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Minerals 2017, 7(2), 26;

Strength Reduction of Coal Pillar after CO2 Sequestration in Abandoned Coal Mines

State Key Laboratory of Hydro-Science and Engineering, Tsinghua University, Beijing 100084, China
Sanjiangyuan Collaborative Innovation Center, Tsinghua University, Beijing 100084, China
Institute of Geology and Geophysics of the Chinese Academy of Sciences, Beijing 100029, China
Author to whom correspondence should be addressed.
Academic Editors: Annalisa Martucci and Giuseppe Cruciani
Received: 3 November 2016 / Revised: 21 January 2017 / Accepted: 4 February 2017 / Published: 17 February 2017
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CO2 geosequestration is currently considered to be the most effective and economical method to dispose of artificial greenhouse gases. There are a large number of coal mines that will be scrapped, and some of them are located in deep formations in China. CO2 storage in abandoned coal mines will be a potential option for greenhouse gas disposal. However, CO2 trapping in deep coal pillars would induce swelling effects of coal matrix. Adsorption-induced swelling not only modifies the volume and permeability of coal mass, but also causes the basic physical and mechanical properties changing, such as elastic modulus and Poisson ratio. It eventually results in some reduction in pillar strength. Based on the fractional swelling as a function of time and different loading pressure steps, the relationship between volumetric stress and adsorption pressure increment is acquired. Eventually, this paper presents a theory model to analyze the pillar strength reduction after CO2 adsorption. The model provides a method to quantitatively describe the interrelation of volumetric strain, swelling stress, and mechanical strength reduction after gas adsorption under the condition of step-by-step pressure loading and the non-Langmuir isothermal model. The model might have a significantly important implication for predicting the swelling stress and mechanical behaviors of coal pillars during CO2 sequestration in abandoned coal mines. View Full-Text
Keywords: CO2 sequestration; abandoned coal mine; adsorption; swelling effect; strength reduction CO2 sequestration; abandoned coal mine; adsorption; swelling effect; strength reduction

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Du, Q.; Liu, X.; Wang, E.; Wang, S. Strength Reduction of Coal Pillar after CO2 Sequestration in Abandoned Coal Mines. Minerals 2017, 7, 26.

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