Effect of strain rate on mechanical response and failure characteristics of horizontal bedded coal under quasi-static loading

Abstract Strain rock burst is one of the main types bursts. Studying mechanical response and acoustic emission characteristics coal under quasi-static loading significant to control prevent strain In this paper, coal’s strength, deformation, energy evolution, failure were analyzed with different rates loading. The strength show a rate effect certain extent elastic modulus decreases first then increases stain increasing. Moreover, samples always accounts for high proportion before presents combined mode tensile shear dominance failure. contribution correspondingly when increases. Under loading, There range where does not appear, named as invisible area. static stress, direct action should be avoided reduce risk burst, especially isolated pillars. research achievements deepen understanding provides critical support prevention induced by