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Rockburst-preventive tunnel face structure for tunneling and rockburst-preventive tunneling method

A technology of tunnel excavation and tunnel face, which is applied in tunneling, blasting, earthwork drilling and mining, etc. It can solve problems such as unsatisfactory effects, and achieve the effect of improving the explosion effect, improving the ability to resist rockburst disasters, and easing the trend

Inactive Publication Date: 2013-11-27
CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the prevention and control measures for rockburst mainly include water spraying, advanced stress relief blasting, spraying steel fiber concrete and hanging flexible protective nets, etc.; but in engineering practice, the effect of the aforementioned protective measures is not very ideal

Method used

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  • Rockburst-preventive tunnel face structure for tunneling and rockburst-preventive tunneling method
  • Rockburst-preventive tunnel face structure for tunneling and rockburst-preventive tunneling method
  • Rockburst-preventive tunnel face structure for tunneling and rockburst-preventive tunneling method

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Embodiment Construction

[0029] An anti-rock blast face structure for tunnel excavation, including a face used for blasting and excavation operations during tunnel excavation. The shaped surface formed by cutting.

[0030] Mathematically, the analytical function expression of a sphere or ellipsoid can be shown by the following formula:

[0031]

[0032] Among them, a is the semi-major axis, b is the semi-minor axis; when corresponding to the physical size of the actual tunnel, b is the tunnel width, and the direction of a is the same as the direction of tunnel excavation; when a=b, the tunnel face is is a spherical surface; when a>b, the palm face is an ellipsoid, at this time, a is the real axis of the ellipsoid where the ellipsoid is located, and b is the imaginary axis. Later, when determining the specific positions of the cutout and the blasthole, the positions of the cutout and the blasthole can be designed first (that is, the values ​​of x and z are determined), and then substituted into the...

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Abstract

A rockburst-preventive tunnel face structure comprises tunnel faces used for blasting and excavating operations during tunneling. The improvement of the rockburst-preventive tunnel face includes that the surface of each tunnel face is in the shape of a sphere or a special-shaped face formed by intersection of an ellipsoid and a ground surface. The rockburst-preventive tunnel face has the advantages that occurrence probability of rockburst disasters can be effectively reduced, and capability of resisting the rockburst disasters can be effectively improved; meanwhile, the areas of effective free faces formed by the tunnel faces are large, so that exploding effects can be improved, disturbance damage to surrounding rocks can be reduced, and construction efficiency can be improved.

Description

technical field [0001] The invention relates to a tunnel excavation technology, in particular to a tunnel excavation anti-rockburst face structure and a rockburst-proof tunnel excavation method. Background technique [0002] Rockburst is a sudden disaster, which is especially common in the process of tunnel excavation; rockburst is extremely destructive, not only causing serious damage to the excavation working face, but also endangering the lives of construction workers and damaging engineering equipment; At present, how to effectively avoid rockburst disasters during the construction process, effectively resist rockburst disasters, and protect the safety of construction workers has become a worldwide problem that needs to be solved urgently in the field of rock underground engineering and rock mechanics. [0003] In the prior art, the prevention and control measures for rockburst mainly include water spraying, advanced stress relief blasting, spraying steel fiber concr...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D9/10F42D1/00
Inventor 陈洪凯董平廖云平
Owner CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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