Finite Element Analysis Of Concrete Gravity Dam Based On Transverse Joint Contact

With the development and utilization of water resources and the construction and development of large-scale water conservancy and hydropower projects in recent decades,more and more new concrete gravity dams have emerged.For the newly-built concrete gravity dams,the study of their static and dynamic characteristics has certain reference significance for the design,reliability analysis and economic evaluation of the projects,etc.However,in the past,it has certain reference significance for gravity.In the analysis and discussion of dam structure,most of the finite element models are built according to through joints,that is to say,there is no mutual restriction between adjacent dam sections in the analysis process,but in practical engineering,when two adjacent dam sections contact each other,there is interaction between them,that is,contact between adjacent dam sections.In engineering practice,contact problem is a common,complex and typical non-linear problem.From the current classical mathematical and mechanical methods,its application has limitations,and it is difficult to solve most of the contact problems in theory.With the rapid development of computer technology,CAE,as a new numerical simulation and analysis technology,has attracted more and more attention of researchers.Researchers also use numerical methods to analyze it.This research uses this method to study the contact phenomena existing in the project from the perspective of hydraulic engineering.The research results of a concrete gravity dam are as follows:(1)A three-dimensional integral finite element model of a concrete gravity dam is established by using finite element numerical analysis software.Under normal water level,the stress-strain distribution law of typical dam sections is analyzed by comparing the calculation results of gravity dam considering contact characteristics and not considering contact characteristics.(2)For the distribution of stress and strain in typical dam sections: Generally speaking,the distribution of stress and strain in typical dam sections under the two models are basically similar,and they also conform to the basic law of gravity dam.In terms of stress,we get that the calculation model considering contact characteristics is better than that without considering contact characteristics in terms of force and transmission,and the distribution is more uniform.In terms of strain,we get that the calculation model considering contact characteristics is smaller than that without considering contact characteristics,which also shows that the calculation model considering contact characteristics is better in the analysis ofgravity dam structure.(3)On the basis of finite element analysis,the anti-sliding stability results of gravity dams are evaluated.Under the normal water level condition,the stability of typical dam sections in the two models are calculated respectively.The results show that the safety factors of typical dam sections under the two models meet the requirements of the code.It shows that the dam bodies of the two models are safe and reliable under the normal water level condition,and contact analysis is considered.The result of safety factor is larger than that without considering contact analysis.For the same spillway or retaining dam section,the total horizontal force and the total vertical force in two ways,the results of the finite element model considering contact characteristics are larger than those of the finite element model without considering contact characteristics.The results also show that the finite element contact model established by the research is reasonable.This paper takes the actual project as the research object,and the results of calculation and analysis provide reference for the design and safety research of the same type gravity dam structure.