Deformation-allowed tunnel lining structure in voluntary system phyllite stratum

Abstract

The utility model discloses a deformation-allowed tunnel lining structure in a voluntary system phyllite stratum. The tunnel lining structure sequentially comprises a secondary lining layer, an asphalt concrete layer, a primary lining layer and a surrounding rock layer from outside to inside, a deformation release assembly is connected between the primary lining layer and the secondary lining layer and arranged in the length direction of the tunnel, the top face of the deformation release assembly is attached and fixed to the primary lining layer, the bottom face of the deformation release assembly is attached and fixed to the secondary lining layer, and a cavity between the primary lining layer and the secondary lining layer is filled with an asphalt concrete layer. The deformation release assembly comprises an upper steel plate and a lower steel plate, the lower steel plate is located under the upper steel plate and arranged in parallel, a rubber elastic support and a sliding ball joint are further arranged between the upper steel plate and the lower steel plate, the rubber elastic support is located on the left side of the deformation release assembly, and the sliding ball joint is located on the right side of the deformation release assembly.

Description

TECHNICAL FIELD

[0001] The utility model belongs to tunnel lining technical field, concretely relates to a tunnel lining structure in silurian system phyllite stratum of allowing deformation can effectively control tunnel deformation and release surrounding rock expansion stress. BACKGROUND

[0002] The silurian system phyllite stratum is characterized by weak rock stratum, has the characteristics of strong expansibility and large deformation. In the tunnel construction process, the interaction between the surrounding rock and the supporting structure is complex, especially the expansibility of phyllite may lead to stress concentration of surrounding rock, thereby causing damage to the lining structure. Therefore, how to reasonably release the expansion stress of phyllite surrounding rock under the premise of ensuring the stability of the tunnel has become an important issue in current tunnel construction. The existing tunnel supporting structure often uses high-rigidity supporting structure when dealing with phyllite stratum, but this kind of structure has limitations in dealing with surrounding rock deformation and stress release, and cannot effectively adapt to the unique geological environment of phyllite, which may cause lining cracking or damage and cannot effectively release the expansion stress of surrounding rock. Therefore, a new tunnel lining structure is urgently needed, which can moderately allow the deformation of phyllite while ensuring the stability of the tunnel, release the expansion stress of surrounding rock and prolong the service life of the tunnel. SUMMARY

[0003] The utility model provides a tunnel lining structure in silurian system phyllite stratum of allowing deformation, the purpose lies in weak rock stratum is characterized by strong expansibility and large deformation, the tunnel lining structure can moderately allow the deformation of phyllite while ensuring the stability of the tunnel, release the expansion stress of surrounding rock.

[0004] Therefore, the utility model adopts the following technical scheme:

[0005] A tunnel lining structure in silurian system phyllite stratum of allowing deformation, the tunnel lining structure comprises, from outside to inside, a secondary lining layer, an asphalt concrete layer, a primary lining layer and a surrounding rock layer. A deformation release assembly is connected between the primary lining layer and the secondary lining layer. The deformation release assembly is arranged along the length direction of the tunnel. The top surface of the deformation release assembly is fixed to the primary lining layer, and the bottom surface is fixed to the secondary lining layer. The cavity between the primary lining layer and the secondary lining layer is filled with the asphalt concrete layer.

[0006] The deformation release assembly includes an upper steel plate and a lower steel plate. The lower steel plate is located directly below the upper steel plate and arranged parallel to it. A rubber elastic support and a sliding ball joint are also provided between the upper and lower steel plates. The rubber elastic support is located on the left side of the deformation release assembly, and the sliding ball joint is located on the right side of the deformation release assembly. The rubber elastic support is composed of steel sheets and rubber sheets stacked in sequence. The sliding ball joint includes a ball socket and a ball head rod. The ball socket is fixed to the lower steel plate with its opening facing upward, the ball head rod is vertically downward and its top is fixed to the upper steel plate, and the lower end of the ball head rod is inserted into the ball socket. The inner cavity of the ball socket is cylindrical, the top of the ball socket is connected to a limiting plate, and the ball socket is filled with asphalt.

[0007] Furthermore, the upper steel plate is fixed to the primary lining layer by bolts, and the lower steel plate is fixed to the secondary lining layer by bolts.

