Advertisement

Experimental Study on the Rheological Property of Compacted Clay and Its Influence on the Stress and Deformation of the Core-Wall Dam

  • Zhi-zhou Geng
  • Kai Xu
  • Zhiqiang Wu
  • En-yue Ji
Conference paper

Abstract

The secondary consolidation rate of compacted clay and rockfills has been proven to be relatively close, however, only the rheological property of the rockfill is considered in commonly used finite element analysis of core-wall dams. Therefore, the rheological property of the compacted clay and its influence on the stress and deformation of the Core-wall dam is discussed in this paper. The coefficient of secondary consolidation of unsaturated clay is significantly larger than that of saturated clay, and when the clay is saturated, the coefficient of secondary consolidation increases with the increasing loading. Both the unidirectional compression and triaxial compression rheological tests can be used to determine the rheological parameters and the results are relatively close. The finite element analysis indicates that the rheological deformation of clay core-wall has a considerable influence on the stress and deformation of the dam, e.g., causing higher stress levels and larger settlement especially around the core-wall. Hence, the rheological property of clay core-wall cannot be ignored in finite element analysis.

Keywords

Core-wall dam Compacted clay Unidirectional compression test Triaxial compression test Secondary consolidation coefficient 

References

  1. 1.
    Guo, W.L., Zhu, J.G., Peng, W.M.: Study on dilatancy equation and generalized plastic constitutive model for coarse-grained soil. Chin. J. Geotech. Eng. (2017). http://kns.cnki.net/kcms/detail/32.1124.TU.20170630.1121.008.html. (in Chinese)
  2. 2.
    Feng, B.L., Niu, J.D., Yang, Q.F.: The coefficient of secondary consolidation of soft clay determined by full automatic consolidation test system. Geotech. Invest. Surv. 39(3), 11–14 (2011). (in Chinese)Google Scholar
  3. 3.
    Wang, J.J., Zhang, H.P., Tang, S.C., Liang, Y.: Effects of particle size distribution on shear strength of accumulation soil. J. Geotech. Geoenviron. Eng. 139(11), 1994–1997 (2013)CrossRefGoogle Scholar
  4. 4.
    Chen, L.H., Chen, Z.Y., Zhang, J.P., et al.: Study on high pore pressure in clay core-wall of earth dam in Xiaolangdi Project. J. Hydraul. Eng. 36(2), 219–224 (2005). (in Chinese)Google Scholar
  5. 5.
    Murdoch, L.C.: Mechanical analysis of idealized shallow hydraulic fracture. J. Geotech. Geoenviron. Eng. 128(6), 488–495 (2002)CrossRefGoogle Scholar
  6. 6.
    MacDonald, T.C., Langridge-Monopolis, J.: Breaching charateristics of dam failures. J. Hydraul. Eng. 110(5), 567–586 (1984)CrossRefGoogle Scholar
  7. 7.
    Feng, X.Y., Xu, Z.P.: Centrifugal model study on mechanism of hydraulic fracturing of clay core-wall in rockfill dams. J. Hydraul. Eng. 40(10), 1259–1263 (2009)Google Scholar
  8. 8.
    Guo, W.L., Zhu, J.G., Yin, J.H., et al.: Investigation into the effects of the thickness of a hollow-cylinder soil specimen on the stress distributions in triaxial torsional shear testing. Geotech. Test. J. 39(5), 786–794 (2016)CrossRefGoogle Scholar
  9. 9.
    Li, Y., Xia, C.C.: Time-dependent tests on intact rocks in uniaxial compression. Int. J. Rock Mech. Min. Sci. 37(3), 467–475 (2000)CrossRefGoogle Scholar
  10. 10.
    Xia, C.C., Wang, X.D., Xu, C.B., et al.: Method to identify rheological models by unified rheological model theory and case study. Chin. J. Rock Mech. Eng. 27(8), 1594–1600 (2008). (in Chinese)Google Scholar
  11. 11.
    Zhao, Y.L., Cao, P., Wang, W., et al.: Viscoelasto-plastic rheological experiment under circular increment step load and unload and nonlinear creep model of soft rocks. J. Cent. South Univ. Technol. 16(3), 488–494 (2009)CrossRefGoogle Scholar
  12. 12.
    Zhao, Y.L., Cao, P., Wang, W.: Rock cracks subcritical propagation test and compression-shear rheological fracture model. J. Cent. South Univ. (Sci. Technol.) 45(1), 276–286 (2014)Google Scholar
  13. 13.
    Shen, Z.J.: Back analysis of deformation of Lubuge earth core rockfill dam. Chin. J. Rock Mech. Eng. 16(3), 1–13 (1994). (in Chinese)Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Zhi-zhou Geng
    • 1
    • 2
  • Kai Xu
    • 1
    • 2
  • Zhiqiang Wu
    • 1
    • 2
  • En-yue Ji
    • 1
    • 3
  1. 1.Geotechnical Engineering DepartmentNanjing Hydraulic Research InstituteNanjingChina
  2. 2.State Key Lab of Hydrology-Water Resources and Hydraulic EngineeringNanjingChina
  3. 3.Key Laboratory of Ministry of Education for Geomechanics and Embankment EngineeringHohai UniversityNanjingPeople’s Republic of China

Personalised recommendations