[1]姚鸿坤,邹 强*,蒋 虎,等.泥石流承灾体群体效应特征反演——以7·12四川平武县黑水沟泥石流为例[J].山地学报,2024,(1):47-59.[doi:10.16089/j.cnki.1008-2786.000803]
　YAO Hongkun,ZOU Qiang*,JIANG Hu,et al.Collective Effects of Debris Flow Striking on Structure Clusters Downstream: A Case Study of the Heishui Gully Debris Flow on July 12th in Pingwu County, Sichuan Province, China[J].Mountain Research,2024,(1):47-59.[doi:10.16089/j.cnki.1008-2786.000803]
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泥石流承灾体群体效应特征反演——以7·12四川平武县黑水沟泥石流为例
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2024年第1期
页码:
47-59
栏目:
山地灾害
出版日期:
2024-01-25

文章信息/Info

Title:
Collective Effects of Debris Flow Striking on Structure Clusters Downstream: A Case Study of the Heishui Gully Debris Flow on July 12th in Pingwu County, Sichuan Province, China
文章编号:
1008-2786-(2024)1-047-13
作者:
姚鸿坤1; 2; 邹 强1*; 蒋 虎1; 2; 周文韬1; 2; 陈思谕1; 3; 周 斌1; 2
(1. 中国科学院、水利部成都山地灾害与环境研究所 山地自然灾害与工程安全全国重点实验室,成都 610299; 2.中国科学院大学,北京 100049; 3.西南科技大学 环境与资源学院,四川 绵阳 621010)
Author(s):
YAO Hongkun1; 2;  ZOU Qiang1*;  JIANG Hu1; 2;  ZHOU Wentao1; 2;  CHEN Siyu1; 3;  ZHOU Bin1; 2
(1. State Key Laboratory of Mountain Hazards and Engineering Resilience,Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610299, China; 2. University of Chinese Academy of Sciences,Beijing 100049,China; 3. School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China)
关键词:
建筑群;  黑水沟;  泥石流;  承灾动力响应
Keywords:
structure clusters;  the Heishui gully;  debris flow;  collective effect
分类号:
P954
DOI:
10.16089/j.cnki.1008-2786.000803
文献标志码:
A
摘要:
群体建筑结构的分布格局、结构形式等因素影响泥石流冲击过程和致灾表现。泥石流冲击存在绕流现象、放大作用和遮蔽效应,泥石流与建筑群之间存在复杂的流固耦合模态,但针对这类泥石流承灾体群体效应的过程与机制仍不清晰。本研究通过野外调查、物理实验和数值模拟等方法,调查泥石流承灾体群体效应特征,反演泥石流冲击流场分布和建筑损伤过程,提出了一套建筑群对泥石流的承灾动力响应特征分析方法。研究结果表明:(1)泥石流流场存在放大作用。面对泥石流冲击,建筑群的破坏导致沟道区域流速增加20%,建筑群区域流速增加46%。(2)泥石流流场存在绕流现象。建筑群阻碍泥石流直进输运,导致建筑拐角之间存在局部压力高度集中现象。(3)在建筑群中存在明显的遮蔽效应。失去建筑的上游遮蔽保护可使下游建筑受到的泥石流冲击强度增加120%。(4)泥石流致灾过程中,建筑群周边与内部的泥石流冲击特征差异明显。在建筑群外围,受前排建筑破坏的影响,泥石流流线后排建筑受泥石流冲击时刻提前10 s,泥石流冲击强度增加速率达2.1倍;(5)泥石流对建筑群内建筑冲击强度分为冲击力急剧增加—缓慢增加—逐渐稳定三个阶段,对应泥石流流深增高、缓慢淤积过程。研究结果可以为泥石流易发区村落城镇的建筑规划布局和防灾减灾措施提供科学参考。
Abstract:
The destructive consequence of debris flow striking on structure clusters are subject to the placement of each structure downstream at gully mouth and their structural types. In the process of debris flows running through structure clusters, it exhibits several observable phenomena, such as flow diversion, amplification effect, and shielding action, which are resultants of complex fluid-solid coupling mechanism; unfortunately, there was big unknown to the processes and mechanisms of the collective effects of debris flow on grouped structures.
In this study, it introduced an approach to mathematically describing the collective responses of structure clusters under striking of debris flows. It conducted field investigation, indoor experiments, and numerical simulation, then fluid stress field of debris flow was obtained for a proper interpretation of the complex process of structure damages.
(1)There was an amplification effect for debris flow running through grouped structures. Under debris flow attacking, damaging structure clusters leaded to an increase of 20% in flow velocity in debris flow channel and a 46% increase inside the structures.
(2)There was a flow diverging phenomenon for debris flow running through grouped structures. As debris flow traversing a structure cluster was impeded, it immediately diverged around the block in a circular pattern, leading to a localized pressure concentration at the corners of structures.
(3)There was a noticeable shielding action occurred in structure cluster during debris flow running through grouped structure. Without shelter protection from upstream structures, downstream structures experienced a heavy hit of debris flow at a maximum of 120% increase in impact strength.
(4)There were noticeable differences in responses of a structure cluster to debris flow striking at the positions of its periphery and interior. At the periphery of a structure cluster, affected by upstream structure ruined by debris flow striking, the immediately downstream structure had a 10 seconds earlier time of being attacked by debris flow, with an impact strength of increasing by 2.1 times.
(5)The impact strength of debris flow on a structure cluster could be divided into three stages: rapid increase phase, slow increase phase, and gradual stabilization phase, which corresponded to the process of increasing debris flow depth and slow siltation.
The research provide scientific references for construction layout planning and geo-disaster prevention in debris flow-prone areas of mountain villages.

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备注/Memo

备注/Memo:
收稿日期(Received date): 2023- 06-25; 改回日期(Accepted date):2024- 02- 02
基金项目(Foundation item): 国家自然科学基金(42171085); 中国科学院西部之光基金(xbzg-zdsys-202104); 四川省科技厅计划(2023YFS0434)。[National Nature Science Foundation of China(42171085); West Light Foundation of Chinese Academy of Sciences(xbzg-zdsys-202104); Sichuan Science and Technology Planning Program(2023YFS0434)]
作者简介(Biography): 姚鸿坤(1997-),男,江西吉安人,硕士研究生,主要研究方向:山地灾害动力过程。[YAO Hongkun(1997-), male, born in Jian, Jiangxi province, M.Sc. candidate, research on the dynamic process of mountain disasters] E-mail:yhk@imde.ac.cn
*通讯作者(Corresponding author): 邹强(1982-),男,博士,研究员,主要研究方向:山地灾害致灾机理与风险。[ZOU Qiang(1982-), male, Ph.D., professor, research on disaster-causing mechanisms and risks of mountain hazards] E-mail:zouqiang@imde.ac.cn
更新日期/Last Update: 2024-01-30