- Email: [email protected]
Gravitational stresses in anisotropic rock masses
138A 874072 Method for estimating the compressibility factor of a glacial till and its use in pavement design Brennan, M J; Ryan, K Proc International Conference on Construction in Glacial Tills and Boulder Clays, Edinburgh, 12-14 March 1985 P71-73. Publ Edinburgh: Engineering Technics Press. 1985 The bearing capacity of a subgrade is dependent on its equilibrium moisture content after the pavement has been built. A method has been developed to overcome difficulties in estimating the equilibrium moisture content for pavements with shallow water table depths. This technique requires knowledge of the compressibility factor of the soil. A simple laboratory technique to measure this factor is described. Examples presented show how pavement thicknesses based on the equilibrium moisture content differ from those based on in situ moisture content or plastic indices of tills. 874073 Precision of the moisture condition test Parsons, A W; Toombs, A F Transport Road Research Laboratory Research report N90, 1987, 19P The moisture condition test (Parsons, 1976), where the number of blows of a rammer required to bring a sample of soil to a state of near full compaction is determined, was developed as a method of assessing the suitability of earthwork material as embankment fill. Reproducibility and repeatability were examined by measuring MCV for two soils, a heavy clay and a well graded sand, at four different test levels in ten independent laboratories. Results are presented and discussed. Difficulties in the test procedures and problems with the apparatus are highlighted and improvements suggested.
Dynamic properties 874074 Effect of porosity and clay content on wave velocities in sandstones Han, D H; Nur, A; Morgan, D Geophysics V51, Nll, Nov 1986, P2093-2107 Compressional velocity and shear velocity were measured as functions of pressure in 75 sandstone samples with varying clay contents and porosities. The relations among changes in relative attenuation of waves with varying rock porosity and clay content were also investigated, as were the relations among the velocity ratio, water saturation, elastic moduli, porosity and clay content: Gassmann's equation was used to explore the frequency dependence of rock elasticity as proposed by Winkler. 874075 Vibration in rock and soil. Norwegian practice regarding damage criteria and ground vibration limits in urban areas By, T L Norw Geotech lnst Publ N164, 1986, 5P
874076 Liquefaction test without membrane penetration effects Tokimatsu, K; Nakamura, K Soils Found V26, N4. Dec 1986. P127-138 A test system has been developed to perform constant volume shear tests in which membrane penetration effects for granular soils are compensated for in real time. It is relatively simple and inexpensive and can be coupled to conventional test apparatus. The system was used to investigate membrane compliance effects during cyclic loading tests on sands. There was no effect at mean grain diameter 0.17ram, but if this was increased to 1.0mm shear stress ratios to cause liquefaction were overestimated by about 30% because of membrane penetration. Theoretical analyses of other workers are consistent with these results. 874077 Engineering rock characterization for the analysis of blasting waves Agioutantis, Z: Karmis, M Proc Symposium on Application of Rock Characterization Techniques in Mine Design, New Orleans, March 1986 P196206. Publ Littleton: AIME. 1986 Blasting and vibration data were collected from several granite and limestone quarries and the possible interrelating factors were examined using statistical analysis techniques. Models employing the scaled distance concept were developed and subsequently selected for further analysis which included the introduction and incorporation of geostatistical parameters. 874078 Case study of the Nakaba liquefied landslide Hiura, H; Sassa, K; Kitera, N; Ohte, K Proc 4th International Conference and Field Workshop on Landslides, Japan,23-31 Aug 1985 P299-304. Publ Tokyo." Japan Landslide Society, 1985 The landslide at Nakaba in Hamada city, Japan, is studied as a case study of the sudden liquefaction type landslide. Soils sampled at the landslide were examined using load controlled triaxial compression testing. As a result, the most important parameter for liquefaction was shown to be the grain size distribution Lack of relatively finer grains leads to liquefaction on rapid loading. In the case of the Nakaba landslide, it is believed the slide was caused by the liquefaction.
