Red layer gypsum rock stratum tunnel anti-erosion and aging deformation supporting structure and construction method

Abstract

The invention discloses a red-layer gypsum rock stratum tunnel anti-erosion and aging deformation supporting structure which comprises an anti-erosion primary supporting layer, a buffering energy absorption layer, a corrugated waterproof isolation layer and a secondary lining layer. The anti-erosion primary support layer is tightly attached to the inner wall of the tunnel in the circumferential direction of the inner wall of the tunnel; the buffer energy absorption layer is arranged on the inner side of the anti-erosion primary support layer; the corrugated waterproof isolation layer is arranged between the anti-erosion primary support layer and the buffer energy absorption layer; the secondary lining layer is arranged on the inner side of the buffering energy absorption layer. The invention further discloses a construction method of the red gypsum rock stratum tunnel anti-erosion and aging deformation supporting structure. Compared with the prior art, the red layer gypsum rock stratum tunnel anti-erosion and aging deformation supporting structure has the advantages that the anti-erosion performance of a tunnel structure is enhanced, tunnel aging deformation is controlled, and tunnel bottom heaving is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel support, in particular to a red layer gypseous stratum tunnel anti-erosion and aging deformation support structure and construction method. BACKGROUND

[0002] Due to the gradual advancement of tunnel engineering construction to the complex and dangerous mountainous areas in the western plateau, the geological conditions related thereto are more complex, especially in the gypseous stratum with strong rheological property, dissolution and corrosion, the tunnel passing through the gypseous stratum is prone to lining cracking, inverted arch uplift, and support stress damage caused by hydration expansion and aging deformation, concrete structure corrosion and degradation and other diseases. Therefore, combined with the complex geological conditions in the western plateau region, it is the key to the safe construction and long-term safe operation of the tunnel in the complex geological conditions of the plateau mountainous area to overcome the problems of poor durability and short service life of the tunnel support passing through the gypseous stratum.

[0003] The existing tunnel support structure cannot balance the long-term stability and durability of the structure, and it is urgent to develop a new support method to solve the problem of long-term safe service of the gypseous stratum tunnel.

[0004] Therefore, how to provide a red layer gypseous stratum tunnel anti-erosion and aging deformation support structure to achieve the technical effect of strengthening the anti-erosion performance of the tunnel structure, controlling the aging deformation and bottom heave of the tunnel is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0005] In view of the problems of structure corrosion, aging deformation, bottom heave and the like occurring in the tunnel support process in the prior art, the technical problem to be solved by the present application is to provide a red layer gypseous stratum tunnel anti-erosion and aging deformation support structure to achieve the technical effect of strengthening the anti-erosion performance of the tunnel structure, controlling the aging deformation and bottom heave of the tunnel, which is a technical problem that needs to be solved by those skilled in the art.

[0006] To achieve the above object, the application provides a tunnel supporting structure for resisting erosion and time-dependent deformation in red-bed gypsolite stratum, which comprises an initial erosion-resistant supporting layer, which is arranged along the circumferential direction of the inner wall of the tunnel and closely adheres to the inner wall of the tunnel; a buffer energy-absorbing layer, which is arranged inside the initial erosion-resistant supporting layer; a corrugated waterproof isolation layer, which is arranged between the initial erosion-resistant supporting layer and the buffer energy-absorbing layer; a secondary lining layer, which is arranged inside the buffer energy-absorbing layer; and n groups of anchor rods, which are uniformly and spacedly arranged along the inner wall of the initial erosion-resistant supporting layer, each group of the anchor rods comprising a plurality of grouting anchor rods, which are uniformly and spacedly arranged along the axial direction of the tunnel on the inner wall of the initial erosion-resistant supporting layer, and n being an integer not less than 5.

[0007] In the first aspect, one end of each grouting anchor rod is embedded in the inner wall of the initial erosion-resistant supporting layer, and the other end of each grouting anchor rod is embedded in the surrounding rock of the tunnel.

