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Proceedings Paper

Experimental research on stress sensibility of permeability of coal samples based on scale effect
Author(s): Qingxin Qi; Yongwei Peng; Hongyan Li; Zhigang Deng
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Paper Abstract

The variation law of permeability of different scale coal samples (d=2.5 cm, d=3.8 cm, d=10 cm) under confining pressure load-on /load-off status is researched based on the experimental research. After nonlinear fitting to experimental results, the mathematic relationship between permeability and confining pressure is established. The scale effect of stress sensibility of permeability of coal samples to confining pressure status is found by the experiment. The change of permeability about smaller scale coal samples (d=2.5cm) is more sensitive than the larger one's (d=10 cm). The scale effect of stress sensibility of permeability of coal samples under confining pressure status has different features. At the initial stage of confining pressure load, scale effect is obvious. With the increase of confining pressure, scale effect turns weak. Scale effect of stress sensibility of permeability of coal samples under confining pressure unloading process is opposite to loading process. The formula of stress sensitivity of coal samples concerning scale effect and its application range are deduced. Parameter-Sensitivities Analysis of the formula is done in this paper.

Paper Details

Date Published: 25 August 2009
PDF: 8 pages
Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73756H (25 August 2009); doi: 10.1117/12.839380
Show Author Affiliations
Qingxin Qi, China Coal Research Institute, Tiandi Science & Technology Co., Ltd. (China)
Yongwei Peng, China Coal Research Institute, Tiandi Science & Technology Co., Ltd. (China)
Hongyan Li, China Coal Research Institute, Tiandi Science & Technology Co., Ltd. (China)
Zhigang Deng, China Coal Research Institute, Tiandi Science & Technology Co., Ltd. (China)


Published in SPIE Proceedings Vol. 7375:
ICEM 2008: International Conference on Experimental Mechanics 2008
Xiaoyuan He; Huimin Xie; YiLan Kang, Editor(s)

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