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Dang F.-N.,Xian University of Technology | Wang X.-W.,Xian University of Technology | Wang X.-W.,Shanxi Water Resources and Hydropower Construction Supervision Company | Tian W.,Changan University | Xu S.-J.,Shandong Provincial Institute of Water Resources
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2012

The stress and strain of high concrete face rockfill dam (CFRD) which was built on steep slope, asymmetric and narrow-deep river valley was studied. The results show that uneven settlement existed in rockfills because of asymmetric between left bank and right bank. Affected by the arch effect of narrow deep valley, later settlement value of rockfills was still great. Because of the effect of steep slope, the axial displacement of concrete panel and deformation gradient in the right (the bank more steep side) was larger than that of left. Finally, a series of improvement measures is proposed, such as adjusting the roller compaction parameters in different part of the rockfills to reduce the uneven settlement value, fully compacting the rockfills with water to reduce the later settlement value, appropriately adjusting concrete panel width and the vertical joint width to reduce tensile stress of side concrete panel and decrease extrusion pressure of the middle concrete panel. Source


Xu S.-J.,Shandong Provincial Institute of Water Resources | Xu S.-J.,Xian University of Technology | Dang F.-N.,Xian University of Technology | Cheng S.-Z.,Shandong Provincial Institute of Water Resources
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

During the process of the percolation, muddy water seepage can form a sediment deposit layer of weak hydraulic permeability to reduce the water leakage, which is different from the clear water seepage. According to the above muddy water seepage theory, the present study proposes that diversion of the muddy water from the Yellow River to the reservoir and then let the water to form the sediment deposit on the bottom to reduce leakage. Firstly, based on the analysis of characteristics of the silt of muddy Yellow River water, the research discusses the influence of the sediment deposit formed by the muddy Yellow River water on the leakage for the plain reservoir. Secondly, through the laboratory test, we get the correlation between the leakage and the sediment deposit formed by different water heads, and finally obtain the certain thickness of the deposit layer with the best impervious effect. Finally, the research results are applied to the seepage control of the plain reservoir; the theoretical calculation and the operation of the project evaluation show that the theory has satisfied effect and can be applied to other similar projects. Source


Wang X.-W.,Xian University of Technology | Wang X.-W.,Shanxi Water Resources and Hydropower Construction Supervision Company | Xu S.-J.,Xian University of Technology | Xu S.-J.,Shandong Provincial Institute of Water Resources | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

The stability of dam slope during rapid drawdown of reservoir water level was computed using limit equilibrium method and limit equilibrium method based on finite element analysis according to unsaturated soil shear strength theory in combination with a specific reservoir. In this computing process, the dissipating process of pore-water pressure was simulated using unsaturated-unsteady seepage theory and the impact of matric suction on shear strength of soil body was taken into consideration, each step of seepage corresponding to a stable situation of the dam. Finally, the comparison between both of stability analysis methods was made. It is found that the rapid drawdown of reservoir water level easily results in the dam slope slipping; the stability of dam slope is enhanced with the dissipating process of water pressure in the dam body; and the matric suction increases the shear strength in this dissipating process. Source

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