A new interpretation method of rapid pile load testing: verification through comparison with static load test

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Publication Title
A new interpretation method of rapid pile load testing: verification through comparison with static load test

Abstract
Hybridnamic Rapid Load Test (Hybridnamic RLT) and Static Load Test (SLT) were carried out on three identical open-ended steel pipe piles (SPPs), named Piles No. 2, No. 4 and No. 5, in the Jibanshikenjo test yard at Sashima, Ibaraki Prefecture, Japan. The test piles had an outer diameter of 318.5 mm, a wall thickness of 6.6 mm and an embedment length of 11.0 m. In the RLTs, the classic UnLoading Point Connection (ULPC) method and a new interpretation method: UnLoading Point Connection method invoking Case Method (ULPC_CM) proposed by the authors, were used to obtain “static” load-displacement curves. According to the Japanese RLT standards, the relative loading duration Tr = tL/(2L/c) (tL is loading duration, L is pile length, c is bar wave velocity in the pile) shall be greater than 5. In Pile No. 4, RLTs with Tr = 5 were caried out after SLT. In Pile No. 2, RLTs with Tr = 3 were carried out intentionally prior to SLT. In Pile No. 5, RLTs with Tr = 3 were caried out after SLT. In this paper, test conditions and test results are presented in detail. It will be shown that the static load-displacement curves from the ULPC method overestimate the SLT results, while the static load- displacement curves from the ULPC_CM method conform to the SLT results well even if Tr decreased to 3.
Authors
S. Lin; S. Kamei; I. Yamamoto; K. Watanabe; Tatsunori Matsumoto; N. Shkodrani

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

C - Risk analysis and safety evaluation

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