Volume 12 Issue 2
Jun.  2019
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Article Navigation >  Water Science and Engineering  > 2019  >  12(2): 155-161
Ji-xiang Huo, Fu-heng Ma, Xiao-lei Ji. 2019: Porosity and permeability variations of a dam curtain during dissolution. Water Science and Engineering, 12(2): 155-161. doi: 10.1016/j.wse.2019.05.007
Citation: Ji-xiang Huo, Fu-heng Ma, Xiao-lei Ji. 2019: Porosity and permeability variations of a dam curtain during dissolution. Water Science and Engineering, 12(2): 155-161. doi: 10.1016/j.wse.2019.05.007
shu

Porosity and permeability variations of a dam curtain during dissolution

doi: 10.1016/j.wse.2019.05.007

  • aState Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute,                     Nanjing 210029, China

  • bCollege of Construction Engineering,  Jiangsu Open University, Nanjing 210019, China

Funds:  This work was supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 51609150), the National Key Research and Development Program of China (Grant No. 2018YFC0407103), and the National Natural Science Foundation of China (Grant No. 51779155).
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  • Corresponding author: Ji-xiang Huo
  • Received Date: 2018-10-11
  • Rev Recd Date: 2019-04-20
    Abstract
  • During reservoir operation, the erosion effects of groundwater change the porosity and permeability of the dam curtain, causing changes to the seepage field. To understand where the changes take place and to what degree the porosity and permeability change, a multi-field coupling model was built and solved. The model takes into account seepage, solution concentration, and solid structure. The model was validated using uplift pressure monitoring data. Then, the variations in curtain porosity, seepage flow, and loss quantity of Ca(OH)2 were calculated. The key time nodes were obtained through curve fitting of the variation of seepage flow with the BiDoseResp function. The results showed that the model could reflect the attenuation trend of curtain performance well. The process and position of the erosion were not homogeneous. Although erosion mainly occurred at the top and bottom of the curtain, it was most developed at the top. The erosion effects developed slowly during the early stage, much fast during the middle and late stages, and culminated in complete dissolution. The model results and the daily monitoring data can provide a scientific basis for the safe operation and management of reservoirs.

     

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