Model studies of uplift capacity behavior of square plate anchors in geogrid-reinforced sand

Keskin, Mehmet Salih

doi:10.12989/gae.2015.8.4.595

Cited by 19 publications

(6 citation statements)

References 25 publications

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“…1-Anchor pullout capacity increases as embedment ratio increases (Ball, 1961;Dickin and Laman, 2007;Dickin, 1988Dickin, , 1994Frydman and Shaham, 1989;Keskin, 2015;Krishnaswamy and Parashar, 1994;Murray and Geddes, 1989;Rowe and Davis, 1982;Sakai and Tanaka, 1998;Sergeev and Savchenko, 1972). 2-Rate of pullout capacity increase due to embedment ratio increase is greater in dense sand rather than loose sand (Dickin and Laman, 2007;Krishnaswamy and Parashar, 1994;Murray and Geddes, 1989;Rowe and Davis, 1982;Sergeev and Savchenko, 1972).…”

Section: Variablementioning

confidence: 99%

Displacement field around an uplifting innovated plate anchor

Sabermahani¹

2020

Acta Geodynamica Et Geomaterialia

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This paper introduces an innovated plate anchor, increasing its bearing section area during uplift. In this experimental study, the influences of embedment depth of plate anchor and soil surface condition (restricted or free) on sand deformation field during uplift test are investigated. In order to study the soil deformation around the anchor, Particle Image Velocimetry (PIV) is used. The experimental setup consists of a camera, a new designed box, load cell, encoder and computer. During the uplift test on physical models, images are captured and used by PIV to depict the soil displacement field. Based on this study, it is found that pullout capacity and sand deformation zone are significantly influenced by anchor embedment depth. In shallow anchors, sand deformation zone lines are similar to a curve and cross the soil surface; however, in deep anchors, sand deformation zone is a bulb-shaped zone that extends from anchor to a distance of approximately two times its diameter above. Soil surface restriction increases anchor pullout capacity in shallow anchors up to 37 %, but in deep ones, there is no significant difference. Soil surface restriction changes shallow anchor behavior to deep anchors; however, it has no notable influence on deep anchors.

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Section: Variablementioning

confidence: 99%

Displacement field around an uplifting innovated plate anchor

Sabermahani¹

2020

Acta Geodynamica Et Geomaterialia

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“…Employing large or deeply embedded anchors may not always be economical or practical means of obtaining the required anchor capacity. An alternative approach is to use smaller and/or less embedded anchors beneath geosynthetic reinforcements (Krishnaswamy and Parashar, 1994;Ilamparuthi andDickin, 2001, Ghosh andBera, 2010;Keskin, 2015). There is some insight into the load-bearing behavior of soil reinforced by geogrids and geotextiles (Binquet and Lee, 1975;Yetimoglu et al, 1994;Karpurapu and Bathurst, 1995;Dash et al, 2003;Moghaddas Tafreshi and Rahimi, 2012;Tran et al, 2013;Vahedifard et al, 2016;Ouria andMahmoudi, 2018, Dawson andLee, 1988;Jones et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the uplift capacity of plate anchors in geocell-reinforced sand

Rahimi

Tafreshi

Leshchinsky

et al. 2018

Geotextiles and Geomembranes

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Plate anchors are frequently used to provide resistance against uplift forces. This paper describes the reinforcing effects of a geocell-reinforced soil layer on uplift behaviour of anchor plates. The uplift tests were conducted in a test pit at near full-scale on anchor plates with widths between 150 and 300 mm with embedment depths of 1.5 to 3 times the anchor width for both unreinforced and geocell-reinforced backfill. A single geocell layer with pocket size 110 mm×110 mm and height 100 mm, fabricated from non-perforated and nonwoven geotextile, was used. The results show that the peak and residual uplift capacities of anchor models were highest when the geocell layer over the anchor was used, but with increasing anchor size and embedment depth, the benefit of the geocell reinforcement deceases. Peak loads between 130% and 155% of unreinforced conditions were observed when geocell reinforcement was present. Residual loading increased from 75% to 225% that of the unreinforced scenario. The reinforced anchor system could undergo larger upward displacements before peak loading occurred. These improvements may be attributed to the geocell reinforcement distributing stress to a wider area than the unreinforced case during uplift. The breakout factor increases with embedment depth and decreased with increasing anchor width for both unreinforced and reinforced conditions, the latter yielding larger breakout factors. Calibrated numerical modelling demonstrated favorable agreement with experimental observations, providing insight into detailed behavior of the system. For example, surface heave decreased by over 80% when geocell was present because of a much more efficient stress distribution imparted by the presence of the geocell layer.

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“…Based on the orientation of anchors, the analysis of anchors can take one of two forms in general, namely vertical anchors or horizontal anchors. Although very recently some excellent researches were conducted on the uplift response of horizontal anchors by Niroumand and Kassim (2013), Keskin (2015), Demir and Bahadir (2015), Bhattacharya and Roy (2016) etc., this type of anchor is not the topic of interest here, and thus will not be reviewed. The vertical anchor is the subject of interest in this paper.…”

Section: Introductionmentioning

confidence: 99%

Pullout resistance of concrete anchor block embedded in cohesionless soil

Khan¹,

Mostofa²,

Jadid³

2017

Geomech. Eng.

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The anchor block is a specially designed concrete member intended to withstand pullout or thrust forces from backfill material of an internally stabilized anchored earth retaining wall by passive resistance of soil in front of the block. This study presents small-scale laboratory experimental works to investigate the pullout capacity of a concrete anchor block embedded in air dry sand and located at different distances from yielding boundary wall. The experimental setup consists of a large tank made of fiberglass sheets and steel framing system. A series of tests was carried out in the tank to investigate the load-displacement behavior of anchor block. Experimental results are then compared with the theoretical approaches suggested by different researchers and codes. The appropriate placement of an anchor block and the passive resistance coefficient, that is multiplied by the passive resistance in front of the anchor block to obtain the pullout capacity of the anchor, were also studied.

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Model studies of uplift capacity behavior of square plate anchors in geogrid-reinforced sand

Cited by 19 publications

References 25 publications

Displacement field around an uplifting innovated plate anchor

Displacement field around an uplifting innovated plate anchor

Experimental and numerical investigation of the uplift capacity of plate anchors in geocell-reinforced sand

Pullout resistance of concrete anchor block embedded in cohesionless soil

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