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开挖条件下大礼溪滑坡变形机理分析
引用本文:龚超,易武,黄晓虎,邓永煌. 开挖条件下大礼溪滑坡变形机理分析[J]. 水电能源科学, 2019, 37(3): 121-124
作者姓名:龚超  易武  黄晓虎  邓永煌
作者单位:三峡大学湖北长江三峡滑坡国家野外科学观测研究站;三峡大学湖北省防灾减灾重点实验室;三峡地区地质灾害与生态环境湖北省协同创新中心;宜昌市地质环境监测站
基金项目:湖北省自然科学基金项目(2017CFB436);湖北省水电工程智能视觉监测重点实验室开放基金项目(2016KLA02)
摘    要:为分析开挖条件下大礼溪滑坡变形机理,根据现场调查,并结合滑坡变形特征,运用定性评价方法分析了滑坡的变形发展过程及其机理;发现软弱易风化的粉砂质泥岩坡体、不利的层状同向坡体结构及发育的节理构造是滑坡发生的内因;人工开挖与爆破引发的地震是引发滑坡的外因,降雨作用加速了滑坡变形。最后,通过数值模拟分析开挖条件下滑坡的应力场与位移场的变化,发现滑坡的应力调整与位移变化均具有渐进式变化的特点,分布在滑坡前缘、中部和后缘观察点最小总应力的平均值分别为18.347、-21.888、-76.450kPa;位移平均值分别为147.83、111.14、39.29mm。研究成果对防治滑坡灾害有重要意义。

关 键 词:滑坡  开挖  变形机理  数值模拟

Deformation Mechanism Analysis of Dalixi Landslide under Excavation Conditions
GONG Chao,YI Wu,HUANG Xiao-hu,DENG Yong-huang. Deformation Mechanism Analysis of Dalixi Landslide under Excavation Conditions[J]. International Journal Hydroelectric Energy, 2019, 37(3): 121-124
Authors:GONG Chao  YI Wu  HUANG Xiao-hu  DENG Yong-huang
Affiliation:(National Field Observation and Research Station of Landslide in Three Gorges Reservoir Area of Yangtze River,China Three Gorges University,Yichang 443002;Hubei Key Laboratory of Disaster Prevention and Reduction,China Three Gorges University,Yichang 443002;Collaborative Innovation Center for Geo-Hazard and Eco-Environment in Three Gorges Area,Yichang 443002,China;Yichang Geological Environment Monitoring Station,Yichang 443000,China)
Abstract:In order to analyze the deformation mechanism of the Dalixi landslide under excavation conditions, according to the field investigation and combined with the landslide deformation characteristics, the qualitative development method was used to analyze the deformation development process and the mechanism of the landslide. The results show that the weak and easily weathered silty mudstone slope, the unfavorable layered isotropic slope structure and the developed joint structure are the intrinsic factors of landslide occurrence; The earthquake caused by the artificial excavation and blasting is the main external factor that leads to the landslide occurrence, and the rainfall action accelerates the deformation of the landslide. Finally, numerical simulation was used to analyze the changes of the stress field and the displacement field of the landslide during the excavation. The minimum total stresses distributed at the front, middle and trailing edge of the landslide were 18.347 kPa, -21.888 kPa and -76.450 kPa, respectively; the average displacements were 147.83 mm, 111.14 mm and 39.29 mm. The research results are of great significance for the prevention and control of landslide disasters.
Keywords:landslide   excavation   deformation mechanism   numerical simulation
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