梯級土石壩連潰數(shù)值模擬
[Abstract]:Dam break has the characteristics of low probability and high risk. Once the dam collapses, it will cause great damage to the downstream area, leading to huge casualties and social and economic losses. As the main dam type, earth rock dam accounts for 95% of all types of dam, and the earth rock dam accounts for 98%. in China. The 13 large and medium-sized hydropower bases include 310 large and medium-sized cascade reservoirs. The dam type in the basin is mostly earth rock dam and panel dam, and the super high dam is distributed centrally. Considering the current development of the cascade reservoir dams in China, it is of great significance to simulate the continuous collapse of the cascade earth rock dams. The mechanism, based on the dam break process of the upstream dam and the influence of the dam break flood on the downstream reservoir, the establishment of the cascade dam collapse numerical model is of great significance for the analysis of the risk of dam break, the flood control scheduling in the reservoir area, the safety control of the cascade basins and the determination of the grade of the reservoir group. Coupled flood evolution calculation and flood regulation analysis, the numerical model of cascade reservoir rockfill dam collapse is established. The main research contents and research results are as follows: (1) according to the comparison and analysis of the dam break model of earth rock dam, the mathematical model of earth dam dam break is determined. The characteristics of the existing dam break model are summarized and analyzed, and five kinds of dam break mechanism models are selected. The model and one parameter model: Mike11DB model, HEC-RAS model, BREACH model, DAMBRK model, DB-IWHR model and fast evaluation model of dam break dam. Through the simulation calculation of typical dam break cases, the calculation accuracy and parameter sensitivity of each model are analyzed and compared, and the comparison analysis shows that the DB-IWHR model has deeply studied the dam break machine. According to the influence of the parameters such as the geometric parameters of the dam, the properties of the material and the initial conditions of the ulceration, the problem that the existing dam failure model can not independently calculate the development of the ulceration and the required parameters is too much. It is of more practical significance for the prediction calculation of the dam break, and is of great application value. Therefore, the DB-IWHR model is selected as the earth rock. The calculation model of dam break is established. (2) a downstream evolution model of dam break flood is established. One dimension numerical calculation method for dam break flood is studied. Based on the theory of Preissmann four point implicit difference scheme, a one-dimensional unsteady flow calculation program for open channel is developed. The program is applied to different boundary conditions by different calculation examples. An unsteady flow evolution process is used to calculate the downstream evolution process of the dam break flood in the Tang Jiashan mountain. Compared with the calculation results of the Mike 11 software, the accuracy and reliability of the dam break flood evolution model are proved. In the current flood situation, the downstream risk analysis is carried out. (3) a cascade dam collapse mathematical model is constructed. Based on the four order Runge Kutta method, the reservoir flood calculation model is established to calculate the change process line of the water level of the downstream reservoir, to determine whether the upstream dam break flood causes the cascade cascade dam collapse in the downstream, and the downstream dam break through the DB-IWHR model is calculated. On the basis of single reservoir dam break model, coupled flood evolution and flood diversion and calculation process, a mathematical model of cascade reservoir rockfill dam collapse is established. Taking the Tang Jiashan Dali cascade reservoir as an example, the simulation calculation of cascade rockfill dam collapse is carried out, and the failure of the downstream reservoir with early warning and different discharge capacity is studied. The downstream cascade reservoirs can adopt additional flood discharge facilities and early warning full sluice discharge, so as to ensure that the dam does not break dam through Diao Hongrong error and avoid the continuous collapse of the cascade reservoir.
【學位授予單位】:鄭州大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TV122.4
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