Abstract:

A morphological and structural feature of coal beds is one of the parameters representing the complexity of coal beds such as variation in bed thickness, the coefficient of bed structure, bed form, etc. These parameters contribute to the choice of the exploration group and exploration network as well as the difficulty of coal mining. To clarify the morphological characteristics of coal beds of the Mao Khe mine, and direction for exploration and exploitation, the methods of bed thickness estimation, bed evaluation and the level of transformation coal beds, exploration network density analysis are applied. Research results show that most of the coal beds in the south wings of Mao Khe mine are in the form of simple to quite complexity structures (Mk range from 0,24 to 1,2m); bed form and mining tectonic features also indicated that coal beds belong to complexity morphology, they are bent and strong changing in beds thickness, its led to difficulty for coal mining exploration and exploitation. The opening phenomenon of fold and fracture systems developed in folded dome facilitates the process of forming coal streams, but badly affects the mining exploration, exploitation. Its arrangement of controlled exploration works, correlation with coal seams, is difficult. In order to limit the risks are mentioned above, an analysis of exploration network density by random function theorem, the selection of the appropriate probing network is carried out. Calculated results show that the coal beds in the mine can be applied rectangular network or linear network, with the exploration network for the 122 level (third exploration group): distances of exploration lines range from 150 to 200 meters, exploration works on the line range from 100 to 125 meters is perfectly suitable