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Standard Test Method for Measuring Normalized Standard Penetration Test (SPT) Value, N
1.1 This test method provides a procedure to normalize the Standard Penetration Test (SPT) N-value obtained from Test Method D1586/D1586M to standard energy for estimating engineering properties of sands. To reduce the inherent variability of the SPT, this test method requires energy measurements and restricts hammer systems and drilling methods. Refer to Standard Test Method D1586/D1586M on Penetration Test (SPT) and Split-Barrel Sampling of Soils for detailed information cited throughout this standard. Standard Guide D6286/D6286M provides additional information on drilling methods.
1.2 This test method requires the use of automatic hammers and the determination of the energy transmission, EFV, using Test Method D4633 to correct the SPT N-value and normalize it to N60 at 60 percent ETR (see 3.3).
1.3 The previous version of this standard was developed specifically for liquefaction evaluation of sands to provide an SPT (N1)60 value normalized to overburden stress of one-atmosphere pressure. Evaluation of liquefaction resistance requires qualified professional judgment, and (N1)60 corrections are now given in Appendix X1. Cone Penetration Testing (Test Method D5778) is also used for liquefaction evaluations as it is economical and provides detailed stratigraphic data.
1.4 Units—The values stated in either inch-pound units or SI units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Reporting of test results in units other than inch-pound units shall not be regarded as nonconformance with this practice. SI equivalent units shown herein are in general conformance with existing international standards.
1.4.1 For overburden stress pressure correction calculations methods in Appendix X1, common units are ton/ft2, kg/cm2, atm, and bars. Since these units are approximately equal (within a factor of 1.1), many users prefer the use of these units in stress correction calculations. For those using kPa or kN/m2, 100 kPa is approximately equal to one ton/ft2. The stress exponent, n, is approximately equal for these units.
1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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