Deformation of Reservior Landslide during Reservoir Water Fluctuation

2011 ◽  
Vol 90-93 ◽  
pp. 1334-1340
Author(s):  
Wei Mao ◽  
E Chuan Yan ◽  
Kun Song ◽  
Ting Ting Zhang
Keyword(s):  
Numerical Simulation ◽  
Three Dimension ◽  
Front Part ◽  
Reservoir Water ◽  
Monitoring Point ◽  
Calculation Results ◽  
Young Module ◽  
Motion Characteristics ◽  
The Stability ◽  
Water Impoundment

On the base of the obtained materials and considering the factors of composition features, dynamic mechanism and deformation-motion characteristics, the three-dimension numerical simulation model is generated. And the parameters of Young module, passion ratio and shear strength are obtained. Then the calculation conditions are extracted from the combination of the inducible factors and the displacement features. After that, the deformation failure are simulated by the FLAC3D code, and the results are compared to the monitoring data. The results indicate that the influence of the water impoundment on the stability of the landslide is small, the water descending is large. For the front part monitoring points, the amounts and the curve shapes of the numerical calculation results are accord with the practical ones, but for the monitoring point in back there are only the similarities in the curve shapes, and the amounts are a little smaller.

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.

The Application of FLAC Software in Stability Analysis of Highway Slope Reinforced by Prestressed Anchor Cable

2012 ◽  
Vol 241-244 ◽  
pp. 2158-2162
Author(s):  
Hui Min Wang ◽  
Liang Cao ◽  
Ji Yao ◽  
Ze Li
Keyword(s):  
Numerical Simulation ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Stability Factor ◽  
Anchor Cable ◽  
Equilibrium Method ◽  
Before And After ◽  
Calculation Results ◽  
The Stability ◽  
Prestressed Anchor

rigid limit equilibrium method and numerical simulation of FLAC software based on strength reduction method was used in this paper, and the stability of a highway slope before and after the reinforcement by prestressed anchor cable was analyzed. The calculation results showed that, the stability of designed excavated slope could not meet the requirements, while the stability of reinforced sloped by prestressed anchor cable could. The sliding surface of the slope and the corresponding stability factor could be obtained in two ways, but the numerical simulation of FLAC software considered the material deformation, so the calculation results was smaller than the results of rigid limit equilibrium method.

Numerical Simulation and Design Optimization of Anchor Bolt-Sash Girder Support for Expansive Soil Cutting Slope

2015 ◽  
Vol 744-746 ◽  
pp. 547-550
Author(s):  
Hong Zhang ◽  
Guo Jun Sheng ◽  
Wen Qing Wu
Keyword(s):  
Numerical Simulation ◽  
Design Optimization ◽  
Expansive Soil ◽  
Original Design ◽  
Cutting Slope ◽  
Calculation Results ◽  
Soil Cutting ◽  
Anchor Bolts ◽  
The Stability ◽  
Vertical Spacing

The reinforcement of expansive soil cutting slope has been a difficulty for the construction industry. This study selected Wanyi Expressway as the construction background and used finite difference method for the numerical simulation and design optimization of expansive soil cutting slope reinforced by sash girder anchor bolts. Calculation results show that the cutting slope ratio is closely related to the stability of the expansive soil cutting slope and that the length, set angle, and vertical spacing of the anchor bolts significantly influence the deformation of the cutting slope. The original design plan was optimized according to the calculation results, and a positive effect in plan execution was achieved. This study may serve as a reference for other similar construction designs.

scholarly journals Numerical Modeling and Stability Analysis of Surrounding Rock of Yuanjue Cave

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Zhigang Meng ◽  
Fangzheng Fan ◽  
Xuebin Cui ◽  
Shu Tao ◽  
Yi Cao
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Lower Layer ◽  
Three Dimensional ◽  
Surrounding Rock ◽  
The Body ◽  
Adjacent Area ◽  
The West ◽  
Monitoring Point ◽  
The Stability

Yuanjue Cave, located in Big Buddha Bay, Mount Baoding, Dazu Rock Carvings Area, has extremely high historical, artistic, and religious value and is an important grotto cultural relic in China. Due to the cutting action of the fissures and weak interlayers, the South Cliff of Big Buddha Bay where Yuanjue Cave is located showed signs of instability. In order to fully evaluate the stability of the rock mass around the cliff where Yuanjue Cave is located, a three-dimensional geological model of the surrounding rock of Yuanjue Cave was established by using FLAC3D software, combined with three-dimensional scanning, fissure investigation, and indoor tests. The stability of the surrounding rock mass adjacent to Yuanjue Cave has been studied by precise numerical simulation, and the results of numerical simulation and monitoring have been compared and analysed. The results show the following: (1) The west of J10 fissure, above the mudstone interlayer, is the main deformation area. The cliff displacement increases gradually from the east to the west. The independent block above the corner has the largest free space displacement, and there is a risk of independent collapse. Special attention should be paid to the stability of this block. The displacement of the upper monitoring point of the cliff wall is significantly greater than that of the lower layer. (2) In the surrounding rock block in the adjacent area, the various concentrated stresses of the body are mainly located at the entrance of Yuanjue Cave, the height of the chest of the Zhengjue Buddha statue, and the lower mudstone erosion and reinforcement zone. Among them, the stress concentration in the erosion and reinforcement area under the Zhengjue Buddha statue is the largest. The conclusions obtained can provide a useful reference for the stability assessment of the surrounding rock of Yuanjue Cave.

