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云南永胜、宾川一带新构造运动活跃,巨型、大型滑坡现象显著。为了分析区内滑坡的发育分布规律、动力成因及其与地质地貌的关系,在以目视解译为主获得615个滑坡点的基础上,进一步选取8个滑坡影响因子,包括断层、水系、岩性、NDVI、坡度、坡向、地形起伏度和高程,利用级联BP神经网络模型进行了计算分析,发现该区影响因子指数高的区域具有明显的聚集性,并据此划分出4个高指数区。经过进一步讨论分析认为,研究区的滑坡主要由地震滑坡、冲蚀型滑坡和崩积加载型滑坡3类构成,尤以地震滑坡为主,即活动断裂是研究区滑坡最主要的影响因素。结合对该区典型古地震滑坡的地表调查结果,进一步证明了该区的程海-宾川断裂带第四纪期间的长期强烈活动对永胜、宾川地区的滑坡发育起着重要控制作用,同时也表明模型结果具有良好的可信度。
The Neotectonics of Yongsheng and Binchuan in Yunnan Province are active, and the giant and large-scale landslides are significant. Based on the analysis of the development and distribution of landslides and their relationship with the geology and geomorphology, based on the analysis of 615 landslide points, eight landslide influencing factors were further selected, including fault, water system, Lithology, NDVI, slope, aspect, topographic relief and elevation were calculated and analyzed by using the cascade BP neural network model. It was found that the area with high index of influence factor had obvious aggregation, and four High index area. After further discussion and analysis, the landslides in the study area are mainly composed of three types of earthquake landslides, erosion-type landslides and collapse-loading landslides, especially earthquake landslides. That is, active fractures are the most important factors affecting landslides in the study area. Combined with the surface survey results of typical paleo-earthquake landslides in this area, it is further proved that the long-term strong activity during the Quaternary Period of the Chenghai-Binchuan Fault Zone in this area plays an important controlling role in the landslide development in Yongsheng and Binchuan areas. It also shows that the model results have good credibility.