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04
2025
-
07
What are the requirements for subway tunnel construction
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The construction requirements for subway tunnels mainly include geological survey, construction methods, support measures, drainage and waterproofing, ventilation control, monitoring and measurement, safety management, etc. The specific requirements are as follows:
Geological exploration and advanced forecasting
It is necessary to use geophysical exploration, drilling and other methods to grasp the rock structure and groundwater situation, in order to prevent collapse or water inrush accidents.
Construction method selection
Select drilling and blasting methods (traditional flexible), shield tunneling/TBM (efficient) and other methods based on geological conditions to ensure excavation stability.
Support measures
Timely carry out initial support (anchor rods, shotcrete, etc.) to control the deformation of surrounding rock, and reinforce the structural strength with secondary lining.
Drainage and Waterproofing
Install blind pipes and waterproof layers to prevent leakage, structural damage, or operational hazards.
Ventilation control
Forced ventilation is required for tunnel operations to ensure air circulation and prevent the accumulation of harmful gases.
Monitoring and measurement
Dynamically adjust construction parameters through settlement and convergence monitoring data to achieve information-based construction.
Security management
Develop emergency plans (for landslides, fires, etc.), standardize work processes, control safety steps (distance between the arch and the face of the tunnel ≤ 40 meters, distance between the secondary lining and the face of the tunnel ≤ 70 meters), and ensure construction safety and efficiency.
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