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Classification of mudrocks for engineering purposes
I I9A takes climatic factors into account, is used. This is applied to nine rock types which might be considered for aggregates. 854095 Over-estimation of clay and under-estimation of pores in thin soil sections Murphy, C P; Kemp, R A
J Soil Sci V35, N3, Sept 1984, P481-495 Clay contents of thin soil sections, estimated visually or by point counting, were significantly greater than those determined gravimetrically. This is explained in terms of sub-microscopic porosity which goes unobserved and edge effects causing masking of sub-surface porosity. A nomogram is constructed, using apparent density, to allow for estimation of clay in thin sections of soils. 854096 Classification of mudrocks for engineering purposes Grainger, P
Q J Engng Geol V17, N4, P381-387 854097 Identification of loess by particle size distribution using the Coulter Counter TA 1I Miller, B J
854100 Intraplate extensional tectonics of the Eastern Basin Range: inferences on structural style from seismic reflection data, regional tectonics, and thermal mechanical models of brittleductile deformation Smith, R B; Bruhn, R k
J Geophys Res V89, NBT, July 1984, P5733-5762 The geometry, structural style and fault mechanism of the Eastern Basin Range, Colorado, USA. have been evaluated from semisic data. Particular attention has been given to: (1) geometry of extensional faults as inferred from surface geology and seismic data; (2) seismic characteristics of steeply dipping faults and low-angle detachments; (3) relationship between steeply dipping fault scarps on the surface and subsurface fault geometry; and (4) rheological properties of the continental crust and their relation to extensional tectonic mechanisms. 854101 Role of an intracrustal asthenosphere on the behavior of major strike-slip faults Turcotte, D L; Liu, J Y; Kulhawy, F H J Geophys Res V89, NBT, July 1984, P5801-5816
Using the Coulter Counter particle size can be determined in the silt size range with 15 subdivisions. The technique can be widely used in soil classification studies.
A four layer model is proposed for the San Andreas fault, which can explain the narrow zone of strain accumulation around it. and is consistent with other observations, including a relatively thick lithosphere. Beneath the upper elastic plate is a viscoelastic layer, which is attributed to presence of quartz or to pressure solution creep, and beneath this is a second elastic layer and an intercrustal asthenosphere.
854098 Microtrac particle size analyzer: an alternative particle size determination method for sediment and soils Cooper, L R; Haverland, R L; Hendricks, D M; Knisel, W G
854102 Effects of physical fault properties on frictional instabilities produced on simulated faults Okubo, P G; Dieterich, J H
Soil Sci V138, N2, Aug 1984, P138-146
J Geophys Res V89, NB7, July 1984, P5817-5827
The Microtrac particle size analyser measures by low-angle forward scattering of laser light that has passed through a sample cell. It is compared with the conventional sieve-pipette method of particle-size analysis. Regression analysis may be used to convert Microtrac results to those of the sieve-pipette method with reasonable accuracy. Major advantages of the Microtrac method are speed of measurement, small sample requirements and speed at which results are presented in a usable form,
Laboratory studies on a 2m long simulated fault have shown stick-slip shear behaviour to be influenced by normal stress and fault roughness. Recording of stresses and displacements allowed examination of local breakdown as the failure spreads over the fault. Dynamic source parameters of the events are examined. The relatively large scale of the experiment permitted examination of some length scaling factors.
Soil Sci V137, N3, March 1984, P172-176
Geology Tectonic processes 854099 Friction, faulting, and 'in situ' stress Zoback, M D; Healy, J H Ann Geophys I/2, N6, Nov-Dec 1984, P689-698 In situ stress measurements, made by the hydraulic fracturing methods at depth in active faulting areas, were used to estimate the frictional strength of the rocks. Normal faulting, shallow reverse faulting and strike slip faulting were investigated, Data indicate that laboratory derived coefficients of friction in the range 0.6-1.0 seem to apply to most faults in situ. For areas of active faulting, the magnitude of the principal stress differences in the shallow crust are dependent upon the frictional strength of the active faults.
854103 Constitutive relations for fault slip and earthquake instabilities Rice, J R
Pure Appl Geophys V121, N3, 1983, P443-475 A review of fault instability modelling. The slip-weakening model, where strength of a segment degrades with ongoing slip, and a model taking into account applied slip rate and surface state dependent relations are reviewed. Models of crustal faults from a simple, single degree of freedom spring-slider system to complex continuous systems are described. 43 refs. 854104 Displacement and stress fields due to nonuniform slip along a strike slip fault Wang, R; Wu, H L
Pure Appl Geophys VI21, N4, 1983, P601-609 A closed-form analytic solution for the displacement and stress field due to a trapezoidal type of nonuniform slip along a strike slip fault is obtained by following Steketee's method of integration. A set of displacement and stress contours are plotted and compared with the corresponding cases of uniform slip. A possible explanation of the equidistance distribution of strike slip faults and its relation to the amount of slip and the dimensions of the fault are shown. Auth.
