Effect of depth of cover, h: as the rock mass rating RMR values of all eighteen mines were different, a direct plot between rock load height (RLH) and depth is not possible.

History field confirms that Japanese Guandong Army is the person in direct responsibility of "Huanggu Village Explosive Case", and Japanese Army headquarters is closely related with the plot of that.

The timing plot when the! tasks are executing is particularly described. The switch of tasks is smoothly disposed by direct or indirect scheduling regime.