Comparison of Parameters of E-B Model for Upper Reservoir Backfill Materials Determined by Stage Back-analysis in Jurong Pumped Storage Station
To predict the deformation of the dam body and reservoir basin of the Jurong Pumped Storage Power sta-tion during the completion period and after impoundment,the stage back-analysis were conducted to determine the pa-rameters of E-B model of the backfill materials in the upper reservoir by using the deformation data monitored during the construction period.Base on the back-analysis parameters in the third stage,the deformation characteristics of the dam and basin of upper reservoir after completion and impoundment were predicted.The results show that the back-analysis parameters obtained by using the deformation monitoring data in the early short-time period are comparatively large,while the parameters back analysis by using the deformation monitoring data with long-time duration decrease gradually to the true values.Introducing the initial stress state parameter S0 into the E-B model can reflect the over-consolidation characteristics of the in-situ compacted dam material,the larger the value of S0,the smaller dam deformation predicted.The value of S0 for backfill materials of dam after high strength compaction is between 0.40 and 0.55.For the settlement for the upper reservoir after completion,the predicted value by using the parameters obtained through the third stage back-a-nalysis agrees well with the monitoring value.The result of this study can be used to provide reference in the engineering.
over-consolidationstage back-analysisDuncan E-B modelhigh fill reservoir basinpumped-storage power station
万方数据
维普
