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Deng Y.,Yellow River Institute of Hydraulic Research | Zhang B.-S.,Research Center on Levee Safety Disaster Prevention
Applied Mechanics and Materials | Year: 2014

The Yellow River is the most frequent river for ice flood in our country, including the Ningxia-Inner Mongolia reach is most serious. At present, it lacks basic understanding for thermodynamic factors, power factor, river boundary conditions in ice formation and transport, so needs to increase ice flood information collection and research efforts of Yellow River. The paper introduces ice-wireless video remote monitoring system of Yellow River in Inner Mongolia key sections, mainly focuses on structure and function of the system, which introduces wireless video monitoring technology into ice flood disaster research of Yellow River, and the obtained images were processed with threshold segmentation method. At the same time, the observed data was analyzed in 2012, which demonstrates the applicability and reliability of the device. © (2014) Trans Tech Publications, Switzerland. Source


Li N.,Yellow River Institute of Hydraulic Research | Li N.,Research Center on Levee Safety Disaster Prevention | He X.,Yellow River Institute of Hydraulic Research | He X.,Research Center on Levee Safety Disaster Prevention | And 3 more authors.
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2014

Cemented sand and rockfill (CSR) material is a new type of material for dam construction, with a wide application prospect. Its material properties lie between concrete and rockfill material. This paper presents strain-stress curves of CSR material under different confining pressures and ages obtained from a great number of large-scale triaxial tests, and describes the influences of these two factors, including variations in breaking strength and volumetric deformation with the factors and variation in shear strength with the age. A regression analysis of test data shows the correlation of breaking strength with confining pressure and age and the correlation of shear strength with age. The results would be useful for development of constitutive models and design of dams with CSR material. ©, 2014, Tsinghua University Press. All right reserved. Source


Deng Y.,Yellow River Institute of Hydraulic Research | Deng Y.,Research Center on Levee Safety Disaster Prevention | Zhang X.,Yellow River Institute of Hydraulic Research | Zhang X.,Research Center on Levee Safety Disaster Prevention
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2013

Haibowan project on the Inner Mongolia section of the Yellow River mainstream is a comprehensive hydraulic project for ice run safety and electricity generation. After construction, it will enhance the ice run safety in its upstream and downstream reaches. In this study, an ice movement model covering a channel section of 15 kilometers long upstream to the project was built to study the ice run around the site of Wuda railroad bridge under different flow ice densities and different flow rates. This paper analyzes the similarity conditions of this model and compares the results of ice movement pre and post dam construction. Test results show that in low flow conditions, without the dam it is relatively easier to form an ice dam with an increase in water depth near the bridge site, while after dam construction, the situation is improved under the influence of reservoir backwater so that the danger of serious ice formation is reduced. Thus, the dam construction has no adverse effects in terms of ice run near the bridge. This study provides exploratory results of ice movement that would be useful for evaluation of the effects of Haibowan reservoir on ice control near the bridge site. Source


He X.,Yellow River Institute of Hydraulic Research | He X.,Research Center on Levee Safety Disaster Prevention | Zhao S.,Yellow River Institute of Hydraulic Research | Zhao S.,Research Center on Levee Safety Disaster Prevention | And 2 more authors.
Applied Mechanics and Materials | Year: 2010

The corrosion of steel will have a bad impact on the safety of reinforced concrete structure. In severe cases, it may even be disastrous. In order to understand the impact of steel corrosion on the structure, tests are carried out to study corrosion and expansion rules of steel bars as well as the impact rules of corrosion on bond force between steel and concrete. The results show that wet and salty environment will result in steel corrosion; relatively minor corrosion will not cause expansion cracks of protection layers; when steel rust to a certain extent, it will cause cracks along the protection layer; when there exists minor corrosion in steel and the protection layer does not have expansion cracks, the bond force is still large and rapidly decreases as the corrosion rate increases. © (2010) Trans Tech Publications, Switzerland. Source


He X.,Yellow River Institute of Hydraulic Research | He X.,Research Center on Levee Safety Disaster Prevention | Leng Y.,Yellow River Institute of Hydraulic Research | Leng Y.,Research Center on Levee Safety Disaster Prevention | And 2 more authors.
Applied Mechanics and Materials | Year: 2010

Affected by both of the internal and external factors during work process, the dam monitoring effect variable often generates complex cycles such as jumps, compendium, and re-jumps, which shows a high degree of non-linearity that brings a lot of trouble in the establishment of regular dam safety monitoring forecast model. Drawing on the threshold thought of the threshold autoregressive model, the threshold factor and the threshold value are introduced in the conventional regression model. By making use of the suggested best fitting correlation analysis method to determine the threshold factor and the threshold value, the threshold regression model is established. Application example shows that the method for dam safety monitoring forecast can obtain satisfactory results. © (2010) Trans Tech Publications, Switzerland. Source

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