The Influence of Porosity on Tensile and Compressive Strength of Porous Chalks

Palchik, V.; Hatzor, Yossef H.

doi:10.1007/s00603-003-0020-1

Cited by 165 publications

(49 citation statements)

References 13 publications

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“…This agrees with the high porosity (e.g. Dunn et al 1973;Palchik 1999;Palchik and Hatzor 2004), as reported from the well logs, but not with the high quartz cementation reported from the drill cuttings. The other rock mechanical parameters cannot be compared since measurements of tensile and compressive strength are not feasible in the well.…”

Section: Rock Mechanical Propertiessupporting

confidence: 85%

Predictability of properties of a fractured geothermal reservoir: the opportunities and limitations of an outcrop analogue study

et al. 2017

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Section: Rock Mechanical Propertiessupporting

confidence: 85%

Predictability of properties of a fractured geothermal reservoir: the opportunities and limitations of an outcrop analogue study

et al. 2017

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“…The data of Papamichos et al [17] and Talesnick et al [22] for partially saturated chalks, and the data of Schroeder et al [18] and Risnes et al [26] for multiphase-saturated chalks are used in formulating the stress parameter. The stiffness and strength properties of chalk vary with porosity [12,58,59]; therefore, absolute strengths and stiffnesses for chalks with differing porosities cannot be compared directly. Relative values of strength and stiffness for different pore fluid compositions show trends when normalized with respect to porosity.…”

Section: Strength Trends and Parameter Values For Chalkmentioning

confidence: 99%

A model for pore‐fluid‐sensitive rock behavior using a weathering state parameter

Hickman

Gutierrez

Gennaro

et al. 2008

Num Anal Meth Geomechanics

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SUMMARYChalk and other porous rocks are known to behave differently when saturated with different pore fluids. The behavior of these rocks varies with different pore fluids and additional deformation occurs when the pore fluid composition changes. In this article, we review the evidence that behavior in porous rocks is pore-fluid-dependent, present a constitutive model for pore-fluid-dependent porous rocks, and present a compilation of previously published data to develop quantitative relationships between various pore fluids and mechanical behavior. The model proposed here is based on a state parameter approach for weathering and has similarities to models previously proposed for weathering-sensitive rocks in that the values for parameters that characterize material behavior vary as a function of weathering. Comparisons with published experimental data indicate that the model is capable of reproducing observed behavior of chalk under a variety of loading conditions and changes in pore fluid composition.

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“…The best relations between uniaxial compressive strength and elastic modulus with water content are found to be exponential functions 5,6,9,14 . The uniaxial compressive strength and elastic modulus also decrease with increasing porosity 4,[15][16][17] . A simplified model for crack damage stress (σ cd ) in terms of porosity, elastic modulus, and Poisson's ratio has been obtained 18 .…”

Section: Introductionmentioning

confidence: 96%

Pore pressure effects on strength and elasticity of ornamental stones

Khamrat¹,

Archeeploha²,

Fuenkajorn³

2016

ScienceAsia

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This experimental study determines the effects of pore pressure on the compressive strengths and elasticity of six ornamental stones. An approach to determine the pore pressure in low porosity rocks is presented. Rectangular rock specimens (50 × 50 × 100 mm 3 ) under dry and wet conditions were axially loaded under different rates from 0.001-10 MPa/s using a polyaxial load frame. The confining pressures ranged from 0 to 12 MPa. Wet granite, marl, marble, Phra Wihan sandstone, Phu Phan sandstone, and siltstone specimens have an average water content of 0.14%, 2.7%, 0.09%, 2.05%, 4.9%, and 1.5%, respectively. Compressive shear failure was observed in specimens under slow loading rate while extension failure was found in specimens under high loading rate. The strength values of the wet specimens were lower than those of the dry ones, particularly under the high confining pressure and loading rates.The strength values obtained from the dry testing were used to quantitatively calibrate the loading rate effect from the wet strengths, and hence the effect of pore pressure could be calculated. The pore pressures notably reduced the compressive strength and elastic modulus, and slightly increased Poisson's ratio of the rocks tested.

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The Influence of Porosity on Tensile and Compressive Strength of Porous Chalks

Cited by 165 publications

References 13 publications

Predictability of properties of a fractured geothermal reservoir: the opportunities and limitations of an outcrop analogue study

Predictability of properties of a fractured geothermal reservoir: the opportunities and limitations of an outcrop analogue study

A model for pore‐fluid‐sensitive rock behavior using a weathering state parameter

Pore pressure effects on strength and elasticity of ornamental stones

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