The ground forces generated by a properly installed and tensioned mine roof truss assembly can provide permanent mine roof support, even in severe ground conditions. This can be accomplished either by direct suspension of the rock loads within the potential failure zone above the mine opening or by indirect reinforcement of the natural rock arch that tends to form within the immediate mine roof. Notable advancements in mine roof truss support systems hardware and design technology have occurred since the introduction of the in situ mine roof truss concept for permanent mine roof support in 1966. The systematic installation of mine roof truss support systems has proven to be an effective method of mine roof control in room-and-pillar mines under a variety of ground conditions. This is true even in areas otherwise considered unminable because of severe roof-control problems. Properly designed mine roof truss systems have also been used for permanent support of mine slopes and haulage tunnels.
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