Geomechanics and Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Modeling the wetting deformation behavior of rockfill dams

  • Guo, Wanli (Geotechnical Engineering Department, Nanjing Hydraulic Research Institute) ;
  • Chen, Ge (Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University) ;
  • Wu, Yingli (Geotechnical Engineering Department, Nanjing Hydraulic Research Institute) ;
  • Wang, Junjie (Key Laboratory for Hydraulic and Waterway Engineering of Ministry of Education, Chongqing Jiaotong University)
  • Received : 2019.10.25
  • Accepted : 2020.08.18
  • Published : 2020.09.25
⟨ Previous Next ⟩

Abstract

A mathematical wetting model is usually used to predict the deformation of core wall rockfill dams induced by the wetting effect. In this paper, a series of wetting triaxial tests on a rockfill was conducted using a large-sized triaxial apparatus, and the wetting deformation behavior of the rockfill was studied. The wetting strains were found to be related to the confining pressure and shear stress levels, and two empirical equations, which are regarded as the proposed mathematical wetting model, were proposed to express these properties. The stress and deformation of a core wall rockfill dam was studied by using finite element analysis and the proposed wetting model. On the one hand, the simulations of the wetting model can estimate well the observed wetting strains of the upstream rockfill of the dam, which demonstrated that the proposed wetting model is applicable to express the wetting deformation behavior of the rockfill specimen. On the other hand, the simulated additional deformation of the dam induced by the wetting effect is thought to be reasonable according to practical engineering experience, which indicates the potential of the model in dam engineering.

Keywords

References

  1. Ameen, A.M.S., Ibrahim, Z. and Othman, F. (2017), "Three-dimensional seismic response analysis for a rockfill dam", J. Comput. Theor. Nanosci., 14(12), 6003-6013. https://doi.org/10.1166/jctn.2017.7048.
  2. Bauer, E., Fu, Z.Z. and Liu, S.H. (2010), "Hypoplastic constitutive modelling of wetting deformation of weathered rockfill materials", Front. Archit. Civ. Eng. China, 4(1), 78-91. https://doi.org/10.1007/s11709-010-0011-8.
  3. Chen, X.Y., Yan, H.Z. and Liu, X.X. (2011), "Study on engineering characteristics of highly weathered weak rock", Adv. Mater. Res., 261-263, 1309-1312. https://doi.org/10.4028/www.scientific.net/AMR.261-263.1309.
  4. Duncan, J.M. and Chang, C. (1970), "Nonlinear analysis of stress and strain in soils", J. Soil Mech. Found. Div., 96(SM5), 1629-1653. https://doi.org/10.1061/JSFEAQ.0001458
  5. Duncan, J.M., Byrne, P., Wong, K. and Marbry, P. (1980), "Strength, stress strain and bulk modulus parameters for finite element analyses of stresses and movements in soil masses", University of California, Berkeley, California, U.S.A.
  6. Escuder, I., Andreu, J. and Rechea, M. (2005), "An analysis of stress-strain behaviour and wetting effects on quarried", Can. Geotech. J., 42(1), 51-60. https://doi.org/10.1139/t04-071.
  7. Fu, Z.Z., Liu, S.H. and Gu, W.X. (2011), "Evaluating the wetting induced deformation of rockfill dams using a hypoplastic constitutive model", Adv. Mater. Res., 243-249, 4564-4568. https://doi.org/10.4028/www.scientific.net/AMR.243-249.4564.
  8. GB/T 50123. (2019), Standard for Geotechnical Testing Method, China Planning Press, Beijing, China. (in Chinese)
  9. Karalar, M. and Cavusli, M. (2019), "Examination of 3D long-term viscoplastic behaviour of a CFR dam using special material models", Geomech. Eng., 17(2), 119-131. https://doi.org/10.12989/gae.2019.17.2.119.
  10. Li, G., Wang, L. and Mi, Z. (2004), "Research on stress-strain behaviour of soil core rockfill dam", Chin. J. Rock Mech. Eng., 23(8), 1363-1369 (in Chinese). https://doi.org/10.3321/j.issn:1000-6915.2004.08.025
  11. Lu, Y.Y., Gao, Z.P. and Zhu, J.G. (2014), "Effect of wetting deformation on behavior of earth rockfill dam", J. Yangzhou Univ. Nat. Sci. Ed., 17(3), 64-68, 73 (in Chinese).
  12. Nobari, E.S. and Duncan, J.M. (1972), "Effect of reservoir filling on stresses and movements in earth and rockfill dams", No. TE-72-1, University of California, Berekely, U.S.A.
  13. Nobari, E.S. and Duncan, J.M. (1973), "Movements in dams due to reservoir filling", Proceedings of the ASCE Specialty Conference on Performance of Earth and Earth -supported Structure, Lafayette, Pennsylvania, U.S.A.
  14. Oldecop, L.A. and Alonso, E. (2007), "Theoretical investigation of the time-dependent behaviour of rockfill", Geotechnique, 57(3), 289-301. https://doi.org/10.1680/geot.2007.57.3.289.
  15. Pramthawee, P., Jongpradist, P. and Sukkarak, R. (2017), "Integration of creep into a modified hardening soil model for time-dependent analysis of a high rockfill dam", Comput. Geotech., 91, 104-116. https://doi.org/10.1016/j.compgeo.2017.07.008.
  16. Raisianzadeh, J., Mohammadi, S. and Mirghasemi, A.A. (2019), "Micromechanical study of particle breakage in 2D angular rockfill media using combined DEM and XFEM", Granul. Matter, 21(3), 48. https://doi.org/10.1007/s10035-019-0904-8.
  17. Reza, M., Ali, A. and Behrouz, G. (2015), "Simulation of collapse settlement of first filling in a high rockfill dam", Eng. Geol., 187, 32-44. https://doi.org/10.1016/j.enggeo.2014.12.013.
  18. Sukkarak, R., Pramthawee, P., Jongpradist, P., Kongkitkul, W. and Jamsawang, P. (2018), "Deformation analysis of high CFRD considering the scaling effects", Geomech. Eng., 14(3), 211-224. https://doi.org/10.12989/gae.2018.14.3.211.
  19. Wang, T., Liu, S. and Lu, Y. (2019), "Laboratory experiments on the improvement of rockfill materials with composite grout", Geomech. Eng., 17(3), 307-316. https://doi.org/10.12989/gae.2019.17.3.307.
  20. Xiao, Y. and Liu, H. (2017), "Elastoplastic constitutive model for rockfill materials considering particle breakage", Int. J. Geomech., 17(1), 04016041. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000681.
  21. Zhao Z. L., Zhu J.G., Du Q. and Al Sakran, M.A. (2018), "Wetting deformation of coarse-grained materials in triaxial test", Hydro Sci. Eng., (6), 84-91 (in Chinese).
  22. Zhou, X., Chi, S. and Jia, Y. (2019), "Wetting deformation of core-wall rockfill dams", Int. J. Geomech., 19(8), 4019084. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001444.
  23. Zuo Y.M. and Shen Z.J. (1989), "Determination of deformation character of gravel sand due to wetting", Hydro Sci. Eng., (1), 107-113 (in Chinese).