Volume 8 Issue 2
Apr.  2015
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Article Navigation >  Water Science and Engineering  > 2015  >  8(2): 151-157
Jun HE, Yu WANG, Yong LI, Xiao-chen RUAN. 2015: Effects of leachate infiltration and desiccation cracks on hydraulic conductivity of compacted clay. Water Science and Engineering, 8(2): 151-157. doi: 10.1016/j.wse.2015.04.004
Citation: Jun HE, Yu WANG, Yong LI, Xiao-chen RUAN. 2015: Effects of leachate infiltration and desiccation cracks on hydraulic conductivity of compacted clay. Water Science and Engineering, 8(2): 151-157. doi: 10.1016/j.wse.2015.04.004
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Effects of leachate infiltration and desiccation cracks on hydraulic conductivity of compacted clay

doi: 10.1016/j.wse.2015.04.004

  • College of Civil and Architectural Engineering, Hubei University of Technology, Wuhan 430068, PR China

Funds:  This work was supported by the National Natural Science Foundation of China (Grant No. 51008120), the Youth Chenguang Project of Science and Technology of Wuhan City (Grant No. 201271031418), and the Outstanding Young Talent Program of Hubei Province (Grant No. 2010 CDA091).
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  • Corresponding author: Jun HE
  • Received Date: 2014-05-09
  • Rev Recd Date: 2014-12-30
    Abstract
  • Both cracks in clay liner and the complex composition of landfill leachate might have effects on the hydraulic conductivity of a compacted clay liner. In this study, the hydraulic conductivities of natural clay and bentonite-modified clay with and without desiccation cracks were measured, respectively, using three types of liquids as permeating liquid:   2 500 mg/L acetic acid solution, 0.5 mol/L CaCl2 solution, and tap water. When tap water was adopted as the permeating liquid, desiccation cracks resulted in increases in the average value of hydraulic conductivity: a 25-fold increase for the natural clay and a 5.7-fold increase for the bentonite-modified clay. It was also found out that the strong self-healing capability of bentonite helped to reduce the adverse impact of cracks on hydraulic performance. In contrast to tap water, simulated leachates (acetic acid and CaCl2 solutions) show no adverse effect on the hydraulic conductivities of natural and bentonite-modified clays. It is concluded that desiccation cracks and bentonite have more significant effects on hydraulic performance than simulated leachates.

     

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