Research on overlying strata structure and stress feature aroused by mountainous shallow-buried coal seam mining

摘要

Contraposing the phenomenon that strata behaviors were intense,and supports damaged or the tail beam and roof beam separated,it analyzed the overlying strata movement rule,structure feature and stress feature aroused by mountainous shallow-buried coal seam mining with distinct element software UDEC.When mountainous shallow-buried coal seam mined,the overlying strata up to the surface would collapse,fall,and the horizontal displacement along mountain slope was apparent.The overlying strata would form "two-zone"structure with transmitting horizontal stress relatively weak,the hinging relationship between the strata rocks or can not form hinging relationship,and can not form beating structure with necessary bearing capacity by itself.The stress concentration range ahead of the face was small,but with higher maximum stress concentration factor,the weight of overlying strata that passed to preacted zone and coal seam ahead of face through the bearing structure was smaller,so the load on supports increased greatly.