基于GIS技术的玉林-铁山港公路沿线崩塌、滑坡灾害危险性区划

文章以MAPGIS6.7、MORPAS3.0和Geodas 4.0软件为平台,综合应用信息量法、证据权法和模糊证据权法,采用两级混合的预测方法对玉林—铁山港公路沿线崩塌、滑坡地质灾害进行了危险性区划,共划分为高度危险性区、中高度危险性区、中度危险性区和轻度危险性区4级。预测结果显示:研究区崩塌、滑坡灾害危险性级主要为轻度危险等级。中高度—高度危险区范围较小,且主要分布于研究区中北部AK51、AK60~AK65和AK95~AK105路段;上述区段水系发育,沟谷较多,山坡陡峻,岩土体结构多具中厚层状坚硬、较坚硬砂岩、粉砂岩、砂砾岩夹软质泥岩、页岩岩组特征,断裂构造发育,地表残坡积层厚度大,结构松散,夏季暴雨频发,崩塌、滑坡灾害条件基本具备,易于形成和诱发;因此,应重点加强上述区段的灾害监测和防治工作。

The possiblility assessment of collapse and landslide hazards along the Yulin-Tieshangang expressway in Guangxi,based on GIS technology

With the softwares of Mapgis6.7,Morpas 3.0 and Geodas 4.0 and the methods of integrateing In-formation value method,weights of evidence method and fuzzy weights of evidence method,the article di-vides the areas around Yulin-Tieshangang expressway into 4 grades of collapse and landslide zonation by Gra-ded-Prediction method,including high risk zonation,mid-high risk zonation,moderate risk zonation and the mild risk zonation.The result suggests that the areas along the Yulin-Tieshangang expressway are mainly coved by the mild risk zonation,and the areas of the high risk and mid-high risk zonations are smaller and al-mostly located in the regions of AK51,AK60~AK65 and AK95~AK105,where the rivers,valleys with steep slopes and faulted structures are universal,and harder sandstone,siltstone,glutinite,coverd by thick-bedded and loose slope debris,are developed.In addition,the rainstorms happen frequently in the summer a-long Yulin-Tieshangang expressway.Therefore,we can find the conditions for collapses and landslides are favourable in the high risk and mid-high risk zonations where most hostorical collapses and landslides hap-pened.We will enhance the survey of disaster monitoring and hazard prevention.