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Combined point estimate and Monte Carlo techniques for the analysis of wedge failure in rock slopes
191A 923404 Landfill deformation monitoring and stability analysis Duplancic, N Proc Symposium on Geotechnics of Waste Fills - Theory and Practice, Pittsbarg, 10-13 Sept 1989 P303-315. Publ Philadelphia: ASTM, 1990 ( A S T M Special Technical Publication 1070) The case of a large hazardous waste fill constructed on a shallow valley slope is examined. The unlined fill is underlain by 23m of native clay colluvium over weathered shale bedrock. Maximum fill thickness is 4Ore. The groundwater regime and fill deformation have been monitored, subsurface stratigraphy examined, and an extensive database of properties of the fill soil materials built up. Static stability analysis using modified Bishop and simplified Janbu methods within STABL2 and dynamic analysis according to ICLD recommendations have been carried out. The landfill is seen to be stable. 923405 Combined point estimate and Monte Carlo techniques for the analysis of wedge failure in rock slopes Esterhuizen, G S Proc INRM Intermu~onal Symposium oR Static and Dynamic Considerations in Rock F,~i~ering, Swazilaml, 10-12 September 1990 P125-132. Publ Rotterdam: A A Balkema, 1990 To take into account variability in joint length, spacing, and strength, probabilistic methods are required to estimate frequency of failure of rock wedges in a rock slope. Point estimate methods can be used for rapid analysis of variability of strength parameters. Monte Carlo techniques can be used to evaluate geometrical variations of wedges. Frequency of wedge formation is determined taking into account joint continuity and spacing. Total volume of wedge failure is then evaluated. Probability of failure is more sensitive to joint geometry than to strength. Frequency of failure is very sensitive to joint persistence. 9234O6 Morphological classification of debris-flow processes in SouthCemr~ A ~ (Italy) Crosta, G; Marchetti, M, Guzzetti, F; Reichenhach, P Proc 6tk Interlmtio~! CoRgress l m e r u t i o ~ AssociatioR of Engbwering Geology, Amsterdam, 6-10 Angust 1990 1/3, P1565-1572. Publ Rotterdam: A A Balkema, 1990 Over 500 debris flows were triggered in three basins in the Valteilina area of Italy due to the 17-19 July 1987 earthquake. The relief was typical of alpine torrent basins. Underlying rocks were metamorphic. Debris flows in unchannelled basins, debris flows in channelled basins, debris avalanches, and debris torrents were recorded, according to type of initial slope movement, slope angle, hillside topography, vegetation, and drainage conditions. Debris flow hazards are assessed. 9234O7 Case study of the morphology on the unstable slopes Hongey Chen Proc 6tk lntersmtimml Congress lmerJtimml Assodation of Es#~Jeerisg Geology, Amsterdam, 6-10 AREsat 1990 V3, P1603-1608. Publ Rotterdam: A A Balkema, 1990 A study was undertaken into the development and mechanisms of slope instabilities occurring on colluvium covered sedimentary rocks under conditions of tropical and subtropical weathering at a construction site in Taiwan. Geological
and geotechnical investigations and mapping of slope gradation and water table were carried out. Several large translational slides occurred during development. These could have been foreseen and expensive remedial work made unnecessary if the survey had been undertaken prior to development. 9234~ Braunwald (Swiss Alps): investigation, analysis and partial stabilization of a big landslide Sehindler, C; Rageth, R Proc 6th lntermuiomd Congress ImermaioM! Association of F,q i s e e r i q Geology, Amsterdam, 6-10 Amgast 1990 I/3, P1705-1711. Publ Rotterdam: A A Balkema, 1990 The village of Braunwald lies on a landslide which has been affected by displacements over a 3-4 sq km region in the past 60 years. The moving mass is up to 150m deep and covers a large terrace high over the main valley. Displacement increases downslope. Because of the scale, global stabilisation is unrealistic. Work at a rapidly moving, endangered area is described. Large boreholes, 1.3m diameter and 16-20m deep, were drilled, filled with gravel, then connected by a subhorizontal drain just a small distance above the slide plane. Movement is reduced and toe erosion stopped. 923409 Example of big landslides in Ecuador (In French) Sevilla, J H Proc 6tb Imermttioul Congress lmermaional Association of Engineering Geology, Amsterdam, 6-10 August 1990 V3, 1'1713-1717.Publ Rotterdam" A A Balkema, 1990 Geological investigation of the region around the active volcano Reventador is described. Two large paleolandslides and an alluvial terrace are the main features. Two earthquakes with local epicentres and magnitudes of 6.0 and 6.8 occurred on 5th March 1987, resulting in thousands of landslides, causing severe damage. The scale of the disaster demonstrates the inherent instability of the equatorial Andes. 