Abstract
In order to enable construction of a long and curved small-diameter tunneling system, a new lining method using a plastic material has been studied. After consideration of requirements for the lining material, a hard-foamed plastic was selected. The relationships between the mechanical properties of the plastic and its density were investigated. Furthermore, several exoeriments were carried out to discover the properties of the foamed plastic, for example, the bending strength, the bonding strength and so on.
Experimental and theoretical studies of the hard-foamed plastic showed the potential applicability of the new lining method proposed in this paper.
