- Email: [email protected]
Sand liquefaction through volume decrease potential
77A
Dynamic properties
of temperature in sandstone and carbonate samples subjected to simulated overburden ar~ pore fluid p r e s s u r e s . There was found to be a linear relationship up to about 200C far both sets of velocities, with an average decrease in compression wave velocity of 1.7 per cent and in shear wave velocity of 0.9 per cent for a 100 degree rise in temperature.
784058 EFFECT OF MULTIDIRECTIONAL SHAKING ON PORE PRESSURE DEVELOPMENT IN SANDS Seed, H B; Pyke, R M; Martin, G R J Geotech E z ~ Div ASCE, V104, NGT1, Jan 1978, P27-h/~ The effect is estimated using previous results of multidirectional shaking table tests that measured t h e s e t t l e m e n t of dry sand and a model of the mechanism of liquefaction of saturated samds that uses data obtained in cyclic simple sheer tests on dry sand. It is shown that excess pore pressures may develop twice as fast trader two equal horizontal components of motion than is the case under a single component, but that a reduction of only l0 per cent in the shear stresses causing liquefaction is normally adequate to account for the effect of multidirectional shaking in analyses of liquefaction potential. 784059 DYNAMIC SHEAR MCDULUS OF SOIL USING A RANDOM VIBRATION METHOD Yong, R N; Akiyoahl, T; Japp, R D Soils Found, V17, N1, March 1977, Pl-12 Reports experiments on the random vibration method using the apparatus developed by Hardin, and compares results with the atandard sinusoidal test. 784060 SAND LIQUEFACTION THROUGH VOLUME DECREASE POTEhrflAL Ishihara, K; Watanabe, T Soils Found, V16, N4, Dec 1976, P61-70 Reports cyclic triaxial shear tests and relates liquefaction potential to volmme decrease potential, defined as the difference between the current and minimum void ratios. Presents design curves to enable this potential to be estimated from SPY results. 784061 S Y S ~ I C BEHAVIOUR OF COMPRESSIONAL VELOCITY IN FRANCISCAN ROCKS AT HIGH PRESSURE AND T ~ FERATURE Stewart, R; Peselnlck, L J Geophys Res, 783, NB2, l0 Feb 1978, P831-
839 Reports measur~nents on 14 dry rocks ranging from zeolite facies sardstone to jadeitized metagraywacke at temperatures up to 300C and pressures up to 8 kbar. 784062 CHANGES IN SEISMIC VELOCITY AND ATTENUATION DURING DEFORMATION OF GRAI~ITE Lockn~, D A; Walsh, J B; Byerlee, J D J Geophys Res, V82, N33, I0 Nov 1977, P53745378 Reports lab tests and analyses the results in terms of the effect of anlsotroplc crack distribution developed in the sample as axial stress is applied on the elastic modulus and energy dissipation due to frictional sliding at cracks. 784063 TEMPERATURE DEPENDENCE OF CCMPRESSIONAL AND SHEAR WAVE VELOCITIES IN ROCKS Timur, A Geol~hysics, 742, N5, Aug 1977, P950-956 Concurrent measurements were made of eompressional and shesr wave velocities as functions
784064 DYNAMIC RESPONSE OF FROZEN GROUND Finn, W D L; Yong, R N Paper to Specialty Session, ASCE Fall Conven tion and Exhibit, San Francisco, 17-21 Oct 1977. Preprints, P1-95
783065
PARAMETER EFFECTS ON DYNAMIC PROPERTIES OF FROZEN SOILS Vinson, T S Paper to Specialty Session, ASCE Fall Conven tion and Exhibit, San Francisco, 17-21 Oct 1977. Preprints, Pll2-140
Geology Earthquake mechanisms and effects 784066 FAULT CREEP AND STRESS DROPS IN SATURATED SILT CLAY GOUGE Bombolakis, E G; HepburnI J C; Roy, D C J Geophys Res, 783, NB2, l0 Feb 1978, P818-
83O An analysis of physicochemical processes in saturated silt-clay gouge indicates that this type of fault zone material can account for th following phenomena: (1) the nonlinear mechanical behaviour indicated by certain geophysica measurements along the San Andreas fault zone, (2) the low stress drops associated with earth quakes to several kilometers depth, and (3) th recurrence of creep-lnduced instabilities at shallow depths along fault zones. 784O67 FAULT P I ~ WITH BARRIERS : A VERSATILE EARTHQUAKE MODEL Das, S; Aki, K J Geophys Res, V82, N36, l0 Dec 1977 , P56585670 Describes n~nerical experiments on rul~ure propagation over the fault plane with distributed barriers, and applies the results to a variety of observations including rock bursts, earthquakes and ~fterahocks. 784068 SEI~ICITY IN THE VICINITY OF THE FARALLON ESCARPMEN2 Uhrhanm~er, R Geophys Res Lett, V4, NI0, Oct 1977, P469-47' The epicentre of a small earthquake was locat~ on April 30th 1977 along the continental slopej about 25 km west of the Farallon Islands. This establishes earthquake activity along the continental margin as far as 65 km west of the S~ Andreas fault, and signifies that the active seismic zone exterds here to the edge of the continental margin, but not past it into the oceanic crust. The occurrence rate is very low and the inter-occurrence time is about 2 years. The first motions recorded are consistent with a right-lateral strlke-slip mechanism orientate parallel to the strike of the San Andreas fault
Dynamic properties
of temperature in sandstone and carbonate samples subjected to simulated overburden ar~ pore fluid p r e s s u r e s . There was found to be a linear relationship up to about 200C far both sets of velocities, with an average decrease in compression wave velocity of 1.7 per cent and in shear wave velocity of 0.9 per cent for a 100 degree rise in temperature.
