👉 In geology, intrenchments are the process of excavating a trench or excavation for the purpose of constructing a tunnel. They can be used to access underground resources such as coal, oil, and gas, which require long tunnels that can be difficult to construct without digging trenches. Trenches can be dug using various methods such as blasting,夯击，或使用机械工具。在某些情况下，intrenchments may involve the use of a concrete or other material to fill the hole with
