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A constitutive model for structured coal based on fracture and damage mechanics

✍ Scribed by Shaoquan Kou; Dongying Ye; Yansheng Ding

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
671 KB
Volume
35
Category
Article
ISSN
0013-7944

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✦ Synopsis

Considering the microcracks as the main factor influencing the mechanical properties of the structural coal this paper derives a system of equations to describe the mechanical behavior of structured coal under loading. In this connection, the structured coal exhibits three distinctive strengths, i.e. yield strength, limit strength and residual strength, and they split the whole deformation and failure process of the coal into four stages. A mechanical model for describing the strengths and the various failure stages is suggested. Triaxial tests are carried out in order to verify the model. Specimens are prepared with coal powder taken from one of the gas and coal outburst field in China. The test results are in reasonably good agreement with the theoretical ones.

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