In Situ Stress Causes and nature of in situ stress 874079 Gravitational stresses in anisotropic rock masses Amadei, B; Savage, W Z; Swolfs, H S lnt J Rock Mech Min Sci V24. N1. Feb 1987, P5-14
Closed form solutions are proposed for the stress field induced The frequency dependence of ground and structural response by gravity in anisotropic rock masses. The models proposed is an important factor in specifying maximum vibration levels. - show that the nature of the stress field induced in anisotropic Response of simple and complex structures, ground vibration or transversely isotropic rock masses under gravity and vanlimitation, and instrument specifications are discussed. ishing horizontal displacements depends upon the type and Attempts are made to calculate the maximum acceptable magnitude of the rock mass anisotropy and the orientation of the rock mass defects and structure with respect to the ground blasting charge in terms of distance, ground properties, and structural response. Ground vibration limits are specified with surface. This has been previously observed, but not explicity quantified. frequency and structural components. 'D 1987 Pergamon Journals Ltd. Reproduction not permitted
Dynamic properties 874074 Effect of porosity and clay content on wave velocities in sandstones Han, D H; Nur, A; Morgan, D Geophysics V51, Nll, Nov 1986, P2093-2107 Compressional velocity and shear velocity were measured as functions of pressure in 75 sandstone samples with varying clay contents and porosities. The relations among changes in relative attenuation of waves with varying rock porosity and clay content were also investigated, as were the relations among the velocity ratio, water saturation, elastic moduli, porosity and clay content: Gassmann's equation was used to explore the frequency dependence of rock elasticity as proposed by Winkler. 874075 Vibration in rock and soil. Norwegian practice regarding damage criteria and ground vibration limits in urban areas By, T L Norw Geotech lnst Publ N164, 1986, 5P
874076 Liquefaction test without membrane penetration effects Tokimatsu, K; Nakamura, K Soils Found V26, N4. Dec 1986. P127-138 A test system has been developed to perform constant volume shear tests in which membrane penetration effects for granular soils are compensated for in real time. It is relatively simple and inexpensive and can be coupled to conventional test apparatus. The system was used to investigate membrane compliance effects during cyclic loading tests on sands. There was no effect at mean grain diameter 0.17ram, but if this was increased to 1.0mm shear stress ratios to cause liquefaction were overestimated by about 30% because of membrane penetration. Theoretical analyses of other workers are consistent with these results. 874077 Engineering rock characterization for the analysis of blasting waves Agioutantis, Z: Karmis, M Proc Symposium on Application of Rock Characterization Techniques in Mine Design, New Orleans, March 1986 P196206. Publ Littleton: AIME. 1986 Blasting and vibration data were collected from several granite and limestone quarries and the possible interrelating factors were examined using statistical analysis techniques. Models employing the scaled distance concept were developed and subsequently selected for further analysis which included the introduction and incorporation of geostatistical parameters. 874078 Case study of the Nakaba liquefied landslide Hiura, H; Sassa, K; Kitera, N; Ohte, K Proc 4th International Conference and Field Workshop on Landslides, Japan,23-31 Aug 1985 P299-304. Publ Tokyo." Japan Landslide Society, 1985 The landslide at Nakaba in Hamada city, Japan, is studied as a case study of the sudden liquefaction type landslide. Soils sampled at the landslide were examined using load controlled triaxial compression testing. As a result, the most important parameter for liquefaction was shown to be the grain size distribution Lack of relatively finer grains leads to liquefaction on rapid loading. In the case of the Nakaba landslide, it is believed the slide was caused by the liquefaction.
In Situ Stress Causes and nature of in situ stress 874079 Gravitational stresses in anisotropic rock masses Amadei, B; Savage, W Z; Swolfs, H S lnt J Rock Mech Min Sci V24. N1. Feb 1987, P5-14
Closed form solutions are proposed for the stress field induced The frequency dependence of ground and structural response by gravity in anisotropic rock masses. The models proposed is an important factor in specifying maximum vibration levels. - show that the nature of the stress field induced in anisotropic Response of simple and complex structures, ground vibration or transversely isotropic rock masses under gravity and vanlimitation, and instrument specifications are discussed. ishing horizontal displacements depends upon the type and Attempts are made to calculate the maximum acceptable magnitude of the rock mass anisotropy and the orientation of the rock mass defects and structure with respect to the ground blasting charge in terms of distance, ground properties, and structural response. Ground vibration limits are specified with surface. This has been previously observed, but not explicity quantified. frequency and structural components. 'D 1987 Pergamon Journals Ltd. Reproduction not permitted