MINE HAUL ROAD APPLICATION: TE-BXC40 Composite Geogrid
This application involves the construction of a mine haul road built on compacted clay with blast rock/granite. These haul roads extend into a mine pit providing passage for rock dump trucks weighing several hundred tonnes. The compacted clay with blast rock/granite base course meant that the roads would be unreinforced at the interface of the sub-base and the subgrade, giving rise to lateral movement of particles. This would cause upward movement of the subgrade fines by pumping action resulting in sub-base failure. Repetitive heavy dump truck traffic also meant that heavy dynamic loads would be concentrated over the weak subgrade resulting in higher differential settlement.
Considering the characteristics of the subgrade soil in this scenario, both reinforcement and separation functions were important for optimal road performance. To ensure this, Titan proposed a solution which consisted of our TE-BXC40 composite geogrid installed at the bottom of the aggregate base layer. This solution provided our client with significant cost savings by allowing them to use far less aggregate base (0.7 mm thick vs. 1.0 mm) while helping to reduce impact on environment.