安全与环境工程2026，Vol.33Issue(1)：19-29,11.DOI:10.13578/j.cnki.issn.1671-1556.20250865
台风暴雨诱发大型凝灰岩滑坡形成机理与动力学特征
Mechanism and dynamics of large-scale tuff landslides triggered by typhoon-induced rainstorms
摘要
Abstract
In recent years,large-scale tuff landslides triggered by typhoon rainstorms have frequently occurred in southeastern China,causing severe casualties and property damage.On August 8,2019,the Lizhima typhoon-induced Shanzao landslide in Yongjia County,Zhejiang Province,resulted in 32 deaths,making it one of the most catastrophic geological disasters in Zhejiang in recent years.This study takes Shanzao landslide as an example to investigate the mechanism and dynamics of large-scale tuff landslides induced by typhoon rainstorms.We analyze the mechanisms of Shanzao landslide based on its geological conditions and basic characteristics.It is concluded that preferential infiltration of rainfall through rear fractures is a key triggering factor,as rising water levels in these fractures exert outward horizontal thrust and seepage pressure,increasing the driving force of the slope.Additionally,the clay interlayers in the tuff become weakened due to saturation,leading to reduced shear strength and the formation of a slip zone,thereby diminishing the resistance of the slope.We also reproduce the dynamic process of Shanzao landslide using the PFC discrete element numerical method.The results indicate that the landslide exhibits clear characteristics of a high-position failure.After failure,the slide mass initiates abruptly and accelerated sharply,reaching speeds over 10 m/s in a short time,completely blocking Shanzao Creek.The slide mass undergoes dynamic fragmentation and debris flow upon violent impact with the slope foot.The front part decelerates rapidly and gradually stops while climbing the opposite valley slope.The middle section is pushed forward by the rear section,transferring kinetic energy from the rear to the front.Ultimately,most of the middle section overrides the front,and the rear section overrides the middle,resulting in the longest travel distance for the rear section,followed by the middle,and the shortest for the front.The findings provide theoretical support for early identification,risk assessment and prevention project design of large tuff landslides induced by typhoon rainstorms in southeastern coastal areas.关键词
台风暴雨/大型凝灰岩滑坡/失稳机理/动力学特征/数值模拟/山早滑坡Key words
typhoon-induced rainstorm/large-scale tuff landslide/failure mechanism/dynamics characteristic/numerical simulation/Shanzao landslide分类
资源环境引用本文复制引用
王紫剑,张明,李贵仁,平措朗加,刘大金,张昭辉,王虎,吴友银..台风暴雨诱发大型凝灰岩滑坡形成机理与动力学特征[J].安全与环境工程,2026,33(1):19-29,11.基金项目
国家自然科学基金面上项目(41772334) （41772334）
华北有色工程勘察院有限公司重点科技攻关项目(CXZX-HZ-2023-01) （CXZX-HZ-2023-01）
