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In order to form a certain sectional shape of the roadway, the groove, the auxiliary hole and the boundary hole are arranged on the working surface.
B. Marking and measures of blasting effect The advantages and disadvantages of blasting effect have great influence on the speed of tunneling, the quality of roadway, the effect of support and the efficiency and efficiency of tunneling. Its effect signs and measures.
C blast hole arrangement method a blasting groove form and its choice The core of the blasthole arrangement is the choice of the sipe hole, which is the key to determine the blasting effect. Generally, the form of the gutter is selected according to the section of the roadway, the nature of the rock and the geological structure of the rock formation. The classification and applicable conditions are listed in the table.
b . Principles of Arrangement of Auxiliary Holes and Peripheral Holes These two types of blastholes should meet the following requirements:
( 1 ) The rock collapses according to the contour of the design;
( 2 ) The caving rock does not collapse the brackets and equipment;
( 3 ) The initiation of a blasthole pack does not cause the explosion or carry-over of the adjacent blasthole pack;
( 4 ) The rock mass is moderate and it is suitable for rock loading work.
To this end, the arrangement of the two types of blastholes is generally required to be uniform, on the one hand, the energy of the explosives is fully utilized, and at the same time, the above requirements are also guaranteed. The spacing is based on the blasting performance of the rock. The auxiliary hole is generally taken from 0.4 to 0.8 , the peripheral hole is 0.5 to 1 m , and the peripheral hole is taken from the roadway contour by 0.1 to 0.2 m .
When using smooth blasting, there are special requirements for the perimeter boundary.
D Determine the blasting parameters
Blasting work in common law construction
Characteristics of A roadway blasting blasting and working face blasthole The characteristics of blasting in the open blasting are that under the condition of single free surface, the depth of the blasthole is limited by the section, generally only 1.5~3.0m .