Mechanical Characteristics of Soft Coal,Hard Coal,Mudstone Gangue and Their Significance in Gas Geology
ZHAO Zhi-gen
LI Chang-shun
YING Cheng-juan
Abstract：Coal and gas delay outburst is a special type of coal and gas outburst ,it tends to suddenly happen ,and it is often unexpected. The research on mechanical properties of different types of coal and rock in coal body structure will be helpful to understand the process or mechanism of coal and gas de‐lay outburst.Mechanical properties test results of coals and gangues from Wangfenggang Coal show that :①The strengths of three rock samples are quite different ,it is small for soft coal ,big for mud‐stone gangue ,and middle for hard coal ,the stress-strain curves of them are obvious different as well ;② The hard coal and mudstone gangue can keep a period of time in a stable creep stage after rapidly finishing the attenuation creep stage ;③ The creep characteristic of soft coal is completely different from hard coal and mudstone gangue ,it’s decay rate is fast in the beginning ,and then slow ,however it is always in the stage of attenuation creep.
Keywords：soft coalhard coalmudstone ganguemechanical characteristiccoal and gas delayed out-burst
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 1-4 )