[0008] In the first aspect, the initial erosion-resistant supporting layer is an erosion-resistant sprayed ultra-high performance concrete structure, and a fiber mesh is arranged inside the erosion-resistant sprayed ultra-high performance concrete structure.

[0009] In the first aspect, the corrugated waterproof isolation layer comprises a plurality of W-shaped corrugated plates, which are adjacently arranged along the inner wall of the initial erosion-resistant supporting layer; the buffer energy-absorbing layer comprises a plurality of buffer energy-absorbing pipes, which are adjacently arranged along the inner wall of the corrugated waterproof isolation layer; and each buffer energy-absorbing pipe is made of polyurethane material or integrally formed by polyurethane material.

[0010] In the first aspect, the secondary lining layer is a cast concrete layer structure, and a steel mesh is arranged inside the cast concrete layer structure.

[0011] In the first aspect, the initial erosion-resistant supporting layer comprises an upper supporting part, which is located in the area above the bottom pavement of the tunnel, and (n-2) groups of the anchor rods are uniformly and spacedly arranged along the inner wall of the upper supporting part; and a bottom supporting part, which is located in the area below the bottom pavement of the tunnel, and two groups of the anchor rods are respectively arranged at the bottom supporting part close to the upper supporting part, and the two groups of the anchor rods are symmetrically arranged with the center line of the bottom pavement of the tunnel as the axis of symmetry.

[0012] In the first aspect, the W-shaped corrugated plate is integrally formed by stainless steel plate or galvanized steel plate.

[0013] In the first aspect, the grouting material of each of the grouting anchor rods is an aluminum sulfate salt type anti-erosion material.

[0014] The application further provides a construction method of the tunnel anti-erosion and time-dependent deformation supporting structure in the red-bed gypsolite stratum, which is constructed in the tunnel anti-erosion and time-dependent deformation supporting structure in the red-bed gypsolite stratum, and comprises the following steps: anti-erosion primary supporting layer construction: selecting anti-erosion sprayed ultra-high performance concrete as the sprayed concrete material of the anti-erosion primary supporting layer, laying a fiber mesh on the tunnel excavation surface, and then spraying the anti-erosion sprayed ultra-high performance concrete on the tunnel excavation surface by using a spraying device to obtain the anti-erosion primary supporting layer; anchor rod laying: laying grouting anchor rods on the inner wall of the anti-erosion primary supporting layer by using a drilling device, and grouting by using a sulphoaluminate grouting material; corrugated waterproof isolation layer laying: laying prefabricated W-shaped corrugated plates closely against the inner wall of the anti-erosion primary supporting layer, and ensuring that any two adjacent W-shaped corrugated plates are firmly connected to obtain the corrugated waterproof isolation layer; buffer energy absorption layer construction: installing prefabricated buffer energy absorption pipes closely against the inner wall of the corrugated waterproof isolation layer, and ensuring that any two adjacent buffer energy absorption pipes are firmly connected to obtain the buffer energy absorption layer; secondary lining layer construction: laying a steel mesh on the inner wall of the buffer energy absorption layer, and then pouring concrete to obtain the secondary lining layer.

[0015] In the second aspect, the long-term mechanical properties of the red-bed gypsolite stratum are analyzed in detail before the anti-erosion primary supporting layer construction, so that the anti-erosion and time-dependent deformation adaptability of the tunnel supporting structure is comprehensively understood.

[0016] Supporting effect: The application provides a tunnel supporting structure for resisting erosion and time-dependent deformation in red-bed gypsolite strata. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

[0018] Fig. 1 FIG. 1 is a schematic diagram of a tunnel supporting structure for resisting erosion and time-dependent deformation in red-bed gypsolite strata according to the present application; Fig. 2 FIG. 3 is a schematic diagram of a W-shaped corrugated plate according to the present application.

