Research on support design and surrounding rocks control in deep thick coal seam mining roadway

To study the support design of deep thick coal seam roadway, we propose three support design schemes from the perspective of safety and support cost based on the 432 belt transportation roadway in Tangyang Coal Mine. Theoretical analysis, numerical simulation and engineering practice were used to study the values of the support parameters, displacement and deformation, plastic zone and the actual support effect of each scheme. The theoretical analysis results show that the anchor parameters and row spacing of the three support schemes are in line with the theoretical calculation values. Numerical simulation results show that: the relative displacement and deformation of the top and bottom plates and the two sides of support scheme I are 77.6 mm and 103.4 mm, respectively; the relative displacement and deformation of support scheme II are 79.7 mm and 105.5 mm, which are similar to those of support scheme I and have the least plastic failure elements; the maximum displacement and deformation of support scheme III are 83.8 mm and 111.1 mm, respectively. The support cost of support scheme II is only 64.7% of that of scheme I when the support effect is similar. The engineering practice results show that the actual support effect of support scheme II can realize the safety support of roadway.