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A new method of estimating the equivalent elastic modulus of RCCD

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Science china(Technological Sciences) 2007年第Z1期50卷 136-143页

作者： GU ChongShi1,2?, WU Yuan1, SU HuaiZhi1,2 & TANG LiHui1 1 College of water Conservancy and hydropower Engineering, Hohai University, Nanjing 210098, china 2 National Engineering research Center of water resources Efficient Utilization and Engineering Safety, Nanjing 210098, china College of water Conservancy and hydropower Engineering Hohai University Nanjing China National Engineering research Center of water resources Efficient Utilization and Engineering Safety Nanjing China

Based on the composite material mechanic theory, the analysis method for the equivalent elastic moduli which are parallel and vertical to the construction interface of RCCD is studied in this paper. The differences between the equivalent elastic moduli which are vertical to the construction interface of RCCD gotten from different methods are discussed in detail. The variation range of the equivalent elastic modulus which is vertical to the construction interface of RCCD is studied based on the principle of minimum complementary energy and the principle of minimum potential energy. The effect of the related influential factors on the equivalent elastic modulus is analyzed. The estimation formula of the equivalent modulus which is vertical to the construction interface of RCCD is proposed. The feasibility of the approach proposed in this paper is analyzed through an example.

关键词： RCCD equivalent elastic modulus variation range estimation method

Using soil surface gray level to determine surface soil water content

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Science china Earth Sciences 2010年第10期53卷 1527-1532页

作者： ZHU YuanJun1,2,WANG YunQiang1,2 & SHAO MingAn1,2 1 State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau,institute of Soil and water Conservation,Northwest A & F University,Yangling 712100,china 2 institute of Soil and water Conservation,Chinese Academy of Sciences & Ministry of water resources,Yangling 712100,china State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau Institute of Soil and Water Conservation Northwest A & F University Yangling China institute of Soil and water Conservation Chinese Academy of Sciences & Ministry of Water Resources Yangling China

How to determine surface soil water content(SWC) quickly and accurately is fundamental in studying eco-hydrological processes and their *** we use laboratory experiments to determine surface SWC using soil surface gray level(SGL) values.A negatively exponential relationship exists between SGL and SWC,i.e.,SGL increases with the decrease of *** can be estimated based on initial SGL value(surface gray level when SWC=0),SWC,and a surface roughness coefficient characterized by mean soil particle *** variation range of SGL was larger than that of SWC,indicating that changes in SWC were enhanced in SGL,and that SGL would thus be sensitive to changes in soil *** the 95% confidence level,SWC can be determined by using the relationship between SWC and SGL established by the *** determination of SWC has a high precision when SWC was between dry and saturated.

关键词： Loess Plateau soil water remote sensing surface roughness

Review on hidden trouble detection and health diagnosis of hydraulic concrete structures

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Science china(Technological Sciences) 2007年第Z1期50卷 34-50页

作者： WU ZhongRu1,2?, LI Ji1, GU ChongShi1,2 & SU HuaiZhi1,2 1 College of water Conservancy and hydropower Engineering, Hohai University, Nanjing 210098, china 2 National Engineering research Center of water resources Efficient Utilization and Engineering Safety, Nanjing 210098, china College of water Conservancy and hydropower Engineering Hohai University Nanjing China National Engineering research Center of water resources Efficient Utilization and Engineering Safety Nanjing China

A large number of hydraulic concrete structures have hidden defects such as cracks, erosion, freeze and thaw, thermal fatigue, carbonization. These hidden defects seriously affect the strength, stability and durability of structures. These problems are studied mainly by single monitoring or diagnosis methods at present. The integration of multiple monitoring and diagnosis methods is not applied widely. Besides, the analysis theory on these problems is not developed very well. The systemic study on the aging mechanism of hydraulic concrete structures, time- variation model and health diagnosis is still not enough. The support for engineering practice is limited. Aimed at these major scientific and technological problems and combined with specific projects, study on detection of hidden defects and health diagnosis of hydraulic concrete structure has been carried out. This study includes the following content: field non-destructive examination of hidden defects of hydraulic concrete structures, seepage detection, the construction of in-situ sensing system, the combination of field detection and in-situ monitoring, the mechanism of crack, freeze and thaw, erosion and carbonization of hydraulic concrete structure, mechanism of combination aging; time-variation model of hydraulic concrete structure, theories and methods for health diagnosis of hydraulic concrete structures.

