Effect of PBD to improve soft marine sedimentary ground
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초록
The effect of plastic board drains (PBDs)on ground improvement was checked out considering three crucial factors: ground settlement, undrained shear strength, and residual water head. First, the settlement analysis including initial settlement induced by reclamation of sand mat was conducted by back calculation analysis with measured data. Its result showed that the PBDs used for this site worked well on improving soft ground. Secondly, the undrained shear strength was investigated by laboratory and in-situ tests including unconsolidated-undrained triaxial compression (UU) tests, unconfined compression tests, in-situ vane tests, and cone penetration tests. From the test results, they showed that the undrained shear strength of the improved ground by PBDs was significantly increased as well as the strength increasing ratio especially 10 ~ 15 m below the ground surface on site. Thirdly, the residual water head measurement from the in-situ dissipation test was found the same as the static water head, which indicated primary consolidation was completed and the effect of soil improvement with PBDs can be confirmed.
Abstract
The effect of plastic board drains (PBDs)on ground improvement was checked out considering three crucial factors: ground settlement, undrained shear strength, and residual water head. First, the settlement analysis including initial settlement induced by reclamation of sand mat was conducted by back calculation analysis with measured data. Its result showed that the PBDs used for this site worked well on improving soft ground. Secondly, the undrained shear strength was investigated by laboratory and in-situ tests including unconsolidated-undrained triaxial compression (UU) tests, unconfined compression tests, in-situ vane tests, and cone penetration tests. From the test results, they showed that the undrained shear strength of the improved ground by PBDs was significantly increased as well as the strength increasing ratio especially 10 ~ 15 m below the ground surface on site. Thirdly, the residual water head measurement from the in-situ dissipation test was found the same as the static water head, which indicated primary consolidation was completed and the effect of soil improvement with PBDs can be confirmed.
참고문헌 (18)
- Barron,R.A, "Consolidation of fine‐grained soils by drain wells", Trans. ASCE, 113, pp.718~748 (1948)
- Basu, D, "Effect of the smear and transition zones around prefabricated vertical drains installed in a triangular pattern on the rate of soil consolidation", Int. J. Geomech.,, 7(1), pp.34~43 (2007)
- Chai, J.C, "Investigation on some factors affecting vertical drain behavior", J. Geotech. Geoenviron. Eng., 125(3), pp.216~ (1999)
- Hansbo,S, "Consolidation of clay by bandshaped prefabricated drains", Ground Engineering, 12(5), pp.16~25 (1979)
- Hansbo,S, "Consolidation by vertical drains", Geotechnique, 31(5), pp.45~66 (1981)
- Holts, R.D, "Behavior of bent prefabricated vertical drains", Proceedings of the 12th ICSMFE, 13~ (1989)
- Kim, D.W, "Evaluation of discharge capacity of plastic board drain in simulated service situation", Polymer testing, 25(8), pp.986~993 (2006)
- Kiyama, M, "The new accelerated consolidation method combining the dewatering and plastic‐board‐drain by floating system (PDF) methods", pp.246~258 (2000), Noordwijkerhout, the Netherlands
- Korea Pusan New Port Company, "Report of soil investigation at Pusan New Port Area", ~ (1997)
- Korea Pusan New Port Company, "Design Manual of the Pusan New Port Project", Part II,pp, 1371~ (1999)
- Korean Geotechnical Society, "Report of the evaluation of PBD improvement at Pusan New Port Project", 99~105 (2004)
- Lee, H.J, "Improvement of plastic board drain method applied at the Pusan New Port Project site in Korea", The Proceedings of the 16th ISOPE conference, USA, pp.376~383 (2006)
- Miura, N, "Investigation on some factors affecting discharge capacity of prefabricated vertical grain", Sixth International Conference on Geosynthetics, pp.845~ (1998)
- Onoue,A, "Consolidation of multilayered anisotropic soils by vertical drains with well resistance", Soils and Foundations, 28(4), pp.75~90 (1988)
- Onoue,A, "Consolidation by vertical drains taking well resistance and smear into consideration", Soils and Foundations, 28(4), pp.165~174 (1988)
- Yoshikuni, H, "Consolidation of soils by vertical drain wells with finite permeability", Soils and Foundation, 14(2), pp.35~46 (1974)
- Yoshikuni, H, "Consolidation of fine‐grained soils by prefabricated drain", Proceedings of the 10th ICSMFE, Stockholm, 677~682 (1981)
- Zeng, G. X, "New development of the vertical drain theories", Proc. 12th International Conference on Soil Mechanics and Foundation Engineering Rio de Janeiro, Brazil, pp.1435~1438 (1989)