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Some aspects of the engineering geological properties of swelling and slaking mudrocks
285A 915157 T~odiimensioarl swell theory for expruroivechW Ramana Murthy, C V, Srirama Rao, A proc Z&an Georechnical Conferecl)cc, 1989, Geotechniques of fioblrnrotic Soils and Rocks, Visaklurpctn~, 14-16 December 1989 VI, P191-193. Pub1 New Delhi: Sarita Prakashan, 1989 A mathematical model is presented for two dimensional swell of expansive soils, formulated using polar coordinates. Transient flow equations are coupled with equations of equilibrium for the analysis. An isotropic, homogeneous, linear medium, in which Darcy’s law holds for flow of water and Fick’s law for flow of air, with small strains, matric suction only, and a continuous air phase are the necessary assumptions.
915158 Pressuremeter holding tests in a calibration chamber Huang, A B; Holtz, R D; Chameau, J L Proc 3rd International Symposium on Pressuremeters, Oxford, 2-6 April 1990 P253-262. Pub1 London: Thomas TelJbrd, 1990 In order to validate the holding test concept, the technique used to determine the horizontal consolidation characteristics using a self-boring pressuremeter, a series of one-eighth scale model pressuremeter tests was performed in a calibration chamber. Reference oedometer tests were performed on the same soil in the vertical and horizontal directions. The theoretical background of the holding tests, results of the chamber and reference experiments, and their validity and practical implications are reviewed.
915159 Geology and pedology related to collapsible soils in Pemnmbuco - Brazil Ferreira, S R M Z’roc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI, P617-621. Pub1 Rotterdam: A A Balkema, 1990 Many problems have been found in housing and irrigation projects in northeastern Brazil due to soil collapse. Field and laboratory examinations of geological and pedalogical characteristics were undertaken. The relative collapsibility of the soils, and their parent rocks are described. Sites further from the coast showed greater collapse potential.
915160 Some aspects of the engineering geological properties of swelling and slaking mudrocks Olivier, H J Z+oc 6th International Congress Znternational Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI. P707-712. Pubf Rotterdam: A A Balkema. 1990 Most mudrocks will deteriorate on exposure to the atmosphere, but timely preventative measures can control this deterioration. Assessment of durability is therefore of considerable engineering importance. Characteristics and underlying mechanisms influencing the long term behaviour of potentially swelling and slaking mudrocks are discussed. A rock durability classification which has been used successfully to predict behaviour of rocks of the Karoo sequence of South Africa is described. 0
915161 Collapse Mtlemeni of old chalk fill at Brighton Stroud, M A; Mitchell, J M Proc Znternational Chalk Symposium, Brighton, 4-7 September 1989 P343-350. Pub1 London: Thomas Telford, 1990 The loss of strength of chalk when in contact with water has been suggested as the cause of deterioration and collapse of chalk fill. Site investigations were conducted in order to investigate the collapse of a 100 year old chalk fill during the construction of an industrial estate in Brighton. Although a stone column had been constructed to improve the fill, the investigations indicate that it did very little to compact the chalk fill. Details of the investigations, the obtained results and the effects of water, sand and gravel fill are presented.
Dynamic properties See also: 915017, 915198, 915238. 915280,915281,915434 915162 Dynamic analysis of saturated non linear media Aubry, D; Modaressi, H In: Numerieal Methods and Constitutive MoaWing in Geomechanics (Znternational Centre for Mechanical Sciences, Courses and Lectures - No 311) P211-235. Pub1 Wien: Springer- Verlag, 1990 Numerical modelling of wave propagation in porous media is addressed. Two models similar to that derived by Biot are described, and numerical implementation using a variational formulation and a finite element approach for the solid and fluid phases is discussed. Discretization with respect to time may be carried out using a mixed implicit-explicit approach, combining the advantages of each technique. Seismic loading in the form of a propagation free field is modelled. 915163 Seismic rays in media with slight lateral variation in velocity Moore, B J Geophys J V105, Nl. April 1991, P213-227 The effect on the propagation of seismic waves through a layer of fixed thickness of having weak lateral inhomogeneities superimposed on an unperturbed velocity field which varies with depth only is examined using the method of small perturbations. Results are presented and discussed with particular reference to estimating and accounting for lateral velocity inhomogeneity in the upper earth crust observed in reflection seismics. 915164 Pore-filling material and its effect on velocity in rocks Marion, D; Nur, A Geophysics V56, N2. Feb 1991, P22S-230 The Bound Averaging Method is presented for estimating the dependency of P and S wave velocity in rocks on the elastic properties of the pore filling materials. It extends Gassmann’s relations to the case of pore filling material with non-zero shear strength. It is tested against laboratory measurements and Gassmann’s relation for determining the velocities in water saturated rocks using values for dry rocks as input data. It is used to estimate temperature dependence of velocity of rocks saturated with heavy hydrocarbons and of permafrost rocks during solid-liquid phase change.
