CN218030207U - Soft rock tunnel supporting construction - Google Patents
Soft rock tunnel supporting construction Download PDFInfo
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- CN218030207U CN218030207U CN202222142390.9U CN202222142390U CN218030207U CN 218030207 U CN218030207 U CN 218030207U CN 202222142390 U CN202222142390 U CN 202222142390U CN 218030207 U CN218030207 U CN 218030207U
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Abstract
The utility model relates to a tunnel engineering technical field discloses a soft rock tunnel supporting construction, include by outer toughness back up coat, the first flexible buffer layer that sets gradually to interior, let press a sheath, the flexible buffer layer of second and two linings. Let and press the supporting layer including letting the pressure equipment put and a plurality of continuous sections of jurisdiction, all set up between per two adjacent sections of jurisdiction and let the pressure equipment put. The toughness reinforcing layer can improve the strength of the soft rock tunnel surrounding rock and reduce the compressibility and permeability of the surrounding rock, thereby reducing the deformation of the surrounding rock. The first flexible buffer layer can reduce and let the strain of pressing a protective layer, compromise waterproof effect simultaneously, and the protection lets presses the device. Let the pressure equipment and can absorb and consume the hoop pressure between the section of jurisdiction, reduce and let the support resistance of pressing a protective layer, improve supporting construction's support stability. The second flexible buffer layer can reduce and let the influence that deformation that the pressure support layer produced to two linings produced, and its cushioning effect can further improve the wall rock deflection that the supporting construction can bear wholly simultaneously.
Description
Technical Field
The utility model relates to a tunnel engineering technical field especially relates to a soft rock tunnel supporting construction.
Background
The soft rock is an engineering rock body which can generate obvious deformation under the action of engineering force, the large-deformation area of the soft rock generally has the typical characteristics of high stress, large deformation, low strength and the like, and the large deformation of the soft rock often shows the obvious nonlinear large deformation characteristic, so that the support is difficult.
At present, in the construction engineering of the high ground stress weak rock tunnel, generally adopted supporting methods mainly comprise a passive supporting method, an active supporting method, a grouting soft rock modified supporting technology and the like. Although the supporting structure adopted by the supporting method can reduce large deformation generated by surrounding rocks, the supporting structure system is single, the deformation of the surrounding rocks is increased after the soft rock tunnel is excavated and unloaded in a high ground stress environment, the stress of the supporting structure is continuously increased, the displacement deformation is obvious, the supporting capability of the existing supporting structure is insufficient, and large deformation disasters easily occur in the tunnel.
Therefore, a soft rock tunnel supporting structure is needed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
Based on above problem, an object of the utility model is to provide a soft rock tunnel supporting construction can the stable supporting tunnel country rock, solves the not enough problem of strutting that leads to because of soft rock tunnel large deformation under the high ground stress environment.
In order to achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a soft rock tunnel supporting construction, include toughness anchor coat, first flexible buffer layer, let press a sheath, the flexible buffer layer of second and two linings, the toughness anchor coat first flexible buffer layer let press a sheath the flexible buffer layer of second with two linings are by outer to interior setting gradually, let press the support coat including let the pressure equipment put and a plurality of continuous section of jurisdiction, every adjacent two all be provided with between the section of jurisdiction let press the equipment put.
As the utility model discloses a soft rock tunnel supporting construction's preferred scheme, the toughness back up coat adopts the polymer to form to the surrounding rock slip casting in soft rock tunnel.
As the utility model discloses a soft rock tunnel supporting construction's preferred scheme, the toughness back up coat includes a plurality of anchor skeletons, the anchor skeleton by fill in high polymer in the skeleton crack of country rock forms.
As the utility model discloses a soft rock tunnel supporting construction's preferred scheme, let press the device including let the clamping ring and cross arrangement in let intra-annular first support piece of clamping ring and second support piece, let the clamping ring press from both sides and locate adjacent two between the link of section of jurisdiction.
