The application of pre-stress compound truss cable in set-up room with large cross section thick coal roof

For the support problem of set-up room to be 9.0m wide and 3.5m high with thick coal roof in Wujiagou mine,the compound truss cable support system is adopted to control the set-up room surrounding rock.Combined with the flied actual geological conditions,the main support parameters such us cable length,cable angle and distance between orifice and side are determined through engineering analogy and the final support scheme is formed.The numerical simulation analysis comparison is made between the designed scheme and the original one,the application of pre-stressed compound truss cable system used to control the surrounding rock of large cross section set-up room is reliable and safe.The support scheme is successfully tested at set-up room No.5203 in Wujiagou mine.The set-up room deformation is small,and this kind of support technology can be widely used in the similar set-up rooms.