Analysis of different geological model of anchoring effect of self drilling rock bolt
1 Hard rock
Surrounding rock strength than the big, tunnel surrounding rock without plasticization, don't need internal pressure effect.At the same time, the strength of the hard rock of the rock itself is good, the stability of the tunnel is usually controlled by discontinuity on the fracture mechanics, therefore, to maintain and control the rock anchor block, make the surrounding rock, mainly inhibitory and the relative displacement of the fracture surface parallel or orthogonal direction so as to facilitate the formation of balance arch.
2 Soft rock
In the surrounding rock strength than the soft rock tunnel surrounding rock in plasticizing, need to pressure balance effect and formed within the arch effect is given priority to, mainly control the radial displacement of tunnel wall and internal relative displacement of surrounding rock.Surrounding rock using elastic-plastic body completely assume parsing, because of the existence of internal pressure and reduce the plastic area and the surface displacement.But if you want to make the plastic zone does not occur, then at the beginning of the excavation takes a lot of supporting capacity.So we must with other means of support, such as shotcrete.
3 Sand soil surrounding rock
In small depth of sand soil surrounding rock, shotcrete is effective, according to the measurement results of the past, vault near the anchor is almost not affected by strain and stress of only.On this occasion, therefore, the use of bolt, main is to prevent the collapse of the constraints and enhance the arch foot near to give priority to.
And here introduce some applications of Sinorock self drilling rock bolt

Slope stabilization
Rock bolt is used to stabilize unstable rock formations. Compared to the traditional methods, the rock bolt is a fast and simpler method of installation. The unconsolidated or weathered ground conditions favor the rock bolt technique.
Foundations with micropiles
Micropiles can be also regarded as drilled piles, composed of injected grout with the rock bolt as steel reinforcement. rock bolt can be installed in sites with limited space. With a light drilling equipment, rock bolt can be installed into most ground conditions including rock. rock bolts are also suitable for tension and compression loads. The big advantage of rock bolt is the combination of drilling and grouting gprocess which makes high piling outputs possible.
Tunneling
rock bolt is the most economical solution for the reinforcement of the tunnel circumference. It is also suitable for advanced roof support

for tunnel excavation in overburdened and soft fractured rock conditions.