Dynamic Shear Strength of a Needle-Punched GCL for Monotonic Loading

Fox, Patrick J.; Sura, Joseph M.; Nye, Christopher J.

doi:10.1061/(asce)gt.1943-5606.0001304

Cited by 14 publications

(5 citation statements)

References 19 publications

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“…Dynamic shear tests should be conducted in accordance with project-specific requirements. Recent data from Fox et al (2015) and Ross and Fox (2015) suggest that displacement rate effects for GCLs and GCL interfaces may be more complicated that previously considered and additional research is needed on this issue.…”

Section: Effect Of Consolidationmentioning

confidence: 97%

“…Peak strengths increased linearly with increasing log displacement rate for ó n,s ¼ 50 kPa and decreased linearly with increasing log displacement rate for ó n,s ¼ 520 kPa. The data of Fox et al (2015) show that, in the static range (R < 1 mm/ min), peak strengths for a W/NW NP GCL were approximately constant with increasing displacement rate ( Figure 13a). Large displacement strengths decreased with increasing displacement rate and this effect became more significant with increasing normal stress (Figure 13b).…”

Section: Effect Of Consolidationmentioning

confidence: 99%

“…Fox et al (1998a) suggested that failure at the W GT/bentonite interface would be drained, whereas Eid et al (1999) suggested that migration of bentonite into the W GT might reduce hydraulic conductivity and allow excess pore pressures to develop. Based on volume change and shear strength data over a wide range of normal stress levels and displacement rates, Fox et al (2015) and Ross and Fox (2015) concluded that excess pore pressures on the failure surface for GCL internal shear and GMX/NP GCL interface shear tests increased with increasing normal stress and displacement rate. In addition, Triplett and Fox (2001) measured small positive pore pressures for GM/NP GCL interfaces at peak shear strength.…”

Section: Static Shear Strengthmentioning

confidence: 99%

“…Monotonic shear Nye and Fox (2007) and Fox et al (2015) presented results from monotonic internal shear tests of a hydrated W/NW NP GCL conducted at four normal stress levels (ó n,s ¼ 141, 348, 692 and 1382 kPa) and seven displacement rates (R ¼ 0.1, 1, 10, 100, 1000, 10 000 mm/min and R max ). The maximum displacement rate (R max ) ranged from 30,000 mm/min at low normal stress to 25,000 mm/ min at high normal stress.…”

Section: Reinforced Gclsmentioning

confidence: 99%

See 3 more Smart Citations

State-of-the-art report: GCL shear strength and its measurement – ten-year update

Fox

Stark

2015

Geosynthetics International

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This paper presents an invited update to our 2004 state-of-the-art report and provides a comprehensive source of information on the shear strength and shear strength testing of geosynthetic clay liners (GCLs). Essential concepts of shear stress-displacement behavior and shear strength are presented, followed by detailed discussions on the laboratory measurement of the shear strength of GCLs and GCL interfaces. The paper also provides recommendations for the selection of design strength envelopes for stability analyses and checklists to assist users in the specification of GCL shear testing programs. North American practice is emphasized and discussions are focused primarily within the context of landfill bottom liner and cover systems. Conclusions and recommendations are provided with regard to GCL shear strength behavior and current GCL strength testing practice, improvements for GCL strength testing are suggested, and future research needs are identified.

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Section: Effect Of Consolidationmentioning

confidence: 97%

Section: Effect Of Consolidationmentioning

confidence: 99%

Section: Static Shear Strengthmentioning

confidence: 99%

Section: Reinforced Gclsmentioning

confidence: 99%

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State-of-the-art report: GCL shear strength and its measurement – ten-year update

Fox

Stark

2015

Geosynthetics International

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“…Shear stiffness and damping ratio are important metrics used to quantitatively study the dynamic properties of the geogrid-soil interface [29]. As Figure 9 shows, the shear stiffness K, which defines a reciprocal cycle, is calculated from Equation (1) and the damping ratio D is calculated from Equation (2): In the equation, τ 1 represents the maximum positive shear stress of the hysteresis loop, while τ 2 denotes the maximum negative shear stress of the hysteresis loop.…”

Section: Shear Stiffness and Damping Ratiomentioning

confidence: 99%

Experimental Study on Cyclic Shear Performance of the Four-Way Geogrid Reinforcement–Soil Interface

Zhang,

Ruan,

Jiang

2024

Applied Sciences

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This paper presents the results of horizontal cyclic direct shear tests at the reinforced soil interface of a four-way polypropylene geogrid reinforced sandy soil. The influence of normal stress and shear displacement amplitude on the shear stress, shear stiffness, and damping ratio of the reinforced soil interface are evaluated by varying the normal stress and shear displacement amplitude. Dynamic shear characteristics of reinforced soil interface under normal constant load were investigated by using a large dynamic straight shear apparatus. Peak interface strength increases with increasing amplitude of normal stress and shear displacement amplitude. The larger the normal stress and shear displacement amplitude, the fewer cycles are needed to attain peak interface strength. At low-magnitude normal stress levels, the peak shear stress and shear stiffness tend to stabilize after an initial increase during the cycling process, and the damping ratio decreases and then stabilizes with the increase in the number of cycles; whereas when the normal stress level is high, the peak shear stress and shear stiffness increase and then decrease during the cycling process and eventually stabilize, and the damping ratio decreases and then increases and finally stabilizes with the increase in the number of cycles. Moreover, under the same number of cycles, the corresponding shear stiffness decreases with an increase in shear displacement amplitude, while the damping ratio increases.

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Experimental Study of Static Shear Strength of Geomembrane/Geotextile Interface Under High Shear Rate

Shen

Chang

Feng

et al. 2018

Proceedings of GeoShanghai 2018 International Conference: Ground Improvement and Geosynthetics

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Dynamic Shear Strength of a Needle-Punched GCL for Monotonic Loading

Cited by 14 publications

References 19 publications

State-of-the-art report: GCL shear strength and its measurement – ten-year update

State-of-the-art report: GCL shear strength and its measurement – ten-year update

Experimental Study on Cyclic Shear Performance of the Four-Way Geogrid Reinforcement–Soil Interface

Experimental Study of Static Shear Strength of Geomembrane/Geotextile Interface Under High Shear Rate

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