Study on the Fracturing Height of Overburden Strata of Coal Face Based on Microseismic Monitoring
Coal mining causes the failure of overburden strata and forms caving and water-conducting crack zones,meaning “two regions”.The reliability of the monitoring result of fracturing height of overburden strata is a key factor to define the upper bound of safely mining.Because of the strain energy released during the formation of two regions,the corresponding weak seismic wave is made at the same time. Through the microseismic monitoring analysis of the fracturing height of overburden strata in 3up 107 coal face of Luxi Coal Mine , the distances of the uppermost 10 percent microseismic events of the overburden strata are relatively large and the energy is relatively small, so it is difficult to form the effective cracks conducting water.According to that, the fracturing height of overburden strata is determined as 38 m which is better consistent with the 36.2m which is defined by the in-site measuring method.Microseismic monitoring technology is proved to be available in determining the fracturing height of overburden strata of coal face.
Dongye Sun, Wen-Pei Sung and Ran Chen
X. J. Guo et al., "Study on the Fracturing Height of Overburden Strata of Coal Face Based on Microseismic Monitoring", Applied Mechanics and Materials, Vols. 71-78, pp. 3702-3705, 2011