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

Science china(Technological Sciences) 2007年第z1期50卷 34-50页

作者： wu zhongru1,2.,{2.,{2.,2.& su huaizhi1,2.1 college of water conservancy and hydropower engineering, hohai university, Nanjing 2.0098, china 2.National engineering Research Center of water Resources Efficient Utilization and engineering Safety, Nanjing 2.0098, china college of water {{2. and hydropower engineering Hohai University Nanjing 210098 China National engineering Research Center of water Resources Efficient Utilization and engineering Safety Nanjing 210098 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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Assessment model of dam operation risk based on monitoring data

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Science china(Technological Sciences) 2007年第z1期50卷 144-152页

作者： wu zhongru1,2., su {2.,{2. guO HaiQing1 1 {2. of water conservancy and hydropower engineering, hohai university, Nanjing 2.0098, china 2.National engineering Research Center of water Resources Efficient Utilization and engineering Safety, Nanjing 2.0098, china 1. college of water {{2. and hydropower engineering Hohai University Nanjing 210098 China 2. National engineering Research Center of {2. Resources Efficient Utilization and engineering Safety Nanjing 210098 China

Although the dams produce remarkable social and economic benefits, the threat made by unsafe dams to the life and property of people who live in the lower river area is un-negligible. Based on the monitoring data which reflect the safety condition of dams, the risk degree concept is proposed and the analysis system and model for evaluating risk degree (rate) are established in this paper by combining the reliability theory and field monitoring data. The analysis method for risk degree is presented based on Bayesian approach. A five-grade risk degree system for dam operation risk and corresponding risk degree is put forward according to the safety condition of dams. The operation risks of four cascade dams on some river are analyzed by the model and approach presented here and the result is adopted by the owner.

关键词： dam monitoring data operation risk degree analysis model

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Research on stability of the accumulated rock-soil body of reservoir bank under rainfall condition

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Science china(Technological Sciences) 2009年第9期52卷 2528-2535页

作者： gu chongshi1,2.wu HaiZhen1,2.& su huaizhi1,{2. {2. of water Resources and hydropower engineering,hohai university,Nanjing 2.0098,china 2.National engineering Research Center of water Resources Efficient Utilization and engineering Safety,hohai university,Nanjing 2.0098,china 3 jiangxi water conservancy Research Institute,Nanchang 33002.,china 1. college of water Resources and {{2. engineering Hohai University Nanjing 210098 China 2. National engineering Research Center of {2. Resources Efficient Utilization and engineering Safety Hohai University Nanjing 210098 China 3. jiangxi water conservancy Research Institute Nanchang 330029 China

The shear strength parameters property of rock-soil aggregates in embankment slope of reservoir,that is,the relationship between cohesion and gravel content,between friction angle and gravel content,and the relationship between cohesion and water content,between friction angle and water content,is studied based on the direct shear test results,the shear strength change law of the rock-soil aggregates is given,and the unsaturated shear strength formulation of rock-soil aggregates that could consider suction and saturation degree influence is put forward in this paper,through which the sliding or failure physical mechanism of this type of slope under the condition of rainfall infiltration is studied. Also the 3D unsteady saturated-unsaturated seepage field and its FEM resolving mode are established based on the analysis of the slope rainfall infiltration process. Case study with this method indicates that the minimum safety factor of the accumulated rock-soil aggregates dose not arrive at the moment of rainfall cessation,but appears several hours after the rainfall cessation,this phenomenon is in accordance with the practical slope {{2.'s failure process and could explain appropriately the slope failure caused by rainfall infiltration. Research results in this paper have an important reference value for the research on stability of the accumulated rock-soil aggregates in embankment slope of reservoir,and can enrich the stability analysis method and relevant theory of reservoir embankment slope.

关键词： reservoir bank slope rock-soil aggregates rainfall infiltration saturated/unsaturated seepage

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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., {2. Yuan1, su huaizhi1,{2. TANG liHui1 1 {2. of water conservancy and hydropower engineering, hohai university, Nanjing 2.0098,{12. 2.National engineering Research Center of water Resources Efficient Utilization and engineering Safety, Nanjing 2.0098,{12. college of water {{2. and hydropower engineering Hohai University Nanjing 210098 China National engineering Research Center of water Resources Efficient Utilization and engineering Safety Nanjing 210098 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

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Risk analysis model for landslide mass of high slope in dam area

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Science china(Technological Sciences) 2008年第S2期51卷 25-31页

作者： gu chongshi1,2.HE XianFeng3,4,{2.,{2.,2.1 college of water conservancy and hydropower engineering,hohai university,Nanjing 2.0098,china 2.National engineering Research Center of water Resources Efficient Utilization and engineering Safety,Nanjing 2.0098,china 3 Yellow River Institute of Hydraulic Research,Zhengzhou 450003,china 4 Embankment Security Defect Prevention and Control engineering Research Center of MWR,Zhengzhou 450003,china 1. college of water {{2. and hydropower engineering Hohai University Nanjing 210098 China 2. National engineering Research Center of {2. Resources Efficient Utilization and engineering Safety Nanjing 210098 China 3. Yellow River Institute of Hydraulic Research Zhengzhou 450003 China 4. Embankment Security Defect Prevention and Control engineering Research Center of MWR Zhengzhou 450003 China

In order to identify the threat of reservoir bank landslide to dam safety and reduce the risk of dam failure,impact factors of the landslide are *** concept of landslide risk degree is put forward to measure the threat of landslide to dam *** monotony of the landslide risk assessment function which changes with different affecting factors is analyzed *** on gene automatic programming,a data mining model of the landslide risk assessment function is constructed combined with impact factors of reservoir bank landslide on dam *** the assessment function of landslide risk has been excavated and established according to practical project information,which provides a valuable reference for analyzing the impact of landslide on dam risk.

