Geomechanics and Engineering

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Evaluation of side resistance for drilled shafts in rock sections

  • Hsiao, Cheng-Chieh (Department of Civil Engineering, Chung Yuan Christian University) ;
  • Topacio, Anjerick J. (Department of Civil Engineering, Chung Yuan Christian University) ;
  • Chen, Yit-Jin (Department of Civil Engineering, Chung Yuan Christian University)
  • Received : 2019.11.26
  • Accepted : 2020.04.24
  • Published : 2020.06.25
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Abstract

This study evaluated the side resistance of drilled shafts socketed into rock sections. Commonly used analysis methods for side resistance of piles in rocks are examined by utilizing a large number of load test data. The analysis of the unit side resistance of pile foundations embedded into rock sections is based on an empirical coefficient (α) and the uniaxial compressive strength (qu) or its root (${\sqrt{q_u}}$). The Davisson criterion was used to interpret the resistance capacity from the load test results to acquire the computed relationships. The α-${\sqrt{q_u}}$ relationship is proven to be reliable in the prediction of friction resistance. This study further analyzed the relationship by including the effect of rock quality designation (RQD) on the results. Analysis results showed that the analysis model of α-${\sqrt{q_u}}$-RQD provided better prediction and reliability considering the RQD classification. Based on these analyses, the side resistance of drilled shafts socked into rocks is provided with statistical data to support the analysis.

Keywords

Acknowledgement

This study was supported by the Ministry of Science and Technology, Taiwan, under contract number: MOST 107-2221-E-033-014.

References

  1. American Association of State Highway and Transportation Official (1992), Standard Specifications for Highway Bridges, Washington, U.S.A.
  2. Asem, P. and Gardoni, P. (2019a), "A load transfer function for the side resistance of drilled shafts in soft rock", Soils Found., 59(5), 1241-1259. https://doi.org/10.1016/j.sandf.2019.04.006.
  3. Asem, P. and Gardoni, P. (2019b), "Evaluation of peak side resistance for rock socketed shafts in weak sedimentary rock from an extensive database of published field load tests: A limit state approach", Can. Geotech. J., 56(12), 1816-1831. https//doi.org/10.1139/cgj-2018-0590.
  4. Chen, X.Y., Zhang, M.Y. and Bai, X.Y. (2019), "Axial resistance of bored piles socketed into soft rock", KSCE J. Civ. Eng., 23(1), 46-55. https//doi.org/10.1007/s12205-018-0942-5.
  5. Chen, Y.J. and Fang, Y.C. (2009), "Critical evaluation of compression interpretation criteria for drilled shafts", J. Geotech. Geoenviron. Eng., 135(8), 1056-1069. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000027.
  6. Chen, Y.J. and Kulhawy, F.H. (1994), "Case history evaluation of drilled shafts behavior", Report TR-104601, Electric Power Research Institute, Palo Alto, U.S.A.
  7. Chen, Y.J. and Kulhawy, F.H. (2003), "Evaluation of undrained side and tip resistances for drilled shafts", Soil Rock Amer., 2, 1963-1968.
  8. Chen, Y.J., Liao, M.R., Lin, S.S., Huang, J.K. and Marcos, M.C. (2014), "Development of an integrated web-based system with a pile load test database and pre-analyzed data", Geomech. Eng., 7(1), 37-53. http://doi.org/10.12989/gae.2014.7.1.037.
  9. Chen, Y.J., Lin, S.S., Chang, H.W. and Marcos, M.C. (2011), "Evaluation of side resistance capacity for drilled shafts", J. Mar. Sci. Technol., 19(2), 210-221.
  10. Davisson, M.T. (1972), "High capacity piles", Proceedings of the Lecture Series on Innovation in Foundation Construction, Chicago, Illinois, U.S.A., January-May.
  11. Hooley, P. and Lefroy-Brooks, S.R. (1993), "The ultimate shaft frictional resistance mobilized by bored piles in over consolidated clays and socked into weak and weathered rock", Eng. Geol. Sp. Publ, (8), 447-455.
  12. Horvath, R.G., Kenney, T.C. and Kozicki, P. (1983), "Methods of improving the performance of drilled piers in weak rock", Can. Geotech. J., 20(4), 758-772. https://doi.org/10.1139/t83.
  13. Hsiao, C.C. (2018), "Evaluation of side resistance for drilled shafts socketed into rock", Master Thesis, Chung Yuan Christian University, Taoyuan, Taiwan.
  14. Kaderabek, T.J. and Reynolds, R.T. (1981), "Miami limestone foundation design and construction", J. Geotech. Eng. Div., 107(7), 859-872. https://doi.org/10.1016/0148-9062(81)90663-X.
  15. Ku, C.S., Weng, J.Y., Liu, X.Z. and Lin, X.H. (2004), "Study on side resistance of soft rock foundations", Proceedings of the Rock Engineering Symposium, Tamsui, Taiwan.
  16. Kulhawy, F.H. and Goodman R.E., (2005), Foundation in Rock, in Ground Engineers Reference Book, Butterworth and Co. Ltd.
  17. Marcos, M.C. and Chen, Y.J. (2019), "Evaluation of side resistance of driven precast concrete piles", Mater. Sci. Eng., 658(1), 012005. https://doi.org/10.1088/1757-899X/658/1/012005.
  18. Peck, R.B., Hanson, W.E. and Thornburn, T.H. (1974), Foundation Engineering, 2nd Ed., John Wiley and Sons, Inc., New York, U.S.A., 361-371.
  19. Qian, Z.Z., Lu, X. L., Yang, W.Z. and Cui, Q. (2016), "Comparative field tests on uplift behavior of straight-sided and belled shafts in loess under an arid environment", Geomech. Eng., 11(1), 141-160. https://doi.org/10.12989/gae.2016.11.1.141.
  20. Rodgers, M., McVay, M., Horhota, D., Sinnreich, J. and Hernando, J. (2018), "Assessment of shear strength from measuring while drilling shafts in Florida limestone", Can. Geotech. J., 55(8), 1154-1167. https://doi.org/10.1139/cgj-2017-0321.
  21. Rowe, R.K. and. Armitage, H.H. (1987), "A design method for drilled piers in soft rock", Can. Geotech. J., 24(1), 126-142. https://doi.org/10.1139/t87.
  22. Stas, C.V. and Kulhawy, F.H. (1984), "Some observations on undrained side resistance of drilled shafts", Proceedings of the 1989 Foundation Engineering Conference, Evanston, Illinois, U.S.A., June.
  23. Yang, Z.Y., Shiau, J.Q., Ching, J.Y., Lee, Y.S. and Chen, C.J., (2010), "Side resistance of pile socketed into rock in Taiwan area", Proceedings of the Rock Engineering Symposium, Kaohsiung, Taiwan.
  24. Zhang, B., Mei, C., Huang, B., Fu, X., Luo, G. and Lv, B. (2017), "Model tests on bearing capacity and accumulated settlement of a single pile in simulated soft rock under axial cyclic loading", Geomech. Eng., 12(4), 611-626. https://doi.org/10.12989/gae.2017.12.4.611.

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