摘要
基于多层格网模型的表面建模方法,以及以此为基础形成的类三棱柱体元建模方法,要产生大量冗余的三角形面片或者细长的三棱柱单元,既不利于三维模型的快速浏览,也不能满足数值计算单元剖分的原则。采用TIN(不规则三角网)来表达地层面模型可以消除数据冗余。根据数据源的特点,实现了直接通过逐点插入法构造TIN模型,或者先通过Kriging插值法构造格网模型,再转化为TIN模型,以及利用等高线数据构造TIN模型。对TIN的裁剪算法进行了探讨,实现了地层面裁剪和断层的三维建模技术。借助可视化开发类库VTK,实现了三维地层模型的多种可视化表达方法。根据龙滩水电工程地质勘查情况,建立了坝址区域的三维地层模型。
The methods of 3D stratum modeling by multi-DEMs and triangular prisms can cause many redundant triangular-facets and slim triangular-prism meshes, so they aren＇t propitious to fast scan the 3D stratum model, or used for the numerical simulation meshes. The TIN model can adjust the area and amount of the triangular-facets, so it can avoid redundant data, when it is used to represented the stratum interface. The TIN model can be built by the incremental insertion algorithm with the discrete points, and converted from grid （generated by Kriging interpolation） by greedy insertion; and it also can be built by the topographic contours. The cutting method between TIN models is presented to implement Boolean operations for stratum interfaces and faults 3D modeling The multi representation methods are developed with the Visualization ToolKit; and the stratum body can be vividly represented by controlling the layer＇s color, texture and material. At last the 3D stratum model of Longtan Hydropower Station is built to validate the theories and programs.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第9期1954-1958,共5页
Rock and Soil Mechanics
