distribution pillar
1.According to the action of cantilever rock seam on the overly- ing strata of coal body, the paper analyses the distribution rule of abutment pressure and the theoretical basis of narrow pillar drift and exploies the sup- port type of drifts in inclined and steep inclined coal seam under the condi- tion of narrow pillar drift.
2.Abstract: The distribution of cooling air which is in the grille-brick of the inner combustion hot air stove has been simulated with three dimension turbulent mathematical model so as to find a method which is used to improve the distribution of cooling air in hot air stove.The influence of differential horizontal plates on the distribution of cooling air is discussed.The results show that original big circle round field of flow in the pillar-cavity is changed into full one-way field of flow and edges gas flow,at the same time, is increased by horizontal plates.There is a different function with horizontal plates and vertical plates.To make the uniform distribution of cooling air in the hot air stove, it is necessary that horizontal plates and vertical plates are used in a combined way.
3.Abstract: In view of the complexity of air leakage form in comprehensive mechanized sublevel caving mining non-pillar compound mining field, a pressure energy testing to ventilation system adjacent to fully-mechanized sublevel caving mining working face is proceeded in Dongtan mine of Yanzhou in Shandong province, source and sink of air leakage are determined primarily, SF6 gas is released by using transient state method, the air speed of air leakage of every point and air leakage quantity in mining field and its distribution state can be determined by test and analysis.
