Experiment is conducted to determine the optimal crushing parameter,construction technique and requirements.

Blast breaking quality is an important economic factor in the production of an open-pit iron mine,the result of the test and research on the top spacing loading blast method done to mid-deep boreholes,shows that top spacing loading method can improve breaking quality as well as reduce big piece rate,thus lowering the production cost,which is of great significance to the mine.

And the comparison was done between Weibull distribution and fractal distribution,which in order to find the relationships between the influence parameters and the coal fragmentation characteristic index,the coal fragmentation degree parameter and the fractal dimension.

This paper is to study the efficiency of drilling equipments in tunneling rocks, to elaborate the development process of drilling equipments, and to discover the mechnical principles in rcok disintegration and energy capacity which is determined by the loading bearing of the bored well face.