Study on seepage characteristics of inclined wall dam after heavy drought

2018 2nd International Workshop on Renewable Energy and Development

能源学;经济学

Wei, Y.E.^1 ; Fuheng, M.A.^1,2

Nanjing Hydraulic Research Institute, Nanjing

210029, China^1

State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering, Nangjing

210029, China^2

关键词: Inclined walls;    Landslide hazard;    Numerical calculation;    Permeable channels;    Physical model test;    Pore-water pressures;    Seepage characteristics;    Transition layers;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/153/5/052032/pdf
DOI  :  10.1088/1755-1315/153/5/052032

来源: IOP

【 摘 要 】

For seepage of the dam slope with cracks after drought, there are two methods to study including the physical model test and numerical calculation. However, the physical model test can not visualize the seepage field in the dam body intuitively, and the mathematical model is not accurate because of the precision of the parameter. So in this paper, combined physical model with mathematical model, the surface crack development on the dam slope and the changes of pore water pressure were studied through the physical model test, and then numerical calculation was carried out to analyze the internal seepage of the dam body. The results showed that cracks were more likely to develop at middle of the upstream dam slope and dam heel, and cracks for different degrees appeared at different parts of the dam slope after drought. The development of cracks provided a preferential permeable channel which caused that the area near the crack was easily to become saturated. The saturated zone kept expanding leading the infiltration line to be close to the transition layer and the infiltration line was no longer a smooth curve. There were seepage damages and landslide hazards existing with such seepage characteristics, which would threaten the safety of the dam.