As the utility model discloses a soft rock tunnel supporting construction's preferred scheme, let the pressure equipment and prepare by the steel material and form.
As the utility model discloses a soft rock tunnel supporting construction's preferred scheme, the section of jurisdiction is prefabricated reinforced concrete section of jurisdiction.
As the utility model discloses a soft rock tunnel supporting construction's preferred scheme, first flexible buffer layer adopt the high polymer spraying in form on the toughness back up coat, and can with let the pressure supporting layer closely laminate.
As the utility model discloses a soft rock tunnel supporting construction's preferred scheme, the flexible buffer layer of second adopt the high polymer spraying in let press and form on the supporting layer, and can with two linings closely laminate.
As the utility model discloses a soft rock tunnel supporting construction's preferred scheme, first flexible buffer layer with the thickness of the flexible buffer layer of second is 10cm.
As the utility model discloses a soft rock tunnel supporting construction's preferred scheme, two linings are cast-in-place reinforced concrete structure, the thickness on two linings is 45cm.
The beneficial effects of the utility model are that:
the utility model provides a soft rock tunnel supporting construction, the toughness back up coat can improve the intensity of soft rock tunnel country rock, reduces the compressibility and the permeability of country rock to improve the physical and mechanical properties and the dynamic characteristic of soft rock tunnel country rock, reduce the deflection of country rock. Through setting up first flexible buffer layer between toughness back up coat and let and press a protective layer, can utilize the cushioning effect and the power consumption effect of first flexible buffer layer to reduce and let and press a strain of protective layer, waterproof effect can be compromise to first flexible buffer layer simultaneously, and the protection lets the pressure device. The yielding device between every two adjacent pipe pieces can absorb and consume the circumferential pressure between the pipe pieces, the supporting resistance of the yielding supporting layer is reduced, and the supporting stability of the supporting structure is improved. Through let press to set up the flexible buffer layer of second between a protective layer and two linings, can reduce to let press the shrink that the layer produced or expand the influence that deformation produced to two linings, the flexible buffer layer of second can play waterproof effect simultaneously, and the protection lets the pressure device. In addition, the buffering effect and the energy consumption effect of the second flexible buffer layer can further improve the deformation of the surrounding rock which can be borne by the supporting structure, so that the supporting structure can be well suitable for the construction of high-ground-stress soft rock large-deformation tunnels.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of a soft rock tunnel supporting structure provided in an embodiment of the present invention;
fig. 2 is a schematic structural view of a yielding device of a soft rock tunnel supporting structure according to an embodiment of the present invention;
fig. 3 is a schematic view of the connection between the pressure-yielding device and the duct piece according to the embodiment of the present invention.
In the figure:
1-a ductile reinforcement layer; 2-a first flexible buffer layer; 3-yielding the supporting layer; 4-a second flexible buffer layer; 5-two lining layers;
11-an anchoring framework;
31-a pressure-yielding device; 32-a tube sheet;
311-letting the press ring; 312-a first support; 313-a second support;
100-surrounding rock.
Detailed Description
In order to make the technical problems, the adopted technical solutions and the achieved technical effects of the present invention clearer, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, a fixed connection or a detachable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present embodiment provides a soft rock tunnel supporting structure, which may be applied to soft rock tunnel construction in a high ground stress region. The soft rock tunnel supporting structure comprises a toughness reinforcing layer 1, a first flexible buffer layer 2, a yielding supporting layer 3, a second flexible buffer layer 4 and two lining layers 5.
Wherein, toughness back up coat 1, first flexible buffer layer 2, let press a protective layer 3, second flexible buffer layer 4 and two linings 5 and set gradually from outer to inner, and toughness back up coat 1 is the one deck that is closest to country rock 100 promptly, and two linings 5 are the one deck that is closest to the tunnel. Let and press a sheath 3 including letting press device 31 and a plurality of continuous section of jurisdiction 32, all be provided with between every two adjacent section of jurisdiction 32 and let press device 31.
