IS 4880 Pt.4-1971

标准号：IS 4880 Pt.4-1971
发布日期：1971/11/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：1.1 This standard (Part IV) covers criteria for structural design of plain and reinforced concrete lining for tunnels and circular shafts in rock mainly for river valley projects.Note — The provisions may, nevertheless, be used for design of anv other type of tunnel, like railway or roadway tunnel, provided that all the factors peculiar to such projects which may affect the design are taken into account.1.2 This standard, however, does not cover the design of steel and prestressed concrete linings, tunnels in swelling and/or squeezing type of rocks, soils or clays and cut and cover sections.