Characteristics of strength reduction in the weak layer and large-slip displacement of the cut slope on the Fushun west open-pit mining area

TAO Ze; SUN Chuang; JIN Chunzhe; LIU Xiaolong; LI Dong

doi:10.16031/j.cnki.issn.1003-8035.202205016

2023 Vol. 34, No. 3

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Article navigation > The Chinese Journal of Geological Hazard and Control > 2023 > 34(3): 31-39

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TAO Ze, SUN Chuang, JIN Chunzhe, LIU Xiaolong, LI Dong. Characteristics of strength reduction in the weak layer and large-slip displacement of the cut slope on the Fushun west open-pit mining area[J]. The Chinese Journal of Geological Hazard and Control, 2023, 34(3): 31-39. doi: 10.16031/j.cnki.issn.1003-8035.202205016

Citation:

TAO Ze, SUN Chuang, JIN Chunzhe, LIU Xiaolong, LI Dong. Characteristics of strength reduction in the weak layer and large-slip displacement of the cut slope on the Fushun west open-pit mining area[J]. The Chinese Journal of Geological Hazard and Control, 2023, 34(3): 31-39. doi: 10.16031/j.cnki.issn.1003-8035.202205016

Characteristics of strength reduction in the weak layer and large-slip displacement of the cut slope on the Fushun west open-pit mining area

School of Civil Engineering, Liaoning University of Engineering and Technology, Fuxin , Liaoning　123000, China

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Corresponding author: SUN Chuang, sunchuang88@163.com

Received Date: 13 May 2022

Revised Date: 23 July 2022

Publish Date: 25 June 2023

Abstract

Abstract

The strength attenuation characteristics of the weak interlayers are one of the key factors leading to instability of the bedding rock slopes. In this study, the Nanbang slope of Fushun west open-pit mine was selected as the research object. A two-dimensional discrete element model of the Nanbang bedding slope was established using the UDEC numerical simulation method in combination with the discrete element theory, and the strength attenuation characteristics and large deformation law of the weak layer were studied. The residual strength decay curve of the weak layer over time was obtained by fitting the results of triaxial tests conducted under different confining pressures, and the FISH language was used to implement the attenuation of weak layer strength during numerical calculations according to the fitting equation. The numerical simulation results showed that deformation first occurred at the toe of the slope. As excavation continued, the strength of the weak layer gradually decreased, resulting in the trailing edge of the slope top being pulled apart, and the original stress balance being destroyed. Eventually, the landslide body slides along the weak layer. By establishing a backfilling numerical model for slope stability, it was found that after backfilling with a presser foot for 100 m, the slope stability coefficient had significantly improved, and the slope was in a basically stable state.
- layered slope /
- numerical simulation /
- discrete element /
- weak interlayer /
- strain softened

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References

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