Vertical Uplift Capacity of Equally Spaced Multiple Strip Anchors in Sand

Kumar, Jyant; Bhoi, Manas Kumar

doi:10.1007/s10706-008-9247-7

Cited by 13 publications

(3 citation statements)

References 15 publications

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“…Pullout capacity of anchors (P), define as maximum pullout load carried by anchor, depends on various factors, such as type, shape, size, depth and inclination of the anchor, embedment depth and subsoil condition. Therefore, the required pullout capacity of plate anchor systems can be enhanced by increasing the size and embedment depth of the anchor or improving backfill strength and density (Ganesh and Sahoo, 2016;Kumar and Bhoi, 2009;Liu et al, 2011;Rahimi, et al, 2018).…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

Displacement field around an uplifting innovated plate anchor

Sabermahani¹

2020

Acta Geodynamica Et Geomaterialia

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“…The uplift capacity of a buried anchor typically comprises of the weight of soil within the failure zone as well as frictional and/or cohesive resistance along the realized failure surface. The required uplift capacity of these systems can be enhanced by increasing the size and embedment depth of the anchor or improving backfill strength and density (Choudhury and Subba Rao, 2005;Kumar and Bhoi, 2009;Song et al, 2009;Vishwas and Kumar, 2011;Liu et al, 2012;Wang and O'Loughlin, 2014;Tian et a., 2014;Kumar, 2014, 2015;Ganesh and Sahoo, 2016;Khan et al, 2017;Moayedi and Mosallanezhad, 2017;Shin et al, 2016).…”

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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“…These anchors can be installed by excavating the ground to the required depth followed by back filling and compacting with a good quality soil (Kame et al 2012). A number of studies are available in literature on estimating the horizontal pullout resistance and uplift capacity of anchors, Das and Seeley (1975), Rowe (1978), Ovesen (1981), Dickin (1988), Geddes (1987,1989), Sarac (1989), Niroumand (2010), , Bildik and Laman (2010), Kumar and Bhoi (2009). However the literature pertaining to ultimate pullout resistance of group of two square anchors embedded in sand in a vertical plane is rather limited, and more often the studies are limited to analytical or experimental evaluation of single anchors.…”

Section: Introductionmentioning

confidence: 99%

Horizontal Pullout Capacity of a Group of Two Vertical Square Anchors Embedded in Medium Dense Sand

Raju

Pankaja

2018

AMM

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In the present study an attempt is made to evaluate the ultimate horizontal pullout capacity of group of two square anchors embedded in medium dense sand by conducting laboratory model tests. The size of the model box used in the present study is 1.2m lengthx0.75m width and 1.5m height. A series of experiments were conducted on single and group of anchors subjected to horizontal pullout load on mild steel square plates of size 10 cm and 15 cm were used .Clean dry local river sand was used in the present study. All the tests were carried out on dry clean sand with a relative density of 55% corresponding to medium dense state. The raining technique was adopted to prepare the sample in the model box to achieve the desired density. In the present study the ratio of H/B is equal to 5 and 6; where H = depth of embedment from top of tank to bottom of lower anchor, B=width of anchor. The parameter S/B is equal to 0,1,2; where S = clear spacing between the anchor, and B= width of anchor. It was found from the present study as H/B ratio increases the pull out capacity increases and also for each H/B ratio as the S/B ratio increases pull out capacity decreases due to decrease in passive resistance. In the present study the group efficiency factor was found which is defined as the ratio pull out capacity of group of anchors to the pull out capacity of single anchor. It was found that the group efficiency factor was found to be greater than 1 and further as S/B ratio increases the group efficiency factor decreases for same H/B ratio. Also as H/B increases the efficiency factor also increases. The anchor breakout factor (Nγ) was also found which tends to increase with increase in depth of embedment and decreases with clear spacing between the anchors. The present data was compared with that of published literature on single anchors and it was found to compare well.

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Vertical Uplift Capacity of Equally Spaced Multiple Strip Anchors in Sand

Cited by 13 publications

References 15 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

Horizontal Pullout Capacity of a Group of Two Vertical Square Anchors Embedded in Medium Dense Sand

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