scholarly journals Analysis of the Stability and Hopf Bifurcation of Currency Supply Delay in an Opened Kaldorian Business Cycle Model

2016 ◽  
Vol 2016 ◽  
pp. 1-12
Author(s):  
Liming Zhao ◽  
Zhipei Zhao
Keyword(s):  
Numerical Simulation ◽  
Hopf Bifurcation ◽  
Business Cycle ◽  
Three Dimension ◽  
Cycle Model ◽  
Macroeconomic Policies ◽  
Existence Of Equilibrium ◽  
Business Cycle Model ◽  
The Stability ◽  
Theoretical Results

First of all, we establish a three-dimension open Kaldorian business cycle model under the condition of the fixed exchange rate. Secondly, with regard to the model, we discuss the existence of equilibrium point and the stability of the system near it with a time delay in currency supply as the bifurcating parameters of the system. Thirdly, we discuss the existence of Hopf bifurcation and investigate the stability of periodic solution generated by the Hopf bifurcation; then the direction of the Hopf bifurcation is given. Finally, a numerical simulation is given to confirm the theoretical results. This paper plays an important role in theoretical researching on the model of business cycle, and it is crucial for decision-maker to formulate the macroeconomic policies with the conclusions of this paper.

Slope Stability Analysis under the Condition of Seepage

2012 ◽  
Vol 204-208 ◽  
pp. 241-245
Author(s):  
Yang Jin
Keyword(s):  
Finite Element Method ◽  
Shear Strength ◽  
Slope Stability ◽  
Negative Impact ◽  
Strength Reduction ◽  
Soil Slope ◽  
Failure State ◽  
Calculation Results ◽  
The Stability ◽  
Shear Strength Reduction

The stability of soil slope under seepage is calculated and analyzed by using finite element method based on the technique of shear strength reduction. When the condition of seepage or not is considered respectively, the critical failure state of slopes and corresponding safety coefficients can be determined by the numerical analysis and calculation. Besides, through analyzing and comparing the calculation results, it shows that seepage has a negative impact on slope stability.

scholarly journals Numerical Simulation of Intrachamber Processes in the Power Plant

2021 ◽  
Vol 11 (11) ◽  
pp. 4990
Author(s):  
Boris Benderskiy ◽  
Peter Frankovský ◽  
Alena Chernova
Keyword(s):  
Numerical Simulation ◽  
Power Plant ◽  
Flow Structure ◽  
Power Plants ◽  
Control Volume ◽  
Conjugate Problem ◽  
Topological Features ◽  
Gas Dynamic ◽  
Calculation Results ◽  
Volume Method

This paper considers the issues of numerical modeling of nonstationary spatial gas dynamics in the pre-nozzle volume of the combustion chamber of a power plant with a cylindrical slot channel at the power plant of the mass supply surface. The numerical simulation for spatial objects is based on the solution conjugate problem of heat exchange by the control volume method in the open integrated platform for numerical simulation of continuum mechanics problems (openFoam). The calculation results for gas-dynamic and thermal processes in the power plant with a four-nozzle cover are presented. The analysis of gas-dynamic parameters and thermal flows near the nozzle cover, depending on the canal geometry, is given. The topological features of the flow structure and thermophysical parameters near the nozzle cap were studied. For the first time, the transformation of topological features of the flow structure in the pre-nozzle volume at changes in the mass channel’s geometry is revealed, described, and analyzed. The dependence of the Nusselt number in the central point of stagnation on the time of the power plants operation is revealed.

Numerical Simulation of Filling and Solidification in Sand Casting by Procast

2013 ◽  
Vol 791-793 ◽  
pp. 550-553 ◽  
Author(s):  
Dong Dong Han ◽  
Cheng Jun Wang ◽  
Juan Chang ◽  
Lei Chen ◽  
Huai Bei Xie
Keyword(s):  
Numerical Simulation ◽  
Heat Dissipation ◽  
Solidification Process ◽  
Simulation Software ◽  
Sand Casting ◽  
Production Costs ◽  
Raw Material ◽  
Casting Defects ◽  
Three Dimension ◽  
Filling And Solidification

At present, pulley produced in China has been able to meet the demand of domestic and international markets. But there are many problem of the pulley industry in our country, such as too many production enterprises and the low level of export products. And as components of drive system are light weight and raw material price of pulley casting are rising, manufacturing requirements of the pulley are also more and more high. Aiming at the casting defects of pulley that enterprise current product, pulley casting blank model of common material HT250 be made by three-dimension software, numerical simulation of filling and solidification process for pulley sand casting by the casting simulation software Procast, the size and location of the various casting defects were forecasted and analyzed, reflecting the pulley filling and solidification process of the actual situation, due to the thicker pulley rim and less heat dissipation, position of shrinkage is close to the middle of rim [, a method of eliminating defects is proposed to realize sequential solidification, and thus to minimize porosity shrinkage and improve casting performance and reduce casting time and reduce production costs.

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