Study on gob-side entry layout of close distance coal seams under overlaying and lateral gob conditions

The layout of the gob-side roadway has been a hot topic around the world for a long time, which is crucial to the roadway stability during roadway excavation and coal mining. The law of superposition of the dynamic stress distribution among the multiple working faces has been studied seriously by the simulation analysis of influence of the overlaying and lateral workface on the floor and the gob-side roadway according to mining sequence with the method of geological survey,umerical calculation empirical analysis and so on. The conclusion that the stress distribution spread to the floor and the gob-side roadway workface has been gained, which has aggravated the stress concentration. Besides, the reasonable dimension of coal pillar between 6m and 10m has been obtained on the basis of analyzing the stress superposition principle among multiple working faces, which has been proved good in practice. It is a method that provides a reference to the similar conditions.