Variation analysis of ultimate pullout capacity of shallow horizontal strip anchor plate with 2-layer overlying soil based on nonlinear M-C failure criterion

Zhao, Lianheng; Tan, Yigao; Nie, Zhihong; Yang, Xiaohan; Hu, Shihong

doi:10.1007/s11771-018-3954-x

Cited by 10 publications

(3 citation statements)

References 35 publications

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“…Before the discussion of pullout capacity of the anchor plate, it is necessary to ascertain the accuracy and validity of numerical model. For c = 0 kPa, the current numerical simulation results are compared with those results obtained by the method of limit analysis [31,34] and limit equilibrium [35] as shown in Figure 3(a). Although the current results are lower than that of the limit equilibrium solutions, the comparison demonstrates that the current results are similar to both limit analysis solutions, with a relative error of less than 5%.…”

Section: Model Comparisonmentioning

confidence: 99%

Upper Bound Finite Element Limit Analysis of Pullout Characteristics of Normal-Stressed Circular Anchor Plate

Luo

Wei²,

Huang

et al. 2022

Geofluids

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In this paper, the pullout factor and failure mode of circular anchor plate at an inclined angle with the horizontal ground under the normal stress are studied with the method of the upper bound finite element limit analysis. The effects of soil cohesion, internal friction angle, anchor plate inclination angle, and embedded ratio on the pullout factor are investigated to reveal the evolution of fracture surface of the soil around anchor plate under limit state. It is noted that the analysis of variance is adopted to process a series of data related to pullout capacity for obtaining the expression of the anchor plate’s pullout factor. The results show that the internal friction angle is the key factor determining the pullout characteristics of the anchor plate. Particularly, the effect of the inclination angle on pullout capacity is highly correlated to the internal friction angle. For φ = 0 ° , failure zone around anchor plate is presented as localization plastic zone and pullout capacity is linearly related to soil cohesion. The effect of inclination angle on pullout resistance is less significant. For φ ≠ 0 ° , the failure mode around the anchor plate is developing into full failure zone extending from both sides of anchor plate to ground. It is clearly noted that angle between the failure surface and horizontal line is greatly affected by the inclination of the anchor plate. Moreover, the effect of the inclination angle on pullout factor increases with increasing internal friction angle, which should be considered in the evaluation of the pullout bearing characteristics of the inclined circular anchor plate.

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Section: Model Comparisonmentioning

confidence: 99%

Upper Bound Finite Element Limit Analysis of Pullout Characteristics of Normal-Stressed Circular Anchor Plate

Luo

Wei²,

Huang

et al. 2022

Geofluids

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“…The anchor work is considered after the anchor has been entirely opened. The analytical method is thought to be the same as the enormous stellar plate anchor [23].…”

Section: Literature Reviewmentioning

confidence: 99%

Model Test of the Pull-up Capacity of Folding Type Ground Anchors in Cohesive Soil

et al. 2022

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The purpose of this research is to develop a folding anchor model, which is a modification of the star-shaped plate anchor, and to investigate the pull-up capability operating in cohesive soils. Physical testing is performed in the laboratory and on a full scale in the field, with the findings of the pull-up capacity achieved compared. The anchor model is made up of four leaves with varying widths and depths. It is flexible and may be closed and opened like an inverted umbrella. The effective area of each anchor was determined in laboratory experiments to be A1=30.00, A2=57.60, and A3=147.20 cm2, evaluated in a test column bath and filled with statically compressed, cohesive soil in four layers to a height of 30 cm. Each model was evaluated at three different depths: 30, 60, and 90 cm. The effective area of each anchor in field testing is B1=57.60, B2=147.20, and B3=600 cm2. The qualities of the soils chosen in the laboratory and in the field are identical. Each model was tested at three different depths: 100, 200, and 300 cm. The most resemblance to pull-up test results was found in laboratory and outdoor testing. The findings indicated that the area of each anchor model increased at each depth, resulting in a considerable rise in pull-up load. The change in depth of each anchor variation, however, did not result in a substantial increase in pull-up load. This implies that the folding type model anchors do not need extensive design. Each area change has a fundamental constraint in that adding depth will no longer result in a higher maximum pull-up capability. It also shows that these anchors are relatively simple to install in the field using basic tools without excavating or drilling the soil. Doi: 10.28991/CEJ-2022-08-09-07 Full Text: PDF

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“…The above studies enriched the uplift behavior researches, and most studies were based on frictional or clayey materials. However, the general soil has both internal friction angle and cohesion, and a large number of researches [30][31][32][33][34] have shown that geomaterials exhibit strong nonlinear characteristics which has a significant effect on the structural stability and bearing capacity. In the above studies, the soil inherent nonlinear characteristics were neglected, leading to a slight deviation in the anchor plate design.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional upper‐bound limit analysis of ultimate pullout capacity of anchor plates using variation method

Zhao

Tan

et al. 2022

Num Anal Meth Geomechanics

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The uplift bearing capacity of anchor plates has been the focus of geotechnical engineering research. In this study, based on the upper-bound limit analysis theory and considering the nonlinear characteristics of geomaterials, the three-dimensional uplift behavior of a shallow horizontal anchor plate was analyzed. Based on the variational principle, virtual power principle, and equilibrium equation, the ultimate pullout forces of rectangular and circular anchor plates were derived, and the dimensionless breakout factor and failure mechanism of the overlying soil were obtained. The ultimate pullout forces were in good agreement with the existing research results, and the principal stresses along the rupture surface agreed well with that obtained by numerical analysis, which could demonstrate the effectiveness and accuracy of the proposed method. Moreover, the effects of the nonlinear coefficient, anchor size and aspect, embedment ratio, and surface overload on the breakout factor were investigated. Meanwhile, the shape modification factors of rectangular and circular anchor plates were obtained. The findings of this study can provide a useful reference for anchor plate design.

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Variation analysis of ultimate pullout capacity of shallow horizontal strip anchor plate with 2-layer overlying soil based on nonlinear M-C failure criterion

Cited by 10 publications

References 35 publications

Upper Bound Finite Element Limit Analysis of Pullout Characteristics of Normal-Stressed Circular Anchor Plate

Upper Bound Finite Element Limit Analysis of Pullout Characteristics of Normal-Stressed Circular Anchor Plate

Model Test of the Pull-up Capacity of Folding Type Ground Anchors in Cohesive Soil

Three‐dimensional upper‐bound limit analysis of ultimate pullout capacity of anchor plates using variation method

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