CN210264727U - Pressure relief pilot tunnel capable of preventing deformation of tunnel bottom - Google Patents
Pressure relief pilot tunnel capable of preventing deformation of tunnel bottom Download PDFInfo
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- CN210264727U CN210264727U CN201921302325.XU CN201921302325U CN210264727U CN 210264727 U CN210264727 U CN 210264727U CN 201921302325 U CN201921302325 U CN 201921302325U CN 210264727 U CN210264727 U CN 210264727U
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Abstract
The utility model discloses a pressure release pilot tunnel that preventable tunnel bottom warp, including being located tunnel positive hole left side below and/or the vertical pressure release pilot tunnel of the right side below, every vertical pressure release pilot tunnel is 30m-50m, every with the distance of tunnel positive hole central line all be equipped with flexible supporting construction in the vertical pressure release pilot tunnel. The longitudinal pressure relief guide hole of the utility model can release and dissipate the deep surrounding rock pressure through deformation, thereby ensuring the stable structure of the tunnel bottom; the longitudinal pressure relief pilot tunnel adopts a flexible supporting structure, so that a larger deformation space can be provided, and the stability of the tunnel bottom structure is ensured; furthermore, the distance between the longitudinal pressure relief pilot tunnel and the tunnel main tunnel is more than 30m, so that the tunnel main tunnel is prevented from being damaged in the longitudinal pressure relief pilot tunnel construction.
Description
Technical Field
The utility model relates to a tunnel engineering construction technical field, in particular to pressure release pilot tunnel that preventable tunnel bottom warp.
Background
The ballastless track has high requirements on the stability of the tunnel base, and if the deformation of the base is too large, the ballastless track is inevitably damaged, and the operation of the high-speed railway tunnel is influenced. The tunnel bottom uplift is easy to occur when the tunnel passes through a weak and high ground stress stratum and a gentle dip rock stratum, and the currently adopted technical means is to optimize the bottom structure of the tunnel, for example, increase the rise-to-span ratio of the bottom of the tunnel and increase the excavation depth of the bottom of the tunnel; the inverted arch is thickened, and the structural rigidity is improved; additionally arranging base treatment measures such as a tunnel bottom anchor rod, a tree root pile and the like. When carrying out tunnel structure optimization, can also increase ballastless track fastener adjustment range, offset later stage tunnel upwelling volume through increase fastener deflection.
However, the excavation and support of the tunnel structure can cause multiple times of stress redistribution of surrounding rocks, and the deformation of the surrounding rocks at the bottom of the tunnel usually comes from the deep surrounding rocks. Therefore, it is difficult to radically control the long-term deformation of the surrounding rock only by means of adjusting the tunnel bottom structure and the deformation amount of the rail fastener.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, provide a pressure release pilot tunnel that can prevent tunnel bottom deformation.
In order to achieve the purpose of the invention, the utility model provides the following technical scheme:
the pressure relief pilot tunnel capable of preventing deformation of the bottom of the tunnel comprises longitudinal pressure relief pilot tunnels positioned on the left lower side and/or the right lower side of a tunnel main tunnel, the distance between each longitudinal pressure relief pilot tunnel and the central line of the tunnel main tunnel is 30-50 m, and a flexible supporting structure is arranged in each longitudinal pressure relief pilot tunnel.
Vertical pressure release pilot tunnel can be through warping, release and the effect of dissipation deep country rock pressure ensure tunnel bottom stable in structure. And the longitudinal pressure relief pilot tunnel adopts a flexible supporting structure, so that a larger deformation space can be provided, and the stability of the tunnel bottom structure is ensured. Furthermore, the distance between the longitudinal pressure relief pilot tunnel and the tunnel main tunnel is more than 30m, so that the tunnel main tunnel is prevented from being damaged in the longitudinal pressure relief pilot tunnel construction.
Preferably, the flexible supporting structure comprises an anchor net jet lining.
Preferably, the flexible supporting structure comprises a full-ring four-limb grid steel frame.
Preferably, the flexible supporting structure comprises concrete sprayed on a full-circle limb grid steel frame.
Preferably, the concrete is steel fiber concrete.
Preferably, the height of the top of the longitudinal pressure relief pilot tunnel is lower than that of the tunnel bottom of the tunnel main tunnel by within 10m, so that a transverse channel for communicating the tunnel main tunnel with the longitudinal pressure relief pilot tunnel is convenient to construct, and the gradient of the transverse channel is generally controlled within 10 degrees.
