Meticulous Study On Stress Refinement Of Anti-seepage Body Of Earth-rockfill Dams Based On SBFEM

Since the 20 th century,the water resources and hydropower construction has entered a new period of rapid development.With the development of water resources,there is an urgent need to build a number of mega-projects.However,these projects have complex geological conditions and subjected extreme loads.The damage consequences and secondary disasters are incalculable.Therefore,it is particularly important to ensure the safety of high dams.The impervious body is the key part to ensure the safe operation of the dam,and it is also the weak link to induce dam damage,reasonable evaluation of its safety performance is very important to ensure the smooth operation of the dam.Fine analysis can more accurately locate the weak parts of the structure and provide more accurate reference and suggestions for disaster prevention measures.However,the traditional finite element method is limited in unit shape,it is difficult to achieve high-efficient fine modeling of the seepage control structure,and requires manual intervention,which is cumbersome and time-consuming.In this paper,adaptive mesh discretization technology(quadtree/octree)is used for efficient modeling,and the scaled boundary finite element method is used to solve complex elements which are difficult to calculate directly by traditional methods.(1)Firstly,the development history of different numerical simulation methods and the principle characteristics of proportional boundary finite element method are introduced,the advantages and disadvantages of different methods in solving complex elements are summarized.(2)The mechanical response of concrete asphalt core dam during construction period is simulated in detail,the distribution characteristics and numerical convergence law of the stress of concrete foundation varying with the grid density are studied,the recommended values of the grid size of the foundation are given,and discuss the engineering countermeasures to improve the stress of the foundation.The research results can provide reasonable suggestions for the safety evaluation of the dam seepage control system,as well as other types of dam seepage control system.The performance evaluation of similar projects can provide some experience for reference.(3)Using the generalized plastic model of soil,elastic-plastic contact model and plastic damage model of concrete,the dynamic response and damage evolution law of super-high concrete face dam under earthquake are studied,which can provide reference for the formulation of engineering safety precautions.(4)The safety performance of a high-core dam during construction and operation is studied.The stress distribution and influencing factors of the monitoring corridor in the core wall are analyzed and sorted out.According to the stress and deformation characteristics of the corridor,reasonable optimization measures are put forward for the project,which fills in the blank of the related research on the monitoring corridor in the core wall of the high-core dam and provides safety guarantee for the development of the High-dam reservoir.