CN114704288A - A shock attenuation is from restoring to throne tunnel structure for broken area of fault - Google Patents
A shock attenuation is from restoring to throne tunnel structure for broken area of fault Download PDFInfo
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- CN114704288A CN114704288A CN202210539652.7A CN202210539652A CN114704288A CN 114704288 A CN114704288 A CN 114704288A CN 202210539652 A CN202210539652 A CN 202210539652A CN 114704288 A CN114704288 A CN 114704288A
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- 230000035939 shock Effects 0.000 title claims abstract description 27
- 238000013016 damping Methods 0.000 claims abstract description 29
- 238000010521 absorption reaction Methods 0.000 claims abstract description 17
- 238000009412 basement excavation Methods 0.000 claims abstract description 15
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 15
- 239000011435 rock Substances 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 239000004567 concrete Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 230000006870 function Effects 0.000 abstract description 3
- 239000011359 shock absorbing material Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 230000008439 repair process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002427 irreversible effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 239000002986 polymer concrete Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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Abstract
The invention provides a shock-absorbing self-resetting tunnel structure for a fault fracture zone, which at least comprises a common section and an expanding excavation section corresponding to the fault fracture zone, wherein the expanding excavation section sequentially comprises a primary lining layer, an elastic shock-absorbing layer and a secondary lining layer from outside to inside, the primary lining layer is contacted with surrounding rock, the elastic shock-absorbing layer is filled with elastic shock-absorbing materials, the secondary lining layer is formed by sequentially connecting a plurality of pipe joints, and the pipe joints are fixedly connected through memory alloy springs; the bottoms of the two lining layers are provided with reset frames; and a reset elastic arm is transversely arranged between the two side surfaces of the reset frame and the inner wall of the primary lining layer, and an elastic damping rod for shock absorption and an electric push rod for reset are arranged in the reset elastic arm. This tunnel structure not only has shock attenuation antidetonation function, can reset the tube coupling of dislocation moreover after the macroseism takes place, has reduced the time of salvageing greatly, resumes to pass in the tunnel as early as possible.
Description
Technical Field
The invention belongs to the field of tunnel construction, and particularly relates to a tunnel structure which is used in a fault fracture zone and has a shock absorption self-resetting function.
Background
The existing tunnel supporting structure generally comprises a primary lining and a secondary lining, wherein the primary lining is formed by means of bolting, net hanging, concrete spraying and the like after a tunnel is excavated, and the primary supporting mainly utilizes the strength of surrounding rocks to form a support; the second liner is a complete reinforced concrete structure formed by reinforced concrete inside the primary liner.
When the tunnel passes through a fault or a broken zone, the surrounding rock at the fault or the broken zone is broken and has low strength, so that large deformation is easy to occur. When the tunnel passes through the movable fault, if no corresponding engineering measures are taken, the dislocation of the movable fault, especially the large-displacement dislocation, can cause the serious damage of the tunnel structure, seriously threatens the driving and the life and property safety, and also makes rescue and post-disaster repair difficult to carry out. Therefore, the serious threat of the large displacement active fault dislocation to the tunnel structure is solved, and the tunnel fault is a great technical problem for tunnel engineering construction.
In the aspect of earthquake resistance and fracture resistance of a cross-fault tunnel, the following measures are mainly taken at present: (1) the mechanical property of the tunnel lining material is improved to improve the seismic performance of the structure, for example, steel fiber concrete is adopted to increase damping, polymer concrete is adopted to reduce rigidity, and the like; (2) damping seams are arranged, namely the length of the lining sections is reduced, so that damage is concentrated at the seams when faults are dislocated, and the integral performance of the lining is ensured; (3) according to the possible fault amount of the fault, the section size of the tunnel is enlarged, a porous material is filled between the outer lining and the inner lining, the fault dislocation influence is counteracted through the gap between the outer lining and the inner lining, but the overbreak size is limited by economic factors.
To sum up, although some tunnels are constructed by adopting related measures such as isolation energy dissipation design, hinge design and overexcavation design, the safe operation of the tunnels under the fault activity condition cannot be guaranteed due to the fact that the mode is single and the fault dislocation resistance is limited, and the repair task of the tunnels after the fault activity is arduous, so that a large amount of manpower, material resources and time cost are consumed to repair the tunnels frequently, and the normal passing of the tunnels is influenced.
