The size and stability of section coal pillars not only affect the recovery rate of coal resources,but also affect the distribution of abutment pressure of overburden on the working face and the stability of roadway surrounding rock.In order to solve the problem of insufficient basis for the setting width of section coal pillar in Shanyang Coal Mine,the research methods of field investigation,theoretical analysis,experimental simulation,numerical simulation and field monitoring were adopted to analyze the reasonable setting width and stability of section coal pillars in 1531 working face.The results show that the reasonable setting width of coal pillar is greater than or equal to 14.21 m by theoretical calculation.When the width of section coal pillar in 1531 working face is reduced from 20 m to 15 m,the coal pillar is safe and stable.When the section coal pillar is reduced to 15 m,cracks appear on both sides of the coal pillar.When the width of the section coal pillar decreases to 14 m,the stress of the coal pillar increases to 23.81 MPa,cracks appear in the overburden above the coal pillar,and there is a possibility of instability of the coal pillar.Therefore,the reasonable setting width of the section coal pillar determined by the experiment is 15 m.Under the conditions of different coal pillar widths of 13,15,17,and 20 m,the plastic zone,vertical stress,and vertical displacement results of the coal pillar indicate that the width of the section coal pillar can be optimized to 15 m.
关键词
区段煤柱/煤柱宽度/煤柱稳定性/数值模拟
Key words
Section coal pillar/Width of coal pillar/Stability of coal pillar/Numerical simulation
维普
万方数据