关键词： hydraulic concrete structure hidden trouble detection health diagnosis

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关于拱坝接缝灌浆时间的探讨

水力发电学报 2003年第3期22卷 18-24页

作者：朱伯芳中国水利水电科学研究院北京100038

目前水工建筑物灌浆施工规范规定 ,接缝灌浆时灌区两侧混凝土龄期应多于 6个月 ,这一规定往往给拱坝施工带来相当的困难。本文从坝体和接缝浆体的强度和坝体温度控制等方面进行较深入的分析后 ,认为这一规定过于保守 ,如果中间坝块适当... 详细信息

目前水工建筑物灌浆施工规范规定 ,接缝灌浆时灌区两侧混凝土龄期应多于 6个月 ,这一规定往往给拱坝施工带来相当的困难。本文从坝体和接缝浆体的强度和坝体温度控制等方面进行较深入的分析后 ,认为这一规定过于保守 ,如果中间坝块适当超冷、两岸基础坝块适当提高灌浆时混凝土温度 ,则有可能把接缝灌浆时两旁混凝土龄期从 6个月减少到 1～ 2个月 ,从而使拱坝提前蓄水 4～

关键词：水工结构灌浆时间综合分析拱坝接缝强度温度控制

Hybrid method of limit equilibrium and finite element internal force for analysis of arch dam stability against sliding

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Science china(Technological Sciences) 2011年第4期54卷 793-798页

作者： BAO TengFei1,2,3,XU BaoSong1,2,3 & ZHENG XueQing1,2,3 1State Key Laboratory of Hydrology-water resources and Hydraulic Engineering,Hohai University,Nanjing 210098,china 2National Engineering research Center of water resources Efficient Utilization and Engineering Safety,Nanjing 210098,china 3College of water Conservancy and hydropower Engineering,Hohai University,Nanjing 210098,china State Key Laboratory of Hydrology-water resources and Hydraulic Engineering Hohai University Nanjing China National Engineering research Center of water resources Efficient Utilization and Engineering Safety Nanjing China College of water Conservancy and hydropower Engineering Hohai University Nanjing China

A hybrid method of limit equilibrium and finite element internal force for analysis of arch dam stability against sliding is *** finite element internal force method(FEIFM) is used to provide more accurate thrust forces acting on the faces of a slip body,and the limit equilibrium method(LEM) is employed to evaluate the factor of safety of the slip *** method presented can deal with a slip body with large amount of geometrically complex slip *** addition,compared with the traditional LEM,it can meet the balance condition of the forces in the slip *** example shows that the factor of safety obtained by the method presented agrees well with the theoretical solution.A practical example is also presented to demonstrate the application of the method in the stability analysis of an arch dam *** results from the examples show that the method is promising in analysis of arch dam stability against sliding.

关键词： arch dam stability against sliding limit equilibrium method finite element internal force method

Designing regional pattern for ecosystem restoration:A case study

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Science china(Technological Sciences) 2006年第Z1期49卷 86-97页

作者： LI Guoqiang , MA Keming, FU Bojie & LIU Shiling State Key Lab of Systems Ecology, research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, china Department of water Environment, china institute of water resources and hydropower research, Beijing 100038, china School of Environmental Sciences, Beijing Normal University, Beijing 100875, china State Key Lab of Systems Ecology Research Center for Eco-environmental Sciences Chinese Academy of Sciences Beijing China Department of water Environment China Institute of Water Resources and Hydropower Research Beijing China School of Environmental Sciences Beijing Normal University Beijing China

Designing regional pattern is challenging for ecosystem restoration both in theory and in practice. The present study proposed a new approach to design regional pattern for ecosystem restoration with a case in the arid valley of Upper Minjiang River, SW china. The procedures are: (1) Determine the regional pattern of main environmental factors based on the relationships between the important environmental factors and the main geographical factors generated from DEM data. (2) Overlay the maps of the main environmental factors. (3) Generate a lookup table according to the species selection rule we proposed to link the candidate restoration species to the main environmental factors.(4) Determine the regional pattern of ecosystem restoration by positioning the restoration species in the map of environmental factors according to the lookup table. The regional restoration pattern designed in this way would be applicable not only to restoring a region, but also to predicting the future landscape change.

