Analysis of Impact Tendency and Sensitivity of Fractured Rock with Different Crack Arrest Measures

Crack propagation leads to rock instability and failure, which seriously influence the safe efficient operation of coal mines. According characteristics fracture development expansion, this paper takes a fractured with different crack numbers as research background studies effects grouted arrest measure, anchored measure on mechanical properties, energy evolution, progressive rock. The sensitivity measures peak strength, elastic modulus, total number, impact tendency are analyzed based sensitive percentage. experimental results show that more cracks in rock, greater increase stress smaller With number specimens gradually decrease, rocks, increase. produces lower when it is destroyed. produce higher pre-peak single-fractured larger, grouting multi-fractured has strong tendency. an important parameter index; primary stress, number; modulus. provide some guidance selection parameters scheme design practical engineering.