The Main Factors Of integrity And Stability Of Anchor Support

The main factors of integrity and stability of anchor support

The put into use of anchor rods eliminates the hidden dangers in safety production to a certain extent and reduces the labor intensity of workers. The synchronized water injection design of anchor rods effectively prevents sparks generated by the friction and collision between the core drill bit and the anchor rods during the recovery process, avoids the possibility of sparks generated by the friction between the cut-off head of the coal mining machine and the anchor rods during coal cutting, and eliminates the possibility of inducing gas and coal dust accidents.

The use of anchor rods also provides a new method for the quality acceptance of roadway support project and improves the construction quality. Whether the selected anchor is qualified, whether the angle of injection is reasonable, whether the amount of anchoring agent is sufficient, arbitrary extraction, recycling test, a look will know.

1、Hardness of tunnel surrounding rock 

The hardness of the surrounding rock of the roadway determines the play of the support role, if the surrounding rock is soft, there will be deformation of the situation, which will make the maintenance of the roadway is more difficult; if the surrounding rock hardness is very strong, naturally, the surrounding rock loading capacity will be strong, the stability of the roadway will be relatively high, the roadway will be good to maintain. The hardness of the peripheral rock actually determines the loading capacity of the peripheral rock, and if the loading capacity is strong, the hardness will be enough, so the maintenance effect will be better.

2、Ground stress

Ground stress includes self-gravity stress, geological tectonic stress and mining concentrated stress. Self-gravity stress refers to the stress caused by the weight of the rock and soil itself, and the strength of this stress is determined by the weight of the rock and the buried depth. If the distance between the roadway and the surface is larger, the surrounding rock will be deformed more easily, and the relative stability of the surrounding rock will be reduced, so the buried depth of the roadway has an influence on the stability of the surrounding rock. Geological tectonic stress refers to the stress required by the geology to form a certain tectonic system, if the tectonic stress is large, the faster the geological tectonic development, and thus the lower the degree of peripheral rock development, and thus the worse the stability of the tunnel peripheral rock. Concentrated mining stress refers to the stress of coal mining, when the roadway and coal mining lots are very close, the mining stress will be very large, this mining stress is directly related to the coal seam roadway, coal mining thickness.

3、Shape of roadway section and size of roadway section

Because the stress distribution of the section will change with the change of shape, so to improve the distribution of stress in the surrounding rock, you can change the shape of the section to achieve the effect, such as round, oval section, the stress distribution is more uniform, trapezoidal, rectangular will be poorer in comparison.