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Determination of mass moduli for slope design
146A
ded rocks, has been recorded at several localities as have numerous rockslides in quarries, open cut mines, and road cuts. A~rth.
the effect of tension cracks both dry and filled with water is investigated. Stability charts are presented for toe clrcles with no water in the tension crack and for homogeneous pore pressure ratios. A chart is also given for pore pressure ratio equal to zero with the tension crack filled with water. The charts have been constructed assuming the worst possible location and depth of the tension crack. As such they represent a lower bound for the safety factor. The maximum reduction in safety factor of 40 per cent was found for a slope angle of 60 degrees and a dimensionless parameter equal to 20 with the tension crack filled with water. For most cases the reduction was much less than this.
826192 EVOLUTION OF A RISK-ZONING SYSTEM FOR LANDSLIDE AREAS IN TASMANIA, AUSTRALIA Stevenson, P C; Sloane, D J Proc 3rd Australia-New Zealand Conference on Gecc~echanics, Wellington, 12-16 May 1980, V2, P73-79. Publ Wellington: New Zealand Institution of Engineers, 1980 Outlines the method b e h i n d t h e development of a descriptive and proscriptive landslip zoning system, in order to estimate the risk due to landslide damage. 826193 CLASSIFICATION OF WEATHERED FOLIATED ROCKS FOR USE IN SLOFE STABILITY PROBLEMS Sancio, R T; Brown, I Proc 3rd Australia-New Zealand Conference on Geomechanlcs, Wellington, 12-16 May 1980, V2, ~31-86. Publ Wellington: New Zealand Institution of Engineers, 1980
826197 STABILISATION OF A MUDSTONE DF/~IVED COLLUVIUM SLOPE Ramsay, G Proc 3rd Australia-New Zealand Conference on Geomechanics, Wellington, 12-16 May 1980, V2, PI07-I14. Publ Wellington: New Zealand Institution of Engineers, 1980 The design and effectiveness of d r a i r ~ e measures installed to stabilise a colluvium slope are reviewed in terms of observat[ ~ns made during construction. This additional information gained from extensive drilling and shaft excavation and piezometric readings suggested a complex gullied mudstone/colluvium interface and a complex groundwater regime, resulting in a revision of the slope model, and reanalysis of the slope stability.
A simplified classification system for use in the design of cut slopes in weathered, foliated rocks is described. A case history where this classification has been used for rock slopes in Venezuela is presented. 826194 DETERIORATION OF A DOLERITE ESCARPMENT Stevenson, P C Proc 3rd Australia-New zealand Conference on Geomechanics, Wellington, 12-16 May 1980, V2, P87-91. Publ Wellington: New Zealand Institution of Engineers, 1980
826198
A dolerite escarpment above a mountain road near Hobart, Tasmania, Australia may pose a threat to tourist traffic, and a study has been made of several modes of deterioration. Relaxation, weathering and slow movement of dolerite columns leads to several kinds of instability, some of which can be dangerous. One phenomenon, the hinge block is of particular interest as its origin is obscure, but it does not present any danger.
Presents a study on cut-off slopes of a pumice soil called Shirasu found in Japan. The paper is in 3 parts: (1) identification and classification of undisturbed Shirasu according to soil hardness, (2) determination of strength and elastic constants of undisturbed specimens and consideration of their relationship with tensile strength, and (3) stability analyses of cut-off Shirasu slopes of varying slope angles (including during earthquakes) using finite element and seismic coefficient methods Jointly.
826195 DEI'h2iMINATION OF MASS MODULI FOR SLOPE DESIGN Chappell, B A; Maurice, R Proc 3rd Australla-New Zealand Conference on Geomechanlcs, Wellington, 12-16 May 1980, V2, P93-100. Publ Wellir~on: New Zealand Institution of Engineers, 1980
826199 Classification of rock masses is correlated with in situ moduli measured from Jacking tests and theoretically derived moduli using composite elastic theory. A means of improving the in situ moduli by rock bolting is then considered° In order to assess the effectiveness of the remedial measure pseudo elastic theory is used to an~ly:+~ Lie specific problem of slope stability. The results of the moduli changes due to rock bolts are checked by in situ Jacking tests. Auth. 8261~
STABILITY CHARTS FOR SIMPLE EARTH ~qLOPES A L L Y I N G FOR TENSION CRACKS Cousins, B F Proc 3rd Australia-N~ Zealand Conference on Geomechanics, Wellington, 12-16 May 1980, V2, P101-105. Publ Wellimgton: New Zealand Institution of Engineers, 1980 Tension cracks are usua]_ly the first sign of impending failure in cohesive soils and therefore should be taken into account. In this paper
STABILITY OF CUT SLOPES IN A PUMICE SOIL DEPOSIT WITH PARTICULAR REFERENCE TO TENSILE FAILURE Yamanouchl, T; Gotoh, K; Murata, H Proc 3rd Australia-New Zealand Conference on Geomechanics, Wellington, 12-16 May 1980~ V2 s PllS-120. Publ Wellington: New Zealand Institution of Engineers, 1980
FINITE E I ~ ANALYsIs OF A SLOPE AT ILLAWARRA ESCARPMENT Valliappan, S; Evans, R S Proc 3rd Australia-New Zealand Conference on Geomechanics, Wellington, 12-16 May 1980, V2, P241-2h6. Publ Wellington: New Zealand Institution of Engineers, 1980 The results of the investigation into the stability of slope at Illawarra Escarpment using finite element methods are discussed. The numericsl modelling_ of the slope includes both Jointed and intact rock mass assumptions. The material nonlinearities of the rock mass include elastoplastic, no-tension and creep behaviour. The results for the models representing both a typical section and a steeper section of the slope indicate that no large scale failure is possible at the esc:~rpment.
ded rocks, has been recorded at several localities as have numerous rockslides in quarries, open cut mines, and road cuts. A~rth.
the effect of tension cracks both dry and filled with water is investigated. Stability charts are presented for toe clrcles with no water in the tension crack and for homogeneous pore pressure ratios. A chart is also given for pore pressure ratio equal to zero with the tension crack filled with water. The charts have been constructed assuming the worst possible location and depth of the tension crack. As such they represent a lower bound for the safety factor. The maximum reduction in safety factor of 40 per cent was found for a slope angle of 60 degrees and a dimensionless parameter equal to 20 with the tension crack filled with water. For most cases the reduction was much less than this.
