The Effect of Faults on the Behaviour of the Earth Dam – Case Study of the Ourkiss Dam

2021 ◽  
Author(s):  
Hassiba Beghzim ◽  
Toufik Karech ◽  
Tayeb Bouzid
Keyword(s):  
Shear Stress ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Water Level ◽  
Difference Method ◽  
Earth Dam ◽  
The Earth ◽  
Base Displacement ◽  
Vertical Base

Abstract The analysis of the failure due to the effect of the propagation of normal and reversed faults with different angles of inclination and by sliding through the Ourkiss dam isstudied numerically. Mainly at the end of construction and at the highest water level, for this purpose the non-linear finite difference method is used considering four fault angles of inclination, activated at the center of the base of the embankment.The results of the study show that the shear stress values increase with the increase of the vertical base displacement imposed in both conditions of the dam state, and this for both normal and overturned faults.

Calculation on the Internal Force of Deeply Buried Anti-Slide Pile by Using Finite Difference Method Based on the m-k Type Method

2011 ◽  
Vol 130-134 ◽  
pp. 128-134 ◽  
Author(s):  
Qiu Yan Fan ◽  
Mei Qian Wang ◽  
Sheng Cai Xu
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Solution Process ◽  
Step Length ◽  
Internal Force ◽  
Power Series Method ◽  
Type Method ◽  
New Type

In the past, when used the foundation coefficient to calculate the internal force of anti-slide pile, power series method is usually adopted. The deformation compatibility conditions and continuity conditions of sliding surface between non-anchoring section and anchoring section are exploited to determine the final result, causing the lengthy solution process and that there is no guarantee for the calculation accuracy. This paper uses the foundation coefficient method in the calculation of internal force of anti-slide pile and employs the “m-k” method with a more complicated up-down foundation structure to get the finite difference equation to determine the new-type deeply buried anti-slide pile displacement and internal force. Then the calculation on the internal force and displacement of the whole pile can be realized easily through the procedure method. Finally, this paper makes a contrastive analysis on the result of the finite difference method and finite element calculation through the case study. As long as the equal differential step length is small enough, the calculation accuracy can meet the demand of engineer design and the program graph processing result can optimize the design of anti-slide pile.

The Applications of Concrete Cut-Off Wall in the Reinforcement of the Earth Dam

2010 ◽  
Vol 150-151 ◽  
pp. 749-752
Author(s):  
Jing Long Li ◽  
Shu Cai Li ◽  
Shu Chen Li
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Earth Dam ◽  
Elastic Model ◽  
Cutoff Wall ◽  
The Earth ◽  
Before And After ◽  
Coulomb Model ◽  
Explicit Finite Difference ◽  
Explicit Finite Difference Method

The concrete cutoff wall is a technology used in reinforcing sick dams more usually in recent years. In the text, the advanced FLAC3D method which is based on 3-D explicit finite difference method, is used to simulate a reinforcement of earth dam using concrete cutoff wall. Through the simulation, Mohr-Coulomb model, elastic model and Goodman element are used to analyse the distribution of the stress and the strain of the dam before and after reinforcement. Consequently, we can evaluate the unti-seepaging effect and raise the possible question.

scholarly journals Determination of the efforts in two-way slabs of concrete through the finite difference method

2021 ◽  
Vol 18 (1) ◽  
pp. 25-32
Author(s):  
Carlos Valbson Dos Santos Araújo ◽  
João Paulo Matos Xavier ◽  
Robson Lopes Pereira
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Good Alternative ◽  
Concrete Plate ◽  
Classic Solution ◽  
The Finite Difference Method ◽  
Support Conditions

From the implementation of analytical solutions for thin rectangular slabs using the Finite Difference Method, the present paper was developed with the purpose of comparing the determined efforts in a concrete plate with those that would be found using the tables originated from the plates theory of authors established in the literature. For this, the programming language Python was used, taking as a case study, a slab with dimensions of 5 meters long by 3 meters wide and thickness equal to 0.10 meters. In the analysis of the efforts, several support conditions were considered, in which the internal efforts and displacements obtained by the Finite Difference Method were compared with the results obtained through the tables proposed in literature. It was verified that the Finite Difference Method constitutes a good alternative for the resolution of thin solid plates, since the results were similar to the classic solution proposed in literature. The implemented program allows the visualization of the efforts through of spectrums of zone which facilitates the understanding of the distribution of the efforts along the slab, differing slightly from the uniform distribution adopted in the tables consulted.

scholarly journals On accurate geoid modeling: derivation of dirichlet problems that govern geoidal undulations and geoid modeling by means of the finite difference method and a hybrid method

2014 ◽  
Vol 20 (2) ◽  
pp. 334-353
Author(s):  
Eduardo Del Rio
Keyword(s):  
Dirichlet Problem ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Hybrid Method ◽  
Difference Method ◽  
Gravity Data ◽  
Dirichlet Problems ◽  
Geoid Model ◽  
The Earth ◽  
Stokes's Integral

The geoid is the reference surface used to measure heights (orthometric). These are used to study any mass variability in the Earth system. As the Earth is represented by an oblate spheroid (Ellipsoid), the geoid is determined by geoidal undulations (N) which are the separation between these surfaces. N is determined from gravity data by Stokes's Integral. However, this approach takes a Spherical rather than an Ellipsoidal Earth. Here it is derived a Partial Differential Equation (PDE) that governs N over the Earth by means of a Dirichlet problem and show a method to solve it which precludes the need for a Spherical Earth. Moreover, Stokes's Integral solves a boundary value problem defined over the whole Earth. It was found that the Dirichlet problem derived here is defined only over the region where a geoid model is to be computed, which is advantageous for local geoid modeling. Moreover, the method eliminates several of the sources of uncertainty in Stokes's Integral. However, estimates indicate that the errors due to discretization are very large in this new method which calls for its modification. So, here it is also proposed an optimal combination of techniques by means of a Hybrid method and shown that it alleviates the uncertainty in Finite Difference Method. Moreover, a rigorous error analysis indicates that the Hybrid method proposed here may well outperform Stokes's Integral.

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