Stability analysis and control technology of the inclined section coal pillar under the influence of asymmetric load
To solve the complex issue of deteriorating stability of the inclined section coal pillar under the impact of working face mining and roadway excavation,the study utilized the semi-inverse method of elasticity mechanics and the Mohr-Coulomb criterion to establish the mechanical model.Combined with three-dimensional finite element numerical simulation,the study deeply analyzed the loading struc-tural morphology on one side of the inclined section coal pillar,and made clear the source and distribu-tion characteristics of the disaster-causing forces.The dynamic evolution process of plastic deformation-instability-destruction of the inclined section coal pillar under mining and excavation disturbances was explored.This revealed the critical instability disaster mechanism of the inclined section coal pillar un-der asymmetric load,thereby optimizing the stability control technology for the coal pillar and the sur-rounding roadway.The result shows that:the inclined form of the section coal pillar,caused by the in-clination angle of the coal seam,is a key factor under the influence of asymmetry load.This characteris-tic makes the bottom zone of inclined coal pillar bear the maximum load.When the zone becomes un-stable or destroyed,it expands from the plastic zone at the lower bottom of the coal pillar to the plastic zone at the upper bottom.Consequently,the regular of evolution is concluded that the critical size of the inclined section coal pillar increases with the increase in the inclination angle of the coal seam.There-fore,aiming at the problem of deformation and instability in the bottom of coal pillar and the surround-ing roadway in Dananhu No.1 Mine,some measures such as optimization of the roadway support and grouting reinforcement can reduce the deformation rate of the roadway beside the inclined section coal pillar,providing a reference for the stability control of coal pillars in similar mines.
inclined section coal pillarasymmetric loadcritical sizenumerical simulationoptimiza-tion of roadway support
万方数据
维普
