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.

Effect of the impounding process on the overall stability of a high arch dam: a case study of the Xiluodu dam, China

2015 ◽  
Vol 8 (11) ◽  
pp. 9023-9041 ◽  
Author(s):  
Danni Luo ◽  
Peng Lin ◽  
Qingbin Li ◽  
Dong Zheng ◽  
Hongyuan Liu
Keyword(s):  
Arch Dam ◽  
High Arch Dam ◽  
Overall Stability

Failure and overall stability analysis on high arch dam based on DFPA code

2014 ◽  
Vol 45 ◽  
pp. 164-184 ◽  
Author(s):  
Peng Lin ◽  
Tianhui Ma ◽  
Zhengzhao Liang ◽  
Chun An Tang ◽  
Renkun Wang
Keyword(s):  
Stability Analysis ◽  
Arch Dam ◽  
High Arch Dam ◽  
Overall Stability

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.

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 Cracking Risk and Overall Stability Analysis of Xulong High Arch Dam: A Case Study

2018 ◽  
Vol 8 (12) ◽  
pp. 2555 ◽  
Author(s):  
Peng Lin ◽  
Pengcheng Wei ◽  
Weihao Wang ◽  
Hongfei Huang
Keyword(s):  
Three Dimensional ◽  
Arch Dam ◽  
High Arch Dam ◽  
Arch Dams ◽  
Nonlinear Constitutive Model ◽  
Cracking Control ◽  
Overall Stability ◽  
Three Dimensional Finite Element ◽  
Reinforcement Measures ◽  
Cracking Risk

It is of great significance to study the cracking risk, the overall stability, and the reinforcement measures of arch dams for ensuring long-term safety. In this study, the cracking types and factors of arch dams are summarized. By employing a nonlinear constitutive model relating to the yielding region, a fine three-dimensional finite element simulation of the Xulong arch dam is conducted. The results show that the dam cracking risk is localized around the outlets, the dam heel, and the left abutment. Five dam stress zones are proposed to analysis dam cracking state base of numerical results. It is recommended to use a shearing-resistance wall in the fault f57, replace the biotite enrichment zone with concrete and perform consolidation grouting or anchoring on the excavated exposed weak structural zone. Three safety factors of the Xulong arch dam are obtained, K_1 = 2~2.5; K_2 = 5; K_3 = 8.5, and the overall stability of the Xulong arch dam is guaranteed. This study demonstrates the significance of the cracking control of similar high arch dams.

scholarly journals Deformation Monitoring of Geomechanical Model Test and Its Application in Overall Stability Analysis of a High Arch Dam

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Baoquan Yang ◽  
Lin Zhang ◽  
Enlong Liu ◽  
Jianhua Dong ◽  
Honghu Zhu ◽  
...  
Keyword(s):  
Model Test ◽  
Deformation Monitoring ◽  
Arch Dam ◽  
Test Method ◽  
Geomechanical Model ◽  
High Arch Dam ◽  
Arch Dams ◽  
Overall Stability ◽  
The Stability ◽  
High Arch Dams

Geomechanical model testing is an important method for studying the overall stability of high arch dams. The main task of a geomechanical model test is deformation monitoring. Currently, many types of deformation instruments are used for deformation monitoring of dam models, which provide valuable information on the deformation characteristics of the prototype dams. However, further investigation is required for assessing the overall stability of high arch dams through analyzing deformation monitoring data. First, a relationship for assessing the stability of dams is established based on the comprehensive model test method. Second, a stability evaluation system is presented based on the deformation monitoring data, together with the relationships between the deformation and overloading coefficient. Finally, the comprehensive model test method is applied to study the overall stability of the Jinping-I high arch dam. A three-dimensional destructive test of the geomechanical model dam is conducted under reinforced foundation conditions. The deformation characteristics and failure mechanisms of the dam abutments and foundation were investigated. The test results indicate that the stability safety factors of the dam abutments and foundation range from 5.2 to 6.0. These research results provide an important scientific insight into the design, construction, and operation stages of this project.

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