Tunnel surrounding rock large-deformation yielding supporting structure combined with damping energy dissipation

Abstract

The invention discloses a tunnel surrounding rock large-deformation yielding supporting structure combined with damping energy dissipation. The tunnel surrounding rock large-deformation yielding supporting structure sequentially comprises a primary support, a honeycomb aluminum yielding supporting layer, a rubber damping layer, a secondary lining and steel bar anchors from outside to inside. The honeycomb aluminum yielding supporting layer is composed of an aluminum plate and a honeycomb aluminum component, and honeycomb aluminum holes in the honeycomb aluminum component vertically face the inner contour line of the tunnel. The honeycomb aluminum yielding supporting layer bears surrounding rock pressure, meanwhile, deformation is expanded and transmitted to the rubber damping layer, and the material energy consumption of the rubber damping layer is increased; the rubber damping layer absorbs and dissipates energy and also has a tunnel waterproof effect; the rubber damping layer and the honeycomb aluminum yielding supporting layer are fixed to the primary support through the steel bar anchor nails, and then a secondary lining is constructed. The tunnel yielding supporting structure has the advantages that the honeycomb aluminum yielding supporting layer can enhance the tunnel supporting capacity, deformation is expanded and transmitted to the rubber damping layer, and the rubber damping layer absorbs and dissipates energy, so that the deformation coordination capacity of the tunnel yielding supporting structure is enhanced, secondary lining concrete is prevented from cracking, and the safety of the tunnel yielding supporting structure is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel engineering, and in particular to a tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation. Background Art

[0002] With the development of the western part of the country, tunnel construction is also developing towards large spans, deep burial depths, and long lines. Large deformation of tunnel surrounding rocks caused by high ground stress and soft rock is an inevitable technical problem in building tunnels in complex geological environments.

[0003] For large deformation of tunnel surrounding rock, traditional support forms lack a certain deformation amount to release the deformation of surrounding rock, which leads to problems such as damage to tunnel support structure and instability of surrounding rock. In order to release the deformation of surrounding rock and enhance the bearing capacity of tunnel support structure, it is necessary to design a large deformation yielding support structure of tunnel surrounding rock with combined damping energy dissipation, strengthen the stiffness of tunnel yielding support structure, and set a certain deformation amount at the same time to increase the deformation coordination ability of tunnel yielding support structure, avoid secondary lining cracking, and ensure the safety of tunnel yielding support structure. Summary of the invention

[0004] The purpose of the present invention is to disclose a tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation, which is used to strengthen the rigidity of the tunnel yielding support structure. At the same time, a certain deformation amount is set to increase the deformation coordination ability of the tunnel yielding support structure, avoid secondary lining cracking, and ensure the safety of the tunnel yielding support structure.

[0005] In order to achieve the above-mentioned purpose, the present invention discloses a tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation, which comprises, from outside to inside, initial support, honeycomb aluminum yielding support layer, rubber damping layer, secondary lining and steel anchor nails; the honeycomb aluminum yielding support layer is composed of aluminum plates and honeycomb aluminum components, and the direction of the honeycomb aluminum holes in the honeycomb aluminum components is arranged perpendicular to the inner contour line of the tunnel; the honeycomb aluminum yielding support layer, while bearing the surrounding rock pressure, transfers the deformation expansion to the rubber damping layer, thereby increasing the material energy consumption of the rubber damping layer; the rubber damping layer absorbs and dissipates energy, while also taking into account the waterproofing effect of the tunnel; the steel anchor nails fix the rubber damping layer and the honeycomb aluminum yielding support layer on the initial support, and then the secondary lining is applied.

[0006] In the above-mentioned tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation, the thickness of the honeycomb aluminum yielding support layer is 10-20 cm.

[0007] In the above-mentioned tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation, the honeycomb aluminum holes of the honeycomb aluminum yielding support layer are regular hexagons with a side length of 0.2 to 1 cm.

[0008] In the above-mentioned tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation, the thickness of the rubber damping layer is 8 to 15 cm.

[0009] In the above-mentioned tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation, the steel bar strength model of the steel bar anchor bolts is HRB400, and they are arranged in a plum blossom shape with an arrangement spacing of 0.4 to 1 m.

[0010] In the above-mentioned tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation, the initial support is implemented by shotcrete.

[0011] In the above-mentioned tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation, the secondary lining structure adopts a reinforced concrete structure.

[0012] The present invention has the following beneficial effects: In the present invention, the honeycomb aluminum yielding support layer can provide a larger supporting force and enhance the rigidity of the structure. At the same time, the aluminum alloy has a certain ductility, and can expand the deformation caused by the surrounding rock and transfer it to the rubber damping layer, thereby increasing the material energy consumption of the rubber damping layer. The rubber damping layer absorbs and dissipates the energy, and can also take into account the waterproofing effect of the tunnel. Through the combined effect of the honeycomb aluminum yielding support layer and the rubber damping layer, the rigidity of the tunnel yielding support structure is strengthened, and the deformation coordination ability of the tunnel yielding support structure is enhanced, the secondary lining concrete is prevented from cracking, and the safety of the tunnel yielding support structure is ensured.

[0013] In summary, the present invention is a tunnel surrounding rock large deformation yielding support structure that can ensure the safety of the tunnel surrounding rock under large deformation, and has a simple construction process and is technically feasible. It is a combined damping energy dissipation tunnel surrounding rock large deformation yielding support structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 It is a schematic diagram of the structural cross-section of the present invention.

[0016] Figure 3 This is a stereoscopic diagram of the honeycomb aluminum pressure-yielding support layer and the rubber damping layer of the present invention.

[0017] Figure 4 It is a schematic diagram of the expansion of the honeycomb aluminum compression support layer of the present invention when no force is applied.

