What is tunneling? Mention the hazards and risks involved in tunneling work.

Tunneling is a construction process that involves creating an underground passage, typically through soil, rock, or other substrates. Tunnels serve various purposes, including transportation (e.g., road and railway tunnels), water conveyance (e.g., water supply and sewage tunnels), and utility installation (e.g., for pipelines and cables). Tunneling projects can vary greatly in scale and complexity, ranging from small utility tunnels to large infrastructure projects.

However, tunneling work presents several hazards and risks that need to be carefully managed to ensure the safety of workers and the success of the project. Some of the key hazards and risks in tunneling work include:

1. Cave-Ins and Collapse: Excavated tunnels can be susceptible to cave-ins or collapses, especially when the surrounding soil or rock is unstable. This risk requires proper shoring, bracing, _________ ______ ___ _____ _____ _____ _______ _________.
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