Stability of stepped sliding of bedding rock slopes with discontinuous joints

LI De-jian; JIA Wen-tao; CHENG Xiao; ZHAO Lian-heng; ZHANG Ying-bin; YU Peng-cheng

doi:10.11779/CJGE202211019

Volume 44 Issue 11

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Chinese Journal of Geotechnical Engineering > 2022 > 44(11): 2125-2134. > DOI: 10.11779/CJGE202211019

LI De-jian, JIA Wen-tao, CHENG Xiao, ZHAO Lian-heng, ZHANG Ying-bin, YU Peng-cheng. Stability of stepped sliding of bedding rock slopes with discontinuous joints[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(11): 2125-2134. DOI: 10.11779/CJGE202211019

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Stability of stepped sliding of bedding rock slopes with discontinuous joints

1.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
Institute for Disaster Management and Reconstruction, MOE Key Laboratory of Deep Earth Science and Engineering, Sichuan University, Chengdu 610065, China
3.
School of Civil Engineering, Key Laboratory of Heavy-Haul Railway Engineering Structure, Ministry of Education, Central South University, Changsha 410075, China

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Received Date: November 15, 2021
Available Online: December 08, 2022

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Abstract

Abstract

The bedding rock landslides with stepped sliding surface are common in engineering, and the characteristics of rock bridges and joints are very important to the formation of stepped sliding surface. The weakening characteristics of the strength parameters of rock bridges and joints are considered. The models for stability of stepped sliding of bedding slopes are established. The results show that the accuracy of the model is verified by comparing with the planar failure model. In addition, the fracture connectivity rate k_Y, basic friction angle φ_b, roughness coefficient JRC and weakening coefficient K_c have significant influences on F_s. In this mode, the greater β₃ is, the more significant the reduction of F_s is, and the more unstable the slope is. In addition, the excavation times and slope angle have significant influences on the slope stability. The difference rate between the proposed method and the limit equilibrium solution is less than 1%. In some cases, when the joint surfaces are exposed by excavation, F_s is significantly reduced (the reduction of 22.8% when β=53°), which easily leads to the occurrence of landslides. Meanwhile, with an increase in angle β₁ of tensile cracks and height h_w of water, F_s significantly decreases. The water pressure is more significant when the outlets are blocked, and the rock slope is most unstable.
- joint rock slope,
- stepped sliding,
- weakening coefficient,
- step-type slope surface,
- water pressure

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References (27)

References

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