Disclosure of Invention
The invention solves the defects in the prior art and provides a shock-absorbing self-resetting tunnel structure for a fault fracture zone, which not only has the shock-absorbing and shock-resisting functions, but also can reset the staggered pipe joints after a strong earthquake occurs, thereby greatly shortening the rush-repair time and recovering the traffic in the tunnel as soon as possible.
The technical scheme adopted for realizing the above purpose of the invention is as follows:
a shock absorption self-resetting tunnel structure for a fault fracture zone at least comprises a common section and an expanding excavation section corresponding to the fault fracture zone, wherein the expanding excavation section sequentially comprises a primary lining layer, an elastic shock absorption layer and a secondary lining layer from outside to inside, the primary lining layer is in contact with surrounding rock, the elastic shock absorption layer is filled with elastic shock absorption materials, the secondary lining layer is formed by sequentially connecting a plurality of pipe joints, and the pipe joints are fixedly connected with one another through memory alloy springs;
the bottom of the two lining layers is provided with a reset frame, the top surface of the reset frame is attached to the outer contours of the two lining layers, the bottom of the reset frame is in contact with the primary lining layer, the bottom of the reset frame is provided with a rolling unit, and the reset frame and the primary lining layer can move relatively;
the elastic reset arm is transversely arranged between the two side faces of the reset frame and the inner wall of the primary lining layer, an elastic damping rod for shock absorption and an electric push rod for resetting are arranged in the elastic reset arm, the bottom end of the elastic reset arm is fixed on the inner wall of the primary lining layer, and the top end of the elastic reset arm is hinged to the side face of the reset frame.
The elastic arm that resets evenly sets up along tunnel advancing direction, and the left and right sides that resets that each section of jurisdiction corresponds all corresponds and is provided with the elastic arm that resets.
The reset spring arm comprises:
the bottom plate, the laminate and the top plate are arranged in parallel, and a channel is arranged in the middle of the laminate;
the hinge seat is arranged above the top plate and is used for connecting the reset frame;
the damping rods are arranged between the top plate and the laminated plate, the tops of the damping rods are fixed with the top plate, the bottoms of the damping rods are fixed with the laminated plate, and the distance between the top plate and the laminated plate is elastically variable;
a connecting rod connected between the bottom plate and the laminate and used for fixing the bottom plate and the laminate;
the electric push rod is fixed on the bottom plate, and the telescopic rod of the electric push rod extends out of the channel on the laminate and can stretch up and down.
Four damping rods are arranged and distributed at four corners of the layer plate and the top plate.
The electric push rod is a worm and gear type electric push rod.
And the elastic shock absorption layer is filled with elastic rubber rods or poured with elastic concrete.
Mounting holes for mounting and fixing the memory alloy springs are uniformly distributed on the end surface of the pipe joint, and the mounting holes extend inwards to the inner walls of the two linings along the radial direction; the positions of the mounting holes arranged on different pipe joints are the same.
The reset frame is of a steel truss structure, the rolling unit at the bottom of the reset frame is a steel rolling shaft, and the steel rolling shaft is installed along the advancing direction of the tunnel.
Compared with the prior art, the shock absorption self-resetting tunnel structure for the fault fracture zone provided by the invention has the following advantages: 1. the method comprises the steps of firstly carrying out expanding excavation on a fault fracture zone, arranging the elastic shock absorption layer between the primary lining and the secondary lining, wherein the elastic shock absorption layer can protect the secondary lining and form an elastic protection layer on the periphery of the secondary lining, so that the infringement of the earthquake action received by the tunnel is reduced. 2. When a large-level earthquake occurs, irreversible dislocation can occur between the pipe joints of the two liners, and the dislocation degree between the pipe joints is reduced as much as possible by arranging the memory alloy spring between the pipe joints and elastically connecting the memory alloy spring. 3. After the earthquake takes place, take place irreversible dislocation back between tube coupling and the tube coupling, the frame that resets that sets up in this application can make the tube coupling reset as far as possible with the elastic arm that resets, has reduced the time of salvageing greatly, resumes as early as possible to pass in the tunnel. Meanwhile, the reset elastic arm is connected to the reset frame and is not directly contacted with the pipe joint, so that the situation that the two liner pipe joints are burst by the reset elastic arm when an earthquake occurs can be avoided.
