Abstract
China's energy demand is growing rapidly and large hydropower plants are becoming more common. This therefore has resulted in the building of many large concrete dams across the country. Significant dam cracking can have major environmental, economic and social consequences. Collapse of High concrete dam may cause serious harm to economic development as well as safety of the people; thereby necessitating the need for research on safety and stability of high concrete dam under high water and seismic conditions. In this paper, the high concrete dam of Longtan was used as an example, using the ABAQUS program based on the extended finite element method to analyze the Longtan Dam under static and dynamic conditions which has been commonly used for the study of crack growth. A numerical prediction of crack propagation in concrete gravity dams is presented. The two-dimensional seismic numerical study was done using acceleration-time records from Koyna earthquake in 1976 Dam concrete cracking range and cracking were discussed during a seismic time. The locations that are easy to generate cracks are illustrated from the analysis and the findings showed that, during seismic activity the Longtan Dam was rather unsafe. The results of the work can provide a valuable guide for the design and operation of the dam system.
Highlights
The development of society in China is proliferating; as a result of this, the demand for energy is growing
We study the effects of cracking under pressure, gravity and the seismic response of a concrete dam, using a numerical model based on the Longtan Dam in China
Unlike these methods, which require cohesive surfaces to follow boundaries of elements and cracks to propagate along a set of predefined paths, the method of XFEM-based cohesive segments can be used to simulate crack propagation and initiation in bulk materials along an arbitrary, solution-dependent path, as crack propagation is not attached to the mesh component boundaries
Summary
The development of society in China is proliferating; as a result of this, the demand for energy is growing. Today in China, coal burning is the most common source of energy production, an area that continues to expand. It is worth noting that China is the largest hydropower producer in the world; there are plans to build 13 large hydropower plants, some of which are already under construction. Longtan Dam, a concrete dam of high density, is one of the dams in the country and has recently started producing electricity. Longtan Dam is the highest dense concrete dam in the world with a height of 216.5 meters and produces 6300 MW. Safety and sustainability issues should be of the utmost importance from design and construction to maintenance and operation. Many of China's dams are located in seismic high-risk areas, increasing the risk of dam destruction. Numerical analysis is suitable for problems with arbitrary geometry and
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