| The paper applied the theory of detonation and stress wave of blasting. The technology of smooth blasting in the tunnel of soft rock is the research subject. The principle of soft rock smooth blasting and the character of destruction soft rock blasting were studied profoundly. Smooth blasting parameters were analyed theoretically and put forward the distance of hole in the tunnel of soft rock, the hole of dense quotient and the thickness of the section of smooth blasting parameters and so on how to calculate.The soft bedding of projectile filling is very popular method in smooth blasting. Profound study the soft bedding of projectile filling and affirm properly the parameters of bedding of projectile filling by this passage. According to the structure rarefaction of blasting rock, block structure, the low of intensity, the low of stable and the small of the quotient of rock stability, device periphery the arced section of hole of the distance of hole is 370mm, the hole distance of lateral part is 400mm. applying with axial water bedding unlinking projectile filling above the top of explosive in periphery smooth blasting. Prot hole was sealed by clay abut 400mm before blasting cap with explosive fit into the bottom of hole. At the same time, rigidly control the explosion of density periphery, abut 83.3~125g/m.In project with periphery control smooth blasting in the tunnel of soft rock in Yiqiao coal mine, shangdong. Flat break block, the pile of blasting assembles, suitable to dirt loader. The average thickness of max over dig was less than 100mm. The quality of project is perfect. The utilization ration of hole reach 94.4%~100% Certify the rationality and correctly of the calculation of theory.The research of achievement of this passage provides reference validly in the project of smooth blasting.
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