Hydraulic calculation of clay-based backfill and plug for the intersections of tunnels in the geological repository for HLW

Fujita, Tomoo; Sugita, Yutaka*; Takahashi, Yoshiaki*

Australian Geomechanics, 41(4), p.89 - 95, 2006/12

In this study, three-dimensional simulations of groundwater flow are conducted to investigate the sealing performance of clay-based backfill and plug at the tunnel intersection for given hydraulic conditions around the tunnels. In the analytical results, it is found that the direction of hydraulic gradient, hydraulic conductivities of concrete and backfilling materials and the position of clay plug had impact on flow condition around the EBS.