滑坡体三维地质建模与可视化分析

针对滑坡地质研究的自身特点,提出了面向滑坡地质体三维建模的NURBS-BRep混合数据结构和地质结构单元实体构造技术.通过对滑坡基础地质数据的预处理、滑坡数字地形和滑动面的三维建模、地质结构面的系统构造、地质结构体的生成和显示,形成了一套完整的滑坡三维地质模型的构建方法.将该方法应用于某水库滑坡,建立了相应的三维滑坡地质模型,并基于此模型进行了三维剖切分析、数字钻孔、等值线生成、滑块自动剖分、滑坡失稳可视化动态模拟和滑坡体方量精确计算等一系列实用的可视化分析,为滑坡稳定性的准确计算和客观评价提供了有力的支持.

3-D geological modeling and visual analysis of landslide mass

According to the features of geologic research for landslide, the NURBS-BRep hybrid data structure was put forward to meet the needs of 3-D landslide geological modeling. Then, the corresponding constructional model of geological structural blocks was established. Based on these techniques, a set of integrated 3-D modeling method was advanced for landslide geologic bodies. It included four sections: the pretreatment for basic geological data of landslide, the 3-D modeling of landslide digital terrain and sliding surface, the system construction of geological structural surfaces, the generation and representation of geological structural bodies. This method was applied to a landslide in reservoir area successfully. Based on the established actual 3-D landslide geological model, a series of practical visual analyses proceeded. They contained arbitrary 3-D section analysis, digital drill, contour lines generation, automatic subdivision of slide blocks, visual dynamic simulation of landslide instability and accurate volume computation of landslide mass. These results can offer powerful supports to exact calculation and objective evaluation of landslide stability.