|Table of Contents|

Numerical Analysis on Motion Mechanism of Highspeed and Long Runout Landslide by Wenchuan Earthquake——Taking Xiejiadianzi Landslide as an Example(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2010年第03期
Page:
277-287
Research Field:
水资源与环境
Publishing date:

Info

Title:
Numerical Analysis on Motion Mechanism of Highspeed and Long Runout Landslide by Wenchuan Earthquake——Taking Xiejiadianzi Landslide as an Example
Author(s):
SU Sheng-rui1 ZHANG Yong-shuang2 LI Song1 HAO Li-li1 WANG Kai1 MEI Hai1
(1.School of Geological Engineering and Surveying, Chang'an University, Xi'an 710054, Shaanxi, China; 2.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China)
Keywords:
landslide numerical simulation motion mechanism Xiejiadianzi Wenchuan Earthquake
PACS:
P642.22
DOI:
-
Abstract:
In view of Xiejiadianzi highspeed and long runout landslide caused by Wenchuan Earthquake, based on the investigation and analysis on the spot, a two-dimension discrete element numerical simulation model was built, numerical simulation was done by 2D-Block software. Furthermore, motion characteristics of corresponding geologic body at different stages through the thorough analysis of tracking block were discussed. The results indicated that Xiejiadianzi landslide experienced four periods: the instantaneously sliding stage, the intensive colliding cushion stage, the scraping slow down stage and the deposit stage. In order to reveal the occurence regularity of highspeed landslide triggered by Wenchuan Earthquake, the influence laws of three factors including earthquake magnitude, the topography of landslope and the size of rockmass on the landslope to the highspeed landslide were studied. Earthquake magnitude had great influence on the set-out, deformation and destruction and movement of landslope. The greater the earthquake magnitude, the faster the accelerated speed and speed of the sliding, the easier of forming high speed and long runout landslide. The topography of slope also had greater effect on the movement of the sliding mass. Under the certain magnitude and rock mechanics parameters, the size of the rockmass on the landslope had a certain effect on the set-out, deformation and destruction and movement of landslope. With the increasing of the size of rockmass, the speed of the sliding decreased in each stage. However, when the rockmass was broken, it was hard to cast for the sliding movement although it could move. The set-out mechanisms of landslide were summarized as three effects: the progressive and deformation effect, the set-out effect and the acceleration effect.

References:

[1] 殷跃平,潘桂棠,刘宇平,等.汶川地震地质与滑坡灾害概论[M].北京:地质出版社,2009.
[2] 彭建兵,马润勇,范 文,等.汶川大震的科学思考[J].地球科学与环境学报,2009,31(1):1-29.
[3] 黄润秋,李为乐.汶川大地震触发地质灾害的断层效应分析[J].工程地质学报, 2009,17(1):19-28.
[4] 王 涛,马寅生,龙长兴,等.四川汶川地震断裂活动和次生地质灾害浅析[J].地质通报,2008,27(11):1913-1922.
[5] 伍法权,胡瑞林,岳中琦,等. 5·12汶川地震地质灾害[M].北京:地质出版社,2009.
[6] 徐锡伟,闻学泽,叶建青,等.汶川Ms 8.0地震地表破裂带及其发震构造[J].地震地质,2008,30(3):597-629.
[7] 刘红岩,王 明.节理岩质边坡稳定性的离散元分析[J].金属矿山,2008(9):15-18.
[8] 毛彦龙,胡广韬,毛新虎,等.地震滑坡启程剧动的机理研究及离散元模拟[J].工程地质学报,2001,9(1):74-80.
[9] 陈晓兰,卢国胜.地震诱发滑坡的机理研究[J].安徽农业科学,2009,37(18):8612-8613.
[10] Battis J.Regional Modification of Acceleration Attenuation Functions[J].Bulletin of the Seismological Society of America,1981,71(4):1309-1321.
[11] Chandra U.Attenuation of Intensities in the United States[J].Bulletin of the Seismological Society of America,1979,69(6):2003-2024.

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Last Update: 2010-09-20