IS 2131 : 2025 Standard Penetration Test of Soil - Method of Test
1 SCOPE
1.1 This standard specifies a standard procedure for execution and reporting of the standard penetration test of soil.
1.1.1 The standard penetration test (SPT) aims to determine the resistance of soils at any depth in a borehole/trial pit to the penetration of a standard split spoon sampler and to recover disturbed samples for identification purposes.
1.1.2 The basis of the test consists of driving a split spoon sampler by dropping a hammer of 63.5 kg ± 0.5 kg mass on to an anvil or drive head from a height of 750 mm ± 10 mm. The number of blows (N) necessary to achieve 300 mm penetration of the sampler (after a seating penetration of 150 mm including self-penetration under gravity) is the penetration resistance.
1.2 SPT is used mainly to assess the strength and deformation parameters of cohesionless soils, but some valuable data may also be obtained in other soil types.
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 editions indicated were valid. All standards are subjected to revision and the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of these standards:
| IS No. | Title |
| IS 1892 : 2021 | Subsurface investigation for foundations - Code of practice (second revision) |
| IS 1893 (Part 1) : 2016 | Criteria for Earthquake Resistant Design of Structures Part 1 : General Provisions and Buildings (sixth revision) |
| IS 9640 : 2025 | Split spoon sampler for standard penetration test of soil - Specification (first revision) |
| IS 10208 : 1982 | Specification for diamond core drilling equipment |