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基于GIS的成兰铁路地质灾害危险性评估研究
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摘要
成兰铁路地处我国四川省和甘肃省境内,线路所在区域山势巍峨,河谷深切,地势险峻,自然生态环境脆弱。线路穿越岷江断裂带、西秦岭断裂带和发生过"5.12”强烈地震的龙门山断裂带,三大岩性复杂出露,大地构造复杂,内外动力地质作用强烈。区域历经多次地震,诱发大量次生地质灾害,造成铁路沿线崩塌、岩堆、滑坡、泥石流等不良地质灾害比比皆是。因此,对区域内地质灾害进行危险性评估,以及对区域内地质灾害进行科学高效的管理,能够为地质灾害的防治及铁路综合选线的信息化提供有力支撑。
     本论文在野外地质调查及资料收集的基础上,根据成兰铁路地质灾害实际情况,在对地震次生地质灾害影响因素的分析后,综合选取影响地震次生地质灾害危险程度的评价指标,采用层次分析法确定指标权重,运用物元分析原理建立了地质灾害危险性评估物元模型,完成了对成兰铁路沿线典型工点的危险性评估工作,并利用GIS的图像显示功能实现对评估结果的可视化输出,为成兰铁路综合选线提供参考。
     论文还详细介绍了研究区地质灾害信息管理系统的设计与开发过程,系统采用GIS二次开发技术及数据库技术进行开发工作,实现了对研究区地质灾害信息的可视化显示、查询检索及综合管理,提高了地质灾害信息管理的效率。
Chen-Lan railroad lies in Sichuan province and Gansu province in China where have steep mountains, deep valleys, complex terrain, and vulnerable natural environment. This line also cut across Minjiang fault zone and West qinling fault zone and Longmenshan fault zone where'5.12'earthquake happened.In those fault zones, The lithology is complicated and tectonic conditions is complicated. Both internal and external dynamics are intense there. Due to several earthquakes and large amount of geological disasters induced by those, large-scale landslides, talus, avalanche, debris flow and other geological disasters happened frequently along the railroad. Thus, the hazard evaluation and efficient management to those geological disasters can provide informative supports to prevention and control of the disasters as well as route selection.
     By collecting and investigating environmental historic materials, this thesis takes analysis the factors and selects the evaluation indicators affecting the disasters based on the ground truth of disasters in Chen-Lan railroad. The Matter-Element evaluation model to weigh the hazard of disasters is constructed based on the Matter-Element analysis. Then the evaluation of hazard of secondary geological disasters is also presented and those results is visualized by GIS with its powerful ability in displaying.
     The details in design and development of information management system concerning regional geological disasters are discussed here. This system takes advantage of database techniques and secondary development techniques in GIS. The implement of visualization of regional geological disasters information, searching and management improve the efficiency of information management in geological disasters.
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