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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 HuaiZhi1,2.1 College of Water resources and Hydropower engineering,Hohai University,{2. 2.0098,{3. 2.national engineering research center of Water resources Efficient utilization and engineering Safety,Hohai University,{2. 2.0098,{3. 3.Jiangxi Water Conservancy research Institute,Nanchang 3.002.,{3. College of Water resources and Hydropower engineering Hohai University Nanjing China national engineering {2. {3. of Water resources Efficient utilization and engineering Safety Hohai University Nanjing China Jiangxi Water Conservancy research Institute Nanchang 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 3. 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 engineering's failure process and could explain appropriately the slope failure caused by rainfall infiltration. {2. results in this paper have an important reference value for the {2. 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

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 2.0098,{3. 2.7} engineering research center of Water resources Efficient {12. and engineering Safety,nanjing 2.0098,{3. 3.ollege of Water Conservancy and Hydropower engineering,Hohai University,nanjing 2.0098,{3. State Key Laboratory of Hydrology-Water resources and Hydraulic engineering Hohai University Nanjing China national engineering {2. {3. 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

Detection of subcritical crack propagation for concrete dams

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Science china(Technological Sciences) 2009年第12期52卷 3654-3660页

作者： BAO TengFei1 ,2.YU Hong 1,2.1College of Water Conservancy&Hydropower engineering,Hohai University,nanjing 2.0098,{2. 2.3. engineering research center of Water resources Efficient utilization and engineering Safety,nanjing 2.0098,{2. College of Water Conservancy & Hydropower engineering Hohai University Nanjing China national engineering {2. {3. of Water resources Efficient utilization and engineering Safety Nanjing China

Subcritical propagation of cracks is a warning sign of *** such propagation is detected at an early stage,timely maintenance measures can be taken to prevent the failure of *** detect the subcritical propagation of a crack,the crack needs to be monitored continuously in a long term, which is not realistic under certain ***,cracks in concrete dams can be monitored continuously by dam monitoring to offer possible detection for subcritical *** this paper, with measured crack openings from dam monitoring,a state equation for characterizing crack development is established based on the grey system *** relation between the stability of the equation and the subcritical crack propagation is investigated,then a criterion is proposed for detecting subcritical *** example demonstrates the validity of the criterion and its potential for practical application.

关键词： crack subcritical propagation criterion concrete

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 HuaiZhi1,2.& GUO HaiQing1 1 College of Water Conservancy and Hydropower engineering, Hohai University, nanjing 2.0098,{2. {3. engineering research center of Water resources Efficient utilization and engineering Safety, nanjing 2.0098,{2. College of Water Conservancy and Hydropower engineering Hohai University Nanjing China national engineering {2. {3. of Water resources Efficient utilization and engineering Safety Nanjing 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

Establishing time-dependent model of deformation modulus caused by bedrock excavation rebound by inverse analysis method

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Science china(Technological Sciences) 2008年第S2期51卷 1-7页

作者： WU ZhongRu1,2.GU YanChang1,3.GU ChongShi1,2.GUO HaiQing1 & SU HuaiZhi1,2.1 Hohai University,nanjing 2.0098,{2. 2.national {3. research center of Water resources Efficient utilization and {3. Safety,nanjing 2.0098,{2. 3.nanjing Hydraulic research Institute,nanjing 2.002.,{2. Hohai University Nanjing China national engineering {2. {3. of Water resources Efficient utilization and engineering Safety Nanjing China nanjing Hydraulic research Institute Nanjing China

Rock rebound relaxation deformation,or even rock burst,caused by the excavation of dam base and abutment or high rock slope affects their stability and results in the fall of mechanical properties of the *** an inverse analysis method was proposed in this paper to establish the time-dependent model of deformation modulus caused by excavation *** basic principle is based on the combination of observed data of the excavation rebound deformation of dam abutment or rock slope,and the calculated rebound deformation by FEM under ground stress at the corresponding time in the excavation *** norm of the residuals of observed data and calculated data are taken as the objective ***,the time-dependent model of bedrock deformation modulus can be *** method displays its significance in the design of excavation,construction and operation management of dam base and high slope.

关键词： dam base rebound deformation modulus inverse analysis method time-dependent model Xiaowan Hydropower Station

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,{2. 2.0098,china {3. engineering research center of Water resources Efficient utilization and engineering Safety,{2. 2.0098,china 3.Department of Computer engineering,{2. Institute of Technology,{2. 2.0013.china College of Water Conservancy and Hydropower engineering Hohai University Nanjing China national engineering {2. {3. 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

Multivariate analysis in dam monitoring data with PCA

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Science china(Technological Sciences) 2010年第4期53卷 1088-1097页

作者： YU Hong1,2.WU ZhongRu1,2.BAO TengFei1,2.& ZHANG Lan1,2.1 State Key Laboratory of Hydrology-Water resources and Hydraulic engineering,Hohai University,{2. 2.0098,{3. 2.national engineering research center of Water resources Efficient utilization and engineering Safety,Hohai University,{2. 2.0098,{3. State Key Laboratory of Hydrology-Water resources and Hydraulic engineering Hohai University Nanjing China national engineering {2. {3. of Water resources Efficient utilization and engineering Safety Hohai University Nanjing China

Given the limitation of traditional univariate analysis method in processing the multicollinearity of dam monitoring data,this paper reconstructs the multivariate response variables by introducing principal component analysis(PCA) method,explores the ways of determining principal components(PCs),and extracts a few PCs that have major influence on data *** steady observation series,a control field for the whole observation values has been established based upon PCA;for unsteady observation series that have significant tendency,a control field for the future observation values has been constructed according to PC statistical predication *** methods have already been applied to an actual project and the results showed that data interpretation method with PCA can not only realize data reduction,lower data redundancy,and reduce noise and false alarm rate,but also be effective to data analysis,having a broad application prospect.

关键词： dam safety monitoring multivariate response variables principal component analysis data reduction

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 {2. and Hydraulic engineering,Hohai University,nanjing 2.0098,{3. 2.ollege of Water Conservancy Hydropower,Hohai University,nanjing 2.0098,{3. 3.6} engineering research center of Water {2. engineering Safety,Efficient {12. and nanjing 2.0098,{3. 4 nanjing Hydraulic research Institute,nanjing 2.002.,{3. State Key Laboratory of Hydrology-Water resources and Hydraulic engineering Hohai University Nanjing China College of Water Conservancy Hydropower Hohai University Nanjing China national engineering {2. {3. of Water resources engineering Safety Efficient Utilization and Nanjing Nanjing China nanjing Hydraulic research Institute Nanjing 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

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,WU ZhongRu1,2.& SU HuaiZhi1,2.1 College of Water Conservancy and Hydropower engineering,Hohai University,{2. 2.0098,china {3. engineering research center of Water resources Efficient utilization and engineering Safety,{2. 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 College of Water Conservancy and Hydropower engineering Hohai University Nanjing China national engineering {2. {3. of Water resources Efficient utilization and engineering Safety Nanjing China Yellow River Institute of Hydraulic research Zhengzhou China Embankment Security Defect Prevention and Control engineering research {2. of MWR Zhengzhou 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