[0019] Reference signs: 1, primary support layer for resisting erosion; 11, upper support part; 12, bottom support part; 2, buffer and energy absorption layer; 3, corrugated waterproof isolation layer; 4, secondary lining layer; 5, grouting anchor rod; 6, bottom road surface; 7, surrounding rock. Detailed Implementation

[0020] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in this specification are within the scope of protection of this invention.

[0021] Example 1 like Figs. 1-2 As shown in the figure, this embodiment provides an anti-erosion and time-deformation support structure for tunnels in red bed gypsum rock strata. The anti-erosion and time-deformation support structure for tunnels in red bed gypsum rock strata includes: an anti-erosion initial support layer 1, which is set close to the inner wall of the tunnel along the circumferential direction; a buffer energy-absorbing layer 2, which is set inside the anti-erosion initial support layer 1; a corrugated waterproof isolation layer 3, which is set between the anti-erosion initial support layer 1 and the buffer energy-absorbing layer 2; a secondary lining layer 4, which is set inside the buffer energy-absorbing layer 2; and n sets of anchor bolts, which are evenly spaced along the inner wall of the anti-erosion initial support layer 1. Each set of anchor bolts includes several grouting anchor bolts 5, which are evenly spaced along the axial direction of the tunnel on the inner wall of the anti-erosion initial support layer 1, where n is an integer not less than 5.

[0022] The application provides a tunnel supporting structure for resisting erosion and time-dependent deformation in red-bed gypsolite stratum.

[0023] In some possible implementation manners, one end of each of the grouting anchor rods 5 is embedded in the inner wall of the anti-erosion primary supporting layer 1, and the other end of each of the grouting anchor rods 5 is embedded in the surrounding rock 7 of the tunnel.

[0024] Specifically, embedding the other end of the grouting anchor rod 5 in the surrounding rock 7 of the tunnel can inject a sulphoaluminate anti-erosion material through the one end embedded in the inner wall of the anti-erosion primary supporting layer 1, so as to adapt to the special erosion in the gypsolite environment, improve the strength of the surrounding rock 7, and reduce the corrosiveness to the surrounding rock 7.

[0025] In some possible implementation manners, the anti-erosion primary supporting layer 1 is an anti-erosion sprayed ultra-high performance concrete structure, and the anti-erosion sprayed ultra-high performance concrete structure is internally arranged with a fiber mesh.

[0026] Specifically, the anti-erosion sprayed super high performance concrete has excellent mechanical properties, corrosion resistance and durability, can effectively resist the erosion of red layer gypsum rock stratum and external force, and provides solid initial protection. The combination of fiber mesh and the anti-erosion sprayed super high performance concrete can improve the mechanical properties of the anti-erosion initial support layer 1.

[0027] In some possible embodiments, the corrugated waterproof isolation layer 3 comprises a plurality of W-shaped corrugated plates, and the plurality of W-shaped corrugated plates are arranged adjacent to the inner wall of the anti-erosion initial support layer 3; the buffer energy absorption layer 2 comprises a plurality of buffer energy absorption pipes, and the plurality of buffer energy absorption pipes are arranged adjacent to the inner wall of the corrugated waterproof isolation layer 3; each buffer energy absorption pipe is made of polyurethane material or is integrally formed by polyurethane material; and the W-shaped corrugated plate is integrally formed by a stainless steel plate or a galvanized steel plate.

[0028] Specifically, the corrugated waterproof isolation layer 3 is obtained by arranging a plurality of W-shaped corrugated plates along the circumferential direction of the inner wall of the tunnel and closely to the inner wall of the anti-erosion initial support layer 1, the W-shaped corrugated plate is integrally formed by a stainless steel plate or a galvanized steel plate, the stainless steel plate and the galvanized steel plate have good elasticity and corrosion resistance, and the W-shaped corrugated plate in a corrugated structure is prepared, which is used to isolate the erosion of water in rock fissures to the tunnel; the buffer energy absorption layer 2 is composed of buffer energy absorption pipes made of polyurethane material or integrally formed by polyurethane material, and is arranged between the corrugated waterproof isolation layer 3 and the secondary lining layer 4, which can effectively absorb the deformation of the surrounding rock 7, play a buffering role, and reduce the stress of the supporting structure caused by the long-term aging deformation of the red rock gypsum stratum surrounding rock 7.

