The isolated island working face is surrounded with the goaf and its Surrounding coalcolumn and goaf have a tendency of spontaneous combustion.
孤岛综放工作面四周均与采空区相连，其四周煤柱和工作面采空区易于出现自燃发火。
2
For retrieving coalcolumn of mining area in the mine of impact pressure in the coal enterprise offers the experience, takes on popularity value.
为煤炭企业冲击矿压矿井回收盘区煤柱提供了经验，具有推广价值。
3
Through surmounting solves the technology knotty problem of retrieving coalcolumn of mining area with the system mechanization mining technique. By application in mining process the effect is better.