Effect of moisture content on mechanical properties of Nemo coal, Moberly, Missouri U.S.A.

White, Jon; Mazurkiewicz, Marian

doi:10.1016/s0167-9031(89)90272-7

Cited by 14 publications

(5 citation statements)

References 4 publications

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“…The graphs in Figure 5 show the minimum UCS and a modulus minimum occurs at around 85% carbon content, where porosity and cleat spacing are also minimum. Similar trends have been reported in other studies, for example (White and Mazurkiewicz 1989) have shown that an increase in moisture content (from 3.7% to 12%) causes a decrease in mean strength and elastic modulus by 12.5% and 35%, respectively for bituminous coals. As the strength data are generally obtained from small specimens it would be expected that the strength trend is unaffected by the cleat spacing.…”

Section: Mechanical Properties Of Coalsupporting

confidence: 91%

Mechanical and flow behaviours and their interactions in coalbed geosequestration of CO₂

Masoudian

Airey

El-Zein

2013

Geomechanics and Geoengineering

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Studying gas transport mechanisms in coal seams is crucial in determining the suitability of coal formations for geosequestration and/or CO 2-enhanced coal bed methane recovery (ECBM), estimating CO 2 storage capacity and recoverable volume of methane, and predicting the long-term integrity of CO 2 storage and possible leakages. Due to the dual porosity nature of coal, CO 2 transport is a combination of viscous flow and Fickian diffusion. Moreover, CO 2 is adsorbed by the coal which leads to coal swelling which can change the porous structure of coal and consequently affects the gas flow properties of coal, i.e. its permeability. In addition, during CO 2 permeation, the coal seam undergoes a change in effective stress due to the pore pressure alteration and this can also change the permeability of the coal seam. In addition, depending on the in situ conditions of the coal seam and the plan of the injection scheme, carbon dioxide can be in a supercritical condition which increases the complexity of the problem. We provide an overview of the recent studies on porous structure of coal, CO 2 adsorption onto coal, mechanisms of CO 2 transport in coalbeds and their measurement, and hydro-mechanical response of coal to CO 2 injection and identify opportunities for future research.

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Section: Mechanical Properties Of Coalsupporting

confidence: 91%

Mechanical and flow behaviours and their interactions in coalbed geosequestration of CO₂

Masoudian

Airey

El-Zein

2013

Geomechanics and Geoengineering

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“…White and Mazurkiewicz [76] observed in bituminous coal that the reduction in uniaxial compressive strength and modulus was higher when the bedding orientation was parallel to the loading direction as compared with the perpendicular orientation. A similar observation was reported by Zhang et al [79] when they studied the strength and deformational responses of schistose rocks in uniaxial compression and indirect [23].…”

Section: Influence Of Bedding/foliation and Water Contentmentioning

confidence: 99%

Water effects on rock strength and stiffness degradation

2015

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Reduction in strength and stiffness in rocks attributed to an increase in water content has been extensively researched on a large variety of rock types over the past decades. Due to the considerable variations of texture and lithology, the extent of water-weakening effect is highly varied among different rock types, spanning from nearly negligible in quartzite to 90 % of uniaxial compressive strength reduction in shale. Readers, however, often face difficulties in comparing the data published in different sources due to the discrepancy of experimental procedures of obtaining the water saturation state and how the raw laboratory data is interpreted. In view of this, the present paper first reviews the terminologies commonly used to quantify the amount of water stored in rocks. The second part of the paper reviews the water-weakening effects on rock strengths, particularly focusing on uniaxial compressive strength and modulus, as well as tensile strength, under quasi-static loading and dynamic loading. The correlation relationships established among various parameters, including porosity, density and fabric of rocks, and external factors such as strain rate, surface tension and dielectric constant of the saturating liquid, absorption percentage and suction pressure, are reviewed and presented toward the end of the paper.

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“…The regression results show good correlation (R 2 0.9) between (8) and the test data ( Table 5). The parameter α is then used to calculate the cohesion and friction angle by using (9) and (10). The c and φ values for each loading rate are summarized in Table 5 and are plotted as a function of loading rate in Fig.…”

Section: Calibrating Loading Rate Effectsmentioning

confidence: 99%

“…Water content can remarkably reduce the rock strength after only 1% water saturation 5,6 . The strength of a wet specimen is lower than that of a dry one 1,3,[7][8][9][10] and the tensile strength of rocks under saturated conditions is lower than that under dry conditions 11,12 . The influence of water on deformability of rocks is reflected as a reduction of Young's modulus and an increase of Poisson's ratio 3,7,13,14 .…”

Section: Introductionmentioning

confidence: 98%

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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Effect of moisture content on mechanical properties of Nemo coal, Moberly, Missouri U.S.A.

Cited by 14 publications

References 4 publications

Mechanical and flow behaviours and their interactions in coalbed geosequestration of CO₂

Mechanical and flow behaviours and their interactions in coalbed geosequestration of CO₂

Water effects on rock strength and stiffness degradation

Pore pressure effects on strength and elasticity of ornamental stones

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Effect of moisture content on mechanical properties of Nemo coal, Moberly, Missouri U.S.A.

Cited by 14 publications

References 4 publications

Mechanical and flow behaviours and their interactions in coalbed geosequestration of CO2

Mechanical and flow behaviours and their interactions in coalbed geosequestration of CO2

Water effects on rock strength and stiffness degradation

Pore pressure effects on strength and elasticity of ornamental stones

Contact Info

Product

Resources

About

Mechanical and flow behaviours and their interactions in coalbed geosequestration of CO₂

Mechanical and flow behaviours and their interactions in coalbed geosequestration of CO₂