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.

scholarly journals Data Mining of the Thermal Performance of Cool-Pipes in Massive Concrete via In Situ Monitoring

2014 ◽  
Vol 2014 ◽  
pp. 1-15 ◽  
Author(s):  
Zheng Zuo ◽  
Yu Hu ◽  
Qingbin Li ◽  
Liyuan Zhang
Keyword(s):  
Data Mining ◽  
Flow Rate ◽  
Thermal Performance ◽  
Monitoring Program ◽  
Heat Removal ◽  
Arch Dam ◽  
In Situ Monitoring ◽  
High Arch Dam ◽  
Massive Concrete

Embedded cool-pipes are very important for massive concrete because their cooling effect can effectively avoid thermal cracks. In this study, a data mining approach to analyzing the thermal performance of cool-pipes via in situ monitoring is proposed. Delicate monitoring program is applied in a high arch dam project that provides a good and mass data source. The factors and relations related to the thermal performance of cool-pipes are obtained in a built theory thermal model. The supporting vector machine (SVM) technology is applied to mine the data. The thermal performances of iron pipes and high-density polyethylene (HDPE) pipes are compared. The data mining result shows that iron pipe has a better heat removal performance when flow rate is lower than 50 L/min. It has revealed that a turning flow rate exists for iron pipe which is 80 L/min. The prediction and classification results obtained from the data mining model agree well with the monitored data, which illustrates the validness of the approach.

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.

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.

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.

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.

scholarly journals Research on concrete temperature control measures in deep hole area of super high arch dam

2021 ◽  
Vol 826 (1) ◽  
pp. 012035
Author(s):  
Yuchen Fu ◽  
Yaosheng Tan ◽  
Chunfeng Liu ◽  
Lei Pei ◽  
Yajun Wang ◽  
...  
Keyword(s):  
Temperature Control ◽  
Arch Dam ◽  
Control Measures ◽  
Deep Hole ◽  
High Arch Dam ◽  
Hole Area ◽  
Concrete Temperature

scholarly journals Analysis of the influence of asymmetric geological conditions on stability of high arch dam

2021 ◽  
Vol 28 (1) ◽  
pp. 426-436
Author(s):  
Zelin Ding ◽  
Xuanyi Zhu ◽  
Hongyang Zhang ◽  
Hanlin Ban ◽  
Yuan Chen
Keyword(s):  
Safety Factor ◽  
Negative Impact ◽  
Decisive Role ◽  
Arch Dam ◽  
Test Method ◽  
Stable Operation ◽  
High Arch Dam ◽  
Reinforcement Scheme ◽  
Structural Plane ◽  
Geological Conditions

Abstract Geological conditions play a decisive role in the stability of arch dam engineering, and the asymmetric geological conditions of the abutment have a very negative impact on the safety of the arch dam. This article takes Lizhou arch dam as the research object, and determines that the arch dam is preliminarily affected by the geological asymmetric characteristics. Through the geomechanical model test method, the overload failure test of the Lizhou arch dam was carried out, and the resistance body, the instability deformation of the structural plane of the two dam abutments, and the influence of each structural plane on the dam body are obtained, and the safety factor is determined. According to the test results under the condition of asymmetric foundation of arch dam, for the structural plane which affects the geological asymmetry of the arch dam, the corresponding reinforcement measures are carried out. The feasibility of the reinforcement scheme is verified by the finite element method, and the safety factor after reinforcement is obtained. According to the results, it is suggested that some engineering measures can be taken to reduce the geological asymmetry between the two banks and ensure the safe and stable operation of the arch dam in the future.

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