Quantitative Characterization of the Water Flowing Fractured Zone Height in Working Face with Large Mining Height Based on Correlation Analysis
In order to accurately obtain the development law and final height of the water-conducting fracture zone of the working face with large mining height,401101 working face in Hujiahe Mine was taken as an example.The fracture mechanics was used to analyze the generation mechanism of the water flowing fractured zone,and the influencing factors of the development height of the water flowing fractured zone of the working face with large mining height were obtained.The prediction formula of the working face with large mining height was obtained by the method of multiple linear regression.The prediction results of the regression equation were verified by numerical simulation research and borehole flushing fluid leakage observation method.The results show that the mining height,mining depth and inclined length of working face are the main influencing factors of the development height of water flowing fractured zone,while the coal seam dip angle and the proportion coefficient of roof lithology are the secondary influencing factors.According to the 3DEC numerical simulation software,when the inclined length of the working face is 150 m,175 m,200m and 225 m,the maximum height of the water flowing fractured zone is 212 m,228 m,233 m and 251 m respectively,all of which develop to the bottom of the overlying Luohe Formation aquifer on the working face.Combined with borehole peeping and borehole flushing fluid leakage observation method,the measured height of water flowing fractured zone in 401101 working face is 226 m,and the ratio of fracture height to mining thickness is 22.32.Through different methods,the development of water flowing fractured zone in 401101 working face of Hujiahe Mine has been analyzed and predicted,which has verified the rationality of the proposed prediction formula.
Water flowing fractured zone heightOverlying strata migrationRegression analysisLarge mining heightNumerical simulation
万方数据
维普
