Research on High Arch Dam Failure Probability Based on Failure Mode

2007 ◽  
Vol 348-349 ◽  
pp. 597-600 ◽  
Author(s):  
Zai Tie Chen ◽  
Qing Wen Ren
Keyword(s):  
Failure Mode ◽  
Failure Probability ◽  
Failure Modes ◽  
Safety Evaluation ◽  
Economic Loss ◽  
Arch Dam ◽  
Computational Method ◽  
Dam Failure ◽  
Dam Safety ◽  
High Arch Dam

In order to overcome the weakness in traditional high arch dam safety evaluation without considering the randomness, failure mode and risk analysis, it is proposed to apply three indexes namely failure probability, economic loss and life loss to high arch dam safety evaluation. On the basis of the analysis of accidents and on-site measured data, expert discussion as well as analytical analogy and by means of Fault Tree Analysis, a probe is made into the four major failure modes and the causes of high arch dam failure, namely destabilization collapse, shear-slipping collapse, excess cracking and man-caused destruction. Based on the calculating of the probability of high arch dam shearing-slipping failure, the computational method and procedures are established by means of Second Moment Method for the calculation of the occurrence probability of the major failure modes of high arch dam. A study is made of the degree of correlation between the major failure modes and of the method for calculating the high arch dam failure probability under multi-failure-modes.

Reasonable Strength Criterion Research of High Arch Dam Based on Brittle Failure Constitutive Relation

2014 ◽  
Vol 578-579 ◽  
pp. 964-967
Author(s):  
Zhi Qiang Wang ◽  
Wen Biao Liu
Keyword(s):  
Constitutive Relation ◽  
Brittle Failure ◽  
Concrete Strength ◽  
Safety Evaluation ◽  
Strength Criterion ◽  
Arch Dam ◽  
Dam Failure ◽  
Dam Safety ◽  
High Arch Dam ◽  
Triaxial Strength

The brittle failure finite element method is widely used in arch dam safety evaluation, but it also has some problems, the concrete strength criterion is different, the dam failure range is different. This article first introduces brittle failure constitutive relation and three strength criterions, then takes a high arch dam as an example to compute, obtains some conclusions that the relative failure range of foundation plane corresponds to blaxial strength criterion is slightly bigger than the result of uniaxial strength criterion, is almost the same as the result of triaxial strength criterion. Because the influence of the third principal stress is compressed stress to the dam crack is taken into account under multiaxial strength criterion, therefore using multiaxial strength criterion is more reasonable.

Risk-Based Research on Failure Mode of High-Arch Concrete Dam

2008 ◽  
Vol 385-387 ◽  
pp. 269-272 ◽  
Author(s):  
Zai Tie Chen
Keyword(s):  
Failure Mode ◽  
Failure Modes ◽  
Safety Evaluation ◽  
Arch Dam ◽  
State Function ◽  
High Arch Dam ◽  
Arch Dams ◽  
Disaster Loss ◽  
Explosion Load ◽  
High Arch Dams

Risk analysis can overcome the weakness of conventional safety evaluation of high-arch dams where the random nature of the load and resistance effect are ignored and the failure mode and failure disaster loss are not taken into account. On the basis of statistical analysis of the data of the failure arch dams and faulty and perilous arch dams in the world, it is deduced that the failure of high arch dam is mainly caused by super elevation floods, highly intense earthquakes, mountain landslides, abnormal temperature variation, explosion load, etc. Five major failure modes for high arch dams are suggested, namely dam abutment rock instability, fundamental plane instability, entire entity instability, excess cracking and extreme dam overflow. Based on the study of the failure mechanism of the major failure modes, a state function is established to calculate the failure probability of the major failure modes. An approach is developed to obtain the statistical quantity and the regularities of distribution of the load and resistance random variables.

Study of Risk Evaluation System of High Arch Dam Based on Failure Mechanism

2009 ◽  
Vol 417-418 ◽  
pp. 541-544
Author(s):  
Zai Tie Chen
Keyword(s):  
Risk Evaluation ◽  
Evaluation System ◽  
Failure Modes ◽  
Quantitative Estimation ◽  
Arch Dam ◽  
Dam Failure ◽  
High Arch Dam ◽  
Arch Dams ◽  
Risk Evaluation System ◽  
High Arch Dams

In view of the randomness in terms of high arch dam load, resistance and failure calamity loss as well as the fuzziness in terms of evaluation conclusion, a high arch dam risk evaluation system is established by means of risk analysis method. Natural factors, structural factors and human factors that lead to high arch dam failure are summed up on the basis of statistics. Through qualitative analysis coupled with quantitative estimation, it is determined that high arch dams generally involve five major failure modes: abutment rock mass destabilization, excess cracking, arch dam & dam foundation entire destabilization, extreme dam-overflow and destabilization of dam body along base plane. The state functions of individual major failure modes are established. An approach is made to the correlativity among the major failure modes and among the random variables within individual failure modes, and it is suggested that risk rate, economic loss risk value and life loss risk value should be used to assess the risk of high arch dams. A certain high arch dam abutment instability risk evaluation has been provided.

