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Strength behaviour of soil-asphalt mixtures in compression. 8F, 2T, 9R
36A
342 JAGANNAE~, K IND. INST .TECHNOL.M A I ~ , IND Plastic relaxation of a shear crack at a circular inclusion. 4F,8R. INT.J. ENGNG SC I. ,V13,N7-8,1975, P725-729.
343 VARDAR, 0 ON IV. CALIF .B~KELEY, USA FINNIE, I UNIV .CALIF .B~KELEY, USA An analysis of t h e Brazilian disk fracture test using the Weibull probabilistic treatment of brittle strength. IIF, 2T, 25R. INT.J .FRACTURE,VII, N3, JUNE 1975, P495-508. It is pointed out that the Weibu11 multiaxial treatment of brittle strength contains limitations which are not present in the more familiar uniaxlal formulation. Provided these limitations are satisfied, it is possible to use tension or bending data to predict ~multiaxial bahaviour when at least one principal stress is tensile. This is illustrated for the Brazilian disc test. Predictions based on bending tests agree well with observed strength values in disc tests on two types of rocks. Auth.
344 HI~T.T.~,TK C EGB.B~{ELEY, GLOUCS .GB BLACKBURN, WS C. A. PARSONS, N~CASTI~-UPON- TYNE, GB The calculation of stress intensity factors for combined tensile and shear loading. 9F,21R. INT., .FRACTURE,VII, N4, AUG .1975,P605-617 •
345 TO,KC UNIV. STRATHCLYDE, GLASGOW, GB A phenomenological theory of subcritical creep crack growth under constant loading in an inert environment. 4F,19R. INT .J .FRACTURE,Vll, N4,Ab~.1975, P641- 648. 346 OSOKIN,VV Mechanism of coal fracture due to rapid relief of external pressure. 4F,2R. SOV .MIN.SCI .Vll,Nl,JAN-FEB, 1975, P35-38.
347 OLSSON,WA BUR.MINES,TWIN CITIES,MINN.USA P~G, SS W .VIRGINIA UNIV .M~RGANTOWN, USA Microcrack nucleation in marble. 6F,30R. INT.J.ROCK MECH .MIN.SC I.GEOMECH.ABSTR .V13,N2,1976, P53 -59.
3h8 BRADY,BY Tilt precursors in rock before failure. A laboratory investigation. 5F. USBM RI 8101,1975,9P. Laboratory measurements by the Bureau of Mines indicate that failure in dry rock specimens measuring approximately 13cm in length is preceded by tilt anomalies lasting a few milliseconds. The tilt behaviour is qualitatively similar to that reported to precede earthquakes. Test results suggest that the time duration of this tilt anomaly for laboratory specimens of this length is independent of rock type, in a~reemsnt with theoretical predictions and other experimental data on rock failures including earthquakes. Auth.
349 NEC~RNKO ,BV GOLOVACH, IP ~ e physical process of pulverizir~ frozen soil with an active tiller blade. SOIL MECH .FOUND.~GNG,VI2, N3,1975, P179-180.
Strength characteristics See also abstracts:
363, 387, 428, 430, 444.
350 AKILI,W Strength behaviour of soil-asphalt mixtures in compression. 8F,2T,gR. THE HIGHWAY ~NGR,V22,NlO,OCT.1975,P9-13.
351 KUI~WY, FH SYRACUSE UNIV. SYRACUSE, USA Stress deformation properties of rock and rock discontinuities. 5F,15T,56R. ~GNG.GBOL.Vg, N4,1975, P327-350. Results of an extensive literature survey on the stress deformation properties of rock materials and discontinuities are given. The results consider (a) the range of modulus and poisson's ratio under uniaxial conditions (o) the effect of nonlinearity and stress-dependancy on the modulus under triaxial conditions (c) anisotropy of the modul~s (d) nonlinearity and stress-dependancy of poisson's ratio (e) nonlinearity a~d etress-dependancy effects on rock discontinuities.
35Z SEROTA, S LgWTH~,G A new and si~lm penetration pressure meter.3F,2T. GROL~D ENGNG,V9,NI, JAN.1976, P29-31, hO. Because of increasing ind~strialisation in the vicinity of ports, a rapid and sidle method was required to evaluate properties of the soft clqys and, accordingly, a sidle pressure meter was devised w~Lich could be pushed into the ground. The test site was Mucking Flats on the Thames Estuary. The investigation was concerned mainly with measurement of sheer strength but proving tests indicated that the instrument was also capable of measuring Young' s Modulus. 353 NADEZ~DIN, AV SOROKIN, VA Influence of pre.loading on the strength of frozen soil. SOIL MECH. FODND. ENGNG, VI2, N3,1975, P185 -186. The authors tested frozen specimens of loam under axial loading conditions aud showed that t h e effect of loading is to increase the limiting lonE-term strength of the soil, although its instantaneous strength falls.
Deformation characteristics See also abstract: 444. 354 NAGHDI, PM UNIV .CALIF .B~CELEY, USA TRAPP, JA D~r¢ .CAL~ .B~ELEY, USA The significance of f ~ l a t l u g plasticity theory with reference to loading surfaces in strain space.2F,6R. INT .J .ENGNG SCI. ,VI3,Ng-10,1975,P785-797. After observing that the classical formal~ticn of the theory of elastic-plastic materials relative to loszling surfaces in stress space ~ not be validin a region such as in the neighbourhood of ultimate strength in a simple tension test, this paper deals with am alternative develol~ent of constitutive equations for the rate of plastic strain and the rate of work.hardening relative to l o ~ n g surfaces in strain space.
