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目前基于野外地质调查数据自动、快速地建立区域三维地质体模型是中国全面开展三维数字地质填图的迫切需求。本文基于产状、地质界线与路线剖面等野外区域地质调查要素,提出了一种二维平面地质图及路线剖面图向三维地质体模型的快速转换方法。该方法针对无剖面约束及含剖面约束2种情形,通过地质界线区域分割、多段线仿射变换等空间几何变换处理,推估出剖面线约束的地下地质界线,基于Coons曲面构建出地质体的侧面模型;然后,通过约束三角网算法构建地质体的顶、底面模型,最终建立拓扑一致的区域地质体三维模型。基于此方法,对中国1:2.5万区域地质调查试点区域进行了区域三维地质建模实践,实现了火山口、地层、岩体、断层等典型地质构造的快速三维重建。
At present, the automatic and rapid establishment of regional 3D geological model based on the field geological survey data is an urgent need for the full implementation of 3D digital geological mapping in China. In this paper, based on the geological survey elements in the field, such as yield, geological boundary and route profile, a fast method of 2D geological mapping and route profile to 3D geological model is proposed. Aiming at the two kinds of cases without cross-section constraint and cross-section constraint, this method estimates the underground geological boundary line constrained by the segmentation of geological boundary and the affine transformation of multi-section line, constructs the geological body based on Coons surface Then, the top and bottom models of the geological body are constructed by constrained triangulation algorithm, finally the topological and consistent three-dimensional model of the regional geological body is established. Based on this method, a 3-D regional geological modeling practice was carried out in the 1: 25000 regional geological survey pilot area in China, realizing the rapid 3D reconstruction of typical geological formations such as crater, stratum, rock mass and fault.