Some geological and geotechnical factors affecting the performance of a roadheader in an inclined tunnel

Bilgin N., DINCER T., Copur H., ERDOGAN M.

TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY, vol.19, no.6, pp.629-636, 2004 (SCI-Expanded) identifier identifier


The factors affecting the performance of 90 kW-shielded roadheader is investigated in detail in a tunnel excavated for Nub Cement Factory. The first part of the tunnel is horizontal and the second part is inclined with 9degrees and excavated uphill. Tunnel passes through a formation of the Upper Cretaceous age with nodular marl, carbonated claystone, thin and thick laminated limestone. Water ingress changes from 0 to 11 l/min. In six different zones it is found that the rock compressive strength changed from 20 to 45 MPa, tensile strength from 1 to 4 MPa, specific energy from 11 to 16 MJ/m(3), plastic limit from 15% to 29%, liquid limit from 27% to 43% and water absorption from 4% to 18% in volume.