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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摘要研究煤体孔裂隙结构介尺度特征下的水相渗流特性对探究煤体孔裂隙结构的跨尺度渗流具有重要意义，为研究煤体孔隙、裂隙双重结构介尺度特征下的水相渗流规律，利用表征体单元的概念界定出水在煤体孔裂隙结构中渗流的介尺度下界，基于煤体孔隙结构和裂隙结构水相渗流模型引入裂隙和孔隙结构贡献率修正系数，构建煤体孔裂隙结构跨尺度的水相渗流模型，通过数值分析和注水实验对模型分析与验证并进一步确定模型的适用范围。研究结果表明，煤体的裂隙贡献率修正系数随着孔裂隙率的增加而增大，孔隙结构贡献率修正系数随着孔裂隙率的增加而减小，且二者均呈现出幂函数的变化规律；模型渗流速度与实验渗流速度均随着孔裂隙率的增加而增大，高孔裂隙率时模型计算结果与实验结果一致性较差，低孔裂隙率时模型的计算结果与实验结果一致性较高；实验过程中应力的施加对高孔裂隙率煤体中水的渗流产生较大的影响，低孔裂隙率煤体中水的渗流受应力影响不大；孔隙率小于3%时的数据变异系数均小于15%，平均变异系数为9.70%＜15%，表明模型的预测值与实际的实验数据能够很好地吻合，验证了模型的正确性，所建立的预测模型适用条件为介尺度和低孔裂隙率。

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	王刚1
	2
	3
	王世斌1
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	李怀兴2
	3
	秦相杰2
	3
	李胜鹏2
	3

关键词 ：土力学, 介尺度, 孔裂隙结构, 贡献率修正系数, 渗流模型

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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引用本文:

王刚1，2，3，王世斌1，2，李怀兴2，3，秦相杰2，3，李胜鹏2，3. 考虑煤体孔–裂隙介尺度特征的水相渗流演化模型研究[J]. 岩石力学与工程学报, 2021, 40(8): 1547-1558.
WANG Gang1，2，3，WANG Shibin1，2，LI Huaixing2，3，QIN Xiangjie2，3，LI Shengpeng2，3. Study on water phase seepage evolution model considering mesoscale characteristics of pore and fissure in coal. , 2021, 40(8): 1547-1558.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0050 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I8/1547

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