RLN
RLN Centerline Engineering Submerged Tunnel & Underground Decline Assessment · Geotechnical & Hydro-Mechanical Safety Tool
Basis:NSCP 2015ACI 318M-14ACI 506RAASHTO LRFD Road TunnelsFHWA-NHI-09-010Hoek–Brown 2002Terzaghi 1946DENR DAO 2000-98 / 2010-21
Assessment Parameters

Rock Units & Fault Zones (optional)

Rock units (one per line): name, chFrom, chTo, unit weight, GSI, mi, UCS — overrides the span values where a span's mid-point lies inside. Faults: name, chStart, width, GSI drop, UCS factor — any span touched by the zone is degraded (conservative). Chainage and strength in the selected unit system; lines starting with # are ignored.
1. Excavation Profile & Dimensions
2. Longitudinal Profile, Water Table & Support Status
3. Stress, Pore Pressure & Demand-Capacity (Span 1)

Configure inputs and press Assess Tunnel / Decline to generate engineering results.

Configure inputs and press Assess Tunnel / Decline to generate support recommendations.

Configure inputs and press Assess Tunnel / Decline to review full equation breakdowns and step-by-step calculations.