| The purpose of engineering geological exploration is to provide project planners the basic engineering geological information and planning bases. The geological hazard appraisal is one of most important part of engineering construction.With the rapid development of GIS technique, management of turning geological exploration data into information becomes a trend.The author of this paper researched GIS exploitation technique and read plenty of correlative references,the author realized that geological data management is of practical value to engineering project department. Thus, thanks to those profound data accumulated during previous explorations, the author developed a practical GIS system based on exploitation flat roof Mapgis. The system can manage a throng of engineering geological data.In this paper, thinking Gui-Lian Railway as research object,after investigating and accumulating the geo-environment data,The paper has analyzed main control factors influencing the railway's geological hazard at theory and practice level.On the basis of summarizing predecessors' experience,and vector principal component analysis and first rank order method have been adopted to sift and optimize assessment indexes. the thesis has determined the Gui-Lian Railway geological hazard assessment index system and established classifying standard, which aiming at the characteristic of geological hazard assessment. According to the characteristic of assessment model, the thesis has adopted mainly expertise to quantify qualitative indexes, while quantitative indexes get their value through fuzzy membership function on the basis of classifying standard. According to the characteristic of geological hazard assessment, the thesis has chosen two kinds of simple and practical mathematical methods, gray clustering method and fuzzy comprehensive assessment to establish assessment models, hierarchy analytic process has been applied to find the weight of assessment indexes, and then the two assessment results have also been compared. The analysis module is developed with C++Builder6.0 software.Based on the development platform of MAPGIS, putting GIS into engineering geology management and geological hazard assessment, the paper realized two purpose.The one is geology information management system which has many functions such as efficiently and expediently inquiring, stating and skimming geological map,documents,photos,test data form,another is the geological hazard assessment system. Therefore, this paper just made an endeavor in hope to offer some worthwhile methods for reference in the future. |
