Experimental research on stress sensibility of permeability of coal samples based on scale effect

Qingxin Qi; Yongwei Peng; Hongyan Li; Zhigang Deng

doi:10.1117/12.839380

25 August 2009 Experimental research on stress sensibility of permeability of coal samples based on scale effect

Qingxin Qi, Yongwei Peng, Hongyan Li, Zhigang Deng

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73756H (2009) https://doi.org/10.1117/12.839380
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

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.

Citation Download Citation

Qingxin Qi, Yongwei Peng, Hongyan Li, and Zhigang Deng "Experimental research on stress sensibility of permeability of coal samples based on scale effect", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73756H (25 August 2009); https://doi.org/10.1117/12.839380

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