discontinuities, fractures or faults creating spaces within the rock; and (3) groundwater effects resulting in seepage. 894343 Chase - case history for cut slope failures Yamada, M; Inada, M; Akaishi, M; Tonosaki, A Proc Ninth Southeast Asian Geotechnicai Conference, Bangkok, 7-11 December 1987 VI, PI.69-1.78. Publ Bangkok: Southeast Asian Geotechnical Society Failure of a cut slope following a typhoon has been investigated. The groundwater level and rain from the typhoon are considered. Stability analysis was undertaken using total stress and effective stress approaches. Laboratory tests on samples of the gravelly clay were performed to determine cohesion, angle of shearing resistance and strength parameters.
1989 Pergamon Press plc. Reproduction not permitted
Major rockfalls occur every 3-4 years in the 40-100m high walls of the Labe River Canyon. The subhorizontally deposited sandstone rock is characterised by vertical fissures originating from the upper surface. Long term monitoring of slope block movement was carried out. Diurnal temperature effects and tidal gravitational effects were distinguishable. This data and historical data have been used to predict periods of maximum rockfall data. A mechanism for the development of the unstable condition of the rock mass, which includes weathering effects, is proposed. 894336 Lessons from slope failures Lambe, T W Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 VI, PI-22, Publ Bangkok: Southeast Asian Geotechnical SocieO' A review of stability analysis. The stress path method, which requires data on geometry, strength and pore water pressure, and the expression of the level of stability are discussed, highlighting common sources of error. 894337 Stability of an unloaded slope Lambe, T W; Silva, F; Lambe, P C Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 VI, PI.I-I.16. Publ Bangkok: Southeast Asian Geotechnical Society The stability of a slope of compacted, fine-grained soil subjected to an increase in pore water pressure is considered. A safety assessment of the FORS-1 dam is presented, and results used to examine some geotechnical fundamentals employed, such as geometry and pore water pressure. The safety assessment uses increasingly sophisticated analyses (preliminary, approximate and refined) and stress paths. 894338 Geology and mechanics in slope instabilities Duffaut, P Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 VI, P1.17-1.24. Publ Bangkok: Southeast Asian Geotechnical Society
The contribution of geology to the understanding of the mechanics of slope stability is considered by comparison with dam stability, as all slopes are seen as dams against groundwater. Contrasts between the geological and theoretical media are made by analysing heterogeneity, anisotropy, curvature of slope contour and transient flow. 894339 Landslide problems and their control in Singapore Tan, S B; Tan, S L; Lim, T L; Yang, K S Proc Ninth Southeast Asian Geotechnicai Conference, Bangkok, 7-11 December 1987 VI, PI.25-1.36. Publ Bangkok: Southeast Asian Geotechnical Society
Slope stability in Singapore, particularly the importance of rainfall, is discussed. Most landslides are induced by heavy rainfall and tend to occur on man-made slopes in heavily weathered residual soils, colluvial deposits and compacted fills. Examples of remedial measures, including regrading
slopes, retaining walls, surface and subsoil drainage, ground anchors, soil nails, tied-back walls, contiguous bored-pile walls and geogrids, are presented. 89434O Cause of landslides in clayey region Hirata, T; Chishaki, T; Kadivar, M H; Izawa, S Proc Ninth Southeast Asian Geoteclmieal Conference, Bangkok, 7-11 December 1987 VI, P1.37-1.44. Publ Bangkok: Southeast Asian Geotechnical Society The relation between the mechanical properties of clay and landslide occurrence in Hokusho, Japan, was studied to determine causes of the landslides. As the slides occur mainly in the rainy season, the effect of rainfall on shear strength, displacement and shear force was considered. The swelling pressure was studied and the possibility of creep tested using direct shear tests. Results show that rainfall has little effect on the saturated clay, and that the main causes of the landslides are decreased shear strength of the clay surface layer due to wetting, swelling pressure and creep deformation. 894341 Caisson for slope stabilization Guo, W S; Wong, L W; Hsiung, K ! Proc Ninth Southeast Asian Geotechnicai Conference, Bangkok, 7-11 December 1987 VI, PI.45-1.56. Publ Bangkok." Southeast Asian Geotechnical Society Site investigation and monitoring of a slope failure in Taiwan was undertaken. Initial investigation was by engineering geology mapping, seismic refraction, and drilling and instrumentation. The engineering properties of the 3 materials making up the slope, colluvium, weathered shale and bedrock, were determined. Piezometers and inclinometers were installed, showing different piezometric heads existed in the colluvium and the rock strata, and that the sliding surface coincided with the base of the colluvium. Janbu's method was used for stability analysis. Stabilisation using a caisson wall scheme has been successful. 894342 Structural behaviour of Crocker Formation and its implication to landslides Gasim, M B; Brunotte, D A Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 VI, PI.57-1.68. Publ Bangkok: Southeast Asian Geotechnical Society Aerial photographs were used to study the occurrence of landslides and showed zones of weakness as lineaments. The major lineaments may be interpreted as normal or strike-slip faults. Six locations were studied in more detail, showing the structural geology to be complex with frequent landslides. The failures are divided into 3 categories: (I) due to shearing; (2) due to discontinuities, fractures or faults creating spaces within the rock; and (3) groundwater effects resulting in seepage. 894343 Chase - case history for cut slope failures Yamada, M; Inada, M; Akaishi, M; Tonosaki, A Proc Ninth Southeast Asian Geotechnicai Conference, Bangkok, 7-11 December 1987 VI, PI.69-1.78. Publ Bangkok: Southeast Asian Geotechnical Society Failure of a cut slope following a typhoon has been investigated. The groundwater level and rain from the typhoon are considered. Stability analysis was undertaken using total stress and effective stress approaches. Laboratory tests on samples of the gravelly clay were performed to determine cohesion, angle of shearing resistance and strength parameters.
1989 Pergamon Press plc. Reproduction not permitted