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Comparative study of creep in rock and its discontinuities
8~
Time dependent behaviour See also: 81~210 81~
u ~ OF TXE E ~ C H R O ~ C T m ~ a Y oN R ~ K ~ r (~N G~HAN) Rlch~er, T; Wulf, A; B~rchert, K M Rock Mech, VI3, N3, Feb 1981, PI31-1M3 On the basis of the emdochronic theory a material model which can describe the bchaviour of rock salt is developed. This study ;resents an~ follows in a modified for~ the e~rlier wurk of Valanis in m~tals a n i Bazant-~at in cor~rete. The deformation characteristics of rock salt, subject I:o extensive creep, are described and explained by an s_nalogo~ theological m~iel. This model Is used to determine the materia/ functions constants fur the erdochronic formulation. The material law is written in tensor form ani keys fur its use i n ~ computer ;ro~ram are supplied. Auth.
81~o76
OF ~ u , ~ o s ~ ~ m Z D Z C ~ O N OF ~A~ZS OZ ~ OF ZZ~Z S O ~ S M A ~ L Z TO
CREEP (IN FRENCH) Msd~man, J P; Ba6hery, S Bull Liaison Lab Ponts Chaussees, NIII, Jan-
815079 STRF~S RELAXATION I~ 01~ SHALE Olsson, W A Proc 21st US Symposium on Rock Mechanics, Rolls, Missouri, 28-30 May 1980, P517-~22 Describes servo co.utrolled u~cor~i~i s~ressre2~sxation Tests on oil shales of 2 d~fferent grades. The stress-strain-ti~e curves are ar~lysed and pre~ented ~Ithin the ~ u r k of a linear viscoelastic constitutive law. Using *~he constants evaluated from the stress rel~_xAtion tests, the law predicts zcc,Arately the correct constant strain-rate stress-s%r-~in r o spOnS@ 81~(~0 CC~[PARATIVE ,5%q/DYOF CREEP IN ROCK AND ITS DISCONTI f~/ITIES Curran, J E; Cr~wford, A M Proc 21st US Symposit~n on 2ock Mechanics,
Rolla, Missouri, 28-30 YM~y1980, P576-603 Models the creep behavlour of a Joimt~i rock mass usir~ an extension of the displacement discontinuity method which is essenti~lly a botmiaz~- i n t e g r a l technique. Presents 3 examples which illustrate the applicabilit~ of the :aAmerical technique amd demonstrate the relative Impc~tamce of Joir~ creep on the overall t~medependent behaviour of discontinuous rock ;~sses.
~eb 1981, ~S7-9~ The authurs describe n me*hod of calculating settlements over a period of time baaed on breaking down the settlement into a consolidation settlement in the absen-e of creep, a~i a term re1~esenting the contribution made by plastic yield. The method has beer. developed on a theuretical basis, u s in g a parametric study of the influence of creep. The al~lication of the proposed method to real embankments has not however g i v e n the results hoped for, due probe~ly to an unle~-e~timation of the rate of primary consolidation of the soil. 81~D77 ~ s m , z~.,~os OF A SEv SSZZmOSZOAL ~Z)m A}~ rrs APPZ:CATIO.S ~O ~ZZ VBZU~Y OF CONSC~DA~ZON Felix, B Bull L i a i s o n Lab Ponts Chaussees, Nlll, JanFeb 1981, P92-I03 Long term uree.p tests gave evidemce that it was possible tO describe oedcmetric strain u m i ~ cor~ti~Aousl~ ~rowing loads u s i n g a r h e o l o 6 i c a l model baaed upon t h e principle of ~ p o s i t l o n . Used as state equation of the skeleton ~n a con~mlldation theury fur unsaturated soils, it leads to a correct representation of strains anl initial increase of pure pressures to a maximum which is ~m~l Ie~ than the applied load: The r e s u l t s a r e r e p r e s e n t e d i n form of charts.
