Analysis On Static And Dynamic Characteristics Of Asphalt Concrete Core Wall Dam Of Momoke Water Control Project

Reasonable and moderate development and utilization of water resources can not only alleviate the shortage of resources,but also develop the local economy.Asphalt concrete core wall dam is an earth-rock dam,which can adapt to complex geological conditions.It has the advantages of high strength,good stability and convenient construction.It has been widely used at home and abroad.The dam type is composed of different partitions,including dam rockfill,transition layer and asphalt concrete core wall.Due to the different material properties of the dam body,different deformation and stress are generated under load.Therefore,it is of great significance to study its static and dynamic characteristics to ensure its safe operation.In this paper,the asphalt concrete core wall dam of Xinjiang Momoke Water Control Project is taken as the engineering background.Based on ABAQUS software,the three-dimensional nonlinear finite element analysis of the dam body is carried out,and the three-dimensional finite element model of the dam body is established.The static and dynamic characteristics of the project are analyzed.The main work and research results of this paper are as follows:(1)By consulting relevant data and literature,the basic theory used in the process of finite element numerical structure simulation is summarized.(2)The three-dimensional finite element model of asphalt concrete core wall dam is established by using ABAQUS finite element analysis software.The layered filling of the dam body is simulated.The Duncan-Chang E-B constitutive model is used in the static calculation.The displacement and stress distribution law of the dam body and the core wall under different working conditions,parameter sensitivity and the influence of different core wall thickness on the stress of the core wall are studied.The results show that the displacement values of the dam body and the core wall meet the specifications;the stress of dam body and core wall is mainly compressive stress;the tangent modulus coefficient K,failure ratio R_f and material cohesion c in Duncan-Chang E-B constitutive model parameters are high sensitivity parameters,and the tangent modulus index n and bulk modulus coefficient K_b are low sensitivity parameters.(3)On the basis of static calculation,the three-dimensional nonlinear dynamic finite element analysis of asphalt concrete core wall dam is carried out by using dynamic time history analysis method.The modal analysis,dynamic calculation result analysis and permanent deformation analysis of the dam are carried out.The results show that there is an obvious whiplash effect at the top of the earth-rock dam.Compared with the vertical dynamic displacement and acceleration,the dynamic displacement and acceleration along the river change greatly,and the dynamic displacement and acceleration along the river reach the maximum value first;the permanent deformation of earthquake is mainly reflected in settlement,and the proportion of permanent deformation along the river caused by water pressure is small.