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Effects of polymer support fluid on shaft resistance of offshore bored piles

  • Chungsik Yoo (School of Civil, Architectural Engineering and Landscape Architecture, Sungkyunkwan University) ;
  • Chun-Won Shin (School of Civil, Architectural Engineering and Landscape Architecture, Sungkyunkwan University)
  • 투고 : 2021.10.05
  • 심사 : 2023.05.03
  • 발행 : 2023.06.10

초록

In this paper, we present the results of an experimental study on the effect of polymer support fluid on shaft resistance of offshore bored piles. A series of pullout tests were performed on bored piles installed under various boundary conditions considering different types of grounds and support fluids, and a range of support fluid exposure times. Contrary to previous studies concerning onshore bored piles, a time dependent effect of polymer fluid on shaft resistance was observed in all ground types. The adverse effect of polymer support fluid on the shaft resistance, however, was considerably less than bentonite support fluid for a given exposure time. No significant reduction in shaft resistance was evident when limiting the exposure time of the polymer support fluid to the side wall of the borehole within 2-3 hours. The degree to which the polymer fluid affects shaft resistance seemed to vary with the ground type. A proper consideration should be given to the time dependent effect of polymer fluid on shaft resistance of bored piles installed in offshore construction environment to limit its adverse effect on the pile performance. The practical implications of the findings are discussed.

키워드

과제정보

This research was supported by the National Research Foundation of Korea (Project Number: NRF-2021R1A2C3011490) and Hyundai Heavy Industries Co., LTD. This financial support is gratefully acknowledged.

