It is stated by authors that the multiple drilling technology of shaped charge and normal drilling methods can be applied in practice of large diameter drilling in hard rock after analyzing the merits and defects of normal drilling methods in large diameter drilling in hard rock and discussion of the principle and influential factors of shaped charge.

In this paper the method combined with energizing blasting and hydrochloric acid well washing and its principle in elevating outflow of limestone well are discussed.

In this paper the effect method of energizing blasting is proposed to clean the ashsendimentary layers in the ash transport pipelines.

Study and application of accumulative blasting in open-pit mine;

The viewpoint that accumulative blasting is a feasible technology of improving current presplit blasting, and it can realize a meticulous excavation blasting, because the accumulative blasting is not based on experience design but fracture mechanics.

Study on spliting mechanism of coal bed deep-hole cumulative blasting to improve permeability;

Research on splitting technical of coal bed deep-hole cumulative blasting to improve permeability

It describes the blasting methods and technology,and practicable cumulative blasting technology according to the features of ever\|frost ground.

This paper analyzes explosive cavity pipe at present market,it′s craft size exists shortcomings aimed to features and safety targets of explosive cavity pipe,craft size of optimizing explosive cavity pipe are raised.