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Effect of stress path geometry on soil brittleness
87A
A mathamatical model is u~ed to analyse the stress distribution of anlsotropic rock disks subject to diametrical lime load~mg. Ex~mlmes the validity of t~:e split cyli~ier test (Brazilian test) of transversely Isotropic rocks. 81~0~6 G E N ~ FAYLURE C~ITERXON FOR ROCKS Price, A M; Farmer, I W Proc 21st US Symposium on Rock Mechanics, Ro!la, Missouri, 28-30 May 1980, P256-263 Reports triaxia! c o ~ e s s l o n tests using a servo c o n t r o l l e d testing machine on 7 m~iium to low strength sedlmemt~rT rocks with a rar~e of confimlng pressures up to 42 MN/sq m and axial strains up to i0 per cent. Test results illustrate both strain hardening and strain softening post peak stress behaviour and related dilation. The plotted results suggest a critical state model for predicting failure mechanisms. 815057 ~'~'~6'TOF STRES~ PATH G E O ~ ON SOIL BRInnV.EZ'E,S$ Law, K T Geotechnlque, V31, N2, June 1961, P279-287 Shows am explicit relationship exi~cs bet~-een brittleness ani stress path gecme~-y for soils of given peak a~d post-peak strength envelopes. Results from tri~xial tests on clays ~mdlcate that drained teats yield the hi~hest brittleness either when the stress paths a r e re~himg failure at the same colliding ~tress cr when they start at the same consolidation pres~ure prior to shesrimg. 8150~8 RESIDUAL STRENGTH OF L~DF~CLAY Burlington, D; SteDhenson, R W; Rockaway, J D Proc 21st US Symposium on Rock Mechanics, R ~olla, Missouri, 28-30 May 1980, P~35-~5 Describes direct shear tests on s~bcoal samples to determine residual strem@~ah. The results are compared with results of earlier plate load tests to e~tablish a relationa~p between residual s~remgth arzl in situ strength based on lowest b~arirg capacity and lowest shear strer4~th. 81~0~9 C ~ s s I r V E ~gI'HEhDTH OF A B ~ I ~ J S COKING COAL Udd, J F; Eudson, K; Templeton, D Prcc 2!st US Symposium on Rock Mechanics, Rolla, M~s~ouri, 28-30 May 1980, P~68-~75 U~axlal compression tests on coal demonstrate a clear relationa~p between cc=~essive strength and dimensio,m ~ the samples. Disl gauges o~i electrical resistance strain g~uges were used to determine the defcrmatlo~al properties plotted as stress-strain curves. Results indicate deflr.ite non elastic behavlour umd~" stress. 815060 ULTT~i~.TE LOAD BEHAVIOUR OF LATERALLY CONSTRAIneD ROCK BEAMS Sterling, R L Proc 21st US Symposium om Rock Mechanics, Rolla, Missouri, 28-30 ~£'~y1980, P533-5~2 Describes tests on laterally constrained beams with various s ~ d e F t h ratios, materials, loadi~ conditions, ani supl~rt co~iltlons. The testing a ~ r a t u s was servo controlled. Load/ deflection, isteral thrus~vertical load, eccentriclty/vertical load curves determine
failure l,x~i. It was found thst shear or slip failures ~re critical at low s p ~ d e I ~ h ratios, lateral comlressive stresses control at mid spar/delfch ratios and buckllrg failure occurs at h~gh spa~depth ratios. 815061 APPLICATION OF THE P O I ~ LOAD INDI~( TEST TO STREEE/I~. DETERMINATION OF ROCK AND FROFOSAL~ A NEW SIZE-CC~RECTION CEART Hassani, F P; Scoble, M J; Whittaker, B N Proc 21st US Symposium on Rock Mechanics, Rolla, Missouri, 28-30 May 1980, P543-553 This paper re.~orts on t h e findings of an investigation into the effect of core diameter on point load i~iex value. A diameter-correction chart and s ~ t i n g equations f~r diameters up to !00me is p r ~ . s e n t e d as an aid to sta~dardlsed index reporting. Detsiled studies are reported on the deprivation of uniaxlal and triaxial rc~k strengths fTom point iced testing data. The paper is based upon data from extensive testiDg undertaken by the authors together with data ex*~ac*~d from lr~viously published work in the field. Auth. 21 refs. 8150E2 PROGRESSI~E FAILURE S D ~ A T Y O N M.ODEL~OR BRITTLE ROCK Lundquist, R G; Helns, R W Froc 21st US Symposi~ on Rock Mechanics, Rolla, Misso~-i, ~8-3o May 1980, P591-595 Uses a two dimensions/ finite element model tO investigate the IX,ssible relationship bei~,~een rock irAhomogeneity and progressive failure. The behaviour and validity of th~ model were exami~d by modelling the Brazilian test.
