As a special hydrogeological condition of Guotuen Coal Mine,directly clearing away scattered coal chamber of main shaft might happen water burst accident.

• 由于郭屯矿井特殊的水文地质条件,直接施工主井清理撒煤硐室可能会发生突水事故,所以在施工主井清撒硐室前,进行探水预注浆工作。