Drawings
Fig. 1 is a schematic overall structure view of a shock-absorbing self-resetting tunnel structure for a fault fracture zone provided by the invention;
FIG. 2 is a cross-sectional view of the enlarged excavation section;
FIG. 3 is a schematic structural diagram of a reset shelf;
FIG. 4 is a schematic structural view of the return spring arm;
FIG. 5 is a schematic view of the elastic arm for resetting;
FIG. 6 is a diagram of a refined finite element model of the shock-absorbing self-resetting tunnel structure provided in the embodiment;
FIG. 7 is a perspective view of a refined finite element model of the shock absorbing self-resetting tunnel structure provided in the embodiment;
FIG. 8 is a diagram of a fine model of the self-resetting tunnel structure with shock absorption provided in the embodiment (including a primary lining, a secondary lining and a shock absorption layer);
in the figure: 1-common section, 2-expanding and digging section, 3-surrounding rock, 4-primary lining, 5-elastic shock-absorbing layer, 6-secondary lining, 7-mounting hole, 8-pipe joint, 9-reset frame, 10-rolling unit, 11-reset elastic arm, 12-bottom plate, 13-layer plate, 14-top plate, 15-hinged seat, 16-damping rod, 17-connecting rod, 18-electric push rod and 19-telescopic rod.
Detailed Description
The present invention will be described in detail with reference to the following embodiments and drawings, but the scope of the present invention is not limited to the following embodiments.
The invention provides a shock-absorbing self-resetting tunnel structure for a fault fracture zone, which has the overall structure shown in figure 1, wherein two sides of the fault fracture zone are normal mountains, and the normal mountains are constructed by adopting a common tunnel structure, namely a common section 1 shown in figure 1; the fault broken zone area needs to be subjected to expanding excavation, namely an expanding excavation section 2, and the section structure of the expanding excavation section is shown in figure 2: expand and dig the section and include in proper order from outer to inner with the primary lining 4 that contacts of country rock 3, the elasticity shock attenuation layer 5 and two linings 6 of filling by elasticity shock attenuation material, adopt the packing of elasticity rubber stick or adopt elastic concrete to pour in the elasticity shock attenuation layer. The two linings are formed by sequentially connecting a plurality of pipe joints 8, mounting holes 7 for mounting and fixing memory alloy springs are uniformly distributed on the end faces of the pipe joints, and the mounting holes extend inwards to the inner walls of the two linings along the radial direction; the positions of the mounting holes arranged on different pipe joints are the same, and the pipe joints are connected and fixed through the memory alloy spring.
The bottom of the two liners is provided with a reset frame 9, the structure of which is shown in figure 3 (the reset frame is formed by assembling a plurality of sections), the top surface of the reset frame is attached to the outer contour of the two liners, the bottom of the reset frame is contacted with the primary liner, the bottom of the reset frame is provided with a rolling unit 10, and the reset frame and the primary liner can move relatively; the reset frame is of a steel truss structure, the rolling unit at the bottom of the reset frame is a steel rolling shaft, and the steel rolling shaft is installed along the advancing direction of the tunnel.
The structure of the reset device is shown in figure 4, a reset elastic arm 11 is transversely arranged between the two side faces of the reset frame and the inner wall of the primary lining, an elastic damping rod for shock absorption and an electric push rod for resetting are arranged in the reset elastic arm, the bottom end of the reset elastic arm is fixed on the inner wall of the primary lining, and the top end of the reset elastic arm is hinged to the side face of the reset frame. The elastic arm that resets evenly sets up along tunnel advancing direction, and the left and right sides that resets that each section of jurisdiction corresponds all corresponds and is provided with the elastic arm that resets. The reset spring arm comprises: a bottom plate 12, a layer plate 13 and a top plate 14 which are arranged in parallel, wherein a channel is arranged in the middle of the layer plate; a hinge seat 15 arranged above the top plate and used for connecting the reset frame; the four damping rods 16 are arranged between the top plate and the layer plate, the tops of the damping rods are fixed with the top plate, the bottoms of the damping rods are fixed with the layer plate, the distance between the top plate and the layer plate is elastically variable, and the four damping rods are distributed at the four corners of the layer plate and the top plate; a connecting rod 17 connected between the bottom plate and the laminate to fix the bottom plate and the laminate; the electric push rod 18 fixed on the bottom plate and the telescopic rod 19 of the electric push rod extend out of the channel on the laminate and can stretch up and down, and the electric push rod is a worm and gear type electric push rod and can obtain a large transmission ratio.
