Rock pillar rockburst step-by-step relief water filling blasting method in deep-buried tunnel penetrating process

Abstract

The invention relates to a rock pillar rockburst step-by-step relief water filling blasting method in a deep-buried tunnel penetrating process. The method aims at rockburst control and solves the construction safety and construction progress problems caused by strong rockblast. The method adopts the technical scheme that a, when the rock pillar thickness between the two tunnels is 30m, the digging is stopped; and a group of blast holes penetrating through the whole rock pillars are horizontally drilled in the digging surface of one tunnel; b, powder charging is respectively carried out in the depth ranges being 12 to 13m and 17 to 18m from the hole openings, and the two powder charging sections are simultaneously initiated; c, the powder charging is respectively carried out in the depth ranges being 7 to 8m and 22 to 23m from the hole openings, and the two powder charging sections are simultaneously initiated; and d, the powder charging is respectively carried out in the depth ranges being 2 to 3m and 27 to 28m from the hole openings, the total blasting intensity is controlled to be 0.07kg / T, the two powder charging sections are simultaneously initiated, and the slag tapping is carried out after the blasting completion until the tunnel penetration is completed. The method is applicable to underground engineering of hydraulic and hydro-power engineering, traffics, coal mines and the like.

Description

technical field

[0001] The invention relates to a water-injection blasting method for step-by-step removal of rock-pillar-type rockbursts during the penetration process of a deep-buried tunnel, and is mainly applicable to underground projects such as water conservancy and hydropower projects, transportation, and mines. Background technique

[0002] Rockburst is the destruction of surrounding rock caused by the sudden release of potential energy or strain energy accumulated in the rock mass during the excavation process of underground engineering, which can lead to casualties, damage to the working face or equipment, and its basic characteristics are sudden and violent. The rock pillar refers to the rock mass between two or several underground caverns during excavation. The rock pillar when the tunnel is penetrated refers to the residual rock mass between two oppositely excavated caverns. During the excavation of the tunnel, the residual rock pillar will become thinner and th...

Examples

Embodiment Construction

[0017] Such as Figure 1-Figure 3 As shown, in this embodiment, before the deep tunnel is penetrated, through a series of orderly working methods such as rationally arranging the blast holes and their detonation sequence, the properties of the rock mass are changed, and the energy accumulation of the rock pillar is eliminated or reduced, so as to control this Type of rock pillar type rockburst purpose. First detonate the explosives in the inner rock mass, release its stress to the surrounding deep rock mass, and then extend outward in turn, slowly release the stress of the rock pillars to the deep part of the rock walls on both sides and the bottom of the cave roof. Water must be injected for a period of time to moisten the rock mass and reduce the possibility of rockbursts.

[0018] The specific steps are as follows:

[0019] a. For the two underground tunnels 1 that are being excavated in opposite directions at the same time, when the thickness of the rock pillar 2 between...

technical field

[0001] The invention relates to a water-injection blasting method for step-by-step removal of rock-pillar-type rockbursts during the penetration process of a deep-buried tunnel, and is mainly applicable to underground projects such as water conservancy and hydropower projects, transportation, and mines. Background technique

[0002] Rockburst is the destruction of surrounding rock caused by the sudden release of potential energy or strain energy accumulated in the rock mass during the excavation process of underground engineering, which can lead to casualties, damage to the working face or equipment, and its basic characteristics are sudden and violent. The rock pillar refers to the rock mass between two or several underground caverns during excavation. The rock pillar when the tunnel is penetrated refers to the residual rock mass between two oppositely excavated caverns. During the excavation of the tunnel, the residual rock pillar will become thinner and th...

Examples

Embodiment Construction

[0017] Such as Figure 1-Figure 3 As shown, in this embodiment, before the deep tunnel is penetrated, through a series of orderly working methods such as rationally arranging the blast holes and their detonation sequence, the properties of the rock mass are changed, and the energy accumulation of the rock pillar is eliminated or reduced, so as to control this Type of rock pillar type rockburst purpose. First detonate the explosives in the inner rock mass, release its stress to the surrounding deep rock mass, and then extend outward in turn, slowly release the stress of the rock pillars to the deep part of the rock walls on both sides and the bottom of the cave roof. Water must be injected for a period of time to moisten the rock mass and reduce the possibility of rockbursts.

[0018] The specific steps are as follows:

[0019] a. For the two underground tunnels 1 that are being excavated in opposite directions at the same time, when the thickness of the rock pillar 2 between...

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