关键词： environmental factors, GIS, restoration species, Upper Minjiang River Valley.

Game model of safety monitoring for arch dam deformation

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Science china(Technological Sciences) 2008年第S2期51卷 76-81页

作者： SU HuaiZhi1,2,WU ZhongRu1,2,GU YanChang1,2,HU Jiang1 & WEN ZhiPing3 1 College of water Conservancy and hydropower Engineering,Hohai University,Nanjing 210098,china 2 National Engineering research Center of water resources Efficient Utilization and Engineering Safety,Nanjing 210098,china 3 Department of Computer Engineering,Nanjing institute of Technology,Nanjing 210013,china College of water Conservancy and hydropower Engineering Hohai University Nanjing China National Engineering research Center of water resources Efficient Utilization and Engineering Safety Nanjing China Department of Computer Engineering Nanjing Institute of Technology Nanjing China

Arch dam deformation is comprehensively affected by water pressure,temperature,dam's structural behavior and material properties as well as other *** them the water pressure and temperature are external factors(source factors) that cause dam deformation,and dam's structural behavior and material properties are the internal factors of deformation(resistance factors).The dam deformation is the result of the mutual game playing between source factors and resistance ***,resistance factors of structure and materials that reflect resistance character of arch dam structure are introduced into the traditional model,where structure factor is embodied by the flexibility coefficient of dam body and the maximum dam height,and material property is embodied by the elastic modulus of *** the basis of analyzing the correlation between dam deformation and resistance factors,the game model of safety monitoring for arch dam deformation is put forward.

关键词： arch dam deformation monitoring model flexibility coefficient game theory

Dam risk assistant analysis system design

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Science china(Technological Sciences) 2008年第S2期51卷 101-109页

作者： HE XianFeng1,2,3,GU ChongShi3,4,WU ZhongRu3,4 & SU HuaiZhi3,4 1 Yellow River institute of Hydraulic research,Zhengzhou 450003,china 2 Embankment Security Defect Prevention and Control Engineering research Center of MWR,Zhengzhou 45000,china 3 College of water resources and hydropower Engineering,Hohai University,Nanjing 210098,china 4 National Engineering research Center of water resources Efficient Utilization and Engineering Safety,Hohai University,Nanjing 210098,china Yellow River institute of Hydraulic research Zhengzhou China Embankment Security Defect Prevention and Control Engineering research Center of MWR Zhengzhou China College of water resources and hydropower Engineering Hohai University Nanjing China National Engineering research Center of water resources Efficient Utilization and Engineering Safety Hohai University Nanjing China

In order to reduce the labor intensity and task difficulty of dam risk analysis and to meet the actual requirement of dam risk analysis,it is necessary to establish a dam risk assistant analysis *** program structure and the implementation ways of the dam risk assistant analysis system are analyzed,and a procedural framework with "three-tier and multi-database" structure and "level structure" is *** concept of dam risk assessment system modular development is proposed and the coupled mode of function module and data is ***,the dam risk assistant analysis system is developed using Delphi visual programming language.

关键词： dam risk risk analysis assistant analysis system

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水泵进水池旋涡研究的主要进展

水力发电学报 2004年第5期23卷 92-96页

作者：何耘中国水利水电科学研究院水力学所北京100044

泵站进水池中的旋涡直接影响进水池流态及水泵运行效率。本文就旋涡类型、影响因素及其进水池中旋涡的控制方法等方面的多年研究成果给予了分析和总结 ,对于进水池旋涡的水力模型相似性、PIV现代量测技术的应用及数值模拟的最新研究进... 详细信息

泵站进水池中的旋涡直接影响进水池流态及水泵运行效率。本文就旋涡类型、影响因素及其进水池中旋涡的控制方法等方面的多年研究成果给予了分析和总结 ,对于进水池旋涡的水力模型相似性、PIV现代量测技术的应用及数值模拟的最新研究进展进行了综述。

关键词：水力学进水池旋涡综述流态