1991 Pergamon Press plc. Reproduction
not permitted
915158 Pressuremeter holding tests in a calibration chamber Huang, A B; Holtz, R D; Chameau, J L Proc 3rd International Symposium on Pressuremeters, Oxford, 2-6 April 1990 P253-262. Pub1 London: Thomas TelJbrd, 1990 In order to validate the holding test concept, the technique used to determine the horizontal consolidation characteristics using a self-boring pressuremeter, a series of one-eighth scale model pressuremeter tests was performed in a calibration chamber. Reference oedometer tests were performed on the same soil in the vertical and horizontal directions. The theoretical background of the holding tests, results of the chamber and reference experiments, and their validity and practical implications are reviewed.
915159 Geology and pedology related to collapsible soils in Pemnmbuco - Brazil Ferreira, S R M Z’roc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI, P617-621. Pub1 Rotterdam: A A Balkema, 1990 Many problems have been found in housing and irrigation projects in northeastern Brazil due to soil collapse. Field and laboratory examinations of geological and pedalogical characteristics were undertaken. The relative collapsibility of the soils, and their parent rocks are described. Sites further from the coast showed greater collapse potential.
915160 Some aspects of the engineering geological properties of swelling and slaking mudrocks Olivier, H J Z+oc 6th International Congress Znternational Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI. P707-712. Pubf Rotterdam: A A Balkema. 1990 Most mudrocks will deteriorate on exposure to the atmosphere, but timely preventative measures can control this deterioration. Assessment of durability is therefore of considerable engineering importance. Characteristics and underlying mechanisms influencing the long term behaviour of potentially swelling and slaking mudrocks are discussed. A rock durability classification which has been used successfully to predict behaviour of rocks of the Karoo sequence of South Africa is described. 0
915161 Collapse Mtlemeni of old chalk fill at Brighton Stroud, M A; Mitchell, J M Proc Znternational Chalk Symposium, Brighton, 4-7 September 1989 P343-350. Pub1 London: Thomas Telford, 1990 The loss of strength of chalk when in contact with water has been suggested as the cause of deterioration and collapse of chalk fill. Site investigations were conducted in order to investigate the collapse of a 100 year old chalk fill during the construction of an industrial estate in Brighton. Although a stone column had been constructed to improve the fill, the investigations indicate that it did very little to compact the chalk fill. Details of the investigations, the obtained results and the effects of water, sand and gravel fill are presented.
Dynamic properties See also: 915017, 915198, 915238. 915280,915281,915434 915162 Dynamic analysis of saturated non linear media Aubry, D; Modaressi, H In: Numerieal Methods and Constitutive MoaWing in Geomechanics (Znternational Centre for Mechanical Sciences, Courses and Lectures - No 311) P211-235. Pub1 Wien: Springer- Verlag, 1990 Numerical modelling of wave propagation in porous media is addressed. Two models similar to that derived by Biot are described, and numerical implementation using a variational formulation and a finite element approach for the solid and fluid phases is discussed. Discretization with respect to time may be carried out using a mixed implicit-explicit approach, combining the advantages of each technique. Seismic loading in the form of a propagation free field is modelled. 915163 Seismic rays in media with slight lateral variation in velocity Moore, B J Geophys J V105, Nl. April 1991, P213-227 The effect on the propagation of seismic waves through a layer of fixed thickness of having weak lateral inhomogeneities superimposed on an unperturbed velocity field which varies with depth only is examined using the method of small perturbations. Results are presented and discussed with particular reference to estimating and accounting for lateral velocity inhomogeneity in the upper earth crust observed in reflection seismics. 915164 Pore-filling material and its effect on velocity in rocks Marion, D; Nur, A Geophysics V56, N2. Feb 1991, P22S-230 The Bound Averaging Method is presented for estimating the dependency of P and S wave velocity in rocks on the elastic properties of the pore filling materials. It extends Gassmann’s relations to the case of pore filling material with non-zero shear strength. It is tested against laboratory measurements and Gassmann’s relation for determining the velocities in water saturated rocks using values for dry rocks as input data. It is used to estimate temperature dependence of velocity of rocks saturated with heavy hydrocarbons and of permafrost rocks during solid-liquid phase change.
1991 Pergamon Press plc. Reproduction
not permitted