Development of Modified Interface Apparatus and Prototype Cyclic Simple Shear Test Considering Chemical and Thermal Effects

Kwak, Chan; Park, I. J.; Park, J. B.

doi:10.1520/gtj20140223

Cited by 3 publications

(3 citation statements)

References 31 publications

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“…The development of new apparatus and the performance of a few cyclic simple shear tests were accomplished in a previous study [27]. In the present study, 72 sets of cyclic simple shear tests were conducted, and the results of the cyclic simple shear tests are presented and analyzed.…”

Section: Laboratory Testmentioning

confidence: 96%

“…Figure 3 describes the outline and the shear-box details of the M-PIA. The structure and technical items are explained in the studies by Kwak et al [27]. The materials in the test of the geosynthetic-soil interface were the geosynthetics and the granular soil.…”

Section: Test Apparatus and Conditionsmentioning

confidence: 99%

“…Figure 3 describes the outline and the shear-box details of the M-PIA. The structure and technical items are explained in the studies by Kwak et al [27].…”

Section: Test Apparatus and Conditionsmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic Shear Degradation of Geosynthetic–Soil Interface in Waste Landfill Sites

et al. 2017

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Geosynthetics and soil particles inevitably come into contact, resulting in a geosynthetic-soil interface. The discontinuity of the materials at the interface causes an intricate shear response, especially under dynamic loads. In the present study, the effects of chemical aggressors of the leachate from a waste landfill site on the cyclic shear behaviors of a geosynthetic-soil interface were investigated. The MultiPurpose Interface Apparatus (M-PIA) that can simulate cyclic simple shear conditions was utilized, and 72 sets of cyclic simple shear tests were conducted. The Disturbed State Concept (DSC) was employed to quantitatively estimate the shear stress degradation. As a result, new disturbance functions and parameters that represent the characteristics of the dynamic shear degradation at the interface were evaluated. Additionally, a numerical back-prediction was performed to verify the accuracy and applicability of the DSC parameters. Numerical interpolation procedures were suggested and enabled to reproduce the degradation successfully. Consequently, a general methodology was established to estimate the cyclic shear stress degradation of the geosynthetic-soil interface in consideration of chemical effects.

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Section: Laboratory Testmentioning

confidence: 96%

Section: Test Apparatus and Conditionsmentioning

confidence: 99%

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Dynamic Shear Degradation of Geosynthetic–Soil Interface in Waste Landfill Sites

et al. 2017

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A Narrow Wall System to Capture Temperature Stress–Strain Behavior in Paste Backfill

Ting

Hasan

Sahdi

et al. 2020

Geotechnical Testing Journal

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Placing mine tailings back into underground mined-out stopes is becoming increasingly used internationally because it improves ore recovery, reduces dilution of valuable ore, and increases environmental benefits due to the reduced size of the storage facilities of surface tailings. In recent years, a number of stopes backfilled with cemented paste backfill have been instrumented with load cells and piezometers to improve our understanding of in situ behavior. Many of these studies have reported results that show increases in measured total stresses when there is no increase in applied load, i.e., even when the backfilling process has been long completed. One explanation is that these stress increases result from expansive volume changes of the backfill as it hydrates and generates heat. This article proposes and describes a novel laboratory apparatus called a narrow wall system to investigate this hypothesis, focusing on modeling narrow stopes as these are relatively common in backfill applications. Results from the experiments agree qualitatively with the reported field observations, showing clear increases in measured pressure during periods of temperature increase. The article concludes that the proposed narrow wall system works effectively and has been able to capture the temperature stress-strain behavior of paste backfill. Thus, the temperature effect hypothesis has now been supported by evidence. Using the system, further studies related to geometrical or scale effects are suggested. The results are important for academics and engineers to improve backfill design in mining operations.

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A Novel Multifunctional Ring Shear Apparatus for Investigating the Interface Strength Characteristics of Liner Systems

Liu

Shi

Zhang

et al. 2023

Geotechnical Testing Journal

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A novel multifunctional ring shear apparatus is introduced in this paper, which is developed for investigating the interface strength characteristics of liner systems in various waste containment and other facilities. Annular specimens with a 300-mm inner diameter and a 500-mm outer diameter are tested by the apparatus. This apparatus consists of four components: (1) the vertical loading system, (2) the torsional shearing system, (3) the multifunctional shearing box, and (4) the process control and data acquisition system. The advantages of this apparatus are as follows: (1) The specimen can be tested both in displacement control and stress control, during which the normal stress is maintained or varied as needed. (2) The maximum normal stress and shear stress that can be loaded are 2.39 and 2.59 MPa, respectively. (3) The shear displacement is unlimited and the real-time shear displacement of each interface in the liner system can be obtained. (4) Special nail plate panels are developed for clamping different types of geosynthetics. A new adaptive telescopic pressure plate device is also developed for testing other materials, such as the clay layer and sand layer, and adapting to its compression deformation without lateral deformation. The performance of the apparatus is comprehensively evaluated by the conventional shear mode experiment and mode switching shear experiment of the textured geomembrane/geotextile interface and the conventional shear experiment of the composite liner system.

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Development of Modified Interface Apparatus and Prototype Cyclic Simple Shear Test Considering Chemical and Thermal Effects

Cited by 3 publications

References 31 publications

Dynamic Shear Degradation of Geosynthetic–Soil Interface in Waste Landfill Sites

Dynamic Shear Degradation of Geosynthetic–Soil Interface in Waste Landfill Sites

A Narrow Wall System to Capture Temperature Stress–Strain Behavior in Paste Backfill

A Novel Multifunctional Ring Shear Apparatus for Investigating the Interface Strength Characteristics of Liner Systems

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