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Geomechanics and Engineering
  Volume 16, Number 2, October10 2018, pages 151-157
DOI: https://doi.org/10.12989/gae.2018.16.2.151
 


Influence of interaction between coal and rock on the stability of strip coal pillar
W. Gao

 
Abstract
    The constrained conditions of roof and floor for the coal pillar affect the strength of coal pillar very seriously. To analyze the influence of rock mass for the roof and floor on the stability of coal pillar comprehensively, one method based on the mechanical method for the composite rock mass was proposed. In this method, the three rock layers of roof, floor and coal pillar are taken as the bedded composite rock mass. And the influence of rock mass for the roof and floor on the elastic core of coal pillar has been analyzed. This method can obtain not only the derived stress by the cohesive constraining forces for the coal pillar, but also the derived stress for the rock mass of the roof and floor. Moreover, the effect of different mechanical parameters for the roof and floor on the stability of coal pillar have been analyzed systematically. This method can not only analyze the stability of strip coal pillar, but also analyze the stability of other mining pillars whose stress distribution is similar with that of the strip coal pillar.
 
Key Words
    influence; strip coal pillar; stress distribution; derived stress; roof and floor
 
Address
W. Gao: Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,
College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, P. R. China
 

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