考虑煤体孔–裂隙介尺度特征的水相渗流演化模型研究

doi:10.13722/j.cnki.jrme.2021.0050

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Abstract Water phase percolation properties of coal with pore and fissure medium scale characteristics is of great significance for exploring cross-scale seepage of coal pore fissure structure. Using the concept of the representation unit to define the mesoscale lower bound of water seepage in coal pore fissure structure，and introducing the contribution rate correction coefficients of fissure and pore structures into the pore structure and fissure structure water seepage models，a cross-scale water seepage model of coal pore fissure structure was built. Through numerical analysis and water seepage experiment，the model was verified and its applicability was discussed. The results show that，with increasing the pore fissure rate，the correction coefficient of the contribution rate of the fissure structure increases while the correction coefficient of the contribution rate of the pore structure decreases，and that both show the rule of a power function. Both the model seepage velocity and the experimental seepage velocity increase with increasing the pore fracture rate. The consistency between the model calculation results and the experimental results is poor when the pore fissure rate is high while is high，when the pore fissure rate is low. The application of the stress in the experimental process has a great influence on the water seepage in the coal with a high pore fissure rate，while the influence for the coal with a low pore fissure rate is little. When the porosity is less than 3%，the variation coefficients of the data are all less than 15% with an average value of 9.70%，which indicates that the predicted values of the model are in good agreement with the actual experimental data and verifies the correctness of the model. The applicable conditions of the established prediction model are mesoscale and low pore fissure rate.

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	WANG Gang1
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	WANG Shibin1
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	LI Huaixing2
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	QIN Xiangjie2
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	LI Shengpeng2
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Cite this article:

WANG Gang1,2,3, et al. Study on water phase seepage evolution model considering mesoscale characteristics of pore and fissure in coal[J]. , 2021, 40(8): 1547-1558.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0050 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I8/1547

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