[1]许声夫,李渝生*,王金鹏.则木河断裂中段山体溃滑事件的临界动力强度[J].山地学报,2016,(02):187-193.[doi:10.16089/j.cnki.1008-2786.000117]
　XU Shengfu,LI Yusheng,WANG Jinpeng.Relationship between Dynamic Strength and Landslide Shapein Middle of Zemuhe Fault Zone[J].Mountain Research,2016,(02):187-193.[doi:10.16089/j.cnki.1008-2786.000117]
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则木河断裂中段山体溃滑事件的临界动力强度()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2016年02期
页码:
187-193
栏目:
山地灾害
出版日期:
2016-04-01

文章信息/Info

Title:
Relationship between Dynamic Strength and Landslide Shape in Middle of Zemuhe Fault Zone
作者:
许声夫1; 李渝生1; 2*; 王金鹏1
1.成都理工大学环境与土木工程学院,四川 成都610051; 2.地质灾害防治与地质环境保护国家重点实验室/成都理工大学,四川 成都 610051
Author(s):
XU Shengfu1; LI Yusheng1; 2; WANG Jinpeng1
1.Environmental and Civil Engineering College,Chengdu University of Technology, Chengdu 610059, China; 2.State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection/Chengdu University of Technology, Chengdu 610059, China
关键词:
古滑坡;  断裂带;  强烈地震;  动力响应
Keywords:
ancient landslide;  fault;  strong earthquake;  dynamic response
分类号:
P642.2; X43
DOI:
10.16089/j.cnki.1008-2786.000117
文献标志码:
A
摘要:
在现代地震较为平静的则木河断裂带中段,集中分布有一系列大型古滑坡,并具有高速、远程碎屑流等强动力特征,这些现象给人类进一步探索“大规模滑坡事件”提供了诸多思索和启发。以底古村附近﹑规模达3.7×108 m3的巨型古滑坡为研究对象,根据地质调查数据建立山体的岩体力学概念模型。运用具有模拟动力环境条件的离散元数值分析程序(UDEC),探明山体失稳的临界动力条件为a=0.6 g,之后陆续增大地震加速度(a分别为0.8 g、1.0 g、1.2 g、1.4 g、1.6 g),观察程序计算出不同加速度条件下的滑坡堆积状态可知,当a=1.6 g时滑坡堆积状态与当前地貌相符,进一步得出诱发山体发生高速远程碎屑流运动的初始加速度为a≥1.6 g(相当于Ⅺ度地震的动力强度)的基本结果。由此推论:该巨型滑坡事件是由强度超过Ⅺ度的地震所触发,近代地震活动极为平静的断裂带中段,历史上曾发生过Ⅺ度以上强烈地震。
Abstract:
Large ancient landslides are found along the central segment of Zemuhe fault in Southwestern Sichuan of China, which concentrate at the part with relatively calm seismic activities in the modern history. Strong dynamic characteristics can be observed in the landsides, including high speed and long travel distance of the debris. It is postulated that these landslides may have been triggered by a violent prehistoric earthquake, or numerous strong seismic activities occurred in the middle of Zemuhe fault zones. The study aims at understanding the failure mechanism of Digu landslide and the simulation of its failure process based on the field investigation. The size of Digu landslide is estimated to be approximately 10×107 m3. Discrete element numerical analysis(UDEC)is applied to simulate the dynamic conditions and to analyze the critical dynamic condition that triggered the slope failure. The critical dynamic condition is achieved when the earthquake acceleration a≥1.6 g and seismic intensity of XI equivalently based on the results of the simulation, in which the failure modes are similar to the prototype.It is possible that the gigantic Digu landslides was triggered bystrong earthquake of with the earthquake intensity equal or greater than the level of XI occurred in the middle of Zemuhe fault zones in the past.

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相似文献/References:

[1]胡新丽,殷坤龙.大型水平顺层滑坡形成机制数值模拟方法——以重庆钢铁公司古滑坡为例[J].山地学报,2001,(02):175.
[2]刘正梁,孔纪名,周勇,等.镇胜高速公路晴隆古滑坡成因特点及防治对策[J].山地学报,2008,(06):727.

备注/Memo

备注/Memo:
收稿日期(Received date):2015-03-25; 修回日期(Accepted):2015-04-18。 基金项目(Foundation item):国家自然科学基金面上项目(批准号:41072231),地质灾害防治与地质环境保护国家重点实验室方向性项目(No:40100-00002219)。[This research is supported by surface of the State Natural Science Fund projects(Grant No.41072231)and the directional project of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Grant No:40100-00002219).] 作者简介(Biography):许声夫(1990-),男,汉族,四川资阳人,硕士研究生,主要从事区域地质构造稳定性及地震地质灾害研究。[Shengfu Xv,(1990-),Male,the Han Nationality,born in Ziyang of Sichuan province,Post-Graduate,Mainly engaged in the study of regional tectonic stability and seismic geological disasters.]E-mail:xcdfoxyx@foxmail.com *通信作者(Corresponding author):李渝生(1956-),男,汉族,四川成都人,教授,主要从事地质灾害与区域稳定性方面的研究工作。[Yusheng Li(1956-),Male,Born in Chengdu,Professor,Mainly engaged in the research of geological disasters and regional stability.]E-mail:liyusheng@cdut.cn
更新日期/Last Update: 1900-01-01