CN212003214U - Open-face tunnel lining structure passing through giant karst cave - Google Patents
Open-face tunnel lining structure passing through giant karst cave Download PDFInfo
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- CN212003214U CN212003214U CN202020607558.7U CN202020607558U CN212003214U CN 212003214 U CN212003214 U CN 212003214U CN 202020607558 U CN202020607558 U CN 202020607558U CN 212003214 U CN212003214 U CN 212003214U
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Abstract
The utility model discloses a tunnel obviously does lining cutting structure that passes through huge solution cavity, including locating secondary lining and the backfill layer in the solution cavity hall, all be equipped with the buffer layer between secondary lining's hunch portion, left side wall and right side wall and the backfill layer, the buffer layer is compressible component, and the backfill layer is light filling member, and the secondary lining bottom is equipped with at least one tunnel basement and reserves the slip casting hole. By applying the utility model, the secondary lining structure has a certain degree of freedom, when the secondary lining bottom plate is unevenly settled, the secondary lining and the backfill layer can relatively independently displace, the secondary lining structure can be ensured not to be cracked and damaged by the settlement or extrusion of the backfill layer, and the deformation limit of backfill stones around the traditional lining structure to the lining structure is eliminated; and meanwhile, the tunnel base is provided with a tunnel base reserved grouting hole, and once lining settlement exceeds a limit value, compensation grouting is carried out through the tunnel base reserved grouting hole, so that the stability and the operation safety of the tunnel structure are ensured.
Description
Technical Field
The utility model relates to a tunnel construction field especially relates to a tunnel of passing through huge solution cavity is made lining cutting structure and construction method thereof.
Background
After twenty-first century, railway construction in China is developed at a high speed, and with further radiation to southwest areas of railway construction in China, the occupation ratio of corresponding railway tunnels in the total length of lines is higher and higher. In the cloud and precious areas of China, carbonate distribution with a very wide range exists, and a large number of mountain tunnels built or built inevitably pass through karst areas.
When the tunnel passes through a strong development area of the karst cave, as the hydrogeological condition and the engineering geological condition are more complex, more geological defect bodies bring great influence on the construction of the tunnel. Most of the research at present only starts from the aspect of processing the karst cave, and the research on the design of the engineering main body tunnel supporting structure is ignored. And from the tunnel that passes through the karst cave that builds, tunnel post-construction settlement is difficult to control, especially when the tunnel structure appears uneven settlement, and is very big to the safety impact during the operation of railway tunnel. When the complex geological conditions of the huge karst cave are met, if the complex geological conditions are not properly treated, the construction progress is hindered, the construction period is delayed, the cost is increased, and the operation safety of the tunnel is seriously threatened. Therefore, when the tunnel passes through a huge karst cave hall, in order to ensure the construction safety and the safety of the tunnel operation period, a reasonable lining structure and an excavation construction method are required.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: when the tunnel to prior art existence passes through huge karst cave hall, if handle improperly, not only hinder the construction progress, lead to time limit for a project delay and expense to increase, still cause serious threat for tunnel operation safety, consequently, the utility model provides a tunnel that passes through huge karst cave obviously makes lining cutting structure and construction method thereof can effectively solve the problem that the large cross section tunnel lining cutting structure that passes through huge karst cave hall leads to the lining cutting because of the basis produces differential settlement to ensure tunnel structure stability and operation safety.
In order to realize the purpose, the utility model discloses a technical scheme be:
the tunnel open-face lining structure passing through the giant karst cave comprises a secondary lining and a backfill layer which are arranged in a karst cave hall, buffer layers are arranged among an arch part, a left side wall and a right side wall of the secondary lining and the backfill layer, the buffer layers are compressible members, the backfill layer is a light filling member, and at least one tunnel base reserved grouting hole is formed in the bottom of the secondary lining.
The tunnel through the giant solution cavity is adopted as the lining structure, the buffer layer is arranged between the secondary lining and the backfill layer, so that the secondary lining structure has certain degree of freedom, when the secondary lining bottom plate is unevenly settled, the secondary lining and the backfill layer can relatively independently displace, the secondary lining structure can be ensured not to be cracked and damaged by settlement or extrusion of the backfill layer, and the deformation limit of backfill soil stones at the periphery of the traditional lining structure to the lining structure is eliminated; meanwhile, the tunnel base is provided with a tunnel base reserved grouting hole, once lining settlement exceeds a limit value, compensation grouting can be performed through the tunnel base reserved grouting hole, and therefore stability and operation safety of a tunnel structure are guaranteed.
Preferably, the buffer layer is a foam sheet.
