What does drilling and blasting mean?

A: The full name of drilling and blasting construction is "drilling and blasting construction". It refers to a construction method of blasting broken rock mass and opening caves with explosives. Most railway tunnel projects in China are adopted. Because of its earliest and longest use in mine roadway engineering, it is commonly known as "mine method".

Extension:

When drilling and blasting excavation, there are the following basic procedures: ① drilling. ② Charge blasting. ③ Ventilation. ④ Necessary construction support. ⑤ Slag, clear the field.

They form a cyclic process, which is called blasting cycle; The distance of each blasting excavation is called cyclic footage. The excavation section needs lining, and the ideal way is to blast the section of the cavern once, and then pour concrete lining from bottom to top according to the technological requirements. However, due to the instability of rock mass and the limitation of construction tools, drilling and blasting method should be used to excavate in blocks and draw lines in sections.

This scheme with different fragmentation and operation sequence is called railway tunnel construction method.

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