Study on Estimating Failure Probability of Earth-Rock Dams

2012 ◽  
Vol 594-597 ◽  
pp. 1957-1960
Author(s):  
Rui Rui Sun ◽  
Xiao Ling Wang ◽  
Xue Fei Ao ◽  
Wei Ping Guo
Keyword(s):  
Risk Analysis ◽  
South China ◽  
Failure Probability ◽  
Failure Modes ◽  
Safety Management ◽  
Risk Identification ◽  
Dam Failure ◽  
Dam Safety ◽  
Risk Quantification ◽  
The Earth

Dam safety based on risk analysis methodologies demands risk quantification of the earth-rock dam project, and estimation on the failure probability of earth-rock dams is a major concern in the dam safety management. Due to numerous uncertainties, structures of the reservoir are involved leading to risks that may finally cause dam failure. The risk identification was firstly investigated according to the actual project. Subsequently, method of expertise was presented to estimate odds of the presence of each link in dam failure modes quantitatively. The reservoir composed of several dams in South China was taken as a case. The failure probabilities of each dam were obtained and results showed that risk of No.5 dam was relatively higher in all the dams. The research is of great significance to the dam safety management.

Seismic fragility analysis of a High Arch Dam-Foundation System based on seismic instability failure mode

2020 ◽  
Vol 130 ◽  
pp. 105981 ◽  
Author(s):  
Hui Liang ◽  
Jin Tu ◽  
Shengshan Guo ◽  
Jianxin Liao ◽  
Deyu Li ◽  
...  
Keyword(s):  
Failure Mode ◽  
Arch Dam ◽  
Fragility Analysis ◽  
Seismic Fragility ◽  
High Arch Dam ◽  
Dam Foundation

scholarly journals Cracking Behavior of a Concrete Arch Dam with Weak Upper Abutment

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Lei Xu ◽  
Shuaizhao Jing ◽  
Jie Liu ◽  
Yefei Huang
Keyword(s):  
Mechanical Properties ◽  
Sensitivity Analysis ◽  
Failure Mode ◽  
Arch Dam ◽  
Dam Failure ◽  
Crack Model ◽  
Cracking Behavior ◽  
Concrete Arch Dam ◽  
Smeared Crack ◽  
Smeared Crack Model

The cracking behavior and failure mode of a 78 m high concrete double-curvature arch dam with weak upper abutment are investigated through performing cracking analysis. The mechanical behavior of concrete is simulated using a smeared crack model, in which a combination of the compression yield surface and the crack detection surface with a damaged elasticity concept is employed to describe the failure of concrete. The arch dam with practical mechanical properties of the upper and lower abutments is firstly studied with emphasis on its cracking behavior during overloading. Then, a comprehensive sensitivity analysis is carried out to investigate the influence of the ratio of the mechanical properties of upper abutment to those of lower abutment on dam failure with prime attention placed on the failure mode. Simulation results indicate the adopted smeared crack model is well-suited to the crack analysis of concrete arch dam. It is shown that cracking is localized around the interface between upper and lower abutments, which leads to a fast crack growth in the through-thickness direction of dam and finally causes the dam failure. Furthermore, the sensitivity analysis presents three types of failure modes corresponding to different ratio value, wherein Modes II and III should be avoided since the weak upper abutment plays a predominant role in the cracking and failure of concrete arch dam.

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.

scholarly journals System Reliability Design Analysis of Propulsion Structures

1993 ◽  
Author(s):  
S. Mahadevan ◽  
S. Mehta ◽  
R. G. Tryon ◽  
T. A. Cruse
Keyword(s):  
Failure Probability ◽  
Rational Design ◽  
Failure Modes ◽  
Quantitative Information ◽  
Reliability Estimation ◽  
Computational Method ◽  
System Failure ◽  
Turbine Engine ◽  
Reliability Design ◽  
The Individual

The reliability of a gas turbine engine structure is affected by the uncertainties in the operating environment (speed, temperature etc.) as well as in the structural properties (material properties, geometries, boundary conditions etc.). A computational method for accurate reliability estimation under such uncertainties is described in this paper. Reliability computation for individual failure modes (burst, LCF etc.) as well as overall system failure is addressed. System failure probability is computed through the union of individual mode failures. The method also provides precise sensitivity information about the effect of each uncertain parameter on the individual failure probabilities as well as on the system failure probability. Such quantitative information helps rational design decisions as well as risk assessment and certification.

Sign in / Sign up

Export Citation Format

Share Document