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However, this results in blow counts which are not easily converted to SPT N- values – many conversions have been proposed, some of which depend on the type of soil sampled, making reliance on blow counts with non-standard samplers problematic. Standard Penetration Test blow.
Designation: D − Standard Test Method for. Standard Penetration Test ( SPT) and Split-Barrel Sampling of Soils1. This standard is issued under the fixed designation D; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
Description:A variety of techniques have been proposed to compensate for the deficiencies of the standard penetration test, including the Cone penetration test , in-situ vane shear tests, and shear wave velocity measurements. The SPT values are presented either in the form of a table or in the form of bore log data. The tube has a drive shoe attached to its bottom and coupling head at top to accommodate the drill rod, used for testing. Problems with SPT[ edit ] The Standard Penetration Test recovers a highly disturbed sample, which is generally not suitable for tests which measure properties of the in-situ soil structure, such as density, strength, and consolidation characteristics. When the test is carried out in granular soils below groundwater level, the soil may become loosened. The test is repeated with advancement of bore hole till the required depth of exploration is reached or till a refusal condition is encountered. Purpose[ edit ] The main purpose of the test is to provide an indication of the relative density of granular deposits, such as sands and gravels from which it is virtually impossible to obtain undisturbed samples.