342 JAGANNAE~, K IND. INST .TECHNOL.M A I ~ , IND Plastic relaxation of a shear crack at a circular inclusion. 4F,8R. INT.J. ENGNG SC I. ,V13,N7-8,1975, P725-729.
343 VARDAR, 0 ON IV. CALIF .B~KELEY, USA FINNIE, I UNIV .CALIF .B~KELEY, USA An analysis of t h e Brazilian disk fracture test using the Weibull probabilistic treatment of brittle strength. IIF, 2T, 25R. INT.J .FRACTURE,VII, N3, JUNE 1975, P495-508. It is pointed out that the Weibu11 multiaxial treatment of brittle strength contains limitations which are not present in the more familiar uniaxlal formulation. Provided these limitations are satisfied, it is possible to use tension or bending data to predict ~multiaxial bahaviour when at least one principal stress is tensile. This is illustrated for the Brazilian disc test. Predictions based on bending tests agree well with observed strength values in disc tests on two types of rocks. Auth.
344 HI~T.T.~,TK C EGB.B~{ELEY, GLOUCS .GB BLACKBURN, WS C. A. PARSONS, N~CASTI~-UPON- TYNE, GB The calculation of stress intensity factors for combined tensile and shear loading. 9F,21R. INT., .FRACTURE,VII, N4, AUG .1975,P605-617 •
345 TO,KC UNIV. STRATHCLYDE, GLASGOW, GB A phenomenological theory of subcritical creep crack growth under constant loading in an inert environment. 4F,19R. INT .J .FRACTURE,Vll, N4,Ab~.1975, P641- 648. 346 OSOKIN,VV Mechanism of coal fracture due to rapid relief of external pressure. 4F,2R. SOV .MIN.SCI .Vll,Nl,JAN-FEB, 1975, P35-38.
347 OLSSON,WA BUR.MINES,TWIN CITIES,MINN.USA P~G, SS W .VIRGINIA UNIV .M~RGANTOWN, USA Microcrack nucleation in marble. 6F,30R. INT.J.ROCK MECH .MIN.SC I.GEOMECH.ABSTR .V13,N2,1976, P53 -59.
3h8 BRADY,BY Tilt precursors in rock before failure. A laboratory investigation. 5F. USBM RI 8101,1975,9P. Laboratory measurements by the Bureau of Mines indicate that failure in dry rock specimens measuring approximately 13cm in length is preceded by tilt anomalies lasting a few milliseconds. The tilt behaviour is qualitatively similar to that reported to precede earthquakes. Test results suggest that the time duration of this tilt anomaly for laboratory specimens of this length is independent of rock type, in a~reemsnt with theoretical predictions and other experimental data on rock failures including earthquakes. Auth.
349 NEC~RNKO ,BV GOLOVACH, IP ~ e physical process of pulverizir~ frozen soil with an active tiller blade. SOIL MECH .FOUND.~GNG,VI2, N3,1975, P179-180.
Strength characteristics See also abstracts:
363, 387, 428, 430, 444.
350 AKILI,W Strength behaviour of soil-asphalt mixtures in compression. 8F,2T,gR. THE HIGHWAY ~NGR,V22,NlO,OCT.1975,P9-13.
351 KUI~WY, FH SYRACUSE UNIV. SYRACUSE, USA Stress deformation properties of rock and rock discontinuities. 5F,15T,56R. ~GNG.GBOL.Vg, N4,1975, P327-350. Results of an extensive literature survey on the stress deformation properties of rock materials and discontinuities are given. The results consider (a) the range of modulus and poisson's ratio under uniaxial conditions (o) the effect of nonlinearity and stress-dependancy on the modulus under triaxial conditions (c) anisotropy of the modul~s (d) nonlinearity and stress-dependancy of poisson's ratio (e) nonlinearity a~d etress-dependancy effects on rock discontinuities.
35Z SEROTA, S LgWTH~,G A new and si~lm penetration pressure meter.3F,2T. GROL~D ENGNG,V9,NI, JAN.1976, P29-31, hO. Because of increasing ind~strialisation in the vicinity of ports, a rapid and sidle method was required to evaluate properties of the soft clqys and, accordingly, a sidle pressure meter was devised w~Lich could be pushed into the ground. The test site was Mucking Flats on the Thames Estuary. The investigation was concerned mainly with measurement of sheer strength but proving tests indicated that the instrument was also capable of measuring Young' s Modulus. 353 NADEZ~DIN, AV SOROKIN, VA Influence of pre.loading on the strength of frozen soil. SOIL MECH. FODND. ENGNG, VI2, N3,1975, P185 -186. The authors tested frozen specimens of loam under axial loading conditions aud showed that t h e effect of loading is to increase the limiting lonE-term strength of the soil, although its instantaneous strength falls.
Deformation characteristics See also abstract: 444. 354 NAGHDI, PM UNIV .CALIF .B~CELEY, USA TRAPP, JA D~r¢ .CAL~ .B~ELEY, USA The significance of f ~ l a t l u g plasticity theory with reference to loading surfaces in strain space.2F,6R. INT .J .ENGNG SCI. ,VI3,Ng-10,1975,P785-797. After observing that the classical formal~ticn of the theory of elastic-plastic materials relative to loszling surfaces in stress space ~ not be validin a region such as in the neighbourhood of ultimate strength in a simple tension test, this paper deals with am alternative develol~ent of constitutive equations for the rate of plastic strain and the rate of work.hardening relative to l o ~ n g surfaces in strain space.