Deformation characteristics 815063 MEASURING SOIL PROPERTIES WITHOUT S~4PLES Dalton, J C P Int ',tater Power Dam Cozmtr, V32, N9 Se.wt 1980, P3z-34 Discusses the problem of meas~u'ing s o i l strer~th and stlffr~ss and in situ stress in. a bcrshole and describes the Cambridge self-borir~ eXl~Lnsion and load cell pressure~ters. 815064 HVORSI~V SUHFACE IN ROCK DEFORMATION Price, A M; Farmer, I W Int J Rock Mech Min Sci, VI8, N3, June 1981, P22~234 Triaxial compression tests were carried out on rock s~It and marl spec4mens at conflni~g pressures up to 42 MN/sq m. Volumetric strains were measured using a specially adapted triaxial cell. The results showed the brittle/ductile transition to be separate from the critical state add indicated the ey.lstence of a Hvaralev surface, relating shear strength to normal stress and specific volume, bet~'een these two points. These results are fur+her validated by comparison with those reported by other .~ork~'s. Auth. 815065 ANI~0TROPIC EABDENTNG OF AN Ir~ITAALLY ISOTROPIC POROUS L.~.{E,~PONE Celle, C C; Cheatham, J B Rock Mech, %~-3, -~, March 1981, P221-233
A mathamatical model is u~ed to analyse the stress distribution of anlsotropic rock disks subject to diametrical lime load~mg. Ex~mlmes the validity of t~:e split cyli~ier test (Brazilian test) of transversely Isotropic rocks. 81~0~6 G E N ~ FAYLURE C~ITERXON FOR ROCKS Price, A M; Farmer, I W Proc 21st US Symposium on Rock Mechanics, Ro!la, Missouri, 28-30 May 1980, P256-263 Reports triaxia! c o ~ e s s l o n tests using a servo c o n t r o l l e d testing machine on 7 m~iium to low strength sedlmemt~rT rocks with a rar~e of confimlng pressures up to 42 MN/sq m and axial strains up to i0 per cent. Test results illustrate both strain hardening and strain softening post peak stress behaviour and related dilation. The plotted results suggest a critical state model for predicting failure mechanisms. 815057 ~'~'~6'TOF STRES~ PATH G E O ~ ON SOIL BRInnV.EZ'E,S$ Law, K T Geotechnlque, V31, N2, June 1961, P279-287 Shows am explicit relationship exi~cs bet~-een brittleness ani stress path gecme~-y for soils of given peak a~d post-peak strength envelopes. Results from tri~xial tests on clays ~mdlcate that drained teats yield the hi~hest brittleness either when the stress paths a r e re~himg failure at the same colliding ~tress cr when they start at the same consolidation pres~ure prior to shesrimg. 8150~8 RESIDUAL STRENGTH OF L~DF~CLAY Burlington, D; SteDhenson, R W; Rockaway, J D Proc 21st US Symposium on Rock Mechanics, R ~olla, Missouri, 28-30 May 1980, P~35-~5 Describes direct shear tests on s~bcoal samples to determine residual strem@~ah. The results are compared with results of earlier plate load tests to e~tablish a relationa~p between residual s~remgth arzl in situ strength based on lowest b~arirg capacity and lowest shear strer4~th. 81~0~9 C ~ s s I r V E ~gI'HEhDTH OF A B ~ I ~ J S COKING COAL Udd, J F; Eudson, K; Templeton, D Prcc 2!st US Symposium on Rock Mechanics, Rolla, M~s~ouri, 28-30 May 1980, P~68-~75 U~axlal compression tests on coal demonstrate a clear relationa~p between cc=~essive strength and dimensio,m ~ the samples. Disl gauges o~i electrical resistance strain g~uges were used to determine the defcrmatlo~al properties plotted as stress-strain curves. Results indicate deflr.ite non elastic behavlour umd~" stress. 