Liu J.X.,North China University of Water Conservancy and Electric Power |
Wu H.J.,North China University of Water Conservancy and Electric Power |
An Z.Q.,Henan Water and Power Engineering Consulting Co.
Applied Mechanics and Materials | Year: 2013
On the analysis of worldwide situation of river ecological restoration, this paper takes the Jialu River in Zhengzhou city as an example, carries out the study on ecological improvement of traditional river projects in six aspects, such as the arrangement of watercourse plane and section morphology, the design of ecological revetment engineering course, the engineering measures to create artificial imitation of natural habitats, the shallow surface flow unit engineering design of wetland and artificial wetland treatment, the protection and combing with floodplain woodland and the plants disposition of waterfront area. The results may provide the reference for the ecological restoration technology. © (2013) Trans Tech Publications, Switzerland.
Zhang H.Y.,North China University of Water Conservancy and Electric Power |
Zhang H.Y.,Henan Kunxin Hydroelectric Construction Co. |
Zhang X.Q.,North China University of Water Conservancy and Electric Power |
Zhang X.Q.,Henan Kunxin Hydroelectric Construction Co. |
And 2 more authors.
Applied Mechanics and Materials | Year: 2013
Dynamic constitutive models and liquefaction characteristics of soil are critical in the seismic stability analysis on embankment dams. The P-Z constitutive model, which is a kind of the multi-mechanism plastic model based on generalized plasticity, is mainly introduced in this paper. Considering soil as two-phase media, based on the Biot fluctuation theory and the P-Z model, the dynamic analysis formulation of two-phase media is established, and the criterion of soil liquefaction is proposed through investigations, where the generation and dissipation process of soil pore pressure and the variations of effective stress are taken into account. Furthermore, the interface conditions between two-phase media and the other types of medium are derived and the examples of verification are presented. © (2013) Trans Tech Publications, Switzerland.
Cheng H.,Zhengzhou University |
Liu G.,Henan Water and Power Engineering Consulting Co. |
Gao D.,Zhengzhou University
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2013
Direct shear experiment of Z-shaped adhesive specimens was conducted to study the bonding shearing performance of the interface of new steel fiber reinforced concrete to old concrete. A shear stress-displacement curve of this bonding interface was obtained and the major factors on the bonding shear were considered, such as steel fiber volume fraction, roughness of interface and interface adhesive agent. The test results indicate that the bonding shear strength increases with the roughness of old concrete surface and it also depends on the adhesive agent on the interface. Steel fiber in the new concrete can improve the interface performances. If the steel fiber volume fraction is increased within a certain range, the ultimate deformation and bonding shear strength at the breaking of adhesive specimen are gently increased. Based on these results, this paper puts forward formulae for calculating the bonding shear strength and the shear stress-displacement relationship.
Zhao J.,Key Laboratory of Northwest Water Resources and Environment Ecology of MOE at XAUT |
Zhao Y.,Henan Water and Power Engineering Consulting Co. |
Huang Q.,Key Laboratory of Northwest Water Resources and Environment Ecology of MOE at XAUT |
Tian X.,Key Laboratory of Northwest Water Resources and Environment Ecology of MOE at XAUT
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2014
For lasting peace and stability of the Yellow River and sustainable economic and social development in this watershed, it is important to know how much risk in water and sediment regulation of this river. This study identifies the risk of water and sediment control system caused by uncertainty and randomness factors, and calculates the degree of correlation of each factor with the objectives of this system using a stepwise regression model to filter out major risk factors. A BP neural network model was used for risk estimation of the system. We calculated the risk levels for the main reaches in the system using a comprehensive fuzzy evaluation model based on entropy weight, and made an improvement on the index system of risk evaluation. This procedure has been applied to evaluation of a scheme that takes the regulation of the Xuxian and Xiaolangdi reservoirs as a central measure, and it shows a low risk of this scheme. New risk management measures are suggested to improve the existing regulation system of the Yellow River in consideration of the existing conditions and risk-benefit factors, etc., including efforts to continually improve the existing water and sediment control system, speeding up the construction work of the Guxian, and further development of Heishanxia, Qikou, Dongzhuang and the south-to-north water diversion project. © Copyright
Liu S.-H.,Hohai University |
Xue X.-H.,Henan Water and Power Engineering Consulting Co. |
Fan K.-W.,Hohai University |
Xu S.-Y.,Hohai University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014
The retaining wall constructed with soilbags is relatively flexible and may deform under the action of the lateral earth pressure. The distribution and value of the lateral earth pressure are quite different from those of a rigid retaining wall. Model tests are performed on a retaining wall constructed with soilbags to investigate the deformation mode of the wall and the failure mode of the back-filled soil. The distribution of the earth pressures along the height of the wall and the horizontal transfer within the retaining wall are investigated. An equation for calculating the earth pressure on the retaining wall of soilbags is derived from the force equilibrium of a differential element. The earth pressures calculated by the derived equation agree roughly with the experimental measurements. The frictions between the soilbags are experimentally investigated, and are used to explain the horizontal decrease of the earth pressures within the retaining wall.