923410 Genesis of complex deformation on the slopes of the Drina river Sunaric, D Proc 6tk lntermuiomd Congress lmermaiomd Association of Engineering Geology, Amsterdam, 6-10 Amgast 1990 I/3, P1719-1723. Publ Rotterdam: A A Balkema, 1990 The Drina river in Yugoslavia has in its upper reaches cut its channel through limestone and dolomite then underlying elastic rocks, arglllo-schists and sandstones. Complex, large slumps, slides, and mixed slope failures have resulted. Springs discharging at the limestone-schist interface have softened relatively plastic elastic rocks, and resulting deformations have progressed upwards and loosened limestone blocks. Sliding and slopewash are the main movement mechanisms. Details of three specific slides are presented. 923411 Analysis of slope-failedsites~
a distal geologic dam bue system Tajiri,K; Imaizumi, S; Nakayama, H Proc 6tk i m ~ C o ~ s s International Association of Eqiocerisg Geology, Amsterdam, 6-10 A q ~ t 1990 I/3, P1725-1731. Publ Rotterdam: A A Balkema, 1990 Rainfall-induced slope failuresare dependent on geomorphic and geologic factors as well as on rainfallmagnitude. Slope failures on Mt Manotani in SW Japan have been studied and details of rock type, slope inclination and direction, slope cover and vegetation, and slope shape were recorded. Using Hayashi's Second Method of Quantification, the relative
© 1992 Pergamon Press Ltd. Reproduction not permitted
and geotechnical investigations and mapping of slope gradation and water table were carried out. Several large translational slides occurred during development. These could have been foreseen and expensive remedial work made unnecessary if the survey had been undertaken prior to development. 9234~ Braunwald (Swiss Alps): investigation, analysis and partial stabilization of a big landslide Sehindler, C; Rageth, R Proc 6th lntermuiomd Congress ImermaioM! Association of F,q i s e e r i q Geology, Amsterdam, 6-10 Amgast 1990 I/3, P1705-1711. Publ Rotterdam: A A Balkema, 1990 The village of Braunwald lies on a landslide which has been affected by displacements over a 3-4 sq km region in the past 60 years. The moving mass is up to 150m deep and covers a large terrace high over the main valley. Displacement increases downslope. Because of the scale, global stabilisation is unrealistic. Work at a rapidly moving, endangered area is described. Large boreholes, 1.3m diameter and 16-20m deep, were drilled, filled with gravel, then connected by a subhorizontal drain just a small distance above the slide plane. Movement is reduced and toe erosion stopped. 923409 Example of big landslides in Ecuador (In French) Sevilla, J H Proc 6tb Imermttioul Congress lmermaional Association of Engineering Geology, Amsterdam, 6-10 August 1990 V3, 1'1713-1717.Publ Rotterdam" A A Balkema, 1990 Geological investigation of the region around the active volcano Reventador is described. Two large paleolandslides and an alluvial terrace are the main features. Two earthquakes with local epicentres and magnitudes of 6.0 and 6.8 occurred on 5th March 1987, resulting in thousands of landslides, causing severe damage. The scale of the disaster demonstrates the inherent instability of the equatorial Andes. 923410 Genesis of complex deformation on the slopes of the Drina river Sunaric, D Proc 6tk lntermuiomd Congress lmermaiomd Association of Engineering Geology, Amsterdam, 6-10 Amgast 1990 I/3, P1719-1723. Publ Rotterdam: A A Balkema, 1990 The Drina river in Yugoslavia has in its upper reaches cut its channel through limestone and dolomite then underlying elastic rocks, arglllo-schists and sandstones. Complex, large slumps, slides, and mixed slope failures have resulted. Springs discharging at the limestone-schist interface have softened relatively plastic elastic rocks, and resulting deformations have progressed upwards and loosened limestone blocks. Sliding and slopewash are the main movement mechanisms. Details of three specific slides are presented. 923411 Analysis of slope-failedsites~
a distal geologic dam bue system Tajiri,K; Imaizumi, S; Nakayama, H Proc 6tk i m ~ C o ~ s s International Association of Eqiocerisg Geology, Amsterdam, 6-10 A q ~ t 1990 I/3, P1725-1731. Publ Rotterdam: A A Balkema, 1990 Rainfall-induced slope failuresare dependent on geomorphic and geologic factors as well as on rainfallmagnitude. Slope failures on Mt Manotani in SW Japan have been studied and details of rock type, slope inclination and direction, slope cover and vegetation, and slope shape were recorded. Using Hayashi's Second Method of Quantification, the relative
© 1992 Pergamon Press Ltd. Reproduction not permitted