工程地质三维建模及分析系统设计研究

STUDY ON 3D ENGINEERING GEOLOGY MODELING AND ANALYSIS SYSTEM DESIGN

采用边界表示(BRep)结构和TIN模型的混合数据结构,借助GIS技术,开发集基础数据管理和三维地质建模为一体的工程地质三维建模及分析系统。采用TIN模型来拟合构造复杂的地质曲面,提出包括直接由离散点生成TIN模型、或由地形等高线生成TIN模型,以及由规则格网数据生成TIN模型的多种构造方法,并实现地质层面TIN模型的求交、裁剪,以及缝合等关键技术;引入颜色、纹理等"渲染"技术,实现地质信息的逼真表达;此外,探讨基于三维地质模型的任意地质剖面分析、岩土体分布面积和体积计算等基本分析技术,最后将系统应用于滑坡、高边坡、水利水电以及公路边坡开挖等工程地质三维建模和分析中,验证该理论及系统的可靠性和通用性。

A 3D engineering geology modelling and analysis system is designed based on the complex data structure of boundary representation(Brep) and TIN,as well as the GIS technique. The TIN model is used to fit the stratum interfaces. A few methods to build TIN model are supposed,such as the discrete points converting from the contour line and the DEM model. The techniques of intersection,cutting and mending between the TIN model are also discussed. The geological information can be realistically represented by color and texture mapping. Furthermore,the analysis method based on the 3D geological model is presented,including generation of geological section,calculating area and volume of the stratum body. Finally,the 3D engineering geology modelling and analysis system is applied to simulate some projects,such as the coast,slope,hydraulic and hydroelectric project,and excavated highway slope. The results show that the theories and system have favourable reliability and practicability.