Abstract
To study the mining-induced failure depth of floor rocks in a fully mechanized mining caving field affected by different coal seam pitches, mining face lengths, burial depths and aquifer water pressures, multifactor-coupled orthogonal numerical tests on the failure depth of floor rocks were conducted. The numerical results show that the failure depth of floor rocks increases with increasing mining face length, coal seam pitch and burial depth. According to the relationship between failure depth and these impact factors, a multifactor-coupled prediction model for the failure depth of floor rocks was established. In addition, the in situ measurement of the failure depth of floor rocks in the Yitang Coal Mine in Huoxi coal field in Shanxi Province, China, was performed, and the in situ failure depths of floor rocks in the 100 502 (80 m) and 100 502 (180 m) mining faces were approximately 12.50–14.65 m and 17.50–19.20 m, in good agreement with the results of the multifactor prediction model. Furthermore, the sensitivity of each impact factor in the prediction model of the floor failure depth was further analysed by F-test and range analysis, and the impact order of studied factors on the floor failure depth is coal seam pitch > mining face length > burial depth > aquifer water pressure.
Highlights
The Carboniferous–Permian coalfield in North China is one of the most productive coal fields in China, where mining has transferred royalsocietypublishing.org/journal/rsos R
The results provide important guidance for coal mining under water pressure and offer a key theoretical reference for the failure depth control of floor rocks under similar geophysical conditions
The F-value of equation (3.2) is 7.748152, and the significance of F is 0.003194, far smaller than 0.05, suggesting that there is a good regression relationship between the failure depth and the impact factors and that the newly established multifactor prediction model for the failure depth of floor rocks is of statistical significance
Summary
The Carboniferous–Permian coalfield in North China is one of the most productive coal fields in China, where mining has transferred royalsocietypublishing.org/journal/rsos R. The in situ measurement of the stress or strain of floor rocks under active mining is the most direct and effective method for determining the deformation and failure of floor rocks [18,19,20]. Multifactor-coupled orthogonal numerical tests on the failure depth of floor rocks were performed, the impact of these factors on the failure depth was analysed, and a mathematical multifactor prediction model for the failure depth of floor rocks was established This prediction model was validated by the in situ monitoring results of the floor rocks in the Yitang coal mine, a sensitivity analysis of each impact factor on the failure depth was performed, and the impact order of the factors on floor rocks failure depth was determined. The results provide important guidance for coal mining under water pressure and offer a key theoretical reference for the failure depth control of floor rocks under similar geophysical conditions
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