Embedding Complementary Support Mechanism and Technology of Roof in Extremely Loose Coal Seam

According to the engineering problems of carriage surface in a coal mine roadway 7209 belt conveyor of Huaibei Mining Group, the damage causes and composite roof support difficulties of roadway surrounding rock in very loose coal seam are analyzed, a embedding complementary support way, namely "metal U steel scaffolding + anchor rod and high strength double V type plate bracket fill strong + anchor cable and the steel network spray", is proposed. The supporting mechanism among the supports is introduced and field tests are conducted with good results. The application of embedding complementary support way not only changes the conditions that roadway support is difficult with mining depth, but also improves the construction efficiency.