Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (3): 980-988.doi: 10.16285/j.rsm.2019.0474

• Geotechnical Engineering • Previous Articles     Next Articles

A study of water content distribution and shallow stability of earth slopes subject to rainfall infiltration

SHI Zhen-ning1, 2, QI Shuang-xing3, FU Hong-yuan1, ZENG Ling3, HE Zhong-ming1, FANG Rui-min1   

  1. 1. School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China; 2. National Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha, Hunan 410114, Hunan, China; 3. School of Civil Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China
  • Received:2019-03-08 Revised:2019-07-31 Online:2020-03-11 Published:2020-05-26
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51908069, 51978084, 51838001, 51878070), the Open Fund of National Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology(kfj170103) and the Key Research and Development Program of Hunan Province(2019SK2171).

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Abstract: A rainfall infiltration test model which enables the measurement of the volumetric water content of soil is designed. The distribution and variation of the initial water content under rainfall infiltration are obtained through the test. Based on these results, a novel method for shallow stability analysis of earth slopes subject to rainfall infiltration is proposed by combining the unsaturated shear strength theory and the limit equilibrium method. The proposed method is then applied to study the stability of a soil slope along the Qili connecting line of Hang-Xin-Jing expressway. The main findings are as follows: the inverse proportion function characterized by water content distribution parameter A, correction coefficient λ and μ can be used to describe the initial water content distribution of soil in natural state; with the increase of A value, the initial stability of the slope decreases, and the sensitivity of rainfall to slope instability also decreases; when the rainfall intensity is the same, the greater the initial surface water content is the shorter the rainfall time needed to cause the slope instability; and when rainfall time is the same, the greater the initial surface water content is the smaller the rainfall intensity needed to cause the slope instability. Under the same groundwater level, the rainfall intensity is inversely proportional to the rainfall time needed to cause the slope instability.

Key words: rainfall infiltration, soil slope, water content distribution, slope stability, rainfall intensity-duration curve

CLC Number: 

  • TU42
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