Factors affecting the hydraulic performance of a geosynthetic clay liner overlap

Weerasinghe, Isuri; Gallage, Chaminda; Dawes, Les; Kendall, Preston

doi:10.1016/j.jenvman.2020.110978

Cited by 13 publications

(10 citation statements)

References 22 publications

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“…Australian researchers studied factors of influence on hydraulic characteristics of geosynthetic clay lining [9]. As the scientists noted: "The results of this study will help minimize failures of liner systems in barrier applications, such as landfills, mines, tailings dams, significantly reducing the potential risk of groundwater pollution.…”

Section: Resultsmentioning

confidence: 99%

Environmental safety in the field of construction and operation of hydraulic structures

et al. 2020

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The article deals with the environmental safety of construction production, as well as the process of operation using examples of hydraulic structures. The purpose of the article is to show the growing importance of taking into account environmental decisions and measures in the design of the construction project and operation manual. The objectives are to identify and systematize implemented examples of environmental solutions. The objects of the study are hydraulic structures: mooring, river and shelf. The tasks are solved by methods of searching for information on the issues under consideration as part of the analytical review, with further discussions and conclusions. It was revealed that in recent years, environmental expertise has become more stringent in assessing and allowing hydraulic facilities to begin construction and installation work and commissioning, due to the accumulated negative experience of accidents, flooding and other harmful environmental influences. As a result of the analytical review, we obtain generalized conclusions on modern trends in orienting new construction in the primary interests of environmental protection.

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Section: Resultsmentioning

confidence: 99%

Environmental safety in the field of construction and operation of hydraulic structures

et al. 2020

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“…The application of geosynthetics in the geo-environmental industry is increasing rapidly due to its vast number of applications (Cheah et al, 2016(Cheah et al, , 2017Gallage et al, 2019;Garcia et al, 2007;Jayalath et al, 2018;Weerasinghe et al, 2019aWeerasinghe et al, , 2020. Geosynthetic clay liners are one such composite geosynthetic product with a core of low-permeability sodium bentonite clay sandwiched between two geotextiles or adhesive bonded to a geomembrane.…”

Section: Introductionmentioning

confidence: 99%

“…The most significant challenge faced by the industry is the failure of the liner systems due to separation of panels on side slopes, separation of panels due to shrinkage, punctures and wrinkles, installation faults, liner design faults etc (Fox et al, 1998;Rowe, 2014;Rowe et al, 2017;Thiel et al, 2005). Hence, significant research is being carried out to investigate how the overall hydraulic performance of the GCL could be improved by maintaining its optimum capacity throughout the barrier application (Daniel et al, 1997;Egloffstein et al, 2012;Mazzieri et al, 2015;Rowe et al, 1997Rowe et al, , 2016Weerasinghe et al, 2020;Xiong et al, 2009). The main factors identified affecting the hydraulic conductivity of the GCL are the overburden confining stress, shrinkage effect occurring due to the temperature variation, chemical compatibility of the bentonite to restrict various permeants, wrinkle effect due to the overlying geomembrane, and side slope shear effects (Fox et al, 1998;Thiel et al, 2005;Weerasinghe et al, 2019a).…”

Section: Introductionmentioning

confidence: 99%

Effect of overburden confining stress on hydraulic performance of geosynthetic clay liners (GCLs)

Weerasinghe

Gallage

Dawes

2021

Heliyon

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Geosynthetic clay liners are a rapidly evolving geosynthetic product used in most hydraulic barrier applications in the geo-environmental industry. Continuous research has led to new insights to overcome the shortcomings faced in deploying GCLs in the field. These include shrinkage due to shear failure on side slopes, the effect of temperature variation, and inadequacy of minimum timely confinement to achieve optimum hydraulic performance. This paper presents previous experimental data and an additional dataset from this research gathered to observe the effect of overburden confining stress on GCL hydraulic conductivity and how the findings can be used to predict the performance of a geosynthetic clay liner for a given field application. An inverse power relationship is identified between these two parameters along with the reduction in the order of the degree of hydraulic conductivity depending on the permeant material passing through. A relationship is determined to estimate the GCL hydraulic conductivity as a function of the overburden confining stress, given that it is pre or post hydrated and the permeant liquid passing through the product. It is proposed that the relationship can be used to predict the GCL hydraulic performance in the field and provide guidance in improving the serviceability of hydraulic barrier designs.

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“…Well-constructed and maintained geotechnical structures are crucial for the economy of any country. It is mainly because these structures are integral parts of many civil engineering projects related to embankments [1-9], road and railways [10][11][12][13][14][15][16][17][18][19][20][21], landfills [22,23], costal protection [24][25][26] and tunnel construction [30][31][32]. Therefore, the accurate measurement of soil or earth pressure is essential in laboratory and field investigation on the performance, and health monitoring of these geostructures [30][31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Calibration of Earth Pressure Cells

Jayalath¹,

Wimalasena²

2021

GEOMATE

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Strain-gauge type soil pressure transducers are widely used in laboratory and field investigation on the performance, and health monitoring of geo-structures to accurately measure the soil pressure. Even though these pressure plates are sold with the factory-measured calibration factors, these sensors should be recalibrated in the laboratory before using them because the calibration can be affected by the data-logging system and the length of the cable used. Therefore, in this study, a laboratory calibration procedure for straingauge type soil pressure plates was proposed. The soil pressure transducer was embedded in a uniform-finesand medium in a specially designed pressure cylinder, and the pneumatic pressure was applied into the system as gradual increments. After that, the calibration chart of the pressure gauge was developed based on the sensor outputs for different pressures applied. Then the calibrated soil pressure transducer was used in the laboratory pavement model test to measure soil pressure at the base-subgrade interface under a surface loading area. The measured soil pressure values were compared with the estimated vertical stresses from elastic theories to validate the pressure measurements and the calibration process of the soil pressure transducer. Test results revealed that there is a satisfactory agreement between the pressure measured by the soil pressure transducer and theoretical estimations. Thus, the calibration process of the soil pressure transducer and its outputs are proven to be accurate.

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Factors affecting the hydraulic performance of a geosynthetic clay liner overlap

Cited by 13 publications

References 22 publications

Environmental safety in the field of construction and operation of hydraulic structures

Environmental safety in the field of construction and operation of hydraulic structures

Effect of overburden confining stress on hydraulic performance of geosynthetic clay liners (GCLs)

Laboratory Calibration of Earth Pressure Cells

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