Research status and prospect on physical simulation test of coal and gas outburst
Coal and gas outburst is a common dynamic disaster in underground coal mining activities,which seriously threatens the safety and green production of coal mines.In view of the uncertainty,suddenness and danger of coal and gas outburst,physical simulation test has become effective means to study the mechanism of coal and gas outburst.By consulting a large number of literatures,it is found that:(1)the outburst simulation experimental device was iteratively upgraded from uniaxial to biaxial,pseudo-triaxial and true triaxial.The size of the specimen was upgraded from small to large,and the data acquisition was changed from single to diversified.The successful development of various large-scale multi-functional true triaxial visualization and modular test systems provides an effective platform for quantitative research on the mechanism of coal and gas outburst.(2)A large number of physical simulation experiments on coal and gas outburst around the"three elements"were carried out,and the influence of in-situ stress,gas pressure and physical and mechanical properties of coal on the outburst was explored.Through the evolution of coal seam temperature and two-phase flow impact,the outburst intensity was inverted,the initiation conditions and disaster mechanism of outburst were basically mastered,and the theoretical system of coal and gas outburst with Chinese characteristics was formed.However,with increasing the depth of coal mining in China,the mechanism of deep coal and gas outburst becomes more complex.In view of the shortcomings of coal and gas outburst research under the new situation,the future research direction is prospected,aiming at improving the mechanism system of coal and gas outburst,breaking through the research stage of qualitative hypothesis,exploring the quantitative conditions of disaster preparation,occurrence and development stage,and providing a reliable theoretical basis for the prediction and prevention of coal and gas outburst on site.
mining engineeringcoal and gas outburstexperiment devicephysical simulationresearch actuality
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