Research On Safety Monitoring And Health Diagnosis Of Gravity Dam Based On Online Monitoring Data

This paper takes the on-line monitoring information of the concrete gravity dam of Shuikou Hydropower Station as the research object,aiming at the online monitoring data such as deformation,seepage,water pressure,temperature and precipitation of the nozzle concrete gravity dam,and using the statistical model in the traditional monitoring model to establish the deformation monitoring of the dam.The statistical model and dam seepage monitoring statistical model have studied the variation law and main influencing factors of dam deformation and seepage,and adopted the typical small probability method to determine the results of monitoring and monitoring indicators for the deformation and seepage safety of the concrete gravity dam at Shuikou Hydropower Station during the operation period;The Decision Making Trial and Evaluation Laboratory(DEMATEL)and the Analytic Hierarchy Process(AHP)theory,respectively,proposed a health diagnosis model based on AHP and a health diagnosis model based on AHP-DEMATEL.The related design and construction documents,on-line information,and operation management plans for the hydroelectric dam of the Shuikou hydropower station are based on the AHP and AHP-DEMATEL health diagnostic models,which are used to diagnose the health of the dam during the operation period of the Shuikou hydropower station and based on the two models.Indicator rights Distribution and health diagnosis to determine its current work behavior.The main research results obtained in this paper are as follows:(1)According to the multi-year on-line monitoring results of the Shuikou Concrete Gravity Dam,the data of the measuring points of the typical dam are selected,and the environmental measurement process line and the effect measurement process line are plotted,and the horizontal displacement and temperature related map vertical displacement and temperature are plotted.Figure,etc.,carried out statistics and correlation analysis of dam body deformation,seepage flow,upstream and downstream water level,and air temperature in the typical dam section of Shuikou Concrete Gravity Dam,and studied the changes of water level,temperature,and effect amount in the upper and lower reaches.The study shows that the peak displacement range of horizontal displacement and vertical displacement in the overflow section is larger in each dam section,the water draw section is next,and the water retaining section is relatively small;the vertical displacement and horizontal displacement values are obviously increased with the water level.The correlation between dam seepage and temperature changes is relatively high.In a temperature cycle,the value of the seepage flow in the low temperature period is relatively large and the value in the high temperature period is small.The increase in the reservoir water level will increase the measured value.(2)Based on the on-line monitoring data of deformation and seepage of the outlet concrete dam,the dam deformation monitoring statistical model and the dam seepage monitoring statistical model were established,and the fitting curves of horizontal displacement,vertical displacement,seepage,and fracture monitoring statistical models were plotted.Regression coefficient tables of statistical models,using charts to analyze the main factors affecting dam deformation and seepage,and study the law of variation and development trend of dam deformation and seepage.Using the typical small probability method and the statistical model parameters of deformation and seepage monitoring,the monitoring indicators of the deformation and seepage safety of the nozzle concrete gravity dam during operation were calculated.The results show that the temperature and time changes have a great influence on the displacement of the dam body,the opening degree of cracks and the fluctuation of seepage.The primary and secondary squares of the upstream water level have a significant influence on the effect quantity,and the temperature and rainfall have an effect on the displacement,crack opening,There is a certain lag in the influence of seepage flow.(3)Based on the theory of AHP and DEMATEL,the health diagnosis models of AHP and AHP-DEMATEL were established,the health diagnosis index system of Shuikou Concrete Gravity Dam was constructed,the health assessment set of Shuikou Dam was designed,and the health of AHP and AHP-DEMATEL was used.The diagnostic model diagnoses the health status of the current nozzle concrete gravity dam.The results show that the health status of Shuikou Concrete Gravity Dam obtained by the two diagnostic models is basically normal.(4)The problem of dam health diagnosis is a complex issue that needs to consider a series of diagnostic indicators.Study the differences in the process and results of the study of dam health using different methods.To this end,hydropower dams were investigated based on the AHP and AHP-DEMATEL diagnostic theories,respectively.Analyze the changes in weights of health indicators and differences in health outcomes resulting from the use of different diagnostic methods.The results showed that the health outcomes of Shuikou Concrete Gravity Dam,which was diagnosed by the two methods,were basically consistent,and all indicated that the dam was in a normal normal state of health.In the weight distribution of AHP health diagnosis model,the proportion of the weight of the project quality and structure accounted for a high proportion;in the weight distribution of the AHP-DEMATEL health diagnosis model,the weights accounted for relatively high were structural health and seepage health,indicating the adoption of AHP-DEMATEL.The weighting system determined by the health model can better consider the interaction between superiors and peers.In summary,this paper establishes the monitoring model of displacement and seepage of concrete gravity dams,studies the development trend of the change law of the effect quantity,establishes the AHP-DEMATEL health diagnosis model,and conducts health diagnosis of outlet concrete dams,and studies the large water outlets.The health status and important diagnostic indicators of dams provide important reference for the analysis of other dam monitoring information,research of dam monitoring data and health status,and establishment of a dam intelligent diagnosis system.