Pullout resistance of concrete anchor block embedded in cohesionless soil

Khan, Abdul Jabbar; Mostofa, Golam; Jadid, Rowshon

doi:10.12989/gae.2017.12.4.675

Cited by 12 publications

(2 citation statements)

References 18 publications

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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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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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“…This study mainly focuses on grouted anchors in soil. A grouted soil anchor is a composite system composed of an anchoring section (bolt and grout), surrounding soil mass, and the contact surface between them [4]. The shear properties of the interface between the anchoring section and soil mass are important for the study on the pullout characteristics of grouted soil anchors.…”

Section: Introductionmentioning

confidence: 99%

Analytical Calculation on the Load - Displacement Curve of Grouted Soil Anchors

Yang¹,

Chen²,

Zhang³

et al. 2018

JESTR

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The load-displacement curve of anchors can be used as a basis for quality tests, and it is also important in the stability analysis of the combined supporting structure of anchors. Most of the existing analytical methods can only solve the partial pullout process of grouted soil anchors and obtain local load-displacement curves. To obtain a complete loaddisplacement curve, mechanical differential equations for the anchoring section in each stage were derived in this study based on a softening shear model of the anchor-soil interface and a load transfer model of the anchoring section. Combined with boundary conditions, the displacement, axial force, and shear stress distributions along the anchoring section and the analytical solutions for the load-displacement curve in the entire pullout process of anchors were obtained. The accuracy of the proposed method was verified by a pullout test on a foundation pit in Chongqing, China. Results show that a complete load-displacement curve is obtained with the proposed analytical method and a theoretical curve is consistent with a field pullout curve. The shear stress on the anchoring section is irregularly and non-uniformly distributed with a single peak. The load-displacement curve is influenced by the changes in parameters, such as anchorage length, anchorage radius, elastic modulus of the anchoring section, and residual shear coefficient. The present study accurately simulates the entire pullout process of anchors, determines their ultimate bearing capacity, obtains a complete load-displacement curve, and provides a theoretical basis for the quality evaluation and modelling analysis on grouted soil anchors.

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