CN117189160A - Reasonable setting method for construction transverse channel of ultra-large buried soft rock tunnel - Google Patents
Reasonable setting method for construction transverse channel of ultra-large buried soft rock tunnel Download PDFInfo
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- CN117189160A CN117189160A CN202311466378.6A CN202311466378A CN117189160A CN 117189160 A CN117189160 A CN 117189160A CN 202311466378 A CN202311466378 A CN 202311466378A CN 117189160 A CN117189160 A CN 117189160A
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- 238000010276 construction Methods 0.000 title claims abstract description 53
- 239000011435 rock Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000009412 basement excavation Methods 0.000 claims abstract description 15
- 238000013461 design Methods 0.000 claims abstract description 11
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 239000004567 concrete Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000011378 shotcrete Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 4
- 230000001154 acute effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to the technical field of tunnel engineering, and particularly discloses a reasonable setting method for a transverse channel of ultra-large buried soft rock tunnel construction, which comprises the following steps: determining the number of transverse channels according to engineering requirements and the maximum mechanized capability; determining the position of a transverse channel according to the lithology condition of the bottom layer; the transverse channel is arranged vertically to the positive hole; designing the cross section of the transverse channel according to the principle of minimum cross section area; determining the excavation mode of the transverse channel according to the condition of the surrounding rock on site; the design of a transverse channel supporting structure; shi Zuomo the lining is built. Under the condition of the ultra-large buried soft rock tunnel, the construction method considers the factors such as the construction period, the stratum lithology, the transverse channel setting angle, the transverse channel section, the excavation method, the support design and the like, and can give consideration to the construction period, the site construction convenience and the like, reduce the influence of the construction of the transverse channel on the pilot tunnel and ensure the safety of the tunnel structure under the condition of the ultra-large buried soft rock.
Description
Technical Field
The invention relates to the technical field of tunnel engineering, in particular to a reasonable setting method for a transverse channel of ultra-large buried soft rock tunnel construction.
Background
Along with the rapid development of the traffic construction of China, particularly in southwest areas such as a Sichuan railway and the like, ultra-large buried deep soft rock stratum is faced, the ground stress is extremely high, if surrounding rock is softer, the extrusion effect of a tunnel is more serious, the group hole effect is more obvious, the tunnel is greatly deformed, and the primary support and the secondary lining structure of the tunnel are damaged when serious. In an oversized soft rock tunnel with a buried depth, two tunnels (a flat guide and a positive tunnel) are generally connected in a construction transverse channel mode, so that the transportation efficiency in the tunnel construction process can be enhanced, the requirements of disaster prevention and rescue are met, and the construction period is shortened. But how to effectively and reasonably arrange the construction cross-channels is a challenge.
The ultra-large buried soft rock tunnel is faced with the problems of large ground stress, soft surrounding rock and the like, compared with a common tunnel, the factors considered about the arrangement of the construction transverse channels are more complex, the arrangement distance of the common tunnel transverse channels is more than 200m, the cross section is similar to a positive hole, and the cross angle of the common tunnel transverse channels and the positive hole is generally an acute angle, so that the traffic of transport vehicles can be ensured, but the excavation effect in the ultra-large buried soft rock tunnel is obvious, and the influence of the construction transverse channels on the positive hole should be possibly reduced. Therefore, the invention provides a reasonable setting method for the construction transverse channel of the ultra-large buried soft rock tunnel.
Disclosure of Invention
The invention aims to provide a reasonable setting method for a transverse channel of ultra-large buried soft rock tunnel construction, so as to enhance the transportation efficiency in the tunnel construction process, meet the requirements of disaster prevention and rescue, and reduce the construction period.
Therefore, the invention provides a reasonable setting method for a construction transverse channel of an oversized soft rock tunnel with a buried depth, which adopts the following technical scheme:
a reasonable setting method for a construction transverse channel of an oversized soft rock tunnel comprises the following steps:
determining the number of transverse channels according to engineering requirements and the maximum mechanized capability;
determining the position of a transverse channel according to the lithology condition of the bottom layer;
the transverse channel is arranged vertically to the positive hole;
designing the cross section of the transverse channel according to the principle of minimum cross section area;
determining the excavation mode of the transverse channel according to the condition of the surrounding rock on site;
the design of a transverse channel supporting structure;
shi Zuomo the lining is built.
