Investigation On Rock Burst Liability And It's Prevention Of Jiang He Coal Mine

In resent years, with the excavation depth of coal mining increasing in china, more and more coal mine appears rock burst. The rock burst is one of the complex dynamic phenomena in coal mining, it's violent and destructiveness brings the huge threat for the mine safety production. Because the cause lead to rock burst is complex, the influencing factor to be numerous, the mechanism, the forecast and the control technique about rock burst has become the key point and the difficult question which the mining worker needs to solve.In this thesis, the domestic and foreign research results about rock burst, such as mechanism, the forecast and the control technique, has been summed. The thorough analysis to the coal crag's under blast load function destruction process as well as the release of pressure demolition prevention rock burst's mechanism has made. The theoretical analysis and the laboratory test are used to research the bursting liability of Jiang He coal mime, according to the produce condition the key factor, such as geology condition and technology, that impact rock burst has been analyzed, method of aggregative index was used to evaluate the burst dangerousness and determined the rock burst special hazard region. The main results obtained are as follows:Firstly, both the nature of geological factors and mining technological conditions are the main factors that lead to rock burst, points out the physical and bursting liability of coal are internal factors lead to rock burst, they are not only in relation to the rock formation and development but also have a major impact to measurements getting rid of danger.Secondly, through the research to physical and bursting liability of coal in Jiang He coal mime get that the coal has high strength and hardness characteristics,it's easy to conduct the rock burst.Thirdly, the test results about elastic strain energy index, bursting energy index, elastic deformation energy index and duration of dynamic fracture show that the coal has a moderate dangerous to rock burst.Fourthly, Method of aggregative index was used to evaluate the burst dangerousness of work face and determined the rock burst special hazard region.Fifth, Based on laboratory results and site visits, it is recommended way of getting rid of danger by relieving shot, and points out the purpose main decide the blasting parameters such as bore depth, bore distance and charge weight, and we may combination of several methods to study the effects of relieving-shotFinally, point out that apart from natural geological factors and mining technological conditions, we must also combined management techniques to strengthen the rock burst control.