Numerical Analysis of Geo-Grid to Enhence Stability of Tailings Dam

2013 ◽  
Vol 868 ◽  
pp. 287-290
Author(s):  
Yong Li Zhang ◽  
Yao Zhang ◽  
Yu Lin Ma ◽  
Chang Su ◽  
Xiang Feng Liu
Keyword(s):  
Working Conditions ◽  
Ultimate Load ◽  
Failure Surface ◽  
Fracture Plane ◽  
Structure Stability ◽  
Tailings Dam ◽  
Tailing Dam ◽  
Tailing Dams ◽  
Dam Stability ◽  
The Stability

The stability of tailing dams has recently become a hot issue on the engineering, and geo-synthetics curing processing applications are widely used. The influence of the tailings dam stability of geo-textile grid by calculating and analyzing with numerical simulation is studied. It reveals the mechanical behavior and the inherent law of the dam under different physical properties and different conditions of geo-grid. The force of reinforcement and the change law of ultimate load under different working conditions are systematically simulated by FLAC, and then analyze the formation process of sensitivity and fracture plane that influenced the ultimate load. The result shows: The failure surface is not such concentrated after joining the geo-textile grid and the safety factor increases 60%. The stability of the dam structure of tailing dam is effectively improved. Research has provided the basis for the structure stability of tailings dam's designing.

scholarly journals Theoretical and Case Studies of Interval Nonprobabilistic Reliability for Tailing Dam Stability

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Longjun Dong ◽  
Daoyuan Sun ◽  
Xibing Li
Keyword(s):  
Mechanical Parameters ◽  
Analysis Model ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Proposed Model ◽  
Tailing Dam ◽  
Calculation Results ◽  
Tailing Dams ◽  
Dam Stability ◽  
The Stability

The stability of the operation of a tailing dam is affected by reservoir water level, phreatic line, and mechanical parameters of tailings. The values of these factors are not a definite value in different situations. Meanwhile, the existence of the phreatic line makes it a more complex issue to analyze the stability of the tailing dam. Additionally, it is very hard to give a definite limit to the state of tailing dam from security to failure. To consider the uncertainty when calculating the stability of the tailing dams, interval values are used to indicate the physical and mechanical parameters of tailings. An interval nonprobabilistic reliability model of the tailing dam, which can be used when the data is scarce, is developed to evaluate the stability of the tailing dam. The interval nonprobabilistic reliability analysis model of tailing dam is established in two cases, including with and without considering phreatic line conditions. The proposed model was applied to analyze the stability of two tailing dams in China and the calculation results of the interval nonprobabilistic reliability are found to be in agreement with actual situations. Thus, the interval nonprobabilistic reliability is a beneficial complement to the traditional analysis method of random reliability.

Stability Analysis of Tailing Dam under the Action of Seepage

2014 ◽  
Vol 556-562 ◽  
pp. 812-816
Author(s):  
Hui Ying Zhang ◽  
Ai Min Gong ◽  
Hai Yan Huang
Keyword(s):  
Working Conditions ◽  
Limit Equilibrium ◽  
Element Model ◽  
Seepage Flow ◽  
Tailings Dam ◽  
Stability Evaluation ◽  
Seepage Force ◽  
Stability Against Sliding ◽  
Tailing Dam ◽  
The Stability

A finite element model of tailings dam model was used to simulate the steady seepage field and analysis the stability under different working conditions. The head contour, velocity, seepage flow and seepage gradient was analyzed. The stability against sliding in this tailings dam was analyzed with the help of the simplified Bishop method which is based on rigid body limit equilibrium coupled with seepage force. The security coefficient under different working conditions was calculated. The analysis result shows that the safety factor meets the specification requirements, and which provides reference for the stability evaluation of tailings dam.

Study of Fuzzy Random Reliability Model of Tailings Dam under Earthquake Action

2010 ◽  
Vol 44-47 ◽  
pp. 3393-3397
Author(s):  
Fei Yue Wang ◽  
Long Jun Dong ◽  
Zhi Sheng Xu
Keyword(s):  
Zero Point ◽  
Reliability Theory ◽  
Dam Failure ◽  
Tailings Dam ◽  
Tailing Dam ◽  
Calculation Results ◽  
Earthquake Action ◽  
The Stability ◽  
Fuzzy Random

Two kinds of the deficiencies exist in the traditional dam reliability and the safety coefficient calculation methods. First, it is impossible to give accurate mean to design variable in case study, because to large extent, means are greatly influenced by many objective factors or man-made effects, which degree of effects has greater degree of ambiguity. Second, the traditional reliability theory takes zero point as measure of dam’s failure or not, and on both sides of zero point the structure of state mutants from security to failure. But in fact, it’s very hard to give a definite limitation to the dam state from security to failure, because a fuzzy scope exists between stability and failure. On the basis of solving the above two issues, this paper for the first time applies fuzzy reliability theory to the stability research of tailings dam under earthquake action , considering fuzziness of both the event of tailings dam failure and the main variables and parameter. Integrating fuzziness and randomness, this paper explores fuzzy random reliability analysis methods of tailings dam engineering. The results of case study show that the calculation results agree well with the actual situation, this analysis method is more scientific and reasonable than traditional dam safety factor calculation method, and better reflects the real situation. It also provides a new way to calculate stability of tailing dam considering earthquake action.

