Soil and Foundation Engineering Sectional Committee, CED 43FOREWORDThis Indian Standard (Part 4) (Second Revision) was adopted by the Bureau of Indian Standards, after the draftfinalized by the Soil and Foundation Engineering Sectional Committee hadbeen approved by the Civil EngineeringDivision Council.Pile load test is the most direct method for determining the safe loads on piles including its structural capacitywith respect to soil/rock in which it is installed. It is considered more reliable on account of its being in-situ testthan the capacities computed by other methods, such as static formula, dynamic formulae and penetration testdata. There are widely varying practices followed for load tests on piles. Particularly, the difficulties regardingthe establishment of an acceptable criterion, for determining the ultimate and safe bearing capacity of piles, andpredicting the pile group behaviour from the test data obtained from individual load test on single piles cannot beunder estimated as the factors affecting are many. However, an attempt is made to bring out a unified approach tothe various aspects of load test on piles.This standard (Part 4) was first published in 1979 to cover load test on piles. The other parts of this standard areas follows:(Part 1)Concrete piles(Part 2)Timber piles(Part 3)Under-reamed pilesThe standard was first revised in 1985 to give more details in regard to the rate of loading and unloading and thedetails of the situations when the different types of tests are conducted. Later Amendment No. 1 to the standardwas issued in May 1989 modifying the test load for routine test of piles.It has now been felt that the provisions regarding the load test of piles should be further revised to take intoaccount the recent developments in this field. This revision has been brought out to incorporate these developments.In this revision following major modifications have been incorporated:a)Definitions of various terms have been modified as per the prevailing engineering practice;b)The frequency for initial test has been modified;c)The test load for initial test pile has been added; andd)In case of both vertical load test and pull-out test, separate criteria for determining safe load of pileshave been specified on the basis of diameter of piles.