Study On True3D Numerical Simulation Of Deep And Large-scale Stope

Abstract:In recent years, numerical simulation, which is considered as an important researching method, has got a great achievement in parameters’optimization as well as stability analysis in the field of deep large-scale stope. However, there are2problems in simulation. The first one is the geometrical simplification; the second one is the simplification of force field.True3D finite element model, which agreed with the researching object in both geometry and mechanics, was built though technical improvement on existing numeral simulation. It was Visual Basic (VB) that was taken as the key to solve all the problems while several kinds of software were used in this paper. In this way, the calculating results became more reliable in deep large-scale stope simulating analysis. Researching results can be concluded as follow:(1) SURPAC-ANSYS interface program was complied. In order to take the advantage of SURPAC in ore body modeling and the advantage of ANSYS in numerical calculating at the same time, a bridge was built between them using VB. Compared with SURPAC-FLAC method, SURPAC-ANSYS solved the problems of mesh quantity controlling, nodes coupling and direct checking in preprocessing and preprocessing. It provided a new way to connect3D modeling software and numerical simulation software.(2) Initial stress field which matched the real situation was fit on the FEM of deep large-scale stope. In ANSYS, due to the imperfect function of initial stress field, it was impossible to create the ideal3D filed with gradient in every direction.IST files were processed by using APDL programing method and VB programing method, to create the ideal IST file. This file was fit on the FEM successfully.(3) The optimized numerical simulation method was applied in engineering practice. Xincheng gold mine was taken as an example to use the mentioned method in the simulation of deep and large-scale stope. The whole ore body’s FEM was modeled using SURPAC-ANSYS interface program. The3D-gradient initial stress field was created though VB method.(4) Several excavating schemes with different stope parameters were simulated. Stress components and displacement on different direction were considered as the most important indexes to analyze the stope stability. It was shown that the major failures were the roof falling and wall caving. The most optimal scheme and alternative schemes were selected. Some measures of avoiding the2mentioned accidents were presented.