Does vertical seismic force play an important role for the failure mechanism of rock avalanches? A case study of rock avalanches triggered by the Wenchuan earthquake of May 12, 2008, Sichuan, China

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• 作者：Ping Sun (12) sunpingcgs@gmail.com
  Yue-ping Yin (3) yyueping@mail.cgs.gov.cn
  Shu-ren Wu (12)
  Li-wei Chen (4) clw5070@163.com
• 关键词：Wenchuan earthquake – ; Rock avalanche – ; Vertical peak acceleration – ; Failure mechanism – ; Finite difference method
• 刊名：Environmental Earth Sciences
• 出版年：2012
• 出版时间：July 2012
• 年：2012
• 卷：66
• 期：5
• 页码：1285-1293
• 全文大小：1.3 MB
• 参考文献：1. Anderson JC, Bertero VV (1973) Effect of gravity load and vertical ground acceleration on the seismic response of multistory frames. In: Proceedings of 5th world conference on earthquake engineering
  2. FLAC (Fast Lagrangian Analysis of Continua) User’s Guide (2005) Version 5.0. Itasca Consulting Group, Inc
  3. Li X, Siming HE (2009) Seismically induced slope instabilities and the corresponding treatments: the case of a road in the Wenchuan earthquake hit region. J Mt Sci 6(1):96–100
  4. Liang Q, Han W, Zhao S (2007) Influence of vertical seismic action on seismic dynamic failure of jointed rock mass. Northwest Seismol J 29(4):307–313
  5. Liao ZP, Liu JB (1992) Basic problems of finite element simulation on fluctuations. Sci China B Ser 35(8):874–882 (in Chinese)
  6. Morgenstern NR, Price VE (1965) The analysis of the stability of general slip surface. Geotechnique 23(1):85–100
  7. Qian PF (1983) Vertical seismic force. Earthq Eng Eng Vibration 3(2):44–54
  8. Qian PF (1988) The serious effect of vertical seismic force. J Seismol Res 6(2):227–250
  9. Sun P, Yin YP, Wu SR et al (2009a) Experimental study on shear strength of rocks from Donghekou landslide in dried state and saturated state. Geol Bull China 28(8):37–41 (in Chinese)
  10. Sun P, Yin YP, Wu SR et al (2009b) Experimental study on shear strength of rocks from Donghekou landslide in Qingchuan County, Sichuan Province, China. Geol Bull China 28(8):37–41 (in Chinese)
  11. Sun P, Zhang YS, Yin YP et al (2009c) Discussion on long run-out sliding mechanism of Donghekou landslide-debris flow. J Eng Geol 17(6):737–744 (in Chinese)
  12. Wang FW, Cheng QG, Lynn H et al (2009) Preliminary investigation of some large landslides triggered by Wenchuan earthquake in 2008, Sichuan Province, China. Landslides 6(1):47–54
  13. Xu Q, Huang RQ (2008) Kinetics characteristics of large landslides triggered by May 12th Wenchuan earthquake. J Eng Geol 16(6):721–729
  14. Yin YP, Zheng WM, Li XC et al. (2008) Catastrophic landslides associated with the M8.0 Wenchuan earthquake. Bull Eng Geol Environ 70:15–32
  15. Yin YP, Pan GT, Liu YP et al (2009) Great Wenchuan earthquake: seismogeology and landslide hazards. Geology Press, Beijing
  16. Zhang LY, Zheng YR, Zhao SY et al. (2003) Study on the calculation accuracy of factor of slope stability with the finite element strength reduction method. J Hydraul Eng 1:21–26
  17. Zheng YR, Chen Y, Wang GX et al (2007) Engineering treatment of slope and landslide. China Communications Press, Beijing
  18. Zhou ZH, Zhou YN, Lu T et al (2003) Study on the characteristics of vertical ground motion. Earthq Eng Eng vibration 23(3):25–29
• 作者单位：1. Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resources, Beijing, 100081 China2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081 China3. China Institute of Geo-Environment Monitoring, Beijing, 100081 China4. China Nuclear Power Engineering Corporation Ltd, Beijing, 100840 China
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

The Wenchuan earthquake triggered 15,000 rock avalanches, rockfalls and debris flows, causing a large number of causalities and widespread damage. Similar to many rock avalanches, field investigations showed that tensile failure often occurred at the back edge. Some soil and rock masses were moved so violently that material became airborne. The investigation indicates that this phenomenon was due to the effect of a large vertical seismic motion that occurred in the meizoseismal area during the earthquake. This paper analyses the effect of vertical earthquake force on the failure mechanism of a large rock avalanche using the Donghekou rock avalanche as an example. This deadly avalanche, which killed 780 people, initiated at an altitude of 1,300 m and had a total run-out distance of 2,400 m. The slide mass is mainly composed of Sinian limestone and dolomite limestone, together with Cambrian slate and phyllite. Static and dynamic stability analysis on the Donghekou rock avalanche has been performed using FLAC finite difference method software, under the actual seismic wave conditions as recorded on May 12, 2008. The results show that the combined horizontal and vertical peak acceleration caused a higher reduction in slope stability factor than horizontal peak acceleration alone. In addition, a larger area of tensile failure at the back edge of the avalanche was generated when horizontal and vertical peak acceleration were combined than when only horizontal acceleration was considered. The force of the large vertical component of acceleration was the main reason rock and soil masses became airborne during the earthquake.