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Xue X.,University of Sichuan | Li P.,Dadu River Hydropower Development Co.
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2015

Because of the important functions of safety and the economic position of high dams, they could become the main objects to be attacked during war conditions or become the targets of terrorists. Therefore, the safety analysis Taking a RCC arch dam as the research object, a 3D finite element model of arch dam under the action of the explosion load was established and analyzed in this paper. The results have reference values to the antiknock design of these high arch dams. ©, 2015, Shuili Xuebao/Journal of Hydraulic Engineering. All right reserved.

Liu J.,Yalong River Hydropower Development Co. | Hu H.-L.,Dadu River Hydropower Development Co. | Xiao L.,China Three Gorges University | Tang T.-C.,China Three Gorges University
Environment, Energy and Sustainable Development - Proceedings of the 2013 International Conference on Frontier of Energy and Environment Engineering, ICFEEE 2013 | Year: 2014

On the basis of one hydropower station and combing with the current research methods of rock parameters, this work makes numerical simulation and analysis on the fractured rock mass in a typical profile through the equivalent computing method of numerical simulation of the partition grading fractured rock mass. After comparing to calculation results of GSI, the geological evaluation system, it comes to a conclusion that the method suggested in this paper is dependable, and it has a certain significance of project. © 2014 Taylor & Francis Group, London.

Hu Y.,University of Sichuan | Li X.,University of Sichuan | Zhou H.,Dadu River Hydropower Development Co. | Li K.,University of Sichuan | Gu C.,Xihua University
Dianwang Jishu/Power System Technology | Year: 2014

When operating condition of voltage source converter (VSC) based HVDC power transmission system changes, the inductance parameter of inverter reactor changes correspondingly, it leads to decoupling of inner current-loop, which contains inductance parameter, in the dual closed-loop decoupling controller inaccurate or disabled. For this reason, a kind of decoupling controller without inductance parameter in d-q synchronous rotating coordinate is proposed. In allusion to the higher content of low orders of harmonics such as 5-, 7-, 11- and 13-order harmonics in AC systems connected to the inverter side of VSC-HVDC transmission system, a controller, in which the proportion integration (PI) control is cascade connected with quasi-proportional resonance (PR) control, is proposed. Simulation results of example show that using the proposed decoupling control strategy the active power and reactive power can be fast regulated independently, and the harmonics can be effectively suppressed and the power quality of grid-connected VSC-HVDC can be improved.

Guo Q.,University of Sichuan | Pei L.,University of Sichuan | Zhou Z.,Chengdu Engineering Corporation Ltd | Chen J.,University of Sichuan | Yao F.,Dadu River Hydropower Development Co.
Computers and Geotechnics | Year: 2016

High core rockfill dams exhibit complex deformation mechanisms because of complicated geological conditions, many material partitions and severe weather conditions. When realistic parameters cannot be obtained through laboratory tests or engineering analogies because of effects of size or time, back analysis is necessary to predict deformation characteristics. This paper proposes a method of deformation back analysis based on the response surface method and genetic optimization theory. The parameters of the creep and Duncan-Chang models for the Pubugou gravelly soil core rockfill dam are sequentially calculated. Back analysis performed using this method efficiently yields more precise results than those obtained from laboratory-determined parameters. © 2016 Elsevier Ltd.

Zhu Z.,CAS Wuhan Institute of Rock and Soil Mechanics | Sheng Q.,CAS Wuhan Institute of Rock and Soil Mechanics | Xiao P.,Dadu River Hydropower Development Co. | Liu J.,The Second Highway Consultants Co.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2011

Based on the analysis of energy transformation between testing machine and rock specimen, the energy dissipation law in process of unloading confining pressure failure and the relationships between energy and rock specimen deformation and confining pressure are analyzed comprehensively. The study results show that the energy dissipation is greatly related to the failure characteristic of rock specimen and confining pressure. The energy dissipation of ductile failure is greater than that of brittle failure. For the same failure mode, the energy dissipation obviously increases with the increasing confining pressure. Two unloading confining pressure tests show that the energy dissipation of rock specimen presents nonlinear relationship with time, while the energy dissipation of rock specimen presents linear relationship with lateral deformation. Under the same lateral deformation level, the greater the confining pressure is, the greater the energy dissipation is, and the rock specimen presents more brittle characteristic.

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