基于地质几何分区的反倾边坡倾倒变形特征

摘要

Chongqing Xiaodongcao bank was taken as the research instance for studying reverse slopes'geomet-rical characteristics of toppling deformation's distribution area.First,ArcGIS was used to bank slope geological geo-metric partitioning that based on field engineering geological investigation and analysis.Then the weighted interpo-lation method was adopted for the slope toppling deformation displacement nephogram in allusion to the discrete sur -face displacement monitoring data.At last,by overlaying geological geometry layer partition and displacement ar-rive at that bank toppling of strong horizontal and vertical deformation of the geometric features.The results showed as follows.①Bank slope geological geometric partition area partition is 211 which is the largest in the medium grade,low elevation,north slope area;②Strong level of bank slope deformation of the large area is 211,which is medium grade,low elevation,the north slope area covering 79.24% of the total area of the area.Strong vertical deformation of the large area is 137 which is low slope,high elevation,the northwest slope area covering 87.9%of the total area.%为研究反倾边坡倾倒变形分布区域几何特征,以重庆硝洞槽岸坡为研究实例,首先在现场工程地质调查分析基础上,采用ArcGIS进行岸坡地质几何分区;然后对地表离散位移监测数据采用距离反权重插值法得出岸坡倾倒变形位移云图;最后叠加地质几何分区与位移图层,得出岸坡倾倒水平和垂直强变形分布区几何特征.研究结果表明:①岸坡地质几何分区中面积最大分区为211,即中等坡度、低高程、北坡向区;②岸坡水平强变形最大面积区为211,即中等坡度、低高程、北坡向区,占该区总面积的79.24%,岸坡垂直强变形最大面积区为137,即低坡度、高高程、西北坡向区,占该区总面积的87.9%.