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Force and energy equilibrium-based analytical method for progressive failure analysis of translational rockslides: formulation and comparative study

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Abstract

Massive rockslides are recognized as one of the most catastrophic hazards due to their rapid sliding velocity and high destructiveness. This study focuses on the progressive failure analysis of translational rockslides (PFTRs) on a cataclinal dip slope, whose shear failure develops mainly along the bedding plane of the underlying strata from the head to the toe of the rockslide. A force and energy equilibrium-based analytical method (FEE) is proposed, combining shear failure propagation and strength degradation, to analyse the stability based on static equilibrium and displacement based on energy equilibrium. A representative translational rockslide, the Shanshucao landslide in the Three Gorges Reservoir, China, is used as a case study. The results of the FEE are validated by comparison with the revised rigid limit equilibrium method (RLEM) and numerical simulation (NS). According to the RLEM and NS, when the shear failure of the slide surface develops to a position with a horizontal distance of approximately 225 m, the rockslide steps into the critical state from partial progressive deformation to failure of the entire rockslide. The FEE obtains a similar result, and the corresponding horizontal distance is 200 m. The rockslide displacement calculated by the FEE agrees well with the results of the NS. Before the critical state, the rockslide displacement is less than 0.05 m; afterwards, the displacement of the entire rockslide obviously increases. In addition, it is proven that the hydrostatic pressure in subvertical tension cracks and the post-failure shear surfaces are the primary impetus for accelerated deformation of rockslides and further development of failure surfaces. The validated results indicate that the FEE is a straightforward and effective method to analyse both the stability and displacement of PFTR, which is significant for rockslide early warning and risk mitigation. In addition, the FEE still has limitations with regard to generalization of the landslide geo-mechanical model and the method validation with observational data of historical events.

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Acknowledgements

We are grateful to Zhang S. and Yu X. for taking part in the field investigation. We also thank the assistance of the Research Center of Geohazard Monitoring and Warning in the Three Gorges Reservoir, China.

Funding

This research is supported by the National Natural Science Foundation of China [Grant Nos. 42172318 and 41572256].

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Correspondence to Bo Chai.

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Du, J., Shi, X., Chai, B. et al. Force and energy equilibrium-based analytical method for progressive failure analysis of translational rockslides: formulation and comparative study. Landslides 20, 475–488 (2023). https://doi.org/10.1007/s10346-022-01980-x

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