Rethinking the Water Leak Incident of Tunnel LUO09 to Prepare for a Challenging Future

Figure 4

Schematic illustration for progressing the rehabilitation. Note: Soil in Regions I and II to be removed in the rehabilitation and then backfilled to the surface upon completion of the tunnel liners erection and new vehicle underpass installation. Note: soil in Regions I and II to be removed in the rehabilitation and then backfilled to the surface upon completion of the tunnel liners erection and new vehicle underpass installation. SF: backfill; SM = silty sand; CL: low plasticity clay.