Study on floor heave mechanism and control technology of gob-side entry retaining of No.12 coal in Ulan Mulun Coal Mine
When the mining geological conditions are suitable for the implementation of gob-side entry retaining,the coal pillar in the working face section can be cancelled,which on the one hand can greatly improve the recovery rate of coal resources,and on the other hand can better arrange mining replacement activities if the excavation team is tight.Therefore the flexible form concrete gob-side entry retaining technology was implemented in No.12 coal mine of Ulan Mulun Coal Mine.In order to control the deformation of the floor heave during the implementation process,deep analysis of floor heave deformation of gob-side entry retaining was carried out from the mechanism level based on the investigation of floor heave failure phenomenon of gob-side entry retaining at No.12407 working face.Based on the ultimate equilibrium theory and slip field theory,the mechanical modeling was carried out to calculate the vertical pressure value and maximum floor heave pressure position of gob-side entry retaining floor under the influence of mining support stress.There-fore,corresponding control measures such as mountain facing angle of flexo-mode concrete wall,optimization of temporary strengthening support and measures of laying wooden point column were put forward.After adopting those method,the roadway floor has good rough-ness,which can meet the needs of roadway reuse well.
flexible form concretegob-side entry retainingsurrounding rock controlfloor heave deformation
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