IS 4968 -1976 Code Book PDF free download
This Indian Standard ( Part I ) ( First Revision ) was adopted by the Indian Standards Institution on 22 December 1976, after the draft finalized by the Soil Engineering Sectional Committee had been approved by the Civil Engineering Division Council. The resistance Ned (see Note) to penetration of the cone in terms of number of blows per 300 mm of penetration may be correlated with the bearing capacity of cohesion less soils and also possibly with the load carrying capacity of piles. The correlations are qualitative rather than quantitative in nature and are influenced by the character of the soils, such as grain-size distribution, surcharge pressure, permeability, and degree of saturation. The extra work required to determine the penetration resistance is small compared to the value of the data obtained, but these data only provide a rough indication of the consistency or relative density of the soil. NATE – ‘l’he France to penetration in the standard penetration test ( IS : 2131- 19632 ) shall be designated as N. that to a 50 mm cone as Ned and that to a 62.5 mm cone using Benton slurry as &BR [ IS : 4968 ( Part II )-1976 t 1.. Correlation between cone penetration values ( Ned ) and penetration values obtained by other methods may be developed for a given site by conducting the latter tests adjacent ( about 3 to 5 m ) to the location of the cone test ( see Note ). NOTE – However for the 62.5 mm cone driven dry up to a depth of 9 m ( without Benton slurry ) [ see IS : 4968 ( Part II )-19’76 t 1, for medium to fine sands, the following relationships have been developed by the Central Building Research Institute, Doorkeeper. These relationships, when utilized, shall be used with caution. N&r- 1*5 Nuptial depth of 4 m Nebr – l-75 .V for depths of 4 to 9 m. *Method for standard penetration test for soils. Method for subsurface sodding for soils: Part II Benton slurry (Jr m&ion ). Dynamic method using cone and where Nebr – cone resistance obtained with a 62.5 mm cone driven dry ( number of blows for 300 mm -penetration ); and N – resistance to acne with f” penetration in the standard penetration test ( in accord penetration ) . S :2131-1963*), (number of blows for 360 mm This standard was first published in 1968. In this revision several changes have been mad-e taking into consideration the experience gained in conducting the test and in the manufacture of the equipment. The major changes made relate to the material of the cone and *the hammer criteria for stopping of driving of the cone and the limitations. Reference has also been made to the automatic arrangement for controlling the drop of the hammer. In the formulation of this standard due weight age has been given to international co-ordination among the standards and practices prevailing in different countries in addition to relating it to the practice in the field in this country. 9.5 In reporting the result of a test or analysis made in accordance with this standard, if the final value, observed or calculated, is to be rounded off, it shall be done in accordance with IS : 2-1960 t.
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