Method for judging instability of coal body under wide-area strain rate

The invention provides a coal instability evaluation method under a wide-area strain rate. The method comprises the steps of collecting a coal sample, obtaining the uniaxial compressive strength and the impact tendency index of coal under the condition of a wide-area strain rate, collecting the uniaxial compressive strength, the impact tendency index and coal body instability critical load data and the like. The coal body instability monitoring method aiming at different conditions is provided on the premise that working face instability and coal pillar failure are avoided and the influence on an overlying strata stress field is reduced as far as possible aiming at working face coal body and coal pillar instability. And according to a coal body instability risk judgment result, a coal body instability grading prevention and control measure is provided. And a certain reference is provided for judging the instability of the coal seam and the coal pillar of the working face under different geological conditions.