IS 15026 : 2002 Tunnelling Methods in Rock Masses -- Guidelines

1 Scope

This standard provides guidelines for rock tunnelling inHimalayan and other geological regions in India. In view of thedifficulties in forecasting geological formations along deep andlong tunnels particularly in complex geological environment, thesuggested strategy of tunnelling is such that tunnelling could bedone smoothly in usually all ground conditions. This standardrecommends strongly adoption of the steel fibre reinforcedshotcrete to cope up with even squeezing ground conditions. The useof steel ribs should be restricted to highly squeezing or swellingrock conditions only.

2 References

IS 432 Mild steel and medium tensile steel bars andhard-drawn steel wire for concretereinforcement:

Part 1 : 1982 Mild steel and medium tensile steel bars

Part 2 : 1982 Hard-drawn steel wire

IS 456 : 2000 Code of practice for plain and reinforcedconcrete

IS 800 : 1984 Code of practice for general construction insteel

IS 4880 : Part 6 : 1971 Code of practice for design oftunnelsconveying water:Part 6 Tunnel support

IS 5878 Code of practice for construction of tunnelsconveying water:

Part 4 : 1971 Tunnel supports

Part 6 : 1975 Steel lining

IS 9012 : 1978 Recommended practice for shotcreting

IS 9179 : 1979 Method for the preparation of rock specimen forlaboratory testing

IS 13365 : Part 2 : 1992 Guidelines for the quantitativeclassificationsystems of rock mass:Part 2 Rock mass quality for prediction ofsupport pressure in underground openings