Swelling pressure studies of shales

Huang, Scott L.; Aughenbaugh, N.B.; Rockaway, John D.

doi:10.1016/0148-9062(86)90005-7

Cited by 23 publications

(11 citation statements)

References 3 publications

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“…In the latter case, crack propagation is controlled by stress corrosion (Atkinson and Meredith 1987). For the relation to (Huang et al 1986), which is negative, that is, of the same sign as tensile stresses. These "negative" pressures are used in the same way as the pore pressure in a saturated rock to derive conventional effective stresses.…”

Section: Effective Stressmentioning

confidence: 97%

Stress Field of the Earth’s Crust

2010

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Section: Effective Stressmentioning

confidence: 97%

Stress Field of the Earth’s Crust

2010

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“…The disjoining pressure is thus a microscopic concept which must be analyzed at the pore scale. The macroscopic swelling pressure which can be measured in natural materials [see, e.g., Madsen and Vonmoos, 1985;Huang et al, 1986;Wong, 1998] is associated with the wellknown swelling properties of certain clays (e.g., smectite). This pressure is currently described as the external stress that has to be applied to a clay-rock sample in order to maintain its mechanical equilibrium (prevent swelling).…”

Section: Introductionmentioning

confidence: 99%

What is the significance of pore pressure in a saturated shale layer?

Gonçalvès

Rousseau-Gueutin

Marsily

et al. 2010

Water Resources Research

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International audienceElectrostatic interactions, associated with negatively charged surfaces of clay minerals, produce a so-called "disjoining pressure" when diffuse layers overlap, i.e., at low porosity. Disjoining pressure is the pressure difference between the water in the clay pore space and that in a bulk solution at the same depth. Another widely used concept in clay-rocks is the "swelling pressure." It corresponds in fact to the macroscopic average of the disjoining pressure. This study proposes to determine the value of the swelling pressure of a natural material by a simple volume-averaging approach of the disjoining pressure, calculated for each clay mineral present in the material. The swelling pressure, which is dependent on the salinity of the pore fluid, is introduced into a hydrochemomechanical coupling, yielding a more general pressure diffusion equation. The results are compared to swelling pressure measurements for natural shale samples. The implications of this swelling pressure for water pressure measurements in natural formations are also discussed

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“…These tension cracks produce an increased infiltration of moisture, leading to swelling. The swelling of the rock causes a downward pressure and can create more tensile fractures within the weakly bonded material (Huang et al 1986). This progressive deterioration is what causes the unraveling process between the roof bolts.…”

Section: Shale As a Moisture-sensitive Materialsmentioning

confidence: 99%

Shale Failure Mechanics and Intervention Measures in Underground Coal Mines: Results From 50 Years of Ground Control Safety Research

Murphy

2015

Rock Mech Rock Eng

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Ground control research in underground coal mines has been ongoing for over 50 years. One of the most problematic issues in underground coal mines is roof failures associated with weak shale. This paper will present a historical narrative on the research the National Institute for Occupational Safety and Health has conducted in relation to rock mechanics and shale. This paper begins by first discussing how shale is classified in relation to coal mining. Characterizing and planning for weak roof sequences is an important step in developing an engineering solution to prevent roof failures. Next, the failure mechanics associated with the weak characteristics of shale will be discussed. Understanding these failure mechanics also aids in applying the correct engineering solutions. The various solutions that have been implemented in the underground coal mining industry to control the different modes of failure will be summarized. Finally, a discussion on current and future research relating to rock mechanics and shale is presented. The overall goal of the paper is to share the collective ground control experience of controlling roof structures dominated by shale rock in underground coal mining.

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Swelling pressure studies of shales

Cited by 23 publications

References 3 publications

Stress Field of the Earth’s Crust

Stress Field of the Earth’s Crust

What is the significance of pore pressure in a saturated shale layer?

Shale Failure Mechanics and Intervention Measures in Underground Coal Mines: Results From 50 Years of Ground Control Safety Research

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