Preferably, the longitudinal length of the longitudinal pressure relief pilot hole is greater than or equal to 50m, so that a sufficient deformable space is ensured.
Preferably, the longitudinal length of the longitudinal pressure relief guide hole is 50m-100 m.
Preferably, the width of the longitudinal pressure relief pilot hole is 3m-5m, and the height of the longitudinal pressure relief pilot hole is 3m-5m, so that a sufficient deformable space is ensured.
Compared with the prior art, the beneficial effects of the utility model are that:
vertical pressure release pilot tunnel can be through warping, release and the effect of dissipation deep country rock pressure ensure tunnel bottom stable in structure. And the longitudinal pressure relief pilot tunnel adopts a flexible supporting structure, so that a larger deformation space can be provided, and the stability of the tunnel bottom structure is ensured. Furthermore, the distance between the longitudinal pressure relief pilot tunnel and the tunnel main tunnel is more than 30m, so that the tunnel main tunnel is prevented from being damaged in the longitudinal pressure relief pilot tunnel construction.
Description of the drawings:
fig. 1 is a schematic structural view of a pressure relief pilot tunnel capable of preventing deformation of a tunnel bottom according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural view of another pressure relief pilot tunnel capable of preventing deformation of a tunnel bottom according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of a monitoring system according to embodiment 1 of the present invention.
Fig. 4 is a schematic structural view of another pressure relief pilot tunnel capable of preventing deformation of a tunnel bottom according to embodiment 2 of the present invention.
The labels in the figure are: 1-tunnel positive hole, 2-longitudinal pressure relief pilot hole, 3-transverse channel, 4-deep hole and 5-displacement meter.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. However, it should not be understood that the scope of the above-mentioned subject matter is limited to the following embodiments, and all the technologies realized based on the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1 or fig. 2, a pressure relief pilot hole capable of preventing deformation of a tunnel bottom includes a longitudinal pressure relief pilot hole 2 located at a lower left or lower right of a tunnel main hole 1.
The distance between each longitudinal pressure relief pilot tunnel 2 and the central line of the tunnel main tunnel 1 is 30-50 m, and the height of the tunnel top is lower than that of the tunnel bottom of the tunnel main tunnel 1 by less than 10 m. The inner clearance of each longitudinal pressure relief guide hole 2 is about 4.5m multiplied by 5.0m (width multiplied by height), the longitudinal length is 50m-100m, and the longitudinal length can be determined according to the accumulated deformation value of the deformation monitoring device.
Each longitudinal pressure relief pilot tunnel 2 is internally provided with a flexible supporting structure, specifically, in order to release and dissipate deep surrounding rock pressure through deformation, an anchor net is adopted in each longitudinal pressure relief pilot tunnel 2 for spraying and lining, a full-ring four-limb grid steel frame is arranged in primary support, and primary sprayed concrete is made of steel fiber concrete.
The method for determining the longitudinal length of the longitudinal pressure relief pilot hole 2 according to the accumulated deformation value of the deformation monitoring device comprises the following steps:
the method comprises the following steps: as shown in fig. 3, constructing a plurality of tunnel bottom deep hole displacement monitoring systems at intervals along the tunneling direction of a tunnel, wherein constructing one monitoring system comprises constructing a plurality of deep holes 4 at the same mileage position of the tunnel, the number of the deep holes 4 at the same mileage is 3-5, at least one deep hole 4 is positioned at the left lower part of a tunnel main hole 1, at least one deep hole 4 is positioned at the right lower part of the tunnel main hole 1, at least one deep hole 4 is positioned under the tunnel main hole 1, and the depth of each deep hole 4 is 20-30 m; and a deformation monitoring device is arranged in each deep hole 4, and the deformation monitoring device comprises a plurality of displacement meters 5 arranged along the depth direction.
Step two: and collecting accumulated deformation values of deformation monitoring devices (a plurality of displacement meters 5) at different mileage positions, and determining a construction scheme of the pressure relief pilot tunnel according to the accumulated deformation values.
Step three: and constructing a pressure relief pilot tunnel according to the construction scheme determined in the step two. Specifically, the accumulated deformation value refers to the accumulated deformation of a single displacement meter 5 in one deformation monitoring device, and the deformation limit value is that the accumulated deformation of the single displacement meter in the one deformation monitoring device is equal to 20 cm.
