Experimental and analytical investigations on bearing capacity of strip footing in reinforced sand backfills and flexible retaining wall

Ahmadi, Hamzeh; Hajialilue-Bonab, Masoud

doi:10.1007/s11440-012-0165-8

Cited by 48 publications

(20 citation statements)

References 14 publications

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“…Through the transparent side walls, photographic images of the backfill at different stages of wall deformation can be captured for examination. Obtained images are analyzed using PIV method, which led to visualized passive failure surfaces [32][33][34][35][36]. The model retaining wall is an aluminium plate with rectangular cross-section.…”

Section: The Retaining Wall Modelmentioning

confidence: 99%

Determination of Passive Failure Surface Geometry for Cohesionless Backfills

Soltanbeigi

Altunbas

Gezgin

et al. 2020

Period. Polytech. Civil Eng.

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Correct determination of the passive failure surface geometry is necessary for the design of retaining structures. The conventional theories assume linear passive failure surfaces even though it is known that the actual failure surfaces are non-linear. Many researchers claimed the appropriateness of a hybrid curved-linear method. This approach estimates the curved section by a log-spiral function, which then connects to the backfill surface with the conventional linear assumption. The main drawback here is that the geometric properties of the hybrid mathematical function is not directly related to the mechanical properties of soils. Thus, this study attempts to provide a mechanical description for the assumed geometrical parameters. For this purpose, a series of 1 g small scale retaining wall model tests, simulating passive failure, are conducted on two different backfill soils. The relative density is varied in the model tests and the resultant peak friction angles of the backfills are calculated as functions of failure stress state and relative density using a well-known empirical equation. Transparent sidewalls allow for visualization of the failure surface evolution, which is obtained by capturing images and analysing then through Particle Image Velocimetry (PIV) technique. Subsequently, the quantified slip zones are fitted with the hybrid curved-linear approach. The relationships between the peak friction angle and the geometrical characteristics of the best-fit log-spiral and linear functions are investigated. Obtained results are used to propose a set of equations that allow the estimation of non-linear passive failure surfaces as function of peak friction angle.

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Section: The Retaining Wall Modelmentioning

confidence: 99%

Determination of Passive Failure Surface Geometry for Cohesionless Backfills

Soltanbeigi

Altunbas

Gezgin

et al. 2020

Period. Polytech. Civil Eng.

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“…However, due to the large upper load, the tensile stress of the bottom geotextile mat is significantly larger than that of the upper mat which is apparently over designed. It is found that the reinforcement effect of geotextiles depends not only on the performance of geotextiles but also on the number and spacing of geotextiles [20]. A new optimized design method is proposed in this study.…”

Section: Introductionmentioning

confidence: 99%

Optimized Design for Large Geotextile Mats over Soft Soil

Huang

Yang

et al. 2021

Advances in Civil Engineering

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In this paper, the failure mechanisms of large geotextile mats over soft soil are carried out through finite element analyses. A finite element model is generated and validated against centrifuge testing data and previously published data of numerical simulation. Parametric study is then carried out to investigate the geotextile tension distribution and the arrangement of crashed stone. Based on the parametric study, an optimized design considering the arrangement of rock berm and a special arrangement of large geotextiles was proposed to enhance the performance of the geotextile mats. The findings of this study can provide an engineering guidance for this new technique.

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“…It is a technical requirement to improve the uplift resistance of aeolian sand by foundation treatments. e beneficial effects of using geosynthetics to increase the bearing capacity of foundation have been clearly demonstrated by previous studies [2][3][4][5][6][7][8][9]. Dash et al [10] carried out indoor model tests on the reinforcement of sand bedsupport strip foundation with geogrid cushion and determined the layout depth, size of the geogrid layer, and the optimal length width ratio of geogrid bag supported strip foundation.…”

Section: Introductionmentioning

confidence: 99%

Uplift Bearing Capacity of Transmission Tower Foundation in Reinforced Aeolian Sand Using Simplified Model Tests

Ding

Cheng

Zheng

et al. 2021

Advances in Civil Engineering

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In order to analyze the uplift bearing capacity of transmission tower foundation in the geosythetic-reinforced aeolian sand, a series of simplified indoor modeling tests are carried out. A simplified reduced-scale foundation made according to the prototype and the uplift bearing capacity of transmission tower foundation in geosynthetic-reinforced aeolian sand is studied. Three kinds of reinforcement materials are embedded in the sand according to five ways of layout spacing. A total of 15 reinforcement schemes are tested. The results show that ultimate uplift bearing capacity of transmission tower foundation can be significantly improved by the reinforcement treatment of geotechnical materials in the aeolian sand. The type and spacing of reinforced materials also have a significant influence on the uplift bearing capacity of the foundation model in reinforced aeolian sand, and the effect of reinforcement works until the end of the loading process. The comprehensive effect is evaluated by the ratio of bearing capacity improvement and the total layer of reinforced materials. Based on the above results, the bearing mechanism of transmission tower foundation in geosynthetic-reinforced aeolian sand is elaborated and analyzed in detail.

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Experimental and analytical investigations on bearing capacity of strip footing in reinforced sand backfills and flexible retaining wall

Cited by 48 publications

References 14 publications

Determination of Passive Failure Surface Geometry for Cohesionless Backfills

Determination of Passive Failure Surface Geometry for Cohesionless Backfills

Optimized Design for Large Geotextile Mats over Soft Soil

Uplift Bearing Capacity of Transmission Tower Foundation in Reinforced Aeolian Sand Using Simplified Model Tests

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