[General Code] GB 55017-2021 General Code for Engineering Investigation

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With the rapid development of economic construction, the construction of China's transportation infrastructure has entered a period of rapid development. Tunnels can improve transportation capacity and operating conditions, and have become an important part of transportation infrastructure. Tunnels are often built in key areas with complex terrain, which are important nodes for traffic penetration, and also difficult points for safety risk prevention. In the long-term service process, the tunnel structure will suffer from various environmental factors. Tunnel engineering has high construction cost, long service life, many structural safety factors and cannot be demolished and rebuilt. Therefore, real-time monitoring and assessment of tunnel health is extremely important.