Measurement of shear strength and interface parameters by multi-stage large-scale direct/interface shear and pull-out tests

Xu, Youwei; Williams, David J.; Serati, Mehdi

doi:10.1088/1361-6501/aacb8a

Cited by 7 publications

(5 citation statements)

References 17 publications

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“…The deformation increases with enhanced effective confining pressure. It is thought that the enhanced effective confining pressure limited the horizontal displacement of the hydrate-free specimens instead of the vertical displacement, weakening the expansion effect of the remolded specimens. ,, …”

Section: Experimental Results and Discussionmentioning

confidence: 99%

“…It is thought that the enhanced effective confining pressure limited the horizontal displacement of the hydrate-free specimens instead of the vertical displacement, weakening the expansion effect of the remolded specimens. 22,56,57 In the multistage triaxial loading tests, whether hydratebearing or hydrate-free specimens, as shown in Figure 11a,b, the two specimens both exhibited compression under different effective confining pressures. The compression ability of the specimen increases with enhanced effective confining pressure.…”

Section: Mechanical Comparison Between Single-stage and Multistagementioning

confidence: 99%

“…One disadvantage of this test is that multiple specimens need to be remolded to conduct triaxial loading tests under different effective confining pressures . In actual engineering, it is very difficult to obtain an in situ core bearing hydrate, and its fabric and internal skeleton structure could be disturbed during the coring and transferring process . Therefore, we need to efficiently use limited specimens, reduce the number of artificial disturbances, and ensure the accuracy of the test results.…”

Section: Introductionmentioning

confidence: 99%

“…21 In actual engineering, it is very difficult to obtain an in situ core bearing hydrate, and its fabric and internal skeleton structure could be disturbed during the coring and transferring process. 22 Therefore, we need to efficiently use limited specimens, reduce the number of artificial disturbances, and ensure the accuracy of the test results. In geotechnical tests, a multistage triaxial loading test can obtain the strengths and volumetric strains of marine soil by consolidating and shearing a specimen under different effective confining pressures.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Characteristics of the Hydrate-Bearing Sediments in the South China Sea Using a Multistage Triaxial Loading Test

Dejun

et al. 2021

Energy Fuels

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Methane hydrate is being widely considered as an energy source by countries worldwide due to its to environmentally friendly and large reserves. However, during the exploitation process, a series of geological engineering disasters can be induced. Therefore, it is necessary to comprehensively study the mechanical characteristics of methane hydrate before commencing with commercial development. Many researchers have used conventional single-stage triaxial loading tests to study the mechanical characteristics of hydrate-bearing sediments, and these have the disadvantages of being time-consuming and labor-intensive. A multistage triaxial loading test can shear a single specimen under different effective confining pressures to obtain a series of mechanical parameters (strength, cohesion, internal frictional angle, etc.). In this study, a high-pressure and low-temperature triaxial apparatus was used to perform multistage and single-stage triaxial loading tests under effective confining pressures of 0.25, 0.5, and 1 MPa, and the specimens were remolded from the South China Sea had porosities of approximately 40% and a hydrate saturation of approximately 30%. The results show that under the relatively low effective confining pressure (0.25 and 0.5 MPa) the stress−strain and volumetric strain− axial strain curves between multistage and single-stage triaxial loading tests are highly coincident, and stress accumulation and compaction seem to have little effect on the strength and volumetric strain in the multistage triaxial loading test. However, under a relatively high effective confining pressure (1 MPa), the stress−strain and volumetric strain−axial strain curves of the two methods present a certain difference. In addition, the elastic modulus obtained by the multistage triaxial loading tests was larger than that from the single-stage triaxial loading tests due to stress accumulation and compaction.

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Section: Experimental Results and Discussionmentioning

confidence: 99%

Section: Mechanical Comparison Between Single-stage and Multistagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical Characteristics of the Hydrate-Bearing Sediments in the South China Sea Using a Multistage Triaxial Loading Test

Dejun

et al. 2021

Energy Fuels

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“…The corresponding tests are mainly interface direct shear and pull-out tests 3 , 6 , 7 . Comparing direct shear test and pull-out test results, Xu et al 8 found that the direct shear strength τs, interfacial shear strength τds, and pull-out shear strength τp of a geogrid-compacted soil interface were similar. However, since the direct shear test is used to study the interfacial characteristics of reinforced soil, it can reflect only the interfacial strength of the reinforcing material and the soil and not the tensile strength of the reinforcing material or the strength of the whole soil body 9 .…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the interface characteristics of geogrid-reinforced gravelly soil based on pull-out tests

Liu,

Pan,

Liu

et al. 2024

Sci Rep

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The factors influencing geogrid–soil interface characteristics are critical design parameters in some geotechnical designs. This study describes pull-out tests performed on gravelly soils commonly encountered in the Xinjiang region and reinforced with two types of geogrids. The factors affecting the geogrid–gravelly soil interface properties are investigated with different experimental loading methods (pull-out velocity, normal stress), geogrid types, and soil particle size distributions and water contents. The ultimate pull-out force increases with the normal stress and pull-out velocity. Furthermore, with increasing coarse particle content and water content, the ultimate pull-out force increases and then decreases sharply. Based on these research results, this paper provides reasonable parameters and recommendations for the design and pull-out testing of reinforced soil in engineering structures. In reinforced soil structure design, the grid depth should be increased appropriately, and the coarse particle content of the overlying soil should be between 30 and 40%. During construction, the gravelly soil should be compacted to the maximum compaction at the optimal water content, and the structure should have a reasonable waterproofing system. According to the calculation results of the interface strength parameters, the uniaxial geogrid–gravelly soil interface has a high cohesive force csg, which should not be ignored in reinforced soil structure design.

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Shear Strength of Poorly Graded Granular Material in Multi-Stage Direct Shear Test

Park

Nguyen²,

Tran³

et al. 2023

Environmental Science and Engineering

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Measurement of shear strength and interface parameters by multi-stage large-scale direct/interface shear and pull-out tests

Cited by 7 publications

References 17 publications

Mechanical Characteristics of the Hydrate-Bearing Sediments in the South China Sea Using a Multistage Triaxial Loading Test

Mechanical Characteristics of the Hydrate-Bearing Sediments in the South China Sea Using a Multistage Triaxial Loading Test

Experimental study on the interface characteristics of geogrid-reinforced gravelly soil based on pull-out tests

Shear Strength of Poorly Graded Granular Material in Multi-Stage Direct Shear Test

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