The formation of a normal blasting crater for the break blasting of a roadway in rock with high residual stress was investigated based on the theory of cylindrical blasting crater.

The blasting crater curves of two different charges,the relationship between blasting crater volume and charge embedment depth and crater radius,the optimum blasting crater embedment depth,the critical blasting crater embedment depth and the unit consumption of explosives were disc.

By employing the VCR mining method,the experiment of blasting funnel must be carried out on the spot in order to ensure the parameters in mining by globular dynamite charge.

To optimize the existing blasting parameters of medium-length hole drilling,a series of blasting funnel tests are carried out to provide reasonable parameters of unit wastage of explosive,the least resist distance and the most hole-bottom distance for mining design so as to improve the blasting effect and reduce mining cost.

On the basis of blasting funnel test on inverted bench,using microcomputer,a blasting CAD system of underground mine fan-shaped middle-deep holes is developed,and a method of explosive optimization is potsented.

The experiential study has researched the question how blasting cone and the improvement of throwing crest change when concentrated charge has been prolonged to linear charge, and whether the theory of the concentrated charge can be used to replace the blasting crater design of linear charge and the parameter of blastiing cone and empitical method can be used in the designing work.

The methed of testing q in blasting cone experiments is introduced in details.

At the same time, if the processing tower was evaluated with the LBB criteria, it was also shown that the tower met the principle of leaking before breaking.

The experimental scheme of combining bench balsting with crater blasting technique has been used according to the Livingston Crater Theory and the real blasting technique condition in Holinhe coal mine.