Not really my area, so I thought I'd ask the brains trust:
I have a tunnel section of 6m x 8m to be excavated in Granitic material which is likely to be fairly massive. Approx tunnel Length 15km with a mid point adit so each drive is 3-4km. Expectation is that the majority of the drive is Class I requiring minimum support.
My current finger in the air is 6 - 10m/day, but does anyone have any cycle times / excavation rates that I can compare against? There's nothing in the rates area of PP.
I understand some tunneling projects utilise an in-tunnel crusher and conveyors in an effort to boost production. Has anyone direct experience of this?
Much obliged,
G