scholarly journals A Unified Model for Analyzing Comprehensive Behaviors of Deepwater Anchors

2021 ◽  
Vol 9 (8) ◽  
pp. 913
Author(s):  
Haixiao Liu ◽  
Yancheng Yang ◽  
Jinsong Peng
Keyword(s):  
Failure Mode ◽  
Soil Layer ◽  
Unified Model ◽  
Movement Direction ◽  
Layered Soils ◽  
Pullout Capacity ◽  
Kinematic Behavior ◽  
Mechanical Models ◽  
Plate Anchors ◽  
Ultimate Pullout Capacity

Anchors may exhibit various complicated behaviors in the seabed, especially for deepwater anchors including gravity installed anchors (GIAs) and drag embedment plate anchors (drag anchors), stimulating the development of an efficient analytical tool that applies to a variety of anchors. The present paper introduces a unified model for analyzing different anchor behaviors in both clay and sand, consisting of unified concepts, mechanical models, and analytical procedure. The kinematic behaviors of the anchors are classified uniformly as three types, i.e., diving, pulling out, and keying. By utilizing the least-force principle, various anchor properties, such as the ultimate pullout capacity (UPC), failure mode, movement direction, embedment loss, and kinematic trajectory, can all be determined by the combination and analysis of the three behaviors. Applications of the model are demonstrated summarily, by solving the UPC and the failure mode of anchor piles and suction anchors, the kinematic trajectory of drag anchors in a single soil layer or layered soils, the maximum embedment loss (MEL) of suction embedded plate anchors (SEPLAs) and OMNI-Max anchors, and the kinematic behavior of OMNI-Max anchors. Compared to existing theoretical methods, this unified model shows strong applicability and potentiality in solving a variety of behaviors and properties of different anchors under complicated seabed conditions.

scholarly journals Ultimate Pullout Capacity of a Square Plate Anchor in Clay with an Interbedded Stiff Layer

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Tugen Feng ◽  
Jingyao Zong ◽  
Wei Jiang ◽  
Jian Zhang ◽  
Jian Song
Keyword(s):  
Finite Element ◽  
Empirical Formula ◽  
Soil Layer ◽  
Embedment Depth ◽  
Layered Soils ◽  
Pullout Capacity ◽  
Plate Anchor ◽  
Square Plate ◽  
Plate Anchors ◽  
Ultimate Pullout Capacity

Three-dimensional nonlinear numerical analysis is carried out to determine the ultimate pullout capacity of a square plate anchor in layered clay using the large finite element analysis software ABAQUS. An empirical formula for the pullout bearing capacity coefficient of a plate anchor in layered soils is proposed based on the bearing characteristics of plate anchors in single-layer soils. The results show that a circular flow (circulation field) is induced around the plate anchor during the uplift process and that the flow velocity and circulation field range are mainly affected by the properties of the soil around the plate anchor. The bearing characteristics of plate anchors in layered soils are influenced by factors such as the embedment depth of the plate anchor, the friction coefficient between the soil and the plate anchor, the thickness of the upper soil layer, and the thickness of the middle soil layer. The rationality of the finite element numerical calculation results and the empirical formula is verified by comparing the results from this study with results previously reported in the literature.

Ultimate pullout capacity of single vertical plate anchors in sand

2021 ◽  
pp. 1-19
Author(s):  
Peizhi Zhuang ◽  
Hongya Yue ◽  
Xiuguang Song ◽  
Renjuan Sun ◽  
Jianqing Wu ◽  
...  
Keyword(s):  
Vertical Plate ◽  
Pullout Capacity ◽  
Plate Anchors ◽  
Ultimate Pullout Capacity

Evaluation of Ultimate Pullout Capacity of Anchor Cables Embedded in Rock Using a Unified Rupture Shape Model

2018 ◽  
Vol 37 (4) ◽  
pp. 2625-2637 ◽  
Author(s):  
Qian-qing Zhang ◽  
Ruo-feng Feng ◽  
Zhen-hao Xu ◽  
Shan-wei Liu ◽  
Jian-gu Qian
Keyword(s):  
Pullout Capacity ◽  
Shape Model ◽  
Ultimate Pullout Capacity

The ultimate pullout capacity of anchors in frictional soils

2006 ◽  
Vol 43 (8) ◽  
pp. 852-868 ◽  
Author(s):  
R S Merifield ◽  
S W Sloan
Keyword(s):  
Finite Element ◽  
Lower Bound ◽  
Limit Analysis ◽  
Numerical Study ◽  
Past Research ◽  
Pullout Capacity ◽  
Current Design ◽  
Pullout Load ◽  
Ultimate Pullout Capacity ◽  
Frictional Soils

During the last 30 years various researchers have proposed approximate techniques to estimate the uplift capacity of soil anchors. As the majority of past research has been experimentally based, much current design practice is based on empiricism. Somewhat surprisingly, very few numerical analyses have been performed to determine the ultimate pullout loads of anchors. This paper presents the results of a rigorous numerical study to estimate the ultimate pullout load for vertical and horizontal plate anchors in frictional soils. Rigorous bounds have been obtained using two numerical procedures that are based on finite element formulations of the upper and lower bound theorems of limit analysis. For comparison purposes, numerical estimates of the break-out factor have also been obtained using the more conventional displacement finite element method. Results are presented in the familiar form of break-out factors based on various soil strength profiles and geometries and are compared with existing numerical and empirical solutions.Key words: anchor, pullout capacity, finite elements, limit analysis, lower bound, sand.

scholarly journals Experimental study of pullout capacity of plate anchors shallowly embedded in hydrate bearing sediments

2019 ◽  
Vol 173 ◽  
pp. 548-555
Author(s):  
Fang Liu ◽  
Haoyu Sun ◽  
Jongwon Jung ◽  
Xuhui Zhang ◽  
Xin Ju
Keyword(s):  
Experimental Study ◽  
Pullout Capacity ◽  
Plate Anchors ◽  
Hydrate Bearing Sediments

scholarly journals Ultimate Pullout Capacity of Shallow Vertical Anchors in Clay

1985 ◽  
Vol 25 (2) ◽  
pp. 148-152 ◽  
Author(s):  
Braja M. Das ◽  
Roberto Moreno ◽  
Karim F. Dallo
Keyword(s):  
Pullout Capacity ◽  
Ultimate Pullout Capacity
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