Volume 11 Issue 4
Oct.  2018
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De-gao Zou, Jing-mao Liu, Xian-jing Kong, Chen-guang Zhou, Qing-po Yang. 2018: A simple permanent deformation model of rockfill materials. Water Science and Engineering, 11(4): 302-309. doi: 10.1016/j.wse.2018.12.001
Citation: De-gao Zou, Jing-mao Liu, Xian-jing Kong, Chen-guang Zhou, Qing-po Yang. 2018: A simple permanent deformation model of rockfill materials. Water Science and Engineering, 11(4): 302-309. doi: 10.1016/j.wse.2018.12.001
shu

A simple permanent deformation model of rockfill materials

doi: 10.1016/j.wse.2018.12.001

  • a State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

  • b Shanghai Municipal Engineering Design Institute Co., Ltd., Shanghai 200092, China

Funds:  This work was supported by the National Key Research and Development Program of China (Grant No. 2017YFC0404904), the National Natural Science Foundation of China (Grants No. 51608095, 51779034, and 51678113),and the Fundamental Research Funds for the Central Universities (Grant No.DUT17ZD219).
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  • Corresponding author: Jing-mao Liu
  • Received Date: 2017-10-04
  • Rev Recd Date: 2018-04-06
    Abstract
  • Existing experimental results have shown that using a semi-log linear relationship between the permanent volumetric strain and cyclic number underestimates the volumetric deformation of rockfill materials with a large cyclic number, and that the error increases with the confining pressure. The existing permanent deformation models are not suitable for the seismic safety analysis of high dams during strong earthquakes. In this study, a series of large-scale triaxial cyclic loading tests of rockfill materials were performed, and a new permanent deformation model of rockfill materials was developed and validated with three kinds of rockfill materials. The results show that the proposed model can properly reflect the general features of the permanent deformation of rockfill materials. The main features of the model are as follows: (1) relations between the cyclic number and permanent volumetric/shear strain are described by hyperbolic functions, which can avoid underestimating the volumetric deformation occurring during strong earthquakes; (2) the model can capture the effect of the mean effective stress on the permanent volumetric strain, with greater confining pressure correlating to greater permanent volumetric deformation, and the permanent volumetric strain under low confining pressure near the dam crest can be well represented; and (3) the model can reflect the effect of the consolidation stress ratio on the permanent shear strain.

     

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