岩土工程中基于栅格的三维地层建模及空间分析

地理信息系统（GIS）及空间信息分析技术的发展为解决复杂的岩土工程科学问题提供新的手段,三维空间的地层和硐室建模是岩土工程GIS信息技术的核心内容。在此基础上,研究三维空间分析算法并实现具备强大面向对象分析功能的GIS信息系统,是该项技术在岩土工程领域得以推广应用的前提条件。以典型的工程应用实例为背景,介绍基于栅格的包含多元信息（监测设施、工程措施和地质断层等）的三维地层建模技术,详细探讨地层模型中的任意单纯地层剖面生成、地层与三维场景中的水位面及实体相交、地层与硐室的混合剖切算法及面积和体积的空间计算等分析功能。

THREE-DIMENSIONAL GRID-BASED STRATA MODEL AND SPATIAL ANALYSIS IN GEOTECHNICAL ENGINEERING

The technologies of geographic information system(GIS)and spatial information provide a new method for solving complex problem in geotechnical engineering,where the technology of model construction for strata and caverns in three-dimensional space is a key issue.Analysis of developing spatial three-dimensional strata model will make it possible for GIS to be successfully applied to geotechnical engineering.However,there are few references related to this subject at present.Based on a typical slope project in Longtan Hydropower Station,the technique for model construction of three-dimensional grid strata model which consists of multi-variant information such as monitoring facilities,construction measures and faults,is introduced.In addition,some spatial analysis algorithms such as generation of simple strata cross-section,intersection between strata and three-dimensional objects,hybrid sectional algorithm between strata and cavern,spatial calculation for area and capacity in arbitrary zone are discussed.The proposed technology will give some useful references to the continuous research on this subject.