| CAE technology provides a powerful auxiliary analysis method for engineering design.However,due to the tedious and complicated pre-processing work,CAE technology can carry out low-cost multi-scheme comparison,multi-parameter optimization,etc.The ability to provide optimal solutions for design is greatly reduced..Earth-rock dams are widely used in water conservancy dam projects around the world due to their unique advantages of excellent economy,strong adaptability,and short construction period,and they are also the preferred dam type for my country’s water conservancy dam construction.However,due to the complexity of its shape and material partitions,designers can only put forward a design scheme based on experience,and then perform finite element calculations to verify the feasibility and safety of the design scheme.It is difficult to conduct effective in-depth analysis of material parameters,shape parameters,etc..Therefore,how to simplify the pre-treatment process so that the CAE technology in the design process of the earth-rock dam can no longer only be used for verification,but actually plays the role of auxiliary analysis and scheme optimization in the design process,which is very meaningful work.Based on the collation and analysis of the existing actual engineering and the related code requirements of earth-rock dams,the dissertation clarified the main structural design factors that affect the numerical simulation of earth-rock dams,including dam slope,dam crest structure and dam body elevation.The analysis of structural characteristics puts forward a new idea of 3D parametric modeling of earth-rock dams.Based on the feature model technology of parametric design,the establishment of modeling rules is completed,and the 3D main body of the earth-rock dam is decomposed into multiple regular basic primitives,Taking the number of layers of the main dam body,the number of divisions,and the number of different layers of the cofferdam as parameters,the dam body coordinate data is collected according to the established numbering route,and the coordinate point control and the assembly rule of basic primitives are used to establish characteristic parameters and three-dimensional The connection between entities is similar to building blocks,so it is called the "Building block method".Use VB.NET to compile the interface program for reading coordinate data,and use ANSYS APDL secondary development to realize the parametric modeling of the three-dimensional earth-rock dam model,and realize the automatic division function.This method can efficiently and quickly establish a three-dimensional finite element model of the earth-rock dam,and accurately realize the division of different materials of the dam body.Since the modeling process utilizes the command flow function of ANSYS APDL,the time used for the entire modeling is basically the time consumed by the point coordinates.Taking the Lianghekou ultra-high core rockfill dam as an example,using the parametric modeling program of this article to establish a three-dimensional finite element model,the entire modeling process took only 10 hours,and the corresponding development of Duncan Zhang suitable for ANSYS The EB constitutive model,and then the numerical simulation calculation of the settlement of the Lianghekou core rockfill dam during the construction period verifies the validity of the model established by this method in the numerical simulation of actual engineering.Using the "building block method" proposed in this article,the three different slope ratios and three different seepage control schemes for homogeneous earth dams are given.A basic model is established to control the parameters and establish the limits of the corresponding nine different schemes.The meta-model verifies the advantages of this method in the application of multiple alternatives to earth-rock dams. |
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