Inversion and Sensitivity Analysis of Permeability Coefficient of the Main Zones of A Concrete Face Rockfill Dam
Parameter inversion is a common method to determine the reasonable permeability coefficients of materials in engineering seepage analysis.However,for projects such as face rockfill dams with many material partitions,if the in-version of the permeability coefficients of all partitions is performed,the inversion efficiency and precision will be re-duced.In order to solve the above problems,taking a face rockfill dam project as an example,a three-dimensional finite element seepage analysis model was established.By designing orthogonal experiments with 5 factors and 3 levels,and u-sing the head values of the measuring points as the analysis indexes,the sensitivity analysis of the material permeability coefficient of each partition to the seepage field was carried out,and finally the material partitions that have a greater im-pact on the seepage field were identified.The ELM-GA algorithm was used to invert the material permeability coefficients of those partitions.The results show that the maximum relative error between the calculated value of the measuring point and the measured value is only 2.2% ,and the obtained permeability coefficients can be used for the calculation and analy-sis of seepage in the dam site area.The research results can provide reference for similar projects.
concrete face rockfill dampermeability coefficientsensitivity analysisparameter inversionorthogonal experiment
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维普
