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Volume 41 Issue 4
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CHEN Jian-sheng, LI Ping, WANG Tao, ZHAN Lu-cheng, YAN Jia-heng. Chemical dissolution of seepage around dam foundation of a reservoir in eastern margin of the Tibetan Plateau[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(4): 610-616. DOI: 10.11779/CJGE201904002
Citation: CHEN Jian-sheng, LI Ping, WANG Tao, ZHAN Lu-cheng, YAN Jia-heng. Chemical dissolution of seepage around dam foundation of a reservoir in eastern margin of the Tibetan Plateau[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(4): 610-616. DOI: 10.11779/CJGE201904002
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Chemical dissolution of seepage around dam foundation of a reservoir in eastern margin of the Tibetan Plateau

  • 1. Key Laboratory of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China;
    2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China

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  • Received Date: January 28, 2018
  • Published Date: April 24, 2019
    Graphical Abstract
    • Abstract
  • The foundation failure of a dam on the eastern margin of the Tibetan Plateau during seepage and chemical processes is studied. By using Cl- tracing, temperature-conductivity tracing and artificial tracing techniques, it is determined that there is leakage through the non-closed concrete cut-off wall, where the reservoir water leaks through the dam foundation, and excretes through the filter layer after the dam area. The acid dissolution experiment and X-ray fluorescence analysis show that the precipitated white particles on the surface after the dam are mainly composited of CaCO3. Combined with the chemical reaction process. It is confirmed that the precipitation comes from the cement of cut-off wall. The CO2 dissolved in the leakage water reacting with Ca(OH)2 in the cement can generate soluble Ca(HCO3)2, which is taken to the surface by the leakage water and decomposed to CaCO3 at normal temperature. Through the measurement and analysis of CO2 content in surface water, it is found that CO2 in the water-rock reaction has other sources except atmospheric precipitation. Considering the local geologic structure, it is inferred that CO2 mainly from the deep carbon pool enters the groundwater and reservoir water through the fault zones, and participates in the water-rock reaction. This results in a faster erosion of the dam. The chemical erosion of the dam and hydraulic structures will be greatly enhanced if the deep CO2 enters the groundwater and participates in the seepage process.
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    • References (19)
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