摘要
滑坡是黔北地区常见的地质灾害,政府每年都投入大量的资金开展相关的治理和研究,但是针对滑坡变形及其演化影响的模拟分析,目前所开展的工作仍然十分不足。为此,结合黔北地区典型滑坡野外的勘察和调查,设计了不同地层倾角和摩擦条件的6组物理模型对滑坡变形进行了研究,并应用PIV技术对滑坡变形演化过程中的应变速率场进行了分析探讨。研究表明:(1)地层倾角对滑坡具有强烈的控制作用。低地层倾角条件下,坡体的变形演化存在穿时现象;而高地层倾角条件下,坡体主要是从后缘到中部,再到前缘的逐步扩展变形。(2)侧向摩擦强度影响坡体的几何形态,具有较高侧向摩擦力的滑坡,形成的坡体几何形态呈条带状分布特征;相反,具有低摩擦力的滑坡,则形成近似椭圆形状的坡体。该物理模拟结果可为黔北地区滑坡演化过程的理解提供构造物理学证据。
Landslides are a common geological hazard in northern Guizhou Province,and the government invests a lot every year to carry out related governance and research.However,the simulation analysis of landslide deformation and its evolutionary impact is still very insufficient.For this purpose,based on the field survey and investigation of typical landslides in the Northern Guizhou Province,six groups of sand-box models with different stratigraphic dip and lateral friction conditions were designed to study landslide deformation.PIV technology was applied to analyze and explore the strain rate field during the evolution process of landslide deformation of the analogue modelling test.The results showed that:①The stratigraphic dip has a strong effect on landslides.Under the condition of the low-dip angle,the deformation evolution of the landslide exhibits a diachronism phenomenon.Under the condition of the high-dip angle,the landslide mainly undergoes gradual propagation and deformation from the rear zone to the middle zone,and then to the front zone.②The strength of lateral friction affects the geometric shape of the landslide.Landslides with high lateral friction form a strip-shape accumulated body.On the contrary,landslides with low-friction form an approximate elliptical shape.Analogue modelling results of this study can provide structural physics references for understanding the evolution process of landslides in northern Guizhou Province.
作者
何文刚
赵远雯
何鸣
袁达雄
HE Wengang;ZHAO Yuanwen;HE Ming;YUAN Daxiong(Department of Engineering and Technology,Zunyi Normal University,Zunyi 563006,China)
出处
《人民长江》
北大核心
2024年第1期135-142,207,共9页
Yangtze River
基金
贵州省科技厅项目(黔科合基础-ZK[2022]一般571)
合肥师范学院大创项目(S202210664096)
国家留学基金委项目(CSC201908520019)。
关键词
滑坡变形
演化过程
地层倾角
侧向摩擦作用
物理模拟
黔北地区
landslide deformation
evolution process
stratigraphic dip
lateral friction action
physical simulation
northern Guizhou Province