Preferably, the thickness of the buffer layer is 20cm-40 cm.
Preferably, a waterproof and drainage system is arranged between the buffer layer and the secondary lining.
Preferably, the backfill layer is a foam concrete backfill body.
Preferably, a cave top rock body reinforcing structure is arranged at the top of the karst cave above the secondary lining.
Preferably, the secondary lining further comprises a bottom plate, a bridge beam plate is arranged in the secondary lining, and a deformation space is reserved on the inner side of the secondary lining.
Further preferably, the base plate is located on a stable foundation.
The utility model also provides a construction method of passing through tunnel obviously making lining structure of huge karst cave as in any one above, including following step:
firstly, backfilling a karst cave hall in layers to a platform position 5m.10m away from the top of the karst cave;
constructing a top rock body reinforcing structure at the top of the karst cave;
slope excavation is carried out in the open cut tunnel construction range, and the left slope surface and the right slope surface are respectively protected by a left side slope reinforcing structure and a right side slope reinforcing structure;
fourthly, setting a foundation reinforcing structure on the open cut tunnel base;
constructing a bottom plate of a secondary lining on the open cut tunnel base, and arranging a reserved grouting hole on the tunnel base;
sixthly, sequentially constructing a left side wall, a right side wall and an arch part of the secondary lining from bottom to top;
seventh, constructing a water-proof and drainage system on the outer side of the secondary lining;
eighthly, paving a buffer layer outside the waterproof and drainage system;
and ninthly, backfilling the karst cave hall outside the secondary lining layer in a layered manner to form a backfill layer.
Preferably, in the step I, the karst cave hall is backfilled layer by adopting the tunnel waste slag.
Preferably, in the second step, the roof rock reinforcing structure is an anchor net-jet support.
Preferably, in the third step, the open cut tunnel is set to slope at a certain slope rate within the construction range of the open cut tunnel, and the abandoned slag body is excavated.
Preferably, in the third step, the left side slope reinforcing structure is an anchor net shotcrete support.
Preferably, in the third step, the right side slope reinforcement structure is an anchor net shotcrete support.
Preferably, in the step (iv), the foundation reinforcing structure includes a grouting reinforcing structure, a steel pipe pile grouting reinforcing structure, or a jet grouting pile reinforcing structure.
Preferably, in the step (viii), the cushion layer is a foam sheet.
Preferably, in the step ninthly, the backfill layer is a foam concrete backfill body.
Preferably, the first step to the ninth step are repeated until the full-length excavation of the design section in the karst cave hall is completed, and then the secondary lining middle bridge beam slab is constructed.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the utility model relates to a tunnel that passes through huge solution cavity obviously does lining cutting structure and construction method thereof, set up the buffer layer between secondary lining cutting and the backfill layer, make the secondary lining cutting structure have certain degree of freedom, when the secondary lining cutting bottom plate department takes place differential settlement, the secondary lining cutting with the backfill layer can relatively independent displacement, can guarantee the secondary lining cutting structure can not receive the settlement or the extrusion of backfill layer to break apart the destruction, eliminated the deformation restriction of traditional lining cutting structure peripheral backfill stone to the lining cutting structure, thereby ensure tunnel structure's stability;
2. the utility model relates to a tunnel obviously making lining structure passing through a giant karst cave and a construction method thereof, a bridge beam plate is arranged in an inner space by a secondary lining structure, so that the risk of falling blocks and slumping which are easy to occur on the wall of a karst cave hall and the shallow layer of the top of the cave is avoided during the line operation;
3. the utility model discloses a tunnel obviously do lining cutting structure and construction method that passes through huge karst cave, reserve deformation space in the secondary lining cutting structure, guaranteed when the bottom plate takes place inhomogeneous settlement, secondary lining cutting structure even take place certain deformation and will not influence the security of bridge beam slab and driving a vehicle yet;
4. a tunnel that passes through huge solution cavity is made clear lining structure and construction method thereof, set up at the tunnel basement the slip casting hole is reserved to the tunnel basement, in case the lining subsides and surpasss the limit value, the accessible the slip casting hole is reserved to the tunnel basement and the slip casting is compensated, has avoided too big settlement to lead to interior headroom limit not enough problem.
5. The tunnel open-face lining structure passing through the giant cavern and the construction method thereof adopt the tunnel waste slag to backfill the giant cavern hall, solve the problem of no construction operation platform, fully improve the utilization rate of waste slag and waste material, and avoid the environmental protection problem caused by the tunnel waste slag; construction method is reasonable safe, has effectively promoted the efficiency of construction, has carried through the requirement of "green construction".
