Damage Characteristics Caused by Deep-Hole Blasting near Normal Fault and Its Effects on Coal and Gas Outbursts

To understand the stability of coal and rock in areas normal faults disturbed by dynamic loads blasting, damage characteristics within a fault are investigated using similarity simulation tests. The mechanism for gas outbursts is analyzed theoretically, results indicate that maximum tensile stress vertical direction blasting hole normal-fault model 1.17 times no-fault model. propagation cracks near produces crushing circles, more produced model, causing severe to seam floor adjacent upper wall fault. Meanwhile, on surface falls off. extend roof through footwall Cracks strata interpenetrate those around hole, which potentially dangerous area outbursts. cumulative caused vibrations increases extent scope rock, broken provide weak surfaces flow channels can lead disasters. research will theoretical basis disasters induced disturbance structures. Based cases Didaoshenghe Coal Mine Heilongjiang Province, China, an important reason such incidents considered be being air-powered drilling.