[1]张友谊,钟 磊,樊晓一,等.岷江河谷锄头沟震后泥石流致灾模式[J].山地学报,2021,(5):756-766.[doi:10.16089/j.cnki.1008-2786.000636)]
 ZHANG Youyi,ZHONG Lei,FAN Xiaoyi,et al.New Geo-Disaster Forming Pattern of Post-Shock Debris Flow: A Case Study of the Chutou Gully in the Minjiang River Valley, China[J].Mountain Research,2021,(5):756-766.[doi:10.16089/j.cnki.1008-2786.000636)]
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岷江河谷锄头沟震后泥石流致灾模式
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2021年第5期
页码:
756-766
栏目:
研究简报
出版日期:
2021-11-30

文章信息/Info

Title:
New Geo-Disaster Forming Pattern of Post-Shock Debris Flow: A Case Study of the Chutou Gully in the Minjiang River Valley, China
文章编号:
1008-2786-(2021)5-756-11
作者:
张友谊1钟 磊1樊晓一2顾成壮1田述军1
1.西南科技大学 土木工程与建筑学院,四川 绵阳621010; 2.西南石油大学 土木工程与测绘学院,成都 610500
Author(s):
ZHANG Youyi1 ZHONG Lei1 FAN Xiaoyi2 GU Chengzhuang1 TIAN Shujun1
1.School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China; 2.School of Civil Engineering and Mapping, Southwest Petroleum University, Chengdu 610500,China
关键词:
汶川地震 8.20泥石流 放大效应 锄头沟
分类号:
P642.22
DOI:
10.16089/j.cnki.1008-2786.000636)
文献标志码:
A
摘要:
锄头沟位于岷江河谷汶川县绵虒镇羌锋村,是汶川地震震后大型活跃型泥石流沟,震后大规模泥石流活动造成锄头沟泥石流拦挡工程失效,多次淤积损毁都汶高速公路G317和国道G213。震后泥石流治理工程对泥石流的发展起到一定遏制作用,也改变了泥石流的致灾模式。本文通过实地调查与数据分析,探讨了2019年8.20锄头沟泥石流的成因及对工程设施的致灾模式,提出了拦挡坝对翻坝泥石流能力的放大机理。研究表明:(1)锄头沟8.20泥石流灾害是由各支沟暴发、主沟铲刮而形成的大规模泥石流,受侵蚀铲刮效应影响其冲出规模放大约44.2%;(2)锄头沟泥石流致灾模式主要为:翻坝加速、侵蚀铲刮、侧蚀强烈、弯道雍高、磨蚀槽底、堵断桥涵、冲淤民房;(3)锄头沟泥石流现仍处于发展壮年期,在未来10~20年内遇强降雨仍会暴发大规模泥石流;(4)翻坝泥石流的破坏能力和拦砂坝坝高及过坝运动速度密切相关,当初速度为2 m/s、坝高25 m时,泥石流入射速度是初速度的11.1倍,故有效坝高较高、速度较低的翻坝泥石流对坝下的沟道仍具有很强的冲蚀能力;(5)当过坝泥石流初速度一定时,有效坝高对翻坝泥石流的水平距离的增幅呈下降趋势,这可为坝下副坝位置的选取或护坦尺寸的设定提供科学依据。

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备注/Memo

备注/Memo:
收稿日期(Received date):2020-12-13; 改回日期(Accepted date):2021-05-28
基金项目(Foundation item):国家重点研发计划(2018YFC1505401); 国家自然科学基金面上项目:(41971214,41877524)。[National Key Research and Development Plan(2018YFC1505401); National Natural Science Foundation of China(41971214, 41877524)]
作者简介(Biography):张友谊(1980-),男,博士,副教授,主要研究方向:工程地质。[ZHANG Youyi(1980-), male, Ph.D., associate professor, research on geological engineering] E-mail:53437391@qq.com
更新日期/Last Update: 2021-09-30