关键词： landslide dam failure risk landslide risk

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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.{2.,2.gu YanChang1,2.HU jiang1 & WEN ZhiPing3 1 {2. of water conservancy and hydropower engineering,hohai university,Nanjing 2.0098,china 2.National engineering Research Center of water Resources Efficient Utilization and engineering Safety,Nanjing 2.0098,china 3 Department of Computer engineering,Nanjing Institute of Technology,Nanjing 2.0013,china college of water {{2. and hydropower engineering Hohai University Nanjing 210098 China National engineering Research Center of water Resources Efficient Utilization and engineering Safety Nanjing 210098 China Department of Computer engineering Nanjing Institute of Technology Nanjing 210013 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

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Back analysis of mechanical parameters of roller compacted concrete dam

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Science china(Technological Sciences) 2010年第3期53卷 848-853页

作者： gu chongshi 1,2.3,li Bo 1,XU guangLei 4 &YU Hong 1,2.3 1 State Key Laboratory of Hydrology-water Resources and Hydraulic {2.,hohai university,Nanjing 2.0098,china 2.6} of water conservancy {12.,hohai university,Nanjing 2.0098,china 3National {2. Research Center of water Resources {2. Safety,Efficient Utilization and Nanjing 2.0098,china 4 Nanjing Hydraulic Research Institute,Nanjing 2.002.,china 1. State Key Laboratory of Hydrology-water Resources and Hydraulic engineering Hohai University Nanjing 210098 China2. College of Water Conservancy Hydropower Hohai University Nanjing 210098 China3. National Engineering Research Center of Water Resources Engineering Safety Efficient Utilization and Nanjing Nanjing 210098 China4. Nanjing Hydraulic Research Institute Nanjing 210029 China

In view of the diversity and complexity of mechanical parameters of roller compacted concrete dam(RCCD),the uniform design method,partial least-squares regression(PLS)and least squares support vector machine(LSSVM)were applied to the back analysis of RCCD with the use of the complex nonlinear relationship between dam mechanical parameters and dam *** the process of back analysis,the initial samples of parameters were designed with uniform design ***,a transversely isotropic model of RCCD was established by *** *** this model,training samples of LSSVM model could be *** then,the complex nonlinear relationship between relative values of hydraulic components of dam displacements and mechanical parameters was ***,actual relative values of dam hydraulic components are isolated from the measured data of dam displacements by using *** inputting the isolated relative values into LSSVM model,the back analysis values of RCCD mechanical parameters can be *** example analysis showed that mechanical parameters obtained by the above-mentioned back analysis method are reasonable,and the back analysis method is feasible.

关键词： roller compacted concrete dam mechanical parameters back analysis

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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,{2. zhongru3,4 & su {2.3,4 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 2.0098,china 4 National engineering Research Center of water Resources Efficient Utilization and engineering Safety,hohai university,Nanjing 2.0098,china Yellow River Institute of Hydraulic Research Zhengzhou 450003 China Embankment Security Defect Prevention and Control engineering Research Center of MWR Zhengzhou 45000 China college of water Resources and {{2. engineering Hohai University Nanjing 210098 China National engineering Research Center of water Resources Efficient Utilization and engineering Safety Hohai University Nanjing 210098 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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ON NECESSITY OF PLACING AN AERATOR IN THE BOTTOM DISCHARGE TUNNEL AT THE LONGTAN hydropower STATION

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Journal of Hydrodynamics 2006年第6期18卷 698-701页

作者： wu jian-hua wu Wei-wei RUAN Shi-ping college of water {{2. and hydropower engineering Hohai University Nanjing 210098 China

The air entrainment for avoiding cavitation damage has been widely used in long free flow tunnels. It is crucial to determine whether an aerator is needed for shorter tunnels. In this article, the bottom discharge tunnel at the Longtan hydropower Station was involved, for which the free flow tunnel section was only 50.00 m long. The cavitation in the tunnel with and without the aerator was investigated using the physical models of the scale 1/30, through the measurements of cavitation noise. The experimental results show that it is necessary to place the aerator at the inlet of the free flow section for higher reservoir level to protect this tunnel from cavitation damage.

关键词： aerator bottom discharge tunnel cavitation damage cavitation noise Longtan hydropower Station

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碾压混凝土坝施工层面等效变形参数推算

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水电能源科学 2009年第4期27卷 77-80页

作者：周兰庭顾冲时河海大学水利水电工程学院江苏南京210098 河海大学水资源高效利用与工程安全国家工程研究中心江苏南京210098

针对分层碾压的施工方法使碾压混凝土坝坝体呈层状结构且具横观各向同性特征,将碾压混凝土施工层面视为横观各向同性体,通过对施工层面的本体和层面影响带进行力学模型概化,提出了施工层面在层面水平、层面垂直及任意层面倾角下的变形... 详细信息

针对分层碾压的施工方法使碾压混凝土坝坝体呈层状结构且具横观各向同性特征,将碾压混凝土施工层面视为横观各向同性体,通过对施工层面的本体和层面影响带进行力学模型概化,提出了施工层面在层面水平、层面垂直及任意层面倾角下的变形参数的理论解,并以某碾压混凝土重力坝为例进行求解。研究结果表明,采用等效参数模式的有限元计算结果与施工层面模式的有限元计算结果较吻合,方法合理,计算效率高,可供类似工程计算借鉴。

关键词：碾压混凝土坝施工层面变形参数理论解

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