Abstract:

According to the geological conditions of the 1232(1) island coal face under goaf in Gubei Coal Mine, the FLAC-3D software was used to study the variation of strata behavior between island coal face under goaf and island coal face in usual. The result indicate that: the vertical stress can decrease of island coal face after coal mining by overlying coal seam, therefore, compared with the island coal face under solid coal, the strata behavior are not significant in island coal face under goaf. The verification of the mine site measurements showed that the strata behavior law measured with the numerical simulation is well fitted with the actual measured results, the numerical simulation method is feasible to determine the strata behavior in island coal face under goaf.

Key words: goaf, island coal face, strata behavior, numerical simulation, analysis of site measurement