Tunnel monitoring

1. Tunnel monitoring background

Tunnel monitoring provides tunnel health diagnosis and dynamic early warning through deformation monitoring, force monitoring, groundwater monitoring, and environment monitoring.In recent years, with the rapid development of my country's economic construction and cities, as well as the rapid development of infrastructure construction such as highways, high-speed rails, and subways, my country's tunnel construction has entered a period of rapid development, and various tunnel accidents have followed frequently.occur.The soil engineering geology and hydrogeology conditions that the tunnel passes through are complex and changeable.Existing tunnels are affected by deterioration of geological conditions, fires, structural damage, degradation and instability, natural disasters, etc., and tunnel vault cracks, side wall cracks, etc.often occur.Lining damage, tunnel water leakage, tunnel freezing damage, large deformation of surrounding rock and other diseases, it is extremely important to carry out health diagnosis, disease and disaster prevention and control on active operating tunnels or tunnels during construction.

2.Overview of Tunnel monitoring system

The geological conditions of the surrounding rock of the tunnel are complex and the construction environment is harsh.It is difficult for traditional manual inspection methods to ensure tunnel safety in all aspects.Our tunnel online monitoring system provides targeted monitoring solutions for key and difficult monitoring issues in the entire life cycle of tunnels, ensuring the safety of tunnel construction and operations.

3.Main monitoring contents of Tunnel monitoring

1.Deformation monitoring: vault settlement and convergence monitoring, internal displacement of surrounding rock;

2.Force monitoring: anchor axial force, primary support stress, secondary lining stress, surrounding rock and primary support contact pressure, primary support and secondary lining contact pressure, steel arch stress;

3.Groundwater monitoring: water pressure;

4.Environmental monitoring: temperature, humidity, smoke;

5.Monitoring of existing diseases: cracks;

6.Risk sources:

①Building monitoring: uneven settlement, tilt, cracks;

②Surface monitoring: uneven settlement;

③Monitoring of the slope of the tunnel entrance: surface displacement, internal displacement, rainfall, and soil moisture content.

4.List of Tunnel monitoring monitoring projects

5.Tunnel monitoring monitoring basis

"Technical Specifications for Highway Tunnel Construction JTG/T 3660-2020"

"Technical Specifications for Monitoring of Highway Tunnel Construction" (Draft for Comments)

"Technical Specification for Urban Tunnel Maintenance DB41∕T 1271-2016"

"Technical Regulations for Railway Tunnel Monitoring and Measurement Q/CR9218-2015"

"Technical Specification for Highway Tunnel Maintenance JTG H12-2015"

"Technical Specification for Highway Tunnel Construction JTGF60-2009"

"Technical Regulations for Railway Tunnel Monitoring and Measurement TB10121-2007"

6.Tunnel monitoring implementation function

1.Full life cycle monitoring: By arranging corresponding sensor equipment inside the tunnel or outside the secondary lining during the construction period, automatic online monitoring of tunnel deformation, stress, etc.can be achieved to achieve full life cycle monitoring of the tunnel.GIS+BIM is used for comprehensive display of visual models to grasp the full life cycle status of the tunnel and provide decision-making basis for management;

2.Automatic push of reports: In addition to real-time display of monitoring results, the system will automatically generate corresponding daily reports and support one-click downloading.Once the data exceeds the threshold, a timely warning can be given and relevant units can be notified to take corresponding measures in a timely manner;

3.Graded early warning: Set different early warning levels as required.When data is abnormal, early warning information will be automatically triggered according to the settings, including platform push, SMS and email notifications to the corresponding person;

4.Accumulate tunnel status data: Provide the necessary decision-making basis for the long-term operation, maintenance, repair, and reinforcement of the tunnel, and provide the basis for the safety status assessment of the tunnel after an emergency.At the same time, AI algorithms are used to predict the future time period of the bridge.Structural response and development;

5.Provide reference basis: verify the design and construction theory and construction technology of the tunnel, thereby improving the relevant design and construction technical regulations and ensuring the safety of the tunnel.