Earthquakes and Structures

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Numerical and experimental study on evaluating the depth of caisson foundation with Sonic Echo method

  • Tong, Jian-Hua (Faculty of Department of Computer Science & Information Engineering, Hungkuang University) ;
  • Liao, Shu-Tao (Faculty of Department of Civil Engineering, Chung Hua University) ;
  • Liu, Kang-You (Graduate Student of Department of Civil Engineering, Chung Hua University)
  • Received : 2011.12.08
  • Accepted : 2012.04.10
  • Published : 2012.06.25
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Abstract

Using nondestructive testing techniques to evaluate the length or depth of an existing foundation is an important issue with potential high application values. One of these is to evaluate whether the foundation is broken after severe earthquakes. In this aspect, academic research related to nondestructive evaluation for caisson foundations is rarely reported. The objective of this paper is to study the feasibility of using Sonic Echo method to evaluate the depth of caisson foundations. Two types of caissons, simple cylindrical caisson and compound caisson with chambers, were studied for their responses to the Sonic Echo tests. The study was carried out in numerical simulation with finite element method and experimental way with in-situ tests. A bridge system which spans over Sofong Brook in Taiwan was selected for the tests in situ. The bridge system is still under construction and therefore the effect of different construction stages on the testing results may be studied. In this paper, the parameters to be varied for the studies include the testing locations and the existence of chamber plates, the bottom plate and the top plate. Finally some preliminary conclusions can be reached for a successful test.

Keywords

Acknowledgement

Supported by : National Science Council of Taiwan

References

  1. ASTM Book of Standards (2004), D5882, Vol. 04.09.
  2. Baker, C.N. Jr., Drumright, E.E., Mensah, F.D., Parikh, G. and Ealy, C.D. (1991), "Use of nondestructive testing to evaluate defects in drilled shafts: Results of FHWA research", Transportation Res. Rec., 1331, 28-35.
  3. Chow, Y.K., Phoon, K.K., Chow, W.F. and Wong, K.Y. (2003), "Low strain integrity testing of piles: Threedimensional effects", J. Geotech. Geoenviron., 129(11), 1057-1062. https://doi.org/10.1061/(ASCE)1090-0241(2003)129:11(1057)
  4. Davis, A.G. (2003), "The nondestructive impulse response test in North America: 1985-2001", NDT&E Int., 36(4), 185-193. https://doi.org/10.1016/S0963-8695(02)00065-8
  5. Finno, R.J. and Gassman, S.L. (1998), "Impulse response evaluation of drilled shafts", J. Geotech. Environ., 124(10), 965-975. https://doi.org/10.1061/(ASCE)1090-0241(1998)124:10(965)
  6. Kim, D.S., Kim, H.W. and Kim, W.C. (2002), "Parametric study on the impact-echo method using mock-up shafts", NDT&E Int., 35(8), 595-608. https://doi.org/10.1016/S0963-8695(02)00046-4
  7. Liao, S.T. and Roesset, J.M. (1997), "Dynamic response of intact piles to impulse loads", Int. J. Numer. Anal. Met., 21(4), 255-275. https://doi.org/10.1002/(SICI)1096-9853(199704)21:4<255::AID-NAG869>3.0.CO;2-J
  8. Liao, S.T., Tong, J.H., Chen, C.H. and Wu, T.T. (2006), "Numerical simulation and experimental study of parallel seismic test for piles", Int. J. Solid. Struct., 43(7-8), 2279-2298. https://doi.org/10.1016/j.ijsolstr.2005.03.057
  9. Olson, L.D., Jalinoos, F. and Aouad, M.F. (1995), "Determination of unknown subsurface bridge foundations", Report submitted to NCHRP, Transportation Res. Board, National Research Council, 129-148.
  10. Rausche, F., Shen, R.K. and Likins, G.E., Jr. (1991), "Comparison of pulse echo and transient response pile integrity test methods", Integrity Testing of Foundations, Transportation Res. Rec., 1331, 21-27.