基于三维激光扫描技术的复杂三维地质体建模方法

发布时间：2018-01-29 18:09

本文关键词： 三维激光扫描复杂地质建模前处理 FLAC~(D)　出处：《工程地质学报》2017年01期 　论文类型：期刊论文

【摘要】：FLAC~(3D)平台下前处理阶段复杂地质体三维数值计算模型的建立一直是岩土工程数值模拟工作者面临的难题,而三维激光扫描技术在获取复杂物体的精细空间数据的方面具有独特的优势。因此,本文提出以逆向工程为过渡平台实现复杂三维地质体FLAC~(3D)数值模型的构建。利用三维激光扫描技术精细几何数据的获取功能,对复杂三维地质体空间形状几何信息进行提取;利用Geomagic Studio良好的点云数据处理及曲面建模功能,准确地重构了复杂地质体的CAD曲面模型;利用Hypermesh强大的几何处理能力及网格划分能力,将复杂地质体的CAD曲面模型进行实体化和网格化;最后由FLAC3D软件内嵌的Fish语言编制的文件转换为FLAC3D能够识别的文件格式,从而实现了该软件前处理过程中复杂三维地质模型的高效、精准的建立。结合工程实例,对该方法的可行性与仿真效果进行了检验。结果表明该方法具有方便、快捷、合理且实用性强的优点。
[Abstract]:It has been a difficult problem for geotechnical engineering numerical simulation workers to establish 3D numerical model of complex geological body in pre-processing stage on the platform of FLACU / 3D. Three-dimensional laser scanning technology has a unique advantage in obtaining fine spatial data of complex objects. In this paper, using reverse engineering as a transition platform, a numerical model of complex 3D geological body (FLACU) is constructed, and the function of obtaining fine geometric data by using 3D laser scanning technique is presented. The geometry information of spatial shape of complex 3D geological body is extracted. Using the good point cloud data processing and surface modeling function of Geomagic Studio, the CAD surface model of complex geological body is reconstructed accurately. The CAD surface model of complex geological body is materialized and meshed by using the powerful geometric processing ability and mesh generation ability of Hypermesh. Finally, the file compiled by Fish language embedded in FLAC3D software is converted into a file format that can be recognized by FLAC3D, thus realizing the high efficiency of complex 3D geological model in the pre-processing process of the software. The feasibility and simulation results of this method are verified by an engineering example. The results show that the method has the advantages of convenience, rapidity, reasonableness and practicability.
【作者单位】：中国科学院地质与地球物理研究所中国科学院页岩气与地质工程重点实验室;中国科学院大学;
【基金】：国家自然科学基金项目(41172269,41372322)资助
【分类号】：P642
【正文快照】： 0引言工程地质体的稳定性分析通常是一个复杂的地质力学问题,它需要地质工作者在现场调查、测量、分析的基础上,建立相应的物理力学模型。进而采用一定的理论与方法,辅以虚拟数值模拟试验,预演、再现工程地质体的灾害演化过程。通过这种地质-数学-力学的分析手段,以达到解决实

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