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Construction method for controlling rock pillar type rock burst in process of double-head tunneling deep-buried tunnel transfixion

A construction method and tunnel technology, applied in tunnels, earthwork drilling, mining equipment, etc., can solve the problems of increased potential rockburst risk, increased potential rockburst risk, etc., to improve safety, unaffected construction progress, The effect of eliminating the risk of rockburst of rock pillar type

Active Publication Date: 2012-10-31
POWERCHINA HUADONG ENG COPORATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rock pillars are formed when the two working faces approach each other. When the distance between the two working faces is close to 60m, the potential rockburst risk increases, which brings great risks to the excavation work. When the distance between the two working faces When the distance is close to 45m, the potential risk of rockburst increases sharply, and the normal drilling and blasting method cannot successfully complete the tunneling work, so special technical solutions must be used to complete the tunnel penetration work

Method used

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  • Construction method for controlling rock pillar type rock burst in process of double-head tunneling deep-buried tunnel transfixion
  • Construction method for controlling rock pillar type rock burst in process of double-head tunneling deep-buried tunnel transfixion
  • Construction method for controlling rock pillar type rock burst in process of double-head tunneling deep-buried tunnel transfixion

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Embodiment 1

[0026] Embodiment 1: as figure 1 As shown, this embodiment is mainly aimed at excavating tunnels with a diameter less than 8m, and the rock burst during the penetration process can be effectively controlled by the following measures:

[0027] a. When the distance L between the two tunnel faces is 50m, stop the excavation work on one tunnel face, and change the excavation at both ends to single-head excavation.

[0028] b. Complete the drilling work of conventional tunneling blasting and stress relief blasting in sequence, and complete the charging and sealing of each blasting hole after drilling; the hole diameter, hole depth and charge of conventional tunneling blasting holes should meet the requirements of tunneling. The blasting footage is 1.8m-2m / blasting cycle requirements, that is, the footage of one blasting cycle is 1.8-2m (the same below); the layout of stress relief blasting hole 1 is as follows: Figure 2-Figure 4 As shown, there are three rows of upper, middle and...

Embodiment 2

[0032] Embodiment 2: as Figure 5 As shown, this embodiment is mainly aimed at excavating tunnels with a diameter greater than 8m. The difference between it and Embodiment 1 is that the pilot tunnel 2 is used and the layout of the stress relief blast hole 1 is adjusted. The specific measures are as follows:

[0033] a. When the distance L between the two tunnel faces is 80m, stop the excavation work on one tunnel face, change the excavation at both ends to single-head tunneling, and excavate a pilot hole on the upper face of the single-head tunneling 2 , in order to facilitate the control of rockbursts, the cross-section of the pilot tunnel 2 in this example is arranged in the shape of a city gate with a diameter of 5m*5m.

[0034] b. Complete the drilling work of the conventional excavation blasting and stress relief blasting of the pilot tunnel 2 in sequence, and complete the charging and sealing work of each blasting hole after the drilling is completed; the aperture, hole ...

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Abstract

The invention relates to a construction method for controlling rock pillar type rock burst in the process of double-head tunneling deep-buried tunnel transfixion, aiming to providing a construction method for controlling rock pillar type rock burst in the process of double-head tunneling deep-buried tunnel transfixion to pretreat surrounding rocks, eliminate risks of the rock pillar type rock burst and ensure the construction safety and progress. Based on the technical scheme for solving the problem, the construction method for controlling the rock pillar type rock burst in the process of double-head tunneling deep-buried tunnel transfixion comprises the following steps of: firstly, changing double-head tunneling into single-head tunneling; secondly, conventional tunneling blasting with the tunneling blasting footage of 1.8-2m / blasting cycle; thirdly, stress relief blasting; fourthly, discharging slag, finishing support to carry out next conventional tunneling blasting and stress relief blasting until transfixing a whole rock pillar. The invention is mainly used for double-head tunneling a deep-buried traffic tunnel and a deep-buried hydraulic tunnel.

Description

technical field [0001] The invention relates to a method for preventing and controlling rock bursts, in particular to a construction method for controlling rock bursts during the penetration process of a deep buried tunnel driven at both ends, and is mainly applicable to deep buried traffic tunnels and deep buried water tunnels driven at both ends. construction tunnel. Background technique [0002] Pillar-type rockburst was first observed and defined in deep-buried mines, and refers to severe impact damage caused by the energy accumulated inside the rock pillar exceeding the range that the surrounding rock can bear. Later, during the penetration process of some deep-buried tunnels excavated at both ends, the two tunnel faces continued to approach, forming rock pillars similar to those formed in the mining process. Due to stress concentration and energy accumulation, potential rock burst (Pillar burst) may be triggered, which brings great threats and disturbances to personne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00
Inventor 张春生褚卫江侯靖
Owner POWERCHINA HUADONG ENG COPORATION LTD
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