The results of shot-delay blasting application in aspects of decreasingblasting-shake and ensuring safety of tunnel &drop shaft are discussed.

Study on the Adit Stability Under Dynamic Blasting Load;

This paper introduces the method for directive generation of adit graphic files with the information from multiple sources acquired during tunnel construction using MAPGIS component technology.

In combination with rock permeability in dam region of a hydroelectric plant,the paper introduces a method directly evaluating rock permeability coeffieient--adit sonic wave hole seepage test and gives test device,test procedure,estimate principle and result.

It was considered to be feasible applying natural draft ventilation in small mine applying adit devebopment in mountainous region , in particular environment .