13 Nov 2023
 | 13 Nov 2023
Status: this preprint is currently under review for the journal NHESS.

Analysis of three-dimensional slope stability combined with rainfall and earthquake

Jiao Wang, Zhangxing Wang, Guanhua Sun, and Hongming Luo

Abstract. In the current context of global climate change, geohazards such as earthquakes and extreme rainfall pose a serious threat to regional stability. We investigate a three-dimensional slope dynamic model under earthquake action, derive the calculation of seepage force and the normal stress expression of slip surface under seepage and earthquake, and propose a rigorous overall analysis method to solve the safety factor of slopes subjected to combined with rainfall and earthquake. The accuracy and reliability of the method is verified by two classical examples. Finally, the effects of soil permeability coefficient, porosity and saturation on slope stability under rainfall in a project located in the Three Gorges Reservoir Area are analyzed. The safety evolution of the slope combined with both rainfall and earthquake is also studied. The results indicate that porosity has a greater impact on the safety factor under rainfall conditions, while the influence of permeability coefficient and saturation is relatively small. With the increase of horizontal seismic coefficient, the safety factor of the slope decreases significantly. The influence of earthquake on slope stability is significantly greater than that of rainfall. The corresponding safety factor when the vertical seismic action is vertically downward is smaller than that when it is vertically upward. When considering both horizontal and vertical seismic effects, slope stability is lower.

Jiao Wang et al.

Status: open (until 25 Dec 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2023-181', Anonymous Referee #1, 20 Nov 2023 reply
    • AC1: 'Reply on RC1', Jiao Wang, 23 Nov 2023 reply
  • RC2: 'Comment on nhess-2023-181', Anonymous Referee #2, 26 Nov 2023 reply
    • AC2: 'Reply on RC2', Jiao Wang, 30 Nov 2023 reply

Jiao Wang et al.

Jiao Wang et al.


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Short summary
By a simplified formula linking rainfall and groundwater level, the rise of the phreatic surface within the slope can be obtained. Then, we derive the calculation of the seepage force. A global analysis method that considers both seepage and seismic forces is proposed to determine the safety factor of slopes subjected to the combined effect of rainfall and earthquake. The reliability of the proposed method is also verified with two examples combining software calculations and previous results.