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Numerical Simulation Study on Wall-Rock Deformation Mechanism in Non-Pillar Sublevel Caving Mining Tunnel

Excerpt

The secondary stress distribution and deformation mechanism of excavated mining tunnel of −62m and −74m in Daye mine was studied in the paper. Firstly, the wall-rock was compartmentalized to different engineering geology group and mechanical parameters of wall-rock were determined based on engineering geological exploration and rock mechanics test. Then the state of stress and strain of excavated tunnel was simulated by FLAC3D software, the wall-rock deformation mechanism was analyzed too. The numerical simulation results were validated by convergence monitoring data that obtained in −74m mining tunnel. Studied results show that the range of secondary stress distribution exist differences corresponding to different mining tunnel wall-rock condition, but the characteristic of principal stress distribution is similar that compress stress centralized in sidewall and tensile stress centralized in vault and floor of the mining tunnel.

  • Abstract
  • Introduction
  • Engineering Geology Investigation
  • Numerical Simulation
  • Convergence Monitor
  • Conclusion
  • Reference

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