Influence of sample preparation on the multi scale structure of sand-clay mixtures

Yin, Kexin; Fauchille, Anne‐Laure; Othmani, Khaoula; Sciarra, Giulio; Kotronis, Panagiotis; Benoit, Yannick; Bertrand, François; Branchu, Samuel

doi:10.1051/e3sconf/20199201007

Cited by 6 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

Section: Scanning Electron Microscope Testmentioning

confidence: 99%

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

et al. 2023

View full text Add to dashboard Cite

show abstract

“…2.2.4. Microstructure of Sand-Clay Mixture Clayey soils are multi-scale materials, and their macroscopic behavior is impacted by microstructure [28,30,[96][97][98][99]. The micromechanical behavior at the particle-scale level, such as particle rearrangements and force chain collapses, can affect the global macroscopic response.…”

Section: Transitional Fines Content (Fc T )mentioning

confidence: 99%

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

et al. 2021

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…The samples for the (interface) direct shear tests were prepared by the dry tamping method rather than other sample preparation techniques, such as wet tamping [20][21][22], slurry deposition [15,17,[23][24][25][26][27][28], due to the water was not considered in this paper. The average initial sample height for direct shear and interface direct tests are 31.59 mm and 27.58 mm, respectively.…”

Section: Interface Direct Shear Testmentioning

confidence: 99%

Interface Direct Shear Tests on JEZ-1 Mars Regolith Simulant

Yin

Liu

Jia-xing³

et al. 2021

Applied Sciences

View full text Add to dashboard Cite

The mechanical behaviors of Martian regolith-structure interfaces are of great significance for the design of rover, development of excavation tools, and construction of infrastructure in Mars exploration. This paper presents an experimental investigation on the properties of a Martian regolith simulant (JEZ-1) through one-dimensional oedometer test, direct shear test, and interface direct shear tests between JEZ-1 and steel plates with different roughness. Oedometer result reveals that the compression and swelling indexes of the JEZ-1 are quite low, thus it is a less compressible and lower swelling soil. The cohesion and adhesion of JEZ-1 are lower than 5 kPa. The values of the internal friction angle range from 39.7° to 40.6°, and the interface friction angles are 16.7° to 36.2° for the smooth and rough interface. Furthermore, the direct shear and interface direct shear results indicate that the interface friction angles are lower than the internal friction angles of JEZ-1 and increase close to the internal friction angles with increasing interface roughness.

show abstract

Influence of sample preparation on the multi scale structure of sand-clay mixtures

Cited by 6 publications

References 16 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

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

Interface Direct Shear Tests on JEZ-1 Mars Regolith Simulant

Contact Info

Product

Resources

About