Experimental Study on Air Expansion Deformation of Composite Geomembrane under Ring-Restrained Condition

Yu, Hairui; Li, Wanglin; Wei, Ruchun; Li, Chen

doi:10.1520/gtj20180381

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…Usman and Galler [10], through infrared spectroscopy, confirmed that the increased brittleness in aged PVC-P geomembranes in tunnels was predominantly due to substantial plasticizer loss. Yu and Chen [11] identified both artificial accelerated aging and atmospheric exposure aging as viable test methods for these materials. Chen et al [12] conducted indoor accelerated aging tests on PVC films, analyzing the effects of aging on their inelastic and viscoelastic properties.…”

Section: Introductionmentioning

confidence: 99%

Thermal Air Aging and Lifespan Prediction of PVC-P Geomembranes: An Arrhenius Equation-Based Approach

Zhang,

Liu,

et al. 2023

PEET

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Section: Introductionmentioning

confidence: 99%

Thermal Air Aging and Lifespan Prediction of PVC-P Geomembranes: An Arrhenius Equation-Based Approach

Zhang,

Liu,

et al. 2023

PEET

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“…In the research on the bulging deformation of horizontal impervious materials in plain reservoirs, there is little research on the mechanical properties of geotextile bulging deformation at present, and the related research is mainly embodied in geomembrane and composite geomembrane. Researchers conducted further research on composite geomembrane and found that its geotextile plays a protective role and has an important impact on the overall mechanical properties [2][3]. In the process of bulging deformation and failure of composite geomembrane, when the lower geomembrane bulges and deforms, the upper geotextile also bulges and destroys simultaneously [4].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on bulge deformation of geotextile under ring-restrained conditions

Yang,

Xue,

et al. 2023

J. meas. eng.

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Geotextile layers are arranged on and below the geomembrane to prevent the geomembrane from being punctured and damaged. The geotextile not only plays a role in physical protection, like anti-puncture but also makes a great difference to the mechanical properties of the geomembrane’s air expansion deformation. In this paper, the bulging deformation of geotextile is simplified as spherical bulging deformation under ring-restrained conditions. Using the special bulging deformation test equipment, the bulging deformation experiment of geotextile is realized, the main factors affecting the bulging deformation are analyzed, the law of bulging deformation and failure of geotextile is summarized, the failure mechanism of geotextile and the Influence of geotextile on the properties of geomembrane are discussed, and the following conclusions are drawn. The failure of bulging deformation of geotextiles belongs to tensile failure, which is characterized by fast speed and high strength. The typical failure mode is spindle-shaped cracks distributed along the crown, whose failure mechanism belongs to tensile failure produced in weak areas. The bulging deformation of the geotextile shows nonuniformity, with the largest deformation at the crown top and the smallest deformation at the ring constraint. When the geotextile is covered on the geomembrane, bulging pressure is shared by both the geomembrane and the geotextile. At the initial deformation stage, the geomembrane replaces it, and then the geotextile bears more internal pressure and plays a decisive role till destruction.

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“…Geomembranes, as impermeable materials, have been widely used in horizontal and impermeable systems of reservoirs, such as artificial lakes, reservoirs, and landfills, because of their good impermeability (permeability coefficients of 10-13 m/s), simple structure, and high elongation [1][2][3]. Moreover, impermeable geomembranes have always played an important role in environmental protection [4].…”

Section: Introductionmentioning

confidence: 99%

Research on Bidirectional Reservation Method for Anti-Permeation Geomembrane Slack

Wang,

Xue,

et al. 2023

Applied Sciences

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Geomembrane relaxation can effectively prevent the geomembrane from being damaged by tensile stresses caused by temperature changes and uneven settlement of the foundation. Existing and commonly used reservation methods, such as wave-shaped, groove-shaped, and Z-shaped techniques, are unidirectional and cannot resist multidirectional tensile stresses in geomembranes. Therefore, we propose three methods for reserving bidirectional geomembranes, including the cross-groove-shaped, cross-Z-shaped, and combined Z- and groove-shaped techniques. Additionally, we investigate the key issues of these methods and their practicality through field tests and theoretical analyses. The results of the study show that the cross-groove-shaped technique is prone to geomembrane folding at the corners of the cross-intersection, and it is necessary to set a wiping angle of approximately 35° to solve the problem. The cross-Z-shaped technique does not require grooving and reduces the amount of civil construction performed. However, the neoprene rods cannot be folded 180° or restored after being separated once. The combined Z- and groove-shaped technique has no folding phenomenon and does not require 180° of folding. With a lack of folding, including 180° folding, the number of grooves can be reduced by half, but the cross-Z-shaped specimen cannot be restored after separation. In practical applications, it is recommended to use the cross-groove-shaped method or to choose a suitable bidirectional reservation method according to the actual requirements.

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Experimental Study on Air Expansion Deformation of Composite Geomembrane under Ring-Restrained Condition

Cited by 4 publications

References 6 publications

Thermal Air Aging and Lifespan Prediction of PVC-P Geomembranes: An Arrhenius Equation-Based Approach

Thermal Air Aging and Lifespan Prediction of PVC-P Geomembranes: An Arrhenius Equation-Based Approach

Experimental study on bulge deformation of geotextile under ring-restrained conditions

Research on Bidirectional Reservation Method for Anti-Permeation Geomembrane Slack

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