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List of products by author: K. Yashiro
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Floor Heave in Mountain Tunnels and the Effects of Countermeasures
Abstract: In mountain tunnels, the ground pressure on the tunnel lining increases during service, in some cases leading to the problems such as cracking of the tunnel lining and reduction of the inner space. Often deformation due to ground pressure develops very slowly over time and its development does not stop unless countermeasures are taken (Matsunaga et al., 2009). The problems include not only...
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Model test and trial construction of polyurea spray as the spalling prevention method of tunnel lining concrete
Abstract: Preventing concrete spalling is very important in tunnel maintenance because spalling in railway tunnels may causes a direct safety hazard to train operations. This paper deals with the applicability of sprayed polyurea as the spalling prevention method of tunnel lining concrete. The model test and trial construction have been carried out. In the model test, vertical displacement was applied at...
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