IS 13783:1993 Part 1 is the Indian Standard (BIS) for guidelines for design and construction of large diameter tunnels (part 1: conventional tunneling method). This standard (Part 1) provides guidelines for the design and construction of large diameter tunnels (>3m) using conventional methods like the New Austrian Tunnelling Method (NATM) or drill-and-blast. It covers aspects from geotechnical investigations and empirical design based on rock mass classification to support systems and construction sequences.
Provides guidelines for the design and construction of large diameter tunnels using conventional methods, including drilling and blasting.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Minimum air velocity in working areas | 0.3 m/s | 0.5 m/s in all accessible parts of the tunnel | BS 6164:2019 |
| Blasting vibration limit (PPV) for residential structures | Typically 5-10 mm/s (by reference to IS 6922) | Guide value of 15 mm/s (at 4 Hz) to 20 mm/s (at 15 Hz) (by reference to BS 7385-2) | BS 6164:2019 |
| Shotcrete strength for temporary support | Typically 20-25 MPa (final strength), specified by design based on rock class. | Focus on early strength (e.g., J2/J3 class) and final strength of C25/30 (30 MPa) or higher. | ITA-AITES Guidelines |
| Tunnel applicability scope | Large diameter tunnels, generally exceeding 3 meters. | Applies to all man-entry tunnels regardless of diameter. | BS 6164:2019 |
| Grouting pressure for rock bolts | Generally 0.2 to 0.3 N/mm² (2 to 3 bar). | Typically 2-5 bar, or sufficient to ensure full encapsulation without damaging the rock mass. | FHWA-NHI-10-034 |
| Maximum permissible concentration of CO | 50 ppm (0.005%) | 30 ppm (8-hour Time-Weighted Average) | BS 6164:2019 |