In site monitoring and early warning method for coal and rock combined dynamic disaster

The invention discloses an in site monitoring and early warning method for a coal and rock combined dynamic disaster. The method comprises the following steps: firstly, selecting a mining roadway with the coal and rock combined dynamic disaster (rock burst and coal and gas outburst) as a monitoring area; mounting a KJ21 coal and rock combined stress in site monitoring system in the mining roadway, performing real-time online monitoring on the gas pressure and coal stress at a same measured point, counting and recording the influence of the coal stress on the gas desorption index, thereby analyzing the coupling relationship of the two; arranging a plurality of monitoring points in a coal rock, monitoring and analyzing the relevance of the coal stress and the gas pressure between different monitoring points and summarizing the rule on the basis of certain monitoring; and adopting two stress dynamic characteristics of acceleration and abnormal coefficient for early warning the coal and rock combined dynamic disa