Publications
253 results found
Zimmerman RW, Somerton WH, King MS, 1986, Compressibility of porous rocks, Journal of Geophysical Research: Solid Earth, Vol: 91, Pages: 12765-12777, ISSN: 0148-0227
<jats:p>Four compressibilities are defined for porous rock, relating changes in the bulk and pore volumes to changes in the pore and confining pressures. Using a micromechanical theory based on classical linear elasticity, three relations are found between these compressibilities. Two of these relations are verified experimentally for Berea and Bandera sandstone. Bounds are derived for these compressibilities, involving only the porosity and the elastic moduli of the rockāforming minerals. For the strains to be unique functions of the stresses the compressibilities must be functions only of the difference between the confining and pore pressures. This dependence is verified for Berea, Bandera, and Boise sandstone. While the strains cannot be expressed as functions of an “effective stress,” regardless of how it is defined, the (elastic) volumetric behavior of porous rocks can be studied through tests conducted at zero pore pressure.</jats:p>
ZIMMERMAN RW, 1986, COMPRESSIBILITY OF TWO-DIMENSIONAL CAVITIES OF VARIOUS SHAPES, JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME, Vol: 53, Pages: 500-504, ISSN: 0021-8936
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- Citations: 83
ZIMMERMAN RW, KING MS, 1986, THE EFFECT OF THE EXTENT OF FREEZING ON SEISMIC VELOCITIES IN UNCONSOLIDATED PERMAFROST, GEOPHYSICS, Vol: 51, Pages: 1285-1290, ISSN: 0016-8033
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- Citations: 101
ZIMMERMAN RW, KING MS, MONTEIRO PJM, 1986, THE ELASTIC-MODULI OF MORTAR AS A POROUS-GRANULAR MATERIAL, CEMENT AND CONCRETE RESEARCH, Vol: 16, Pages: 239-245, ISSN: 0008-8846
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- Citations: 36
Zimmerman RW, 1986, Compressibility of two-dimensional cavities of various shapes, Journal of Applied Mechanics, Transactions ASME, Vol: 53, Pages: 500-504, ISSN: 0021-8936
Muskhelishvili-Kolosov complex stress functions are used to find the stresses and displacements around two-dimensional cavities under plane strain or plane stress. The boundary conditions considered are either uniform pressure at the cavity surface with vanishing stresses at infinity, or a traction-free cavity surface with uniform biaxial compression at infinity. A closed-form solution is obtained for the case where the mapping function from the interior of the unit circle to the region outside of the cavity has a finite number of terms. The area change of the cavity due to hydrostatic compression at infinity is examined for a variety of shapes, and is found to correlate closely with the square of the perimeter of the hole. © 1986 by ASME.
Zimmerman RW, 1985, COMPRESSIBILITY OF TWO-DIMENSIONAL HOLES OF VARIOUS SHAPES., Pages: 259-260, ISSN: 0419-0262
Muskhelishvili-Kolosov complex stress functions are used to study the compressibility of variously-shaped two-dimensional holes in an isotropic elastic body. Intended applications are to either thin perforated plates under in-plane loading (plane stress case), or long tubes of constant cross-section (plane strain case), which might be thought of as models of pore channels in porous rocks or ceramics. Following the approach of Sokolnikoff, the region exterior to a given simple closed curve in the z-plane is mapped conformally into the interior of the unit circle in the w-plane.
Zimmerman RW, Haraden JL, Somerton WH, 1985, EFFECTS OF PORE PRESSURE AND CONFINING PRESSURE ON PORE AND BULK VOLUME COMPRESSIBILITIES OF CONSOLIDATED SANDSTONES., Pages: 24-36, ISSN: 0066-0558
A computer-controlled system has been devised that allows measurement of pore and bulk compressibilities of porous rocks over a full range of pore and confining pressures. Pore compressibilities have been measured for Bandera, Boise, and Berea sandstones. It is shown from these data that the pore compressibilities of these sandstones are functions of the difference between the confining pressure and the pore pressure. A simple physical explanation for this behavior is then given in terms of the closure of very fine microcracks in the rock.
Zimmerman RW, King MS, 1985, PROPAGATION OF ACOUSTIC WAVES THROUGH CRACKED ROCK., Pages: 739-745, ISSN: 0085-574X
Most transport and mechanical properties of rocks, such as electrical resistivity, thermal conductivity, hydraulic permeability, compressibility, and the velocities and attenuation of acoustic waves, are strongly influenced by the presence of microcracks and fractures in the rock, and by the fluids contained in these cracks. A knowledge of the presence and properties of microcracks in rocks, and their relationship to the mechanical and transport properties, therefore has considerable practical importance. For example, the exploration for and exploitation of mineral, hydrocarbon, and geothermal resources depend on the in situ measurement of many of the physical parameters previously mentioned. The underground isolation of hazardous wastes depends on the ability to select sites where the transport properties of the rock are favorable.
Zimmerman RW, 1985, The constitutive theory for fluid-filled porous materials, Journal of Applied Mechanics, Transactions ASME, Vol: 52, ISSN: 0021-8936
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- Citations: 1
ZIMMERMAN RW, 1985, THE EFFECT OF MICROCRACKS ON THE ELASTIC-MODULI OF BRITTLE MATERIALS, JOURNAL OF MATERIALS SCIENCE LETTERS, Vol: 4, Pages: 1457-1460, ISSN: 0261-8028
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- Citations: 114
ZIMMERMAN RW, 1985, COMPRESSIBILITY OF AN ISOLATED SPHEROIDAL CAVITY IN AN ISOTROPIC ELASTIC MEDIUM, JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME, Vol: 52, Pages: 606-608, ISSN: 0021-8936
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- Citations: 16
ZIMMERMAN RW, 1984, ELASTIC-MODULI OF A SOLID WITH SPHERICAL PORES - NEW SELF-CONSISTENT METHOD, INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, Vol: 21, Pages: 339-343, ISSN: 0148-9062
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- Citations: 52
Zimmerman RW, 1982, COMPRESSIBILITIES AND EFFECTIVE STRESS COEFFICIENTS FOR LINEAR ELASTIC POROUS SOLIDS: LOWER BOUNDS AND RESULTS FOR THE CASE OF RANDOMLY DISTRIBUTED SPHEROIDAL PORES., Pages: 712-719
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