In the construction process, when the tunnel is tunneled to a fault fracture zone, expanding excavation is firstly carried out, after expanding excavation and primary lining construction are finished, and the pipe joints are installed on the premise that the second lining of the common section connected with the expanding excavation section is already constructed, wherein the pipe joints are constructed section by section. Before the first pipe joint of the expanding excavation section is installed, a reset frame is placed firstly, the reset frame is placed on a primary lining of the expanding excavation section, and then the position of the reset frame is adjusted, and then the reset elastic arm is installed. One end of the reset elastic arm is hinged with the side wall of the reset frame, the other end of the reset elastic arm is fixed with the initial lining, and a power line interface of the reset elastic arm is led out from a gap between the pipe joints. The first pipe joint is installed after the resetting elastic arm is installed, the pipe joint is transported in from the outside of the tunnel through the tunnel prefabricated arch wall lining block type transportation and installation integrated machine, and all pipe pieces forming the pipe joint are assembled into a ring and placed on the resetting frame. And then constructing the elastic damping layer between the pipe joint and the primary lining layer, and filling by filling an elastic rubber rod or pouring elastic concrete (a barrier layer is arranged above the reset frame and the reset elastic arm to separate the reset frame and the reset elastic arm from the elastic damping layer). And finally, installing the memory alloy spring, inserting the memory alloy spring into the bottom of the mounting hole from the opening in the inner wall of the pipe joint by a worker, and fixing the end part of the memory alloy spring into the mounting hole through a pressing block and a bolt. And finally, completing the installation of the first pipe joint of the expanding and excavating section, and then circulating the step to install the next pipe joint.
The working principle of the shock-absorbing self-resetting tunnel structure for the fault fracture zone provided by the invention is as follows: when taking place slight earthquake, the broken area of fault produces slight displacement, sets up the elasticity buffer layer this moment between first lining and two linings, and the elasticity buffer layer can form the protection to two linings, forms one deck elasticity inoxidizing coating to the periphery of two linings, reduces the earthquake infringement that the tunnel received, makes the structure in tunnel not receive destruction basically. When the earthquake of big or middle-sized level takes place, the broken area of fault produces great displacement, and this can lead to taking place great rocking between two bushing pipe sections, through set up the memory alloy spring between pipe joint and pipe joint in this application, through the elastic connection of memory alloy spring, reduces the degree of dislocation between the pipe joint as far as. Meanwhile, the pipe joint is displaced due to movement and dislocation, the reset frame is also displaced along with the pipe joint, damping rods in the reset elastic arms arranged on two sides of the reset frame (the telescopic rods of the reset elastic arms are in a contraction state in a normal state, as shown in fig. 4) can play a damping role at the moment, and the shaking of the pipe joint is slowed down as much as possible. After an earthquake occurs, irreversible dislocation occurs between pipe joints, at the moment, according to the dislocation degree of each pipe joint in the transverse direction, an electric push rod in a reset elastic arm is controlled to start (if the pipe joint is dislocated to the left side, the left reset elastic arm of a reset frame is extruded, the left electric push rod of the reset frame is started, and similarly, the electric push rod on the right side of the reset frame is started by dislocation to the right side), the electric push rod is a worm and gear type electric push rod, so that a large transmission ratio can be obtained, in addition, a steel roller mounted in the traveling direction of a tunnel is arranged at the bottom of the reset frame, the pipe joints can be slowly reset through the slow extension of a telescopic rod in the electric push rod (as shown in figure 5), thereby the rush repair time is greatly shortened, and basic traffic in the tunnel is restored as soon as possible (ensuring that life rescue lines are opened as soon as possible). If an earthquake destroys the electric power facilities in the tunnel, the electric power can be generated by the external generator when the tunnel is rush-repaired, and the specific reset elastic arm is supplied with power.
The above-described effect of the shock-absorbing self-resetting tunnel structure for a fault-fracture zone provided in this embodiment is verified by:
the ABAQUS finite element software is adopted to carry out the structural verification of the shock-absorbing self-resetting tunnel of the fault fracture zone (the model does not contain the resetting effect of an electric push rod), as shown in figures 6, 7 and 8. The specific modeling details are as follows: the model is divided into an upper plate, a lower plate and a tunnel structure, wherein the grid type of a soil body, a lining and a shock absorption layer is an 8-node hexahedron linear reduction integral unit (C3D8R), and the grid type of a steel reinforcement framework is a 2-node truss unit (T3D 2); the soil body adopts a mole-coulomb elastic-plastic structure, the reinforcing steel bars and the damping layer adopt a classical plastic structure, the primary lining and the secondary lining adopt Concrete elastic-plastic damage structures (Concrete damaged plastics), and the memory alloy springs between the pipe joints are simulated by elastic units.
