Dip Angle Effect on the Main Roof First Fracture and Instability in a Fully-Mechanized Workface of Steeply Dipping Coal Seams | Zendy

Zhen Wei | Zendy; Ke Yang | Zendy; Xiaolou Chi | Zendy; Wenjie Liu | Zendy; Xinyuan Zhao | Zendy

Open Access

Dip Angle Effect on the Main Roof First Fracture and Instability in a Fully-Mechanized Workface of Steeply Dipping Coal Seams

Author(s) -

Zhen Wei,

Ke Yang,

Xiaolou Chi,

Wenjie Liu,

Xinyuan Zhao

Publication year - 2021

Publication title -

shock and vibration

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.418

H-Index - 45

eISSN - 1875-9203

pISSN - 1070-9622

DOI - 10.1155/2021/5557107

Subject(s) - roof , coal mining , geology , coal , geotechnical engineering , instability , fracture (geology) , overburden , overburden pressure , stress (linguistics) , magnetic dip , arch , shear (geology) , mining engineering , structural engineering , engineering , mechanics , petrology , linguistics , philosophy , physics , geophysics , waste management

The fracture instability mechanism of the basic roof is the key to support selection and surrounding rock stability control, and it is also the guarantee of safe and efficient coal mining. By means of theoretical analysis and numerical calculation, the calculation model of basic roof of steeply dipping coal seams (SDCS) under linear load is established, the stress distribution expression of basic roof plate is deduced, the inclination effect of stress evolution of steeply dipping coal seams (SDCS) workface is analyzed, and the “sequential” weighting mechanism of workface is revealed. Based on the numerical simulation test, the evolution laws of vertical stress release and shear stress concentration of overlying strata in workface with different coal seam dip angles are obtained. The results show that there is shear stress arch in the overlying strata. With the increase of coal seam dip angle, the overlying strata are suddenly damaged under the action of shear stress. The roof is in the state of discontinuous movement due to its self-weight and overburden pressure. Support is affected by the discontinuous movement and moved along with the roof. The results of this study can be of theoretical reference to the control of SDCS.

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