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At present, the application of BIM and IoT in construction is more and more common. However, few studies combine BIM with IoT for real-time monitoring of mountain tunnels. This paper have designed a tunnel automatic monitoring system based on BIM and IoT. Various sensing devices are arranged inside the tunnel to collect deformation, groundwater level and other monitoring data. Satellite monitoring data is collected through GNSS outside the tunnel. The above information is dynamically transmitted to the cloud computing platform by using the NTRIP and ZigBee wireless communication technology. At the same time, the data in the construction drawings are imported into the 3D model by BIM technology to informationize the tunnel model and visualize the monitoring data. This can effectively reduce the accident rate and improve the efficiency of tunnel construction management. At the same time, it provided a new idea for the joint application of BIM, IoT and GNSS in tunnel automatic monitoring system.

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