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- 저자 : 윤형구 (검색결과 282 건)
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윤형구,정순혁,김래현,이종섭 한국지반공학회 2010 한국지반공학회논문집 Vol.26 No.8
The thin-layered sand seam in clay affects the soil behavior. Although the standard cone penetrometer (A: 10 cm2) have been used to evaluate the thin-layered soil, the smaller diameter cone penetrometer have been commonly recommended because of the high resolution. The purpose of this study is the development and application of the Cone Resistivity Penetrometer (CRP), which detects qc, fs, and electrical resistivity at cone tip for the evaluation of thin layered soils. Two sizes of the CRP are developed for the laboratory and field test. The projected areas of CRP for the laboratory and field tests are 0.78 cm2 (d: 1.0 cm) and 1.76 cm2 (d: 1.5 cm), repectively. The length of friction sleeve is designed in consideration of ratio of the projected area to the friction sleeve area. The application tests are carried out by using the artificially prepared thin-layered soils in the laboratory. In addition, the field tests are conducted at the depth of 6 to 15 m in Kwangyang. In the laboratory test, the measured electrical resistivity and cone tip resistance detect the soil layers. Moreover, in the field test the CRP investigates the three thin-layered soils. This study suggests that the CRP may be a useful tool for detecting thin-layered in soft soils.
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윤형구,이창호,이종섭,김준한 한국지반공학회 2009 한국지반공학회논문집 Vol.25 No.5
Preconsolidation stress is one of the important design parameters in soft soils because the behavior of saturated soft soils changes dramatically at the preconsolidation stress. For the estimation of preconsolidation stress, the global vertical settlement without considering micro strain behavior has been considered. The purpose of this study is to propose and verify a new method called the “shear wave velocity method” for determination of the preconsolidation stress reflecting on particle behavior at the small-strain. In this study, the undisturbed soft soils obtained at Busan, Incheon and Gwangyang in Korea were used. The oedometer cell incoporated with the bender elements is used for the consolidation tests under the K0 condition. The preconsolidation stress determined by the proposed method is compared with that estimated by Casagrande (e-log p′), Sridharan (log (1+e)-log p′), and Onitsuka (ln(1+e)-log p′) methods. This study suggests that the shear wave velocity method may determine simply the preconsolidation stress with considering the small-strain behavior.
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