Abstract: Aiming at the complex problems of roadway support for the extremely soft and highly fractured comprehensively mechanized caving face encountered in the tunneling operation of the 14# coal seam in Shigang Mine of Shanxi Province, the support technology of “bottom and sidewall reduction, anchorage reinforcement, grouting reinforcement, and flat roof shed protection” is put forward through the analysis of the interaction mechanism between the support system and the surrounding rock.Based on the geological and structural conditions of the Shigang Mine, the support scheme for the extremely soft and highly fractured mechanized caving face roadway was designed, i.e.,“optimized reduction of the bottom and sidewalls, strong reinforcement of the anchoring system, comprehensive reinforcement of the grouting technology, and stabilized protection of the flat-topped steel shed”(referred to as “bottom side optimized anchor injection flat” support technology).The engineering verification results show that from the start of 15204 tunnel excavation until the tunnel structure stabilizes, the maximum relative deformation between the roof and floor is limited to 117 mm, while the maximum relative deformation of the two sides of the coal wall is 66 mm.This research result not only verifies the effectiveness of the support technology in controlling the large deformation of the surrounding rock in the extremely soft and highly crushed roadway, but also accelerates the process of excavation and improves the overall construction efficiency.It also accelerates the process of tunneling operation and improves the overall construction efficiency.