Tunnelling '79: Proceedings of the Second International Symposium, Organized by the Institution of Mining and Metallurgy, with the Cooperation of the British Tunnelling Society, the Institution of Mining Engineers and the Transport and Road Research Laboratory, Held in London from 12 to 16 March, 1979Michael John Jones |
Contents
Tunnel portals at Dinorwic North Wales | 3 |
design | 15 |
T Ellis T H Douglas and B G T Copeland | 30 |
Copyright | |
27 other sections not shown
Common terms and phrases
access tunnel adit advance anchors ANFO behaviour blasthole Bolmen bolts boreholes bunker chamber clay coal concrete lining construction contract Contractor conveyor cost cracks cross-section crown cut and cover cutter deformation delay depth diameter Dinorwic drainage drift drill and blast drivage drive Du Toitskloof effect engineering excavation extensometers fault fractured geological geotechnical groundwater grouting head holes horizontal hydraulic in-situ increase initial injection installed investigation joints kg/cm² Kielder kN/m² length limestone load located main tunnel maximum measurements mechanical method metre mining mudstone National Coal Board permeability Permian pilot tunnel portal precast prediction problems rock rockbolts roof sand sandstone Seelisberg tunnel segments settlement trough shaft shield shotcrete shown in Fig site investigation soil stability strata strength stress surface tests thickness tunnel boring tunnel boring machine tunnel face tunnel lining tunnelling machine underground values ventilation vertical zone