tbm passes through the surrounding rock pretreatment method of the bypass tunnel section with strong rockburst risk

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

Active Publication Date: 2018-08-07
POWERCHINA HUADONG ENG COPORATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • tbm passes through the surrounding rock pretreatment method of the bypass tunnel section with strong rockburst risk
  • tbm passes through the surrounding rock pretreatment method of the bypass 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. Such as 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 T...

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Abstract

The present invention relates to a surrounding rock pretreatment method for a TBM (tunnel boring machine) passing through a round tunnel section with high rock-burst risk. A technical solution of the present invention is as follows: the surrounding rock pretreatment method includes the following steps: 1. determining a pretreatment area, wherein an area in which a clear spacing between a to-be-constructed tunnel and an adjacent existing tunnel in a TBM tunneling direction is less than 2 times that of a tunnel diameter of the TBM to-be-constructed tunnel is the pretreatment area: 2. performing controlled blasting; 3. injecting high pressure water, and selecting part of blast holes I to perform cyclic water injection pressurizing; and 4, performing normal tunneling by 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 Patents(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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