Corrugated pipe state tunnel structure crossing active fault

Abstract

The application discloses a tunnel structure of a corrugated pipe state crossing an active fault, which comprises a first stratum, a second stratum and an active fault, and further comprises an elastomer, at least two hollow support bodies and a connecting body connecting two adjacent support bodies, the tunnel has an expanded section crossing the active fault, the support body and the connecting body are both rigid, the at least two support bodies are arranged at intervals in the expanded section, the outer peripheral wall of the support body abuts against the inner peripheral wall of the expanded section, and the elastomer comprises a first elastomer and a second elastomer; when the tunnel deforms, the first elastomer can constrain the tunnel from opening deformation, and the second elastomer can constrain the tunnel from extrusion deformation, so that the resistance of the tunnel to a large dislocation of the active fault can be effectively improved, that is, the deformation amount of the tunnel formed when the large dislocation of the active fault occurs is controlled within a specified range, so as to prevent the tunnel structure from being seriously damaged or impaired, and ensure the driving safety in the tunnel.

Description

Technical Field

[0001] This invention relates to the field of underground engineering technology, and in particular to a corrugated pipe tunnel structure for traversing active faults. Background Technology

[0002] In complex geological environments, tunnels inevitably cross active faults. When an active fault shifts, permanent displacement will occur in the strata, leading to serious damage to the tunnel structure.

[0003] Creep slip is the main mode of fault activity and is also a type of dislocation. Active faults that undergo creep slip are called creep faults, and currently, tunnel structures that cross creep faults mainly adopt over-excavation design and articulated design.

[0004] Overcut design is a technique to expand the tunnel cross-section based on the maximum possible dislocation caused by creep faults. However, overcut design is mainly based on resistance, relying on its own stiffness and large clearance to resist stratum deformation. The tunnel structure is easily damaged when large dislocations occur.

[0005] In addition, the articulated design involves setting up multiple relatively independent and rigid tunnel segments within a certain range on both sides of the fault zone, minimizing the length of the tunnel segments, and connecting the tunnel segments with articulations. This allows the tunnel to adapt to the displacement of the creep fault to a certain extent. However, when a large dislocation occurs, it can easily cause excessive tunnel deformation, affecting traffic safety. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a corrugated tube tunnel structure that traverses active faults, effectively enhancing the tunnel's resistance to large dislocations caused by active faults.

[0007] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0008] A corrugated pipe tunnel structure traversing an active fault includes a first stratum and a second stratum, with the active fault located between the first and second strata. The tunnel sequentially passes through the first stratum, the active fault, and the second stratum. It also includes an elastic body, at least two hollow supports, and a connector connecting adjacent supports. The tunnel has a wide-section excavation section that traverses the active fault. Both the supports and the connector are rigid. At least two supports are spaced apart along the tunnel's extension direction within the wide-section, with the outer peripheral wall of each support abutting the inner peripheral wall of the wide-section. The elastic body includes a first elastic body and a second elastic body disposed between every two adjacent supports. When the tunnel deforms along its extension direction, the first elastic body constrains the tunnel's opening deformation, and the second elastic body constrains the tunnel's compression deformation.

[0009] Furthermore, the support is a metal structural component; the cross-sectional shape of the support is annular, horseshoe-shaped, or straight-walled arch.

[0010] Furthermore, the cross-sectional area of ​​the support is greater than the cross-sectional area of ​​the tunnel in the adjacent widened section, and the cross-sectional area of ​​the support is equal to the cross-sectional area of ​​the widened section of the tunnel.

[0011] Furthermore, the inner peripheral wall of the support body has two radially inwardly protruding support walls spaced apart, and the connecting body is disposed between the two adjacent support bodies; the support walls of the two support bodies and the connecting body are fixedly connected by a connector.

[0012] Furthermore, the connecting body is a reinforced concrete structural component.

[0013] Furthermore, the first elastic body is a plurality of springs, which are assembled between two adjacent supports.

[0014] Furthermore, the spring is fixed to the walls of two adjacent supports by welding.

[0015] Furthermore, the second elastic body is a plurality of rubber pads, which are disposed between two adjacent supports, and each rubber pad is located between two adjacent springs; the two ends of the rubber pads along the tunnel extension direction respectively abut against the wall of the support they cooperate with.