[0029] In some possible embodiments, the secondary lining layer 4 is a cast concrete layer structure, and the cast concrete layer structure is internally arranged with a steel mesh.

[0030] Specifically, the steel mesh can improve the mechanical properties of the cast concrete layer structure and reinforce the supporting structure.

[0031] In some possible embodiments, the anti-erosion initial support layer 1 comprises: an upper support part 11 located above the bottom pavement 6 of the tunnel, (n-2) groups of the anchor rods are uniformly and spacedly arranged along the inner wall of the upper support part 11; and a bottom support part 12 located below the bottom pavement 6 of the tunnel, two groups of the anchor rods are respectively arranged at positions close to the upper support part 11 of the bottom support part 12, and the two groups of the anchor rods are symmetrically arranged with the median line of the bottom pavement 6 of the tunnel as the axis of symmetry.

[0032] Specifically, the grouting anchor rod 5 of the upper support part 11 can adapt to the special erosion in the red-bed gypsum rock stratum environment by injecting aluminum sulfate salt anti-erosion material, and can improve the strength of the surrounding rock 7 and reduce the corrosiveness to the surrounding rock 7; the grouting anchor rod 5 of the bottom support part 12 can prevent arch foot shrinkage and arch collapse, and at the same time, can adapt to the special erosion in the red-bed gypsum rock stratum environment by injecting aluminum sulfate salt anti-erosion material, to avoid bottom heave and further prevent arch foot shrinkage and arch collapse.

[0033] In some possible implementations, the grouting material of each grouting anchor rod 5 is aluminum sulfate salt anti-erosion material.

[0034] Specifically, the aluminum sulfate salt anti-erosion material has strong corrosion resistance and good durability, and can adapt to the special erosion in the red-bed gypsum rock stratum environment.

[0035] Embodiment two As shown in Figs. 1-2 The embodiment two of the present application provides a construction method of a red-bed gypsum rock stratum tunnel anti-erosion and time-dependent deformation support structure, which is constructed in the red-bed gypsum rock stratum tunnel anti-erosion and time-dependent deformation support structure of the above-mentioned embodiment one, and the construction method comprises: anti-erosion initial support layer construction: selecting anti-erosion sprayed ultra-high performance concrete as the sprayed concrete material of the anti-erosion initial support layer, laying a fiber mesh on the tunnel excavation surface, and then spraying the anti-erosion sprayed ultra-high performance concrete on the tunnel excavation surface by using a spraying device to obtain the anti-erosion initial support layer; anchor rod laying: laying grouting anchor rods on the inner wall of the anti-erosion initial support layer by using a drilling device, and injecting sulfur aluminate grouting material; corrugated waterproof isolation layer laying: laying prefabricated W-shaped corrugated plates closely against the inner wall of the anti-erosion initial support layer, and ensuring that any two adjacent W-shaped corrugated plates are firmly connected to obtain the corrugated waterproof isolation layer; buffer energy absorption layer construction: installing prefabricated buffer energy absorption pipes closely against the inner wall of the corrugated waterproof isolation layer, and ensuring that any two adjacent buffer energy absorption pipes are firmly connected to obtain the buffer energy absorption layer; secondary lining layer construction: laying a steel mesh on the inner wall of the buffer energy absorption layer, and then pouring concrete to obtain the secondary lining layer.

