库水变动下水库滑坡变形演化机理

Research on landslide and deformation evolution mechanism in reservoir area under reservoir water changes

滑坡变形演化是滑坡内动力物质系统与外动力激励系统相互作用的结果,对于库水变动影响下的水库滑坡而言,内外系统相互作用的过程则是通过地下水的力学作用效应得以体现的,为此可通过库水变动过程中滑坡地下水力学作用效应的强弱关系及其演化规律来揭示水库滑坡的变形演化机理。基于上述思路,以三峡库区巴东县李家湾滑坡为研究对象,首先利用敏感性系数分析方法进行了分区研究;然后,采用神经网络与渗流有限元相结合的反演算法,对滑坡体的渗透系数进行了反演分析;在此基础上,采用渗流稳定性计算方法,揭示了李家湾滑坡的变形演化机理及其稳定性演化趋势,同时结合FLAC3D数值模拟软件,揭示了该滑坡的时空演化特征。研究成果能为三峡库区水库型滑坡防灾减灾提供理论指导与帮助。

The evolution of landslide deformation was the result of the interaction between the dynamic material system in the landslide and the external dynamic excitation system.For the reservoir landslide under the influence of reservoir water change,the process of internal and external system interaction is reflected by the mechanical effect of groundwater.Based on the above ideas,Lijiawan landslide in Badong county,the Three Gorges Reservoir area was studied by using sensitivity coefficient analysis method,then the permeability coefficient of landslide was inversely analyzed by inversion algorithm of neural network combined with seepage finite element.Based on this,the deformation evolution mechanism and stability evolution trend of Lijiawan landslide are revealed by seepage stability calculation method,and at the same time,the spatiotemporal evolution characteristics of the landslide are revealed by FLAC3D numerical simulation software.The research results can provide theoretical guidance and help for reservoir landslide disaster prevention and mitigation in the Three Gorges Reservoir area.