Contour-based 3D Discrete Element Method Numerical Modeling Method for Complicated Terrain

Abstract

The present invention provides a modeling method for 3D discrete element method numerical model of complicated terrain based on contour line, and belongs to numerical simulation research fields in geological engineering and mining engineering fields. The method comprises: firstly, acquiring a digital topographic map of a modeling area, encrypting elevation points at a boundary of the area and an area with sparse elevation points and obtaining elevation values of each encrypted elevation point, and extracting 3D spatial information of each elevation point and saving the information; then performing surface spline interpolation on the digital topographic map, and drawing a modeling area surface 3D graphics; inputting the 3D spatial information of all the elevation points after surface splineinterpolation into a final terrain data file, and establishing a 3D numerical model by 3D discrete element method software; and by comparison and verification with the surface 3D graphics, obtaininga final 3D discrete element method numerical model of the modeling area. According to the method, high-precision numerical modeling can be performed on any complicated terrain area, and the established model surface has smaller deviation than the actual terrain surface, and the method has higher application value.

Description

technical field [0001] The invention belongs to the research field of numerical simulation in the fields of geological engineering and mining engineering, and in particular relates to a contour-based three-dimensional discrete element method (3DEC) numerical model modeling method for complex terrain. Background technique [0002] Topography and landform are important basic elements that need to be represented on ordinary maps. They are usually also called terrain or topography, specifically referring to the ups and downs of the surface. There are many ways to represent terrain on the map, such as scene description method, shading method, layered coloring method and contour line method. Among them, the contour line method is the most commonly used and has the highest representation accuracy. Its basic principle is: connect points with equal ground elevations into a smooth curve and project it onto the plane. Contour lines have many uses in actual engineering construction, su...

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Problems solved by technology

Since not all terrains can be described in the form of surface equations, the method proposed by Dr. Yin is more suitable for areas with less complex terrains, but for mountainous areas with complex terrains, this method has certain limitations However, the modeling accuracy will be greatly reduced, and it is difficult to meet the requirements of high-precision numerical simulation calculations. In addition, this method has a large amount of data processing workload in the early stage, and the actual operation process is also relatively complicated.

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