scholarly journals Dynamic response of Zelazny Most tailings dam to mining induced extreme seismic event occurred in 2016

2019 ◽  
Vol 262 ◽  
pp. 01001
Author(s):  
Aleksandra Korzec ◽  
Waldemar Świdziński
Keyword(s):  
Stability Analysis ◽  
Dynamic Response ◽  
Dynamic Loading ◽  
Time Integration ◽  
Horizontal Displacement ◽  
Material Model ◽  
Implicit Time ◽  
Tailings Dam ◽  
Peak Horizontal Acceleration ◽  
The Stability

The paper deals with the stability analysis of tailings dam subjected to dynamic loading induced by mining shocks which occurred in neighbouring copper mine. The main goal of the paper was to model the dynamic response of the dam during two extreme paraseismic events which occurred in 2016 based on accelerograms recorded at the dam toe. Dynamic response of the tailings dam was calculated using finite element method and the implicit time-integration method implemented in commercial codes. The boundary condition corresponding to dynamic loading was determined by deconvolution procedure. The error analysis showed that most precise signal reproduction is achieved while using target signal with peak value reduced by 40% as a test signal. Both acceleration and displacement time-series were successfully reproduced. Moreover, the stability analysis was conducted for five independent signals with design peak horizontal acceleration and showed that no permanent displacements should occur. The temporary horizontal displacement of the dam crest should not exceed 13 mm, assuming equivalent linear material model.

Seepage-Stability Analysis of a Mine Tailings Dam in Yunnan Province Based on ANSYS

2012 ◽  
Vol 226-228 ◽  
pp. 1406-1410
Author(s):  
Shu Qi Ma ◽  
Si Jing Cai ◽  
Miao Guo
Keyword(s):  
Stability Analysis ◽  
Mine Tailings ◽  
Yunnan Province ◽  
Reduction Method ◽  
Field Analysis ◽  
Dam Safety ◽  
Tailings Dam ◽  
Ansys Software ◽  
Safety Coefficient ◽  
The Stability

As a major hazard installation in mine the safe and effective running of a tailings dam is very important, therefore the stability analysis of tailings dam is necessary. In order to evaluate the effect of seepage on stability of mine tailings dam, in this paper, a numerical model of a tailings dam in Yunnan province was established by using ANSYS software. It was focused on the dam seepage field analysis and the seepage-stability analysis, and on using the strength reduction method to derive the safety coefficient of the tailings dam. The results were proved reasonable and could be used to provide helpful guidance of dam safety.

Comparison of Implicit Time Integration Schemes for Nonlinear Dynamic Problems

2010 ◽  
Author(s):  
Murat Demiral
Keyword(s):  
Dynamic Equilibrium ◽  
Time Integration ◽  
Nonlinear Problems ◽  
Implicit Time ◽  
Implicit Methods ◽  
Equilibrium Equations ◽  
Integration Schemes ◽  
Implicit Time Integration ◽  
Time Integration Schemes ◽  
The Stability

Implicit time integration schemes are used to obtain stable and accurate transient solutions of nonlinear problems. Methods that are unconditionally stable in linear analysis are sometimes observed to have convergence problems as in the case of solutions obtained with a trapezoidal method. On the other hand, a composite time integration method employing a trapezoidal rule and a three-point backward rule sequentially in two half steps can be used to obtain accurate results and enhance the stability of the system by means of a numerical damping introduced in the formulation. To have a better understanding of the differences in the numerical implementation of the algorithms of these two methods, a mathematical analysis of dynamic equilibrium equations is performed. Several practical problems are studied to compare the implicit methods.

On the Stability and CPU Time of the Implicit Runge-Kutta Schemes for Steady State Simulations

2016 ◽  
Vol 20 (2) ◽  
pp. 486-511
Author(s):  
Yongle Du ◽  
John A. Ekaterinaris
Keyword(s):  
Steady State ◽  
Large Time ◽  
Time Integration ◽  
Implicit Time ◽  
Integration Scheme ◽  
Cpu Time ◽  
Implicit Time Integration ◽  
Runge Kutta ◽  
Dispersion And Dissipation Errors ◽  
The Stability

