Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Bedding Anisotropy and Effective Stress Law for the Permeability and Deformation of Clayey Sandstones
https://orcid.org/0000-0003-3311-5851
Abstract We performed a systematic investigation of the effective stress behaviors for permeability and deformation in relation to bedding anisotropy of two clayey sandstones. Permeability and deformation were measured in samples cored parallel and perpendicular to bedding over a broad range of hydrostatic pressures, covering ‘stage I’ for microcrack closure and ‘stage II’ for pore deformation. Our data show that bedding anisotropy has a significant influence on the effective stress coefficient for permeability, but little effect on the effective stress coefficient for pore volume change. The effective stress coefficient $${\kappa }^{\perp }$$ of permeability for flow perpendicular to bedding was consistently larger than the corresponding $${\kappa }^{||}$$ for parallel flow. The effective stress coefficient $${\beta }^{||}$$ for pore volume changes parallel to bedding and corresponding coefficient $${\beta }^{\perp }$$ values perpendicular to bedding coincided, because the scalar change of pore volume was not sensitive to the orientation of the samples. Furthermore, we confirmed that with the closure of preexisting microcracks, the effective stress coefficients for permeability in stages II were typically larger than the corresponding coefficients in stage I, and that the effective stress coefficients for axial strain and pore volume change decreased for samples both perpendicular and parallel to bedding. Our new results quantified the effect of bedding anisotropy and crack closure on the effective stress behavior of clayey sandstones.
Bedding Anisotropy and Effective Stress Law for the Permeability and Deformation of Clayey Sandstones
https://orcid.org/0000-0003-3311-5851
Abstract We performed a systematic investigation of the effective stress behaviors for permeability and deformation in relation to bedding anisotropy of two clayey sandstones. Permeability and deformation were measured in samples cored parallel and perpendicular to bedding over a broad range of hydrostatic pressures, covering ‘stage I’ for microcrack closure and ‘stage II’ for pore deformation. Our data show that bedding anisotropy has a significant influence on the effective stress coefficient for permeability, but little effect on the effective stress coefficient for pore volume change. The effective stress coefficient $${\kappa }^{\perp }$$ of permeability for flow perpendicular to bedding was consistently larger than the corresponding $${\kappa }^{||}$$ for parallel flow. The effective stress coefficient $${\beta }^{||}$$ for pore volume changes parallel to bedding and corresponding coefficient $${\beta }^{\perp }$$ values perpendicular to bedding coincided, because the scalar change of pore volume was not sensitive to the orientation of the samples. Furthermore, we confirmed that with the closure of preexisting microcracks, the effective stress coefficients for permeability in stages II were typically larger than the corresponding coefficients in stage I, and that the effective stress coefficients for axial strain and pore volume change decreased for samples both perpendicular and parallel to bedding. Our new results quantified the effect of bedding anisotropy and crack closure on the effective stress behavior of clayey sandstones.
Bedding Anisotropy and Effective Stress Law for the Permeability and Deformation of Clayey Sandstones
https://orcid.org/0000-0003-3311-5851
Abstract We performed a systematic investigation of the effective stress behaviors for permeability and deformation in relation to bedding anisotropy of two clayey sandstones. Permeability and deformation were measured in samples cored parallel and perpendicular to bedding over a broad range of hydrostatic pressures, covering ‘stage I’ for microcrack closure and ‘stage II’ for pore deformation. Our data show that bedding anisotropy has a significant influence on the effective stress coefficient for permeability, but little effect on the effective stress coefficient for pore volume change. The effective stress coefficient $${\kappa }^{\perp }$$ of permeability for flow perpendicular to bedding was consistently larger than the corresponding $${\kappa }^{||}$$ for parallel flow. The effective stress coefficient $${\beta }^{||}$$ for pore volume changes parallel to bedding and corresponding coefficient $${\beta }^{\perp }$$ values perpendicular to bedding coincided, because the scalar change of pore volume was not sensitive to the orientation of the samples. Furthermore, we confirmed that with the closure of preexisting microcracks, the effective stress coefficients for permeability in stages II were typically larger than the corresponding coefficients in stage I, and that the effective stress coefficients for axial strain and pore volume change decreased for samples both perpendicular and parallel to bedding. Our new results quantified the effect of bedding anisotropy and crack closure on the effective stress behavior of clayey sandstones.
Bedding Anisotropy and Effective Stress Law for the Permeability and Deformation of Clayey Sandstones
Meng, Fanbao (Autor:in) / Li, Xingfu (Autor:in) / Baud, Patrick (Autor:in) / Wong, Teng-Fong (Autor:in)
2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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