What are the functions of tunnel support? The functions of tunnel support are mainly reflected in the following aspects:

　　1. Stabilize surrounding rock: After tunnel excavation, the original geological stress balance is broken, and the surrounding rock may loosen, crack or even collapse. Tunnel support helps the surrounding rock maintain a new stress balance by providing external support force, prevents or slows down the deformation and damage of the surrounding rock, and ensures the stability of the tunnel.

　　2. Control deformation: Tunnel excavation will cause displacement and deformation of the surrounding strata. Excessive deformation may cause damage to the tunnel structure or affect its normal use. The support structure can limit the development of these deformations, maintain the geometry and size of the tunnel section, and meet the design and use requirements.

　　3. Waterproof and anti-seepage: Tunnel support not only plays a structural support role, but also often has a waterproof function. Especially in areas with complex hydrogeological conditions, the support structure can effectively prevent the infiltration and erosion of groundwater and protect the tunnel structure from the influence of moisture.

　　4. Provide a safe construction environment: During the tunnel construction process, timely and effective support can provide a safe working space for construction personnel and reduce the risk of safety accidents caused by the instability of the surrounding rock.

　　5. Extend the service life of the tunnel: Good support design can enhance the overall strength and durability of the tunnel, resist the erosion and damage of the external environment, and thus extend the service life of the tunnel.

　　6. Optimize the construction plan: According to different geological conditions and tunnel types, choosing the appropriate support method can optimize the construction plan, improve construction efficiency, and reduce engineering costs.

　　7. Adapt to complex geological conditions: When encountering complex geological conditions such as faults, weak interlayers, and high ground stress areas, appropriate support measures can help the tunnel pass through these areas smoothly and ensure the smooth progress of the project.

　　8. Work together with the surrounding rock: Make the surrounding rock and support structure form an overall bearing system to give full play to the bearing capacity of the surrounding rock itself.

　　In short, tunnel support is an important means to ensure the safe, stable and efficient construction of tunnel projects, and it plays an irreplaceable role in improving the quality and benefits of tunnel projects.