Impact Of Shear Parameters On The Stability Of RCC Dam

The current installed capacity of hydropower is just over200million kilowatts, more than500million kilowatts will be installed by2050. Due to large-scale water conservancy and hydropower dam construction, and there are three main types of dam to choose from:rock fill dam, normal concrete dam and roller compacted concrete dam. Roller compacted concrete dam (RCC) has a lot of advantages such as low construction cost; short construction time and environmental adaptability. However, compared with normal concrete dam, the construction process RCC dam generates many thin layers, which have unique mechanical properties. Especially under seismic loads, it is easy to form surface cracks and throughout cracks, ultimately the overall stability of the dam is affected by sliding. In this paper, effects of the characteristics of layers on the stability of RCC dam are studied based on optimization algorithm method.Finite element method is used to analyze the anti-sliding stability of RCC dam under seismic loads, and the main weak parts of the dam and layers are identified. Minimum anti-slide safety factor is calculated through overload method. The relationship between anti-slide safety factor and seismic overload ratio k is obtained. Also the relationship between anti-slide safety factor and strength reduction factor k is obtained through strength reduction method.Horizontal layers are formed due to paving methods used in RCC construction. The difference between interlayer properties of the concrete and concrete itself will affect the overall stability of the dam directly. In this paper, annealing algorithm and finite element analysis methods are combined to search the weakest sliding surface and corresponding anti-slide safety factor. The anti-sliding safety factor is defined according to stress field. Linear elastic model and concrete damage plasticity model are relatively used to obtain stress field. The influence of the shear parameter of the dam on the shape of the sliding surface and corresponding safety factor is investigated through this method.