81~o78 CONSC~IDA~ION ~ D C R ~
OF POROUS SILTY CLAYS
OV~LY~N~ TEXAS LIGNITE. Thompson, T W; Wmmklm~on, R J ; Gray, K E Prom 21st US Symposium on Rock Mechanics, Rolls, Missouri, 28-30 May 1980, ~76-~8~
D e s c r i b e s drained azzl, ~-~ained %rlaxlal c r e e p tests an~ drained uniax~al c T c l l c l o s t i n g tests on silty clay. All results show creep umdur hydrostatic amd ~on-h~rosta~ic s t a t e s of s t r e s s . L i n e a r viscoelastic models for predicting creep are pre~ezted. While these give a gOOd fit at one stress level, they f~.~3 tO predict t h e reel~onse to cham61ng stre~s.
Permeability and capillarity 81~081 TRANSIENT LABORATORY M ~ H O D FC~ DETERMINTNG THE RYDP~LU.7C PROPERTIES OF 'TIGHT' ROCKS - I. THECRY Hsieh, P A; Tr~cy, J v; Neuzil, C E Int J ~OCk Mech Min Sci, V!8, N3, June ].981,
Transient pulse testing has bee~ employed increasin61y In the 2ab
81~o82 TRANSIENT
LABORATORY METHOD FC~ DET~4I_VI~ THE RYDRAL%IC PROPERTIES OF 'TIGHT' ROCKS - 2. APPL [CAT~ON N~,zil, C E; Cooley, C; Silllm~a, ~ E Ir~ J Rock Mech Min Sci, V!8, N~, June 1981,
P2~3-298 Zn Part 1 (item 81~0,qi) a general analytical solution f o r the transient ~ I s e test was ;resented. ~ r T 2 l~esents a grapb_Ical methal for amlysi~g data from a t e s t to obtain the hydraulic conductivity a ~ specific sturage e ~ , in theory, rcslysis of the data can ;r~ide values fur both of these h~Iraulic properties. However, in lumctice, one of two llmitir~ c~ses m.y a l ~ in which case it is possible to calculate only h~mL~aulic conductivity cr the product of hpdraullc co-~uctlvlty times specific stur~ge. This paper examines the coniitions when both hydraulic p a r a m e t e r s c~_nbe calculated. The a n a l y s e s of data from two t e ~ t s s r e prea,ented.
Time dependent behaviour See also: 81~210 81~
u ~ OF TXE E ~ C H R O ~ C T m ~ a Y oN R ~ K ~ r (~N G~HAN) Rlch~er, T; Wulf, A; B~rchert, K M Rock Mech, VI3, N3, Feb 1981, PI31-1M3 On the basis of the emdochronic theory a material model which can describe the bchaviour of rock salt is developed. This study ;resents an~ follows in a modified for~ the e~rlier wurk of Valanis in m~tals a n i Bazant-~at in cor~rete. The deformation characteristics of rock salt, subject I:o extensive creep, are described and explained by an s_nalogo~ theological m~iel. This model Is used to determine the materia/ functions constants fur the erdochronic formulation. The material law is written in tensor form ani keys fur its use i n ~ computer ;ro~ram are supplied. Auth.
81~o76
OF ~ u , ~ o s ~ ~ m Z D Z C ~ O N OF ~A~ZS OZ ~ OF ZZ~Z S O ~ S M A ~ L Z TO
CREEP (IN FRENCH) Msd~man, J P; Ba6hery, S Bull Liaison Lab Ponts Chaussees, NIII, Jan-
815079 STRF~S RELAXATION I~ 01~ SHALE Olsson, W A Proc 21st US Symposium on Rock Mechanics, Rolls, Missouri, 28-30 May 1980, P517-~22 Describes servo co.utrolled u~cor~i~i s~ressre2~sxation Tests on oil shales of 2 d~fferent grades. The stress-strain-ti~e curves are ar~lysed and pre~ented ~Ithin the ~ u r k of a linear viscoelastic constitutive law. Using *~he constants evaluated from the stress rel~_xAtion tests, the law predicts zcc,Arately the correct constant strain-rate stress-s%r-~in r o spOnS@ 81~(~0 CC~[PARATIVE ,5%q/DYOF CREEP IN ROCK AND ITS DISCONTI f~/ITIES Curran, J E; Cr~wford, A M Proc 21st US Symposit~n on 2ock Mechanics,
Rolla, Missouri, 28-30 YM~y1980, P576-603 Models the creep behavlour of a Joimt~i rock mass usir~ an extension of the displacement discontinuity method which is essenti~lly a botmiaz~- i n t e g r a l technique. Presents 3 examples which illustrate the applicabilit~ of the :aAmerical technique amd demonstrate the relative Impc~tamce of Joir~ creep on the overall t~medependent behaviour of discontinuous rock ;~sses.
