地质科技通报2024，Vol.43Issue(2)：226-237,12.DOI:10.19509/j.cnki.dzkq.tb20230157
"6.1"芦山地震作用下宝兴新华村滑坡动力响应与失稳过程离散元模拟
Discrete element simulation of the dynamic response and instability process of the Xinhua Village landslide in Baoxing County under the"6.1"Lush-an earthquake
摘要
Abstract
[Objective]The shallow potential sliding layer of a slope is an important feature in seismic geological disasters.Its characteristics,such as slope shape and slope structure,tend to complicate the dynamic response and slope damage.[Methods]In this paper,the landslide in Xinhua Village,triggered by the Lushan Ms 6.1 earth-quake,is taken as a case study,and two-dimensional discrete element computational models are developed based on a field investigation.The dynamic response and simulate instability are investigated by comparing numerical sim-ulations of homogeneous and heterogeneous models,representing pure terrain and a shallow potential sliding layer,respectively.[Results]The findings are as follows:(1)The potential sliding layer at the shallow surface of the slope exhibits significant dynamic amplification,which typically increases nonlinearly with height;(2)The slope surface shape has an obvious influence on the slope amplification effect.In the convex part,the amplification effect of the horizontal and vertical acceleration of the slope surface is significant,while the amplification effect of the con-cave part is lower than that of the convex part;(3)In the Xinhua Village landslide,the convex terrain is destroyed before the concave terrain under the effect of micromorphology,and its instability process is divided into five sta-ges,namely,local seismic cracking of vibration amplification,convex terrain destruction,concave terrain destruc-tion,complete destruction of the overall slide and gravity accumulation.[Conclusion]The research results are helpful for deepening the understanding of potential unstable slopes induced by earthquakes and shedding light on disaster prevention and mitigation.关键词
芦山Ms6.1级地震/地震滑坡/动力响应/变形破坏模型/二维离散元模拟/新华村滑坡Key words
Lushan Ms6.1 earthquake/seismic landslide/dynamic response/deformation and failure model/two-dimensional discrete element simulation/Xinhua Village landslide分类
天文与地球科学引用本文复制引用
周赞,罗永红,南凯,李均益,马潇.."6.1"芦山地震作用下宝兴新华村滑坡动力响应与失稳过程离散元模拟[J].地质科技通报,2024,43(2):226-237,12.基金项目
国家自然科学基金项目(42077257) （42077257）
地质灾害防治与地质环境保护国家重点实验室开放基金项目(SKLGP2019K024) （SKLGP2019K024）
