Dadu River Hydropower Development Co.

Chengdu, China

Dadu River Hydropower Development Co.

Chengdu, China
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Qin L.,University of Sichuan | He Y.,Dadu River Hydropower Development Co. | Huang W.,University of Sichuan | Ma G.,University of Sichuan
AIP Conference Proceedings | Year: 2017

To have a better understanding of the rainfall and runoff temporal variation in Beibei station of Jialing River, Mann-Kendall test, R/S analysis method and multi-regression model were used to analyze the characteristics of rainfall and runoff in the study area. The results show that (1) rainfall in spring has remarkable descending trend, runoff has obviously downward trend in autumn and the whole year. (2) Rainfall has three fluctuation points during 50 years, which appear in 1958, 1978 and 1991, and the fluctuation points of runoff happen in 1987 and 1990, respectively. (3) Hurst coefficients of annual rainfall and runoff are both greater than 0.7, which mean a significant positive continuity in the future. (4) According to the linear regression equation established by rainfall-runoff model, the runoff in June, July and August are fitted; the results indicate that the regression model can simulate flood season runoff well. © 2017 Author(s).

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.

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.

Duan B.,University of Sichuan | Duan B.,Dadu River Hydropower Development Co. | Zhang L.,University of Sichuan | Chen G.,Dadu River Hydropower Development Co. | And 2 more authors.
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2013

The site of Dagangshan arch dam are featured with complicated geologic structures of various types of dikes, faults, joints and fissures, and its global stability is greatly influenced by these structures. In this work, methods of geomechanical model test and 3D nonlinear FEM calculation were used to study the global stability, including an analysis on geological defects, dam deformation, abutment displacements, failure process and failure mechanism. This analysis shows global safety factors of 5.0~5.6 by model test and 5.6~6.0 by FEM computation. On the basis of these factors, dam safety is evaluated and reinforcement measures are suggested.

Duan B.,University of Sichuan | Duan B.,Dadu River Hydropower Development Co. | Zhang L.,University of Sichuan | He J.,University of Sichuan | And 2 more authors.
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2012

Topographic and geologic conditions of hydropower engineering are often complicated, and rock mass is featured by various kinds of joints and fissures, so its permeability is zonal and anisotropic. A 3D finite element model is developed for such complicated rock mass conditions at the Dagangshan hydropower station and its seepage field is studied with this model in combination with a quadratic programming method, permeability tensor analysis method and free-surface-fixed meshing method. Back analysis based on comparison of the calculated and observed water levels is used to calculate the natural seepage field and determine its boundary conditions and seepage parameters. This work provides a basis for analysis of other operating conditions and optimal seepage control schemes. © right.

Li P.,Dadu River Hydropower Development Co. | Yang X.,University of Sichuan | Xue X.,University of Sichuan | Li Y.,University of Sichuan
World Information on Earthquake Engineering | Year: 2015

To build high earth-rockfill dam on thick cover foundation in high earthquake intensity region will face many problems such as dynamic stability, dam foundation liquefaction etc. It is highly necessary to carry out dam's seismic dynamic response to provide the guidance for design and construction of the dam. As an example, three-dimensional dynamic FEM was employed to analyze the seismic response of Pubugou corewall rockfill dam. The earthquake resistance capacity of corewall and seepage proof wall, and the liquefaction possibility of foundation sand layer were researched. According to the analysis results, some optimized measures for dam structure, material, and so on, were put forward to improve the seismic resistance of Pubugou corewall rockfill dam. The conclusions drawn in this paper can provide a reference to similar engineering. ©, 2015, Science and Technology Periodical Press. All right reserved.

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.

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