Surrounding rock pre-treatment method for TBM passing through round-tunnel section with strong rockburst risk

A pretreatment and rockburst technology, applied in blasting, earth-moving drilling, mining equipment, etc., can solve problems such as high rockburst risk, achieve safe construction environment, relax rock mass, and reduce stress concentration.

Active Publication Date: 2016-10-12
POWERCHINA HUADONG ENG COPORATION LTD
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  • Abstract
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Problems solved by technology

[0002] For deep-buried tunnels, if the distance between the holes is too small, the rock pillars between the two holes will have a high-stress area due to stress concentration, which tends to accumulate energy, so there is a higher risk of rockbursts

Method used

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  • Surrounding rock pre-treatment method for TBM passing through round-tunnel section with strong rockburst risk
  • Surrounding rock pre-treatment method for TBM passing through round-tunnel section with strong rockburst risk

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Embodiment Construction

[0020] This embodiment is a surrounding rock pretreatment method for a TBM to bypass a tunnel section with a strong rockburst risk. like figure 1 , figure 2 As shown, when the clear distance between the bypass tunnel 1 and the planned tunnel 22 on the TBM excavation design line is small, and there is a strong risk of rockburst during the excavation of the existing tunnel 1 (bypass tunnel), it can be Adopt the method of present embodiment to carry out pretreatment to the surrounding rock of this tunnel section, concrete steps are as follows:

[0021] 1. Determine the pretreatment area. The area where the net distance between the tunnel 22 to be constructed and the adjacent existing tunnel 1 is less than 2 times the diameter (D) of the tunnel 22 to be constructed by the TBM in the direction of TBM excavation is the pretreatment area. The pretreatment area is divided into a construction section of 10m, and the construction is carried out in sections.

[0022] 2. When the TBM ...

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Abstract

The invention relates to a surround rock pre-treatment method for TBM passing through a round-tunnel section with a strong rockburst risk, and aims at eliminating the rockburst risk since a high-stress region cannot be formed in the surround rock between two tunnels when TBM passes through the region. According to the technical scheme, the method comprises the following steps of: 1, determining a pre-treatment region of which the clear spacing between a to-be-constructed tunnel and an adjacent existing tunnel in the TBM tunnelling direction is less than twice to-be-constructed tunnel diameter of TBM; 2, performing controlled bursting; 2.1, distributing multiple rows of bursting holes I in the to-be-treated region and the rock pillar region between the existing tunnel and the to-be-constructed tunnel through the existing tunnel; 2.2, distributing multiple rows of bursting holes II in the arch crown of the to-be-constructed tunnel and the spandrel part, far from the existing tunnel side, of the to-be-constructed tunnel through the existing tunnel; 2.3, bursting the bursting holes I, then bursting the bursting hole II; 3, injecting high-pressure water, selecting partial bursting holes I to carry out circulating water injection and pressurization; and 4, carrying out normal tunnelling of the TBM.

Description

technical field [0001] The invention relates to a surrounding rock pretreatment method for a TBM to bypass a section of a tunnel with a strong risk of rockburst. Background technique [0002] For deep-buried tunnels, if the distance between the holes is too small, the rock pillars between the two holes will have a high-stress area due to stress concentration, which tends to accumulate energy, so there is a higher risk of rockbursts. When the TBM passes through adjacent tunnels, if the clear distance between the two tunnels is too small, the risk of rockburst will be significantly increased. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a surrounding rock pretreatment method in which a TBM passes through a section of a tunnel with a strong rockburst risk in view of the above existing problems, so that when the TBM passes through this area, the surrounding rock between the two holes High stress areas cannot be f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21F17/00F42D1/00
CPCE21D9/00E21D9/006E21F17/00F42D1/00E21D9/001E21D9/10
Inventor 褚卫江张春生侯靖周勇陈平志
Owner POWERCHINA HUADONG ENG COPORATION LTD
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