Development of new three-dimensional coal mass strength criterion

Peng Fei He, Pinnaduwa H.S.W. Kulatilake, Dong Qiao Liu, Man Chao He

Research output: Research - peer-reviewArticle

Abstract

In this study, laboratory tests were conducted to obtain the geomechanical properties for the coal matrix and coal discontinuities. Computed tomography (CT) scanning technology was then used to detect the pre-existing fracture networks of the cubic coal blocks. Fracture tensor-based methodology was used to quantify the fracture geometry network that exists inside the cubic coal blocks. The same cubic coal blocks were subjected to the true triaxial tests to obtain the jointed coal mass strength (JCMS) values under different confining stresses. The fracture network constructed from the CT scanning was incorporated into the numerical model of jointed coal block to simulate the laboratory true triaxial tests, and to first calibrate the parameter values of the numerical model and then validate them. More numerical true triaxial tests were performed on some jointed coal blocks with selected fracture networks and five additional artificial fracture networks under different confining stress combinations to consummate the JCMS data bank. The obtained data bank was finally used to develop a new three dimensional (3D) coal mass strength criterion that can capture the scale effect and anisotropic strength behaviors.

LanguageEnglish (US)
Article number04016067
JournalInternational Journal of Geomechanics
Volume17
Issue number3
DOIs
StatePublished - Mar 1 2017

Fingerprint

coal
fracture network
triaxial test
testing
tomography
computed tomography
fracture geometry
scale effect
discontinuity
matrix
methodology
parameter
laboratory test
laboratory
geometry
laboratory experimentation

Keywords

  • Coal mass strength criterion
  • Computed tomography (CT) scanning
  • Fracture network
  • Fracture tensor
  • Numerical modeling
  • True triaxial tests

ASJC Scopus subject areas

  • Soil Science

Cite this

Development of new three-dimensional coal mass strength criterion. / He, Peng Fei; Kulatilake, Pinnaduwa H.S.W.; Liu, Dong Qiao; He, Man Chao.

In: International Journal of Geomechanics, Vol. 17, No. 3, 04016067, 01.03.2017.

Research output: Research - peer-reviewArticle

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