IS 4880 -1972 Code Book PDF free download

IS 4880 -1972 Code Book PDF free download

This Indian Standard ( Part V) was adopted by the Indian Standards Institution on 25 February 1972, after the draft finalized by the Water Conductor Systems Sectional Committee had been approved by the Civil Engineering Division Council. Water conductor system occasionally takes the form of tunnels through high ground or mountains, in rugged terrain where the cost of surface pipe line or canal is excessive and elsewhere as convenience and economy dictates. This standard, which is being published in parts, is intended to help the engineers in design of tunnels conveying water. This part lays down the criteria for structural design of concrete lining for tunnels in soft strata and soils, covering recommended methods of design. However, in view of the complex nature of the subject, it is not possible to cover each and every possible situation in the standard and many times a departure from the practice recommended in this standard may be necessary to meet the requirements of a project’ and/or site for which discretion of the designer would be required. Some such situations in which special investigations will be required are given below: a) Where swelling and squeezing types of rocks subject to internal tectonic stresses are met; b) Where high temperature carbonate formations are met, which may produce carbon dioxide; c) Where large variations in formation temperatures exist in different sections of a tunnel; and * d) Where anhydrous formations are met which may show expansion sometimes about 30 percent of their volume on becoming wet, Other parts of this standard are as follows: Part I General design, Part II Geometric design, Part III Hydraulic design, Part IV Structural design of concrete lining in rock, and Part VI Tunnel supports. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS : 2-1960*. The number of significant places retained in the rounded off values should be the same as that of the specified value in this standard.

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