安全与环境工程2024，Vol.31Issue(6)：134-144,11.DOI:10.13578/j.cnki.issn.1671-1556.20230772
渗流作用下黄土坡临江一号滑坡滑带土结构演变规律分析
Analysis of the structure evolution law of the sliding zone soil of Huangtupo Linjiang No.1 landslide under seepage condition
摘要
Abstract
The accumulation landslides in the Three Gorges reservoir area experience the effects of reservoir water and seasonal rainfall throughout the year,leading to periodic variations in the internal seepage field.Seepage action is an important factor that influences the microstructural evolution of the sliding zone soil,consequently,its strength and overall stability.In order to reveal the structural evolution patterns of the sliding zone under seepage conditions,this study took the Huangtupo Linjiang No.1 landslide as an example.Remoulded sliding zone soil samples with different durations of seepage were subjected to scanning electron microscopy(SEM)analysis.The permeability coefficients of the sliding zone soil were also measured at each seepage duration.By combining the scanning results of the microstructure of the in-situ sliding zone soil,the influence of seepage action on the structural evolution of the sliding zone was analyzed and discussed.The results show that seepage changes the structural characteristics of the pore space.With the increase in seepage time,the fine clay particles are transported and filled into the larger pore space,so that the effective seepage channel is reduced to stabilize gradually and the permeability coefficient is reduced to stabilize.The initial permeability coefficient of the sliding zone soil of the Linjiang No.1 landslide is 2.88×10-7 cm/s,and it is reduced to 2.32×10-7 cm/s after 48h and stabilized at 2.30×10-7 cm/s after 72 h of seepage.Furthermore,combined with the material composition and structural characteristics of the actual geological body of the Linjiang No.1 landslide,it is considered that the seepage effect on the landslide body varies with the structure of each geological unit within the landslide.The seepage effect of groundwater varies considerably between the layers of different geological bodies,and there may be interfacial seepage.This study can provide a reference for landslide deformation and stability evaluation.关键词
库岸滑坡/渗流作用/滑带土/渗透系数/微观结构Key words
reservoir landslide/seepage effect/sliding zone soil/permeability coefficient/microstructure分类
资源环境引用本文复制引用
王倩芸,唐辉明,鲁莎,安鹏举,夏丁..渗流作用下黄土坡临江一号滑坡滑带土结构演变规律分析[J].安全与环境工程,2024,31(6):134-144,11.基金项目
国家自然科学基金重大项目(42090050) （42090050）
