Recent Results of French Research on Reinforced Earth

Schlosser, F; Long, N T

doi:10.1061/jcceaz.0000429

Cited by 70 publications

(7 citation statements)

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“…Investigations on this type of behavior are looking for the percentages of clay (or sand) at which there is a change in the mixture's structure (i.e., the threshold clay content). In Table 1, a summary of previous results [31,33,42,45,50,[75][76][77][78][79][80][81] is collected: it shows the percentages of sand or clay in the mixture above or under which the mixture's behavior is controlled by the sand or the clay or both. Consequently, laboratory tests on these types of mixtures indicate that their shear strength depends upon the relative concentrations of the large particles and the clay.…”

Section: Fines Contentmentioning

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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Section: Fines Contentmentioning

confidence: 99%

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

et al. 2021

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“…In order to reduce the boundary effect, a stiffness reduction factor of 0.5 was used to consider the flexible constraint of the cylindrical wall; however, a stiffness amplification factor of 5.0 was adopted for the two loading plates to realize the axial rigid loading. Based on the equivalent confining stress concept [14] and the pseudo-cohesion concept [15], the triaxial compression test is commonly used to study the mechanical responses of the geosynthetics-reinforced soil structure. To date, there is a lack of research on layered geosynthetics-granule-clay reinforced structures under triaxial compression.…”

Section: Dem Modelingmentioning

confidence: 99%

“…(a) (b) Based on the equivalent confining stress concept [14] and the pseudo-cohesion concept [15], the triaxial compression test is commonly used to study the mechanical responses of the geosynthetics-reinforced soil structure. To date, there is a lack of research on layered geosynthetics-granule-clay reinforced structures under triaxial compression.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Layered Geogrids–Sand–Clay Reinforced Structures under Triaxial Compression by Discrete Element Method

et al. 2021

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Compared with the commonest geosynthetics-reinforced soil structures, layered geogrids–sand–clay reinforced (LGSCR) structures (School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang 110870, China) can replace granular materials with clay as the primary backfill material. Up until now, the performance of LGSCR structures under triaxial compression has been unclear. In this paper, the discrete element method was used to simulate the triaxial compression test on the LGSCR samples. Based on the particle flow software PFC3D, three types of cluster particle-simulated sand and the reinforced joints of the geogrid were constructed by secondary development. The effects of the geogrid embedment in sand layers, the number and thickness of sand layers in relation to the deviatoric stress, and the axial strain and the shear strength index of the LGSCR samples were analyzed. The results showed that laying the sand layers in the samples can improve their post-peak strain-softening characteristics and increase their peak strengths under a high confining pressure. A geogrid embedment in sand layers can further enhance the ductility and peak strength of the samples, and in terms of the shear strength index, there is a 41.6% to 54.8% increase in the apparent cohesion of the samples.

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“…The solid phase of the soil-rock mixture is composed of coarse particles and fine particles, with great differences in mechanical properties, particle size, and chemical composition (Schlosser and Long, 1974). Its physical and mechanical properties have a bigger difference than those of single soil and rock.…”

Section: Introductionmentioning

confidence: 99%

Shear Characteristics of Gravel Soil With Different Fillers

Zhang

Luo²,

Yuan

et al. 2022

Front. Mater.

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In recent years, China has established many large water conservancy projects in the western mountainous areas. However, dam foundation excavation produces a huge amount of waste rock mixture. A soil-rock mixture with unique structural characteristics can easily cause geological disasters, such as collapse, landslide, and debris flow following an earthquake, rainfall, and engineering disturbance. Therefore, research on the strength and shear characteristics of the soil-rock mixture is beneficial to avoiding soil-rock mixture disasters. In this study, the soil-rock mixture in the slag dump site of Jinping Hydropower station is taken as the research object. The influence of different fillers on the gravel soil shear characteristics is investigated through a large-scale triaxial test of coarse-grained soil. The slope stability of the slag dump site is analyzed using Midas GTS. Then, the most unfavorable sliding surface of the slag dump site is discovered and the slope stability coefficient under the most unfavorable conditions is calculated. The results lay a scientific foundation for the design and construction of a slag dump slope.

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Recent Results of French Research on Reinforced Earth

Cited by 70 publications

References 0 publications

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

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

Analysis of Layered Geogrids–Sand–Clay Reinforced Structures under Triaxial Compression by Discrete Element Method

Shear Characteristics of Gravel Soil With Different Fillers

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