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Related Experiment Video

Updated: Oct 7, 2025

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Slope stability calculation method for highwall mining with open-cut mines.

Juyu Jiang1, Ye Lu2, Dong Wang3

  • 1College of Mines, Liaoning Technical University, Fuxin, 123000, Liaoning, China. jiangjuyu@lntu.edu.cn.

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|January 8, 2022
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Summary
This summary is machine-generated.

This study introduces target time pillar strength to improve highwall mining safety. It quantifies slope stability impacts, crucial for advancing this mining technology.

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Area of Science:

  • Geotechnical Engineering
  • Mining Engineering
  • Rock Mechanics

Background:

  • Slope stability is a critical challenge for highwall mining, particularly in high and steep end-slope conditions with residual coal.
  • Overlying strata can cause basal coal seam weakening, potentially shifting slope failure from circular to sliding modes.

Purpose of the Study:

  • To propose the concept of target time pillar strength based on required coal pillar service time.
  • To develop a quantitative method for assessing slope stability influenced by highwall mining operations.

Main Methods:

  • Creep tests were conducted to determine time-varying coal shear strength parameters under various loads, establishing a regression-based time-varying function.
  • Numerical modeling was employed to analyze the impact of bearing stress and target time strength on the yielding zone development in coal pillar ribs.
  • Discontinuous structural plane theory was used to categorize highwall mining lengths into goaf, yielding, and elastic zones.

Main Results:

  • Time-varying functions for coal shear strength parameters were established.
  • Temporal and spatial evolution patterns of weak layer shear strength parameters were determined.
  • Coefficients for the goaf, yielding, and elastic zones were identified.

Conclusions:

  • A novel slope stability calculation method based on rigid body-limit equilibrium theory was proposed.
  • The method quantifies the influence of highwall mining on slope stability, aiding in the promotion of the technology.
  • Understanding and managing coal pillar strength over time is essential for safe highwall mining.