Three-dimensional Static And Dynamic Stability Analysis Of Tailings Dam

As a special hydraulic structure,tailings dam is an important public welfare infrastructure related to the national economy and people’s livelihood,and its stability research is very important.With the rapid development of computer technology,numerical calculation methods have gradually become the mainstream of the stability analysis of tailings dams,in which the finite element method has been widely used.In the finite element calculation and analysis of the static and dynamic stability of the tailings dam,how to establish a complete,accurate and intuitive finite element calculation model is an important research direction of numerical simulation analysis.Therefore,the advantages of CATIA,HYPERMESH and ABAQUS are optimally combined by the integration method,and the finite element method is used to calculate and analyze the 3D static and dynamic stability of tailings dam,which provides a new idea for the numerical simulation study of the stability of tailings dam,and provides technical support for the safe operation and management of tailings dam.Specific research contents and results are as follows:(1)Use CATIA software to establish a 3D geometric model of tailings dam.The 3D geometric model of the tailings dam is established by CATIA software,including geological model,starter dam and embankment.The key technologies of 3D modeling of tailings dam are studied,including the establishment of geological model,and the specific operation process is given.The results show that the 3D modeling technology takes into account the influence of the topography of the tailings reservoir and the structural characteristics of the tailings dam,which makes the boundary conditions of the tailings dam more realistic and enhances the integrity and accuracy of the model.(2)HYPERMESH is used to divide the finite element mesh of tailings dam.Geometry clean-up and 3D meshing of tailing dam by HYPERMESH software.The key technologies for geometry clean-up and meshing in different material property areas are studied,and the specific operation process is given.Finally,export the INP file,which is the model data.The results show that the meshing technology fully satisfies the high-quality meshing of the complex structure of the tailings dam,which not only improves the convergence of the calculation,but also guarantees the reliability and rationality of the calculation results.(3)Analysis of static stability of the tailings dam.The static calculation uses the finite element strength reduction method,implemented by the Mohr-Coulomb model,and writes the history data of the corresponding INP file,and finally input the complete INP file into the ABAQUS software for solution.First,initial geo-stress equilibrium of the geological model is carried out,and then analyze the stress field,displacement field and plastic flow changes of the tailings dam.The results show that the characteristics of the reverse surging of the displacement along the downstream direction,the transverse displacement has the characteristic of deformation towards the middle area of the tailings dam,and the vertical displacement is stratifiedly distributed from the upper to the lower;the gravity effect of the tailings dam is obvious;The starter dam plays an important role in blocking the plastic expansion of the embankment.(4)Analysis of dynamic response of the tailings dam.The dynamic calculation adopts the time-history analysis method,implemented by the equivalent linear model,then writes the history data of the corresponding INP file.Finally,input the complete INP file into the ABAQUS software for solution to analyze the stress field,displacement field and acceleration response of the tailings dam.The results show that the displacement of the tailings dam has the characteristics of deformation distribution with greater in the middle and less in both side and larger at the upper and smaller at the lower;there is no tensile stress damage in the tailings dam;the acceleration response of the tailings dam increases along with the increase of the height of the dam,and the maximum acceleration values is on the slope surface of the dam.