Further, the determining the number of the transverse channels according to engineering requirements and the maximum mechanized capability specifically includes:
according to the construction period requirement of the engineering, the shorter the construction period requirement is, the more transverse channels are, wherein the number of the transverse channels cannot exceed the maximum number of the transverse channels excavated within the construction period requirement range, which is limited by the maximum mechanized capability.
Further, the determining the position of the transverse channel according to the lithology condition of the bottom layer specifically comprises the following steps:
determining the position suitable for opening the transverse channels according to geological exploration data, ensuring that the adjacent two transverse channels are provided with positive hole diameters with the distance not smaller than 5 times, and uniformly distributing the transverse channels.
Further, the cross section design of the transverse channel according to the principle of minimum cross section area specifically comprises:
the cross section of the transverse channel adopts a horseshoe-shaped cross section, and the width of the cross section is Shi Zuomo, so that the construction vehicles can normally pass after lining is built;
and corresponding space required by vehicle turning is reserved at the two intersection positions formed by the flat guide, the positive tunnel and the transverse channel, the space required by vehicle turning is arc-shaped, and the turning radius of 7m is reserved at the minimum.
Further, the excavation mode of the transverse channel is determined to be a two-step method according to the condition of surrounding rocks on site.
Further, the cross channel support structure design specifically includes:
the primary support of the supporting structure adopts full-ring construction section steel and sprayed concrete, the arch wall is provided with a self-advancing anchor rod, and the arch wall is provided with a reinforcing mesh.
Further, the thickness of the primary support of the support structure is 20-40 cm.
Further, the diameter of the self-advancing anchor rod is 30-35 mm, the length of the self-advancing anchor rod is 5-10 m, and the longitudinal distance of the setting ring of the self-advancing anchor rod is 0.8-1.2 m multiplied by 0.8-1.2 m.
Further, the diameter of the reinforcing mesh is 5-10 mm, and the grid ring of the reinforcing mesh is arranged at an X longitudinal distance of 18-25 cm and an X18-25 cm.
Further, the molded lining is made of C30 plain concrete, and the thickness of the molded lining is set to be 30-50 cm.
The beneficial effects of the invention are as follows:
the invention provides a reasonable setting method of a transverse channel suitable for construction of an oversized soft rock tunnel with a buried depth, under the condition of the oversized soft rock tunnel with the buried depth, factors such as a construction period, formation lithology, a transverse channel setting angle, a transverse channel section, an excavation method, a support design and the like are considered, the construction transverse channel setting method can give consideration to the construction period, the site construction is convenient and the like, meanwhile, the influence of the construction of the transverse channel on a positive hole is reduced, and the safety of a tunnel structure under the condition of the oversized soft rock with the buried depth can be ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 shows a reasonable setting method for a construction transverse channel of an oversized soft rock tunnel according to an embodiment of the invention;
FIG. 2 shows a schematic view of a cross-channel arrangement according to an embodiment of the invention, wherein D1 is the conductance width; d2 is the positive hole width; d3 is the transverse channel width; the minimum turning radius of the vehicle is 7m.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples.
The embodiment of the invention provides a reasonable setting method for a transverse channel of ultra-large buried soft rock tunnel construction, which is shown in fig. 1 and is a flow chart of the method, and the method specifically comprises the following steps:
and S100, determining the number of transverse channels according to engineering requirements and the maximum mechanized capability.
For ultra-large buried soft rock tunnels, the number of transverse channels is set according to the requirements of engineering construction period and the maximum field excavation capacity, if the requirements of construction period are relatively tight and the field excavation capacity is relatively high, the number of corresponding transverse channels can be increased reasonably, but the spacing of the transverse channels is not smaller than 5 times of the hole diameter of the main tunnel.
And step S200, determining the transverse channel position according to the lithology condition of the bottom layer.
The position suitable for opening the transverse channels is determined according to geological exploration data, but the arrangement interval between two adjacent transverse channels is not too small, and each transverse channel is uniformly distributed if no special condition or requirement exists.
In step S300, the lateral channel is disposed perpendicular to the hole.
Referring to fig. 2, in an oversized soft rock tunnel with a deep and buried depth, the length of the transverse channel should be reduced as much as possible, so as to minimize the influence of the excavation of the transverse channel on the pilot hole and the leveling, so that the transverse channel should be arranged perpendicular to the pilot hole, and the method can also avoid the damage caused by the unreasonable stress of the transverse channel and the pilot hole caused by the acute angle or the obtuse angle between the transverse channel and the pilot hole.
