Influence of material characteristics on the failure mode and process of landslide dam

作     者：HU Liang ZHONG Qiming CHEN Liang YANG Meng ZHANG Lucheng WU Hao HU Liang;ZHONG Qiming;CHEN Liang;YANG Meng;ZHANG Lucheng;WU Hao

作者机构：College of Civil and Transportation EngineeringHohai UniversityNanjing 210098China Department of Geotechnical EngineeringNanjing Hydraulic Research Institute National Key Laboratory of Water Disaster PreventionNanjing 210098China Key Laboratory of Reservoir and Dam Safety of the Ministry of Water ResourcesNanjing 210029China 

出 版 物：《Journal of Mountain Science》 (山地科学学报(英文))

年 卷 期：2025年第22卷第1期

页      面：89-109页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.U22A20602,U2040221,and 42207228) the Sichuan Science and Technology Program(2022NSFSC1060) the Fundamental Research Funds for Central Public Research Institutes(Grant No.Y324006) 

主　　题：Landslide dams Overtopping Grain size distribution Breaching process Outflow discharge 

摘      要：Landslide dams,as frequent natural hazards,pose significant risks to human lives,property,and ecological *** grading characteristics and density of dam materials play a crucial role in determining the stability of landslide dams and the potential for dam *** explore the failure mechanisms and evolutionary processes of landslide dams with varying soil properties,this study conducted a series of flume experiments,considering different grain compositions and material *** results demonstrated that grading characteristics significantly influence landslide dam stability,affecting failure patterns,breach processes,and final breach ***-graded materials exhibited a sequence of surface erosion,head-cut erosion,and subsequent surface erosion during the breach process,while well-graded materials typically experienced head-cut erosion followed by surface *** coarse-graded dams,the high permeability of coarse particles allowed the dam to remain stable,as inflows matched *** dam breach model experiments also showed that increasing material density effectively delayed the breach and reduced peak breach flow ***,higher fine particle content led to a reduction in the residual dam height and the base slope of the final breach profile,although the relationship between peak breach discharge and the content of fine and coarse particles was *** better understand breach morphology evolution under different soil characteristics and hydraulic conditions,three key points were identified—erosion point,control point,and scouring *** study,by examining the evolution of failure patterns,breach processes,and breach flow discharges under various grading and density conditions,offers valuable insights into the mechanisms behind landslide dam failures.