CN208996733U - A kind of stress relieving structure of tunnel rockburst risk - Google Patents
A kind of stress relieving structure of tunnel rockburst risk Download PDFInfo
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- CN208996733U CN208996733U CN201821380499.3U CN201821380499U CN208996733U CN 208996733 U CN208996733 U CN 208996733U CN 201821380499 U CN201821380499 U CN 201821380499U CN 208996733 U CN208996733 U CN 208996733U
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- pilot tunnel
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- rockburst risk
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Abstract
The utility model provides a kind of stress relieving structure of tunnel rockburst risk, including the first pilot tunnel and multiple blast holes excavated from tunnel face bottom centre；First pilot tunnel extends along tunnel construction direction, the edge distribution that digs cross section of the blast hole along tunnel face and first pilot tunnel；Wherein, the explosion hole depth connecting with first pilot tunnel is more than the stress concentration region in front of first pilot tunnel enough.The utility model arranges stress relieving blast hole using first pilot tunnel, the range and depth of stress relieving are increased simultaneously, it can effectively avoid underground engineering big cross section and dig the strong rock burst of bring, and the excavation of light section elder generation pilot tunnel can also assist reducing rockburst risk, shortening is slagged tap the time, convenient to implement supporting measure rapidly, guarantees driving speed under the conditions of strong rockburst risk, the safety of effective guarantee construction personnel and equipment improve drivage efficiency.
Description
Technical field
The utility model relates to deep-lying tunnel fields, and in particular to a kind of stress relieving knot for coping with tunnel rockburst risk
Structure.
Background technique
Seek the control method to rockburst risk always since rock burst, in engineering practice, it is especially close several
The fast development of year deep-buried rock engineering, the Rockburst Problem in engineering in the urgent need to address, but so far still can not accurate forecast
Rockburst risk in engineering can only be controlled by the research understanding obtained to Rockburst Problem and the technological means being constantly progressive
The harm of rock burst processed.
Rock burst is that a kind of surrounding rock failure that rock mass self-energy caused by excavating is discharged and generated when being propagated by shock wave is existing
As rockburst control is exactly the generation for making great efforts to avoid this destruction.Current generally understanding is there are two the approach of control rock burst one
It is to reduce exergonic intensity, second is that reinforcing the impact resistance of country rock, still maintains good under the impact of shock wave
Stable state.This basic understandings constitutes the basis of rock burst research and field conduct, this is also the basic of all rockburst controls
Principle and thinking.
With the raising of rockburst risk, bearing capacity and impact resistance to support system all constantly enhance.However supporting
It is always limited, also need other measures help to control rockburst risk in reality, stress relieving explosion be exactly means therein it
One.It is played with supporting and improves load-carrying capacity of surrounding rock and impact resistance the difference is that stress relieving blasting technique is by changing rock
The stress of body reduces the energy release of stress concentration region, can relatively efficiently control rockburst risk.However, now deep
The excavated section for burying engineering is generally larger, causes stress concentration more serious, and the impact energy of rock burst will be huger, and
And stress relieving explosion is carried out in such big cross section, not only risk is higher, and the time needed is longer, and dose is more, undoubtedly
The risk of rock burst will be further increased.If directly carrying out stress relieving explosion in the case, not only effect is undesirable, Er Qiecun
In biggish security risk, it is therefore desirable to carry out certain improvement to existing stress relieving blasting technique, meet in strong rock burst
Requirement under risk conditions.
Utility model content
The purpose of the utility model is to overcome disadvantages existing in the prior art, provide a kind of suitable for tunnel of large section
Stress relieving structure under strong rockburst risk, to make up the deficiency that traditional stress relieving blasting technique is applied with this condition,
Rockburst risk is effectively reduced, guarantees construction personnel and equipment safety, improves drivage efficiency.
To achieve the goals above, the technical solution adopted in the utility model is as follows:
A kind of stress relieving structure of tunnel rockburst risk, including the first pilot tunnel that is excavated from tunnel face bottom centre with
And multiple blast holes；First pilot tunnel extends along tunnel construction direction, and blast hole digs cross section along tunnel face and first pilot tunnel
Edge distribution；Wherein, the explosion hole depth connecting with first pilot tunnel is more than the stress concentration region in front of first pilot tunnel enough.
Further, blast hole is integrally in radial outward.
Further, the angle between blast hole and the axis or canal axes of first pilot tunnel is 15 °.
Further, the hole diameter of first pilot tunnel is not more than 3m, of length no more than 5m.
Further, the depth of blast hole is at least 1.5 times of first pilot tunnel hole diameter.
Further, the excavation face of first pilot tunnel is using the tunnel construction middle line on tunnel face as symmetry axis bilateral symmetry.
The utility model arranges stress relieving blast hole using first pilot tunnel, while increasing the range and depth of stress relieving
Degree, can effectively avoid underground engineering big cross section and digs the strong rock burst of bring, solve single stress relieving explosion above-mentioned two
The deficiency of a aspect.Also, the excavation of light section elder generation pilot tunnel can also assist reducing rockburst risk, and shortening is slagged tap the time, convenient
Implement supporting measure rapidly, realize immediate support, not only reduces the requirement of surrounding rock supporting, mitigates supporting pressure, but also can protect
Driving speed under the conditions of strong rockburst risk is demonstrate,proved, the safety of effective guarantee construction personnel and equipment improve drivage efficiency.
Detailed description of the invention
Fig. 1 is the front view of the utility model.
Fig. 2 is the side view of the utility model.
