Geogrid and Soil Displacement Observations During Pullout Using a Transparent Granular Soil

Bathurst, Richard J.; Ezzein, Fawzy M.

doi:10.1520/gtj20140145

Cited by 45 publications

(7 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The three types of transparent sand have no, or little, cohesion (≤1 kPa). Such transparent sand is mainly used in physical modeling tests, such as tests on deformation of soil mass around driven piles and uplift-resistant piles (Yuan et al, 2019;Zhou et al, 2019;Chen et al, 2020), stability of tunneling (Ahmed and Iskander, 2011a;Ahmed and Iskander, 2011b;Zhang et al, 2018), soil-geosynthetic interactions (Bathurst and Ezzein, 2015), deformation of simplified slopes under effects of water (Sui and Zheng, 2018;Maghsoudi et al, 2020) and pore flow characteristics of porous media (Serrano et al, 2011;Liang et al, 2019;Wu et al, 2020b).…”

Section: Introductionmentioning

confidence: 99%

Material Preparation and Geotechnical Properties of Transparent Cemented Soil for Physical Modeling

et al. 2021

View full text Add to dashboard Cite

The preparation of transparent materials suitable for simulating different rock and soil masses is the foundation for image-based physical modeling tests in studying deformation and failure mechanisms in geotechnical media. A transparent cemented soil (TCS) with similar geotechnical properties of natural soil and soft rock was prepared using fused quartz as the skeleton, hydrophobic fumed silica powder as the cement and mixed mineral oil of 15# white oil and n-dodecane as the pore fluid. Eleven groups of TCS samples with different shear strengths were synthesized by adjusting the content or mass ratio of the cement and particle size or gradation of the skeleton. Contrasting tests of unconsolidated-undrained triaxial compression were carried out and the mechanical characteristics of TCS were analyzed, showing that the stress-strain relationship, shear strength and failure mode of TCS are similar to those of natural soil. The mechanical parameters of TCS undergo complex variation with the factors, and the mesoscopic mechanism of the changes therein was revealed with the help of optical microscope photos. The similarity ratio of TCS to soft rock was derived according to geometries and stress conditions of laboratory model tests, demonstrating the feasibility of using TCS as similar materials to soft rock. Moreover, empirical formulas for the change of shear strength parameters with the factors were fitted to facilitate the preparation of TCS with target shear strength in the future. The findings can provide a basis for preparing transparent similar materials to natural soil and soft rock in physical modeling tests.

show abstract

Section: Introductionmentioning

confidence: 99%

Material Preparation and Geotechnical Properties of Transparent Cemented Soil for Physical Modeling

et al. 2021

View full text Add to dashboard Cite

show abstract

“…62,63 Digital image correlation (DIC) was utilized to monitor the displacement of geosynthetics and surrounding target grains. 43,64 This article uses simple image processing methods to study the influence zone of the interface.…”

Section: Introductionmentioning

confidence: 99%

Laboratory pullout test study on the influence zone of geosynthetics

Fei

et al. 2020

Journal of Engineered Fibers and Fabrics

View full text Add to dashboard Cite

Conventional pullout test devices are mainly designed to measure the shear strength indices of the geosynthetics–soil interface. This article introduces a new model container to study the influence zone of geosynthetics in pullout test. Several basic image processing methods were employed to analyze the grain motion of two gravel compositions in pullout tests. The trajectories of grains in the gravel differ at different heights; specifically, a more active motion was observed if the grain was closer to the geosynthetics. Moreover, grains were found to move not only horizontally but also vertically as well as to rotate on pulling out the geosynthetics. The range of a grain on the move is almost constant during the pullout and determines the influence zone of the geosynthetics. Image processing revealed that the influence zone was eight times the average grain size above the geosynthetics and 4–5 times the average grain size below the geosynthetics. The boundary condition thus significantly affects the influence zone.

show abstract

“…The literature review on pullout testing of extensible reinforcement (geogrids) and inextensible reinforcement (steel strips) shows several limitations of the current pullout box equipment (e.g., Palmeira 2009). One of the limitations is that the reinforcement and soil are not visible and so the pullout load acting throughout the reinforcement can only be recorded at the test apparatus boundaries, mostly at the front end of the specimen (Bathurst and Ezzein 2015). The relative soilreinforcement movement that occurs on the plane of the reinforcement cannot be determined quantitatively (Ezzein and Bathurst 2014).…”

Section: Introductionmentioning

confidence: 99%

Stress Distributions and Pullout Responses of Extensible and Inextensible Reinforcement in Soil Using Different Normal Loading Methods

Rahmaninezhad

Han

Kakrasul

et al. 2019

Geotechnical Testing Journal

View full text Add to dashboard Cite

In design of reinforced soil structures, pullout capacity of reinforcement in an anchorage zone is an important parameter for stability analysis. This parameter is generally quantified by conducting laboratory or field pullout tests. In the laboratory pullout test, the reinforcement is embedded in the soil mass at a normal stress, which is commonly applied by a pressurized airbag or a hydraulic jack through a rigid plate, and then a horizontal tensile force is applied to the reinforcement. This article reports an experimental study conducted to evaluate the effect of the load application method using an airbag with and without stiff wooden plates on the vertical stress distribution and the pullout capacities and deformations of extensible (geogrid) and inextensible reinforcement (steel strip) in the soil in a large pullout box. This study monitored the distributions of the vertical earth pressures at the top and bottom of the soil mass in the pullout box, and at the level of reinforcement using earth pressure cells. The measured earth pressures show that the airbag with stiff plates resulted in a nonuniform pressure distribution, whereas the tests with an airbag directly on the soil had an approximately uniform pressure distribution. The nonuniform pressure distribution resulting from the airbag with stiff plates reduced the pullout resistance of the reinforcement as compared with that using the same airbag without stiff plates.

show abstract

Geogrid and Soil Displacement Observations During Pullout Using a Transparent Granular Soil

Cited by 45 publications

References 16 publications

Material Preparation and Geotechnical Properties of Transparent Cemented Soil for Physical Modeling

Material Preparation and Geotechnical Properties of Transparent Cemented Soil for Physical Modeling

Laboratory pullout test study on the influence zone of geosynthetics

Stress Distributions and Pullout Responses of Extensible and Inextensible Reinforcement in Soil Using Different Normal Loading Methods

Contact Info

Product

Resources

About