“…However, generally costs are higher than construction on the land surface and, in reality, use of the underground is seldom chosen unless there is a factor such as environmental issues affecting the surrounding area. Still, underground space is used when vertical use is unavoidable due to congestion, use of the land surface for other purposes is desired or the environment on the land surface should be preserved (Nishi et al, 2000;Takasaki et al, 2000;Nakada et al, 1996;Endo, 1993;Kashima et al, 1993;Igarashi and Okumura, 1993;Matsusita et al, 1993).…”