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Landslides

, Volume 13, Issue 1, pp 9–23 | Cite as

Heavy-rainfall-induced catastrophic rockslide-debris flow at Sanxicun, Dujiangyan, after the Wenchuan Ms 8.0 earthquake

  • Yueping Yin
  • Yuliang Cheng
  • Jingtao Liang
  • Wenpei Wang
Original Paper

Abstract

This paper uses the catastrophic rockslide at Sanxicun village in Dujianyan city as an example to investigate the formation mechanism of a rapid and long run-out rockslide-debris flow of fractured/cracked slope, under the application of a rare heavy rainfall in July 2013. The slope site could be affected by the Wenchuan Ms 8.0 Earthquake in 2008. The sliding involved the thick fractured and layered rockmass with a gentle dip plane at Sanxicun. It had the following formation process: (1) toppling due to shear failure at a high-level position, (2) shoveling the accumulative layer below, (3) forming of debris flow of the highly weathered bottom rockmass, and (4) flooding downward along valley. The debris flow destroyed 11 houses and killed 166 people. The run-out distance was about 1200 m, and the accumulative volume was 1.9 × 106 m3. The rockslide can be divided into sliding source, shear-shoveling, and flow accumulative regions. The stability of this fractured rock slope and the sliding processes are discussed at four stages of cracking, creeping, separating, and residual accumulating, under the applications of hydrostatic pressure and uplift pressure. This research also investigates the safety factors under different situations. The double rheological model (F-V model) of the DAN-W software is utilized to simulate the kinematic and dynamic processes of the shear-shoveling region and debris flow. After the shear failure occurred at a high-level position of rock, the rockslide moved for approximately 47 s downward along the valley with a maximum velocity of 35 m/s. This is a typical rapid and long run-out rockslide. Finally, this paper concludes that the identification of the potential geological hazards at the Wenchuan mountain area is crucial to prevent catastrophic rockslide triggered by heavy rainfall. The identified geological hazards should be properly considered in the town planning of the reconstruction works.

Keywords

Wenchuan Ms 8.0 earthquake Heavy rainfall Rockslide Debris flow 

Notes

Acknowledgments

The authors express a gratitude to Professor Zhongqi Yue from Hong Kong University for his time on English editing of this paper.

References

  1. Fan XM, Xu Q, Zhang ZY (2009) The genetic mechanism of a translational rockslide. Bull Eng Geol Environ 68:231–244CrossRefGoogle Scholar
  2. Feng Z, Yin YP, Li B (2012) Centrifuge modeling of apparent dip slide from oblique thick bedding rockslide. Chin J Rock Mech Eng 31(5):890–897 (in Chinese)Google Scholar
  3. GEO-SLOPE International Ltd (2008) Stability modeling with SEEP/W 2007—an engineering methodology, 3rd edn. Calgary, AlbertaGoogle Scholar
  4. Hungr O (1995) A model for the run out analysis of rapid flow slides, debris flows, and avalanches. Can Geotech J 32:610–623CrossRefGoogle Scholar
  5. Hungr O (2008) Simplified models of spreading flow of dry granular material. Can Geotech J 45(8):1156–1168CrossRefGoogle Scholar
  6. Hungr O (2010) User’s manual for DAN-W Dynamic analysis of landslides. 4195 Almondel Rd., West Vancouver, B.C., Canada, V7V 3L6Google Scholar
  7. Hungr O, Evans SG (2004) Entrainment of debris in rock avalanches: an analysis of a long-runout mechanism. Geol Soc Am Bull 116:1240–1252CrossRefGoogle Scholar
  8. Hungr O, McDougall S (2009) Two numerical models for rockslide dynamic analysis. Comput Geosci 35:978–992CrossRefGoogle Scholar
  9. Ji SW, Zhang ZY, Liu HC (2000) The mechanism of deformation and failure for the slope composed of nearly horizontal competent and incompetent intercalated rock mass strata. Chin J Geol Hazard Control 11(9):49–53 (in Chinese)Google Scholar
  10. Li YQ (1998) Master Zhang Daqian and Mt. Qiangcheng. Sichuan Today 11(4):32–34Google Scholar
  11. Qi C, Xing AG, Yin YP (2012) Numerical simulation of Dynamic behavior of Donghekou rockslide–debris avalanche. J Eng Geol 20(3):334–339Google Scholar
  12. Quan LB, Vangelsten BV, Liu ZQ, Eidsvig U and Nadim F (2013) Landslides induced by the interaction of an earthquake and subsequent rainfall. A spatial and temporal model. Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, pp 2237–2240Google Scholar
  13. Tang C, Zhu J, Li WL, Liang JT (2009) Rainfall-triggered debris flows following the Wenchuan earthquake. Bull Eng Geol Environ 68:187–194CrossRefGoogle Scholar
  14. Tang C, Zhu J, Ding J (2011) Catastrophic debris flows triggered by a 14 August 2010 rainfall at the epicenter of the Wenchuan Ms8.0 earthquake. Landslides 8:485–497CrossRefGoogle Scholar
  15. Wang ZJ, Wang CG, Wang K (2012) Research on mechanism of rockslide of nearly horizontal soft rock slope caused by wedge-shape cracking expansionary force. J Railw Eng Soc No 12:36–41 (in Chinese)Google Scholar
  16. Xu Q, Fan XM, Dong XJ (2012) Characteristics and formation mechanism of a catastrophic rainfall-induced rock avalanche–mud flow in Sichuan, China. Landslides 9:143–154CrossRefGoogle Scholar
  17. Yin YP (2011) Recent catastrophic landslides and mitigation in China. J Rock Mech Geotech Eng 3(1):10–18CrossRefGoogle Scholar
  18. Yin YP, Wang FW, Sun P (2009) Landslide hazards triggered by the 2008 Wenchuan Ms8.0 earthquake, Sichuan, China. Landslides 6(2):139–152CrossRefGoogle Scholar
  19. Yin YP, Sun P, Zhang M, Li B (2011) Mechanism on apparent dip sliding of oblique inclined bedding rockslide at Jiweishan, Chongqing, China. Landslides 8(1):49–65CrossRefGoogle Scholar
  20. Yu B, Wu YF, Chu SM (2014) Preliminary study on the effect of earthquake to the rainfall threshold of debris flows. Eng Geol. doi: 10.1016/j.enggeo.2014.04.007 Google Scholar
  21. Zhang M, Yin Y, Hu R, Wu S, Zhang Y (2011) Ring shear test for transform mechanism of slide-debris flow. Eng Geol 118:56–62CrossRefGoogle Scholar
  22. Zhao X, Kang JW, Jiang J (2009) Strength index determine methods of the sliding zone soil in rockslide investigation. J Geol Hazards Environ Preserv 20(1):43–49 (in Chinese)Google Scholar
  23. Zhao CY, Zhang Q, Yin YP, Zhong L (2013) Pre-, co-, and post-rockslide analysis with ALOS/PALSAR imagery data: a case study of Jiweishan rockslide, China. Nat Hazards Earth Syst Sci 13:2851–2861CrossRefGoogle Scholar
  24. Zhou W, Tang C (2013) Rainfall thresholds for debris flow initiation in the Wenchuan earthquake-stricken area, southwestern China. Landslides. doi: 10.1007/s10346-013-0421-5 Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Yueping Yin
    • 1
  • Yuliang Cheng
    • 2
  • Jingtao Liang
    • 2
  • Wenpei Wang
    • 1
  1. 1.China Institute of Geo-Environmental MonitoringBeijingChina
  2. 2.Sichuan Geological SurveyChengduChina

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