Iris Publishers- Open Access Journal of Civil Engineering

Iris Publishers-  Open Access Journal of Civil Engineering


Development of the Trenchless Installations for Underground Structures in Highway Systems

There are many underground structures, such as culverts, tunnels and vehicle undercrossing in transportation systems throughout the world. These structures are used to convey water, wildlife, fish, pedestrians and vehicles. Their roles are just as important as surface structures, such as bridges. Cut-and-cover, immersing and trenchless installations are the three major methods to construct underground structures. For an installation of buried structure, the specific method should be chosen based on the factors such as geotechnical properties in subgrade, environment impact, cost and the degree of disturbance to the highway traffic above it. Currently, it is becoming more popular to use trenchless installations including tunneling methods for new structures and trenchless replacement method for existing structures. Comparing to cut-and-cover method, trenchless installations provide much less impact to the roadway traffic and the environment.

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