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In-situ shear test for rock fills. Closure of discussion of paper, J. Geotech. Engng Div. Sept. 1974
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814 MIKHEEV,W IGNATOVA, 01 Determination of design values of strength characteristics of soils. 2T,2R. SOIL MECH .FOUND.E~GNG,VI2, N4, JUL-AUG .1975,P268- 271.
815 DUNKERLEY, DL A. N .U.CANBE~RRA,AUS. A study of long-term slope stability in the Sydney Basin, Australia. 4F,2T,31R. ENGNG .GEOL. ,VIO,NI, 1976, Pl-12. A study of slopes in the Sydney Basin indicates landslide occurrence and long-term stability are both governed by the residual shear strength of the clay soils derived from Triassic shales. On the Wianamatta shales of the Razorback Range, landslides may only occur on slopes in excess of lldeg. The average value of ~'residual measured in direct shear was 22deg. while C'residual values were small but positive.
Deformation characteristics 816 JAIN, SP GUPTA,RC In-situ shear test for rock fills. Closure of discussion of paper, J.Geotech.Engng Div. Sept.197~.2F,3R. J. GEOTECH. ~ G N G DIV. ASC E,V102, GT5,1976, P565 -569. 817 HAMEL, JV G ~ .ANALYTICS INC .MONROEVILLE, PENN .USA Large-scale laboratory direct shear tests on desert alluvium. Symposium. 9F,4T,12R. APPLICATIONS OF ROCK MECHANICS,PROC.15TH SYMP.ROCK MECH., SOUTH DAKOTA .ASCE,1975, P385 -hl4. Laboratory direct shear tests on one cubic foot specimens of desert alluvium are described and the results are summarized.
Surface properties 818 SCHOLZ, JT GEOL.OBS. COIAR4B.UNIV .PALISADES,NY, USA ENGELD~, CH GEOL. OBS. COLUHB. UN IV. PALl SADES, NY, USA The role of asperity indentation and ploughing in rock friction. - 1.Asparity creep and stick-slip. 9F,IT,18R. INT .J .ROCK MECH .MIN.SC I .GEOMECH.ABSTR .VI3,N5,1976,
~149-15~. Two processes which produce the stick-slip instability instability in the frictional sliding of rock have been identified. These are: (1) fracture of asperities at the onset of sliding, and (2) creep at the sliding surface leading to a progressive increase in real area of contact with time. The second process produces an increase in friction with increased time of stationary contact or decreased sliding velocity, and results from stress corrosion cracking sz~d/or hydrolytic weakening. The Bowden and Tabor adhesion theory, when modified to include asperity creep, adequately predicts the frictional behaviour of rock when brittle fracture of asperities is inhibited. Auth.
Time-dependent behaviour 82O AND~SON,DG PUGRO INC.LONG BEACH, CALIF.USA WOODS, RD UNIV .MICHIGAN,ANN ARBOR,USA Time-dependent increase in cley shear. 9F,2T,IOR. J .GEOTECH.ENGNG DIV.ASCE,V102,GTS, 1976,P525-537. Two time domains for modulus increase have been identified, pr~,~ry and secondary. Prt.~-y is the same as for prlmary consolidation and secondary is the open interval after primary in which modulus increases continuously with time. It was found that all cohesive soils exhibit secondary modulus increase. The rate of secondary increase is related to the undrained shearing strength and the initial void ratio of the soil. An empirical equation is presented to show this relationship. Thixotropy best explains secondary modulus increase. Auth. 821 TRUM~EL, JE Creep testing of samples of sylvinite, carnallite, halite and tachyhydrite, Sergipe Basin, East-Central Brazil. M.S .THESIS,STANFORD UNIV.USA, 197~. Thirteen samples of salt, including sylvinite, carnallite, halite, and tachyhydrite, from am evaporite sequence in the Sergipe Basin of east-central Brazil, were tested in order to determine probable behaviours of the salts near mine openings so that various mining methods c~n be evaluated. Test specimens were drilled from the samples and tested under triaxial creep conditions, in which axial load and confining pressure were constant and axial strain was monitored as a function of time. Auth.
