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| Hydraulic performance of GCL under wet-dry cycling concurrent with municipal solid waste leachate permeation |
| WANG Bao1,2, CHEN Bin3, DOU Tong-tong1, GE Bi-zhou1, WANG Lou4 |
1. School of Environmental&Municipal Engineering, Xi'an University of Architecture and Technology, Xi′an 710055, China;
2. Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China;
3. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi′an 710055, China;
4. Xi'an Branch of China Urban Construction Design&Research Institute Co., Ltd., Xi′an 710054, China |
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Abstract Laboratory free swell and hydraulic conductivity tests were conducted to assess the effect of wet-dry cycling concurrent with landfill leachate permeation on the swell index of bentonite and hydraulic performance of a geosynthetic clay liner (GCL). Wet-dry cycling concurrent with leachate permeation had a significantly detrimental effect on the swell index of bentonite and hydraulic performance of GCL. The swell index of bentonite decreased from 20mL/2g to 7.5mL/2g and the hydraulic conductivity of GCL increased from 1.65×10-11m/s to 1.89×10-7m/s. The decrease in the swell index of bentonite and the increase in hydraulic conductivity of GCL should be attributed to the loss of osmotic swell of bentonite. The GCL continuously permeated with municipal solid waste leachate maintained a low k during the entire study duration. Increasing the effective stress from 20 to 150kPa caused the hydraulic conductivity of GCL to decrease by almost 4orders of magnitude and lower than the maximum value (5.0×10-11m/s) allowed for GCL used in municipal solid waste landfill.
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Received: 18 July 2019
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