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Stability Analysis of Underground Excavations in Limestone Under Dynamic Loading

Public Domain


Details

  • Personal Author:
  • Description:
    Fault-slip bursts induced by mining activities can result in severe damage to nearby mine development. In general, engineers designing rock support in burst-prone mines not only need to consider stress redistribution resulting from excavation, but also dynamic loading that results from seismic waves generated by large mining-induced fault-slip events. In this study, we simulated dynamic waves in sedimentary rock from a blasting source and from a mining-induced-seismicity source using a Universal Distinct Element Code (UDEC) model with Discrete Fracture Networks (DFNs). Our purpose was to investigate the stability of openings and the adequacy of existing support systems at an underground limestone mine in South Korea. A baseline model with only static loading was also simulated, which verified observed stability under such conditions. The results indicate that the current support system of shotcrete lining is likely to work well under dynamic loading caused by blasting. However, when the dynamic source was a far-field fault-slip event, the dynamic loading exceeded the support capacity of the shotcrete lining. Thus, if a mine is operating in ground with an elevated risk of mining-induced fault slip, mine engineers should consider seismic wave propagation and ground motion distribution from a remote, mining-induced fault-slip event to determine a suitable support design. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • Series:
    Mining Publications
  • Publisher:
    Society for Mining, Metallurgy & Exploration (SME)
  • Document Type:
    Text
  • Genre:
    Proceedings
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    SMRD - Spokane Mining Research Division
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    1-11
  • NIOSHTIC Number:
    nn:20068648
  • Citation:
    Proceedings of the 42nd International Conference on Ground Control in Mining (ICGCM 2023), July 25-27, 2023, Canonsburg, Pennsylvania. Klemetti T, Tulu IB, Lawson H, Murphy M, Perry K, eds. Englewood, CO: Society for Mining, Metallurgy & Exploration (SME), 2023 Jul; :1-11
  • Editor(s):
    Klemetti T; Tulu IB; Lawson H; Murphy M; Perry K
  • Federal Fiscal Year:
    2023
  • NORA Priority Area:
    Mining
  • Peer Reviewed:
    False
  • Source Full Name:
    Proceedings of the 42nd International Conference on Ground Control in Mining (ICGCM 2023), July 25-27, 2023, Canonsburg, Pennsylvania
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:4dcb928117929afd121ff21783e4199f58515187139f09a3c50ed34ee6444872b404cff2db376f9d030196427ff7c771efe25f5aa44a1b4026e4c15707209714
  • Download URL:
  • File Type:
    Filetype[PDF - 5.10 MB ]
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