815060 ULTT~i~.TE LOAD BEHAVIOUR OF LATERALLY CONSTRAIneD ROCK BEAMS Sterling, R L Proc 21st US Symposium om Rock Mechanics, Rolla, Missouri, 28-30 ~£'~y1980, P533-5~2 Describes tests on laterally constrained beams with various s ~ d e F t h ratios, materials, loadi~ conditions, ani supl~rt co~iltlons. The testing a ~ r a t u s was servo controlled. Load/ deflection, isteral thrus~vertical load, eccentriclty/vertical load curves determine
failure l,x~i. It was found thst shear or slip failures ~re critical at low s p ~ d e I ~ h ratios, lateral comlressive stresses control at mid spar/delfch ratios and buckllrg failure occurs at h~gh spa~depth ratios. 815061 APPLICATION OF THE P O I ~ LOAD INDI~( TEST TO STREEE/I~. DETERMINATION OF ROCK AND FROFOSAL~ A NEW SIZE-CC~RECTION CEART Hassani, F P; Scoble, M J; Whittaker, B N Proc 21st US Symposium on Rock Mechanics, Rolla, Missouri, 28-30 May 1980, P543-553 This paper re.~orts on t h e findings of an investigation into the effect of core diameter on point load i~iex value. A diameter-correction chart and s ~ t i n g equations f~r diameters up to !00me is p r ~ . s e n t e d as an aid to sta~dardlsed index reporting. Detsiled studies are reported on the deprivation of uniaxlal and triaxial rc~k strengths fTom point iced testing data. The paper is based upon data from extensive testiDg undertaken by the authors together with data ex*~ac*~d from lr~viously published work in the field. Auth. 21 refs. 8150E2 PROGRESSI~E FAILURE S D ~ A T Y O N M.ODEL~OR BRITTLE ROCK Lundquist, R G; Helns, R W Froc 21st US Symposi~ on Rock Mechanics, Rolla, Misso~-i, ~8-3o May 1980, P591-595 Uses a two dimensions/ finite element model tO investigate the IX,ssible relationship bei~,~een rock irAhomogeneity and progressive failure. The behaviour and validity of th~ model were exami~d by modelling the Brazilian test.
Deformation characteristics 815063 MEASURING SOIL PROPERTIES WITHOUT S~4PLES Dalton, J C P Int ',tater Power Dam Cozmtr, V32, N9 Se.wt 1980, P3z-34 Discusses the problem of meas~u'ing s o i l strer~th and stlffr~ss and in situ stress in. a bcrshole and describes the Cambridge self-borir~ eXl~Lnsion and load cell pressure~ters. 815064 HVORSI~V SUHFACE IN ROCK DEFORMATION Price, A M; Farmer, I W Int J Rock Mech Min Sci, VI8, N3, June 1981, P22~234 Triaxial compression tests were carried out on rock s~It and marl spec4mens at conflni~g pressures up to 42 MN/sq m. Volumetric strains were measured using a specially adapted triaxial cell. The results showed the brittle/ductile transition to be separate from the critical state add indicated the ey.lstence of a Hvaralev surface, relating shear strength to normal stress and specific volume, bet~'een these two points. These results are fur+her validated by comparison with those reported by other .~ork~'s. Auth. 815065 ANI~0TROPIC EABDENTNG OF AN Ir~ITAALLY ISOTROPIC POROUS L.~.{E,~PONE Celle, C C; Cheatham, J B Rock Mech, %~-3, -~, March 1981, P221-233