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Volume 40 Issue 5
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WANG Guan-shi, LAI Yuan-ming, LONG Ping, HU Shi-li, HONG Ben-gen, GUI Yong. Calculation moisture content distribution around injection hole during in-situ leaching process of ion-adsorption rare earth mines[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(5): 910-917. DOI: 10.11779/CJGE201805016
Citation: WANG Guan-shi, LAI Yuan-ming, LONG Ping, HU Shi-li, HONG Ben-gen, GUI Yong. Calculation moisture content distribution around injection hole during in-situ leaching process of ion-adsorption rare earth mines[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(5): 910-917. DOI: 10.11779/CJGE201805016
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Calculation moisture content distribution around injection hole during in-situ leaching process of ion-adsorption rare earth mines

  • 1. Cold and Arid Regions Environment Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. School of Architectural and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
    3. School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China

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  • Revised Date: February 22, 2017
  • Published Date: May 24, 2018
    Graphical Abstract
    • Abstract
  • Ponding in injection hole will generate pressure head in soil surface. Considering the transfer of the pressure head through the soil, a basic equation for one-dimensional vertical infiltration under ponding is developed. The measured saturated hydraulic conductivity is regarded to be equivalent to that of one-dimensional infiltration, and the distribution rules of moisture content along the vertical direction of the injection hole of the hole bottem is calculated by the basic equation for one-dimensional vertical infiltration under ponding. Assuming that the moisture content increment is equal in each wetting front which is formed during infiltration process, and according to that the cumulative liquid injection is equal to the moisture increment in the wetted region, each wetting front is obtained. Considering with the moisture content distribution along the vertical direction of the injection hole of the hole bottom, the moisture content distribution in the wetted region is determined. A smooth ore block in Zudong rare earth mine in China is chosen to perform single-hole injection tests, and 4 measuring points are arranged around the injection hole. During the infiltration process, the moisture contents at measuring points are recorded by FDS-100 moisture sensors. By comparing the values calculated by the proposed model with the test ones, it is found that the correlation coefficient between the calculated values and the requirements is satisfactory. During the infiltration process, the moisture content distribution in the wetted region is calculated accurately by the established model.
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    • References (18)
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