摘要
为了支撑城镇国土空间规划,避免将地质灾害高易发区作为城镇发展方向,选取地质灾害高发频发的汉阴县漩涡镇为研究范例,开展大比例尺、精细化斜坡孕灾地质环境条件调查.选取斜坡的地形地貌(地貌、坡面形态、剖面形态、坡高、坡度、坡向)、地质构造、工程地质岩组(岩体坚硬程度、岩体完整程度、覆盖层类型、覆盖层厚度)、斜坡结构、地表水、地下水、人类工程活动(切坡建房、切坡修路、斜坡开垦)等7大类17项孕灾因子,采用多元逻辑回归分析与地质灾害发育的关系.结果表明,斜坡坡面形态、剖面形态、坡度、岩体坚硬程度、岩体完整程度、覆盖层厚度、地表水、切坡建房与切坡修路、斜坡开垦等9项因子对山区斜坡地质灾害发育有明显的控制作用,以9项关键因子建立地质灾害易发性评价模型可提高易发性区划的准确度.
Abstract
In order to support the spatial planning of urban land and avoid taking the highly prone area of geological disasters as the development direction,the Xuanwo Town,Hanyin County,which is prone to geological disasters,is selected as the research example to carry out large-scale and refined geological environmental conditions of slope disasters.Select the landform(landform units,surface shape,profile shape,height,gradient,aspect),tectonics,engineering geology(rock strength,rock integrity,overburden types,overburden thickness),slope structure,river,groundwater,human engineering activities(such as building houses,building roads,and cultivating)classified into 7 categories,17 factors,to analyze the relationship between geological hazard development and geological hazard in multiple logistic regression analysis.The results show that slope surface shape,profile shape,gradient,rock strength,rock integrity,building houses and roads on slopes,slope cultivation are believed to have a significant control effect on the development of slope geological hazards.Establishing a geological hazard susceptibility evaluation model based on nine key factors can improve the accuracy of susceptibility zoning.
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