Optimization and safety evaluation of concrete gravity dam section

2015 ◽  
Vol 19 (6) ◽  
pp. 1612-1619 ◽  
Author(s):  
Arnab Banerjee ◽  
D. K. Paul ◽  
Arijit Acharyya
Keyword(s):  
Safety Evaluation ◽  
Gravity Dam ◽  
Concrete Gravity Dam

Seismic Analyses of 3D Fengman Concrete Gravity Dam

2014 ◽  
Vol 1065-1069 ◽  
pp. 586-589
Author(s):  
Zhi Bin Wang ◽  
Feng Hai Ma ◽  
Zhi Yu Zhou
Keyword(s):  
Seismic Response ◽  
Safety Evaluation ◽  
Gravity Dam ◽  
Concrete Gravity Dam ◽  
3D Fem ◽  
Element Analysis ◽  
Earthquake Loads ◽  
Nonlinear Seismic Response ◽  
Safe Side ◽  
Earthquake Action

In this paper, the new Fengman gravity dam is numerically simulated to study the seismic response and safety evaluation by considering the different strength grade concrete partition, corridor, a discharge hole and gate pier. A complex 3D FEM of a real overflow monolith was built by taking advantage of AutoCADand ANSYS, nonlinear seismic response was studied under earthquake loads. Numerical simulations show that acceleration, displacement and stresses of dam were obtained in a complex 3D FEM under seismic precautionary intensity of 7 degree earthquake loads, results compared with the dam simple models were on the safe side. Fengman dam was still safe under seismic precautionary intensity of 8 degree earthquake loads, so the dam had enough capacity to resist earthquake action. At the same time, it is concluded that 3D dynamic FEM is very important for safety evaluation of concrete gravity dam subjected to the earthquake. The research provides finite element analysis reference works for comprehensive governance and reconstruction of Fengman Hydropower Station.

scholarly journals Probabilistic Seismic Analysis of the Deep Sliding Stability of a Concrete Gravity Dam-Foundation System

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Hui Liang ◽  
Shengshan Guo ◽  
Yifu Tian ◽  
Jin Tu ◽  
Deyu Li ◽  
...  
Keyword(s):  
Seismic Analysis ◽  
Safety Evaluation ◽  
Gravity Dam ◽  
Seismic Fragility ◽  
Concrete Gravity Dam ◽  
Dam Foundation ◽  
Seismic Safety ◽  
Sample Number ◽  
Seismic Safety Evaluation ◽  
Sliding Stability

There are various uncertainties in the design, construction, and operation of dams. These uncertainties have an important impact on the seismic response and seismic safety evaluation of concrete dams. In this research, a typical nonoverflow monolith of a concrete gravity dam is selected as a case study for the sliding stability analysis. Based on the analysis and demonstration of parameter sensitivity of friction coefficients and cohesion and their influence on the deep antisliding stability of the dam-foundation system, the probabilistic seismic analysis of a gravity dam-foundation system is carried out through Monte Carlo analysis with a large sample number. Damage levels are defined based on the sliding instability failure mode along with the corresponding threshold values of the damage index. Thus, seismic fragility analysis is investigated, and seismic fragility curves are obtained for the vulnerability assessment under earthquake hazards. The overall seismic stability of the gravity dam is evaluated, which provides the basis for the seismic safety evaluation in the probabilistic framework.

Assessment of the Applicability of Pushover Analysis for a Concrete Gravity Dam

2018 ◽  
Vol 9 (5) ◽  
pp. 181
Author(s):  
Machach Laila ◽  
Mouzzoun Mouloud ◽  
Moustachi Oum El Khaiat ◽  
Taleb Ali
Keyword(s):  
Pushover Analysis ◽  
Gravity Dam ◽  
Concrete Gravity Dam

Genetic Algorithm for Searching for Critical Slip Surface in Gravity Dams Based on Stress Fields

2013 ◽  
Vol 790 ◽  
pp. 146-149
Author(s):  
Jian Yun Chen ◽  
Shu Wang ◽  
Qiang Xu ◽  
Jing Li
Keyword(s):  
Genetic Algorithm ◽  
Slip Surface ◽  
Safety Evaluation ◽  
Fem Analysis ◽  
Stress Fields ◽  
Gravity Dam ◽  
Critical Slip Surface ◽  
Gravity Dams ◽  
Sliding Stability ◽  
Search Program

Currently, the safety evaluation of gravity dam concentrates on stress and anti-sliding stability of the dam. A lot of research shows that the upper area of the dam is one of the whole dams weakest areas during an earthquake and should be studied in details. In this study, the genetic algorithm and non-linear FEM analysis are combined, then a search program is written to search the critical slip surface in the dams upper area. Finally, the surface which has the least anti-sliding stability coefficient is obtained, the most dangerous slip surface and its anti-sliding coefficient as well as the corresponding time are acquired to evaluate the safety of the dam.

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