J Soil Sci V35, N3, Sept 1984, P481-495 Clay contents of thin soil sections, estimated visually or by point counting, were significantly greater than those determined gravimetrically. This is explained in terms of sub-microscopic porosity which goes unobserved and edge effects causing masking of sub-surface porosity. A nomogram is constructed, using apparent density, to allow for estimation of clay in thin sections of soils. 854096 Classification of mudrocks for engineering purposes Grainger, P
Q J Engng Geol V17, N4, P381-387 854097 Identification of loess by particle size distribution using the Coulter Counter TA 1I Miller, B J
854100 Intraplate extensional tectonics of the Eastern Basin Range: inferences on structural style from seismic reflection data, regional tectonics, and thermal mechanical models of brittleductile deformation Smith, R B; Bruhn, R k
J Geophys Res V89, NBT, July 1984, P5733-5762 The geometry, structural style and fault mechanism of the Eastern Basin Range, Colorado, USA. have been evaluated from semisic data. Particular attention has been given to: (1) geometry of extensional faults as inferred from surface geology and seismic data; (2) seismic characteristics of steeply dipping faults and low-angle detachments; (3) relationship between steeply dipping fault scarps on the surface and subsurface fault geometry; and (4) rheological properties of the continental crust and their relation to extensional tectonic mechanisms. 854101 Role of an intracrustal asthenosphere on the behavior of major strike-slip faults Turcotte, D L; Liu, J Y; Kulhawy, F H J Geophys Res V89, NBT, July 1984, P5801-5816
Using the Coulter Counter particle size can be determined in the silt size range with 15 subdivisions. The technique can be widely used in soil classification studies.
A four layer model is proposed for the San Andreas fault, which can explain the narrow zone of strain accumulation around it. and is consistent with other observations, including a relatively thick lithosphere. Beneath the upper elastic plate is a viscoelastic layer, which is attributed to presence of quartz or to pressure solution creep, and beneath this is a second elastic layer and an intercrustal asthenosphere.
854098 Microtrac particle size analyzer: an alternative particle size determination method for sediment and soils Cooper, L R; Haverland, R L; Hendricks, D M; Knisel, W G
854102 Effects of physical fault properties on frictional instabilities produced on simulated faults Okubo, P G; Dieterich, J H
Soil Sci V138, N2, Aug 1984, P138-146
J Geophys Res V89, NB7, July 1984, P5817-5827
The Microtrac particle size analyser measures by low-angle forward scattering of laser light that has passed through a sample cell. It is compared with the conventional sieve-pipette method of particle-size analysis. Regression analysis may be used to convert Microtrac results to those of the sieve-pipette method with reasonable accuracy. Major advantages of the Microtrac method are speed of measurement, small sample requirements and speed at which results are presented in a usable form,
Laboratory studies on a 2m long simulated fault have shown stick-slip shear behaviour to be influenced by normal stress and fault roughness. Recording of stresses and displacements allowed examination of local breakdown as the failure spreads over the fault. Dynamic source parameters of the events are examined. The relatively large scale of the experiment permitted examination of some length scaling factors.
Soil Sci V137, N3, March 1984, P172-176
Geology Tectonic processes 854099 Friction, faulting, and 'in situ' stress Zoback, M D; Healy, J H Ann Geophys I/2, N6, Nov-Dec 1984, P689-698 In situ stress measurements, made by the hydraulic fracturing methods at depth in active faulting areas, were used to estimate the frictional strength of the rocks. Normal faulting, shallow reverse faulting and strike slip faulting were investigated, Data indicate that laboratory derived coefficients of friction in the range 0.6-1.0 seem to apply to most faults in situ. For areas of active faulting, the magnitude of the principal stress differences in the shallow crust are dependent upon the frictional strength of the active faults.
854103 Constitutive relations for fault slip and earthquake instabilities Rice, J R
Pure Appl Geophys V121, N3, 1983, P443-475 A review of fault instability modelling. The slip-weakening model, where strength of a segment degrades with ongoing slip, and a model taking into account applied slip rate and surface state dependent relations are reviewed. Models of crustal faults from a simple, single degree of freedom spring-slider system to complex continuous systems are described. 43 refs. 854104 Displacement and stress fields due to nonuniform slip along a strike slip fault Wang, R; Wu, H L
Pure Appl Geophys VI21, N4, 1983, P601-609 A closed-form analytic solution for the displacement and stress field due to a trapezoidal type of nonuniform slip along a strike slip fault is obtained by following Steketee's method of integration. A set of displacement and stress contours are plotted and compared with the corresponding cases of uniform slip. A possible explanation of the equidistance distribution of strike slip faults and its relation to the amount of slip and the dimensions of the fault are shown. Auth.