Influence of Different Roof Cutting Parameters on Surrounding Rock Deformation of Gob-Side Entry
In order to solve the problems of serious deformation of roadway surrounding rock and difficult support in the process of gob-side entry driving,taking 230708 working face of Huopu Mine as the engineering background,the influence of different roof cutting parameters on the stability of roadway surrounding rock under gob-side entry driving was studied by means of numerical simulation,theoretical derivation and field measurement.The results show that the shoulder angle area of coal pillar in arch roadway presents triangular slip deformation.The optimal roof cutting angle is 0°,and the optimal roof cutting height is 10 m.After pre-splitting roof cutting under this parameter,the roadway stress and surrounding rock displacement are greatly reduced compared with those without roof cutting.The peak value of vertical stress on coal pillar is reduced by 11.60％,the deformation of roof and floor is reduced by 11.29％,the displacement of two sides is reduced by 11.33％,the deformation of left shoulder socket is reduced by 8.78％,and the deformation of right shoulder socket is reduced by 15.70％.Reasonable roof cutting parameters can effectively improve the stress environment of coal pillars,reduce the deformation of roadway surrounding rock,and improve the stability of surrounding rock of gob-side entry.The field engineering practice shows that the roof cutting and pressure relief technology can effectively control the deformation of roadway surrounding rock and realize the stability control of roadway surrounding rock.
万方数据
维普
