Deep Fusion Method of Geological and Structural Models Based on BIM Technology
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摘要: 三维地质建模技术和基于BIM的结构建模技术在各自领域发展迅猛,但是两者在数据来源、建模方式以及信息表达等方面存在显著的差异,目前两类模型主要表现为在空间上叠加,始终难以很好地深度融合.以岩土工程中的地质体和结构体为研究对象,对两类模型进行布尔运算,通过平面回路搜索和空间回路分析,建立三维地质模型和BIM结构模型的深度融合方法.记录地质体模型和结构体模型的重叠关系,对可能重叠的地质体模型和结构体模型进行面—面之间的重叠和相交的布尔运算;基于递归算法,对面上的线段进行共线识别,记录新的顶点、线、面的信息;通过平面回路搜索,在平面上建立新的顶点—有向边—有向环—有向面的几何拓扑关系;通过空间回路分析,在空间上形成有向面—有向壳—有向体的几何拓扑关系,实现地质体和结构体的几何拓扑重构,从而真正实现地质体与结构体的深度融合.结合三维模型力学分析需求,实现了深度融合的一体化模型与力学分析模型的转换,进一步验证该方法的有效性和适用性.Abstract: Although both three-dimensional (3D) geological modeling technology and building information modeling (BIM) based structural modeling technology have advanced quickly in their respective fields,there are considerable variations between them in terms of data sources,modeling techniques,and information expression.At present,the two types of models are mainly superimposed in space,and it is always difficult to integrate well.Taking geological bodies and structural bodies in geotechnical engineering as research objects,Boolean operations were applied to the two types of models,and finally a deep fusion method of 3D geological model and BIM structural model was established through plane loop search and spatial loop analysis.The overlapping relationship between geological model and structural model was recorded,and Boolean operation between the surfaces was carried out for the geological model and structural model.Based on recursive algorithm,collinear recognition was performed for line segments on the face,and new vertex,line and face information were recorded.Through plane loop search,new geometric topological relations of vertices,directed edges,directed rings and directed faces were established on the plane.The geometric topological relationship of directional surface,directional shell and directional body was formed in space by means of spatial loop analysis,and then the geometric topology reconstruction of geological and structure model was realized,so as to truly realize the deep integration of geological model and structural model.Combined with the mechanical analysis requirements,the conversion of the deeply integrated model and the mechanical analysis model was realized,which further verifies the validity and applicability of this technology.
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