万家口水电站复杂地质体三维模型及其数值模型构建

水电工程地质项目中,复杂地质体的三维模型及其数值模型的构建是关键.结合GOCAD软件在复杂地质体建模上的强大优势,针对数值模拟软件ABAQUS在构建及单元网格划分等前处理问题上存在的缺陷,在研究三维地质建模主要问题的基础上,提出了基于离散光滑插值方法的复杂地质体三维可视化及其数值模型构建技术.利用GOCAD建立的三维地质可视化模型,通过二次开发,成功转换为ABAQUS数值模型,并将该技术应用于万家口水电站的坝肩稳定分析中.结果表明,该方法可以为水电工程设计及其岩土工程数值模拟提供新的途径.     

MIDAS/GTS FLAC3D耦合建模新方法及其应用

针对FLAC^3D面向复杂地质体与结构工程前处理建模存在的技术困难与不足,提出MIDAS／GTS—FLAC^3D耦合建模新方法。即先利用MIDAs／GTS进行三维几何建模和网格划分,然后,基于对两类软件中单元、节点数据关系的差异分析,应用MATLAB编写MIDAS／GTS—FLAC^3D接口程序,实现了MIDAs／GTS环境下建模的单元、节点信息导入FLAC^3D的数据转换。通过下伏采空区矾水沟大桥一师婆沟隧道复杂工程建模实例,验证了MIDAS／GTS-FLAC^3D耦合建模方法的可行性和有效性,为FLAC^3D构建三维复杂工程模型提供了新的思路。     

CATIA-FLAC 3D耦合建模方法及其应用

针对FLAC3D面向复杂的地质模型建模存在的技术困难和不足,提出CATIA-FLAC3D耦合建模新方法.先利用CATIA强大的三维地质体建模功能进行三维地质建模,再利用其有限元模块对地质体进行网格划分;基于对两类软件中单元、节点数据关系的差异分析,应用Visual Basic语言编写CATIA-FLAC3D接口程序,实现了将CATIA环境下建模生成的单元、节点信息导入FLAC3D.以某已建成偏压隧道工程为例,验证了CATIA-FLAC3D耦合建模方法的可行性和有效性,为FLAC3D构建三维复杂工程模型提供了新的思路.     

水利水电工程3维地质建模系统一体化设计

针对水利水电三维地质建模软件在地质信息数据库与建模系统分离的弱点,提出结合三维地质数据库与三维建模软件交互设计的方法,并在CATIA软件上开发了适用于水利水电工程的三维地质建模平台。利用Microsoft SQL 8.0软件建立了三维地质建模数据库,能实现数据录入、查询、删除、EXCEL模版导入导出等功能,利用Visual Basic.net软件搭建了三维地质建模平台,包括三维地质建模中所需的覆盖层、地质层、水文层、模型分析等基本模块,并将三维地质建模数据库嵌入到三维地质建模平台中,实现钻孔数据导入、虚拟钻孔、以及三维地质模型的任意剖切出图等功能。实现了三维地质建模数据库与三维建模平台一体化的设计理念。     

三维地质建模及其在水利水电工程中的应用

三维地质建模软件是计算机技术在地质中应用的重点和发展方向,它将大量地质资料和地质人员分析判断结果抽象为可视化的地质模型,使复杂的空间关系可视化,通过对模型的旋转,从不同的角度观看模型,形象直观,它充分利用计算机管理和分析的手段,将数据的输入、规模指数的计算、模型测算、成果输出综合为一个数据流,实现了全数字化信息处理,为快速、有效、准确地进行水利水电工程提供良好的现代化工具。本文以GeoEngine软件为建模工具,介绍了三维地质建模的过程以及模型的可视化方法。     

基于SketchUp构建虚拟景观的方法研究

SketchUp软件简便易学,可迅速构建、显示、编辑三维模型,避免了其他三维设计软件的复杂性,且生成的模型简洁、精细,因此基于SketchUp软件,研究快速、高效、低成本地构建虚拟景观的方法,提出几何建模的技术方案,对几何建模和纹理映射的方法进行详尽地分析并重点介绍它们实现的方法,为减少三维模型数据量提出一些模型优化处理的相关方法,以北京建筑工程学院虚拟校园建设为实例,验证方法切实可行.     

