Research On Key Technologies For Health Diagnosis Of Asphalt Concrete Core Wall Dam

The asphalt concrete core wall dam is a dam in recent decades,the use of gravel filling and rolling stone or pile and layered,compared with the traditional dam,it has the advantages of simple structure,convenient construction,short construction period,operation safety and other advantages,is currently very competitive and the application prospect of the type of dam.At the same time the type of dam is also promoted by the International Commission on Large Dams.Therefore,it is of great significance to study the health diagnosis of the asphalt concrete core wall rockfill dam in order to ensure the safe operation of the dam.In this paper,taking a typical asphalt concrete core wall rockfill dam as an example,the following research has been conducted on the health diagnosis technology of asphalt concrete core dams based on a number of key issues:(1)In order to objectively grasp the operating behavior of the asphalt concrete core wall rockfill dam,thereby guiding the construction of the project,feeding back the design and providing scientific evidence,it is necessary to set up corresponding monitoring facilities for the dam.This paper according to the characteristics of the asphalt concrete core wall dam structure,and system summarizes the dam safety monitoring contents,monitoring design principles,monitoring the methods of data analysis and monitoring apparatus note.(2)Asphalt concrete core wall dams in deep overburden stress is very complex,the stress and deformation of the dam and anti-seepage structure is quite complex,with the aid of the finite element numerical calculation method of advantage in solving complex structure boundary conditions,load transfer and nonlinear problems,the simulation on a reservoir of asphalt concrete core wall rockfill dam construction during the storage period and loading,on dam seepage and stress deformation of two-dimensional finite element analysis,it shows that seepage and stress deformation conform to the normal running state of earth rock dam.(3)Asphalt core wall is used as the main impervious body of the dam in asphalt concrete core wall dam,and the mechanical properties and deformation properties of asphalt concrete change with temperature and holding time.This paper has compiled the asphalt concrete core wall.The three-dimensional finite element calculation program for the temperature field and creep stress field of the structural analysis was used to calculate and analyze the temperature creep stress of an asphalt concrete core wall during the construction period and the impoundment period,it shows that the model can simulate the temperature and deformation of the core wall very well,and the deformation of the core wall is stable.(4)The monitoring data of a reservoir's asphalt concrete core wall d uring construction period are qualitatively and quantitatively analyzed by drawing method,eigenvalue comparison method and regression model statistics method.The finite element calculation results are compared with the actual monitoring results.The analysis shows that the rules of the two are basically consistent.There is a good consistency in time and space distribution.