[0008] Furthermore, the distance between adjacent deformation release components is 4-6 meters.

[0009] The beneficial effects of the present invention are:

[0010] 1. Flexible design of the lining structure: By using flexible concrete as the primary lining, the lining layer is able to adapt to the deformation of the surrounding rock within a certain range, helping to release the stress of the surrounding rock;

[0011] 2. Deformation relief components: Rubber elastic bearings and sliding ball joints are designed at key locations of the lining structure to achieve a certain degree of deformation according to the expansion of the surrounding rock, thereby appropriately adjusting the stress distribution of the lining structure and alleviating the pressure concentration caused by surrounding rock expansion. The multiple buffering mechanisms formed by the rubber elastic bearings, sliding ball joints, and flexible support layers can effectively reduce the direct impact of seismic waves on the structure and reduce the risk of cracks.

[0012] 3. Strengthening the lining's anti-deformation capacity: Anchor support is designed on the outer layer of the lining structure to ensure sufficient overall stability under flexible design. It can be flexibly adjusted according to actual working conditions and is suitable for tunnel projects under various geological conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the tunnel lining structure of the utility model;

[0014] Figure 2 It is a cross-sectional schematic diagram of the deformation release component of the utility model;

[0015] Figure 3 This is a schematic cross-sectional view of the rubber elastic support of the deformation release component of the present invention;

[0016] Figure 4 It is a schematic cross-sectional view of the sliding ball joint of the deformation release assembly of the utility model;

[0017] Figure 5is a top view of the deformation release assembly of the utility model;

[0018] In the figure: 1-surrounding rock layer, 2-initial lining layer, 3-deformation release assembly, 4-asphalt concrete layer, 5-second lining layer, 31-upper steel plate, 32-lower steel plate, 33-steel sheet, 34-rubber sheet, 35-ball socket, 36-ball head rod, 37-asphalt, 38-bolt. DETAILED DESCRIPTION

[0019] The utility model will be further described in connection with the drawings and specific embodiments:

[0020] As Figure 1 shown, the tunnel lining structure sequentially includes the second lining layer 5, the asphalt concrete layer 4, the initial lining layer 2 and the surrounding rock layer 1 from outside to inside, and each layer is formed by construction successively from inside to outside, wherein the asphalt concrete layer 4 is provided with a plurality of deformation release assemblies 3 at intervals along the ring, the deformation release assembly 3 separates the asphalt concrete layer 4 into a plurality of segments along the ring of the tunnel, and the left and right ends of the deformation release assembly 3 are connected to the asphalt concrete layer 4, the top surface is fixed to the initial lining layer 2, and the bottom surface is fixed to the second lining layer 5.

[0021] As Figures 2-4 shown, the deformation release assembly 3 includes the upper steel plate 31 and the lower steel plate 32, the lower steel plate 32 is located directly below the upper steel plate 31 and is arranged in parallel, and a rubber elastic support and a sliding ball joint are further arranged between the upper steel plate 31 and the lower steel plate 32, the rubber elastic support is located on the left side of the deformation release assembly 3, and the sliding ball joint is located on the right side of the deformation release assembly 3; the rubber elastic support is composed of the steel sheet 33 and the rubber sheet 34 in turn, the sliding ball joint includes the ball socket 35 and the ball head rod 36, the ball socket 35 is fixed on the lower steel plate 32 with the opening facing upward, the ball head rod 36 is vertically downward and the top end is fixed on the upper steel plate 31, and the lower end of the ball head rod 36 penetrates into the ball socket 35; the inner cavity of the ball socket 35 is cylindrical, a limiting plate is connected to the top of the ball socket 35, and the ball socket is filled with asphalt.

[0022] The tunnel lining structure of the utility model mainly consists of the following parts:

[0023] 1. The initial lining layer 2 is made of flexible concrete, has a certain compressive strength, and allows the lining to produce a small deformation when the surrounding rock expands.

[0024] 2. The asphalt concrete layer 4 has high deformation capacity and can adapt to the expansion deformation of the surrounding rock to avoid excessive stress on the main structure of the lining.