[0018] Figure 5 It is a schematic diagram of the expansion of the honeycomb aluminum compression support layer of the present invention when subjected to stress.

[0019] In the attached drawings: 1 is the initial support; 2 is the rubber damping layer; 3 is the honeycomb aluminum pressure-yielding support layer; 4 is the secondary lining; 5 is the steel bar anchor; 21 is the aluminum plate; and 22 is the honeycomb aluminum component. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] See also Figure 1~Figure 3 , from outside to inside, it includes initial support 1, honeycomb aluminum yield support layer 2, rubber damping layer 3, secondary lining 4, and steel anchor nails 5; the honeycomb aluminum yield support layer 2 is composed of an aluminum plate 21 and a honeycomb aluminum component 22, and the honeycomb aluminum holes in the honeycomb aluminum component 22 are arranged perpendicular to the inner contour line of the tunnel; while the honeycomb aluminum yield support layer 2 bears the surrounding rock pressure, it transfers the deformation expansion to the rubber damping layer 3, increasing the material energy consumption of the rubber damping layer 3; the rubber damping layer 3 absorbs and dissipates the energy, and at the same time can also take into account the waterproofing of the tunnel; the steel anchor nails 5 fix the rubber damping layer and the honeycomb aluminum yield support layer on the initial support 1, and then the secondary lining 4 is applied.

[0022] See also Figure 4 and Figure 5 When the combined compression-yielding support structure is subjected to stress, the bending deformation of the rubber damping layer 3 is greater than the bending deformation of the honeycomb aluminum compression-yielding support layer 2. At the same time, if only the rubber damping layer 3 is set and the honeycomb aluminum compression-yielding support layer 2 and the rubber damping layer 3 are set at the same time, the bending deformation of the rubber damping layer 3 is greater when the honeycomb aluminum compression-yielding support layer 2 and the rubber damping layer 3 are set at the same time. Therefore, when the combined compression-yielding support structure is subjected to stress, the honeycomb aluminum compression-yielding support layer 2 has an amplifying effect similar to that of a lever, which can increase the deformation of the rubber damping layer 3, thereby increasing the material energy consumption of the rubber damping layer 3 and achieving a better compression-yielding effect.

[0023] See also Figure 1~Figure 5 , the construction steps of the present invention are: Step 1: After the initial support 1 is constructed by shotcrete, remove the sharp objects on the surface of the initial support 1 and ensure that the flatness of the initial support 1 meets the requirement of D / L≤1 / 6 (D is the depth of the concave of two adjacent convex surfaces on the initial support surface; L is the distance between two adjacent concave surfaces on the initial support surface); Step 2: Lay the honeycomb aluminum pressure relief support layer 2, the thickness of the honeycomb aluminum pressure relief support layer is 10~20cm, and the honeycomb aluminum pressure relief support layer is composed of an aluminum plate 2.1 set on the upper and lower sides of the honeycomb aluminum component 2.2. The honeycomb aluminum hole is a regular hexagon with a side length of 0.2~1cm, and the direction of the honeycomb aluminum hole is perpendicular to the tunnel contour line; it is fixed to the initial support 1 with steel anchor nails 5. The steel strength model of the steel anchor nails is HRB400, and they are arranged in a plum blossom shape with an arrangement spacing of 0.4~1m.

[0024] Step 3: Lay the rubber damping layer 3 with a thickness of 8 to 15 cm. Use steel anchors 5 to pass through the honeycomb aluminum to fix the compression support layer on the initial support 1. The steel strength model of the steel anchors is HRB400. They are arranged in a plum blossom shape with a spacing of 0.4 to 1 m.

[0025] Step 4: construct the secondary lining 4, the structure adopts reinforced concrete structure.

Claims

1. A tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation, characterized in that: From the outside to the inside, it includes an initial support (1), a honeycomb aluminum pressure-relieving support layer (2), a rubber damping layer (3), a secondary lining (4), and a steel anchor (5); the honeycomb aluminum pressure-relieving support layer is composed of an aluminum plate (21) and a honeycomb aluminum component (22); the honeycomb aluminum holes in the honeycomb aluminum component (22) are arranged vertically toward the inner contour line of the tunnel; The honeycomb aluminum yielding support layer (2) transmits the deformation expansion to the rubber damping layer (3) while bearing the surrounding rock pressure, thereby increasing the material energy consumption of the rubber damping layer (3); the rubber damping layer (3) absorbs and dissipates the energy, while also taking into account the waterproofing effect of the tunnel; the steel anchor nails (5) fix the rubber damping layer (3) and the honeycomb aluminum yielding support layer on the initial support (1), and then the secondary lining (4) is applied.

2. A tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation according to claim 1, characterized in that: The thickness of the honeycomb aluminum yield support layer (2) is 10-20 cm.

3. A tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation according to claim 2, characterized in that: The honeycomb aluminum holes in the honeycomb aluminum pressure-yielding support layer (2) are regular hexagons with a side length of 0.2 to 1 cm. According to the tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation as described in claim 2, it is characterized in that the honeycomb aluminum holes in the honeycomb aluminum yielding support layer (2) are regular hexagons with a side length of 0.2 to 1 cm.

4. A tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation according to claim 1, characterized in that: The thickness of the rubber damping layer (3) is 8 to 15 cm.

5. A tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation according to claim 1, characterized in that: The steel bar strength model of the steel bar anchor nails (5) is HRB400, and they are arranged in a plum blossom shape with an arrangement spacing of 0.4 to 1 m.

6. A tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation according to claim 1, characterized in that: The initial support (1) is implemented by shotcrete.

7. A tunnel surrounding rock large deformation yielding support structure with combined damping energy dissipation according to claim 1, characterized in that: The structure of the secondary lining (4) adopts a reinforced concrete structure.

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