scholarly journals Uncertainty Instability Risk Analysis of High Concrete Arch Dam Abutments

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Xin Cao ◽  
Chongshi Gu ◽  
Erfeng Zhao
Keyword(s):  
Influencing Factors ◽  
Risk Ratio ◽  
Failure Criterion ◽  
Limit Equilibrium ◽  
Failure Process ◽  
Arch Dam ◽  
Credibility Theory ◽  
High Arch Dam ◽  
Element Analysis ◽  
Fuzzy Random

The uncertainties associated with concrete arch dams rise with the increased height of dams. Given the uncertainties associated with influencing factors, the stability of high arch dam abutments as a fuzzy random event was studied. In addition, given the randomness and fuzziness of calculation parameters as well as the failure criterion, hazard point and hazard surface uncertainty instability risk ratio models were proposed for high arch dam abutments on the basis of credibility theory. The uncertainty instability failure criterion was derived through the analysis of the progressive instability failure process on the basis of Shannon’s entropy theory. The uncertainties associated with influencing factors were quantized by probability or possibility distribution assignments. Gaussian random theory was used to generate random realizations for influence factors with spatial variability. The uncertainty stability analysis method was proposed by combining the finite element analysis and the limit equilibrium method. The instability risk ratio was calculated using the Monte Carlo simulation method and fuzzy random postprocessing. Results corroborate that the modeling approach is sound and that the calculation method is feasible.

Application of Limit Equilibrium Method to Stability Analysis of Jinping I High Arch Dam Abutment on 3d Multi-Grid Method

2013 ◽  
Vol 405-408 ◽  
pp. 499-506
Author(s):  
Jing Wei Li ◽  
Chen Chen ◽  
Wei Wei
Keyword(s):  
Safety Factor ◽  
Limit Equilibrium ◽  
Temperature Drop ◽  
Three Dimensional ◽  
Grid Method ◽  
Arch Dam ◽  
High Arch Dam ◽  
Element Analysis ◽  
The Right ◽  
Reinforcement Measures

Based on nonlinear finite element analysis, three-dimensional elastoplastic numerical simulation of Jinping I high arch dam is developed. By using the method of multiply mesh, the stress result of FEM is transferred to any sliding surface (flat or curved), and the safety factors of sliding blocks are computed. The elastic-plastic calculation results indicate that the stress and displacement distributions are basically symmetrical to the river valley. The minimal safety factor of the left abutment under the basic condition is 4.88(larger than 3.5), which appears in the 1740m elevation in the temperature drop condition. However, the minimal safety factor of the right abutment under the basic condition is 3.41(less than 3.5), appearing in the 1710m elevation in the temperature rise condition, which means the necessity of the reinforcement measures to the right abutment.

Certain Question Research on Nonlinear Finite Element Analysis of High Arch Dam

2014 ◽  
Vol 610 ◽  
pp. 3-6
Author(s):  
Zhi Qiang Wang ◽  
Ke Hong Zheng
Keyword(s):  
Finite Element ◽  
Constitutive Relations ◽  
Safety Evaluation ◽  
Mesh Size ◽  
Nonlinear Finite Element ◽  
Arch Dam ◽  
High Arch Dam ◽  
Element Analysis ◽  
Work Condition ◽  
Strength Criteria

The nonlinear finite element can precisely simulate practical work condition of arch dam, but also has some problems in the safety evaluation of high arch dam, mainly in different mesh size, different strength criteria and constitutive relations of dam corresponding to different results. This article first proposes determining method for reasonable mesh size describes three strength criterions of uniaxial, biaxial, triaxial, gives two constitutive relations of dam cracking, damage. Take a high arch dam as an example, has done some research on the above question, obtain some beneficial conclusions.

Experimental Study on Seismic Failure of High Arch Dam with Scale Model Test on Shaking Table

2013 ◽  
Vol 353-356 ◽  
pp. 2004-2007
Author(s):  
Peng Fei Gao ◽  
Xin Feng ◽  
Jing Zhou
Keyword(s):  
Shaking Table Test ◽  
Failure Process ◽  
Arch Dam ◽  
Shaking Table ◽  
Scale Model ◽  
Experimental Investigations ◽  
Shaking Table Tests ◽  
High Arch Dam ◽  
Structural Concrete ◽  
Concrete Material

This paper presents the experimental investigations into the seismic failure for high arch dam with shaking table test. The similitude scale of high arch dam was studied firstly. Then we developed a like concrete material to simulate the mechanical behavior of the structural concrete in high arch dam. The shaking table tests have been performed on the scale model. The experimental results reveal the failure process of high arch dam with respect to the different earthquake intensities.

scholarly journals Overall Stability Analysis of Xiluodu High Arch Dam Based on Fine Three-Dimension Numerical Modeling

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Tianhui Ma ◽  
Zhiqiang Feng ◽  
Chun'an Tang ◽  
Peng Lin ◽  
Kedar Prasad Yadav
Keyword(s):  
Shear Fracture ◽  
Normal Load ◽  
Failure Process ◽  
Structure Design ◽  
Arch Dam ◽  
Tensile Failure ◽  
Design Stage ◽  
Load Factor ◽  
High Arch Dam ◽  
Overall Stability

