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Evaluation of Post-Construction Changes in Soil Hydraulic Properties through Field Instrumentation and In Situ Testing
The hydrologic performance of evapotranspiration (ET) cover system for waste containment is significantly influenced by the hydraulic characteristics of cover soil such as saturated hydraulic conductivity (Ks), unsaturated hydraulic conductivity (KΨ), and soil water characteristic curve (SWCC). Due to environmental and field exposure conditions like freeze-thaw effect, wetting and drying cycle, plant root growth and death, along with animal and insect burrowing, these hydraulic properties of cover soil are highly susceptible to variation. Therefore, assessment of the changes in these soil hydraulic properties is vital for the evaluation of long-term cover performance. In this study, the hydraulic properties of ET cover soil were evaluated for three years of environmental and field exposure. The uniqueness of this study is highlighted by the non-destructive methodology, as destructive soil sampling was avoided to preserve the integrity of the cover system. Consequently, this study investigates the changes in the soil hydraulic properties based on field instrumentation and in situ testing in large-scale lysimeters constructed in the city of Denton landfill. Moisture and temperature sensors along with tensiometers were installed at the site in planned depth intervals. A Guelph permeameter was used to determine the field saturated hydraulic conductivity. The field investigation results indicated that Ks increased nearly 400 times the initial measurement, Van Genuchten’s α parameter increased by a factor of 41, and the n parameter decreased approximately 1.25 times the laboratory measured values after a three year span of field exposure. The results from this study establish the effect of hydraulic characteristic of soil on the cover hydrology and the potential implications for design considerations for long-term performance of the ET cover system for waste containment.
Evaluation of Post-Construction Changes in Soil Hydraulic Properties through Field Instrumentation and In Situ Testing
The hydrologic performance of evapotranspiration (ET) cover system for waste containment is significantly influenced by the hydraulic characteristics of cover soil such as saturated hydraulic conductivity (Ks), unsaturated hydraulic conductivity (KΨ), and soil water characteristic curve (SWCC). Due to environmental and field exposure conditions like freeze-thaw effect, wetting and drying cycle, plant root growth and death, along with animal and insect burrowing, these hydraulic properties of cover soil are highly susceptible to variation. Therefore, assessment of the changes in these soil hydraulic properties is vital for the evaluation of long-term cover performance. In this study, the hydraulic properties of ET cover soil were evaluated for three years of environmental and field exposure. The uniqueness of this study is highlighted by the non-destructive methodology, as destructive soil sampling was avoided to preserve the integrity of the cover system. Consequently, this study investigates the changes in the soil hydraulic properties based on field instrumentation and in situ testing in large-scale lysimeters constructed in the city of Denton landfill. Moisture and temperature sensors along with tensiometers were installed at the site in planned depth intervals. A Guelph permeameter was used to determine the field saturated hydraulic conductivity. The field investigation results indicated that Ks increased nearly 400 times the initial measurement, Van Genuchten’s α parameter increased by a factor of 41, and the n parameter decreased approximately 1.25 times the laboratory measured values after a three year span of field exposure. The results from this study establish the effect of hydraulic characteristic of soil on the cover hydrology and the potential implications for design considerations for long-term performance of the ET cover system for waste containment.
Evaluation of Post-Construction Changes in Soil Hydraulic Properties through Field Instrumentation and In Situ Testing
Alam, Md. Jobair Bin (author) / Hossain, Md. Sahadat (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 722-732
2019-03-21
Conference paper
Electronic Resource
English
| British Library Conference Proceedings | 2019
Soil behaviour through field instrumentation
| British Library Online Contents | 2005
Soil behaviour through field instrumentation
| Online Contents | 2005