Study on Reliability Analysis of Tailings Dam Stability

2007 ◽  
Vol 353-358 ◽  
pp. 2619-2622
Author(s):  
Chao Zhang ◽  
Chun He Yang ◽  
Feng Chen
Keyword(s):  
Probability Distribution ◽  
Reliability Analysis ◽  
Limit Equilibrium ◽  
Reliability Theory ◽  
Sensitivity Analyses ◽  
Tailings Dam ◽  
Tailings Dams ◽  
Dam Stability ◽  
The Stability ◽  
Distribution Type

Since the construction method of tailings dams determines the uneven distribution of tailings, a reliability theory is introduced to analyze the stability of tailings dams. Based on the limit equilibrium method and reliability theory, the sensitivity and reliability of a typical tailings dam are analyzed. Reliability analyses with different types of the variable probability distribution types show that the effect of the probability distribution type on reliability analysis can almost be ignored. Besides, the sensitivity analyses of different variables show that the strength indexes and density of tailings will affect the analysis results of stability reliability. Therefore the strength indexes c, φ and density ρ must be considered as basic variables to analyze the stability reliability of tailings dams.

Numerical Analysis of the Impact of the Stope Blasting Vibration on Tailings Dam Stability Based on GeoStudio

2014 ◽  
Vol 501-504 ◽  
pp. 200-206
Author(s):  
Qing Nan Wei ◽  
Shu Ran Lv
Keyword(s):  
Vibration Monitoring ◽  
Vibration Velocity ◽  
Blasting Vibration ◽  
Tailings Dam ◽  
Vibration Acceleration ◽  
Tailings Dams ◽  
Stability Against Sliding ◽  
Dam Stability ◽  
The Stability ◽  
The Impact

In this paper, based on the establishment of the finite element calculating model, the influence of the blasting vibration to tailings dams stability was analyzed in accordance with actual stope blasting vibration monitoring data. The laws of the blasting vibrations impact on tailings dam stability was reached by importing different vibration amplitude of vibration wave intensity. When the blasting vibration acceleration remained under 0.333g and vibration velocity remained under 17.005cm/s, the coefficient of the healthy tailings dam stability against sliding has a increasing trend with the increase of vibration strength. When the vibration acceleration and the vibration velocity reached the maximum value, the coefficient rapidly decline; But the influence of stope blasting vibration on the stability of the risky tailings dams is more significant. The coefficient of stability against sliding had a straight-line decrease to the risky tailings dams. In Engineering, more than 4 times margin is considered to find the control vibration velocity. The value is 4.25 cm/s. An analysis shows that the effect of blasting vibration on healthy tailings dam stability has two sides. When the blasting vibration intensity remains within control vibration velocity, it can be beneficial to the stability of tailings dam. Otherwise it will be harmful.

Numerical Simulation Analysis of Tailings Dam Heightening Expansion Stability

2014 ◽  
Vol 670-671 ◽  
pp. 1079-1082
Author(s):  
He Bing
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Operating Mode ◽  
Tailings Dam ◽  
Regulatory Requirements ◽  
Stability Coefficient ◽  
Standard Value ◽  
Dam Stability ◽  
The Stability ◽  
Maximum Limit

Xinchang tailings dam is used as an object and the software named Slide is utilized to operate numerical simulation, and then the three conditions (normal operating mode, flood conditions, the special conditions) of tailings dam are analyzed to determine the stability. The conclusions are as follows: tailings dam have been built to 80m height, both to meet regulatory requirements, so the dam is stable; but if continue to increase the height to 85m, tailings dam stability coefficient reduced to special conditions 1.032, less than the standard value 1.05, does not meet the national regulatory requirements, the maximum limit of a height of about 80m.

Comprehensive Evaluation Model-Based Fuzzy Math of Tailings Dam Stability

2010 ◽  
Vol 44-47 ◽  
pp. 3408-3412
Author(s):  
Fei Yue Wang ◽  
Zhi Sheng Xu ◽  
Long Jun Dong
Keyword(s):  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Safety Evaluation ◽  
Evaluation Index System ◽  
Tailings Dam ◽  
Layer System ◽  
Tailing Dam ◽  
Fuzzy Math ◽  
Dam Stability ◽  
Set Up

Aiming at the high occurrence of accident at broken tailing dam and its significance in safety, the defects of evaluation methods currently used were pointed out. Considering that the safety system was a multiple-factor and multiple-layer system, a new evaluation based on fuzzy math was presented. A more rational comprehensive evaluation index system is proposed. The weight of each factor was also obtained, and corresponding safety evaluation model was set up by fuzzy math. The model is applied to lead-zinc tailings dam of QingshuiTang in Hengyang City of China. Results show that this method is practicable and reasonable. It provides a new method to evaluate stability of tailing dam.

