Huge structures are very costly to monitor with cabled installations: wireless sensors are the optimal solution.
During the construction and the life of the tunnels it is important to understand the soil type and the deformation state.
Control terrain deformation, tensions, stresses, and subsidence.
It’s necessary to analyze the degradation of the structure and of the ground over time.
KEY PARAMETERS FOR TUNNEL MONITORING
Using a series of Tiltmeters or Tilt-beams, positioned in series on a section of the tunnel, it is possible to obtain convergence measurements of the coating and to establish if and how it is deforming.
With the use of the Analog and Digital communication nodes, it was possible to expand this monitoring system to other non-native wireless instruments of geotechnical type, such as load cells, crackmeters, vibrating wire and more.
You can evaluate both the pressures exerted by the ground, the load distribution on the foundations and its deformation.
You can monitor the ground displacement (settlement or lateral movement) and groundwater levels.
You can measure the Pitch angle and the Roll angle with high precision. These measurements allow obtaining fundamental parameters for the static monitoring of the tracks.
Control of all external atmospheric agents such as wind direction and speed, rain, humidity and temperature.
Tunnel IoT remote monitoring
The insertion of a system of Tiltmeters in the same section allows to obtain angular variations and a measure of the convergence/divergence of the tunnel. The system thus studied can be applied during work to monitor short/long-term stability and easily implemented as work progresses.
With the insertion of load and pressure cells, between the rib and the ground, it is possible to monitor and control the pressure that the soil exerts on the lining of the rib and the load that the latter exerts on the lower arch.
The use of strain-gauges located along a section allows to monitor the tensional state of the tunnel lining and to correlate this local deformation with the total deformation of the arch. In case there is an important cracking framework, the use of crack-meters allows you to keep under control.
Monitoring a tunnel is essential for the short and long-term control of the stability of the tunnel itself, as well as the surrounding terrain and adjacent buildings. The insertion of geotechnical sensors in the ground such as piezometers and inclinometric probes allow to monitor the tenso-deformation state of the soil and evaluate its evolution over time to avoid timely dangerous events.