• Title/Summary/Keyword: radially inward drainage

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Constant Rate of Strain Consolidation Test for Radially inward drainage (일정변형률 압밀시험을 이용한 방사내측배수 압밀해석)

  • Yune, Chan-Young;Yang, Bong-Keun;Chung, Choong-Ki
    • Proceedings of the Korean Geotechical Society Conference
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    • 2004.03b
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    • pp.173-180
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    • 2004
  • In this study, a consolidometer for radially inward drainage under constant rate of strain (CRS) loading was developed. Theoretical solutions for determining the effective vertical stress and the coefficient of consolidation from the test result were also proposed. Reconstituted kaolinite samples which were consolidated up to 130 kPa were used to verify the developed consolidometer and the theory. Comparative experiments with CRS loading and incremental loading (IL) were carried out in radially in ward drainage as well as vertical and radially outward drainage. The results obtained from the developed CRS loading test agreed consistently with those of the conventional incremental loading test according to drainage directions. And the effect of drainage direction and drain diameter to consolidation characteristics was also evaluated. From the test results the applicability and the reliability of the suggested method were verified.

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Constant Rate of Strain Consolidation Test for Radially Inward Drainage (일정변형률 압밀시험을 이용한 방사 내측배수 압밀해석)

  • Yune, Chan-Young;Chung, Choong-Ki;Yang, Bong-Keun
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.26 no.5C
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    • pp.333-342
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    • 2006
  • In this study, a consolidometer for radially inward drainage under constant rate of strain (CRS) loading was developed. Their analytical solutions for evaluating consolidation characteristics of soils were also derived. With reconstituted kaolinite samples, comparative tests of the developed CRS loading consolidation in radially inward drainage together with incremental loading (IL) consolidation in radially inward, vertical and radially outward drainages and CRS loading consolidation in radially outward and vertical drainages were carried out. From the test results, It is confirmed that the results of the developed consolidometer were not only in good agreement with those of other consolidation tests but also they were more stable and reliable with less sample disturbance effect.

Numerical analysis of Consolidation Behavior under Various Drainage Conditions (배수조건에 따른 압밀 거동의 수치적 분석)

  • Oh, Sang-Ho;Cho, Wan-Jei;Yune, Chan-Young
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.03a
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    • pp.1194-1199
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    • 2010
  • Systematic finite element analyses on consolidation were performed with various drainage conditions. Numerical analyses were performed using SAGE CRISP2D, a commercial numerical analysis program for the conventional geotechnical engineering practice. For the input properties of the numerical analyses, incremental loading oedometer tests were performed on reconstituted kaolinite samples. Numerical analyses were performed with various drainage conditions such as vertical, radially inward and outward drainage conditions. For the case of radially inward drainage conditions, a series of numerical analyses were performed with varying the diameter of vertical drains. As a result, the lateral deformation and void ratio variation occurred during consolidation for the radially inward or outward drainage conditions. And the variations of the lateral deformation and void ratio did not fully disappear even after the completion of the consolidation and induced the spatial variations of the soil properties. Keywords : finite element analysis of consolidation, various drainage conditions, lateral deformation, spatial variation of soil properties.

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Anisotropy in Coefficient of Consolidation of Clay (점토의 압밀계수에 대한 이방성)

  • 강병희;이윤규;김경태
    • Journal of the Korean Geotechnical Society
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    • v.15 no.1
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    • pp.141-149
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    • 1999
  • In order to investigate the anisotropy in the coefficient of consolidation of the clay deposit, a series of consolidation tests were carried out on the artificially deposited clay sample by both Rowe-type and conventional consolidometers. The results of the tests showed that the coefficient of consolidation for radially inward drainage by Rowe-type consolidometer was about two times larger than that for vertical drainage by the conventional consolidometer. The smear effect caused by vertical sand drain installation was found to be significant, especially in the overconsolidated region, but smaller with the increase in consolidation pressure.

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Evaluation of Permeability and Related Soil Characteristics Based on Pore Pressure Measurement during Consolidation by Radial Drainage (방사배수 압밀 중 위치별 간극수압 측정을 통한 투수계수와 관련물성치의 결정방법)

  • Yune, Chan-Young;Chun, Sung-Ho;Chung, Choog-Ki;Lee, Won-Tekg
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.28 no.1C
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    • pp.9-17
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    • 2008
  • In this research, an analytical solution for the coefficient of permeability of soils during consolidation is suggested. The pore pressure and the flow rate measurements at different locations during consolidation are utilized. The void ratio and volume compressibility of soils under consolidation are also estimated. A large consolidation testing device, possible in both vertical and radial drainage is designed and manufactured. And consolidation test with kaolinite soils were performed under radially inward drainage direction. Pore pressures in varying radial distances and flow rate with time were measured as well as vertical deformations. From the test results, the changes of permeability, volume compressibility and void ratio under consolidation and their spatial variations are estimated. Thus the proposed solution is verified by comparing with the experimentally estimated test results. In addition, it is confirmed that permeability, void ratio and volume compressibility decrease as consolidation and loading steps progress. Also, these soil characteristics increase with radial distant from drainage boundary, where lowest values observed, and slightly decrease as approaching undrained boundary.