ABSTRACT
When excavating foundation pits, building retaining walls and constructing loops in city traffic tunnels, a lot of supporting building spaces and abandoned structures that are not used for tunnel traffic will be produced, namely, the empty layer space of traffic tunnels. After the construction of traffic tunnels is completed, the empty layer space is often filled with debris, which not only causes a waste of large underground space, but also leads to irreversible consequences and security risks. This is not in line with the overall goal of environmental protection and low carbon construction for modern cities. If the empty layer space of traffic tunnels is not reasonably developed and utilized for a long time, it will cause an immeasurable waste of urban underground space resources.
