Explosive charging method for improving shaping of horizontal stratum tunnel

Abstract

The invention relates to an explosive charging method for improving shaping of a horizontal stratum tunnel. The explosive charging method comprises the following steps of splitting each PVC pipe of which the outer diameter is D mm in a quartered manner; respectively overturning an upper annular piece and a lower annular piece for 180 degrees, and banding the upper annular piece, a right annular piece, the lower annular piece and a left annular piece in a clockwise direction by adhesive tapes; splitting an emulsion explosive cartridge of which the diameter is D mm in half; separately putting the split emulsion explosive cartridges in a groove formed in the upper annular piece and a groove formed in the lower annular piece, and separately performing fixing to obtain an explosive pipe; separately charging one explosive pipe in each of a plurality of shot holes in an excavated contour line, wherein symmetric grooves of each explosive pipe need be over against the excavated contour line; and performing exploding construction on the horizontal stratum tunnel in a normal manner. Through the adoption of the explosive charging method disclosed by the invention, the shaping quality after the explosion of the horizontal stratum tunnel can be improved; the situation of back break of the horizontal stratum tunnel is reduced; disturbance and destruction of country rock are reduced; engineering capacity and expense increased because of overbreak or underbreak are saved; the construction period is shortened; and the construction quality and the construction safety are also guaranteed.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of tunnel construction, in particular to a charge method for improving the formation of horizontal rock formation tunnels. [0003] 【Background technique】 [0004] In the construction of large-section horizontal rock railway tunnels, especially in the construction of soft-hard interlayers or thin surrounding rocks, serious over-excavation and under-excavation phenomena are easily formed, and the tunnel forming effect is very poor, which not only increases the workload, but also seriously affects the tunnel. The stability of the cavern is also related to the quality of the primary support and secondary lining. [0005] In addition, after the excavation of the tunnel, due to the poor interlayer bonding force of the large-section horizontal rock formation, the effect of traditional smooth blasting is poor. , It is easy to cause the vault to collapse and fall off, threatening the safety of tunnel constr...

AI Technical Summary

Problems solved by technology

[0005] In addition, after the excavation of the tunnel, due to the poor interlayer bonding force of the large-section horizontal rock formation, the effect of traditional smooth blasting is poor. , it is easy to cause the vault to collapse and fall off, threatening the safety of tunnel construction personnel and affecting the construction progress

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