AbstractImplicit time integration schemes are popular because their relaxed stability constraints can result in better computational efficiency. For time-accurate unsteady simulations, it has been well recognized that the inherent dispersion and dissipation errors of implicit Runge-Kutta schemes will reduce the computational accuracy for large time steps. Yet for steady state simulations using the time-dependent governing equations, these errors are often overlooked because the intermediate solutions are of less interest. Based on the model equationdy/dt=(μ+iλ)yof scalar convection diffusion systems, this study examines the stability limits, dispersion and dissipation errors of four diagonally implicit Runge-Kutta-type schemes on the complex (μ+iλ)Δtplane. Through numerical experiments, it is shown that, as the time steps increase, the A-stable implicit schemes may not always have reduced CPU time and the computations may not always remain stable, due to the inherent dispersion and dissipation errors of the implicit Runge-Kutta schemes. The dissipation errors may decelerate the convergence rate, and the dispersion errors may cause large oscillations of the numerical solutions. These errors, especially those of high wavenumber components, grow at large time steps. They lead to difficulty in the convergence of the numerical computations, and result in increasing CPU time or even unstable computations as the time step increases. It is concluded that an optimal implicit time integration scheme for steady state simulations should have high dissipation and low dispersion.

Analysis of Steel Phase Transformations Using a Multiscale Transient Model

2015 ◽  
Vol 651-653 ◽  
pp. 545-551
Author(s):  
B. Barroqueiro ◽  
João Dias-de-Oliveira ◽  
António Andrade-Campos
Keyword(s):  
Phase Transformations ◽  
Time Integration ◽  
Material Model ◽  
Implicit Time ◽  
Homogeneous Material ◽  
Transient Model ◽  
Transient Problem ◽  
Commercial Program ◽  
Homogeneous Models ◽  
Transient Thermal

Multiphase steels offer impressive mechanical properties. However, their characterization still represents a challenge. In a quenching processes, phenomena such as undesirable strains or residual stress are inevitable and can be the cause for non-admissible final parts. Microstructural phase transformations generally magnify the problem. This fact leads to the need of numerical tools capable of quantifying these residual stresses, due to the non-existence of efficient non-destructive experimental procedure capable of measuring them. In this work, a numerical multiscale transient model, that uses the Asymptotic Expansion Homogenisation (AEH) method combined with finite element method (FEM), is proposed. The implementation of the AEH method is carried out using the commercial program Abaqus, considering an uncoupled and quasi-static transient problem with implicit time integration. Within the homogenisation method, the existence of two distinct scales is assumed, defining a micro and a macroscale. Within the smaller scale, the evolution of a steel periodic microstructure is analysed in detail and an equivalent homogeneous material model is established for macroscopic use. However, the microstructural evolution leads to the need of new equivalent homogeneous models in order to predict the macro response. Consequently, several mechanical, thermomechanical and transient thermal homogenization procedures are carried in order to establish different equivalent homogeneous models.

The Stability Analysis of Tailings Dam under the Fluid-Solid Coupled Interaction

2012 ◽  
Vol 204-208 ◽  
pp. 3078-3081
Author(s):  
Kun Yang ◽  
Hao Han ◽  
Zhi Chao Ma
Keyword(s):  
Stability Analysis ◽  
Coupled Model ◽  
Simulation Method ◽  
Practical Significance ◽  
Coupled Analysis ◽  
Tailings Dam ◽  
Sliding Surface ◽  
Seepage Field ◽  
Coupling Analysis ◽  
The Stability

Numerical simulation method is adopted to analysis the stability of tailings dam under the fluid-solid coupled interaction. Using the full-coupled analysis function, stress field 、seepage field and their coupled model are studied in this paper. Finally, the critical sliding surface of the tailings dam is searched. Results show that the safety factor after coupling is smaller than before. It illustrates that the fluid-solid coupling analysis has an important practical significance for the stability analysis of tailings dam.

Advanced Dynamic Stability Analysis

2009 ◽  
Author(s):  
Hammam O. Zeitoun ◽  
Knut To̸rnes ◽  
John Li ◽  
Simon Wong ◽  
Ralph Brevet ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Dynamic Response ◽  
Dynamic Stability ◽  
Structural Response ◽  
Force Balance ◽  
Finite Elements Analysis ◽  
Interaction Modelling ◽  
Advanced Analysis ◽  
The Stability ◽  
Subsea Pipelines

Several design approaches can be used to analyse the stability of subsea pipelines [1]. These design approaches vary in complexity and range between simple force-balance calculations to more comprehensive dynamic finite element simulations. The latter may be used to more accurately simulate the dynamic response of subsea pipelines exposed to waves and steady current kinematics, and can be applied to optimise pipeline stabilisation requirements. This paper describes the use of state-of-the-art transient dynamic finite elements analysis techniques to analyse pipeline dynamic response. The described techniques cover the various aspects of dynamic stability analysis, including: • Generation of hydrodynamic forces on subsea pipelines resulting from surface waves or internal waves. • Modelling of pipe-soil interaction. • Modelling of pipeline structural response. The paper discusses the advantages of using dynamic stability analysis for assessing the pipeline response, presents advanced analysis and modelling capabilities which have been applied and compares this to previously published knowledge. Further potential FE applications are also described which extends the applicability of the described model to analyse the pipeline response to a combined buckling and stability problem or to assess the dynamic response of a pipeline on a rough seabed.

