人民长江2024，Vol.55Issue(4)：160-168,9.DOI:10.16232/j.cnki.1001-4179.2024.04.021
三峡库区三门洞滑坡复活机理及韧性变形研究
Study on reactivation mechanism and ductile deformation of Sanmendong Landslide in Three Gorges Reservoir area
摘要
Abstract
The impoundment of the Three Gorges Reservoir triggers a large number of reactivated and deformed ancient land-slides along the reservoir banks.The concept of"ductile deformation"is introduced to explain the differential deformation re-sponse of ancient landslides under similar influencing factors.Taking the Sanmendong Landslide in the Three Gorges Reservoir ar-ea as an example,we analyzes the deformation characteristics and the mechanism of"ductile deformation"during the reactivation process based on field geological investigations and 17 a of monitoring data.The research findings indicate that:① The Sanmen-dong Landslide is a gentle ancient sedimentary landslide that is reactivated and deformed after the impounding of the Three Gorges Reservoir.The main deformation features at the front,middle,and rear parts of the landslide are bank collapse,tensile cracks or slumping,and tensile-shear cracks respectively.② During the falling stage of reservoir water level,the landslide deformation is sensitive to rapid water level decrease.When the reservoir operates at low water levels and during the water rising periods,rainfall especially continuous heavy rainfall is the main triggering factor of landslide deformation,resulting in sustained deformation.③During the occurrence of"ductile deformation",the internal part of the landslide undergoes a process of compaction,leading to in-creased soil density and enhanced cohesion,thus improving the shear resistance of the soil and providing the strength to resist sub-sequent deformations for a certain period.The research results can provide a reference for landslide monitoring and early warning in Three Gorges Reservoir area.关键词
古滑坡/复活机理/韧性变形/三门洞滑坡/三峡库区Key words
ancient landslide/reactivation mechanism/ductile deformation/Sanmendong Landslide/Three Gorges Reservoir area分类
天文与地球科学引用本文复制引用
张家旭,易庆林,邓茂林,安知利,彭云飞,雷玉..三峡库区三门洞滑坡复活机理及韧性变形研究[J].人民长江,2024,55(4):160-168,9.基金项目
国家自然科学基金面上项目(42172303) （42172303）
