Numerical simulation on enhancing the stability of coal pillars on the goaf side by applying slurry casing pipes
To solve the problem of deformation of narrow coal pillars on the goaf side under mining action,slurry filling casing pipes were used on site to reinforce the floor rock masses and improve the coal pillar stability.The numerical simulation was used to analyze the control on floor rock deformation by slurry cosing pipes.The calculation results show that to the section direction,the measuring points on both sides of the coal pillar have high deformations and in the middle part show low distortion.To the gob direction,the deformation is higher than that near roadway sides.Inconsistent deformation will lead to uneven stress on the coal pillars and the deformation morphology of the coal pillars under roof stress becomes more complex.By means of slurry casing pipes,the deformation of the measuring points at the base of the coal pillar is reduced.The deformation of the measuring points at side coal pillars floor in roadways will reduce by 20.5%,which is higher than that on goaf side by 19.2%.As mining,the deformation on the floor strata will gradually reduce with the increase of depth,and the deformation of the floor strata is reduced by slurry filling.The result provides a significant guide for deformation of side coal pillars in roadways along goaf in similar mines.
slurry filling casing pipescoal pillar deformationfloor rock massesnumerical calculation
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