826192 EVOLUTION OF A RISK-ZONING SYSTEM FOR LANDSLIDE AREAS IN TASMANIA, AUSTRALIA Stevenson, P C; Sloane, D J Proc 3rd Australia-New Zealand Conference on Gecc~echanics, Wellington, 12-16 May 1980, V2, P73-79. Publ Wellington: New Zealand Institution of Engineers, 1980 Outlines the method b e h i n d t h e development of a descriptive and proscriptive landslip zoning system, in order to estimate the risk due to landslide damage. 826193 CLASSIFICATION OF WEATHERED FOLIATED ROCKS FOR USE IN SLOFE STABILITY PROBLEMS Sancio, R T; Brown, I Proc 3rd Australia-New Zealand Conference on Geomechanlcs, Wellington, 12-16 May 1980, V2, ~31-86. Publ Wellington: New Zealand Institution of Engineers, 1980
826197 STABILISATION OF A MUDSTONE DF/~IVED COLLUVIUM SLOPE Ramsay, G Proc 3rd Australia-New Zealand Conference on Geomechanics, Wellington, 12-16 May 1980, V2, PI07-I14. Publ Wellington: New Zealand Institution of Engineers, 1980 The design and effectiveness of d r a i r ~ e measures installed to stabilise a colluvium slope are reviewed in terms of observat[ ~ns made during construction. This additional information gained from extensive drilling and shaft excavation and piezometric readings suggested a complex gullied mudstone/colluvium interface and a complex groundwater regime, resulting in a revision of the slope model, and reanalysis of the slope stability.
A simplified classification system for use in the design of cut slopes in weathered, foliated rocks is described. A case history where this classification has been used for rock slopes in Venezuela is presented. 826194 DETERIORATION OF A DOLERITE ESCARPMENT Stevenson, P C Proc 3rd Australia-New zealand Conference on Geomechanics, Wellington, 12-16 May 1980, V2, P87-91. Publ Wellington: New Zealand Institution of Engineers, 1980
826198
A dolerite escarpment above a mountain road near Hobart, Tasmania, Australia may pose a threat to tourist traffic, and a study has been made of several modes of deterioration. Relaxation, weathering and slow movement of dolerite columns leads to several kinds of instability, some of which can be dangerous. One phenomenon, the hinge block is of particular interest as its origin is obscure, but it does not present any danger.
Presents a study on cut-off slopes of a pumice soil called Shirasu found in Japan. The paper is in 3 parts: (1) identification and classification of undisturbed Shirasu according to soil hardness, (2) determination of strength and elastic constants of undisturbed specimens and consideration of their relationship with tensile strength, and (3) stability analyses of cut-off Shirasu slopes of varying slope angles (including during earthquakes) using finite element and seismic coefficient methods Jointly.
826195 DEI'h2iMINATION OF MASS MODULI FOR SLOPE DESIGN Chappell, B A; Maurice, R Proc 3rd Australla-New Zealand Conference on Geomechanlcs, Wellington, 12-16 May 1980, V2, P93-100. Publ Wellir~on: New Zealand Institution of Engineers, 1980
826199 Classification of rock masses is correlated with in situ moduli measured from Jacking tests and theoretically derived moduli using composite elastic theory. A means of improving the in situ moduli by rock bolting is then considered° In order to assess the effectiveness of the remedial measure pseudo elastic theory is used to an~ly:+~ Lie specific problem of slope stability. The results of the moduli changes due to rock bolts are checked by in situ Jacking tests. Auth. 8261~
STABILITY CHARTS FOR SIMPLE EARTH ~qLOPES A L L Y I N G FOR TENSION CRACKS Cousins, B F Proc 3rd Australia-N~ Zealand Conference on Geomechanics, Wellington, 12-16 May 1980, V2, P101-105. Publ Wellimgton: New Zealand Institution of Engineers, 1980 Tension cracks are usua]_ly the first sign of impending failure in cohesive soils and therefore should be taken into account. In this paper
STABILITY OF CUT SLOPES IN A PUMICE SOIL DEPOSIT WITH PARTICULAR REFERENCE TO TENSILE FAILURE Yamanouchl, T; Gotoh, K; Murata, H Proc 3rd Australia-New Zealand Conference on Geomechanics, Wellington, 12-16 May 1980~ V2 s PllS-120. Publ Wellington: New Zealand Institution of Engineers, 1980
FINITE E I ~ ANALYsIs OF A SLOPE AT ILLAWARRA ESCARPMENT Valliappan, S; Evans, R S Proc 3rd Australia-New Zealand Conference on Geomechanics, Wellington, 12-16 May 1980, V2, P241-2h6. Publ Wellington: New Zealand Institution of Engineers, 1980 The results of the investigation into the stability of slope at Illawarra Escarpment using finite element methods are discussed. The numericsl modelling_ of the slope includes both Jointed and intact rock mass assumptions. The material nonlinearities of the rock mass include elastoplastic, no-tension and creep behaviour. The results for the models representing both a typical section and a steeper section of the slope indicate that no large scale failure is possible at the esc:~rpment.