Deposit comminution in a weak variably-cemented breccia rock avalanche
文献类型：期刊论文
| 作者 | Sun, Juanjuan1,2,3; Frattini, Paolo6; Wang, Xueliang1,2,3; De Blasio, Fabio V.6; Lanfranconi, Camilla6; Jiao, Qisong5; Sala, Gianluca6; Liao, Xiaohui4; Crosta, Giovanni B.6 |
| 刊名 | ENGINEERING GEOLOGY
 |
| 出版日期 | 2023-12-05 |
| 卷号 | 326页码:17 |
| ISSN号 | 0013-7952 |
| 关键词 | Rock avalanche Variably-cemented breccias Block size distribution Comminution processes Grain-grain relative velocity |
| DOI | 10.1016/j.enggeo.2023.107331 |
| 英文摘要 | Rock avalanches display a distinct and complicated behavior that is not yet completely understood. Analyzing the deposit characteristics is crucial for studying the comminution mechanism during its emplacement. Combining field investigation, image processing, and numerical modeling, we explore the deposit characteristics and comminution process of the Wangjiapo rock avalanche triggered by the Mw6.2 Ludian earthquake. First, we use UAV photogrammetry to obtain a three-dimensional point cloud model and a digital orthophoto, from which we semi-automatically extract the geometry and position of 80,602 blocks by adopting a new block photoanalytical procedure, in addition to a further 4388 coarse blocks that were mapped from manual procedure. We analyze the longitudinal and transversal variation of the block distribution within the deposit. Large boulder content was more abundant in the middle part, while the fine blocks were distributed more evenly. Blocks were prevalently equant-sphere (ES) shaped with no dependence on volume and location, but the roundness increased significantly with runout. Additionally, we find fractal dimensions ranging from 1.42 to 1.83, lower with respect to other rock avalanches, probably due to the high weakness of materials. Furthermore, we propose two comminution models based on the significant differences observed between the eastern deposit II and western deposit III, which were caused by variably-cemented breccias. Finally, numerical modeling indicates that the large amount of fine material damped the grain-grain velocity during runout, leading to a limited spread of the rock avalanche and so explaining the short displacement of the front observed. |
| WOS关键词 | SIZE DISTRIBUTION ; 6.2 EARTHQUAKE ; ALPINE FAULT ; FRAGMENTATION ; MODEL ; LANDSLIDES ; TRANSPORT ; CONSTRAINTS ; ROCKSLIDES ; MORPHOLOGY |
| 资助项目 | China Natural Science Foundation[42172304] ; National Key Research and Development Program of China[2019YFC1509703] ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0904] ; China Scholarship Council |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:001098143200001 |
| 资助机构 | China Natural Science Foundation ; China Natural Science Foundation ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; China Scholarship Council ; China Scholarship Council ; China Natural Science Foundation ; China Natural Science Foundation ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; China Scholarship Council ; China Scholarship Council ; China Natural Science Foundation ; China Natural Science Foundation ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; China Scholarship Council ; China Scholarship Council ; China Natural Science Foundation ; China Natural Science Foundation ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; China Scholarship Council ; China Scholarship Council |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/110664]  |
| 专题 | 地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室 |
| 通讯作者 | Wang, Xueliang |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Key Lab Shale Gas & Geoengn, Inst Geol & Geophys, Beijing 100029, Peoples R China 4.Quzhou Univ, 78 Jiuhua North Rd, Quzhou 324000, Zhejiang, Peoples R China 5.Minist Emergency Management, Natl Inst Nat Hazards, 1 Anningzhuang Rd, Beijing 100085, Peoples R China 6.Univ Milano Bicocca, Dept Earth & Environm Sci, DISAT, I-20126 Milan, Italy |
| 推荐引用方式 GB/T 7714 | Sun, Juanjuan,Frattini, Paolo,Wang, Xueliang,et al. Deposit comminution in a weak variably-cemented breccia rock avalanche[J]. ENGINEERING GEOLOGY,2023,326:17. |
| APA | Sun, Juanjuan.,Frattini, Paolo.,Wang, Xueliang.,De Blasio, Fabio V..,Lanfranconi, Camilla.,...&Crosta, Giovanni B..(2023).Deposit comminution in a weak variably-cemented breccia rock avalanche.ENGINEERING GEOLOGY,326,17. |
| MLA | Sun, Juanjuan,et al."Deposit comminution in a weak variably-cemented breccia rock avalanche".ENGINEERING GEOLOGY 326(2023):17. |
入库方式： OAI收割
来源：地质与地球物理研究所
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