Formation Mechanism and Control Measures of Sliding Surface about Bedding Slope Containing Weak Interlayer

Abstract

During the mining process of Hami open-pit coal mine, a large number of cracks appeared on the ground surface near the top of the end slope, which affected the stability of the slope and the subsequent safe mining of resources. By analyzing the deformation of rock stratum, the position of weak interlayer in the slope was determined. Considering the rock mass with weak interlayer as a complete mechanical system, the mechanical model of the rock mass system with weak interlayer was established, and the evaluation index of rock failure degree before slope instability was proposed. The failure mode of slope with weak interlayer is as follows: sliding failure-cutting layer failure-tension failure. The safety factor of slope decreases first and then increases with the increase of the depth of the weak interlayer, and gradually decreases with the increase of the inclination of the weak interlayer. The pressing foot of slope can be used in landslide control of slope with weak interlayers, and the optimal pressing foot solution to ensure the safe mining of final slope coal resources was determined to be a pressing foot height of 35 m and pressing foot width of 20 m.

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Acknowledgements

Financial support for this work was provided by the Outstanding Scholar of Yuezaki (800015Z1179), and the National Key Research and Development Program of China (2018YFC1504802), and the Fundamental Research Funds for the Central Universities (2009QZ03), and the National Natural Science Foundation of China (51474220).

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Correspondence to Hongbao Zhao.

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Wang, T., Zhao, H., Liu, Y. et al. Formation Mechanism and Control Measures of Sliding Surface about Bedding Slope Containing Weak Interlayer. KSCE J Civ Eng 24, 2372–2381 (2020). https://doi.org/10.1007/s12205-020-2117-4

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Keywords

  • Weak interlayer
  • Crack
  • Failure mode
  • Slope stability
  • Pressing foot