[0036] Specifically, the construction sequence of the anti-erosion and time-dependent deformation supporting structure of the red-bed gypsum rock stratum tunnel is the anti-erosion primary supporting layer, the grouting anchor rod, the corrugated waterproof isolation layer, the buffer energy absorption layer and the secondary lining layer. In the construction process of the corrugated waterproof isolation layer, the corrugated waterproof isolation layer needs to be attached to the inner wall of the anti-erosion primary supporting layer to better isolate the erosion of water in the rock fissure on the tunnel. In the construction process of the buffer energy absorption layer, the buffer energy absorption pipes are installed in the longitudinal direction of the tunnel to ensure that the buffer energy absorption layer formed can cover the entire inner wall of the anti-erosion primary supporting layer, and ensure that the buffer energy absorption layers are firmly connected to each other to form a whole, more effectively absorb the deformation of the red-bed gypsum rock stratum surrounding rock, play a buffering role and reduce the influence of the long-term time-dependent deformation of the red-bed gypsum rock stratum surrounding rock on the supporting structure. In the construction of the secondary lining layer, the thickness and density of the secondary lining are ensured to meet the design requirements. In the construction process, the buffer energy absorption pipes of the buffer energy absorption layer are also attached to the inner wall of the corrugated waterproof isolation layer and the secondary lining layer to ensure the strength and integrity of the supporting structure system. It should be noted that the construction method of the anti-erosion and time-dependent deformation supporting structure of the red-bed gypsum rock stratum tunnel in this embodiment two is used in the anti-erosion and time-dependent deformation supporting structure of the red-bed gypsum rock stratum tunnel in the above embodiment one, so the performance principle of the anti-erosion and time-dependent deformation supporting structure of the red-bed gypsum rock stratum tunnel is not repeated here, and the parts not described in detail can be referred to in the embodiment one.

[0037] In some possible implementations, before the construction of the anti-erosion primary supporting layer, the properties of the red-bed gypsum rock stratum are analyzed in detail to comprehensively understand the anti-erosion and deformation adaptability of the tunnel supporting structure.

[0038] Specifically, by analyzing the properties of the red-bed gypsum rock stratum in detail, the anti-erosion and deformation adaptability of the tunnel supporting structure is comprehensively understood, so that the properties of the red-bed gypsum rock stratum can be targeted to select appropriate materials for the anti-erosion primary supporting layer to cope with changes in geological conditions, and suitable grouting materials for grouting can also be selected.

[0039] The above describes in detail the preferred embodiments of the present application. It should be understood that those skilled in the art can make many modifications and changes without creative labor based on the concept of the present application. Therefore, any technical solutions obtained by logical analysis, reasoning or limited experiments based on the prior art by those skilled in the art according to the concept of the present application shall be within the protection scope defined by the claims.

Claims

1. A tunnel support structure against erosion and aging deformation in a red-bed shale formation, characterized by, The tunnel supporting structure against erosion and time-dependent deformation of the red layer paste rock stratum comprises: An initial supporting layer against erosion, which is arranged along the circumferential direction of the inner wall of the tunnel and closely adheres to the inner wall of the tunnel; A buffer and energy absorption layer, which is arranged inside the initial supporting layer against erosion; A corrugated waterproof isolation layer, which is arranged between the initial supporting layer against erosion and the buffer and energy absorption layer; A secondary lining layer, which is arranged inside the buffer and energy absorption layer; n groups of anchor rods, each group of the anchor rods is uniformly and spacedly arranged along the inner wall of the initial supporting layer against erosion, each group of the anchor rods comprises a plurality of grouting anchor rods, the plurality of grouting anchor rods are uniformly and spacedly arranged along the axial direction of the tunnel on the upper edge of the inner wall of the initial supporting layer against erosion, and n is an integer not less than 5.

2. A red-bed shale formation tunnel erosion and time-deformation resistant support structure as defined in Claim 1 wherein: One end of each grouting anchor rod is embedded in the inner wall of the initial supporting layer against erosion, and the other end of each grouting anchor rod is embedded in the surrounding rock of the tunnel.

