Rock burst control method for deep tunnel excavation by adopting TBM (Tunnel Boring Machine)

A rockburst and tunnel technology, applied in the field of rockburst prevention, can solve problems such as prolonging the construction period and reducing the utilization rate of TBM equipment, and achieves the effect of speeding up the construction progress, eliminating the risk of rockburst, and improving the utilization rate of equipment.

Inactive Publication Date: 2010-12-15
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology

[0004] In general, the above two technical solutions essentially give up the excavation of TBM equipment in the deep buried tunnel section and strong rock blast section, which reduces the utilization rate of TBM equipment and prolongs the construction period

Method used

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  • Rock burst control method for deep tunnel excavation by adopting TBM (Tunnel Boring Machine)
  • Rock burst control method for deep tunnel excavation by adopting TBM (Tunnel Boring Machine)
  • Rock burst control method for deep tunnel excavation by adopting TBM (Tunnel Boring Machine)

Examples

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Embodiment 2

[0026] Embodiment 2: as Figure 6 As shown, in this case, several parallel tunnels are excavated at the same time, and the construction steps are as follows:

[0027] a2: Same as step a1 in Example 1.

[0028] b2: Excavate a lateral construction branch tunnel 3 from the tunnel parallel to the excavated tunnel section 4 of the TBM to the strong rock blast tunnel section that the TBM needs to pass through, and use it as an auxiliary tunnel for the excavation of the pilot tunnel 1, and then pass through the lateral construction branch tunnel 3 Excavate a pilot tunnel 1 whose size is smaller than the TBM excavation contour line; when excavating the lateral construction branch tunnel 3, it is necessary to excavate from the advanced tunnel to the front of the backward tunnel. The rest are the same as step b1 in Example 1.

[0029] c2: same as step c1 in Example 1.

[0030] Similarly, after the above steps are completed, the risk of rockburst in the secondary excavation of the TBM...

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Abstract

The invention relates to a rock burst prevention method for deep tunnel excavation by adopting a TBM (Tunnel Boring Machine), aiming to solve the technical problem on lowering or eliminating the rock burst danger of the TBM in a strong-rock-burst tunnel section in an excavation process, improving the equipment utilization rate of the TBM and accelerating a construction schedule by means of pretreating a wall rock for the TBM to excavate. The rock burst prevention method for the deep tunnel excavation by adopting the TBM adopts the technical scheme comprising the following steps of: (a) excavating a pilot tunnel with the size smaller than the excavation contour line of the TBM in the strong-rock-burst tunnel section through which the TBM needs to pass for excavation by adopting a drilling and blasting method and monitoring microseisms before the TBM enters the potential strong-rock-burst tunnel section; and (b) releasing the stress of a strong-rock-burst part in the excavation process of the pilot tunnel and a part with potential rock-burst danger shown by microseismic monitoring. The invention is mainly used for deep hydraulic tunnels and deep traffic tunnels with high rock burst danger.

Description

technical field [0001] The invention relates to a rockburst prevention method, in particular to a rockburst prevention method for deep-buried tunnel excavation using TBM, which is mainly applicable to deep-buried hydraulic tunnels and deep-buried traffic tunnels with strong rockburst risks excavated by TBM. tunnel. Background technique [0002] For deep-buried hard rock tunnels with strong rockburst risks, rockburst control is a difficult problem, and the hard rock tunnel boring machine (TBM) has very limited means of preventing rockbursts, and it is difficult to resist extremely strong rockbursts simply relying on the support system. The impact of rockburst often requires pretreatment of the surrounding rock in the potentially strong rockburst section and the combination of rockburst prevention support systems. The two work together to achieve the purpose of rockburst prevention. [0003] There are many methods for pretreatment of surrounding rocks, among which stress reli...

Claims

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Application Information

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