Research On The Dynamic Mechanical Response Of Driving Affected Zone In Coal Roadway And Its Effect On Dynamic Disaster

This thesis adopts the thought of “hypothesis-proof-conclusion-recommendation” to analyzethe dynamic response of driving-induced stress and its effect on dynamic disaster in the drivingaffected zone of coal roadway through theoretical analysis and experimental study. The hypothesisof “dynamic stress response plays an important part in coal or rock dynamic disaster” waspresented. With using the theory of mechanics of elastic and plastic and underground pressuretheory, the micro unit of coal in the driving affected zone was analyzed mechanically, and anidealized model of dynamic stress response behavior was built up. Then the hypothesis above wastheoretically demonstrated. The three-dimensional simulation experiment system is developedfor future research, which can achieve dynamic tunneling and drivage speed is adjustable andcontrolled. Through several sets of experiments, the calculation results demonstrate that dynamiccharacteristics and tractility of driving-induced stress in the coal mining roadway, thecompressibility and diversity characteristics of driving-induced stress under the processing ofcontinuous driving, and the compressibility-stretch alteration characteristics of driving-inducedstress under the processing of intermittent driving are do exist. The mechanism of dynamic stressresponse on coal or rock dynamic disaster and the controlling measures were presented. The studyhas shown that different dynamic rules and dynamic response effects show up according to thedifferent driving speed. And the key factor gestating disaster is that the risen abutment stresscaused by stress dynamic response effect in driving presses shortened coal block.