The utility model discloses embodiment 1 the structure be applicable to when being located tunnel positive hole 1 left side below or the condition that the accumulated deformation value that deep hole 4 of below right surveyed surpassed the deformation limit value, this moment longitudinal pressure release pilot hole 2's longitudinal length covers the region that the accumulated deformation value is greater than the deformation limit value at least, and longitudinal length is greater than or equal to 50 m.
The longitudinal pressure relief pilot tunnel 2 can be constructed by firstly digging through a transverse channel 3 between the longitudinal pressure relief pilot tunnel 2 and a tunnel main tunnel 1, wherein the gradient of the transverse channel 3 is not more than 10%, and then excavating the longitudinal pressure relief pilot tunnel 2.
Example 2
As shown in fig. 4, the present embodiment is different from embodiment 1 in that a pressure relief pilot hole capable of preventing deformation of a tunnel bottom includes longitudinal pressure relief pilot holes located at lower left and lower right of a tunnel main hole. The embodiment of the utility model provides a 2 the structure be applicable to when being located the tunnel positive hole 1 left side below and the condition that the accumulative deformation value that the deep hole 4 of the right below was surveyed all surpassed the deformation limit value.
The above embodiments are only used to illustrate the present invention and not to limit the technical solutions described in the present invention, and although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and therefore, any modification or equivalent replacement may be made to the present invention; all technical solutions and modifications without departing from the spirit and scope of the present invention should be covered by the claims of the present invention.
Claims (9)
1. The pressure relief pilot tunnel capable of preventing deformation of the bottom of the tunnel is characterized by comprising longitudinal pressure relief pilot tunnels positioned on the left lower side and/or the right lower side of a tunnel main tunnel, wherein the distance between each longitudinal pressure relief pilot tunnel and the central line of the tunnel main tunnel is 30-50 m, and a flexible supporting structure is arranged in each longitudinal pressure relief pilot tunnel.
2. The pressure relief pilot hole capable of preventing deformation of the bottom of a tunnel according to claim 1, wherein the flexible supporting structure comprises an anchor net jet lining.
3. The pressure relief pilot hole capable of preventing deformation of the bottom of the tunnel according to claim 1, wherein the flexible supporting structure comprises a full-ring four-limb grid steel frame.
4. The pressure relief pilot hole capable of preventing deformation of the bottom of a tunnel according to claim 1, wherein the flexible supporting structure comprises concrete sprayed on a full-circle four-limb grid steel frame.
5. The pressure relief pilot hole capable of preventing deformation of the bottom of a tunnel according to claim 4, wherein the concrete is steel fiber concrete.
6. The pressure relief pilot hole capable of preventing deformation of the bottom of a tunnel according to claim 1, wherein the top of the longitudinal pressure relief pilot hole is lower than the bottom of the tunnel main hole by within 10 m.
7. The pressure relief pilot hole capable of preventing deformation of the bottom of a tunnel according to any one of claims 1 to 6, wherein the longitudinal length of the longitudinal pressure relief pilot hole is greater than or equal to 50 m.
8. The pressure relief pilot hole capable of preventing deformation of the bottom of a tunnel according to claim 7, wherein the longitudinal length of the longitudinal pressure relief pilot hole is 50m-100 m.
9. The pressure relief pilot hole capable of preventing deformation of the bottom of a tunnel according to any one of claims 1 to 6, wherein the longitudinal pressure relief pilot hole has a width of 3m to 5m and a height of 3m to 5 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921302325.XU CN210264727U (en) | 2019-08-12 | 2019-08-12 | Pressure relief pilot tunnel capable of preventing deformation of tunnel bottom |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921302325.XU CN210264727U (en) | 2019-08-12 | 2019-08-12 | Pressure relief pilot tunnel capable of preventing deformation of tunnel bottom |
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| CN210264727U true CN210264727U (en) | 2020-04-07 |
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| CN201921302325.XU Active CN210264727U (en) | 2019-08-12 | 2019-08-12 | Pressure relief pilot tunnel capable of preventing deformation of tunnel bottom |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115560723A (en) * | 2022-12-07 | 2023-01-03 | 中国矿业大学(北京) | Advanced measurement method for instantaneous deformation of large-span tunnel surrounding rock |
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2019
- 2019-08-12 CN CN201921302325.XU patent/CN210264727U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115560723A (en) * | 2022-12-07 | 2023-01-03 | 中国矿业大学(北京) | Advanced measurement method for instantaneous deformation of large-span tunnel surrounding rock |
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