Research On Seepage Stability And Seepage Control Optimization Of HongXing Reservoir

Seepage and seepage control is an important issue in earth-rock dam project, it directly relates to the safety and investment. Many hydraulic structures'accidents are related to the crash of the seepage. Flow problem is complexity. So, How to simulate the characteristics of the seepage field area more accurately and accurately by the use of numerical simulations is the focus of flow simulation.Hong Xing reservoir located in 6km north of Suihua City of Heilongjiang Province, it provides town water and irrigation water for Suihua city, belonging to medium-sized plain reservoir. It leaked seriously after the completion of the reservoir. In this paper, for the selection of treatment options, analyzed hydrogeology and geological conditions of the study area based on the pre-survey and design data, groundwater level data and added later based on exploration data; used Chinese Academy of Water Conservancy and Hydropower formula, combined with an analytical model, three-dimensional numerical simulation of seepage, carried out the stability and seepage control optimization.This paper mainly includes the following aspects:By analyzing geological borehole data, test exploration data, groundwater level dynamic data, dam design data in the study area, comprehensive understanding of the reservoir area of the hydro-geological and engineering geological conditions.Through analyzing the infiltration sabotage mechanism and infiltration stability factors of the soil, its decisive factor depends on the composition and structural characteristics; analysis foundation soil particles composition and basic characteristics, and judged the type of soil infiltration and sabotage with methods, then, calculated its anti-permeability and whose allowed with methods.On the basis of identifying the infiltration structure, permeability distribution and boundary conditions of the rock and soil in the dam area, established a three-dimensional hydro geological flow concept model and mathematical model of the study area. Using the three-dimensional finite element groundwater flow system Feflow software simulated and analyzed the study area. Statistics the dam leakage and infiltration foot slope department. Compared the leakage combined with analytical method. And then analyzed the necessity and reasonable to the three-dimensional flow simulation model.Through the comparative analysis of the flow field characteristics and anti-seepage effect under the condition of the seepage flow, combined with the design of seepage in the reservoir area and dam foundation to allow the infiltration of the slope, the anti-programs with the design conditions and the best dialysis program are given, and the most reasonable anti-programs are determined in the safe,economic principles.This paper made the following results:1. Through draw soil sub-curve of the study area, and analyzed the foundation and the basic characteristics of soil particles, reached the types of infiltration and sabotage that occurred may be as follows:①T he form of infiltration and sabotage of surface layer clay is flow soil type; The form of infiltration and sabotage of Coarse sand②layer is flow soil; The form of infiltration and sabotage of Coarse sand③layer is flow soil; The form of infiltration and sabotage of Fine gravel④layer is flow soil; The form of infiltration and sabotage of Coarse sand⑤layer is flow soil.2. Adopt the necessary hydro-geological and engineering geological exploration test, on the basis of identifying the infiltration structure, permeability distribution and boundary conditions of the rock and soil in the dam area, established a three-dimensional hydro geological flow concept model and mathematical model of the study area. Using the three-dimensional finite element groundwater flow system Feflow software simulated and analyzed the study area. And gaven the distribution of Seepage field in the variety of programs.3. Through the comparative analysis of distribution of seepage field and anti-seepage affect of various seepage control programs in sand and gravel layers. We can see that when no anti-seepage treatment, leakage in the reservoir area mainly concentrated near the 2+000,3+500 and 8+800 (Xie villages); when taken to deal with the entire impervious in dam section leakage has been almost obviously control. And different programs impermeable layer in no dam section has little effect to Seepage field in sand and gravel layers. 4. Through compare and analysis the calculation of leakage and Hydraulic gradient we can see that the designed Program 2,3,4,5 are all allowed leakage volume and permeability stability. Only from the leakage, program 4 is the best one. But program 2 is the Minimum quantity one. Then, from the security, economic and rational, determined the program 2 (there are whole Impermeable in dam, and no impervious with no dam) to be the best anti-optimal design.