Inclined main section surface subsidence influence and prediction by negative coal pillar face mining
To study the surface subsidence law and patterns in negative coal pillar face layout,we take on-site measurement and numerical simulation to study the influence of spatiotemporal relationship of negative coal pillar working faces on the subsidence of the inclined main section.The results show that the subsidence curve of the negative coal pillar working face is smoother on the triangular coal pillar side than that on the rectangular coal pillar side,with an increase in subsidence of the overlying strata and connection of the collapse zones,resulting in a flat-bottomed subsidence area on the surface.As the mining interval increases,the surface deformation becomes more uneven,and the disturbance of the continuous working face on the overall strata decreases,deformation concentrating above the initial mining face.The maximum subsidence point shifts towards the direction of the initial mining face,and the maximum point first reduces and then becomes stable.Based on the probability integral method,we propose surface subsidence prediction method,which is validated by comparing with field measurements data,demonstrating the practicality and reliability of this method.
multiple facesnegative pillarmining intervalspace and time relationshipsurface subsidence
NETL
NSTL
万方数据
