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Discrete Element Modeling of Delamination in Laboratory Scale Laminated Rock

Public Domain


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  • Personal Author:
  • Description:
    Laminated rock can delaminate and fail under certain stress states. Delamination-caused roof fall and cutter roof failure is a common failure mechanism in roadways in Pittsburgh coal seam due to the existence of laminated shale roof. Two-dimensional numerical models were developed at laboratory scale based on the bonded particle method in order to simulate the delamination with particle flow code. In these models, an assembly of bonded particles and parallel weak planes represents the laminated rock. This model calibrated the micro-parameters of the bonded particle material and weak planes with laboratory data. The mechanism of fracturing and delamination in a laminated specimen was investigated using unconfined and confined compression test and unsupported roof compression test. The numerical results show that, under a constant horizontal stress, delamination occurs when the stress is much lower than its compressive strength. The confined compressive test indicates that delamination is restrained by applying confining stress since delamination-caused failure does not occur during any stage of the confined compressive test. Unsupported roof compression tests showed propagation of cutter roof failure with initiation of cracks and delamination at the intersections of the roof and ribs. An outer failed zone and inner failed zone form separately. The separated zones connect and form an opening in the roof. The presented numerical results provide additional insight into process of delamination. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISSN:
    2524-3462
  • Document Type:
    Text
  • Genre:
    Journal Article
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    433-446
  • Volume:
    38
  • Issue:
    1
  • NIOSHTIC Number:
    nn:20061106
  • Citation:
    Min Metall Explor 2021 Feb; 38(1):433-446
  • Contact Point Address:
    Qingwen Shi, Department of Mining Engineering, West Virginia University, Morgantown, WV 26505
  • Email:
    wvuqingwenshi@gmail.com
  • Federal Fiscal Year:
    2021
  • Peer Reviewed:
    True
  • Source Full Name:
    Mining, Metallurgy & Exploration
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:a6fabdd41cfad5ba85609044e1f320a85f464fc2b093da802faa23bbcda8fe120b0ebb721e4022fa60d21681c684bd3ae461c1424de864a5f8a672f73fa1d502
  • Download URL:
  • File Type:
    Filetype[PDF - 7.19 MB ]
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