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Journal of Mountain Science

, Volume 7, Issue 3, pp 282–290 | Cite as

Analysis of earthquake-triggered failure mechanisms of slopes and sliding surfaces

  • Jian Wang
  • Lingkan Yao
  • Arshad Hussain
Article

Abstract

Earthquake-induced landslides along the Dujiangyan-Yingxiu highway after the Ms 8.0 Wenchuan earthquake in 2008 were investigated. It was found that: (1) slopes were shattered and damaged during the earthquake and open tension cracks formed on the tops of the slopes; (2) the upper parts of slopes collapsed and slid, while the lower parts remained basically intact, indicating that the upper parts of slopes would be damaged more heavily than the lower parts during an earthquake.

Large-scale shaking table model tests were conducted to study failure behavior of slopes under the Wenchuan seismic wave, which reproduced the process of deformation and failure of slopes. Tension cracks emerged at the top and upper part of model, while the bottom of the model remained intact, consistent with field investigations. Depth of the tension crack at the top of model is 32 cm, i.e., 3.2 m compared to the prototype natural slope with a height of 14 m when the length scale ratio (proto/model) is 10. Acceleration at the top of the slope was almost twice as large as that at the toe when the measured accelerations on shaking table are 4.85 m/s2 and 6.49 m/s2, which means that seismic force at the top of the slope is twice the magnitude of that at the toe.

By use of the dynamic-strength-reduction method, numerical simulation was conducted to explore the process and mechanism of formation of the sliding surface, with other quantified information. The earthquake-induced failure surfaces commonly consist of tension cracks and shear zones. Within 5 m from the top of the slope, the dynamic sliding surface will be about 1 m shallower than the pseudo-static sliding surface in a horizontal direction when the peak ground acceleration (PGA) is 1 m/s2; the dynamic sliding surface will be about 2 m deeper than the pseudo-static sliding surface in a horizontal direction when the PGA is 10 m/s2, and the depths of the dynamic sliding surface and the pseudo-static sliding surface will be almost the same when the PGA is 2 m/s2.

Based on these findings, it is suggested that the key point of anti-seismic design, as well as for mitigation of post-earthquake, secondary mountain hazards, is to prevent tension cracks from forming in the upper part of the slope. Therefore, the depth of tension cracks in slope surfaces is the key to reinforcement of slopes. The depth of the sliding surface from the pseudo-static method can be a reference for slope reinforcement mitigation.

Key words

Subgrade engineering slope failure mechanism shaking table model test seismic sliding surface Wenchuan earthquake 

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References

  1. Baker, R., Shukha, R., Operstein, V., et al. 2006. Stability charts for pseudo-static slope stability analysis. Soil Dynamics and Earthquake Engineering 26(9):813–823.CrossRefGoogle Scholar
  2. CHEN, T. C., LIN, M. L., HUNG, J. J. 2004. Pseudostatic analysis of Tsao-Ling rockslide caused by Chi-Chi earthquake. Engineering Geology 71(1):31–47CrossRefGoogle Scholar
  3. Crespellanit, T., Madiaic, Vannuchi, G. 1998. Earthquake destructiveness potential factor and slope stability. Geotechnique 48(3): 411–419.CrossRefGoogle Scholar
  4. CUI Peng, CHEN Xiaoqing, ZHU Yingyan, et al. 2009a. The Wenchuan earthquake(May 12, 2008), Sichuan Province, China, and resulting geohazards. Nat Hazards. DOI: 10.1007/s11069-009-9392-1.Google Scholar
  5. CUI Peng, ZHU Yingyan, Han Yongshun, et al. 2009b. The 12 May Wenchuan Earthquake-induced Landslide.Google Scholar
  6. Havenith, H. B., Vanini, M., Jongmans, D. 2003. Initiation of earthquake-induced slope failure: influence of topographical and other site specific amplification effects. Journal of Seismology 7(3): 397–412.CrossRefGoogle Scholar
  7. HUANG Runqiu. 2009. Mechanism and geomechanical modes of landslide hazards triggered by Wenchuan 8.0 earthquakes. Chinese Journal of Rock Mechanics and Engineering 28(6):1239–1248. (In Chinese)Google Scholar
  8. JIANG Liangwei, YAO Lingkan, WANG Jian. 2009. Similitude for shaking table model test on side slope relating to dynamic characteristics and strength 25(2): 1–7. (In Chinese)Google Scholar
  9. Jibson, R.W. and Keefer, D.K., 1988. Landslides Triggered by Earthquakes in the Central Mississippi Valley, Tennessee and Kentucky, U.S. Geological Survey Professional Paper 1336-c.Google Scholar
  10. Jibson, R.W., Keefer, D.K. 1993. Analysis of the seismic origin of landslides: examples from New Madrid seismic zone, Bulletin of Geological Society of America, Vol. 105. Pp. 521–536.CrossRefGoogle Scholar
  11. LI Xinpo, HE Siming. 2009. Seismically induced slope instabilities and the corresponding treatments: the case of a road in the Wenchuan earthquake hit region. Journal of Mountain Science 6(1):96–100.CrossRefGoogle Scholar
  12. LIN Meiling, WANG Guolong. 2006. Seismic slope behavior in a large-scale shaking table model test. Engineering Geology 86(2):118–133.CrossRefGoogle Scholar
  13. WANG Genlong, ZHANG Junhui, LIU Hongshuai. 2009. Investigation and preliminary analysis of geologic disasters in Beichuan county induced by Wenchuan earthquake. The Chinese Journal of Geological Hazard and Control 20(3):47–51. (In Chinese)Google Scholar
  14. WANG Fawu, CHENG Qiangong, 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.CrossRefGoogle Scholar
  15. Wilson, R. C., and Keefer, D. K. 1985. Prediction areal limits of earthquake-induced landslide, in Ziony, J. I., ed., Evaluating earthquake hazards in the Los Angeles region-An earth-science perspective: U.S. Geological Survey Professional Paper 1360. Pp. 316–345.Google Scholar
  16. Wright, S. G., Rathje, E. M. 2004. Triggering mechanisms of slope instability and their relationship to earthquakes and tsunamis. Pure and Applied Geophysics 160(11):1865–1877.CrossRefGoogle Scholar
  17. YAO Lingkan, CHEN Qiang. 2009. New research subjects on earthquake resistant techniques of line engineering extracted from “5.12” Wenchuan earthquake. Journal of Sichuan University (engineering science edition) 41(3):43–50. (In Chinese)Google Scholar
  18. Youd, T.L.1980. Ground Failure Displacement and Earthquake Damage to Buildings: American Society of Civil Engineers, Proceedings of the Specialty Conference on Civil Engineering and Nuclear Power, Vol. 2. Pp.7-6-1–7-6-26.Google Scholar
  19. ZHENG Yingren, YE Hailin, HUANG Runqiu. 2009. Analysis and discussion of failure mechanism and fracture surface of slope under earthquake. Chinese Journal of Rock Mechanics and Engineering 28(8):1714–1723. (In Chinese)Google Scholar

Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Jian Wang
    • 1
  • Lingkan Yao
    • 1
    • 2
    • 3
  • Arshad Hussain
    • 4
  1. 1.School of Civil EngineeringSouthwest Jiaotong UniversityChengduChina
  2. 2.MOE Key Laboratory of High-speed Railway EngineeringSouthwest Jiaotong UniversityChengduChina
  3. 3.Road and Railway Engineering Research InstituteSichuan Key Laboratory of Aseismic Engineering and TechnologyChengduChina
  4. 4.National University of Sciences and Technology (NUST)IslamabadPakistan

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