Specific embodiment
The utility model will be further described with reference to the accompanying drawing.
Referring to attached drawing.The utility model is equipped with the first pilot tunnel 2 and multiple blast holes 3 excavated in tunnel face 1.Guide
The excavation face in hole 2 is in 1 bottom centre of tunnel face, specifically, the excavation face of first pilot tunnel 2 is with the tunnel on tunnel face 1
Middle line construct as symmetry axis bilateral symmetry in hole.First pilot tunnel 2 extends along tunnel construction direction, i.e., the axis and tunnel axis of first pilot tunnel 2
Line is parallel.Blast hole 3 is spaced apart along the edge for digging cross section 4 of tunnel face 1 and first pilot tunnel, specifically, is set to tunnel
The top and two sides of hole face 1, the top and two sides for digging cross section 4.Wherein, the depth of blast hole 3 is at least 1.5
2 hole diameter of first pilot tunnel again, and the explosion hole depth connecting with first pilot tunnel 2 should be more than the stress concentration in first 2 front of pilot tunnel enough
Area.
Particularly, blast hole 3 intersects with the axis of first pilot tunnel 2 or tunnel, and angle between the two is 15 °, and blast hole 3
Whole is in radial outward, to increase the range and depth of stress relieving, to be preferably suitable for the strong of tunnel of large section
Rock burst.The bottom of blast hole 3 is equipped with the powder charge section 5 for loading explosive.
The hole diameter of first pilot tunnel 2 in the present embodiment is not more than 3m, of length no more than 5m.It therefore, so both can be with guarantor
The construction operation of member, can also reduce rockburst risk；Meanwhile facilitating in first pilot tunnel and implementing supporting rapidly, guarantee facing for tunnel
When safety problem.
It should be pointed out that the embodiments of the present invention are described above.However, the technical staff of art technology should manage
Solution, the present utility model is not limited to the above embodiments, only illustrates the principles of the present invention described in above-described embodiment,
There are many changes and improvements for the utility model also meeting under the premise of not departing from the scope of the utility model, these changes and improvements are all
It falls within the scope of the claimed invention.
Claims (6)
1. a kind of stress relieving structure of tunnel rockburst risk, it is characterised in that including what is excavated from tunnel face bottom centre
First pilot tunnel and multiple blast holes；Elder generation's pilot tunnel extends along the tunnel construction direction, and the blast hole is slapped along the tunnel
The edge distribution for digging cross section in sub- face and the first pilot tunnel；Wherein, the explosion hole depth connecting with the first pilot tunnel is enough
More than the stress concentration region in front of the first pilot tunnel.
2. a kind of stress relieving structure of tunnel rockburst risk as described in claim 1, it is characterised in that the blast hole is whole
Body is in radial outward.
3. a kind of stress relieving structure of tunnel rockburst risk as claimed in claim 2, it is characterised in that the blast hole with
Angle between the axis or the canal axes of elder generation's pilot tunnel is 15 °.
4. a kind of stress relieving structure of tunnel rockburst risk as described in claim 1, it is characterised in that elder generation's pilot tunnel
Hole diameter is not more than 3m, of length no more than 5m.
5. a kind of stress relieving structure of tunnel rockburst risk as described in claim 1, it is characterised in that the blast hole
Depth is at least 1.5 times of first pilot tunnel hole diameter.
6. a kind of stress relieving structure of tunnel rockburst risk as described in claim 1, it is characterised in that elder generation's pilot tunnel
Excavation face is using the tunnel construction middle line on the tunnel face as symmetry axis bilateral symmetry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821380499.3U CN208996733U (en) | 2018-08-27 | 2018-08-27 | A kind of stress relieving structure of tunnel rockburst risk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821380499.3U CN208996733U (en) | 2018-08-27 | 2018-08-27 | A kind of stress relieving structure of tunnel rockburst risk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208996733U true CN208996733U (en) | 2019-06-18 |
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ID=66799663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821380499.3U Active CN208996733U (en) | 2018-08-27 | 2018-08-27 | A kind of stress relieving structure of tunnel rockburst risk |
Country Status (1)
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| CN (1) | CN208996733U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110307003A (en) * | 2019-08-12 | 2019-10-08 | 中铁二院工程集团有限责任公司 | Suitable for preventing the pressure release pilot tunnel and its construction method of tunnel bottom deformation |
| CN112610224A (en) * | 2021-01-07 | 2021-04-06 | 云南路桥股份有限公司 | Steep wall tunnel core hole digging construction process |
| CN113982602A (en) * | 2021-10-26 | 2022-01-28 | 重庆城建控股(集团)有限责任公司 | Tunnel construction method based on longitudinal and transverse pilot tunnel combination |
-
2018
- 2018-08-27 CN CN201821380499.3U patent/CN208996733U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110307003A (en) * | 2019-08-12 | 2019-10-08 | 中铁二院工程集团有限责任公司 | Suitable for preventing the pressure release pilot tunnel and its construction method of tunnel bottom deformation |
| CN110307003B (en) * | 2019-08-12 | 2024-04-12 | 中铁二院工程集团有限责任公司 | Pressure relief pilot tunnel suitable for preventing tunnel bottom from deforming and construction method thereof |
| CN112610224A (en) * | 2021-01-07 | 2021-04-06 | 云南路桥股份有限公司 | Steep wall tunnel core hole digging construction process |
| CN113982602A (en) * | 2021-10-26 | 2022-01-28 | 重庆城建控股(集团)有限责任公司 | Tunnel construction method based on longitudinal and transverse pilot tunnel combination |
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