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Scientific, Technological and Production Journal
ISSN 2079–3332 (print)
ISSN 3034-6835 (online)
founded in 2001

Failure mechanism and stability control of roadways under challenging geological conditions

Original articles: 2025 No 5

Failure mechanism and stability control of roadways under challenging geological conditions

DOI: 10.56195/20793332-2025-25-6-32-39

Read in pdf L. Lu1,2
  1. China University of Mining and Technology-Beijing, China
  2. China-Russia Dynamics Research Center, China University of Mining and Technology-Beijing, China
p. 32-39, No.6/2025
Abstract:
In special geological zones formed by coal seam spontaneous combustion, burnt rock exhibits a loose structure, welldeveloped joints and fissures, and significantly reduced strength, resulting in considerable challenges for roadway stability control. This paper investigates the deformation and failure characteristics and stability control mechanisms of roadway surrounding rock affected by thermal alteration, using the 3202 return airway of Dawan Coal Mine as a case study. Based on the Hoek-Brown strength criterion and elastic-plastic mechanics theory, a stability analysis model for burnt rock roadway surrounding rock was established. The extent of the loosening zone was verified through UDEC numerical simulation and borehole observations, revealing a loosening zone depth ranging from approximately 3.1 m to 4.2 m. To address these challenges, this paper proposes a comprehensive control technology based on multi-stage coordinated support, termed the Reinforcement-Anchorage-Constraint (RAC) system. This system integrates grouting reinforcement (Reinforcement), bolt and cable support (Anchorage), and metal shed support (Constraint) to ensure roadway stability. Field monitoring results demonstrate that the roof-to-floor convergence is 71 mm and the ribs convergence is 27 mm, indicating overall roadway stability. The research findings provide both theoretical foundation and practical engineering guidance for stability control of roadways in burnt rock zones.
Keywords:
Burnt rock, Roadway stability, Hoek-Brown criterion, Combined support system, Field test
For citation:
Lu L. Failure mechanism and stability control of roadways under challenging geological conditions. Mine Surveying and Subsurface Use. 2025;25(6):32-39. https://doi.org/10.56195/20793332-2025-25-6-32-39.
Information about the authors:
  1. Lin Lu - PhD Candidate, China University of Mining and Technology (Beijing), 100083, Beijing, China; e-mail: linlu_cumtb@163. com
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