Law of strata pressure behavior of surrounding rock in nearby goaf roadway for extra-thick coal seams of Datong mine area

The nearby goaf road in the extra-thick coal seam of Datong mining area exhibits intense strata pressure behavior, which affects working face mining. Herein, we study laws behavior this detail using various methods, including laboratory tests, theoretical analyses, numerical simulation, and field monitoring. Considering mine characteristics road, namely, roof cracking, two-side deformation, floor heaving, mechanical tests failure analyses surrounding rock mining-induced non-uniform stress were carried out. circular-oval-butterfly trend under influence was obtained. steady evolution lateral coefficient ( λ =0.5∼1.8) butterfly mutation <0.35 or >2.1) analyzed. We performed simulation to plastic zone shape-size during excavation (with without top extraction road), law obtained for Tong Xin mine. Finally, monitoring indicates that spatial differences, difference between stresses two sides roof, deep shallow rock. findings on have great practical significance targeted measures control stability.