Drawings
FIG. 1 is a schematic view of an open lining structure of a tunnel passing through a giant cavern according to the present invention;
FIG. 2 is an enlarged schematic view of A of FIG. 1;
FIG. 3 is a schematic diagram of step (r) in example 2;
FIG. 4 is a schematic view of step (C) in example 2;
FIG. 5 is a schematic view of step (c) and step (d) in example 2;
FIG. 6 is a schematic view showing the steps (c) to (viii) of example 2;
FIG. 7 is a schematic diagram of the step ninthly in example 2.
Icon: 1-secondary lining, 11-arch part, 12-left side wall, 13-right side wall, 14-bottom plate, 2-buffer layer, 3-backfill layer, 4-bridge beam plate, 5-waterproof and drainage system, 6-karst cave hall, 7-platform position, 81-cave top rock mass reinforcing structure, 82-left side slope reinforcing structure, 83-right side slope reinforcing structure, 84-foundation reinforcing structure and 9-reserved grouting holes in the tunnel base.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1
As shown in fig. 1-7, the open lining structure of tunnel passing through huge karst cave of the present invention includes a secondary lining 1 and a backfill layer 3 arranged in a karst cave hall 6.
The arch part 11, the left side wall 12, the right side wall 13 and the backfill layer 3 are all provided with buffer layers 2, the buffer layers 2 are compressible members, the backfill layer 3 is a light filling member, and tunnel base reserved grouting holes 9 are symmetrically arranged on two sides of the bottom plate 14. Specifically, the buffer layer 2 is a foam plate, the thickness of the buffer layer 2 is 20cm-40cm, and a waterproof and drainage system 5 is arranged between the buffer layer 2 and the secondary lining 1; the backfill layer 3 is a foam concrete backfill body.
And a bridge beam plate 4 is arranged in the secondary lining 1, and a 100cm deformation space is reserved on the inner side of the secondary lining 1.
The application of the open-cut lining structure of the tunnel passing through the giant karst cave, the buffer layer 2 is arranged between the secondary lining 1 and the backfill layer 3, the buffer layer 2 is a compressible component, so that the structure of the secondary lining 1 has certain freedom, when the secondary lining bottom plate 14 is subjected to uneven settlement, the secondary lining 1 and the backfill layer 3 can relatively and independently displace, the structure of the secondary lining 1 can be ensured not to be subjected to settlement or extrusion of the backfill layer 3 to crack and damage, and the deformation limit of backfill soil stones around the traditional lining structure to the lining structure is eliminated; meanwhile, the tunnel base is provided with the reserved grouting holes 9, once lining settlement exceeds a limit value, compensation grouting can be performed through the reserved grouting holes 9 of the tunnel base, and therefore stability and operation safety of a tunnel structure are guaranteed; the secondary lining 1 structure arranges the bridge beam plate 4 in the inner space, so that the risk of block falling and collapse easily occurring on the cave wall and the shallow layer of the cave top of the karst cave hall 6 is avoided during the line operation; a deformation space is reserved in the secondary lining 1 structure, so that when the bottom plate 14 is unevenly settled, the safety of the bridge beam plate 4 and the driving is not influenced even if the secondary lining 1 structure is deformed to a certain extent.
Example 2
As shown in fig. 1-7, the construction method of the open lining structure of the tunnel passing through the giant cavern according to the embodiment of the present invention includes the following steps:
firstly, as shown in fig. 3, a karst cave hall 6 is backfilled in layers by adopting tunnel waste slag, and the backfilling is carried out to a platform position 7 which is 5-10 m away from the top of the karst cave;
secondly, as shown in FIG. 4, constructing an anchor net at the top of the karst cave to spray a cave top rock body reinforcing structure 81;
thirdly, as shown in fig. 5, the open cut tunnel is set up to slope according to a certain slope rate within the construction range, the left slope surface and the right slope surface are protected by an anchor net spraying left side slope reinforcing structure 82 and an anchor net spraying right side slope reinforcing structure 83 respectively;
fourthly, as shown in fig. 5, arranging a foundation reinforcing structure 84 on the open cut tunnel base, wherein the foundation reinforcing structure 84 comprises a grouting reinforcing structure, a steel pipe pile grouting reinforcing structure or a jet grouting pile reinforcing structure;
constructing a bottom plate 14 of the secondary lining 1 on the open cut tunnel base and arranging a reserved grouting hole 9 of the tunnel base as shown in figure 6;
sixthly, as shown in fig. 6, the left side wall 12, the right side wall 13 and the arch part 11 of the secondary lining 1 are sequentially constructed from bottom to top;
seventhly, as shown in figures 2 and 6, constructing a water preventing and draining system 5 on the outer side of the secondary lining 1;
eighthly, as shown in fig. 6, paving a buffer layer 2 outside the waterproof and drainage system 5, wherein the buffer layer 2 is a polystyrene foam board with the thickness of 30 cm;
ninthly, as shown in figure 7, backfilling the karst cave hall 6 at the outer side of the secondary lining 1 by layers by adopting foam concrete to form a backfill layer 3.
