[1]刘世成a,王运生b*,宋 良a.四川茂县叠溪堰塞坝溃决的实验研究[J].山地学报,2024,(5):672-684.[doi:10.16089/j.cnki.1008-2786.000853]
　LIU Shichenga,WANG Yunshengb*,SONG lianga.Experimental Interpretation of a Historical Landslide Dam Failure at Diexi Town in Maoxian County, Sichuan Province, China[J].Mountain Research,2024,(5):672-684.[doi:10.16089/j.cnki.1008-2786.000853]
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四川茂县叠溪堰塞坝溃决的实验研究
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2024年第5期
页码:
672-684
栏目:
山地灾害
出版日期:
2024-10-20

文章信息/Info

Title:
Experimental Interpretation of a Historical Landslide Dam Failure at Diexi Town in Maoxian County, Sichuan Province, China
文章编号:
1008-2786-(2024)5-672-13
作者:
刘世成a; 王运生b*; 宋 良a
(成都理工大学a. 环境与土木工程学院; b. 地质灾害防治与地质环境保护国家重点实验室,成都 610059)
Author(s):
LIU Shichenga;  WANG Yunshengb*;  SONG lianga
(a. College of Environment and Civil Engineering; b. State Key Laboratory of Geo-Hazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China)
关键词:
堰塞坝;  似反粒序;  破坏模式;  叠溪
Keywords:
landslide dam;  quasi-inverse grading;  erosion mode;  Diexi
分类号:
TV149.2
DOI:
10.16089/j.cnki.1008-2786.000853
文献标志码:
A
摘要:
滑坡堰塞坝上下游坝体结构与颗粒组分展现出显著差异性。虽然国内外学者对各类堰塞坝体的溃决机制进行了广泛研究,但已有研究在坝体粒序的选择上存在局限性,加之堰塞坝结构的复杂性,使得天然溃决过程与人工土石坝溃坝存在根本不同。本文选取1933年四川阿坝羌族藏族自治州茂县叠溪镇发生Ms7.5级强震诱发的滑坡堵江事件为案例,通过野外实地取材并进行物理模型实验,探究似反粒序结构下,不同颗粒级配的滑坡堰塞坝溃决过程。研究结果表明:(1)似反粒序结构下侵蚀过程依次经历渗流、冲刷、侧蚀、下切、破坏5个阶段。(2)当颗粒级配d50=30 mm级配时,溃口的横向拓展模式主要表现为整体式剪切错动,致使溃口流量迅速上升且消退缓慢,侵蚀曲线整体呈现出平缓态势。(3)当d50=14.2 mm 时,溃口的横向拓展模式则转变为整体式的重力崩塌,侵蚀曲线相对陡峭,溃口流量呈现出快速上涨与迅速消退的特点。研究结果可为滑坡堰塞坝溃决机理研究及防治提供参考。
Abstract:
The structures and particle compositions of landslide-formed barrier dams exhibit significant differences between the upstream and downstream parts. Although research was conducted extensively by scholars on breaching mechanisms of various landslide dam bodies, there was limitation in the selection of dam particle sequences, and the complexity of the structure of barrier dams made the natural breaching process fundamentally different from the breaching of artificial earth-rock dams.
This paper selected the landslide-induced river blocking event in 1933 triggered by the Ms7.5 earthquake in Diexi Town, Mao County, Sichuan Province, China as a case study. Through fieldwork and in-situ physical modeling experiments, the failure process of landslide dams with different particle gradings under a quasi-inverse grading structure was examined.
(1)The erosion process of in-situ barrier dams built with quasi-inverse grading structure went through five stages of seepage, scouring, lateral erosion, downcutting, and destruction.
(2)As particle gradation was d50=30 mm, a lateral corrosion developing at breach manifested as a holistic shear faulting, causing a rapid increase but slow recession of breaching flow rate, with the erosion curve showing an overall gentle trend.
(3)As d50 was 14.2 mm, the lateral corrosion at the breach shifted to a holistic gravitational collapse, with the erosion curve being relatively steep, and the breach flow exhibited a pattern of rapid rise and quick recession.
The research provides reference for the mechanism research and prevention of landslide dam break.

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备注/Memo

备注/Memo:
收稿日期(Received date): 2023- 08- 08; 改回日期(Accepted date): 2024- 09- 07
基金项目(Foundation item): 国家自然科学基金(41877235); 国家重点研发计划(2017YFC1501000)。 [National Natural Science Foundation of China(41877235); National Key Research and Development Program of China(2017YFC1501000)]
作者简介(Biography): 刘世成(1998-),男,四川成都人,硕士研究生,主要研究方向:工程地质和地质灾害。[LIU Shicheng(1998-), male, bron in Chengdu, Sichuan Province, M. Sc. candidate, research on engineering geology and geological disaster] E-mail: 1159554101@qq.com
*通讯作者(Corresponding author): 王运生(1960-),男,博士,教授,主要研究方向:工程地质。[WANG Yunsheng(1960-), male, Ph.D., professor, research on engineering geology] E-mail: 1109286292@qq.com
更新日期/Last Update: 2024-09-30