The static equilibrium of drag anchors in sand

1996 ◽  
Vol 33 (4) ◽  
pp. 574-583 ◽  
Author(s):  
S R Neubecker ◽  
M F Randolph
Keyword(s):  
Equilibrium Solution ◽  
Limit Equilibrium ◽  
Three Dimensional ◽  
Limit Equilibrium Method ◽  
Solution Procedure ◽  
Static Equilibrium ◽  
Static Limit ◽  
Centrifuge Model ◽  
Calcareous Sands ◽  
Good Agreement

This paper examines the static equilibrium of drag anchors during embedment in sand. A limit equilibrium method is developed to allow the anchor holding capacity to be predicted given a specific anchor geometry and position relative to the free surface of the sand. The method is based on the earlier approach of Le Lievre and Tabatabaee, but is extended to include a three-dimensional soil wedge, which is consistent with experimental observation. The solution procedure is also extended to be more applicable for anchors at a preultimate stage by incorporating a force behind the anchor fluke. To calibrate the method, a series of centrifuge model anchor tests has been performed in silica and calcareous sands. The static capacity of the anchor during embedment is compared with the static limit equilibrium solution and good agreement is demonstrated. Key words: drag anchor, statics, sand, limit equilibrium, ultimate holding capacity.

The kinematic behaviour of drag anchors in sand

1996 ◽  
Vol 33 (4) ◽  
pp. 584-594 ◽  
Author(s):  
S R Neubecker ◽  
M F Randolph
Keyword(s):  
Key Words ◽  
Limit Equilibrium ◽  
Predictive Tool ◽  
Kinematic Data ◽  
Theoretical Simulation ◽  
Centrifuge Model ◽  
Essential Step ◽  
General Rules ◽  
Kinematic Behaviour ◽  
Calcareous Sands

The kinematic behaviour of drag achors during embedment in sand is examined in this paper. A series of centrifuge model anchor tests has been performed in silica and calcareous sands in which both force and kinematic data were obtained during the course of anchor embedment. In this paper, the kinematic data have been examined to determine general rules for the kinematic behaviour of a drag anchor during embedment. These rules provide an essential step towards a theoretical simulation of a complete anchor embedment history and hence a predictive tool for the ultimate holding capacity of a drag anchor. Key words: drag anchor, kinematics, sand, limit equilibrium, ultimate holding capacity.

Three-dimensional limit equilibrium method based on a TIN sliding surface

2019 ◽  
Vol 262 ◽  
pp. 105325 ◽  
Author(s):  
Zhen-ping Liu ◽  
Jian Liu ◽  
Kang Bian ◽  
Fei Ai
Keyword(s):  
Limit Equilibrium ◽  
Three Dimensional ◽  
Limit Equilibrium Method ◽  
Sliding Surface ◽  
Equilibrium Method

Numerical Simulation and Monitoring Analysis for High-Fill Slope

2013 ◽  
Vol 639-640 ◽  
pp. 274-278
Author(s):  
Liang Liang Duan ◽  
Guo Jing He ◽  
Jin Yi ◽  
Yue Feng Li
Keyword(s):  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
In Situ Monitoring ◽  
Monitoring Data ◽  
Main Process ◽  
Dynamic Design ◽  
Reinforcement Design ◽  
Fill Slope ◽  
Good Agreement

It is necessary to simulate construction and operation and analyze monitoring data in time for dynamic construction and reinforcement design of high-fill slope. As a typical example, some high-fill slope is calculated with limit equilibrium method for evaluation of the slope stability. The slope is also calculated with finite element method (FEM) and monitored during construction and operation. FEM stress and displacement results are in good agreement with in-situ monitoring data. Combining FEM computation with monitoring analysis is the main process of dynamic design which guides construction and reinforcement and assures safety.

Study of the Three-Dimensional Global Limit Equilibrium Method Applied to the Stability of Rock Slope

2012 ◽  
Vol 249-250 ◽  
pp. 1099-1102
Author(s):  
Yi Sheng Huang ◽  
Jian Lin Li
Keyword(s):  
Rock Mass ◽  
Stability Analysis ◽  
Slip Surface ◽  
Limit Equilibrium ◽  
Limit State ◽  
Three Dimensional ◽  
Limit Equilibrium Method ◽  
Equilibrium Method ◽  
The Stability ◽  
Loose Rock

Amending the normal stress over the slip surface based on the stress field by numerical analysis, applying the three-dimensional global limit equilibrium method to the stability analysis of tension-slackened rock mass in the right bank of Yagen hydropower station. Stability analysis shows that if do not take any measures, the loose rock mass stability can cater to the Specification demand, but some small sliders is in the limit state under the water and earthquake condition, if use the cutting slope and unloading scheme, the whole loose rock mass and the all small sliders can meet the Specification standard stability requirements.

A novel displacement-based rigorous limit equilibrium method for three-dimensional landslide stability analysis

2015 ◽  
Vol 52 (12) ◽  
pp. 2055-2066 ◽  
Author(s):  
Hao Cheng ◽  
Xiaoping Zhou
Keyword(s):  
Stability Analysis ◽  
Limit Equilibrium ◽  
Three Dimensional ◽  
Vertical Displacement ◽  
Limit Equilibrium Method ◽  
Reduction Factor ◽  
Shear Stresses ◽  
Equilibrium Method ◽  
Displacement Based ◽  
The Relationship

Conventional stability analysis of landslides is investigated using the factor of safety of the entire sliding body, which provides no information concerning displacements of the analyzed landslides. In this paper, a novel displacement-based rigorous limit equilibrium method is proposed to investigate the displacements and stabilities of three-dimensional landslides. The relationship between the shear stresses acting on the base of the columns and the shear displacements is established based on the hyperbolic soil model, which can be directly obtained from direct shear tests. According to the displacement compatibility among the columns, the shear displacements of all columns can be determined by the vertical and horizontal displacements at a key point. Combining the six equilibrium conditions of the discretized columns with the nonlinear constitutive relation between stress and displacement of soils, the vertical displacement at the key point can be determined. By introducing the strength reduction technique into the displacement-based rigorous limit equilibrium method, the relationship between the reduction factor and the vertical displacement can be obtained. The displacement and the safety factor of three-dimensional landslides can be defined. Moreover, two cases are given to verify the robustness and precision of the present method in detail.

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