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中文摘要：
在大规模的岩土工程建设中隧洞和洞室群是最为常见的地下结构。由于受岩土工程所处复杂地质条件的影响,针对地层和洞室的三维GIS综合建模及可视化分析是信息岩土工程面临的难题。讨论了基于栅格模型的地层三维建模技术,提出了由多层数字等高模型（DEM）生成三维地层的自适应控制算法。在此基础上,系统研究了地层中的三维洞室可视化仿真技术,提出了地层信息和洞室的三维综合建模技术,通过地下洞室的三维实体模型生成、洞室和地裙相减、洞室和地层相交等运算,实现了基于地层模型的洞室开挖与漫游,最终生成了赋含地层信息的三维洞室,并给出了一个典型的工程应用实例。
英文摘要：
During the construction of large scale geotechnical projects, tunnels and cavern groups are of the common underground structures. In recent years, the technologies of GIS and virtual reality have become very attractive in this research field. However, due to the effect of complex in situ geological condition and spatial modelling algorithms, it is still a difficult and important subject for three-dimensional synthetic model building and visualization analysis toward strata and cavern. A new technique to build stratigraphic model is discussed based on three-dimensional grid data, it results in an adaptive algorithm to build strata model by multi-DEM（digital elevation models）. Furthermore, the main subject of this paper related to simulation of three cavern excavated based on three-dimensional strata modeling is systematically discussed; through a series of complex algorithms such as three-dimensional entity model of cavern, subtraction of cavern and stratigraphic skirt, intersection between cavern and strata, the three-dimensional model of cavern including strata information is built finally. A typical case in relevant to a hydropower station is given at the end of this paper.
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