And repeating the first step to the ninth step until the full-length excavation of the design section in the karst cave hall 6 is completed, and then constructing the bridge beam slab 4 in the secondary lining 1.
The utility model discloses an application a pass through tunnel obviously do lining cutting structure's construction method of huge solution cavity, secondary lining 1 with set up between backfill layer 3 buffer layer 2, buffer layer 2 is the compressible component, makes secondary lining 1 structure have certain degree of freedom, when secondary lining bottom plate 14 department takes place differential settlement, secondary lining 1 with backfill layer 3 can relative independent displacement, can guarantee secondary lining 1 structure can not receive the settlement or the extrusion of backfill layer 3 to take place to split the destruction, has eliminated the deformation restriction of traditional lining cutting structure peripheral backfill stone to lining cutting structure; meanwhile, the tunnel base is provided with the reserved grouting holes 9, once lining settlement exceeds a limit value, compensation grouting can be performed through the reserved grouting holes 9 of the tunnel base, and therefore stability and operation safety of a tunnel structure are guaranteed; the secondary lining 1 structure arranges the bridge beam plate 4 in the inner space, so that the risk of block falling and collapse easily occurring on the cave wall and the shallow layer of the cave top of the karst cave hall 6 is avoided during the line operation; a deformation space is reserved in the structure of the secondary lining 1, so that when the bottom plate 14 is unevenly settled, the safety of a bridge beam plate 4 and driving cannot be influenced even if the structure of the secondary lining 1 deforms to a certain extent; the tunnel waste slag is adopted to backfill the huge karst cave hall 6, so that the problem of no construction operation platform is solved, the utilization rate of waste slag is fully improved, and the environmental protection problem caused by tunnel waste slag is avoided; construction method is reasonable safe, has effectively promoted the efficiency of construction, has carried through the requirement of "green construction".
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The open-face tunnel lining structure passing through the huge karst cave is characterized by comprising a secondary lining (1) and a backfill layer (3) which are arranged in a karst cave hall (6), wherein buffer layers (2) are arranged among an arch part (11), a left side wall (12) and a right side wall (13) of the secondary lining (1) and the backfill layer (3), the buffer layers (2) are compressible members, the backfill layer (3) is a light filling member, and at least one tunnel base reserved grouting hole (9) is formed in the bottom of the secondary lining (1).
2. The open lining structure of a tunnel traversing a giant cavern according to claim 1, wherein the buffer layer (2) is a foam board.
3. The open lining structure of a tunnel traversing a giant cavern according to claim 1, wherein the thickness of the buffer layer (2) is 20cm to 40 cm.
4. The open lining structure of a tunnel passing through a giant cavern according to claim 1, wherein a waterproof and drainage system (5) is arranged between the buffer layer (2) and the secondary lining (1).
5. The open lining structure of a tunnel passing through a giant cavern according to claim 1, wherein the backfill layer (3) is a foam concrete backfill.
6. The open-face tunnel lining structure for giant cavern crossing according to claim 1, wherein a cavern top part above the secondary lining (1) is provided with a cavern top rock mass reinforcing structure (81).
7. The open lining structure of a tunnel passing through a giant cavern according to any one of claims 1 to 6, wherein the secondary lining (1) further comprises a bottom plate (14), the secondary lining (1) is used for arranging bridge beam plates (4), and deformation space is reserved inside the secondary lining (1).
8. A tunnel open lining structure for crossing giant caverns as claimed in claim 7, wherein said floor (14) is located on a stable foundation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020607558.7U CN212003214U (en) | 2020-04-21 | 2020-04-21 | Open-face tunnel lining structure passing through giant karst cave |
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| CN202020607558.7U CN212003214U (en) | 2020-04-21 | 2020-04-21 | Open-face tunnel lining structure passing through giant karst cave |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396089A (en) * | 2020-04-21 | 2020-07-10 | 中铁二院工程集团有限责任公司 | Open-cut tunnel lining structure passing through giant karst cave and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396089A (en) * | 2020-04-21 | 2020-07-10 | 中铁二院工程集团有限责任公司 | Open-cut tunnel lining structure passing through giant karst cave and construction method thereof |
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