Similar articles

Abstract: The principle and process of parallel seismic (PS) testing for the integrity testing of cemented soil columns are introduced in this paper. A three-dimensional (3D) finite element model (FEM) for the pile-soil system is established for impulse responses. Under saturated soil or unsaturated soil condition, several vibrating velocity-time histories at different depths in parallel hole are obtained based on the numerical simulation. It shows that the length of the pile and the one-dimensional (1D) P-wave velocity in the pile can be determined easily from the features of the mentioned velocity-time histories. By examining the slopes of the first arrival time plotted versus depth or the depth where the amplitude of the first arrival significantly decreases, the length of the pile can be determined. The effects of the 3D P-wave propagation through the saturated soil and the defect of the cemented soil column on the velocity-time histories are also investigated.

[1] Chopra, A.K., 2005. Dynamics of Structures: Theory and Applications to Earthquake Engineering (2nd Ed.). Prentice-Hall, Upper Saddle River, NJ.

[2] Chow, Y.K., Phoon, K.K., Chow, W.F., Wong, K.Y., 2003. Low strain integrity testing of piles: 3D effects. Journal of Geotechnical and Geoenvironmental Engineering, 129(11):1057-1062.

[3] Davis, A.G., 1995. Nondestructive evaluation of existing deep foundations. J. Perf. Constr. Fac., ASCE, 9(1):57-74.

[4] Davis, A.G., Hertlein, B.H., 1993. Evaluation of the Integrity of Some Large Concrete Structures Using NDT. American Concrete Institute Spring Convention, Vancouver.

[5] Davis, A.G., Evans, J.G., Hertlein, B.H., 1997. Nondestructive evaluation of concrete radioactive waste tanks. Journal of Performance of Constructed Facilities, 11(4):161-167.

[6] Finno, R.J., Osborn, P.W., 1997. Parallel Seismic Evaluation of the NDE Test Section at the National Geotechnical Experimentation Site at Northwestern University. Final Report to the Infrastructure Technology Institute. Http://www.iti.northwestern.edu/projects/NDE/pse_index.html

[7] Huang, J., Han, J., Porbaha, A., 2006. Two- and Three-dimensional Modeling of DM Columns Under Embankments. Geotechnical Engineering in the Information Technology Age. Proceeding of the Geocongress, ASCE. Atlanta.

[8] Küçükarslan, S., 2002. Time domain dynamic analysis of pile under impact loading. Soil Dynamics and Earthquake Engineering, 22(2):97-104.

[9] OEI (Olson Engineering Inc.), 2006. PS Method. Http://olsonengineering.com/xmlSite/methods/ps/techbrief_ps_web.pdf

[10] Olson, L.D., Jalinoos, F., Aouad, M.F., 1995. Determination of Unknown Subsurface Bridge Foundations. A Final Report prepared for NCHRP.

[11] Olson, L.D., Liu, M., Aouad, M.F., 1996. Borehole NDT techniques for unknown subsurface bridge foundation testing. Proc. of SPIE, 2946:10-16.