Hokkaido Shinkansen tunnel construction faces mud leakage challenges

Mud and soil leaked from private land during Hokkaido Shinkansen tunnel construction. The leakage occurred through old boring traces, exacerbated by the injection of foaming agents to improve soil fluidity. Construction was temporarily halted and later resumed. Experts note the difficulty in detecting all underground anomalies like boring traces beforehand, highlighting limitations in pre-construction surveys, especially on private property.