Influencing Factors and Control Measures of the Saturation Line of Tailing Dams

2013 ◽  
Vol 790 ◽  
pp. 165-168
Author(s):  
Zhi Fe Song ◽  
Qun Wang
Keyword(s):  
Influencing Factors ◽  
Saturation Line ◽  
Control Measures ◽  
Future Research ◽  
Line Position ◽  
Tailing Dam ◽  
Tailing Dams ◽  
The Stability ◽  
And Control ◽  
Great Harm

Given that the current security situation of tailing reservoir is not optimistic in China, and the loss of stability of tailing dam has caused great harm to people's life and property, the article emphasizes the importance of saturation line position to the stability of tailing dam, and analyses several key influencing factors of the saturation line position, at the same time, some measures of controlling the rising of saturation line are put forward to improve the security and stability of tailing dams. In the end, it concludes with a discussion of future research consideration.

scholarly journals The Stability of Tailings Dams under Dry-Wet Cycles: A Case Study in Luonan, China

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 1048 ◽  
Author(s):  
Xingang Wang ◽  
Hongbin Zhan ◽  
Jiading Wang ◽  
Ping Li
Keyword(s):  
Chemical Properties ◽  
Tailings Dam ◽  
Maximum Displacement ◽  
Finite Element Program ◽  
Direct Shear Tests ◽  
Tailings Dams ◽  
Tailings Sand ◽  
Element Program ◽  
Dam Stability ◽  
The Stability

Instability of tailings dams may result in loss of life and property and serious environmental pollution. The position of the tailings dam’s phreatic line varies due to continuously changing factors such as rainfall infiltration and discharge of tailings recycling water. Consequently, tailings dams undergo dry-wet (DW) cycles, accompanied by the appearance of a hydro-fluctuation belt. With dynamic development of the physical and chemical properties of tailings sand in the hydro-fluctuation belt, the stability of tailings dams is uncertain. In this study, direct shear tests were performed on the tailings sand collected from a tailings dam in Luonan, through which the shear strength parameters of tailings sand with DW cycles were obtained. Then, a method that efficiently calculates the phreatic line of the tailings dam under DW cycles was proposed. In addition, based on laboratory tests and the proposed phreatic line calculation method, we used a finite element program to evaluate the stability of the tailings dam that experienced different DW cycles. The calculated results showed that: (i) the damage effects of DW cycles gradually weakens as the number of DW cycles increases. (ii) With the increasing of DW cycles, the maximum displacement of the tailings dam increases from 0.5 mm to 22 mm, and the area of maximum displacement expanded mainly at the toe of the tailings dam and at the front edge of the hydro-fluctuation belt. (iii) The tailings dam safety factor decreases continuously with increasing DW cycles. This study may provide a novel method for analyzing the stability of tailings dams under different DW cycles as well as an important reference for improving tailings dam stability.

Structure, Stability and Water Adsorption on Ultra-Thin TiO2 Supported on TiN

2019 ◽  
Author(s):  
Jose Julio Gutierrez Moreno ◽  
Marco Fronzi ◽  
Pierre Lovera ◽  
alan O'Riordan ◽  
Mike J Ford ◽  
...  
Keyword(s):  
Density Functional ◽  
Water Adsorption ◽  
Chemical Potential ◽  
Energy Gap ◽  
Molecular Water ◽  
Structure Stability ◽  
Ambient Conditions ◽  
Rutile Structure ◽  
The Stability ◽  
The One

<p></p><p>Interfacial metal-oxide systems with ultrathin oxide layers are of high interest for their use in catalysis. In this study, we present a density functional theory (DFT) investigation of the structure of ultrathin rutile layers (one and two TiO<sub>2</sub> layers) supported on TiN and the stability of water on these interfacial structures. The rutile layers are stabilized on the TiN surface through the formation of interfacial Ti–O bonds. Charge transfer from the TiN substrate leads to the formation of reduced Ti<sup>3+</sup> cations in TiO<sub>2.</sub> The structure of the one-layer oxide slab is strongly distorted at the interface, while the thicker TiO<sub>2</sub> layer preserves the rutile structure. The energy cost for the formation of a single O vacancy in the one-layer oxide slab is only 0.5 eV with respect to the ideal interface. For the two-layer oxide slab, the introduction of several vacancies in an already non-stoichiometric system becomes progressively more favourable, which indicates the stability of the highly non-stoichiometric interfaces. Isolated water molecules dissociate when adsorbed at the TiO<sub>2</sub> layers. At higher coverages the preference is for molecular water adsorption. Our ab initio thermodynamics calculations show the fully water covered stoichiometric models as the most stable structure at typical ambient conditions. Interfacial models with multiple vacancies are most stable at low (reducing) oxygen chemical potential values. A water monolayer adsorbs dissociatively on the highly distorted 2-layer TiO<sub>1.75</sub>-TiN interface, where the Ti<sup>3+</sup> states lying above the top of the valence band contribute to a significant reduction of the energy gap compared to the stoichiometric TiO<sub>2</sub>-TiN model. Our results provide a guide for the design of novel interfacial systems containing ultrathin TiO<sub>2</sub> with potential application as photocatalytic water splitting devices.</p><p></p>

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