Numerical simulation analysis of damage mode of concrete gravity dam under close-in explosion

The basic theory of temperature field and stress field of concrete and 3D FEM combining with cooling pipe discrete model and iteration method are used to carry out the dynamic simulation analysis of the temperature filed and stress field of a concrete gravity dam of South-to-North Water Diversion Project. The impacts on cracking mechanism of the surface insulation, internal cooling and environmental climate are considered in calculation. The change laws of temperature field and thermal stress with time and their distributions are analyzed, reasonable temperature control measures are put forward for reference. The results show that good effect of temperature control and cracking prevention is achieved, the proposed measures should have great reference significance to the similar concrete dam in future.

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Effect of bubble pulse on concrete gravity dam subjected to underwater explosion: Centrifuge test and numerical simulation

Ocean Engineering ◽

10.1016/j.oceaneng.2021.110291 ◽

2022 ◽

Vol 243 ◽

pp. 110291

Author(s):

Xieping Huang ◽

Jing Hu ◽

Xuedong Zhang ◽

Zitao Zhang

Keyword(s):

Numerical Simulation ◽

Underwater Explosion ◽

Gravity Dam ◽

Centrifuge Test ◽

Concrete Gravity Dam

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The Parameter Inversion and Stress Simulation Analysis for High RCC Gravity Dam in Construction

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.182-183.1600 ◽

2012 ◽

Vol 182-183 ◽

pp. 1600-1604 ◽

Cited By ~ 1

Author(s):

Sheng Qiang ◽

Xiang Rong Wang ◽

Zhi Qiang Xie ◽

Zhan Qiang Zheng

Keyword(s):

Simulation Analysis ◽

Gravity Dam ◽

Measured Temperature ◽

Concrete Gravity Dam ◽

Construction Period ◽

Before And After ◽

Measured Strain ◽

Concrete Materials ◽

Stress Simulation ◽

The Ideal

Before and after pouring the concrete for a dam, how to predict and obtain the accurate temperature and stress of the various parts of the dam, is the key to prevent cracks in concrete. The stresses calculated from the parameters of the laboratory under the ideal conditions have obvious difference with the value calculated from site measured strain. As for such problem, based on the measured temperature and strain data of rolled compact concrete gravity dam engineering, the thermal and mechanics parameters of the concrete materials are inversed. The dam stress of construction period is simulated and analyzed separately based on the site parameters and lab parameters. The results show that although the stress development law from different ways is near, their values are different obviously because of three aspects. The site measured values should be more real. So it is necessary to inverse the thermal and mechanics parameters according to the site measured data.

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Study on Thermal Stress and Temperature Cracks Control of Longlin Roller Compacted Concrete Gravity Dam

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.212-213.912 ◽

2012 ◽

Vol 212-213 ◽

pp. 912-916 ◽

Cited By ~ 3

Author(s):

Wen Yi Zheng ◽

Peng Pan ◽

Lie Ping Ye

Keyword(s):

Temperature Control ◽

Simulation Analysis ◽

Control Function ◽

Heat Of Hydration ◽

Control Measures ◽

Gravity Dam ◽

Concrete Gravity Dam ◽

Progress Control ◽

Roller Compacted Concrete ◽

Rational Construction

In order to guide temperature control design and construction and to guarantee the construction quality of roller compacted concrete (RCC) gravity dams in severe cold area, it is of great significance to carry out the simulation analysis of temperature and stress. The whole progress of construction and operation of Longlin RCC gravity dam in harsh climate region were simulated by using the heat of hydration analysis control function, construction stag analysis control function and the time-dependent material link of MIDAS.civil.2006. According to the construction process, the curves of temperature and the curves of stress were obtained. The locations where the crack ratio may exceed 20 were also obtained and the correct temperature control measures and the rational construction progress control system were pointed out.

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3D Numerical Simulation of Majiabian Concrete Gravity Dam

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.90-93.2624 ◽

2011 ◽

Vol 90-93 ◽

pp. 2624-2632

Author(s):

Lin Ke Li ◽

Ai Jun Zhang ◽

Jin Yu Liu ◽

Chun Jiao Hou ◽

Hao Dong Li

Keyword(s):

Numerical Simulation ◽

Sensitivity Analysis ◽

Stability Analysis ◽

Water Level ◽

Deformation Modulus ◽

Gravity Dam ◽

Tension Stress ◽

Concrete Gravity Dam ◽

3D Numerical Simulation ◽

The Stability

A new method that 3D numerical simulation combined with anti-cut stability analysis is employed to analyze the stability of Majiabian gravity dam, and the results of the analysis conform to the measured value. And this method can be used in analysis of congener gravity dam. When the results of 2D sliding stability analysis satisfy Code’s requirements, elastic material can be used in 3D numerical simulation. The results of water level sensitivity analysis and deformation modulus of its foundation sensitivity analysis indicates that this gravity dam is insensitive to water level; grouting method can be adopted to enhance its foundation. The results of abutment under tension stress analysis indicate that tension stress of abutment must be considered in high gravity dam design, and arch can be used for reducing the tension stress.

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Characteristics of seismic motions at a concrete gravity dam site and suggestions for setting the engineering bedrock

Earthquake Spectra ◽

10.1177/87552930211014549 ◽

2021 ◽

pp. 875529302110145

Author(s):

Nario Yasuda ◽

Zengyan Cao

Keyword(s):

Numerical Simulation ◽

Ground Motion ◽

Seismic Performance ◽

Natural Vibration ◽

Gravity Dam ◽

Vibration Modes ◽

Concrete Gravity Dam ◽

Earthquake Records ◽

Deep Rock ◽

Dam Site

The earthquake records of a concrete gravity dam with eight seismographs were spectrally analyzed to clarify the characteristics of the seismic motions at each monitoring station. Based on the analysis results, whether it is appropriate to use such earthquake records to generate the input ground motion in assessments of the seismic performance of dams was discussed. It was found that the earthquake records at the dam base show reduced amplitudes at frequencies corresponding to the natural vibration modes of the dam. When these earthquake records are used to generate the input ground motion in an assessment of the seismic performance of a dam, sufficient consideration should be given to this feature. Suggestions on where to install seismographs at dam sites are presented. Based on the numerical simulation of the seismic response of the dam, it is suggested that the engineering bedrock should be considered to be located at a depth of at least 1.5 times the dam height, and the shear wave velocity of the rock at that depth should preferably be 2000 m/s or more. Since this study uses seismic motions recorded across the entire dam site, including the deep rock, which is globally rare, it is considered that the basic conclusions obtained in the article can provide a reference for other concrete dams.

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