ASTM D3966/D3966M-07 (R2013)e1 PDF Download

The ASTM D3966/D3966M-07 (R2013)e1 standard provides guidelines and procedures for conducting tests to measure the lateral deflection of vertical or inclined deep foundations when subjected to lateral loading. These test methods can be used for all types of deep foundations, such as driven piles or cast-in-place piles, and can be applied to single piles or pile groups.

The standard emphasizes the importance of field tests in providing reliable information on the relationship between the lateral load applied to a deep foundation and the resulting lateral movement. Test results can be used by foundation designers to assess the lateral resistance along the pile shaft, the long-term load-deflection behavior, and the ultimate lateral capacity and deflection at service load of the foundation. The results can also help evaluate the viability of different piling types and the variability of the test site.

The standard also highlights the analysis of lateral test results using proper instrumentation to characterize pile-soil interaction properties and estimate bending stresses and lateral deflections along the length of the pile. If feasible and within safe structural limits, the maximum load applied should reach a failure load to determine the ultimate lateral load capacity of the pile(s). Tests that achieve a failure load may also lead to more efficient foundation design by reducing the length, quantity, or size of the piles.

In cases where it is impractical to apply lateral test loads to an inclined pile, the standard allows the use of lateral test results from a nearby vertical pile to evaluate the inclined pile's lateral capacity. It is important to note that the quality and reliability of the test results depend on the competence of the personnel performing the test and the suitability of the equipment and facilities used.