Evaluation of pullout and drainage properties of geosynthetic reinforcements in weathered granite backfill soils

Yoo, Hee Koo; Kim, Hong Taek; Jeon, Han Yong

doi:10.1007/bf02876002

Cited by 5 publications

(8 citation statements)

References 3 publications

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“…It is recommended for a two-phase analysis to be performed, including a total stress analysis that ignores the reinforcement lateral drainage and an effective stress analysis that accounts for full lateral drainage. Tensile strength, pullout resistance, drainage, and filtration are the main characteristics that should be considered when selecting a geosynthetic material for marginal backfill [32].…”

Section: Marginal Backfill Soilmentioning

confidence: 99%

Geosynthetic Reinforced Steep Slopes: Current Technology in the United States

et al. 2019

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Geosynthetics is a crucial mechanism in which the earth structures can be mechanically stabilized through strength enforcing tensile reinforcement. Moreover, geosynthetic reinforcement stabilizes steep slopes through incorporating the polymeric materials, becoming one of the most cost-effective methods in not only accommodating budgetary restrictions but also alleviating space constraints. In order to explicate on the applicability and widen the understanding of geosynthetic reinforcement technology, a synthesis study was conducted on geosynthetic reinforced steep slope. This study is very important because in not only highlighting the advantages and limitations of using geosynthetic reinforcement but also in investigating the current construction and design methods with a view to determining which best practices can be employed. Furthermore, this study also identified and assessed the optimal condition of the soil, performance measures, construction specifications, design criteria, and geometry of the slope. To further concretize the understanding of these parameters or factors, two case studies were reviewed and a summary of the best practices, existing methods, and recommendations were drawn in order to inform the employment of geosynthetics in reinforcing steep slopes.

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Section: Marginal Backfill Soilmentioning

confidence: 99%

Geosynthetic Reinforced Steep Slopes: Current Technology in the United States

et al. 2019

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“…Christopher and Stulgis 2005;Berg et al 2009). Limited studies such as those by Zornberg and Kang (2005), Yoo et al (2007) and Clancy and Naughton (2011) also investigated factors such as the influence of loading rate and type of geosynthetic reinforcement on the interface strength.…”

Section: Introductionmentioning

confidence: 97%

“…However, studies on the influence of matric suction on unsaturated soil-geosynthetic interface properties have been fairly limited. Nevertheless, reported work on the influence of the soil gravimetric water content (GWC) on the soil-reinforcement and soilgeomembrane interface strength such as those by Chua et al (1993), Ellithy and Gabr (2000), Lee and Bobet (2005), Zornberg and Kang (2005), Abu-Farsakh et al (2007), Hossain and Sakai (2007), Yoo et al (2007), Clancy and Naughton (2011), Hatami et al (2008Hatami et al ( , 2010Hatami et al ( , 2012Hatami et al ( , 2013Hatami et al ( , 2014 and Esmaili et al (2014) through direct interface shear and/or pullout tests has consistently indicated that the interface shear strength can be reduced significantly at higher moisture contents (by as much as 60-70%), especially in marginal quality soils containing considerable amount of fines (e.g. greater than 15%; e.g.…”

Section: Introductionmentioning

confidence: 98%

“…Zornberg and Kang 2005;Yoo et al 2007) interesting in that pullout resistance of geogrids primarily depends on their interlocking with the surrounding soil. However, results reported in these studies seem to indicate that in fine-grained soils, the added drainage capability of a geocomposite could more than compensate the interlocking hindrance due to the existence of a nonwoven geotextile, which is consistent with the findings of other related studies on marginal quality soils (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Unsaturated soil–woven geotextile interface strength properties from small-scale pullout and interface tests

Hatami

Esmaili

2015

Geosynthetics International

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One main concern related to the performance of unsaturated soils during the construction and service life of earthen structures is loss of matric suction due to the seasonal variations of gravimetric water content (GWC), ground water infiltration and possible development of excess pore water pressure. In addition to reducing the soil shear strength, loss of matric suction as a result of wetting could also reduce the soil-reinforcement interface shear strength in comparison with the as-built value at a lower GWC. This paper presents the results of small-scale pullout and interface tests on a woven geotextile reinforcement material in different marginal soils in order to quantify the difference in the soil-geotextile interface shear strength as a function of GWC for practical applications. A moisture reduction factor [MRF ¼ ì(ø)] is used to account for the reduction in the soil-geotextile interface shear strength as a function of matric suction over a range of GWC values that includes the dry and wet sides of the soil optimum gravimetric water content (GWC opt ) or optimum moisture content (OMC). It was observed that the interface shear strength of geotextile reinforcement in marginal soils could be significantly lower (e.g. by as much 50%) at only 2% wet of optimum (i.e. OMC+2%) in comparison with OMCÀ2%, which is assumed to represent the as-built condition.

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“…This in turn allows increasing the reinforced-wall height without the need for external lateral support (e.g. heavy gravity walls constructed by substantial concrete material [3]). The decent endurance of the polymeric material against erosion has made it a better choice in reinforcing earth structures [4].…”

Section: Introductionmentioning

confidence: 99%

A Modified Harmony Search Algorithm for the Optimum Design of Earth Walls Reinforced with Non-uniform Geosynthetic Layers

Nejad

Manahiloh

2015

Int. J. of Geosynth. and Ground Eng.

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Traditional design and construction of reinforced earth walls assumes uniform length and spacing of reinforcements. Even though the assumption simplifies the design and construction efforts, the inherently conservative approaches followed in picking the final values for the reinforcement length and spacing result in unnecessarily big construction costs. This paper presents an improved harmony search-based approach that can be adopted to optimize the design of Geosynthetic-reinforced earth walls. An existing improved harmony search algorithm is modified into a new harmony search algorithm by extending its capabilities to consider permutation-based operations for interdependent variables. The involved optimization procedures are discussed in a step-wise approach. This novel approach allows the consideration of non-uniform length and spacing for the reinforcement layers. As such, length of the Geosynthetic reinforcement and the spacing between adjacent Geosynthetic layers are taken as the design variables to be manipulated until the cost of construction is optimized. Static and dynamic loads are considered. the application of the proposed optimization technique is demonstrated on Geosynthetic-reinforced earth walls of height 5, 7 and 9 m. The extent of cost saving is assessed by comparing the results of this work and previous work. The previous work selected for comparison uses harmony search algorithm to optimize the design and construction of Earth Walls reinforced with uniform length-and spacing-Geosynthetic layers. The IHS-based optimization resulted in Cost reduction of up to 11 %. Keywords Geosynthetics Á Reinforced earth walls Á Metaheuristic Á Improved harmony search algorithm (IHSA) Á Optimization Á Pitch adjustment rate (PAR) Á Harmony consideration rate (HCR)

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Evaluation of pullout and drainage properties of geosynthetic reinforcements in weathered granite backfill soils

Cited by 5 publications

References 3 publications

Geosynthetic Reinforced Steep Slopes: Current Technology in the United States

Geosynthetic Reinforced Steep Slopes: Current Technology in the United States

Unsaturated soil–woven geotextile interface strength properties from small-scale pullout and interface tests

A Modified Harmony Search Algorithm for the Optimum Design of Earth Walls Reinforced with Non-uniform Geosynthetic Layers

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