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1 STS Sampling Procedures AMERICAN SOCIETY FOR TESTING AND MATERIALS Standard Method for PENETRATION TEST AND SPLIT - BARREL SAMPLING OF SOILS' This standard is issued under the fixed designation D 1886; the number immediately following the designation indicates the year of original adoption or in the case of revision, the year of the last revision. A number In parentheses indicates the year of last reapproval. A superscript epsilon (E)indicates an editorial change nine the last revision or reapproval. This method has been approved for use by agenoies of the •Department , of..Defense .and for,llating in the DOD Index of Specifications and Standards. - is _..11.00/14. 1.1 This method describes the proce- dure, generally known as the Standard Penetration Test (SPT), for driving a split- barrel sampler to obtain a repre- •sentative soil sample and a measure of the resistance of the soil to penetration of the sampler. 1.2 This standard may involve haz- ardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It iB the responsibility of whoever uses this Standard to consult and establish ap- propriate safety and health praotioes and determine the applicability of reg- ulatory limitations prior to use. For a specific precautionary statement, see 8.4.1. 1.3 The values stated in inoh -pound units are to be regarded as the stan- dard. R. Applicable Documents • 2.1 ASTM Standards: D2487 Test Method for Classification of Soils for Engineering Purposes2 D2488 Praotioe for Description and Identification of Boils (Visual - Manual Prooedure)2 D4220 Practice for Preserving and Transporting Soil Samples2 S. Descriptions of Terms Bnecifio to Ts Standard 3.1 anvil —that portion of the drive- rwa_1_4 wwww•••1.1.. «.1.aw1. 41.w l.w.. -... ..� strikes and through which the ham- mer energy passes into the drill rods. 3.2 cathead the rotating drum or windlass in the rope- cathead lift sys- tem around which the operator wraps a rope to lift and drop the hammer by successively tightening and loosening the rope turns around the drum. 3.3 drill rods —rods used to transmit downward force and torque to the drill bit while drilling a borehole. 3.4 drive- weight assembly --a device consisting of the hammer, hammer fall guide, the anvil, and any hammer drop system. 3.8 hammer —that portion of the drive - weight assembly consisting of the 140 t 2 lb (63.8 t 1 kg) impact weight whioh'.is . suocessively lifted and dropped to provide the energy that ac- complishes. the sampling and penetra- tion. 3 6 hammer drop system —that por- tion of the drive- weight assembly by whioh the operator accomplishes the lifting and dropping of the hammer to produoe the blow. 3 7 hammer fall guide —that part of the drive - weight assembly used to guide the fall of the hammer. 3.8 N -value —the blowoount repre- sentation of the penetration resistance of the soil. The N- value, reported in blows per foot, equals the sum of the number of blows required to drive the sampler over the depth interval of 6 to 18 in. (160 to 480 mm) (see 7.3). 3.9 AN —the number of blows ob- awa..wA t..w... en n1% n! Ch. a_4.. i1 an ......� intervals of sampler penetration (see 7.3). 3.10 number of rope turns —the total contact angle between the rope and the cathead at the beginning of the opera- tor's rope slackening to drop the ham- mer, divided by 360° (see Fig. 1). 3.11 sampling rods —rods that con- nect the drive - weight assembly to the sampler. Drill rods are often used for this purpose. 3.12 SPT— abbreviation for Standard Penetration Test, a term by which en- gineers commonly refer to this method. 4. significance and Use 4.1 This method provides a soil sam- ple for identification purposes and for laboratory tests appropriate for soil obtained from a sampler that may pro- duce large shear strain disturbance in the sample. 4.2 This method is used extensively in a great variety of geoteohnioal ex- ploration projects Many looal oorrela- tions and widely published correla- tions whioh relate SPT blowoount, or N- value, and the engineering behavior of earthworks and foundation are available. 'This method is under the iurlsdiotion of ABM Committee D-18 on Soil and Rook and is the direct responsibility of suboommittee D18.02 on Sampl- ing and Related Field Testing for Boil Inveetiga- tione. Ourrent edition approved Sept. 11, 1984. Published November 1084. originally published as D1686 -88T. Last previous edition D1686 -87 (1674). aaa.. a4...wewNa Vn1114.41A.