中南大学学报（自然科学版）2023，Vol.54Issue(11)：4461-4471,11.DOI:10.11817/j.issn.1672-7207.2023.11.023
前缘锁固型峡谷边坡失稳源辨识与演化过程模拟
Identification of instability sources and evolution process simulation for leading-edge locking canyon slopes
摘要
Abstract
Based on theoretical analysis and numerical simulation methods,focusing on the deformation of a leading-edge locking canyon slope at the overlap between the Diaokanlang Tunnel and the bridge on the K65+400—K65+690 section of the Ru—Chen(Rucheng—Chenzhou)Expressway in Hunan Province,the instability sources,mechanisms and processes were studied.The results show that the failure mechanism of the shallow and the intermediate landslides is creep and slip-tension,and the instability source is the fractured rock in the foreground of slope.The failure of the deep landslide is in a"three-stage"mechanism of slip—tension—shearing,and the instability source is located in the middle of fault F13.The main controlling structural surface in the deep of the slope is a fault that is approximately parallel to the slope profile,and the locking rock mass at the slope toe is cross-segmented by structural surfaces.Driven by the self-weight stress field,the structural surfaces are progressively damaged to a stable state,and the natural slope is unstable at shallow and intermediate depths while stable at deeper depths.Triggered by the construction disturbance,the internal structural surface of the rock mass continues to extend due to the damage accumulation,shear strength weakening and stress concentration,and plastic deformation occurs in the middle of the corresponding deep fault,showing a tendency of progressive rupture and destabilization.关键词
峡谷/边坡失稳源/锁固段/演化过程模拟Key words
canyon/instability source of slope/locking section/simulation of evolution process分类
建筑与水利引用本文复制引用
胡惠华,鲁光银,陈怡帆,尹湘杰,张鹏,林杭,陈昌富..前缘锁固型峡谷边坡失稳源辨识与演化过程模拟[J].中南大学学报（自然科学版）,2023,54(11):4461-4471,11.基金项目
国家自然科学基金资助项目(42277175,41974148) （42277175,41974148）
湖南省交通运输厅科技进步与创新计划项目(201003,202120)(Projects(42277175,41974148)supported by the National Natural Science Foundation of China （201003,202120）
Projects(201003,202120)supported by the Science and Technology Progress and Innovation Plan of Department of Transportation of Hunan Province) （201003,202120）
