THE DETERMINATION OF THE CRACKED FIELD ON COAL FACE

The study of the ample coal's width and the cracked field of lower mined-out space is an important measure to prevent lower coalface from heavy water wwhen there is water in the above mined-out space.This article uses resemble model experiment,geological radar and 3D-δ limited program to study the cracked field of 112 coalface of Ties han-nan mine in order to avoid heavy water.