ASTM D4428/D4428M-14 PDF Download

The ASTM D4428/D4428M-14 standard provides procedures for determining the velocity of primary compression (P-wave) and secondary shear (S-wave) seismic waves in soil materials. The test methods assume that the analysis of the collected data is based on first arrival times or interval arrival times over a measured distance.

The standard outlines acceptable interpretation procedures and equipment, including seismic sources, receivers, and recording systems. It also addresses other aspects such as borehole spacing, drilling, casing, grouting, deviation surveys, and actual test procedures. The goal is to ensure uniform test results by specifying the test procedure, data interpretation, and equipment specifications.

The information obtained from crosshole seismic testing can be used in various applications. This includes providing seismic wave velocity data for input into static/dynamic analyses, computing shear modulus, Young's modulus, and Poisson's ratio, determining Seismic Site Class using the appropriate Building Code, and assessing liquefaction potential.

It is important to note that the reliability of the results produced by these test methods depends on the competence of the personnel performing the test and the suitability of the equipment and facilities used. Compliance with the ASTM D3740 standard for competent and objective testing is recommended, but it does not guarantee reliable results. The quality of the results depends on multiple factors, and Practice D3740 provides a means of evaluating some of those factors.