[0016] Furthermore, the tunnel has two normal sections and an enlarged section connecting the two normal sections. The normal sections are provided in both the first stratum and the second stratum. The enlarged section passes through the first stratum, the active fault, and the second stratum in sequence. A waterproof layer is provided on the inner circumference of the tunnel.

[0017] Furthermore, longitudinal reinforcement is provided in the normal section of the tunnel, and the longitudinal reinforcement is fixed by welding to the support body that abuts against both ends of the excavated section along the tunnel extension direction.

[0018] The technical solution provided by this invention has the following beneficial effects:

[0019] The large-section excavation section provides a larger clearance, which helps to resist the deformation of the tunnel section caused by the creeping and slipping of the active fault. Furthermore, the support bodies arranged at intervals along the tunnel extension direction (i.e., longitudinal direction) and the connecting bodies connecting adjacent support bodies make the tunnel structure in the excavation section discontinuous in the longitudinal direction, so as to achieve better adaptability to stratum deformation.

[0020] When the tunnel deforms longitudinally, the first elastic body can constrain the tunnel to expand outward, and the second elastic body can constrain the tunnel to compress inward. This can effectively improve the tunnel's resistance to large dislocations caused by active faults. In other words, the amount of tunnel deformation caused by large dislocations caused by active faults is controlled within a specified range to prevent serious damage to the tunnel structure and ensure traffic safety inside the tunnel. Attached Figure Description

[0021] Figure 1 The figure shown is a longitudinal cross-sectional schematic diagram of the corrugated tube tunnel structure that traverses the active fault in the embodiment.

[0022] Figure 2 As shown Figure 1 Enlarged view of area A in the middle;

[0023] Figure 3 The figure shown is a three-dimensional schematic diagram of the connection structure formed by the support and the connector in the embodiment.

[0024] Figure 4 The figure shown is a three-dimensional schematic diagram of the support in the embodiment;

[0025] Figure 5 The figure shown is a three-dimensional schematic diagram of the connector in the embodiment. Detailed Implementation

[0026] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0027] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0028] Reference Figures 1 to 5As shown, this embodiment provides a corrugated pipe tunnel structure traversing an active fault, including a first stratum I and a second stratum II, with an active fault III located between the first stratum I and the second stratum II. The tunnel sequentially passes through the first stratum I, the active fault III, and the second stratum II. The corrugated pipe tunnel structure traversing the active fault (hereinafter referred to as the tunnel structure) also includes an elastic body 9, at least two hollow support bodies 4, and a connecting body 7 connecting two adjacent support bodies 4. The tunnel has a wide-section excavation section, which traverses the active fault III. The support bodies 4 and the connecting body 7 are both rigid. At least two support bodies 4 are spaced apart along the tunnel extension direction in the wide-section. The outer peripheral wall of the support body 4 abuts against the inner peripheral wall of the wide-section. The elastic body 9 includes a first elastic body 5 and a second elastic body 6 disposed between every two adjacent support bodies 4. When the tunnel deforms along its extension direction, the first elastic body 5 can constrain the tunnel opening deformation, and the second elastic body 6 can constrain the tunnel compression deformation.

[0029] In practice, the cross-sectional area of ​​the support body 4 is larger than the cross-sectional area of ​​the tunnel in the adjacent excavation section, and the cross-sectional area of ​​the support body 4 is equal to the cross-sectional area of ​​the excavation section, so as to obtain a large-section excavation section, and the rigid support body 4 can ensure the ability to resist stratum deformation.

[0030] The large-section excavation section can provide a larger clearance, which is beneficial to resist the deformation of the tunnel section formed when the active fault III creeps and shifts.

[0031] Then, by using support bodies 4 spaced apart along the tunnel extension direction (i.e., longitudinal direction) and connecting bodies 7 connecting adjacent support bodies 4, the support bodies 4 and connecting bodies 7 form a structure as follows: Figure 3 The interlocking connection structure shown is designed to make the tunnel structure in the widened section discontinuous in the longitudinal direction, thereby achieving better adaptability to stratum deformation.

[0032] When the tunnel deforms longitudinally, the first elastic body 5 can constrain the tunnel to expand outward, and the second elastic body 6 can constrain the tunnel to compress inward. This can effectively improve the tunnel's resistance to large dislocations caused by the active fault III. In other words, the amount of tunnel deformation caused by large dislocations caused by the active fault III is controlled within the specified range to prevent serious damage to the tunnel structure and ensure traffic safety inside the tunnel.

