Analysis on energy accumulation and release of roof under influence of mining speed

In order to reveal the relation characteristics between the stoping speed and the roof deformation energy,this paper first studied the energy accumulation law of roof under the stoping speed effect by theoretical analysis and numerical simulation,and then analyzed the energy release characteristic of roof by field monitoring.At last,the energy accumulation and release mechanism of roof is discussed.Results show:when the loading rate increases,the tensile strength of roof beam increase linearly,and the accumulated energy of roof shows an exponential growth trend; the increase of released energy of roof shows an exponential trend as increasing the stoping speed; when the stoping speed is 5.0～6.0 m/d,the microseismic activity is high energy and low frequency,but when the stoping speed is about 4.0 m/d,it is low energy and high frequency; when the stoping speed increases,the essence of accumulated energy increase of roof is the increase of loading rate,and the essence of energy release is that the increased elastic energy destroys the unstable dynamic balance of coal-rock system,which might induce rock burst.