Analysis floor failure characteristics of 7122 working face in the Qinan coal mine based on the plasticity theory

摘要

In order to study the floor damage depth of 7122 working face in the Qinan Coal Mine, we used Key strata theory and elastic-plastic theory to analyze the activities mechanisms and characteristics of the surrounding rock. By theoretical calculation obtained floor strata failure depth 8.79 m of 7122 Face Mining; The horizontal distance of from the greatest floor damage depth to the coal wall is about 5.71 m; The goaf floor failure distance is about 25.44 m. Combined with the results of plasticity theory, we had drawn floor damage feature maps of 7122 working face in Qinan Coal Mine.