[1]夏式伟,郑昭炀,袁小一,等.芦山地震汤家沟滑坡-碎屑流过程模拟[J].山地学报,2017,(04):527-534.[doi:10.16089/j.cnki.1008-2786.000250]
　XIA Shiwei,ZHENG Zhaoyang,YUAN Xiaoyi,et al.Dynamic Simulation of Tangjia Valley Rock Avalanche in Tianquan, Sichuan, China[J].Mountain Research,2017,(04):527-534.[doi:10.16089/j.cnki.1008-2786.000250]
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芦山地震汤家沟滑坡-碎屑流过程模拟()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2017年04期
页码:
527-534
栏目:
山地灾害
出版日期:
2017-07-30

文章信息/Info

Title:
Dynamic Simulation of Tangjia Valley Rock Avalanche in Tianquan, Sichuan, China
文章编号:
1008-2786-(2017)4-527-08
作者:
夏式伟; 郑昭炀;  袁小一;  邢爱国*
上海交通大学 土木工程系,上海200240
Author(s):
XIA Shiwei;  ZHENG Zhaoyang;  YUAN Xiaoyi;  XING Aiguo*
Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
关键词:
芦山地震;  滑坡-碎屑流;  数值模拟;  动力特性;  DAN3D
Keywords:
Lushan earthquake;  rock avalanche;  numerical simulation;  DAN3D model
分类号:
P642.22
DOI:
10.16089/j.cnki.1008-2786.000250
文献标志码:
A
摘要:
2013年4月20日四川省芦山县发生Ms7.0级强烈地震,诱发芦山县、天全县、宝兴县等多个县区2500多处崩塌、落石、滑坡、泥石流等次生灾害,但规模较小。天全县老杨乡汤家沟滑坡-碎屑流是此次地震诱发的最大一处滑坡,在地震作用下约有53万m3的岩体自滑源区高速滑出。因剪出口下方山脊的阻挡作用滑体沿左右两侧发生分叉,此后分别沿春尖窝沟和干沟头沟高速运动,滑行约340 m和440 m后与各自沟谷侧壁发生撞击、爬坡解体为碎屑流,碰撞转向后继续向下滑行,总滑行距离约1.6 km,高程差约480 m。尽管关于芦山地震滑坡的研究很多,但对滑坡全过程动态模拟的研究较少。本文通过滑坡现场调查,解析了汤家沟滑坡的基本运动特征和滑体运动过程中发生的碰撞、铲刮、堆积等现象,并基于DAN3D动力分析软件,采用Friction-Voellmy复合模型反演了汤家沟滑坡运动全过程,得到了滑体的堆积、速度分布以及铲刮等特征。
Abstract:
On April 20, 2013, a catastrophic rock avalanche was triggered by the Lushan earthquake in Sichuan Province, China.The rock avalanche motivated 530 000 m3 of sandstone from the source area.After detaching from its source area, the slide mass ran down rapidly along the direction of 130° and the displaced materials were divided into two streams as a result of blockages of a small ridge at an elevation of 1480 m.The two debris streams flowed along two valleys after colliding with the ridge.The left part of the displaced materials travelled a distance of 340 m along the direction of 156°, impacting the left side of the Chunjianwo valley and ran up to the side slope at a maximum run-up height of 35 m.A minor portion of the materials flowed upstream, whereas most of the materials continued to flow downstream and finally converged into the right part of the displaced materials at an elevation of 1200 m.The right part of the displaced materials travelled a distance of 440 m along the direction of 104°.The debris superelevated on the right side of the Gangoutou Valley with a height of 15 m, then diverted at an angle of 35° along the valley floor and finally ceased at the Tangjia valley at an elevation of 1160 m.The displaced materials travelled 1,600 m with a descent of 480 m, and the final volume was accumulated to be approximately 1000 000m3.The basic pattern of this rock avalanche was concluded by a detailed field investigation.It revealed that the rock avalanche resulted in one superelevation in the Gangoutou Valley and a run-up in the Chunjianwo Valley.To understand the post-failure behavior of the rock avalanche, a numerical model(DAN-3D)was used to simulate the landslide propagation.By means of trial and error method, a combination of Frictional model and Voellmy model convinced of the best performance in simulating the rock avalanche propagation according to in site survey of run-out, distribution and thickness of the final deposit.The results of simulation suggested that the rock avalanche had a duration of about 160 s and a maximum velocity of 30 m/s.

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[3]苏凤环,崔鹏,张建强,等.芦山地震重灾区崩塌滑坡易发性评价[J].山地学报,2013,(04):502.
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备注/Memo

备注/Memo:
收稿日期(Received date):2016-07-18; 改回日期(Accepted date):2016-10-17
基金项目(Foundation item):国家自然科学基金重点项目(41530639)[National Natural Science Foundation of China Key Program(N41530639)]
作者简介(Biography):夏式伟(1990-),男,硕士研究生,主要从事高速远程滑坡研究[Xia Shiwei(1990-),male, M.Sc candidate, principally engaged in high-speed and long-runout landslide research.]E-mail:903092557@qq.om.
*通讯作者(Corresponding author):邢爱国(1971-),男,研究员,博士生导师,主要从事地质灾害防灾减灾方面的研究工作[Xing Ai-guo(1971-),male, professor, specialized in geological hazard prevention and mitigation.] E-mail: xingaiguo@sjtu.edu.cn.
更新日期/Last Update: 2017-07-30