Abstract
The surrounding rock control technology of mining roadways in large inclination seams with a weak structural plane in the roof is one of the most challenging fields in underground roadway support. In view of the serious deformation of the surrounding rock of the transportation roadway in the 1201 working face of a mine, the deformation and failure characteristics and instability mechanism of the surrounding rock of the roadway are analysed. The self-stability mechanical model of the roof block structure of the roadway with a large inclination under the support effect is established, and the support concept of “high pre-stressed asymmetric” and the combined support method of bolts, wire mesh, and cables are proposed. The rationality of the supporting scheme is verified by numerical simulation. The results show that: compared with bolt and wire mesh support, the maximum shear displacement of the roof’s weak layer under the combined support of bolt, wire meshes, and cable before and after mining is reduced by 86.78% and 83%, respectively, and the maximum total displacement of surrounding rock surface is reduced by 49.22% and 37.1%, respectively. The field monitoring results show that the combined support scheme can effectively control the deformation of the surrounding rock.
Highlights
Accepted: 13 August 2021It is generally believed that a coal seam with inclination angle between 35–55◦ can be called the coal seam with large inclination [1]
It is of great significance to study the stability control system and technology of surrounding rock of roadway in the large inclination seam with a weak structural plane in the roof to ensure the safe and efficient production of the mine
The roof on instability mechanism roadway large inclination, duringmainly roadway order to simulate the of influence of with sliding effect of the weak rock section analyses the In deformation and failure characteristics of surrounding thestructural interface between roof coal and clay stone of transportation roadway in working plane of the roof on instability mechanism of roadway with large inclination, during roadway excavation
Summary
It is generally believed that a coal seam with inclination angle between 35–55◦ can be called the coal seam with large inclination [1]. It is of great significance to study the stability control system and technology of surrounding rock of roadway in the large inclination seam with a weak structural plane in the roof to ensure the safe and efficient production of the mine. Due to the influence of the dip angle effect, the surrounding rock structure of steeply dipping coal seam roadway often shows asymmetric and unbalanced instability characteristics, so its control is difficult. The mechanism of surrounding rock instability mode of roadway in large inclination seam considering the sliding effect of roof weak structural plane is quite different from that without considering weak structural plane, so the supporting design is not the same.
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