Rock burst prevention mechanism and effect of roof blasting pre-splitting in fully mechanized mining roadway along gob

YAN Yaodong; CHEN Kun; ZHAO Sen; LYU Fei; HAO Dianwei; SHI Rui

doi:10.11799/ce202502013

Abstract：To further explore rock burst risk by roof blasting pre-splitting on roadways by gob during fully mechanized mining,taking the No.41109 working face of a mine in Shaanxi Province as the engineering background,the theoretical derivation and data analysis methods were used to study the anti-impact mechanism and pressure relief effect of roof blasting pre-splitting on reducing rock burst risk at fully mechanized mining face.We obtain conclusions that roof blasting pre-splitting in the gob-side entry is a good way to locally prevent and control rock burst.By means of this method,the lateral overburden in roadways by gob transferred the structure in"long arm F→long arm L→short arm L",which,to some extent,alleviates the energy release frequency and strength of the coal and rock mass near the relatively high risk mining face in roadways along gob,and avoids the superposition of high static load and strong dynamic load,thus reducing the impact risk in roadways by gob.During in-site practice,the energy of microseismic events decreased by 12.7%and the frequency of microseismic events decreased by 46.2%at No.41109 working face within the same mining distance before and after the blasting.In roof blasting pre-splitting area,the general wall rock of roadways by gob is inclined to present a slighter deform,and the influence range of the advance mining stress of the working face decreases.There is no obvious disastrous rock burst during mining,which not only verifies the reliability of roof blasting pre-splitting as a local anti-impact measure,but also provides a reference for the prevention and control of rock burst in similar roadways by gob.