LONGWALL MINING ROOF CONTROL SYSTEM

摘要

In a longwall mining operation, a panel to be extracted is formed in a seam of mine material by longitudinally extending headgate and tailgate entries with the panel beginning in a set up room and ending at a termination line in a recovery room. The recovery room is developed in two stages. In the first stage, the recovery room extends the transverse width of the panel and extends from the termination line a preselected distance to a first sidewall. A roof control system is installed to support the rock strata over the initial width of the recovery room. A primary support system includes mechanical roof bolt assemblies installed in accordance with a preselected bolt pattern. The roof bolt assemblies are supplemented by trusses extending in spaced parallel relation a preselected distance apart from the termination line to the first sidewall. Channel members are secured in end to end relation to the roof closely adjacent to and parallel to the first sidewall. Thereafter, the width of the recovery room is expanded to approximately twice the initial width. The roof above the expanded width of the recovery room is supported with a system complementary to the system initially installed including roof bolt assemblies, trusses and channel members. This system supports the roof of the recovery room to withstand the abutment pressures generated as the longwall shearers break through the termination line.