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Rod effects on transferred energy into SPT sampler using smart measurement system

Authors
Park, GeunwooKim, NamsunHong, Won-TaekLee, Jong-Sub
Issue Date
8월-2022
Publisher
TECHNO-PRESS
Keywords
dynamic resistance; energy correction; energy module; standard penetration test (SPT); transferred energy
Citation
SMART STRUCTURES AND SYSTEMS, v.30, no.2, pp.159 - 172
Indexed
SCIE
SCOPUS
Journal Title
SMART STRUCTURES AND SYSTEMS
Volume
30
Number
2
Start Page
159
End Page
172
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/143815
DOI
10.12989/sss.2022.30.2.159
ISSN
1738-1584
Abstract
To improve the accuracy of the standard penetration test (SPT) results, smart measurement system, which considers the energy transfer ratio into the sampler (ETRSampler), is required. The objective of this study is to evaluate the effects of joints and rod length on the transferred energy into the sampler. The energy transfer ratios into the rod head (ETRHead) and ETRSampler, and the energy ratio from the head to the sampler (ERHS) were obtained using energy modules, which were installed at the rod head and above the SPT sampler. Linear regression analyses are conducted to correlate the ERHS with the number of joints, rod length, and SPT N-values. In addition, the dynamic resistances are calculated using both transferred energies into the rod head and into the sampler, and are compared with the corrected cone tip resistance measured from the cone penetration test (CPT). While the ETRHead are generally constant, but the ETRSampler and ERHS gradually decrease along the depth or the number of joints, except at certain depths with high SPT N-values. Thus, the ERHS can be estimated using the number of joints, rod length, and SPT N-values. The dynamic resistance evaluated by E-Sampler produces a better correlation with the corrected cone tip resistance than that by E-Head. This study suggests that transferred energy into the SPT sampler may be effectively used for more accurate subsurface characterization.
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LEE, Jong Sub
공과대학 (건축사회환경공학부)
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