Physico-chemical properties 822 PIWINSKII,AJ UNIV .CALIF .LIVERMORE,USA DUBA,A The permittivity an The permittivity and electrical conductivity of oil shale. Technical note. 4F,3R. INT .J.ROCK MECH .MIN.SC I.GEOMECH .ABSTR .V13,N5,1976, P165.166
Permeability and capillarity 823 NELSON,RA Fracture permeability in porous reservoirs: an experimental and field al~woech. PH.D.THESIS,TEXAS A & M UNIV.VI6,NI7,1975,185P. Laboratory experiments on the effect of temperature and confining l~essure ca permeability of Navs4o samdstone are reported. The results indicate that s~w;lated frac° tures in porous rock h o e a higher percemtage rate of permeability decline with depth than whole rock, and experience a greater degree of perm~nemt deformation with depth. They are effectively healed when fracture permeability al~oeches that of the whole rock, and they exPeri~mce a r ~ c t i o n in p~meability depmmdent on the ~ r o s c o p i c ductility and previous maxl,m,m depth of burial of the host sandstone.
819 ENGELD~R, JT GEOL.OBS. COIJ3MB,UNIV. PALISADES, NY, USA SCHO Z,CH GEOL .OBS.COLUMB, UNIV. PALISADES, NY, USA The role of asperity indentation and ploughing in rock friction. 2. Influmuce of relative hardness and normal load. llF,16R. INT.J.ROCK MECH oMIN.SCI. GEOM~CH. ABSTR .VI3,N5,1976, P155-163.
824 PARSONS, JD New York's glacial lake formation of varved silt and clay. 17F, 3T, 16R. J .GEOTECH. ENGNG DIV .ASCE,VI02,GT6, JUNE, 1976, P605-638 • The principal and distinct subsoil of New York City is
814 MIKHEEV,W IGNATOVA, 01 Determination of design values of strength characteristics of soils. 2T,2R. SOIL MECH .FOUND.E~GNG,VI2, N4, JUL-AUG .1975,P268- 271.
815 DUNKERLEY, DL A. N .U.CANBE~RRA,AUS. A study of long-term slope stability in the Sydney Basin, Australia. 4F,2T,31R. ENGNG .GEOL. ,VIO,NI, 1976, Pl-12. A study of slopes in the Sydney Basin indicates landslide occurrence and long-term stability are both governed by the residual shear strength of the clay soils derived from Triassic shales. On the Wianamatta shales of the Razorback Range, landslides may only occur on slopes in excess of lldeg. The average value of ~'residual measured in direct shear was 22deg. while C'residual values were small but positive.
Deformation characteristics 816 JAIN, SP GUPTA,RC In-situ shear test for rock fills. Closure of discussion of paper, J.Geotech.Engng Div. Sept.197~.2F,3R. J. GEOTECH. ~ G N G DIV. ASC E,V102, GT5,1976, P565 -569. 817 HAMEL, JV G ~ .ANALYTICS INC .MONROEVILLE, PENN .USA Large-scale laboratory direct shear tests on desert alluvium. Symposium. 9F,4T,12R. APPLICATIONS OF ROCK MECHANICS,PROC.15TH SYMP.ROCK MECH., SOUTH DAKOTA .ASCE,1975, P385 -hl4. Laboratory direct shear tests on one cubic foot specimens of desert alluvium are described and the results are summarized.
