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高速远程崩滑动力学的研究现状及发展趋势
引用本文:林棋文, 程谦恭, 李坤, 等. 2023. 高速远程滑坡碎屑化运动机理研究综述[J]. 工程地质学报, 31(3): 815-829. doi: 10.13544/j.cnki.jeg.2021-0035.2021-0035.
作者姓名:林棋文  程谦恭  李坤  王玉峰  刘世涛
作者单位:①.西南交通大学地质工程系, 成都 610031, 中国;②.西南交通大学高速铁路运营安全空间信息技术国家地方联合工程实验室, 成都 610031, 中国;③.宜宾西南交通大学研究院, 宜宾 644000, 中国
基金项目:国家自然科学基金项目(资助号:42207203, 41877226, U42244229), 第2次青藏高原综合科学考察研究项目(资助号:2019QZKK0905)
摘    要:高速远程滑坡具有体积大、速度高、运动距离远等特点,严重威胁着山区居民生命安全和重大工程建设。滑坡的碎屑化作用是滑坡高速运动过程中非常普遍且十分重要的现象,是滑体运动与堆积过程中特殊内部结构形成的前提条件,也被认为是可能促进高速远程滑坡超强流动性的物理力学机理。尽管滑坡碎屑化机制已经成为滑坡动力学机理研究的热点科学问题,然而对于滑坡碎屑化过程是促进滑坡运动还是阻碍滑坡运动,目前仍存在极大的争议,争议的焦点在于岩石破碎本身是耗能过程,如何能促进滑坡整体的远程运动?本文首先详细总结高速远程滑坡碎屑化作用的沉积学特征,包括反粒序、拼贴构造和局部剪切带等碎屑化堆积结构特征方面的研究,论述这些碎屑化沉积结构对于滑坡动力学的指示;其次,讨论与分析了滑坡碎屑化过程的影响因素、碎屑化过程的减阻机制研究进展;最后,归纳并阐述了高速远程滑坡动力破碎耗能和滑坡减阻这一争议性问题,提出今后高速远程滑坡碎屑化运动机理研究所面临的关键科学问题。

关 键 词:高速远程滑坡  碎屑化  动力破碎  综述
收稿时间:2021-01-22
修稿时间:2021-03-16

The milling factory: Componentry-dependent fragmentation and fines production in pyroclastic flows
Lin Qiwen, Cheng Qiangong, Li Kun, et al. 2023. Review on fragmentation-related dynamics of rock avalanches[J]. Journal of Engineering Geology, 31(3): 815-829. doi: 10.13544/j.cnki.jeg.2021-0035.2021-0035.
Authors:LIN Qiwen  CHENG Qiangong  LI Kun  WANG Yufeng  LIU Shitao
Affiliation:①.Department of Geological Engineering, Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China;②.State-Province Joint Engineering Laboratory of Spatial Information Technology for High-Speed Railway Safety, Chengdu 610031, China;③.Yibin Research Institute of Southwest Jiaotong University, Yibin 644000, China
Abstract:Rock avalanches are characterized by huge volume,high velocity and long runout and greatly threaten human lives and construction of major projects of the mountain areas in China. Fragmentation of rock avalanches is a universal and critical phenomenon,which is one of the prerequisites for the formation of the special internal structures in deposit and even considered as the possible mechanism for the hypermobility of rock avalanches. The fragmentation of rock avalanches has become a highlighted scientific issue in the field of landslide dynamics,since is currently great controversy as whether fragmentation promotes or hinders the mobility of failure mass. The substantial point of this controversy is how the fragmentation process contributes to the runout of the sliding mass when fragmentation itself consuming energy. This article reviews studies on sedimentological characteristics induced by fragmentation process in rock avalanches,including inverse grading,jigsaw structure,retaining of source stratigraphy and local shear band. The implication of fragmentation related deposit characteristics for rock avalanche dynamics is conducted based on those studies. The research progress of the influencing factors of fragmentation process and the friction-weaken mechanisms of rock fragmentation are further discussed. Finally,the controversial issue of energy consumption/friction-weaken induced by fragmentation process is summarized. Then we propose some key issues for future research on the mechanism of fragmentation in rock avalanches.
Keywords:Rock avalanches  Grain fragmentation  Dynamic fragmentation  Review
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