784058 EFFECT OF MULTIDIRECTIONAL SHAKING ON PORE PRESSURE DEVELOPMENT IN SANDS Seed, H B; Pyke, R M; Martin, G R J Geotech E z ~ Div ASCE, V104, NGT1, Jan 1978, P27-h/~ The effect is estimated using previous results of multidirectional shaking table tests that measured t h e s e t t l e m e n t of dry sand and a model of the mechanism of liquefaction of saturated samds that uses data obtained in cyclic simple sheer tests on dry sand. It is shown that excess pore pressures may develop twice as fast trader two equal horizontal components of motion than is the case under a single component, but that a reduction of only l0 per cent in the shear stresses causing liquefaction is normally adequate to account for the effect of multidirectional shaking in analyses of liquefaction potential. 784059 DYNAMIC SHEAR MCDULUS OF SOIL USING A RANDOM VIBRATION METHOD Yong, R N; Akiyoahl, T; Japp, R D Soils Found, V17, N1, March 1977, Pl-12 Reports experiments on the random vibration method using the apparatus developed by Hardin, and compares results with the atandard sinusoidal test. 784060 SAND LIQUEFACTION THROUGH VOLUME DECREASE POTEhrflAL Ishihara, K; Watanabe, T Soils Found, V16, N4, Dec 1976, P61-70 Reports cyclic triaxial shear tests and relates liquefaction potential to volmme decrease potential, defined as the difference between the current and minimum void ratios. Presents design curves to enable this potential to be estimated from SPY results. 784061 S Y S ~ I C BEHAVIOUR OF COMPRESSIONAL VELOCITY IN FRANCISCAN ROCKS AT HIGH PRESSURE AND T ~ FERATURE Stewart, R; Peselnlck, L J Geophys Res, 783, NB2, l0 Feb 1978, P831-
839 Reports measur~nents on 14 dry rocks ranging from zeolite facies sardstone to jadeitized metagraywacke at temperatures up to 300C and pressures up to 8 kbar. 784062 CHANGES IN SEISMIC VELOCITY AND ATTENUATION DURING DEFORMATION OF GRAI~ITE Lockn~, D A; Walsh, J B; Byerlee, J D J Geophys Res, V82, N33, I0 Nov 1977, P53745378 Reports lab tests and analyses the results in terms of the effect of anlsotroplc crack distribution developed in the sample as axial stress is applied on the elastic modulus and energy dissipation due to frictional sliding at cracks. 784063 TEMPERATURE DEPENDENCE OF CCMPRESSIONAL AND SHEAR WAVE VELOCITIES IN ROCKS Timur, A Geol~hysics, 742, N5, Aug 1977, P950-956 Concurrent measurements were made of eompressional and shesr wave velocities as functions
784064 DYNAMIC RESPONSE OF FROZEN GROUND Finn, W D L; Yong, R N Paper to Specialty Session, ASCE Fall Conven tion and Exhibit, San Francisco, 17-21 Oct 1977. Preprints, P1-95
783065
PARAMETER EFFECTS ON DYNAMIC PROPERTIES OF FROZEN SOILS Vinson, T S Paper to Specialty Session, ASCE Fall Conven tion and Exhibit, San Francisco, 17-21 Oct 1977. Preprints, Pll2-140
Geology Earthquake mechanisms and effects 784066 FAULT CREEP AND STRESS DROPS IN SATURATED SILT CLAY GOUGE Bombolakis, E G; HepburnI J C; Roy, D C J Geophys Res, 783, NB2, l0 Feb 1978, P818-
83O An analysis of physicochemical processes in saturated silt-clay gouge indicates that this type of fault zone material can account for th following phenomena: (1) the nonlinear mechanical behaviour indicated by certain geophysica measurements along the San Andreas fault zone, (2) the low stress drops associated with earth quakes to several kilometers depth, and (3) th recurrence of creep-lnduced instabilities at shallow depths along fault zones. 784O67 FAULT P I ~ WITH BARRIERS : A VERSATILE EARTHQUAKE MODEL Das, S; Aki, K J Geophys Res, V82, N36, l0 Dec 1977 , P56585670 Describes n~nerical experiments on rul~ure propagation over the fault plane with distributed barriers, and applies the results to a variety of observations including rock bursts, earthquakes and ~fterahocks. 784068 SEI~ICITY IN THE VICINITY OF THE FARALLON ESCARPMEN2 Uhrhanm~er, R Geophys Res Lett, V4, NI0, Oct 1977, P469-47' The epicentre of a small earthquake was locat~ on April 30th 1977 along the continental slopej about 25 km west of the Farallon Islands. This establishes earthquake activity along the continental margin as far as 65 km west of the S~ Andreas fault, and signifies that the active seismic zone exterds here to the edge of the continental margin, but not past it into the oceanic crust. The occurrence rate is very low and the inter-occurrence time is about 2 years. The first motions recorded are consistent with a right-lateral strlke-slip mechanism orientate parallel to the strike of the San Andreas fault