Cross sections for the Skkhalta to Didachara transfer tunnel project. Covers support classes I through IV with specific excavation areas, ranging from 23.68m² for Class I. I’ve included standard details for rock bolts, weepholes, and weldmesh too. Notes call for shotcrete strength class C30/37 and mentions Lugeon tests for water pressure. Shows the minimum excavation line, average overbreak, and pay lines. Overall a solid set for heavy civil or hydro tunnel projects needing support specs.
Tunnel Excavation Support Classes and Rock Bolt Detail Sections
