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水库滑坡是三峡库区多发性的地质灾害,其主要诱发因素是库水位升降和降雨,三峡库区重大危险性滑坡专业监测已实施多年,积累了丰富的监测数据。谭家河滑坡是长江干流上重大涉水滑坡,自2006年实施专业监测以来该滑坡持续变形。结合专业监测、库水位和降雨等资料,分别提取了降雨和库水位变化因子,深入细致地分析了滑坡变形特性,给出了该滑坡的变形演化模式,获得了一些新的认识:库水位抬升所产生的付托减重效应对该滑坡变形有一定影响,但影响有限,滑坡变形的主要诱发因素是降雨,雨型、雨强和年降雨量对滑坡变形都有较大的影响。分析成果可为水库型滑坡分类、专业监测系统优化和减灾防灾技术选择提供参考。
The reservoir landslide is a multi-geological disaster in the Three Gorges reservoir area. The main inducing factor is the rise and fall of the reservoir water level and rainfall. The monitoring of the major dangerous landslides in the Three Gorges reservoir area has been implemented for many years and abundant monitoring data have been accumulated. The Tanjiahe landslide, a major wading landslide on the mainstream of the Yangtze River, has been continuously deformed since it was professionally monitored in 2006. Based on the data of professional monitoring, reservoir water level and rainfall, the factors of rainfall and change of reservoir water level were extracted respectively. The deformation characteristics of the landslide were analyzed in detail and metamorphic evolution mode of the landslide was given. Some new understandings were obtained: The effect of entropy and weight loss on landslide deformation has a certain impact, but the impact is limited. The main inducing factors of landslide deformation are rainfall, rainfall type, rainfall intensity and annual rainfall, which have a greater impact on landslide deformation. The results of the analysis can provide references for reservoir landslide classification, professional monitoring system optimization and disaster mitigation and disaster prevention technology selection.