Research On Disaster-causing Characteristics Of Rock Burst Induced By Disturbance Loading And Its Integration Prevention Technology

Rock burst is divided into creeped deformation rock burst and disturbance loading rock burst according to stress time.Disturbance loading rock burst is alwasys dager due to the more serious shock occurred suddenly and hard to forecast.Besides,disturbance loading rock burst is more and more serious along with increasing of mining depth,mining intensity and disturbance intensity.Therefore,the paper was researched around the topic of "Research on disaster-causing characteristics of rock burst induced by disturbance loading and its integration prevention technology".And it was hoped to revealing the disturbance loading rock burst disaster-causing characteristics and providing prevention Countermeasures.Disturbence loading strain rate was definited firstly.The nature condictions of disturbance loading rock burst were analysised from the perspective of hard roof,fault,coal and rock burst potentialit and in-situ stress.Features of surrounding rock stress,deformation,deformation speed,deformation acceleration and failure were analysised by using numerical simulation.The destruction characteristics of coal triggered by disturbence loading was acomplished.The results showed that the strength,modulus,burst energy rate were partly decreased,ringing count,energy of acoustic emission(AE)and energy input rate changed with "growth slowly-growth quicklygrowth rapidly" along with dynamic stress strain rate increased.The dynamic failure mode changed with "shear failure-splitting failure-bursting failure".The relationship between dynamic loading strain rate and fractal dimension of fragment was quadratic.And the extremum strain rate was 2.8×10-3/s.The "disturbance-rockburst" system(D-R system)model was established.The energy function condiction of system burst is disturbance energy achieve 2 percent to 9 percent of static load energy.The occurrence feature of high energy microseismic events,time series feature,spatial evolution feature and its relationship to mining stress were analysised during mining.The mechanisms of fault activation,fault coal pillar and fault dislocation were theoretically researched.The relationship between support resistance,mining speed,mining footage and high energy bumps were analysised.The prediction criterion based on coal and rock's static structure and disturbance intensity of disturbance loading rock burst was established based on above research conclusions.And shock and burst weakening technology of disturbance loading rock burst was proposed.And the field application and effect verification was carried out.The integrated prevention technology based on disaster-causing characteristics of disturbance loading and rock burst has been formed.There are 87 figures,29 tables,and 182 references in this dissertation.