The Study On Stability Evaluation System Of The High Cut Slope In Three Gorges Reservoir Area Based On GIS

Because there isn't plenty of land for rebuilding and reconstructing new towns and residential areas for the Three Gorges Reservoir transmigrants, so the fact that there are many dangerous high cut slopes is inevitable. Without effective investigation and fully reinforce, once collapse, those high cut slopes will cause seriously damage and loss. Therefore, further research is necessary. In the recent years, with the application of GIS (Geographic Information System) in evaluating the stability of slopes, it seems to be more and more important to make full use of GIS to design an efficient stability evaluation system for the numberless high cut slopes of the Three Gorges Reservoir Area. The GIS is good at space managing and analysing. The new stability evaluation system will be a principle for the whole danger-control system in the Three Gorges Reservoir Area and can play an important role when disaster attacks and even before.Owe to the support of 3S center of Tsinghua University and its"Three Gorges Reservoir Area High Cut Slopes Monitor And Alarm Software And Database Project", I designed a high cut slopes stability evaluation system with the second-round-exploitation groupware of GIS-ArcEngine and Visual C#. The first part intruduces the purpose of this reasearch , reveals the trends of slope-stability research both domestic and abroad, and discusses how to do this study.The second part describes the build of an individual model of the Three Gorges Reservoir Area high cut slope stability evaluation system. I compared various measures to evaluate the stability of slopes, finally chose fuzzy synthetic assessment. Following already existent study, combining with the practical situation, browsing plenty of data, I established specified fuzzy synthetic assessment system, and build my own model. I proof-tested the model with Dagujian High Cut Slope in Zigui county, and the result proved to be correct.In the third part, based on the study of predecessors and combined with the feature of Three Gorges Reservoir Area high cut slope, I chose weighted overlay method to build a model for the whole high cut slope area. It fits for the situation of Shuibatian village of Zigui county well.Under the condition of equally grade between individual and areal high cut slope stability evaluation, I tried to combine them, that's my own innovation. The fundamental principle is to use the areal evaluation result for guidance. At the mean time, we can find the most regular evaluation grade of this area, and use it to correct the primary data. So that we can get more accurate evaluation result. This revolutionary new method offers a chance to correct the former mode.The forth part shows the design scheme of evaluation system. Using the second-round-exploitation groupware of GIS--ArcEngine and Visual C#, I designed Three Gorges Reservoir Area cut slope stability evaluation system. It contains three modules: data management, high slope stability evaluation, and statistic module. The core is high slope stability evaluation, and is composed with individual and areal stability evaluation systems. I also built a simple database using Oracle 9i software to achieve manipulations like data input and output.The fifth part is application proof-test part. I chose Dagujian high cut slope for individual evaluation test sample, Shuibatian, Maoping, Xietan and Shazhenxi for areal evaluation test sample , Shuibatian for statistic test sample. I get a reliable result after separately analysis.With the last part of thesis, I summarize achievements, shortage and prospet.