{"title":"Numerical Study on the Cavity-Induced Piping Failure of Embankment","authors":"H. J. Kim, G. C. Park, K. C. Kim, J. H. Shin","volume":108,"journal":"International Journal of Geological and Environmental Engineering","pagesStart":1415,"pagesEnd":1420,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10003516","abstract":"Cavities are frequently found beneath conduits on pile
\r\nfoundations in old embankments. Cavity reduces seepage length
\r\nsignificantly and consequently causes piping failure of embankments.
\r\nCase studies of embankment failures indicate that the relative
\r\nsettlement between ground and pile supported-concrete conduit was
\r\nthe main reason of the cavity. In this paper, an attempt to simulate the
\r\ncavity-induced piping failure mechanism was made using finite
\r\nelement numerical method. Piping potential is examined by carrying
\r\nout parametric study for influencing factors such as cavity length,
\r\nwater level, and flow conditions. The concentration of hydraulic
\r\ngradient adjacent to cavity was found. It is found that the hydraulic
\r\ngradient close to the cavity exceeds considerably the critical hydraulic
\r\ngradient causing piping. Piping failure potential due to the existence of
\r\ncavity is evaluated and contour map for the potential risk of an
\r\nembankment for piping failure is proposed.","references":"[1] G. C. Park, \u201cA study on piping failure of levee using centrifuge model\r\ntest,\u201d Master Thesis (in Korean), 2014.\r\n[2] S.W. Jin, N.R. Kim, D.S. Kim, \u201cReproduction of piping failure due to the\r\npermeable layer using centrifuge test,\u201d Journal of the Korean Society of\r\nCivil Engineers, vol. 31, no. 1C, Jan. 2011, pp. 1-10.\r\n[3] J.M. Kim, B. H Choi, S.Y. Oh, K.M. Kim, \u201cNumerical studies for the\r\nsafety estimation of box-culvert in levee,\u201d Journal of Korea Water\r\nResources Association, vol. 39, no.6 Jun. 2006, pp. 479-486.\r\n[4] D. G. Fredlund, A. Xing, \u201cEquations for the soil-water characteristic\r\ncurve,\u201d Canadian Geotechnical Journal, vol. 31, no. 3, pp. 521-532, 1994.\r\n[5] K. H. Kim, G. C. Park, D. R. Kim, J. H. Shin, \u201cEvaluation of piping\r\nstability under dynamic conditions,\u201d in Proc. 8th International\r\nSymposium on Underground Construction in Soft Ground, Seoul, 2014,\r\npp. 91-95.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 108, 2015"}