Hydraulic blasting construction method for joint fissure development rock mass tunnel

Abstract

The invention discloses a hydraulic blasting construction method for a joint fissure development rock mass tunnel, and relates to the technical field of tunnel blasting engineering. The hydraulic blasting construction method is characterized by comprising the following steps that 1) a blast hole is drilled; 2) the inner wall of the blast hole is washed by adopting specially-made slurry; 3) the energy gathering pipe is filled with explosives at intervals; 4) the energy gathering pipe is installed in the blast hole, the blast hole is plugged by adopting special stemming, and a water injection pipe is reserved; 5) water is injected, the blast hole is filled with the water by using the water injection pipe; and 6) the hole is sealed by adopting the plugging stemming, and an explosion propagation wire is connected for detonation. For a joint fissure development rock mass, joint fractures on the inner wall of the blast hole can be blocked, water injected into the blast hole is prevented from being lost in a blasting preparation stage, coupled medium water evenly transfers explosion energy to be acted on rock, the coupling effect of explosives and the water is improved, the blast hole utilization rate and the blasting efficiency are improved, the explosive use amount is reduced, the dust concentration of an operation site after blasting can be reduced, the operation site environmentis improved, meanwhile, the construction efficiency is high, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of tunnel blasting engineering, in particular to a hydraulic blasting construction method for rock mass tunnels with developed joints and fissures. Background technique [0002] Tunnels are key and key projects in the construction of roads and railways. With the continuous increase of my country's infrastructure construction and the advancement of science and technology, more and more tunnels are constructed by blasting. As a high-risk operation, blasting is inseparable from blasting technology in tunnel construction of highways and railways and mining of mineral resources. [0003] At present, hydraulic blasting is gradually being popularized and applied in underground engineering such as tunnels, but it is different from hydraulic blasting in the strict sense. In the prior art, when emulsion explosives, water bags are arranged at intervals and energy-concentrating tubes are used for hydraulic blasting, t...

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Problems solved by technology

In the prior art, when emulsion explosives, water bags are arranged at intervals and energy-concentrating tubes are used for hydraulic blasting, the coupling effect of water and explosives is poor, and the superiority of hydraulic blasting technology cannot be fully reflected

[0004] In the prior art, when carrying out tunnel blasting construction, the traditional blasting method is adopted, the explosion energy transmission loss is large, the consumption of explosives is large, and the blasting effect cannot be fully exerted, and over-excavation and under-excavation are prone to occur. In addition, After detonation, the amount of dust is large, and a large amount of dust is generated to pollute the air, and the size of the blasted ballast is large, which makes the efficiency of ballast loading operation low, which makes the efficiency of tunnel construction low

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