2020 Volume 35 Pages 163-170
The construction of geotextile-reinforced soil (GRS) retaining wall having full-height rigid facing by RRR-B method is briefly explained, followed by the outline of the new Light Rail Transit project between Haga and Utsunomiya in Tochigi Pref. Japan. This is the first LRT project in Japan newly constructing railway structures. In this project, the GRS RWs were constructed under difficult construction conditions (i.e., a short given construction period and many divided sections over a long distance in a continuous soft ground area). The end wall face in each preceding section was constructed by placing welded wire mesh boxes filled with gravelly soil at the shoulder of each soil layer and wrapped-around with geogrid reinforcement and left until the start of construction in the next adjacent section. To avoid harmful effects of the ground settlement by the construction of a GRS RW in the next adjacent section on the completed GRS structure in the preceding section, the subsoil was improved by in-place cement-mixing.