3. A red-bed shale formation tunnel erosion and time-deformation resistant support structure as defined in Claim 2 wherein: The initial supporting layer against erosion is an erosion-resistant sprayed ultra-high performance concrete structure, and a fiber mesh is arranged inside the erosion-resistant sprayed ultra-high performance concrete structure.

4. A red-bed shale formation tunnel erosion and time-deformation resistant support structure as defined in Claim 3 wherein; The corrugated waterproof isolation layer comprises a plurality of W-shaped corrugated plates, and the plurality of W-shaped corrugated plates are adjacently arranged along the inner wall of the initial supporting layer against erosion; the buffer and energy absorption layer comprises a plurality of buffer and energy absorption pipes, and the plurality of buffer and energy absorption pipes are adjacently arranged along the inner wall of the corrugated waterproof isolation layer; each buffer and energy absorption pipe is made of polyurethane material or integrally formed by polyurethane material.

5. A red-bed shale formation tunnel erosion and time-deformation resistant support structure as defined in Claim 4 wherein: The secondary lining layer is a cast concrete layer structure, and a steel mesh is arranged inside the cast concrete layer structure.

6. An erosion and time-deformation resistant support structure for a red-bed shale tunnel in accordance with claim 5, wherein, The initial supporting layer against erosion comprises: An upper supporting part, which is located in the area above the bottom pavement of the tunnel, and (n-2) groups of the anchor rods are uniformly and spacedly arranged along the inner wall of the upper supporting part; A bottom supporting part, which is located in the area below the bottom pavement of the tunnel, and two groups of the anchor rods are respectively arranged at the bottom supporting part close to the upper supporting part, and the two groups of the anchor rods are symmetrically arranged with the center line of the bottom pavement of the tunnel as the axis of symmetry.

7. A red-bed shale formation tunnel erosion and time-deformation resistant support structure as defined in Claim 6 wherein; The W-shaped corrugated plate is integrally formed by stainless steel plate or galvanized steel plate.

8. A red-bed shale formation tunnel erosion and time-deformation resistant support structure as defined in Claim 7 wherein: The grouting material of each grouting anchor rod is an aluminum sulfate salt erosion-resistant material.

9. A construction method of an anti-erosion and time-deformation supporting structure for a tunnel in a red-bed gypsolite stratum, which is constructed in the anti-erosion and time-deformation supporting structure for a tunnel in a red-bed gypsolite stratum according to claim 8, characterized in that, The construction method comprises: Initial supporting layer against erosion construction: selecting erosion-resistant sprayed ultra-high performance concrete as the sprayed concrete material of the initial supporting layer against erosion, arranging a fiber mesh on the excavation surface of the tunnel, and then spraying the erosion-resistant sprayed ultra-high performance concrete on the excavation surface of the tunnel by using a spraying device to obtain the initial supporting layer against erosion; Anchor rod arrangement: arranging grouting anchor rods on the inner wall of the initial supporting layer against erosion by using a drilling device, and grouting with a sulphoaluminate grouting material; Corrugated waterproof isolation layer arrangement: laying prefabricated W-shaped corrugated plates closely against the inner wall of the initial supporting layer against erosion, and ensuring firm connection between any two adjacent W-shaped corrugated plates to obtain the corrugated waterproof isolation layer; The buffer energy-absorbing layer is constructed by closely installing prefabricated buffer energy-absorbing pipes against the inner wall of the corrugated waterproof isolation layer and ensuring firm connection between any two adjacent buffer energy-absorbing pipes. The secondary lining layer is constructed by arranging a steel bar mesh against the inner wall of the buffer energy-absorbing layer and then pouring concrete to obtain the secondary lining layer.

10. The construction method of a tunnel support structure against erosion and aging deformation in a red-bed shale formation according to claim 9, characterized in that: Before the construction of the anti-erosion primary support layer, the properties of the red-bedded gypsum rock stratum are analyzed in detail, and the anti-erosion and time-dependent deformation adaptability of the support structure of the tunnel are comprehensively understood.

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