Abstract:

Accurate geological model is determinant to the stability numerical analysis reliability of open-pit slope engineering.Due to the complexity and irregularity of intersections between geological bodies，the authors study the generation technology of free-form surface based on NURBS （Non-Uniform Rational B-Spline）.Taking 2D geological exploration sections which are widely adopted in mining engineering as basic data and processing them by means of vectorization，the discrete points on the boundary of rock and soil mass are extracted，and then NURBS demarcation surfaces between geological bodies are built.Based on that，the corresponding implementing scheme of 3D visualization and numerical model of complicated geological structure in slope engineering on the platform of MIDAS software is made.The modeling method mentioned above is applied to the slope engineering of Chengmenshan open-pit mine in Jiangxi Province as an example.Practice shows that the method building complicated geological body model of slope engineering by using NURBS technology is simple and reliable and could greatly improve the model precision and modeling efficiency，not only representing the complicated geological bodies vividly，but also providing reliable finite element numerical model for the stability analysis of open-pit slope engineering.

Key words: NURBS, slope engineering, complicated geological structure, 3D visualization, numerical model, MIDAS software, NURBS, slope engineering, complicated geological structure, 3D visualization, numerical model, MIDAS software