IS 9120 : 2025 Planning, Layout and Design of Cavities in Underground Hydroelectric Power Stations - Guidelines

ICS 27.140; 93.160

WRD 15

Revised Standard from Last Update.

1 SCOPE

This standard covers the guidelines for planning, layout and design of cavities in underground hydroelectric power stations.

2 REFERENCES

The standards given below contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreement based on this standard are encouraged to investigate the possibility of applying the most recent edition of these standards:

IS No.	Title
IS 1893 : 1984	Criteria for earthquake resistant design of structures (fourth revision)
IS 13365 (Part 2) : 2019	Quantitative classification systems of rock mass - Guidelines: Part 2 Rock mass quality for prediction of support pressure, support system and engineering properties in underground openings (first revision)
IS 15026	Tunneling in rock masses - Guidelines:
(Part 1) : 2022	Conventional tunneling methods (first revision)
(Part 2) : 2023	Mechanized tunneling methods by tunnel boring machines