And S400, designing the cross section of the transverse channel according to the principle of minimum cross section area.
When the cross section of the cross channel is designed, the design process should be based on the principle that the cross section area is as small as possible, so as to reduce the influence of the cross channel on the pilot tunnel. As shown in fig. 2, the cross section of the transverse channel is suggested to be a horseshoe-shaped cross section, and the cross section width is Shi Zuomo after lining is built, so that the construction vehicles can normally pass. The space required by corresponding vehicle turning is reserved at the two intersection positions formed by the flat guide, the positive tunnel and the transverse channel, the arc-shaped vehicle is preferably manufactured, the turning radius of about 7m is reserved for the minimum of the large-sized loading vehicle, and surrounding rock damage caused by stress concentration can be well avoided through the arc-shaped design.
And S500, determining the excavation mode of the transverse channel according to the condition of the surrounding rock on site.
The transverse channel excavation method is selected by selecting a reasonable excavation method according to the surrounding rock condition on site, for example, a two-step method can be adopted for excavation.
Step S600, designing a transverse channel support structure.
The design of the transverse channel supporting structure, the primary support in the supporting structure can be made of I25b section steel in a full ring mode, C30 is sprayed with concrete, the thickness is 30cm, the arch wall is provided with self-advancing anchor rods with the length of 8m, phi 32mm, the setting intervals are 1.0mx1.0m (ring x longitudinal), the arch wall is provided with reinforcing steel meshes with the length of phi 8mm, and the mesh interval is set to be 20cm x 20cm. And (3) performing primary support on the inverted arch, and then filling up with C20 concrete, wherein the inverted arch surface and the arch height of the transverse channel meet the traffic requirement.
Step S700, shi Zuomo lining.
After the support structure is manufactured, monitoring measurement is enhanced, space is ensured to be applied to the mould lining, the mould lining adopts C30 plain concrete, and the thickness is 40cm.
The above embodiments are only for illustrating the present invention, not for limiting the present invention, and various changes and modifications may be made by one of ordinary skill in the relevant art without departing from the spirit and scope of the present invention, and therefore, all equivalent technical solutions are also within the scope of the present invention, and the scope of the present invention is defined by the claims.
Claims (10)
1. A reasonable setting method for a construction transverse channel of an oversized soft rock tunnel is characterized by comprising the following steps:
determining the number of transverse channels according to engineering requirements and the maximum mechanized capability;
determining the position of a transverse channel according to the lithology condition of the bottom layer;
the transverse channel is arranged vertically to the positive hole;
designing the cross section of the transverse channel according to the principle of minimum cross section area;
determining the excavation mode of the transverse channel according to the condition of the surrounding rock on site;
the design of a transverse channel supporting structure;
shi Zuomo the lining is built.
2. The method for reasonably setting the transverse channels for the construction of the ultra-large buried soft rock tunnel according to claim 1, wherein the method for determining the number of the transverse channels according to engineering requirements and the maximum mechanized capability specifically comprises the following steps:
according to the construction period requirement of the engineering, the shorter the construction period requirement is, the more transverse channels are, wherein the number of the transverse channels cannot exceed the maximum number of the transverse channels excavated within the construction period requirement range, which is limited by the maximum mechanized capability.
3. The method for reasonably setting the transverse channel for the construction of the ultra-large buried soft rock tunnel according to claim 1, wherein the determining the position of the transverse channel according to the lithology condition of the bottom layer specifically comprises the following steps:
determining the position suitable for opening the transverse channels according to geological exploration data, ensuring that the adjacent two transverse channels are provided with positive hole diameters with the distance not smaller than 5 times, and uniformly distributing the transverse channels.
4. The reasonable setting method of the cross-sectional channel for the construction of the ultra-large buried soft rock tunnel according to claim 1, wherein the cross-sectional design of the cross-sectional channel is performed according to the principle of minimum cross-sectional area, specifically comprising:
the cross section of the transverse channel adopts a horseshoe-shaped cross section, and the width of the cross section is Shi Zuomo, so that the construction vehicles can normally pass after lining is built;
and corresponding space required by vehicle turning is reserved at the two intersection positions formed by the flat guide, the positive tunnel and the transverse channel, the space required by vehicle turning is arc-shaped, and the turning radius of 7m is reserved at the minimum.
