Abstract:
The Bi-Directional Static Load Test (BDSLT) is a test that determines the capacity of deep foundations when loaded under bi-directional static axial compression. In recent years the BDSLT has seen an increment in demand due to its safety, speed, economical, and environmentally-friendly merits. This innovative foundation testing method has been universally used over the last 50 years, however only recently have respective codes been published. Detailed test procedures and methodologies of the test are expatiated in the ASTM D8169, published in February 2018, and in the IRC 78 Amendment, published in March 2018. Similarly, countries like China, Japan and Great Britain have published codes in this regard. As we know it the American, Indian and Japanese codes are the codes customarily used in India. They provide the minimum requirements for the execution of the BDSLT.
In this paper we did a comparative study of these codes and envisaged to bring attention to the similarities and discrepancies found therein, with an aim to detect the impacts and challenges that differing codal provisions have on the conduct and performance of the BDSLT. Discrepancies found have been explained on the basis of geotechnical engineering theories and relevant field experience of superior engineers. Testing procedures, results obtained, testing methods for permanent (working) piles as well as for initial (test) piles, terminologies used and their significance, design considerations, are among the criteria that have been compared. Due to the novelty of both codes, literature on the BDSLT is limited. Our review purposes to underline the gains and shortcomings found, while highlighting the relevance and judgment of experienced engineers when utilizing the code.
Key words: deep foundation (piles), Bi-directional Static Axial Load Test (BDSLT), hydraulic jack, permanent pile (working pile), test (routine) pile, axial displacements, load cell
Abstract: Theme 3