›› 2013, Vol. 34 ›› Issue (5): 1325-1330.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of impact of loading history on permeability characteristics of broken coal with different grain size gradations

WANG Lu-zhen1, 2, 3，CHEN Zhan-qing1, 3，KONG Hai-ling2，SHEN Hai-de3   

  1. 1. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China; 2. Department of Fundamental Sciences Teaching, Yancheng Institute of Technology, Yancheng, Jiangsu 224051; 3. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China
  • Received:2012-02-27 Online:2013-05-10 Published:2013-05-14

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Abstract: In order to confirm the impact of the loading history on the permeability characteristics of broken coal, the permeability characteristics of broken coal with different grain size gradations are tested under two experimental schemes by the CMT5305 electronic universal testing machine with a seepage circuit which is composed of gear pump, reversing valve, overflow valve, permeameter, etc. And the relations between the seepage velocity, permeability, the non-Darcy flow ? factor and the porosity are obtained under the two experimental schemes. The experimental results show: ①The power function fits the relationship between the seepage velocity, permeability and the porosity in the first experimental scheme; and exponential function fits the same relationship in the second scheme. ②When the porosity is large, the permeability and the non-Darcy flow? factor bear a relation to the loading history, while when the porosity is small, they tend to be stable and are independent of the loading history. ③With the decrease of the porosity, the non-Darcy flow ? factor changes from negative to positive in the first scheme; and the permeability characteristics of the broken coal with different grain size gradations are strengthened; but the non-Darcy flow ? factor is always negative in the second scheme and the permeability characteristics are weakened. ④Relation between the non-Darcy flow ? factor and the porosity can be fitted by the cubic polynomial, of which the coefficients have connections with the loading history.

Key words: loading history, broken coal with different grain size gradations, permeability characteristics, experiment

CLC Number: 

  • TD 315
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