Effects of Loading Rate on Strength and Failure of Coal Rock from Hancheng

Bin Zhao; Zhi Yin Wang; Yun Long Cui

doi:10.4028/www.scientific.net/KEM.577-578.589

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 577-578Effects of Loading Rate on Strength and Failure of...

Effects of Loading Rate on Strength and Failure of Coal Rock from Hancheng

Abstract:

The effects of loading rate on splitting test, uniaxial compression strength, strength parameters in triaixal compression test, and creep failure of Hangcheng coal rock were investigated through indoor mechanical experiments. Experimental results shown that tensile strength, uniaxial strength and Youngs modulus of coal rock increased with the increase of loading rate and the increment is very small. Triaixal compression strength and loading rate has a linear relation. Brittleness was very marked under high loading rate. Ductility of coal rock in the steady creep stage diminished with the increase of loading rate, and failure mode of coal rock had a change from low ductility failure mode to ductile-to-brittle failure mode. The results of experimental researches can be used to determine the bottom hole flowing pressure of coalbed methane well.

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Periodical:

Key Engineering Materials (Volumes 577-578)

Pages:

589-592

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.577-578.589

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Online since:

September 2013

Authors:

Bin Zhao, Zhi Yin Wang, Yun Long Cui

Keywords:

Coal Rock, Failure, Loading Rate, Mechanical Property

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