참고문헌

  1. American Petroleum institute. (2003), Recommended Practice for Field Testing Water-Based Drilling Fluids, API RP 13B-1/ISO 10414-1, 82. 3rd Ed., Washington, D.C: American Petroleum Institute.
  2. ASTM D2487-11 (2011), Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System); West Conshohocken, PA: ASTM International. https://doi.org/10.1520/D2487-17.
  3. ASTM D3689 / D3689M-07 (2013), Standard Test Methods for Deep Foundations Under Static Axial Tensile Load; West Conshohocken, PA: ASTM International. https://doi.org/10.1520/D3689_D3689M-07R13E01.
  4. Ata, A. and O'Neill, M.W. (1997), "Characterization of the effect of polybore TMP polymer on the construction and performance of drilled shaft foundations", Research Report; University of Houston, Houston, Texas, USA.
  5. Brown, D. (2002), "Effect of construction on axial capacity of drilled foundations in piedmont soils", J. Geotech. Geoenviron. Eng., 128(12), 967-973. https://doi.org/10.1061/(ASCE)1090-0241(2002)128:12(967).
  6. Brown, D.A., Turner, J.P. and Castelli, R.J. (2010), "Drilled shafts: Construction procedures and LRFD design methods", FHWA-NHI-10-016, Federal Highway Administration, Virginia, USA.
  7. Camp, W.A., Brown, D.A. and Mayne, P.W. (2002), "Construction methods effects on drilled shaft axial performance deep foundations", Geotechnical Special Publication No. 116, ASCE, GSP 116, 193-208. https://doi.org/10.1061/40601(256)14.
  8. Cernak, B. (1976), "The time effect of suspension on the behavior of piers", Proceedings of the 6th European Conference on Soil Mechanics and Foundation Engineering, Vienna, Austria, January.
  9. Cooke, R.W. (1979), "Load transfer from bored, cast-in-situ piles in London clay", Behavior of Deep Foundations, Philadelphia, USA, 250-263.
  10. Farmer, I.W. and Goldberger, M. (1969), "Effect of bentonite on the skin friction of bored piles", Internal Report, Cementation Research, Ltd.
  11. Fleming, W.K. and Sliwinski, Z.J. (1977), "The use and influence of bentonite in bored pile construction", Report No. PG3; Construction Industry Research and Industry Association, London, UK.
  12. Frizzi, R.P., Meyer, M.E. and Zhou, L. (2004), "Full scale field performance of drilled shafts constructed utilizing bentonite and polymer slurries", Geo-Support 2004, ASCE GSP 124, 573-586. https://doi.org/10.1061/40713(2004)39.
  13. Hsiao, C.C., Topacio, A.J. and Chen, Y.J. (2020), "Evaluation of side resistance for drilled shafts in rock sections", Geomech. Eng., 21(6), 503-511. http://dx.doi.org/10.12989/gae.2020.21.6.503.
  14. ICE (Institution of Civil Engineers) (2016), ICE Specification for Piling and Embedded Retaining Walls, 3rd ed. ICE, London.
  15. Iqbal, S., Jehan, B., Khan, F.A., Khan, H., Khan, S.A. (2019), "Assessment of roof waterproofing by pre-packaged polymer modified slurry (PPPMS) and bitumen", Adv. Environ. Res., 8(1), 71-84. https://doi.org/10.12989/aer.2019.8.1.071.
  16. Lam, C. and Jefferis, S.A. (2015), "Physical properties of polymer support fluids in use and their measurement techniques", Geotech. Test. J., 38(7), 490-500. https://doi.org/10.1520/GTJ20140032.
  17. Lam, C. and Jefferis, S.A. (2016), "Performance of bored piles constructed using polymer fluids: Lessons from European experience", J. Perform. Constr. Fac., 30(2). https://doi.org/10.1061/(ASCE)CF.1943-5509.0000756.
  18. Lam, C., Jefferis, S.A. and Martin, C.M. (2014), "Effects of polymer and bentonite support fluids on concrete-sand interface shear strength", Geotechnique, 64(1), 28-39. https://doi.org/10.1680/geot.13.P.012.
  19. Lam, C., Jefferis, S.A., Suckling, T.P. and Troughton, V.M. (2015), "Effect of polymer and bentonite support fluids on the performance of bored piles", Soils Found., 55(6), 1487-1500. https://doi.org/10.1016/j.sandf.2015.10.013.
  20. Majano, R.E. and O'Neill, M.W. (1993), "Effect of mineral and polymer slurries on perimeter load transfer in drilled shafts", Report UHCE 93-1; Dept. of Civil and Environmental Engineering, University of Houston, Houston, USA.
  21. Majano, R.E., O'Neill, M.W. and Hassan, K.M. (1994), "Perimeter load transfer in model drilled shafts formed under slurry", J. Geotech. Eng., 120(12), 2136-2154. https://doi.org/10.1061/(ASCE)0733-9410(1994)120:12(2136).
  22. Meyers, B. (1996), "A comparison of two shafts: Between polymer and bentonite slurry construction and between conventional and osterberg cell load testing", Proceedings of the Southwest Regional FHWA Geotechnical Conference, Little Rock, Arkansas.
  23. Nash, K.L. (1974), "Stability of trenches filled with fluids", J. Constr. Division, 100(4), 533-542. https://doi.org/10.1061/JCCEAZ.0000456.
  24. O'Neill, M.W. and Hassan, K.H. (1994), "Drilled shafts: Effects of construction on performance and design criteria", Proceedings of the International Conference on Design and Construction of Deep Foundations, FHWA, Washington, D.C.
  25. Wates, J.A. and Knight, K. (1975), "The effect of bentonite on the skin friction in case-in-place piles and diaphragm walls", Proceedings of the 6th Regional Conference for Africa on Soil Mechanics and Foundation Engineering, Durban, South Africa.
  26. Yoo, C. (2017), "Performance of drilling fluids and their effects on RCD pile skin friction", Report SKKU-Geotech 17-1; Dept. of Civil and Environmental Engineering, Sungkyunkwan University, Suwon, Korea.
  27. Yoo, C. and Han, Y.S. (2019), "Effect of drilling fluid on concrete-soil/rock interface shear strength in seawater drilling environment", Mar.Georesour. Geotec., 37(8), 936-944. https://doi.org/10.1080/1064119X.2018.1508259.