Research On Back Analysis Of Rheological Parameters Of Asphalt Concrete Core Dam

The necessity of using numerical methods to analyze the shape of dams for simulation calculations has been recognized by the water conservancy community in my country,especially after the finite element method is available,it has once again set off a research boom.The appropriateness of the mathematical model and the correctness of the mechanical parameters directly affect the accuracy and reliability of the numerical calculation.The mechanical properties of filling materials for core earth-rock dams are relatively complex,and the results of numerical calculations using indoor experimental parameter values are often different from the actual working behavior of the dam measured.In order to understand the real working behavior of the dam,this paper uses the monitoring data to perform parameter inversion analysis on the core dam to obtain the real model parameters of the dam,which has positive theoretical significance for the related research and application of the core dam.And realistic engineering meaning.The main research contents of this article are as follows:（1）After reading a large number of documents,a brief analysis of the construction status of earth-rock dams,the research status of rheological problems,and the research status of geotechnical engineering inversion analysis were carried out.On this basis,the rheological parameter inversion analysis of asphalt concrete core wall dams was proposed.problem.（2）The research on the rheological deformation mechanism of earth-rock dams was carried out,and the entire rheological process of soil and rockfill was explained in detail.Two major types of rheological constitutive models,element models and empirical models,are introduced from the aspects of formation methods and respective classifications,and the advantages and disadvantages of these two major types of models are analyzed.Zhu Sheng’s seven-parameter model is selected as the empirical model for this article.Rheological constitutive model.（3）There are many types of inversion optimization algorithms,and the classification standards are also different.This article briefly describes various intelligent inversion methods such as genetic algorithms,artificial neural network optimization algorithms,and ant colony algorithms that are commonly used in the geotechnical engineering community.The basic idea and parameter selection of the particle swarm algorithm are introduced,and finally the single-group adaptive particle swarm algorithm is selected as the inversion method of this article.（4）The large-scale finite element calculation software ABAQUS is briefly introduced.Based on the orthogonal experiment theory,the rheological parameters in the Zhu Sheng seven parameter model are analyzed with the aid of the ABAQUS software.Three sensitive parameters c、α、n₃ are selected as the inversion target parameters,which improves the efficiency of inversion calculation.（5）Finally,relying on the Gaodongzi core wall dam,the monitoring data was sorted out and analyzed,and a more reasonable monitoring settlement value was used to carry out three-dimensional finite element inversion calculations for the upstream and downstream gravel areas,and the inversion results were compared with the measured settlement values.The comparative analysis has verified the reliability of the inversion parameters.（6）On the basis of the above work,the behavior of the dam body before the high-dongzi core wall dam is lowered for impoundment and the dam is maintained at a normal impounding level in a stable operation condition is predicted.