Damage mechanics around a tunnel due to incremental ground pressure

Rock mass failure has been investigated by actual measurements around a horizontal rock drift during adjacent panel extraction in a coal mine at 820m depth. New failure behavior of the strata surrounding the opening was found. There were three new features: sinusoidal strain distribution in which a...

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Bibliographic Details
Published inInternational journal of rock mechanics and mining sciences (Oxford, England : 1997) Vol. 34; no. 3-4; pp. 222.e1 - 222.e14
Main Authors Nazimko, V.V., Peng, S.S., Lapteev, A.A., Alexandrov, S.N., Sazhnev, V.P.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.04.1997
Subjects
analytical method
boreholes
extensometers
failure
fractures
mining
strain
Tunnel
strain
boreholes
Tunnel
analytical method
failure
extensometers
mining
fractures
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Summary:Rock mass failure has been investigated by actual measurements around a horizontal rock drift during adjacent panel extraction in a coal mine at 820m depth. New failure behavior of the strata surrounding the opening was found. There were three new features: sinusoidal strain distribution in which a tensile wave followed by a compressed zone; sudden and non-uniform expansion of the fractured zone in different directions; and relaxation of the tension compression gradient of the strain within the fractured zone. Theoretical consideration of the process based on the diffusion of the rock mass defects into the tunnel cavity has been corroborated and can be used to explain the sinusoidal nature of the damage mechanics. The compression zones enhance the stability of the roadway. A strategy of zone control has been proposed to maintain the stability of openings in varying stress environment.
ISSN:1365-1609
1873-4545
DOI:10.1016/S1365-1609(97)00245-1