Interface Direct Shear Tests on JEZ-1 Mars Regolith Simulant

Yin, Kexin; Liu, Jiangxin; Jia-xing, Lin; Vasilescu, Andreea-Roxana; Othmani, Khaoula; Filippo, Eugenia Di

doi:10.3390/app11157052

Cited by 14 publications

(5 citation statements)

References 29 publications

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“…Scanning electron microscope (SEM) is an effective method to investigate the microstructure of soils (Yin et al, 2019;Yin et al, 2021a;Yin et al, 2021b;Yin et al, 2021c;Yin, 2021). In order to further study the microstructure of the clogged drainage holes, SEM scans were performed on the inner and outer surfaces of the clogged drainage pipes at both ends (i.e., the outer and the inner pipe end).…”

Section: Scanning Electron Microscope Testmentioning

confidence: 99%

Study on the clogging mechanism of upward inclined drainage holes in cut slopes

et al. 2023

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Since groundwater is one of the main factors that affect the stability of highway slopes in mountainous regions, a smooth drainage is of importance for the safety of cut slopes. After years of service, the cut slopes of highway are often characterized with drainage problems or even drainage failures that threaten the stability and safety. In this paper, the clogging mechanism of drainage holes in highway cut slopes is firstly clarified through on-site survey. The soil and blockage samples are collected from typical slopes for laboratory tests and analysis, and the results reveal that all the blockages are made of fine-grained particles from the slopes. Scanning electron microscope (SEM) images indicate that the blockages penetrate the drainage pipe wrappings to form the clogging. The combined effect of clayey soil, chemicals, and biological clogging exacerbate the clogging process around the drainage pipes. Laboratory tests are also performed to simulate the CaCO3 crystal clogging around the drainage holes, and the microstructure of the clogged geotechnical screens and geotextiles is observed by scanning electron microscope as well. The results confirm that the amount of CaCO3 crystal attached to the drainage pipe surface increases with the time. The single-layer structure of screens does not facilitate the three-dimensional clogging as in the case of geotextiles. After soaking in diluted hydrochloric acid at a pH of 5.0, there is no significant decrease of CaCO3 crystals attached on the screens and geotextiles. However, the CaCO3 decrease is apparent after soaking in the hydrochloric acid at a pH of 3.0. The clogging of drainage holes can be classified into two stages according to the laboratory tests and acid soaking, and the relationship and characteristics between the two stages are summarized.

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Section: Scanning Electron Microscope Testmentioning

confidence: 99%

Study on the clogging mechanism of upward inclined drainage holes in cut slopes

et al. 2023

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“…Instead, for tensile loadings in which decohesion is the main cause of structure failure, nonlocal models [134] are very effective at keeping the boundary value problem elliptic. It is worth noting that strain localization in dry and saturated specimens has been studied experimentally by many researchers on loose sand as well as dense sand, demonstrating that frictional slip (mode II failure mode) is the dominant failure phenomenon [135][136][137]. It is also the main failure mechanism for geostructures in reality.…”

Section: Micropolar Theorymentioning

confidence: 99%

Methods for Solving Finite Element Mesh-Dependency Problems in Geotechnical Engineering—A Review

et al. 2022

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The instabilities of soil specimens in laboratory or soil made geotechnical structures in field are always numerically simulated by the classical continuum mechanics-based constitutive models with finite element method. However, finite element mesh dependency problems are inevitably encountered when the strain localized failure occurs especially in the post-bifurcation regime. In this paper, an attempt is made to summarize several main numerical regularization techniques used in alleviating the mesh dependency problems, i.e., viscosity theory, nonlocal theory, high-order gradient and micropolar theory. Their fundamentals as well as the advantages and limitations are presented, based on which the combinations of two or more regularization techniques are also suggested. For all the regularization techniques, at least one implicit or explicit parameter with length scale is necessary to preserve the ellipticity of the partial differential governing equations. It is worth noting that, however, the physical meanings and their relations between the length parameters in different regularization techniques are still an open question, and need to be further studied. Therefore, the micropolar theory or its combinations with other numerical methods are promising in the future.

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“…As can be seen in Figure 28, several soil particles become stuck in the valleys when the D 50 is less than the R max , which will reduce the roughness (R max ) of the interface, since the particles stuck in the bottom of the valleys are not mobilized during interface shearing. Following this approach, researchers performed interface direct shear tests with different types of soils and structural materials, considering the normalized roughness [11,108,136,146,150,151] or other roughness parameter such as R max [19,127,152] or R a [16,22,24,153]. R a is the arithmetic average of the absolute values of the profile heights over the evaluation length along the center line (also called center line average roughness).…”

Section: Influence Of Interface Roughnessmentioning

confidence: 99%

A Review of Sand–Clay Mixture and Soil–Structure Interface Direct Shear Test

et al. 2021

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Natural soils are usually heterogeneous and characterized with complex microstructures. Sand–clay mixtures are often used as simplified soils to investigate the mechanical properties of soils with various compositions (from clayey to sandy soils) in the laboratory. Performing laboratory tests on a sand–clay mixture with definite clay fraction can provide information to understand the simplified soils’ mechanical behavior and better predict natural soils’ behavior at the engineering scale. This paper reviews previous investigations on sand–clay mixture and soil–structure interface direct shear test. It finds that even though there are many investigations on sand–clay mixtures and soil–structure interfaces that consider pure sand or pure clay, limited data on the mechanical behavior of the interface between sand–clay mixture and structure materials are available. Knowledge is missing on how the clay content influences the mechanical behavior of interface and how the soil particles’ arrangement changes as the clay content increases. Further study should be performed to investigate the interface in terms of a reconstituted sand–clay mixture and structure by interface direct shear test, to highlight the influence of clay fraction on the interface response, under various loading conditions.

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Interface Direct Shear Tests on JEZ-1 Mars Regolith Simulant

Cited by 14 publications

References 29 publications

Study on the clogging mechanism of upward inclined drainage holes in cut slopes

Study on the clogging mechanism of upward inclined drainage holes in cut slopes

Methods for Solving Finite Element Mesh-Dependency Problems in Geotechnical Engineering—A Review

A Review of Sand–Clay Mixture and Soil–Structure Interface Direct Shear Test

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