Coal rock microscopic damage evolution model and permeability increase mechanism research under ultrasound

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  • 1.School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China;
    2.Department of Engineering Mechanics, Southeast University, Nanjing 210069, China;
    3.Beijing Muntcipal Engineering Research Insatute, Beijing 100190, China

Received date: 2015-03-11

  Revised date: 2015-07-14

  Online published: 2016-01-10

Abstract

Permeability refers to that under certain pressure difference,material allows fluid through porous media.It is an important physical parameter to describe porous media permeability.Based on the continuum mechanics and phenomenological theory,the theoretical model of effective stress and damage caused by mechanical and thermal ultrasonic irradiating effects was established,considering the significant influence of secondary damage of ultrasound on granular coal and rock permeability in meso-scale.The permeability of granular coal rock under different gas pressure experiment was carried out,the empirical formula between permeability and gas pressure was fitted,and the relational model of gas permeability,effective stress and secondary damage was established.The results show that the ultrasonic effect can effectively improve the permeability of coal and rock particles system,the gradual increase of effective stress is the main reason for the permeability-increase by ultrasound;the increase of contact particle damage and the significant heating effect is the main influence factor of permeability rate decline.Research work on coal-bed methane permeability-increasing mechanism and optimization of the mining has important scientific significance and practical value in engineering.

Cite this article

Xiao Xiao-chun,Ding Xin,Xu Jun,Pan Yi-shan,Wu Di,Lü Xiang-feng . Coal rock microscopic damage evolution model and permeability increase mechanism research under ultrasound[J]. Natural Gas Geoscience, 2016 , 27(1) : 166 -172 . DOI: 10.11764/j.issn.1672-1926.2016.01.0166

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