[0033] More specifically, the tunnel has two normal sections 3 and an enlarged section connecting the two normal sections 3. Normal sections 3 are set in both the first stratum I and the second stratum II. The enlarged section passes through the first stratum I, the active fault III, and the second stratum II in sequence. A waterproof layer 1 is set on the inner circumference of the tunnel. The tunnels adjacent to the enlarged sections are normal sections 3. The two normal sections 3 are located on both sides of the enlarged section.

[0034] A waterproof layer 1 is provided on the inner circumference of the tunnel to prevent water from seeping in from the outside of the tunnel, thus playing a waterproof role and preventing the support body 4, elastic body 9 and connector body 7 from being damaged (such as by corrosion) due to water immersion, so as to ensure the reliability of the tunnel structure.

[0035] In another preferred embodiment, the widened section is provided with a first support and a second support at both ends in the longitudinal direction, and the two normal sections 3 are the first normal section and the second normal section, respectively. The first support abuts against the end of the first normal section near the widened section, and the second support abuts against the end of the second normal section near the widened section. Both normal sections 3 of the tunnel are provided with longitudinal reinforcement 2, which is fixed to the first support and the second support by welding, so that the support 4, the elastic body 9, the connecting body 7 and the normal section 3 are connected to ensure the integrity of the tunnel.

[0036] In another preferred embodiment, the support 4 is a metal structural component, and the cross-sectional shape of the support 4 is annular.

[0037] More specifically, the inner peripheral wall of the support body 4 has two radially inwardly protruding support walls 41 spaced apart, and the connecting body 7 is disposed between the two adjacent support bodies 4. The support walls 41 of the two support bodies 4 and the connecting body 7 are fixedly connected by a connector 8.

[0038] In this specific embodiment, the metal structural component is a pure steel structural component, the connector 7 is a reinforced concrete structural component, the cross-sectional shape of the connector 7 matches the cross-sectional shape of the support 4, and the connector 8 is a bolt.

[0039] The support wall 41 has a first through hole running longitudinally through it, and the connector 7 has a second through hole that matches the first through hole. The bolt 8 passes through the first through hole of the support wall 41 of the two support bodies 4 and the second through hole of the connector 7 to achieve a fixed connection between the support body 4 and the connector 7, and the preload of the bolt 8 is adjusted according to the actual needs on site.

[0040] By ensuring that the stiffness of the support body 4 is greater than that of the connecting body 7, the stress generated when the tunnel deforms longitudinally can be concentrated on the connecting body 7 and the elastic body 9, thereby effectively preventing damage or cracks to the internal structure of the support body 4 when subjected to external forces (such as the stress generated when a large dislocation occurs in the active fault III).

[0041] Of course, in other embodiments, the cross-sectional shape of the support 4 can also be horseshoe-shaped or straight-walled arch-shaped.

[0042] In another preferred embodiment, the first elastic body 5 consists of three springs, which are assembled between two adjacent support bodies 4. Specifically, the springs are fixed to the walls of the two adjacent support bodies 4 by welding, and the walls of the support bodies 4 are the support walls 41.

[0043] When the tunnel undergoes longitudinal displacement deformation (such as a large dislocation occurring in active fault III), on the tension side of the tunnel, the spring is stretched outward by the support body 4 in the longitudinal direction, so that the spring forms an inward retracting elastic force. The support body 4 is restricted by the elastic force generated by the spring, so that the spring can constrain the tunnel to expand outward and effectively protect the tunnel's resistance to deformation in the tension side direction.

[0044] Of course, in other embodiments, the number of springs is not limited to this, and the number of springs is determined according to the tunnel structure and on-site construction conditions.

[0045] More preferably, the second elastic body 6 consists of two rubber pads, which are disposed between two adjacent supports 4, and each rubber pad is located between two adjacent springs. The two ends of the rubber pads along the tunnel extension direction respectively abut against the support walls 41 of the two supports 4 that cooperate with them.