油藏体数模综合展示技术研究

为扩展用户业务数据的展示,综合分析油藏体的地质结构以及油水分布情况,研究复杂三维地层油藏数值模拟可视化实现过程中的关键技术,先分析现有数模软件输出文件格式,结合用户特定业务数据,应用Pillar模型构建三维地层模型,再使用Open Inventor三维图像开发平台完成3D展示,在此基础上实现三维模型网格筛选、切片、色谱自定义等人机交互功能,提供油藏体数值模拟综合展示功能。     

基于VTK的三维地震建模方法研究

在三维地震波动方程模拟或射线追踪正演研究与应用中,需要构建复杂的三维地震模型,因此,研究复杂地震模型的计算机建模方法是必要的。本文提出了采用基本几何形体及形体间的布尔运算来构建复杂模型的思想与方法,并在VTK可视化工具包和MFC开发平台的基础上,对该方法进行了算法与软件实现。应用设计的软件进行了建模实验,结果表明该方法用于地震建模是完全可行的,并大幅度地提高了地震建模的效率。     

地质模型合并方法在前期研究中的应用

在地质建模的过程中，受地质条件、特征的限制，建立一个整体模型非常困难，尤其在研究时间有限时，需要先建立独立模型加快研究速度后再合并为整体模型进行研究。通过ECLIPSE数值模拟软件的模型合并方法，可非常方便的把多个独立的模型合并为一个整体模型，降低了复杂断块或多砂体油气藏地质建模的难度，提高了工作效率。     

基于离散光滑理论的高精度三维模型构建方法

三维建模包括地表和地下空间两个方面,模型精度不仅是评定建模性能的重要指标,更是工程方案比选和工程预算的重要依据.在综合分析多种三维建模方法的基础上,提出了一种基于离散光滑理论的高精度三维地质体高精度建模方法,通过综合利用测量、钻孔、物探等数据及其相互间的相关性,对地质体对象进行联合建模.利用原始钻孔数据的某一类地层进行插值,计算得到原始钻孔数据与插值拟合结果之间的几种残差,并进行分析比较,进而得到各地质区域的构造模拟结果及其置信区间.利用某水电工程中的测绘和地质的实际数据进行了实验验证,从结果来看,该方法不仅能更高精度地拟合出三维地表模型,而且能构建复杂的地质构造,辅助工程勘察设计、岩土计算等应用.     

Application of 3D Visual Techniques in Daliuta Coal Mine

3D visualization is one of major problems in ＂Digital Mine＂ theory and its technological research field. Through the observation of 3D geological models, spatial structural information, connected with the information of production management hidden in geological data, could be detected. In order to meet the requirement of more efficient coal exploration, a case study of geological characters of the Daliuta Coal Mine is presented in which 3D visual models of the ground surface and geologic bodies are established on the basis of data models and data structures of 3D geology modeling. The main conclusions of this study are as follows： （1） Through analysis and organization of spatial discrete data, the drillhole database is designed with the data of the Daliuta mine; the connections amomg drillhole data are realized and displayed in a 3D environment. （2） Combining real data of the Daliuta mine, drillhole visualization is realized in a 3D environment by using the CoalMiner system. （3） The ground surface modeling of the Daliuta coal mine adopted a surface-data model and a TIN data structure. （4） 3D models of coal seams and rock formations of the Daliuta mine are established, which provide a method for the simulation of complex surfaces of geologic bodies. In the end, the models are applied to the Daliuta coal mine and the result shows that better geological effects are obtained.     

Framework system and research flow of uncertainty in 3D geological structure models

Uncertainty in 3D geological structure models has become a bottleneck that restricts the development and application of 3D geological modeling.In order to solve this problem during periods of accuracy assessment,error detection and dynamic correction in 3D geological structure models,we have reviewed the current situation and development trends in 3D geological modeling.The main context of uncertainty in 3D geological structure models is discussed.Major research issues and a general framework system of uncertainty in 3D geological structure models are proposed.We have described in detail the integration of development practices of 3D geological modeling systems,as well as the implementation process for uncertainty evaluation in 3D geological structure models.This study has laid the basis to build theoretical and methodological systems for accuracy assessment and error correction in 3D geological models and can assist in improving 3D modeling techniques under complex geological conditions,     