~eb 1981, ~S7-9~ The authurs describe n me*hod of calculating settlements over a period of time baaed on breaking down the settlement into a consolidation settlement in the absen-e of creep, a~i a term re1~esenting the contribution made by plastic yield. The method has beer. developed on a theuretical basis, u s in g a parametric study of the influence of creep. The al~lication of the proposed method to real embankments has not however g i v e n the results hoped for, due probe~ly to an unle~-e~timation of the rate of primary consolidation of the soil. 81~D77 ~ s m , z~.,~os OF A SEv SSZZmOSZOAL ~Z)m A}~ rrs APPZ:CATIO.S ~O ~ZZ VBZU~Y OF CONSC~DA~ZON Felix, B Bull L i a i s o n Lab Ponts Chaussees, Nlll, JanFeb 1981, P92-I03 Long term uree.p tests gave evidemce that it was possible tO describe oedcmetric strain u m i ~ cor~ti~Aousl~ ~rowing loads u s i n g a r h e o l o 6 i c a l model baaed upon t h e principle of ~ p o s i t l o n . Used as state equation of the skeleton ~n a con~mlldation theury fur unsaturated soils, it leads to a correct representation of strains anl initial increase of pure pressures to a maximum which is ~m~l Ie~ than the applied load: The r e s u l t s a r e r e p r e s e n t e d i n form of charts.
81~o78 CONSC~IDA~ION ~ D C R ~
OF POROUS SILTY CLAYS
OV~LY~N~ TEXAS LIGNITE. Thompson, T W; Wmmklm~on, R J ; Gray, K E Prom 21st US Symposium on Rock Mechanics, Rolls, Missouri, 28-30 May 1980, ~76-~8~
D e s c r i b e s drained azzl, ~-~ained %rlaxlal c r e e p tests an~ drained uniax~al c T c l l c l o s t i n g tests on silty clay. All results show creep umdur hydrostatic amd ~on-h~rosta~ic s t a t e s of s t r e s s . L i n e a r viscoelastic models for predicting creep are pre~ezted. While these give a gOOd fit at one stress level, they f~.~3 tO predict t h e reel~onse to cham61ng stre~s.
Permeability and capillarity 81~081 TRANSIENT LABORATORY M ~ H O D FC~ DETERMINTNG THE RYDP~LU.7C PROPERTIES OF 'TIGHT' ROCKS - I. THECRY Hsieh, P A; Tr~cy, J v; Neuzil, C E Int J ~OCk Mech Min Sci, V!8, N3, June ].981,
Transient pulse testing has bee~ employed increasin61y In the 2ab
81~o82 TRANSIENT
LABORATORY METHOD FC~ DET~4I_VI~ THE RYDRAL%IC PROPERTIES OF 'TIGHT' ROCKS - 2. APPL [CAT~ON N~,zil, C E; Cooley, C; Silllm~a, ~ E Ir~ J Rock Mech Min Sci, V!8, N~, June 1981,
P2~3-298 Zn Part 1 (item 81~0,qi) a general analytical solution f o r the transient ~ I s e test was ;resented. ~ r T 2 l~esents a grapb_Ical methal for amlysi~g data from a t e s t to obtain the hydraulic conductivity a ~ specific sturage e ~ , in theory, rcslysis of the data can ;r~ide values fur both of these h~Iraulic properties. However, in lumctice, one of two llmitir~ c~ses m.y a l ~ in which case it is possible to calculate only h~mL~aulic conductivity cr the product of hpdraullc co-~uctlvlty times specific stur~ge. This paper examines the coniitions when both hydraulic p a r a m e t e r s c~_nbe calculated. The a n a l y s e s of data from two t e ~ t s s r e prea,ented.