Surface properties 818 SCHOLZ, JT GEOL.OBS. COIAR4B.UNIV .PALISADES,NY, USA ENGELD~, CH GEOL. OBS. COLUHB. UN IV. PALl SADES, NY, USA The role of asperity indentation and ploughing in rock friction. - 1.Asparity creep and stick-slip. 9F,IT,18R. INT .J .ROCK MECH .MIN.SC I .GEOMECH.ABSTR .VI3,N5,1976,
~149-15~. Two processes which produce the stick-slip instability instability in the frictional sliding of rock have been identified. These are: (1) fracture of asperities at the onset of sliding, and (2) creep at the sliding surface leading to a progressive increase in real area of contact with time. The second process produces an increase in friction with increased time of stationary contact or decreased sliding velocity, and results from stress corrosion cracking sz~d/or hydrolytic weakening. The Bowden and Tabor adhesion theory, when modified to include asperity creep, adequately predicts the frictional behaviour of rock when brittle fracture of asperities is inhibited. Auth.
Time-dependent behaviour 82O AND~SON,DG PUGRO INC.LONG BEACH, CALIF.USA WOODS, RD UNIV .MICHIGAN,ANN ARBOR,USA Time-dependent increase in cley shear. 9F,2T,IOR. J .GEOTECH.ENGNG DIV.ASCE,V102,GTS, 1976,P525-537. Two time domains for modulus increase have been identified, pr~,~ry and secondary. Prt.~-y is the same as for prlmary consolidation and secondary is the open interval after primary in which modulus increases continuously with time. It was found that all cohesive soils exhibit secondary modulus increase. The rate of secondary increase is related to the undrained shearing strength and the initial void ratio of the soil. An empirical equation is presented to show this relationship. Thixotropy best explains secondary modulus increase. Auth. 821 TRUM~EL, JE Creep testing of samples of sylvinite, carnallite, halite and tachyhydrite, Sergipe Basin, East-Central Brazil. M.S .THESIS,STANFORD UNIV.USA, 197~. Thirteen samples of salt, including sylvinite, carnallite, halite, and tachyhydrite, from am evaporite sequence in the Sergipe Basin of east-central Brazil, were tested in order to determine probable behaviours of the salts near mine openings so that various mining methods c~n be evaluated. Test specimens were drilled from the samples and tested under triaxial creep conditions, in which axial load and confining pressure were constant and axial strain was monitored as a function of time. Auth.
Physico-chemical properties 822 PIWINSKII,AJ UNIV .CALIF .LIVERMORE,USA DUBA,A The permittivity an The permittivity and electrical conductivity of oil shale. Technical note. 4F,3R. INT .J.ROCK MECH .MIN.SC I.GEOMECH .ABSTR .V13,N5,1976, P165.166
Permeability and capillarity 823 NELSON,RA Fracture permeability in porous reservoirs: an experimental and field al~woech. PH.D.THESIS,TEXAS A & M UNIV.VI6,NI7,1975,185P. Laboratory experiments on the effect of temperature and confining l~essure ca permeability of Navs4o samdstone are reported. The results indicate that s~w;lated frac° tures in porous rock h o e a higher percemtage rate of permeability decline with depth than whole rock, and experience a greater degree of perm~nemt deformation with depth. They are effectively healed when fracture permeability al~oeches that of the whole rock, and they exPeri~mce a r ~ c t i o n in p~meability depmmdent on the ~ r o s c o p i c ductility and previous maxl,m,m depth of burial of the host sandstone.
819 ENGELD~R, JT GEOL.OBS. COIJ3MB,UNIV. PALISADES, NY, USA SCHO Z,CH GEOL .OBS.COLUMB, UNIV. PALISADES, NY, USA The role of asperity indentation and ploughing in rock friction. 2. Influmuce of relative hardness and normal load. llF,16R. INT.J.ROCK MECH oMIN.SCI. GEOM~CH. ABSTR .VI3,N5,1976, P155-163.
824 PARSONS, JD New York's glacial lake formation of varved silt and clay. 17F, 3T, 16R. J .GEOTECH. ENGNG DIV .ASCE,VI02,GT6, JUNE, 1976, P605-638 • The principal and distinct subsoil of New York City is