The Smooth Surface Blasting Engineering Research Of The Courtyard Tunneling

The smooth surface blasting (usual name light explodes) is an item which the nearly several dozens years develops demolishes the new technology. In courtyard tunneling, because ordinary demolishes ultra digs, owes digs the phenomenon seriously, destroys in a big way to the adjacent formation vibration, courtyard own bearing capacity bad, the working surface produces the loose rock many, is easy to occur rib spalling, is disadvantageous to the safety in production. In view of this malpractice, this article through to in the courtyard tunneling smooth surface blasting engineering research, maximum limit reduced ultra has dug, owes digs the phenomenon, reduced to the courtyard wall of a well vibration destruction, improved the courtyard to take shape the outline, strengthened the courtyard own bearing capacity, and enhanced the courtyard stability. At the same time, after the smooth surface blasting demolition the wall of a well relatively smooth, the well ventilated resistance is small, is advantageous to the safety in production; Moreover, smooth surface blasting technology cost low, the work efficiency is high, increased the economic efficiency for the company.In the YinMuSi lead-zinc mine courtyard tunneling smooth surface blasting technology example, through the computation, the reasonable spatial eye number at least is 1, the reasonable light explodes the level thickness is about 600 mm, the reasonable peripheral eye interpupillary distance is about 500 mm, the peripheral eye uses the air gap to powder charge the structure, the line charge density is 0.227 kg/m, The cut hole and the assistance hole use continuously powders charge the structure, the line charge density is 0.818 kg/m. In under the strict guarantee detonation order premise, the reasonable time-gap may obtain the good blasting effect. The cut hole time difference controls with the latter section auxiliary eye detonation in the 25～50ms scope, the peripheral eye explodes after the assistance eye, with same section blasting cap at the same time detonation, with assistance eye time difference control in 75～100ms scope. Through 1200 center-sections and 1135 center-sections implementations smooth surface blasting 10 courtyards, the confirmation present paper is practical feasible.