Tunnel monitoring

1.Tunnel monitoring monitoring background

Tunnel monitoring provides real-time information on ground movements and tunnel distortion (e.g. displacement, ovality, convergence) and monitors its environmental factors.In recent years, with the rapid development of my country's economic construction and cities, and the rapid development of infrastructure construction such as highways, high-speed rail, and subway, my country's tunnel construction work has entered a period of rapid development, and various tunnel accidents that have followed have also occurred frequently.The soil engineering geology and hydrogeological conditions that the tunnel passes through are complex and changeable.The existing tunnels are affected by deterioration of geological conditions, fires, structural damage, degradation and instability, natural disasters, etc., and often occur in tunnel arch cracks, side wall cracks, lining damage, tunnel water leakage, tunnel frost damage, and large deformation of surrounding rocks.It is extremely important to conduct health diagnosis and disease and disaster prevention and control of 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 the safety of the tunnel in all aspects.Our online tunnel monitoring system provides targeted monitoring solutions to the key and difficult monitoring issues in the entire life cycle of the tunnel to protect the safety of tunnel construction and operation.

3.Main monitoring contents of Tunnel monitoring

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

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

3.Groundwater monitoring: water pressure;

4.Environmental monitoring: temperature and humidity, smoke;

5.Monitoring of existing diseases: cracks;

6.Source of risk:

① Construction monitoring: uneven settlement, inclination, cracks;

② Surface monitoring: uneven settlement;

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

4.List of Tunnel monitoring monitoring items

5.Tunnel monitoring basis

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

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

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

"Technical Regulations on Monitoring and Measurement of Railway Tunnels Q/CR9218-2015"

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

"Technical Specifications for Highway Tunnel Construction JTGF60-2009"

"Technical Regulations on Monitoring and Measurement of Railway Tunnels TB10121-2007"

6.Tunnel monitoring implementation function

1.Full life cycle monitoring: By laying corresponding sensor equipment in the tunnel or outside the second lining during the construction period, the tunnel deformation and stress are automatically monitored to realize the full life cycle monitoring of the tunnel.GIS+BIM is used for comprehensive display of visual models, master the entire life cycle state of the tunnel, and provide a decision-making basis for management;

2.Automatic report push: In addition to real-time display of monitoring results, the system will automatically generate corresponding daily reports, and one-click download is supported.Once the data exceeds the threshold, timely warnings and notify relevant units to take corresponding measures in a timely manner;

3.Leveled early warning: Set different early warning levels according to requirements.When the data is abnormal, the early warning information will be automatically triggered according to the settings, including platform push, text messages and email notification to the corresponding person;

4.Accumulate tunnel status data: provide necessary decision-making basis for long-term operation and maintenance, maintenance and reinforcement of tunnels, and provide basis for the assessment of the safety status of the tunnel after emergencies.At the same time, AI algorithm is used to predict the structural response and development of the bridge in the future time period;

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