46th Annual Conference

Sessions Speakers Exhibitors Floor Plan Buzz

Tunneling in Thinly Foliated Rockmass Conditions (Room Capitol Ballroom 5-7; Fourth Floor)

27 Jan 20
3:00 PM - 3:30 PM

Tracks: Session 5 - Underground

Speaker(s): G.C. Naveen
Tail Race Tunnel for a 1020 MW hydroeletric project was successfully excavated in thinly foliated rockmass conditions by D&B method. Rock Class “Q” values were between III and IV. Blasting was by full face parallel hole. Handling the cavities and overbreak was time consuming and warranted additional supports.