According to the soft rock tunnel supporting structure provided by the embodiment, the toughness reinforcing layer 1 can improve the strength of the soft rock tunnel surrounding rock 100 and reduce the compressibility and permeability of the surrounding rock 100, so that the physical and mechanical properties and the dynamic characteristics of the soft rock tunnel surrounding rock 100 are improved, and the deformation of the surrounding rock 100 is reduced. Through setting up first flexible buffer layer 2 between toughness back up coat 1 and let press a protective layer 3, can utilize the cushioning effect and the power consumption effect of first flexible buffer layer 2 to reduce and let press a protective layer 3 strain, waterproof effect can be compromise simultaneously to first flexible buffer layer 2, and the protection lets press device 31. The yielding device 31 between every two adjacent pipe pieces 32 can absorb and consume the circumferential pressure between the pipe pieces 32, so that the supporting resistance of the yielding supporting layer 3 is reduced, and the supporting stability of the supporting structure is improved. Through let press a protective layer 3 and two lining 5 between set up second flexible buffer layer 4, can reduce to let press the shrink that a protective layer 3 produced or expand the influence that warp two lining 5 produced, second flexible buffer layer 4 can play waterproof effect simultaneously, and the protection lets pressure device 31. In addition, the buffering effect and the energy consumption effect of the second flexible buffer layer 4 can further improve the deformation of the surrounding rock 100 which can be borne by the whole supporting structure, so that the supporting structure can be well suitable for the construction of high-ground-stress soft rock large-deformation tunnels.
Alternatively, the ductile reinforcing layer 1 is formed by grouting high polymer into the surrounding rock 100 of the soft rock tunnel. In this embodiment, referring to fig. 1, the flexible reinforced layer 1 includes a plurality of anchoring frameworks 11, and the anchoring frameworks 11 are formed by high polymers filled in the framework cracks of the surrounding rock 100. During specific construction, firstly, high polymer is injected into the surrounding rock 100 of the soft rock tunnel at a high pressure, when the pressure of the high polymer slurry is greater than the shearing strength of the surrounding rock 100, a soil body on a weak surface is damaged to generate splitting, the high polymer slurry continuously moves forwards along a fracture surface, the high polymer slurry is continuously extruded while the splitting is performed, and criss-cross framework fractures formed on the surrounding rock 100 are filled with the high polymer, so that the toughness reinforcing layer 1 is formed. By injecting high polymer slurry into the surrounding rock 100 to form the anchoring framework 11, the compactness of the surrounding rock 100 of the tunnel is increased, the physical mechanical property and the dynamic property of the surrounding rock 100 are improved, the strength of the surrounding rock 100 is improved, and the deformation of the surrounding rock 100 can be reduced.
Optionally, referring to fig. 2 and fig. 3, the yielding device 31 includes a yielding ring 311, and a first supporting member 312 and a second supporting member 313 that are arranged in the yielding ring 311 in an intersecting manner, where the yielding ring 311 is sandwiched between the connecting ends of two adjacent segments 32. The pressure-letting ring 311 is used for bearing the circumferential pressure between two adjacent segments 32, and the first support 312 and the second support 313 are used for supporting the pressure-letting ring 311 to avoid deformation of the pressure-letting ring 311. In this embodiment, the pressure-yielding device 31 is made of a steel material, that is, the pressure ring 311, the first support 312 and the second support 313 are all made of a steel material, and the steel material is preferably Q235B grade steel. Yielding device 31 can produce elastic-plastic deformation when bearing the hoop pressure of section of jurisdiction 32 to absorb and consume hoop pressure, because hoop pressure makes the bucking that yielding device 31 produced unanimous with the internal force characteristics that yielding support layer 3 received, consequently yielding support layer 3 can reduce certain supporting resistance through yielding device 31, can shorten the girth that yields support layer 3 through yielding device 31 simultaneously again and adjust the stress of country rock 100, thereby improve supporting construction's support stability.
