›› 2010, Vol. 31 ›› Issue (S1): 324-329.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Analysis of sliding mechanism of accumulation horizon landslide under rainfall condition

WU Huo-zhen, FENG Mei-guo, JIAO Yu-yong, LI Hai-bo   

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2010-04-23 Online:2010-08-10 Published:2010-09-09

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Abstract:

According to a certain accumulation horizon landslide in the logistics park, the geologic structure characteristic and the landslide types were analyzed. Based on the analysis result, the dynamic stability characteristic of the landslide under rainfall was analyzed; and the sliding mechanism and cause were revealed by the theory of unsaturated soil. It considered that the landslide body on groove of the slope surface, steeper terrain, and loose structure and low intensity of the surface accumulation horizon provided convenient conditions for landslide formation. With the rainfall duration increasing, the rainfall was infiltrated into landslide along the surface of the accumulation mass and formed conflux transfixion on the contacting interface between the soil and rock; so the backwater on the contacting interface was formed. As we had known that the backwater decreased the mechanical properties of the landslide and induced the dynamic uplift force in the landslide. Meanwhile, with the rainfall filling the crack and the weak structural plane continually, the dynamic expanding force was induced and the tension crack was enlarged; and the deformation of the accumulation mass was intensified. Finally, the sliding of the landslide was induced.

Key words: accumulation horizon landslide, sliding mechanism, rainfall, unsaturation

CLC Number: 

  • TU 434
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