摘要
三峡库区独特的地质条件孕育了大量堆积层滑坡,在降雨等强烈外部因素影响下易发生失稳,对库区人民生命财产安全构成威胁;开展对堆积层滑坡的变形机制及稳定性研究对滑坡防治具有较强的指导作用。在对滑坡点进行工程地质分析的基础上,采用GEO-STUDIO数值模拟软件中SLOPE/W模块对偏松树滑坡所选取的3条纵剖面进行变形机制及稳定性评价。结果表明:①滑坡体在暴雨作用下,土体内部抗剪强度参数降低导致自身稳定性降低,加之变形区域斜坡坡度相对较陡,土体在自身重力作用下,向下发生拉裂变形,导致边坡失稳破坏;②偏松树滑坡稳定性计算结果与变形迹象基本一致,滑坡变形呈现中间强两边逐渐减弱的演变趋势;③研究区工程地质条件是滑坡发育的重要影响因素,采用定性与定量评价相结合的稳定性评价方法可为滑坡的防治提供参考。
The unique geological conditions of the Three Gorges Reservoir area developed a large number of accumulation landslides,which are prone to instability under the influence of strong external factors such as rainfall,posing a threat to the safety of people's lives and property in the reservoir area.The study of deformation mechanism and stability of accumulated layer landslide has a strong guiding effect on landslide control.On the basis of engineering geological analysis of landslide points,SLOPE/W module in GEO-STUDIO numerical simulation software was used to evaluate the deformation mechanism and stability of three longitudinal sections selected by Biashu landslide.The results show that:Firstly,under the action of rainstorm,the internal shear strength parameter of the landslide body decreases,which leads to the decrease of its own stability.In addition,the slope in the deformation area is relatively steep.Under the action of its own gravity,the soil body cracks and deformations downward,leading to the instability and failure of the slope.Secondly,the calculation results of the stability of the Piansongshu landslide are basically consistent with the deformation signs,and the landslide deformation shows a trend of gradual weakening on both sides of the strong middle.Thirdly,engineering geological conditions in the study area are important factors affecting the development of landslides.The stability evaluation method combining qualitative and quantitative evaluation can provide reference for the prevention and control of landslides.
作者
王慧
邹建华
吕鹏
陈虹雨
Wang Hui;Zou Jian-hua;Lv Peng;Chen Hong-yu(Sustainable Development Center of the Three Gorges Reservoir Area,Chongqing Three Gorges University,Chongqing 404020;College of Civil Engineering,Chongqing Three Gorges University,Chongqing 404020;-Chengdu Hydrogeological Engineering Geological Center,BGEEMRSP,Chengdu 610081)
出处
《四川地质学报》
2023年第2期318-323,共6页
Acta Geologica Sichuan
基金
三峡库区可持续发展研究中心开放基金项目(2022Sxxyjd07)在渝高校与中科院所属院所合作项目(三峡库区地质灾害大数据智能预测预警云服务平台研发及应用,HZ2021012).
