The Main Factors About The Stability Of Mining Rock Bolts

The use of mining rock bolts has eliminated hidden dangers to production and reduced the labor intensity of ordinary manpower in a certain extent. The synchronous water injection design of the rock bolt effectively prevents sparks generated by the frictional collision between the core drill and the rock bolt during the recovery process, it avoids the possibility of sparks produced by the friction between the shearer cutting head and the mining rock bolts during coal cutting, and removes the induced coal dust dangerous possibility of accident.

1. What are the main factors affecting the stability of the mining rock bolts?

The hardness of the surrounding rock of the roadway determines the support function. If the surrounding rock is soft, it will deform and make the maintenance of the roadway difficult. If the hardness of the surrounding rock is very strong, the natural surrounding rock has a strong load capacity and the roadway ’s high stability, such a roadway is easy to maintain. The hardness of the surrounding rock of the roadway actually determines the load capacity of the surrounding rock. The load capacity is strong and the hardness is sufficient, so the maintenance effect is better.

2. Ground stress
Ground stress includes dead weight stress, geotectonic stress, and mining concentrated stress. Dead weight stress refers to the stress caused by the weight of the rock and soil itself. The strength of this stress is determined by the weight of the rock and the burial depth. If the distance between the roadway and the ground is large, the surrounding rock will be more easily deformed and the stability of the relative surrounding rock will be reduced. Therefore, the burial depth of the roadway has a great impact on the stability of the surrounding rock.

3. Roadway section shape and roadway section size
Because the stress distribution of the section will change with the change of the shape, if you want to improve the stress distribution of the surrounding rock, you can change the shape of the section to achieve the effect. For example, the circular and elliptical sections have a more uniform stress distribution. The comparison of rectangles is worse. In addition, besides being affected by the shape, it also changes due to the width and height of the roadway, so all the above factors must be fully considered.

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