Referring to fig. 1, in the embodiment, the yielding device 31 is disposed at a position where the bending stress of the yielding support layer 3 is small, and the yielding device 31 has strong shear resistance and bearing capacity, that is, the yielding device 31 has the characteristic of "strong shear and weak pressure", so that the yielding support layer 3 formed by combining the duct piece 32 and the yielding device 31 has the mechanical characteristics of rigid-flexible-rigid, and can be adapted to the large deformation characteristic of the high ground stress soft rock.
Alternatively, referring to fig. 2 and fig. 3, the contact surface of the pressing ring 311 and the segment 32 is made flat, so that the pressing ring 311 is connected to the segment 32, and the connection strength between the pressing ring 311 and the segment 32 is ensured. In this embodiment, the duct piece 32 is a prefabricated reinforced concrete duct piece. An embedded part is arranged in the duct piece 32, so that the pressure ring 311 can be connected with the embedded part in a welding manner, and the connection between the duct piece 32 and the pressure yielding device 31 is realized. Preferably, the thickness of the tube sheet 32 is 25cm, i.e. the overall thickness of the back-up layer 3 is 25cm.
Alternatively, referring to fig. 1, the first flexible buffer layer 2 is formed by spraying a high polymer on the flexible reinforcing layer 1 and can be closely attached to the crush support layer 3. After the construction of the toughness reinforcing layer 1 is completed, the high polymer is firstly coated on the outer side of the toughness reinforcing layer 1 for sealing, then spraying equipment is debugged to start spraying the hard bubble high polymer, so that a first flexible buffer layer 2 is formed, and the buffering effect and the energy consumption effect of the first flexible buffer layer 2 can reduce the strain of the yielding support protective layer 3. Let and press a section of jurisdiction 32 of protective layer 3 and let and press device 31 sealed the laminating in the first flexible buffer layer 2 outside to make first flexible buffer layer 2 form and let and press a waterproof layer of protective layer 3, avoid letting to press device 31 corrosion damage.
Alternatively, referring to fig. 1, the second flexible buffer layer 4 is formed by spraying a high polymer on the yielding support layer 3 and can be closely attached to the two liners 5. After the yielding support layer 3 is constructed, spraying high polymers on the outer side of the yielding support layer 3 by adopting spraying equipment, so that a second flexible buffer layer 4 is formed, and the second flexible buffer layer 4 can further release the stress and deformation of the yielding support layer 3 so as to improve the deformation of the surrounding rock 100, which can be borne by the whole support structure. Meanwhile, the second flexible buffer layer 4 can play a waterproof role in the yielding support layer 3 from the other side, and the yielding device 31 is prevented from being corroded and damaged.
Optionally, the thickness of each of the first flexible buffer layer 2 and the second flexible buffer layer 4 of the present embodiment is 10cm. The size design can ensure that the two have enough buffering capacity and can also ensure the waterproof capacity of the two.
Optionally, the two lining layers 5 are of a cast-in-place reinforced concrete structure, and the thickness of the two lining layers 5 is 45cm. After the second flexible buffer layer 4 is constructed and the deformation of the surrounding rock 100 is stable, the second lining layer 5 is formed in the tunnel through cast-in-place concrete.
The soft rock tunnel supporting structure provided by the embodiment has the following construction steps:
firstly, injecting high polymer into the surrounding rock 100 of the soft rock tunnel at a high pressure, when the pressure of the high polymer slurry is greater than the shear strength of the surrounding rock 100, the soil body on the weak surface is damaged to generate cleavage, and the high polymer slurry continuously moves forwards along the fracture surface to form a slurry vein framework (namely, an anchoring framework 11) which is criss-cross, so that the toughness reinforcing layer 1 is formed.
