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Environmental Earth Sciences

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01-08-2017 | Original Article

Experimental study on coal pore structure deterioration under freeze–thaw cycles

Authors: Cheng Zhai, Shiliang Wu, Shimin Liu, Lei Qin, Jizhao Xu

Published in: Environmental Earth Sciences | Issue 15/2017

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Abstract

This study investigated the impact of consecutive freeze–thaw cycles on the coal pore structure deterioration. Eight coal samples (cores and thin sections) underwent different numbers of freeze–thaw cycles. The effect of freeze–thaw cycles on microscopic characteristics of the coal samples was evaluated by nuclear magnetic resonance and scanning electron microscope. The experimental results showed that the coal samples were significantly deteriorated by freeze–thaw cycles, inducing numerous cracks generated on the sample surfaces. The total porosity of coal continuously increased with consecutive freeze–thaw cycles. The number of pores in the coal samples increased under the effect of freeze–thaw stress. Moreover, the proportion of pores in the coal after freeze–thaw cycles altered. The proportion of micropores and mini-pores gradually decreased, while that of meso-pores and macro-pores (cracks) increased. Therefore, freeze–thaw stress was conducive to gas desorption, diffusion, and transportation, which ultimately improved the efficiency of coal bed methane extraction from coal seams.

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Title: Experimental study on coal pore structure deterioration under freeze–thaw cycles
Authors: Cheng Zhai
Shiliang Wu
Shimin Liu
Lei Qin
Jizhao Xu
Publication date: 01-08-2017
Publisher: Springer Berlin Heidelberg
Published in: Environmental Earth Sciences / Issue 15/2017
Print ISSN: 1866-6280
Electronic ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-017-6829-9

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