The rate dependence of dry, oil- or water-saturated high-porosity outcrop chalk is investigated based on whether the fluid effect could be excluded from a governing material parameter, the b-factor. The b-factor is used in geotechnical engineering to establish the difference in evolution of load between stress-strain curves when applying different loading rates. The material investigated is outcrop chalk from Stevns, Southern part of Denmark, with a porosity of 43 to 44% and subjected to varying loading rates. The Biot critical frequency is a function of the fluid properties viscosity and density, and the material properties porosity and permeability. The critical frequency is interpreted as a measure of the solid-fluid friction and hence relevant to use for subtracting the fluid effect to arrive at a pure material parameter. The results show a correlation between the b-factor and the Biot critical frequency.
|Number of pages||6|
|Publication status||Published - 2015|
|Event||49th US Rock Mechanics / Geomechanics Symposium - San Francisco, United States|
Duration: 28 Jun 2015 → 1 Jul 2015
Conference number: 49
|Conference||49th US Rock Mechanics / Geomechanics Symposium|
|Period||28/06/2015 → 01/07/2015|