{"title":"Deciphering the dynamics of debris flows through basal stress responses in model experiments","authors":"Cong-jiang Li, Yu-Xiang Hu, Hai-bo Li, Jia-wen Zhou","doi":"10.1007/s11440-024-02461-2","DOIUrl":null,"url":null,"abstract":"<div><p>Comprehending the basal stress and stress fluctuations of debris flows at their boundaries and understanding how these effects influence the dynamics of debris flows are crucial for disaster reduction. In this study, a series of physical model experiments were conducted with varying initial conditions to investigate the basal stress responses and dynamic behaviors of debris flow. Experimental results show that the basal stress at the contact surface of debris flow is significantly influenced by material composition and slope. Specifically, an increase in gravel fraction and slope lead to enhanced basal normal and shear stresses, whereas higher water content exerts the opposite effect. Additionally, the fluctuating stress in normal stress is primarily influenced by material composition, particularly the proportion of coarser materials. Notably, particle agitation is linked to the inertial stress within the debris flow, exhibiting a positive correlation. Enhanced particle agitation facilitates the sparse and vigorous movement of debris flow, further promoting its development. Lastly, a method for predicting flow resistance in debris flow based on macro-scale stress fluctuation monitoring is proposed, providing valuable insights for disaster prevention and mitigation strategies.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 4","pages":"1777 - 1794"},"PeriodicalIF":5.6000,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Geotechnica","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s11440-024-02461-2","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Comprehending the basal stress and stress fluctuations of debris flows at their boundaries and understanding how these effects influence the dynamics of debris flows are crucial for disaster reduction. In this study, a series of physical model experiments were conducted with varying initial conditions to investigate the basal stress responses and dynamic behaviors of debris flow. Experimental results show that the basal stress at the contact surface of debris flow is significantly influenced by material composition and slope. Specifically, an increase in gravel fraction and slope lead to enhanced basal normal and shear stresses, whereas higher water content exerts the opposite effect. Additionally, the fluctuating stress in normal stress is primarily influenced by material composition, particularly the proportion of coarser materials. Notably, particle agitation is linked to the inertial stress within the debris flow, exhibiting a positive correlation. Enhanced particle agitation facilitates the sparse and vigorous movement of debris flow, further promoting its development. Lastly, a method for predicting flow resistance in debris flow based on macro-scale stress fluctuation monitoring is proposed, providing valuable insights for disaster prevention and mitigation strategies.
期刊介绍:
Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.