Field Verification of Small Loading Plate for Laboratory Cyclic Plate Loading Test

Jung, Hyuk Sang; Yoon, Hwan Hee; Kim, Jin Suck; Son, Min Ho

doi:10.7782/jksr.2018.21.6.578

Cited by 1 publication

(6 citation statements)

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“…In a previous study mentioned earlier, Jung et al [6] conducted a field test to verify the small loading plate with of 50 mm in diameter and compared the results with those of the 300-mm loading plate. In this section, the repetitive plate-loading tests of the 50-mm and 300-mm loading plates were numerically analyzed by modeling the embankment roadbed where the existing field test was conducted.…”

Section: Comparison With the Results Of The Existing Field-verificatimentioning

confidence: 99%

“…As for the result of the field test, Jung et al (2018) found that the 50-mm loading plate was more affected by solid materials with large particle sizes, which are often included in rough embankment roadbeds, than the 300-mm loading plate, and thus, the strain modulus was excessively measured. As the elasto-plastic model used in this numerical analysis assumed homogeneous areas and excluded the effect of roadbed materials with large particle sizes, the strain modulus for the 50 mm loading plate was not excessively measured and the values of E v2 /E v1 were constant.…”

Section: Comparison With the Results Of The Existing Field-verificatimentioning

confidence: 99%

“…However, because it is based on the elastic theory derived under the assumption of homogeneous subgrade, caution must be exercised when it is actually applied to the field subgrade in which sand and clay with various particle sizes are mixed. Examining the use of the scale effect in lieu of the radius of the loading plate is also necessary [6].…”

Section: Plate Loading and Repetitive Plate-loading Testsmentioning

confidence: 99%

“…Jung et al [6] suggested the need for a loading plate that is smaller than 300 mm for the laboratory repetitive plate-loading test. For this, they examined the previous study cases and compared the repetitive plate-loading test results of the 50-and 300-mm loading plates through a field test.…”

Section: Previous Study Cases On the Scale Effect Of The Loading Platementioning

confidence: 99%

“…Jung et al [6] mentioned the necessity for a loading plate with a diameter of less than 300 mm, smaller than those generally used in the laboratory repetitive plate-loading test. To verify the results of the use of a 50-mm-diameter loading plate, the results were compared with those of a 300-mm-diameter loading plate in a field test.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study on Scale Effect of Repetitive Plate-Loading Test

et al. 2019

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Repetitive plate-loading test is intended to identify the elastic modulus of a target structure subjected to dynamic loading; such tests are mainly applied to railway roadbeds. The repetitive plate-loading test uses the same equipment as the plate-loading test but different loading methods. The plate-loading test derives the subgrade reaction modulus (k30), while the repetitive plate-loading test derives the strain modulus (Ev2). The former considers the scale effect of the loading-plate size, whereas the latter does not, thereby reducing the reliability of the results. Therefore, numerical analysis was conducted to propose a scale effect that can applied to field tests. First, to verify the 50-mm loading plate, a previous study comparing the results of the 300-mm loading plate in a field test was simulated by a numerical analysis, and the results were compared and analyzed. Next, the strain modulus was investigated according to the loading-plate size under subgrade conditions. An equation to estimate the scale effect applicable to loading plates with diameters of less than 762 mm was derived. The relationship between the calculated strain and elastic moduli was additionally analyzed.

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Section: Comparison With the Results Of The Existing Field-verificatimentioning

confidence: 99%

Section: Comparison With the Results Of The Existing Field-verificatimentioning

confidence: 99%

Section: Plate Loading and Repetitive Plate-loading Testsmentioning

confidence: 99%

Section: Previous Study Cases On the Scale Effect Of The Loading Platementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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