Browsing by Author "Tarokh, Ali"
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Item Experimental data on pore moduli of porous rock(2018-04-06) Tarokh, Ali; Labuz, Joseph F; jlabuz@umn.edu; Labuz, Joseph F; Rock Mechanics Laboratory, Department of Civil, Environmental, and Geo- Engineering, University of MinnesotaThese data address two key questions: (i) is Ks'' a constant and (ii) under what conditions does Ks'' = Ks hold. We present unique laboratory experiments that enable the direct measurement of Ks'', for the first time, for ideal and natural porous solids.Item Experimental data on poroelastic moduli of transversely isotropic rock(2021-12-25) Tarokh, Ali; Labuz, Joseph F; jlabuz@umn.edu; Labuz, Joseph F; Rock Mechanics Laboratory, Department of Civil, Environmental, and Geo- Engineering, University of MinnesotaThese data present volumetric and deviatoric poroelastic moduli from a series of drained, undrained, and unjacketed tests in uniaxial, hydrostatic, and axisymmetric compression for a porous sandstone. These data enable the direct and independent measurement of all eight parameters that fully describe the mechanical response of a transversely isotropic rock.Item Poroelastic response of saturated rock(2016-12) Tarokh, AliThe existence of fluid in porous medium affects its mechanical response. Changes in pore pressure, defined as the pressure of the fluid contained within the pore space, induces expansion or compaction. Compression of the medium can also raise the pore pressure if the fluid does not have enough time to escape the pore network. These coupled mechanisms add a time-dependent character to the mechanical properties that can be a major concern in many applications, such as oil and gas exploration and recovery. This research is concentrated on determining the poroelastic parameters of fluid-saturated rock, and more specifically, directly measuring the so-called unjacketed pore modulus. Several indirect measurement of this parameter using relevant poroelastic constants have been performed, but limitations of this approach prevent a reliable estimation. Detailed poroelastic experiments, including hydrostatic compression and conventional triaxial compression under limiting conditions of drained, undrained, and unjacketed response are performed on two porous sandstones, Dunnville and Berea, as well as a synthetic silica specimen. The experimental data clearly show that for Dunnville sandstone and synthetic silica, both approximately representing an ideal porous material with a fully connected pore space, the unjacketed pore modulus is indeed equal to the unjacketed bulk modulus. The existence of non-homogeneities such as non-connected pores and compliant minerals in Berea sandstone cause a slight difference between these two moduli. Complete characterization of a transversely isotropic poroelastic behavior of Dunnville sandstone is also presented. The proposed experimental methods along with the results obtained from this research can be implemented for testing rock from the field. Furthermore, the developed techniques are applicable for the prediction of the mechanical response of fluid-filled carbon-capturing rock.