What should be done when encountering faults during tunnel construction? The treatment method for faults encountered during tunnel construction usually depends on the scale, nature, and construction conditions of the faults. Here are some common handling methods:

　　Pre detection and evaluation: Before construction, detailed detection and evaluation of faults are carried out through advanced technologies such as geological exploration and geological radar. This helps to understand the scale, direction, and relationship with surrounding rocks of faults, in order to develop appropriate construction plans.

　　1. Strengthen support: When encountering faults, measures to strengthen support should be taken, such as adding temporary support structures (such as steel supports, wooden supports, etc.) to prevent collapse and sliding. Meanwhile, depending on the scale and nature of the fault, more robust support materials and techniques may be required.

　　2. Control footage: Reduce the footage of a single excavation to minimize impact and damage to faults. By gradually approaching, gradually crossing the fault area.

　　3. Grouting reinforcement: Before crossing the fault, grouting technology can be used to reinforce the fault. By injecting materials such as cement slurry and chemical slurry into fault fissures to fill the gaps, the overall strength and stability of the rock can be improved.

　　4. Adjusting the construction plan: Depending on the specific situation of the fault, it may be necessary to adjust the original construction plan. For example, changing the excavation method (such as using step method instead of full section method), or adjusting the construction sequence.

　　5. Monitoring and early warning: During the construction process, strengthen monitoring of tunnel deformation, support structure stability, etc. By monitoring data in real-time, potential risks can be identified in a timely manner and corresponding response measures can be taken.

　　6. Emergency evacuation and rescue: Once a serious geological disaster occurs, such as collapse or flooding, the emergency plan should be immediately activated, personnel should be organized to evacuate to a safe area, and necessary rescue measures should be taken.

　　The above methods are not used in isolation, but are comprehensively considered based on actual situations and a combination of multiple measures are taken to address the fault problems encountered during tunnel construction. In practical operation, relevant safety regulations and technical standards should be strictly followed to ensure the safety and smooth progress of construction.