工程地质学报2023，Vol.31Issue(6)：1910-1928,19.DOI:10.13544/j.cnki.jeg.2021-0645
陕西山阳"8·12"大型山体滑坡运动特征及数值模拟分析
KINEMATIC CHARACTERISTICS AND NUMERICAL SIMULATION ANALY-SIS OF"8·12"GIANT LANDSLIDE IN SHANYANG COUNTY,SHAANXI PROVINCE
摘要
Abstract
On August 12,2015,a giant landslide occurred in Yanjiagou Village,Zhongcun Town,Shanyang County,Shaanxi Province.The landslide debris destroyed and buried 18 houses,resulting in 7 people dead and 64 people missing.Based on extensive field geological investigation and UAV aerial survey,this paper provides a com-prehensive description on the basic characteristics of the Shanyang landslide and makes engineering geological zon-ing.Then,the formation mechanism and movement process of the landslide are preliminarily revealed.Finally,the discrete element software PFC3D is used to simulate the movement process of the Shanyang landslide,reproducing the whole process of starting,collision and accumulation along the apparent tendency direction under the action of gravity after the landslide body is destabilized.The main findings of this paper are as follows.(1)Shanyang land-slide is a typical bedding rock slope with apparent tendency instability.The long-term bedding creep of the landslide mass,coupled with the surface water dissolution,eventually led to the shear failure of the locking section and the o-verall destabilization damage along the apparent tendency direction.(2)In the movement process of the landslide body,due to the obstruction of the front stable mountain,the movement direction of the Shanyang landslide was de-flected twice by collision.Moreover,the special motion accumulation features,such as layer overlap,demolition movement and lateral squeeze slide,were produced.(3)Based on the accumulation characteristics and structural distribution characteristics of the Shanyang landslide,the movement and failure process of the Shanyang landslide are divided into seven stages,namely,the landslide creep and edge formation stage,the locking section shearing and slide initiation stage,the overall high-speed sliding stage,the collision and"emergency braking"stage,the detachment lateral extrusion sliding stage,the secondary collided and flowing stage and secondary collapse sliding of the scarp cliff.(4)The numerical simulation results show that the Shanyang landslide only takes 35 s from the in-itiation to the final stopping,with a maximum movement distance of 500 m and a maximum velocity of 36.2 m·s-1.关键词
山阳滑坡/运动特征/成因机制/岩体结构/数值模拟Key words
Shanyang landslide/Kinematics characteristics/Formation mechanism/Rock mass structure/Numer-ical simulation分类
天文与地球科学引用本文复制引用
孟桓羽,占洁伟,卢全中,俞朝悦,亢佳乐,孙月敏..陕西山阳"8·12"大型山体滑坡运动特征及数值模拟分析[J].工程地质学报,2023,31(6):1910-1928,19.基金项目
国家自然科学基金青年科学基金项目(资助号:42007269),博士后创新人才支持计划项目(资助号:BX20200286),长安大学中央高校基本科研业务费专项资金(资助号:300102261103).This research is supported by the National Natural Science Foundation for Young Scientists of China(Grant No.42007269),the National Postdoctor-al Program for Innovative Talents(Grant No.BX20200286)and the Fundamental Research Funds for the Central Universities,CHD(Grant No.300102261103). （资助号:42007269）