Probe into Key Techniques of Regional-Oriented 3D GIS

1 Introduction Geological exploration is one of the most im- portant approaches to study and solve multitudinous geological problems in the development of modern times. Since 1990s, geological work has been con- fronted with a new opportunity that is brought by the rapid development and extensive application of in- formation technology all over the world. It becomes a new working model for studies based on digital spa- tial database, computer cartography and Geographi- cal Information System …     

An Approach to Computer Modeling of Geological Faults in 3D and an Application

3D geological modeling, one of the most important applications in geosciences of 3D GIS, forms the basis and is a prerequisite for visualized representation and analysis of 3D geological data. Computer modeling of geological faults in 3D is currently a topical research area. Structural modeling techniques of complex geological entities containing reverse faults are discussed and a series of approaches are proposed. The geological concepts involved in computer modeling and visualization of geological fault in 3D are explained, the type of data of geological faults based on geological exploration is analyzed, and a normative database format for geological faults is designed. Two kinds of modeling approaches for faults are compared： a modeling technique of faults based on stratum recovery and a modeling technique of faults based on interpolation in subareas. A novel approach, called the Unified Modeling Technique for stratum and fault, is presented to solve the puzzling problems of reverse faults, syn-sedimentary faults and faults terminated within geological models. A case study of a fault model of bed rock in the Beijing Olympic Green District is presented in order to show the practical result of this method. The principle and the process of computer modeling of geological faults in 3D are discussed and a series of applied technical proposals established. It strengthens our profound comprehension of geological phenomena and the modeling approach, and establishes the basic techniques of 3D geological modeling for practical applications in the field of geosciences.     

Probe into Key Techniques of Regional-Oriented 3D GIS On the key techniques of 3D GIS used for regional Geological Information System

Regional Geological Information System combines the multi-dimensional and dynamic spatial information into an integrated spatial information system. 3D geological modeling and its preprocessing or post-processing are the most difficult problems for constructing the system. Based on the current 3D GIS technique, some basic problems in establishing the system are discussed in this paper, including 3D spatial data model, 3D geological modeling, and visualization of 3D geological data. A kind of 3D vector data model based on boundary representation for geological object and its topology was developed in order to model and visualize complex geological structures. In addition, some key techniques are pointed out for further study.     

多软件环境下机床主轴智能化集成设计系统

针对数控机床主轴系统设计需要多个软件协同建模、智能决策与分析仿真的需要,构建了一种由用户定制模块、传动方式配置智能决策模块、优化设计模块以及设计资源中心等组成的主轴智能设计系统的体系结构。提出并实现了Solid Edge、ADAMS、ANSYS以及主轴智能设计系统之间的多软件协同建模、数据交换与共享的方法。论述了三维CAD建模系统、有限元分析系统以及刚-柔耦合系统之间的数据传递的实施技术。所开发的主轴智能设计系统已在数控机床企业进行了应用验证,取得了较好的应用效果,表明本文提出的方法能够有效支持在多软件环境下主轴系统的智能化设计开发工作。     

Methodology of High Accuracy and Resolution 3D Geological Model Generation and Application

By generating a high accuracy and high resolution geological model in Liuchu oil field, the technique of geological modeling is expanded and involved in primary geological study, making the sand bodies and reservoir be easily described in detail. The 3D visualization and 3D interactive editing of geological structure model are the key for modeling procedure. And a high accuracy and resolution geological model has been well applied in optimizing the production scheme.     

3D integrated modeling approach to geo-engineering objects of hydraulic and hydroelectric projects

Aiming at 3D modeling and analyzing problems of hydraulic and hydroelectric en-gineering geology,a complete scheme of solution is presented. The first basis was NURBS-TIN-BRep hybrid data structure. Then,according to the classified thought of the object-oriented technique,the different 3D models of geological and engi-neering objects were realized based on the data structure,including terrain class,strata class,fault class,and limit class;and the modeling mechanism was alterna-tive. Finally,the 3D integrated model was established by Boolean operations be-tween 3D geological objects and engineering objects. On the basis of the 3D model,a series of applied analysis techniques of hydraulic and hydroelectric engineering geology were illustrated. They include the visual modeling of rock-mass quality classification,the arbitrary slicing analysis of the 3D model,the geological analysis of the dam,and underground engineering. They provide powerful theoretical prin-ciples and technical measures for analyzing the geological problems encountered in hydraulic and hydroelectric engineering under complex geological conditions.