A Mixed and Multi-Step Higher-Order Implicit Time Integration Family

2010 ◽  
Vol 224 (10) ◽  
pp. 2097-2108 ◽  
Author(s):  
M Rezaiee-Pajand ◽  
S R Sarafrazi
Keyword(s):  
Time Integration ◽  
Higher Order ◽  
Trapezoidal Rule ◽  
Implicit Time ◽  
Benchmark Problems ◽  
Integration Schemes ◽  
Implicit Time Integration ◽  
Time Integration Schemes ◽  
The Stability ◽  
Stability And Accuracy

This article develops a new time integration family for second-order dynamic equations. A combination of the trapezoidal rule and higher-order Newton backward extrapolation functions are utilized in the formulation. Five members of the suggested family are extensively studied in this article. Most members of the presented time integration family are new. The stability and accuracy of the proposed time integration schemes are investigated by solving some benchmark problems. Numerical results are checked and compared with well-known strategies. The findings of the article show the efficiency, accuracy and robustness of the suggested techniques.

Stability Analysis of a Free-Standing Block With Friction on a Moving Foundation

2001 ◽  
Author(s):  
Anna Sinopoli ◽  
Alessio Ageno
Keyword(s):  
Stability Analysis ◽  
Dynamic Response ◽  
Degrees Of Freedom ◽  
A Priori ◽  
Unilateral Constraints ◽  
Free Standing ◽  
Time Intervals ◽  
Analysis And Evaluation ◽  
The Stability ◽  
Scientific Purpose

Abstract The problem analyzed here concerns the dynamic response of a bidimensional polygonal rigid body simply supported on a harmonically moving rigid ground. The immediate scientific purpose of the paper is to obtain and analyze the dynamic response by using a variational formulation, recently proposed by one of the authors [1], where the dynamics is described as a differential inclusion. This formulation allows us to determine the instantaneous accelerations of the system by means of a mechanical model with friction and unilateral constraints, which does not reduce the degrees of freedom or impose an “a priori” choice of the mechanism activated during the motion. By treating the friction coefficient as a stability parameter, it has been possible to obtain different kind of responses, ranging from rocking to sliding-rocking, and compare them with those obtained in the literature. Sliding-rocking motions obtained so far have exhibited not only harmonic but also interesting and more complex behaviors with chaotic features. The search for theoretical and numerical instruments able to identify and classify these more complex motions was first performed in the case of rocking, characterized by a smaller number of degrees of freedom. A technique was then implemented for calculating Lyapunov’s exponents also during the time intervals of the impacts. The introduction and evaluation of these exponents can also permit us to perform the stability analysis with respect to overturning, by limiting the analysis and evaluation to the first impact that the system undergoes by starting at rest: in fact, large values of Lyapunov’s exponents before the first impact are connected with overturning during the motion which follows. This circumstance can make it easier to carry out the stability analysis with respect to overturning, as a function of the amplitude and frequency of the excitation.

Dynamic Response Analysis of Soil Slope under Strong Earthquake

2014 ◽  
Vol 919-921 ◽  
pp. 921-924
Author(s):  
Shuai Huang ◽  
Hong Ye Yan ◽  
De Gou Cai ◽  
Bo Song
Keyword(s):  
Dynamic Response ◽  
Strong Earthquake ◽  
Near Field ◽  
Horizontal Displacement ◽  
Element Model ◽  
Response Analysis ◽  
Soil Slope ◽  
Increasing Trend ◽  
The Stability ◽  
The Finite Element Model

Based on the finite element model of slope, the stability and dynamic response of sand slope are studied. The results show that with the increase of groundwater, the maximum horizontal displacement of slope shows increasing trend, and reach maximum horizontal displacement on the top of the slope, and the displacement under near-field earthquake is greater than that under far-field earthquake. The accelerations with groundwater are less than that without groundwater, which shows that the existence of groundwater damps vibration. Without considering the groundwater, the destruction of slope is mainly the circular shearing damage through the slope toe, while the destruction is not yet through the slope toe, but from a point on the front of slope.

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