[0046] In a specific embodiment, the tunnel structure is formed according to the following construction method, with the specific steps as follows:

[0047] Step S1: Excavate the normal section 3 of the tunnel and the enlarged section that crosses the active fault III in sequence;

[0048] Step S2: Apply waterproof layer 1 to the entire area of ​​the normal section 3 and the widened section of the tunnel;

[0049] Step S3: The support bodies 4 are installed longitudinally at intervals within the widened section of the tunnel;

[0050] Step S4: Install springs in sequence according to the interval order of spring-rubber pad-spring-rubber pad-spring. The springs are connected to the support body 4 by welding. The rubber pads are filled between adjacent support bodies 4 and stabilized by friction.

[0051] Step S5: Fix the connector 7 between adjacent support bodies 4 and connect them together with bolts 8, and adjust the preload of bolts 8 as needed.

[0052] Step S6: Fix the longitudinal reinforcement 2 in the normal section 3 of the tunnel, and weld the longitudinal reinforcement 2 to the support body 4 to form an integral connection, so as to realize that the concrete of the normal section 3 of the tunnel and the longitudinal reinforcement 2 form an integral whole.

[0053] When the tunnel undergoes longitudinal displacement deformation (such as a large dislocation caused by active fault III), on the pressure side of the tunnel, the rubber pad is longitudinally squeezed and deformed inward by the support body 4, so that the rubber pad forms an outward expansion elastic force. The support body 4 is restricted by the elastic force generated by the rubber pad, so that the rubber pad can constrain the tunnel to compress and deform inward, thereby effectively protecting the tunnel's resistance to deformation in the pressure side direction.

[0054] Of course, in other embodiments, the number of rubber pads is not limited to this, and the number of rubber pads is determined according to the tunnel structure and on-site construction conditions.

[0055] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A corrugated pipe tunnel structure traversing an active fault, comprising a first stratum and a second stratum, wherein the active fault is located between the first stratum and the second stratum, and the tunnel sequentially passes through the first stratum, the active fault, and the second stratum, characterized in that: It also includes an elastomer, at least two hollow supports, and a connector that connects two adjacent supports; The tunnel has a large-section widening section that crosses the active fault. Both the support body and the connecting body are rigid, and at least two support bodies are arranged at intervals along the tunnel extension direction in the widened section, with the outer peripheral wall of the support body abutting the inner peripheral wall of the widened section; The elastic body includes a first elastic body and a second elastic body disposed between every two adjacent supports. When the tunnel deforms along its extension direction, the first elastic body can constrain the tunnel opening deformation, and the second elastic body can constrain the tunnel compression deformation. The inner peripheral wall of the support has two radially inwardly protruding support walls that are spaced apart, and the connecting body is disposed between the two adjacent support bodies; the support walls of the two support bodies and the connecting body are fixedly connected by a connector. The first elastic body is a plurality of springs, which are assembled between two adjacent support bodies; The second elastic body consists of multiple rubber pads, which are disposed between two adjacent supports, and each rubber pad is located between two adjacent springs; the two ends of the rubber pads along the tunnel extension direction respectively abut against the wall of the support they cooperate with.

2. The corrugated pipe tunnel structure for traversing active faults according to claim 1, characterized in that: The support is a metal structural component; the cross-sectional shape of the support is annular, horseshoe-shaped, or straight-walled arch.

3. The corrugated pipe tunnel structure for traversing active faults according to claim 1, characterized in that: The cross-sectional area of ​​the support is greater than the cross-sectional area of ​​the tunnel in the adjacent excavation section, and the cross-sectional area of ​​the support is equal to the cross-sectional area of ​​the tunnel excavation section.

4. The corrugated pipe tunnel structure for traversing active faults according to claim 1, 2, or 3, characterized in that: The connector is a reinforced concrete structural component.

5. The corrugated pipe tunnel structure for traversing active faults according to claim 1, characterized in that: The spring is fixed to the walls of two adjacent supports by welding.

6. The corrugated pipe tunnel structure for traversing active faults according to claim 1, 2, or 3, characterized in that: The tunnel has two normal sections and an enlarged section connecting the two normal sections. The normal sections are located in both the first and second strata. The enlarged section passes through the first stratum, the active fault, and the second stratum in sequence. A waterproof layer is provided on the inner circumference of the tunnel.

7. The corrugated pipe tunnel structure for traversing active faults according to claim 6, characterized in that: The normal section of the tunnel is equipped with longitudinal reinforcement, which is fixed by welding to the support body that abuts against both ends of the excavated section along the tunnel extension direction.

Images