不规则柱状节理网络随机模拟方法研究

Study on a Method for Random Simulation of Irregular Columnar Joints Network

现场调研发现,不规则柱状节理岩体柱列横截面为不同边数多边形镶嵌组合图形。为了生成不规则柱状节理网络,基于voronoi图生成原理建立了不规则柱状节理岩体柱列横截面镶嵌组合图形的随机模拟方法,即:先将不规则柱状节理岩体区域假设为矩形区域,确定该矩形区域的范围,然后在该区域内采用随机函数生成一定数量的随机点,通过控制镶嵌组合图形不同边数多边形的比例对随机点进行筛选,得到生成voronoi图所需数据点,然后采用delaunay三角剖分算法生成voronoi图,即为所需不规则柱状节理岩体柱列横截面镶嵌组合图形,再在CAD软件中对该镶嵌组合图形进行编辑处理,即可得到不规则柱状节理网络三维模型,可为后续3D打印柱状节理网络实体模型和建立不规则柱状节理网络数值计算几何模型提供支撑。最后,以Giant’s Causeway典型柱状节理岩体为例进行其柱列横截面镶嵌组合图形随机模拟,初步验证了上述方法的可靠性。

In field investigations,it has found that the cross section of irregular columnar jointed rock mass is a mosaic pattern composed of a series of polygons with different number of edges. Herein,for the sake of generating irregular columnar joints network,a method for random simulation of the mosaic pattern of the cross section of irregular columnar jointed rock masses was introduced as follow: firstly,the irregular distribution area of columnar jointed rock masses was assumed to be a rectangular area,of which the range was determined;secondly,a number of random points were generated in the rectangular area by a random function and were screened by controlling the proportion of polygons with different edges in the mosaic pattern,then the screened data points were used to generate voronoi diagram representing the cross section of columnar jointed rock masses by Delaunay triangulation algorithm.Then the voronoi diagram was edited in CAD software to obtain irregular columnar jointed rock masses 3 D model,which can provide support for subsequent researches on irregular columnar jointed rock masses 3 D printing technology and numerical simulations. Finally,taking Giant ’s Causeway columnar jointed rock mass as an example,its cross section was generated by the above random simulation method,which has verified the reliability of the method.