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Environmental Earth Sciences

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01.03.2019 | Original Article

Evaluation of the effect of adsorbed gas and free gas on mechanical properties of coal

verfasst von: Shouqing Lu, Yongliang Zhang, Zhanyou Sa, Shufang Si

Erschienen in: Environmental Earth Sciences | Ausgabe 6/2019

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Abstract

The mechanical properties of coal are important parameters for coalbed methane (CBM) extraction and gas outburst control. However, the effect of adsorbed gas on strength cannot be evaluated quantitatively yet. To better understand the weakening mechanisms of free and adsorbed gas on the strength of coal, normal coal, and deformed coal are chosen to test their mechanical properties of CH₄-saturated and non-gas-saturated specimens under different conditions. Under the same effective stresses, the peaks of strength of CH₄-saturated specimens with high-pressure gas are lower than those with low-pressure gas, implying that the adsorbed gas can also weaken the peak strength of coal. Then, a new model for the weakening values of strength induced by free and adsorbed gas was developed, and the effects of free gas and adsorbed gas on the strength of coal were assessed by our model. The results show that the free gas and adsorbed gas can weaken the strength of coal for different weakening mechanisms. The ratio of weakening value of strength due to free gas to that of adsorbed gas of the normal coal is 1.3–3.4, and that of the deformed coal is 8.4–19.8. These results can help us to better understand why the weakening effect of adsorbed CH₄ in the laboratory is ignored in earlier studies.

Vorheriger Artikel Occurrence mechanism and prediction of rocky land degradation in karst mountainous basins with the aid of GIS technology, a study case in Houzhai River Basin in southwestern China

Nächster Artikel Influence of buoyancy forces on movement of liquid radioactive waste from deep injection disposal site in the Tomsk region, Russian Federation: analytical estimate and numerical modeling

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Titel: Evaluation of the effect of adsorbed gas and free gas on mechanical properties of coal
verfasst von: Shouqing Lu
Yongliang Zhang
Zhanyou Sa
Shufang Si
Publikationsdatum: 01.03.2019
Verlag: Springer Berlin Heidelberg
Erschienen in: Environmental Earth Sciences / Ausgabe 6/2019
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-019-8222-3

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