Abstract
In order to verify the influence of floor damage upon the depth of floor failure and on the basis of determining mining depth, coal seam dip, mining thickness, length of working face, floor damage variable, whether there are faults and crushed zones as main on the working face are identified as main factors, taking 51,302 working face of Liangzhuang coalfield as studying object and the classic “three-zone”, the “four-zone” theory based on the damage mechanics, formula of “Detailed Rules for Coal Mine Water Prevention and Control” and BP neural network are applied to predict the depth of floor failure. The results are 20.0 m, 37.1 m, 20.88 m, and 35.2 m respectively; RFPA are used to set up two situations—no floor damage and floor damage—to simulate the floor failure depth of 51,302 working face and the simulation results are 18.2 m and 33.8 m respectively; The depth of floor failure of the 51,302 working face was measured by the installation of double ends sealed water-loss monitor, and the result was 34.47 m. Compared the above results with the measured one, it can be found that the “four-zone” theory, the BP neural network and the RFPA simulation results of the floor damaged are relatively close to the reality. Therefore, floor damage is an important factor affecting the floor damage depth.
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Acknowledgements
This research was financially supported by the National Science Foundation (41572244); National Natural Science Foundation of China (NSFC) (51778351); the Ministry of Education Research Fund for the Doctoral Program (20133718110004); the Shandong Province Nature Science Fund (ZR2015DM013); Shandong Province key research and development plan of China (2016GGX102029); Taishan Scholars Construction Projects Funded by Special Funds (2016GX0038). SDUST Research Fund. The authors would like to thank workers of the Department of Geology in the Liangzhuang coal mine for their field test and data collection.
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Yu, X., Liu, Y. & Fan, H. Influence of coal seam floor damage on floor damage depth. Environ Earth Sci 81, 182 (2022). https://doi.org/10.1007/s12665-022-10315-x
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DOI: https://doi.org/10.1007/s12665-022-10315-x