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Zhong J.-F.,Nanchang Hangkong University | Wen S.-Y.,Construction and Administration Bureau of South to North Water Diversion Middle Route Project | Hu X.,China Institute of Water Resources and Hydropower Research
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

There are many limitations for important hydraulic project's rock site at present, such as envelopment effects of probability-consistent response spectrum, and frequency stationarity in acceleration time history, etc.. In order to overcome those shortcomings, a new method of determination of ground motion input parameters for important hydraulic project's rock site has been put forward in this study. The effective peak acceleration with different exceeding probability, as well as the dominant potential seismic source which had the largest contribution to the site, have been determined by using probabilistic seismic hazard analysis, which based on effective peak acceleration. The magnitude of scenario earthquake within the dominant potential earthquake sources is determined by the largest probability of magnitude-spatial joint distribution,and the corresponding design response spectra is determined by the attenuation relationship of acceleration response spectra. Then evolutionary power spectrum is gained according to scenario earthquake and the attenuation relationships of evolutionary power spectrum model parameters, and the amplitude and frequency non-stationary acceleration time history at dam site are synthesized by using trigonometric series superposition method, which based on evolutionary power spectra and minimum phase spectrum. In a case study of Shapai dam site, based on the evaluation of regional seismic activities and seismotectonic environment, ground motion input parameters at dam rock site with different exceeding probability, including the effective peak acceleration, design response spectra, amplitude and frequency non-stationarity acceleration time history, are determined. Source

Zhang H.,North China University of Water Conservancy and Electric Power | Zhang H.,Henan Kunxin Hydroelectric Contruction Ltd Company | Han L.,North China University of Water Conservancy and Electric Power | Han L.,Henan Kunxin Hydroelectric Contruction Ltd Company | And 3 more authors.
World Information on Earthquake Engineering | Year: 2012

The methods for seismic stability analysis of slope, such as pseudostatic analysis, time-history method and the dynamic safety degree evaluation method, were introduced. The results of comparison analysis of the three methods show that the dynamic safety degree evaluation method is more accurate. Then the influence of frequency and amplitude of seismic wave on dynamic safety of slope was analyzed. The results show that frequency and amplitude have more influence on stability of the slope, the dynamic safety factor increases with increase of frequency, but its increased amplitude reduces gradually; it decreases with increase of amplitude, and its decreased amplitude reduces too. Source

Jiang Y.H.,China Institute of Water Resources and Hydropower Research | Li L.B.,China Institute of Water Resources and Hydropower Research | Zhang Q.,Construction and Administration Bureau of South to North Water Diversion Middle Route Project | Lu Z.C.,China Institute of Water Resources and Hydropower Research
Applied Mechanics and Materials | Year: 2013

This study analyzes the specific requirements for data transmission in an integrated automation system for safety monitoring of the Middle Route of the South-to-North Water Diversion Project. It introduces the bearing method and network structure of a private wireless digital data network (DDN) based on general packet radio service technology. Moreover, the measures adopted based on the private wireless DDN system for ensuring safe data transmission are expounded. The integration of a wireless outer network and a wired inner network has sufficiently addressed the actual demands of the project. The successful application of this system can be used as a reference for similar projects. © (2013) Trans Tech Publications, Switzerland. Source

Wang J.,Henan Academy of science | Wang J.,HIGH-TECH | Zhao B.,Construction and Administration Bureau of South to North Water Diversion Middle Route Project | Zhao L.,Henan Academy of science | And 4 more authors.
Synthetic Metals | Year: 2015

A silane-bridged polyaniline (PANI)/cotton fiber (CF) composite (designated as PANI/SCF) was prepared by a novel and facile approach in the current study. Aniline-bearing silane molecules were first grafted onto the CF surface through a condensation reaction between hydroxyl groups of cellulose and the silane molecules. Subsequent oxidative polymerization of aniline in the presence of silane-modified CF (SCF) yielded the final PANI/SCF composite, which can be used as the potential Cr(VI) adsorbent. Results showed that the optimal silane grafting conditions were: 0.01 mol/L HAc, EtOH/water volume ratio 95/5, reaction temperature 40 °C and silane dosage 0.1 g (per 0.5 g CF). Using SCF that prepared under the optimal conditions as the substrate, about 4.6% of PANI can be deposited, mostly existing as nanorods and distributing more evenly than those on the raw CF surface. FTIR and XPS analyses further testified the successful chemical bonding of silane and the final deposition of PANI on the fiber surfaces. In comparison with neat PANI, the solid-liquid separation can be achieved by simply taking the fibrous adsorbent out. Besides, the adsorption capacity of PANI/SCF on the basis of PANI mass (dividing Qm by PANI content) was much higher, probably due to the uniform distribution of PANI nanostructures on SCF and the high efficiency of PANI nanostructures in Cr(VI) adsorption. © 2015 Elsevier B.V. All rights reserved. Source

Chen F.,Wuhan University | Chen F.,Changjiang Waterway Planning Design and Research Institute | Li Y.,Wuhan University | Tang J.,Wuhan University | Zhang T.,Construction and Administration Bureau of South to North Water Diversion Middle Route Project
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2010

Analysis and comparison of the field data of group-sized sediment transport for the two cases before and after the dam construction show a great difference of coarse particle transport in different reaches. In the natural river case, deposition of coarse particles is often caused by a dramatic decrease of flow velocity in some reaches, while in the case of reservoir operation the erosion of nearly all sizes of sediment are a consequence of supply shortage from the bed. In the reach closer to the dam site the erosion is more serious than the reaches far from the dam. In a reach far enough, the transport of some size groups will be similar to that of a natural river if the supply from the upstream is sufficient, as these groups are easily saturated. Long-distance erosion downstream a reservoir is caused by shortage of the supply from riverbed, particularly shortage of fine particles. Source

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