The Numerical Simulation Analysis Of Replacing Concrete During Construction In Slotted Dam

With the time going on,the concrete dams grow aging and then there are many problems of the dam such as falling intensity of the concrete,seeping,cracking,the lower security and durability.So the systemic study on reinforcement of the old dams is popular in the worldwide field of hydraulic structure all along.At present,a new technique,forming inner wall to prevent seeping by replacing dam concrete,is introduced to rehabilitate old dams, based on which this paper discuss the problems above.Taking a concrete gravity dam in northeast of china for example,this paper discusses and analyzes the systematic safety problem for dam rehabilitation.During the analysis, general software,ANSYS,which has its own program,APDL,is used to model the process of construction.For the construction,the digging of the concrete destroys the field in the dam, and the hydration heat temperature rise of the fresh concrete also damages the field in the dam. Therefore it is significant to evaluate the new technique,forming inner wall to prevent seeping by replacing dam concrete.This paper analyzes in very great detail the longitudinal joints' influence upon the dam, and simulates the process of construction in detail.In the calculatian of temperature,some factors are taken into consideration including the longitudinal joints,the materials of different partitions,the different digging and pouting process of the concrete,the changing of the thermodynamic parameters,the time limit for the project.The result could be summarized as follows:because the area is relatively narrow,so the impact of the fresh concrete is not big, but the field of the temperature and stress in the dam is variational to a certain extent.Based on this rehabilitation technique of aging concrete dam,the results of this paper could be used as a theory not only to this engineering but also to other similar projects since it can predict the systematic safety of dam construction and provide effective reference for technique of construction.