›› 2013, Vol. 34 ›› Issue (S2): 247-251.

• Geotechnical Engineering • Previous Articles     Next Articles

On effective rainfall of slope instability

JIAN Wen-bin1,2，XU Xu-tang2，ZHENG Min-zhou1,2，LIU Kan1，LAI Shu-qin1   

  1. 1. Fujian Provincial Key Laboratory of Geological Hazards, Fuzhou 350002, China; 2. Institute of Geotechnical and Geological Engineering, Fuzhou University, Fuzhou 350108, China
  • Received:2013-04-16 Online:2013-11-11 Published:2013-11-19

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Abstract: The shallow instability of granite residual soil slope could easily induced by rainfall. Based on the analyses of influence of rainfall on the water content of slope soil, the effective rainfall resulting in soil from unsaturated to saturated condition is derived from the relationship between saturation and water content. Results show that not all rainfall will cause the instability of soil slope, and only when the soil saturation caused by rainfall infiltration reaches a certain degree the slope fails. There exists a critical depth in the unsaturated and saturated zone of slope above which the rainfall infiltration leads to a transition in soil from unsaturated to saturated, different shear strength could be used to calculate the stability of soil which was divided into fluctuation two parts by the critical depth. The soil unsaturated zone and saturated zone can be taken to calculate the stability of the soil condition. The results are useful for determining rainfall threshold of slope instability, so as to further understand the mechanism of landslide instability and landslide prediction.

Key words: soil slope, effective rainfall, critical depth

CLC Number: 

  • TU443
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