# Numerical Simulation Analysis Method for Rockburst Control in Deeply Buried Caverns
## 5 Analysis of the Rockburst Control Effect in Deep Tunnel Excavation
Compared with the situation without the anchor rod support (see Figure 3(a)), the medium rockburst was fully controlled on the tunnel face, with only a local light rockburst on the face. The entire rockburst volume decreased by 80.0%. In the bottom corner range of the tunnel without anchor rod support, the strong and extremely strong rockburst volume remained unchanged, with a volume of 1.3 m\({}^{3}\) accounting for 6.34% of the entire rockburst volume. According to the strength theory, the volumes of light, medium, strong, and extremely strong rockburst are 0.8 m\({}^{3}\), 0.1 m\({}^{3}\), 0.7 m\({}^{3}\), and 0.5 m\({}^{3}\), respectively (see Figure 6(b)). Compared with the situation without the anchor rod support (see Figure 3(b)), only a 0.4 m\({}^{3}\) rock mass element on the tunnel face experienced a light rockburst while the rockburst in other parts was basically controlled. The entire rockburst volume decreased by 89.0%. In the entire corner range of the bottom of the tunnel without anchor rod support, the strong and extremely strong rockburst volume remained unchanged, with 1.3 m\({}^{3}\) still accounting for 6.87% of the entire rockburst volume. From this, we can see that the effect of using anchor rod support to control the rockburst is relatively obvious. Whether analyzed based on energy theory or strength theory, the control of the rockburst is obvious. From this, we can see that the effect of using anchor rod support to control the rockburst is relatively obvious. Whether analyzed based on energy theory or strength theory, the control of the rockburst is obvious. Comparing the results of the two measures, we can see that using the borehole element is a measure that actively releases part of the energy in the rock mass through the local cavity effect, which is limited and works only for some light rockburst control. The anchor rod is a method that can reinforce the rock mass, improve the overall stiffness, limit the deformation of the surrounding rock, and provide support reaction force for the surrounding rock during stress adjustment. Therefore, the stress on the anchor rod is generally high in the area where the rockburst occurs. From the distribution of the anchor rod stress around the tunnel in Figure 8, we can see that the anchor rod stress is relatively high at the tunnel face where the rockburst occurs relatively strongly and at the corner of the tunnel where the stress is concentrated. On the tunnel face with relatively high energy release, some anchor rods have reached a yield stress of 400 MPa and the surrounding anchor rods are also close to yielding. The anchor rod stresses near the corner of the bottom of the tunnel are relatively high, reaching 370-398 MPa, which is also close to yielding. The above results indicate that borehole elements can relatively well reflect the characteristics of local stress release and alleviate rockburst and anchor rod elements can be used to effectively simulate the  
Figure 7: Distribution of rockburst after anchor rod support. containment principle of the overall resistance to the rockburst of the surrounding rock reinforced by anchor rods.