[0025] 3. The deformation release assembly 3 includes a pre-embedded rubber elastic support and a sliding ball joint, which can release stress through a small amount of sliding or elastic deformation when the surrounding rock expands, preventing the cracking and damage of the lining structure.

[0026] Working Principle of Deformation Release Component 3: Deformation Release Component 3 buffers and absorbs the expansion stress of the surrounding rock through elastic deformation, converting it into elastic potential energy, thereby reducing the direct impact on the lining structure. The elastic element effectively releases stress in the surrounding rock, preventing cracking or damage to the lining structure.

[0027] Installation method: The support can be fixed to the designed position of the lining structure by means of bolts to ensure its stability under stress.

[0028] Design location: The rubber elastic bearing is designed to be installed between the flexible concrete primary lining and the secondary lining at equal distances.

[0029] Sliding ball joints have a high degree of freedom and are suitable for sliding in multiple directions.

[0030] Working principle: The ball head rod 36 allows the lining structure to slide relative to each other after being subjected to force, reducing the interaction force between different components, thereby reducing the stress concentration caused by the deformation of the surrounding rock.

[0031] Reinforcement measures: Steel mesh can be added to the outside of the lining or anchor support can be applied to ensure the overall stability of the structure, especially during the long-term operation of the tunnel.

[0032] The construction method of the lining structure of the utility model is as follows:

[0033] 1. Laying the primary lining 2;

[0034] 2. Install deformation relief components 3 on the primary lining 2 structure every 5m. Connect the upper steel plate 31 of the deformation relief components 3 to the primary lining 2 with bolts.

[0035] 3. Laying the second lining layer 5;

[0036] 4. Connect and fix the deformation relief assembly 3 and the secondary lining 5, so as to achieve complete fixation of the deformation relief assembly 3: the lower steel plate 32 of the deformation relief assembly 3 is connected to the primary lining 2 by bolts;

[0037] 5. After the secondary lining 5 is laid, asphalt concrete is filled between the primary lining 2 and the secondary lining 5 to prevent the asphalt concrete from entering the deformation release component 3. The ball socket 35 of the deformation release component 3 is filled with asphalt.

Claims

1. A tunnel lining structure in a deformation-tolerant Silurian phyllite formation, characterized in that: The tunnel lining structure includes, from the outside to the inside, a secondary lining layer (5), an asphalt concrete layer (4), a primary lining layer (2) and a surrounding rock layer (1); a deformation release component (3) is connected between the primary lining layer (2) and the secondary lining layer (5); the deformation release component (3) is arranged along the length direction of the tunnel; the top surface of the deformation release component (3) is adhered and fixed to the primary lining layer (2), and the bottom surface is adhered and fixed to the secondary lining layer (5); the cavity between the primary lining layer (2) and the secondary lining layer (5) is filled with an asphalt concrete layer (4); The deformation release component (3) includes an upper steel plate (31) and a lower steel plate (32), the lower steel plate (32) is located directly below the upper steel plate (31) and is arranged in parallel, and a rubber elastic support and a sliding ball joint are further provided between the upper steel plate (31) and the lower steel plate (32), the rubber elastic support is located on the left side of the deformation release component (3), and the sliding ball joint is located on the right side of the deformation release component (3); the rubber elastic support is composed of a steel sheet (33) and a rubber sheet (34) stacked in sequence, and the sliding ball joint includes a ball socket (35) and a ball head rod (36), the ball socket (35) is fixed on the lower steel plate (32) with its opening facing upward, the ball head rod (36) is vertically facing downward and its top end is fixed to the upper steel plate (31), and the lower end of the ball head rod (36) penetrates into the ball socket (35); the inner cavity of the ball socket (35) is cylindrical, the top of the ball socket (35) is connected to a limiting plate, and the ball socket is filled with asphalt.

2. The tunnel lining structure in the Silurian phyllite stratum with deformation tolerance according to claim 1, characterized in that: The upper steel plate (31) is fixed to the primary lining layer (2) by means of bolts, and the lower steel plate (32) is fixed to the secondary lining layer (5) by means of bolts.

3. The tunnel lining structure in the Silurian phyllite stratum with deformation tolerance according to claim 1, characterized in that: The distance between adjacent deformation release components (3) is 4-6 meters.

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