Simulation study on optimization of coal pillar width in full coal development main roadway
The numerical simulation method was used to optimize the width of coal pillars in the coal seam development main roadway.The stability of the roadway(stress,deformation,and plastic zone)under variable mining dynamic stress and variable coal pillar width was analyzed.The results showed that when the coal pillar width was less than 30 m and the mining stress coefficient≥3.0,the verti-cal stress in the development main roadway was much higher than that when the coal pillar width was 40 m.Under the same mining stress coefficient,the displacement of the main roadway roof and two sides gradually decreases with the increase of coal pillar width,and the larger the mining stress coefficient,the greater the reduction.When the mining stress coefficient≤2.5,there is little change in the displacement of the roof and two sides of the main roadway under the width of each coal pillar.When the mining stress coefficient is greater than 2.5,the displacement of the roof and two sides of the main roadway changes less after the width of the coal pillar is 40 m,that is,the mutual influence between the main roadway and the coal pillar is relatively small when the width of the coal pillar is 40 m.When the mining stress coefficient is ≤1.5,the plastic zone of the surrounding rock mass is within the range of anchor rod and cable supporting.When the mining stress coefficient≥2.5,the plastic zone exceeds the anchor rod and cable supporting area(the deforma-tion ≥120 mm,and the distribution pattern of the plastic zone is in the shape of a"butterfly").
full coal development main roadwaymining stressoptimization of coal pillar widthnumerical simulation
NETL
NSTL
万方数据