The RFPA3D is used to establish a fine finite element model of 6.63 million elements, which realizes the fine simulation of the stability of the Xiluodu arch dam under layered, overall, multiworking conditions and multistress fields, and the cracking and failure process under overload. The structural design scheme of the arch dam and the corresponding foundation treatment design are evaluated. The model fully reflects the measures of dam shape structure design, angle fitting structure design, and foundation concrete replacement in the Xiluodu arch dam technical design stage. The RFPA3D adopts the mesoelement elastic damage model, which considers the Mohr–Coulomb criterion of shear fracture and the maximum tensile failure criterion, and assumes that the mechanical properties of the element satisfy Weibull distribution to consider its heterogeneity. The simulation results show that, under normal load conditions, the dam foundation surface after comprehensive reinforcement has better overall stability, the stress and deformation of the dam body have good symmetry, and the overload factor of crack initiation under overload calculation K1 = 2P0 (P0 is normal water load), the nonlinear deformation overload factor K2 = 3.5–4P0, and the limit load factor K3 = 7.5–8.0P0, dam safety can be satisfied. The RFPA3D is used to establish a superlarge fine model to study the overall stability of the high arch dam, which provides an effective method for analysis and research of other large hydraulic projects in the world.

Influence Factors of High dam Reservoir Basin Deformation Based on Finite Element Analysis and Weights Analysis

2014 ◽  
Vol 919-921 ◽  
pp. 1354-1360 ◽  
Author(s):  
Hao Gu ◽  
Xiao Fei Huang ◽  
Jing Ding
Keyword(s):  
Finite Element ◽  
Influence Factors ◽  
Arch Dam ◽  
Impact Factors ◽  
Dam Reservoir ◽  
High Arch Dam ◽  
Analytic Hierarchy ◽  
Element Analysis ◽  
River Reservoir ◽  
Reservoir Basin

This paper describes the principle and analysis method of reservoir basin finite element calculation. Taking the forked river as an example, this paper illustrates the factors of high arch dam reservoir basin deformation and weight analysis methods through the finite element modeling calculation and analysis of the influence of high arch dam reservoir basin deformation and calculates the weights of impact factors of forked river reservoir basin deformation using the analytic hierarchy process method and then compare in order to gain the conclusion.

scholarly journals Boolean-Based Surface Procedure for the External Heat Transfer Analysis of Dams during Construction

2013 ◽  
Vol 2013 ◽  
pp. 1-17 ◽  
Author(s):  
Yu Hu ◽  
Zheng Zuo ◽  
Qingbin Li ◽  
Yunling Duan
Keyword(s):  
Heat Transfer ◽  
External Heat ◽  
Arch Dam ◽  
Heat Transfer Analysis ◽  
High Arch Dam ◽  
Element Analysis ◽  
External Heat Transfer ◽  
Water Side ◽  
Insulation Effect ◽  
Set Up

The external heat transfer of dams during construction is complex because such transfer is location specific and time varying. An external thermal model is developed in this paper. Five types of external heat flux are considered in the mathematical model: air-side convection, electromagnetic radiation, absorbed solar input, water-side convection, and surface insulation effect. A method for extracting and classifying the external surfaces of dams on the basis of Boolean operations is proposed. Heat transfer conditions can be automatically set up for each step according to the proposed method, and the method can be used as a preprocessing facility for finite element analysis. A 285 m high arch dam in Southwest China is examined as a study case. The model is implemented and found to correctly identify different types of external surfaces. Simulation result agrees well with the monitored temperatures.

A monitoring-mining-modeling system and its application to the temperature status of the Xiluodu arch dam

2016 ◽  
Vol 20 (2) ◽  
pp. 235-244 ◽  
Author(s):  
Yu Hu ◽  
Guohe Liang ◽  
Qingbin Li ◽  
Zheng Zuo
Keyword(s):  
Data Mining ◽  
Numerical Modeling ◽  
Thermal State ◽  
Arch Dam ◽  
In Situ Monitoring ◽  
External Boundary ◽  
High Arch Dam ◽  
Element Analysis ◽  
First Case ◽  
Cooling Pipes

Knowledge of the concrete temperature of a dam is necessary for the implementation of improved construction methodologies. A monitoring-mining-modeling system is proposed in this article to study the thermal state of a super high arch dam in China. The monitoring-mining-modeling system includes an in situ monitoring network setup, data mining methods, and numerical finite element analysis. Two engineering cases are surveyed in detail using monitoring-mining-modeling system. The first case is the long-term temperature rise phenomenon, whose cause is determined from the data mining result, and the numerical modeling of the external boundary condition is improved using the result. The modeling result then shows that the effect of the TRP is also a dangerous factor for the deformation and stress state of the dam. The second case is the performance of cooling pipes. The energy absorption capability of the cooling pipes is revealed by the data mining result, as well as the performance difference between high-density polyethylene and iron pipes. The numerical modeling result shows good agreement with the monitored result, which demonstrates the closed-loop validity of the monitoring-mining-modeling system.

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