5. The reasonable setting method for the transverse channel for the construction of the ultra-large buried soft rock tunnel according to claim 1, wherein the excavation mode of the transverse channel is determined to be a two-step method according to the condition of surrounding rocks on site.
6. The reasonable setting method of the transverse channel for the construction of the ultra-large buried soft rock tunnel according to claim 1, wherein the design of the transverse channel supporting structure specifically comprises the following steps:
the primary support of the supporting structure adopts full-ring construction section steel and sprayed concrete, the arch wall is provided with a self-advancing anchor rod, and the arch wall is provided with a reinforcing mesh.
7. The reasonable setting method for the construction transverse channel of the ultra-large buried soft rock tunnel according to claim 6, wherein the thickness of the primary support of the supporting structure is 20-40 cm.
8. The reasonable setting method for the construction transverse channel of the ultra-large buried soft rock tunnel according to claim 6, wherein the diameter of the self-advancing anchor rod is 30-35 mm, the length of the self-advancing anchor rod is 5-10 m, and the setting ring x longitudinal distance of the self-advancing anchor rod is 0.8-1.2 m x 0.8-1.2 m.
9. The reasonable setting method for the construction transverse channel of the ultra-large buried soft rock tunnel according to claim 6, wherein the diameter of the reinforcing mesh is 5-10 mm, and the grid ring x longitudinal distance of the reinforcing mesh is 18-25 cm x 18-25 cm.
10. The reasonable setting method for the construction transverse channel of the ultra-large buried soft rock tunnel according to claim 1, wherein the modeling lining is made of C30 plain concrete, and the thickness is set to be 30-50 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311466378.6A CN117189160A (en) | 2023-11-07 | 2023-11-07 | Reasonable setting method for construction transverse channel of ultra-large buried soft rock tunnel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311466378.6A CN117189160A (en) | 2023-11-07 | 2023-11-07 | Reasonable setting method for construction transverse channel of ultra-large buried soft rock tunnel |
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| CN117189160A true CN117189160A (en) | 2023-12-08 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101907998B1 (en) * | 2018-05-10 | 2018-10-23 | (주)성보씨엔이 | Sequential Excavation and Reinforcement Method of Weak Rock Tunnel |
| CN110439571A (en) * | 2019-08-21 | 2019-11-12 | 中铁隧道局集团有限公司 | Flat pilot tunnel leads to the adit construction method and transverse passage-way of main tunnel |
| CN114135315A (en) * | 2021-11-22 | 2022-03-04 | 中铁十六局集团第三工程有限公司 | Advanced stress release construction method for severe large-deformation tunnel |
| CN218026960U (en) * | 2022-08-15 | 2022-12-13 | 四川省交通勘察设计研究院有限公司 | Tunnel in-tunnel connecting channel |
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| CN116816362A (en) * | 2023-08-31 | 2023-09-29 | 北京交通大学 | Supporting and reinforcing method for intersection of positive tunnel and transverse channel of ultra-large buried soft rock tunnel |
-
2023
- 2023-11-07 CN CN202311466378.6A patent/CN117189160A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101907998B1 (en) * | 2018-05-10 | 2018-10-23 | (주)성보씨엔이 | Sequential Excavation and Reinforcement Method of Weak Rock Tunnel |
| CN110439571A (en) * | 2019-08-21 | 2019-11-12 | 中铁隧道局集团有限公司 | Flat pilot tunnel leads to the adit construction method and transverse passage-way of main tunnel |
| CN114135315A (en) * | 2021-11-22 | 2022-03-04 | 中铁十六局集团第三工程有限公司 | Advanced stress release construction method for severe large-deformation tunnel |
| CN218026960U (en) * | 2022-08-15 | 2022-12-13 | 四川省交通勘察设计研究院有限公司 | Tunnel in-tunnel connecting channel |
| CN115653614A (en) * | 2022-10-31 | 2023-01-31 | 青岛市青排市政工程有限公司 | Transverse hole underground excavation process method |
| CN116816362A (en) * | 2023-08-31 | 2023-09-29 | 北京交通大学 | Supporting and reinforcing method for intersection of positive tunnel and transverse channel of ultra-large buried soft rock tunnel |
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