Geosynthetic-reinforced soil structures with concave facing profile

Vahedifard, Farshid; Shahrokhabadi, Shahriar; Leshchinsky, Dov

doi:10.1016/j.geotexmem.2016.01.004

Cited by 22 publications

(8 citation statements)

References 15 publications

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“…However, it is encouraged to extend the proposed framework to elasto-plastic materials. In addition, it may be useful if the proposed studies could be implemented to retaining structures, MSE walls, and Concave Geosynthetic-Reinforced Soil Structures (CGRSS) [61]. The third part of this study briefly reviewed the implementation of GA/PSO in the foundation designs.…”

Section: Discussion and Recommendationsmentioning

confidence: 99%

A Review: Evolutionary Computations (GA and PSO) in Geotechnical Engineering

Andrab¹,

Hekmat²,

Yusop³

2017

CWEEE

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This study briefly reviews the application of Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) in geotechnical engineering since GA and PSO are widely used in civil engineering. The application of GA and PSO is studied in three popular families of geotechnical problems including unconfined seepage analysis, slope stability analysis, and foundation design. In each category the available results from different studies are reviewed and compared. The comparison of results shows the desirable accuracy in the predicting of optimal values in the process of analysis and design. The presented methods perform successfully in the reviewed problems. However, PSO predicts the optimum values in fewer numbers of iterations, which suggests higher performance in term of implementation/application.

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Section: Discussion and Recommendationsmentioning

confidence: 99%

A Review: Evolutionary Computations (GA and PSO) in Geotechnical Engineering

Andrab¹,

Hekmat²,

Yusop³

2017

CWEEE

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“…Formula (6) indicates that, for a given seepage velocity and density slope, the permeability pressure is inversely proportional to the permeability coefficient. The permeability coefficients for the eight soil-soilbag arrangements were all nearly 2 times that of the soil itself.…”

Section: Calculating the Equivalent Permeability Coefficients For Soimentioning

confidence: 99%

“…These soilbags can be paved in a given arrangement to reinforce a foundation. At present [1][2], soilbag technology has been widely applied in civil engineering, water conservancy, port maintenance, road traffic, and other large projects [3][4][5][6]. Guanglu Li's research group applied polypropylene geotextile bags in terraced field ridges and walls and studied the economic benefit, failure mode and stability of this method [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Permeability and stability of soilbags in slope protection structures

Zhou¹,

Wang²,

Wang³

et al. 2018

IJHT

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Farmland drainage ditch slumps restrict recirculation of water resources in the irrigation area of Ningxia in China. To address this problem, soilbags are applied for farmland drainage ditch slope protection, because of their double efficacy in solid slope collapse prevention and water purification. Variations in the mean flow rate, weight of soil passing through the geotextile, and gradient ratio were analyzed based on filtration criteria. Filtration and permeability performance of soilbag technology was studied using a clogging and permeability test, which was performed with gradient ratio and penetration test instruments. Different hydraulic gradients and building structures were tested. The clogging test shows that a rapid increase in the hydraulic gradient can decrease the permeability coefficient of the soil-geotextiles system by 77.99%, lower filtration, reduce soil content per unit area, and increase leakage. The influence of the size of the soilbag (two different sizes were tested) and their arrangement was investigated. Penetration tests demonstrated that an overlapped structure with staggered joints significantly reduced the overall permeability coefficient. With a smaller bag size, the permeability coefficient of structure was larger. The permeability coefficient ratio with different bag arrangements was as high as 90.75%. The results indicate that flow through a soilbag structure is governed solely by the gaps between neighboring containers and that flow through the soil in the containers can be neglected. The arrangement of soilbags thus strongly affects the permeability of the structure. Combining these results with a masonry plan for slope protection in engineering applications with soilbags, the equivalent permeability coefficient of the soilbag slope protection increased 100% and seepage pressure decreased 50%, which effectively improved the stability of the slope protection. These results provide a theoretical basis for further engineering applications.

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“…Along with continuous advances in construction technology and equipment, the proposed concave profiles for engineered slopes can be used in practice for native soils in applications such as cut slopes, trenches, open mine excavations, or when cohesion and/or an equivalent support system can legitimately be used for long term design purposes. Potential applications may include rock slopes, earth retaining systems (e.g., Vahedifard et al 2016a), cemented/stabilized fill slopes. Cohesion should be accounted for design purposes with great caution and only when its value can be reliably assessed during the life span of the slope (e.g., in cemented soils or native soils).…”

Section: Formulation and Proposed Frameworkmentioning

confidence: 99%

“…Recent advances in auto-guided construction equipment along with increased precession in three-dimensional mapping technology allow and facilitate construction of such concave profiles in engineered slopes and earth structures (Jeldes et al 2013;Jeldes et al 2014). For geosynthetic-reinforced soil structures, Vahedifard et al (2016a) showed that D r a f t 4 using concave facing profiles can decrease the required tensile strength of the reinforcement by up to 30% under static and seismic conditions.…”

Section: Introductionmentioning

confidence: 99%

Optimal profile for concave slopes under static and seismic conditions

2016

Self Cite

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This study presents a methodology to determine the stability and optimal profile for slopes with concave cross section under static and seismic conditions. Concave profiles are observed in some natural slopes suggesting that such geometry is a more stable configuration. In this study, the profile of a concave slope was idealized by a circular arc defined by a single variable, the mid-chord offset (MCO). The proposed concave profile formulation was incorporated into a limit equilibrium–based log spiral slope stability method. Stability charts are presented to show the stability number, MCO, and mode of failure for homogeneous slopes corresponding to the most stable configuration under static and pseudostatic conditions. It is shown that concave profiles can significantly improve the stability of slopes. Under seismic conditions, the impact of concavity is most pronounced. Good agreement was demonstrated upon comparison of the results from the proposed method against those attended from a rigorous upper bound limit analysis. The proposed methodology, along with recent advances in construction technology, can be employed to use concave profiles in trenches, open mine excavations, earth retaining systems, and naturally cemented and stabilized soil slopes. The results presented provide a useful tool for preliminary evaluation for adopting such concave profiles in practice.

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Geosynthetic-reinforced soil structures with concave facing profile

Cited by 22 publications

References 15 publications

A Review: Evolutionary Computations (GA and PSO) in Geotechnical Engineering

A Review: Evolutionary Computations (GA and PSO) in Geotechnical Engineering

Permeability and stability of soilbags in slope protection structures

Optimal profile for concave slopes under static and seismic conditions

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