Quantitative identification of complexity of microscopic fracture structure of coal seam floor composite rock layer
Under mining conditions, the micro crack structure of the composite strata of the coal seam floor affects the uplift and seepage of the groundwater in the underlying high water pressure aquifer, and its complexity is of great significance for the prediction and early warning of the water disaster in...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
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Editorial Department of Coal Science and Technology
2023-07-01
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| Series: | Meitan kexue jishu |
| Subjects: | |
| Online Access: | http://www.mtkxjs.com.cn/article/doi/10.13199/j.cnki.cst.2023-0450 |
| _version_ | 1797448786130239488 |
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| author | Xinyi WANG Bo CHEN Shiyuan TIAN Yu ZOU Bo ZHANG |
| author_facet | Xinyi WANG Bo CHEN Shiyuan TIAN Yu ZOU Bo ZHANG |
| author_sort | Xinyi WANG |
| collection | DOAJ |
| description | Under mining conditions, the micro crack structure of the composite strata of the coal seam floor affects the uplift and seepage of the groundwater in the underlying high water pressure aquifer, and its complexity is of great significance for the prediction and early warning of the water disaster in the coal seam floor. In this paper, a total of 57 groups of rock samples extracted from three adjacent mines in the east of Pingdingshan Coalfield are taken as the object. Based on the comprehensive information of SEM image acquisition and N2 adsorption test, the fissure ratio of rock stratum area, equivalent crack diameter of rock stratum, fractal dimension value of fissure area, specific surface area, crevice volume and its fractal dimension are the main controlling factors. Using entropy weighted TOPSIS mathematical model, the complexity of the micro fracture structure of the composite rock stratum between the Ji16-17 coal seam and the Cambrian limestone top interface is quantitatively evaluated. The results show that the micro crack structure of the composite strata in the floor of the Ji16-17 coal seam is very simple, simple, medium, complex and extremely complex, accounting for 25.00%, 21.43%, 39.29%, 7.14% and 7.14% respectively. The micro crack structure of the composite strata in the study section is relatively uncomplicated; Compared with the four rock sections, the order of the quantitative mean value of the complexity of the rock stratum micro fracture structure is: L1−L2 limestone section>L5−L7 limestone section>sandstone section>bauxite mudstone section. The complexity of the rock stratum micro fracture structure better reflects the development of the rock stratum fracture. The paper considers the coupling effect of multiple factors on the composite rock stratum, realizes the quantitative classification and zoning discrimination of the micro crack structure in the vertical section of the composite rock stratum, which is of great significance for accurately describing the aquifer performance of the composite rock stratum in the coal seam floor and scientifically guiding the prevention and control of the water hazard in the coal seam floor. |
| first_indexed | 2024-03-09T14:15:30Z |
| format | Article |
| id | doaj.art-2418dc88c3b8489aa4bf896f9aceb3a0 |
| institution | Directory Open Access Journal |
| issn | 0253-2336 |
| language | zho |
| last_indexed | 2024-03-09T14:15:30Z |
| publishDate | 2023-07-01 |
| publisher | Editorial Department of Coal Science and Technology |
| record_format | Article |
| series | Meitan kexue jishu |
| spelling | doaj.art-2418dc88c3b8489aa4bf896f9aceb3a02023-11-29T01:40:43ZzhoEditorial Department of Coal Science and TechnologyMeitan kexue jishu0253-23362023-07-01517536310.13199/j.cnki.cst.2023-04502023-0450Quantitative identification of complexity of microscopic fracture structure of coal seam floor composite rock layerXinyi WANG0Bo CHEN1Shiyuan TIAN2Yu ZOU3Bo ZHANG4Institute of Resources & Environment, Polytechnic University, Jiaozuo 454000, ChinaInstitute of Resources & Environment, Polytechnic University, Jiaozuo 454000, ChinaInstitute of Resources & Environment, Polytechnic University, Jiaozuo 454000, ChinaJiangmen Branch Bureau of Hydrology, Guangdong Provincial Bureau of Hydrology, Jiangmen 529000, ChinaInstitute of Energy and Chemical Industry, China Pingmei Shenma Group, Pingdingshan 467000, ChinaUnder mining conditions, the micro crack structure of the composite strata of the coal seam floor affects the uplift and seepage of the groundwater in the underlying high water pressure aquifer, and its complexity is of great significance for the prediction and early warning of the water disaster in the coal seam floor. In this paper, a total of 57 groups of rock samples extracted from three adjacent mines in the east of Pingdingshan Coalfield are taken as the object. Based on the comprehensive information of SEM image acquisition and N2 adsorption test, the fissure ratio of rock stratum area, equivalent crack diameter of rock stratum, fractal dimension value of fissure area, specific surface area, crevice volume and its fractal dimension are the main controlling factors. Using entropy weighted TOPSIS mathematical model, the complexity of the micro fracture structure of the composite rock stratum between the Ji16-17 coal seam and the Cambrian limestone top interface is quantitatively evaluated. The results show that the micro crack structure of the composite strata in the floor of the Ji16-17 coal seam is very simple, simple, medium, complex and extremely complex, accounting for 25.00%, 21.43%, 39.29%, 7.14% and 7.14% respectively. The micro crack structure of the composite strata in the study section is relatively uncomplicated; Compared with the four rock sections, the order of the quantitative mean value of the complexity of the rock stratum micro fracture structure is: L1−L2 limestone section>L5−L7 limestone section>sandstone section>bauxite mudstone section. The complexity of the rock stratum micro fracture structure better reflects the development of the rock stratum fracture. The paper considers the coupling effect of multiple factors on the composite rock stratum, realizes the quantitative classification and zoning discrimination of the micro crack structure in the vertical section of the composite rock stratum, which is of great significance for accurately describing the aquifer performance of the composite rock stratum in the coal seam floor and scientifically guiding the prevention and control of the water hazard in the coal seam floor.http://www.mtkxjs.com.cn/article/doi/10.13199/j.cnki.cst.2023-0450composite stratamicrostructurecomplexityentropy weight-topsis modelduantitative identification |
| spellingShingle | Xinyi WANG Bo CHEN Shiyuan TIAN Yu ZOU Bo ZHANG Quantitative identification of complexity of microscopic fracture structure of coal seam floor composite rock layer Meitan kexue jishu composite strata microstructure complexity entropy weight-topsis model duantitative identification |
| title | Quantitative identification of complexity of microscopic fracture structure of coal seam floor composite rock layer |
| title_full | Quantitative identification of complexity of microscopic fracture structure of coal seam floor composite rock layer |
| title_fullStr | Quantitative identification of complexity of microscopic fracture structure of coal seam floor composite rock layer |
| title_full_unstemmed | Quantitative identification of complexity of microscopic fracture structure of coal seam floor composite rock layer |
| title_short | Quantitative identification of complexity of microscopic fracture structure of coal seam floor composite rock layer |
| title_sort | quantitative identification of complexity of microscopic fracture structure of coal seam floor composite rock layer |
| topic | composite strata microstructure complexity entropy weight-topsis model duantitative identification |
| url | http://www.mtkxjs.com.cn/article/doi/10.13199/j.cnki.cst.2023-0450 |
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