Secondly, the surrounding rock base layer is inspected and processed, the water content of the surrounding rock base layer and the environment temperature and humidity are guaranteed, then the high polymer sealing base layer is coated, spraying equipment is debugged to conduct trial spraying, and after the operation is completed, the hard bubble high polymer can be formally sprayed on the surrounding rock base layer, so that a first flexible buffer layer 2 with the thickness of 10cm is formed.
Then, the construction yields the pressure to prop up the sheath 3, installs the prefabricated section of jurisdiction 32 of reinforced concrete to reserve and yield the pressure device 31 interface, will yield and press device 31 and be connected with section of jurisdiction 32, form and yield and press to prop up sheath 3. The spraying device is then activated again to spray on the outside of the let down support layer 3 to form a second flexible buffer layer 4 of 10cm thickness.
And finally, after the construction of the second flexible buffer layer 4 is finished and the surrounding rock 100 is deformed and stabilized, supporting a template in the tunnel, and casting concrete in situ to form a second lining layer 5.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. The utility model provides a soft rock tunnel supporting construction, its characterized in that includes toughness back up coat (1), first flexible buffer layer (2), lets press a sheath (3), second flexible buffer layer (4) and two linings (5), toughness back up coat (1) first flexible buffer layer (2) let press a sheath (3), second flexible buffer layer (4) with two linings (5) are by outer to interior setting gradually, let press a sheath (3) including letting press device (31) and a plurality of continuous section of jurisdiction (32), every adjacent two all be provided with between section of jurisdiction (32) let press device (31).
2. Soft rock tunnel support structure according to claim 1, characterised in that the tough reinforcement layer (1) is formed by grouting high polymer into the surrounding rock (100) of the soft rock tunnel.
3. Soft rock tunnel support structure according to claim 2, characterised in that the tough reinforcement layer (1) comprises a plurality of anchoring skeletons (11), the anchoring skeletons (11) being formed of high polymers filled in the skeleton fissures of the surrounding rock (100).
4. The soft rock tunnel supporting structure according to claim 1, wherein the yielding device (31) comprises a yielding ring (311) and a first supporting piece (312) and a second supporting piece (313) which are arranged in the yielding ring (311) in a crossed manner, and the yielding ring (311) is clamped between the connecting ends of two adjacent segments (32).
5. Soft rock tunnel support structure according to claim 4, characterised in that the pressure-yielding device (31) is made of steel material.
6. Soft rock tunnel support structure according to any one of claims 1-5, characterised in that the tube sheet (32) is a prefabricated reinforced concrete tube sheet.
7. The soft rock tunnel supporting structure according to any one of claims 1 to 5, wherein the first flexible buffer layer (2) is formed by spraying a high polymer on the tough reinforcing layer (1) and can be tightly attached to the yielding supporting layer (3).
8. The soft rock tunnel supporting structure according to any one of claims 1 to 5, wherein the second flexible buffer layer (4) is formed by spraying a high polymer on the yielding support layer (3) and can be closely attached to the two lining layers (5).
9. Soft rock tunnel support structure according to any one of claims 1-5, characterised in that the first (2) and the second (4) flexible buffer layers are each 10cm thick.
10. Soft rock tunnel support structure according to any one of claims 1-5, characterised in that the two linings (5) are cast-in-place reinforced concrete structures and the thickness of the two linings (5) is 45cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222142390.9U CN218030207U (en) | 2022-08-15 | 2022-08-15 | Soft rock tunnel supporting construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222142390.9U CN218030207U (en) | 2022-08-15 | 2022-08-15 | Soft rock tunnel supporting construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218030207U true CN218030207U (en) | 2022-12-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222142390.9U Active CN218030207U (en) | 2022-08-15 | 2022-08-15 | Soft rock tunnel supporting construction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218030207U (en) |
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2022
- 2022-08-15 CN CN202222142390.9U patent/CN218030207U/en active Active
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