The small, medium and large earthquake analysis model is adopted to analyze the dislocation quantity between the pipe joints of the fault zone tunnel and the pipe joints, and is compared with a model without a damping layer, a memory-free sum and a damping rod. Specific results are shown in the following table, and it is found that after the shock-absorbing self-resetting tunnel structure is adopted, under the same conditions, the dislocation amount between the pipe joints is only 24.5%, 18.7% and 16.5% respectively under the condition without any shock-absorbing measures, and the shock-absorbing effect is more obvious along with the increase of the magnitude of the shock (and the effect under the condition without the resetting of the electric push rod).
Dislocation quantity value (unit: mm) between tunnel pipe joints under different working conditions
| Small earthquake | Middle earthquake | Major earthquake | |
| Shock attenuation is from restoring to throne tunnel structure | 2.3 | 4.5 | 6.2 |
| Without any shock-absorbing measures | 9.4 | 24.1 | 37.6 |
Claims (8)
1. A shock attenuation is from restoring to throne tunnel structure for fault fracture area includes ordinary section and the section of digging that expands that corresponds with fault fracture area at least, its characterized in that: the expanded excavation section sequentially comprises a primary lining layer, an elastic damping layer and a secondary lining layer from outside to inside, wherein the primary lining layer is in contact with surrounding rock, the elastic damping layer is filled with elastic damping materials, the secondary lining layer is formed by sequentially connecting a plurality of pipe joints, and the pipe joints are fixedly connected with the pipe joints through memory alloy springs;
the bottom of the two lining layers is provided with a reset frame, the top surface of the reset frame is attached to the outer contours of the two lining layers, the bottom of the reset frame is in contact with the primary lining layer, the bottom of the reset frame is provided with a rolling unit, and the reset frame and the primary lining layer can move relatively;
the elastic reset arm is transversely arranged between the two side faces of the reset frame and the inner wall of the primary lining layer, an elastic damping rod for shock absorption and an electric push rod for resetting are arranged in the elastic reset arm, the bottom end of the elastic reset arm is fixed on the inner wall of the primary lining layer, and the top end of the elastic reset arm is hinged to the side face of the reset frame.
2. The shock-absorbing self-resetting tunnel structure for a fault-breaking zone of claim 1, wherein: the elastic arm that resets evenly sets up along tunnel advancing direction, and the left and right sides that resets that each section of jurisdiction corresponds all corresponds and is provided with the elastic arm that resets.
3. The shock-absorbing self-resetting tunnel structure for a fault-breaking zone of claim 2, wherein: the reset spring arm comprises:
the bottom plate, the laminate and the top plate are arranged in parallel, and a channel is arranged in the middle of the laminate;
the hinge seat is arranged above the top plate and is used for connecting the reset frame;
the damping rods are arranged between the top plate and the laminated plate, the tops of the damping rods are fixed with the top plate, the bottoms of the damping rods are fixed with the laminated plate, and the distance between the top plate and the laminated plate is elastically variable;
a connecting rod connected between the bottom plate and the laminate and used for fixing the bottom plate and the laminate;
the electric push rod is fixed on the bottom plate, and the telescopic rod of the electric push rod extends out of the channel on the laminate and can stretch up and down.
4. The shock-absorbing self-resetting tunnel structure for a fault-breaking zone of claim 3, wherein: four damping rods are arranged and distributed at four corners of the layer plate and the top plate.
5. The shock-absorbing self-resetting tunnel structure for a fault-breaking zone of claim 3, wherein: the electric push rod is a worm and gear type electric push rod.
6. The shock-absorbing self-resetting tunnel structure for a fault-breaking zone of claim 1, wherein: and the elastic shock absorption layer is filled with elastic rubber rods or poured with elastic concrete.
7. The shock-absorbing self-resetting tunnel structure for a fault-breaking zone of claim 1, wherein: mounting holes for mounting and fixing the memory alloy springs are uniformly distributed on the end surface of the pipe joint, and the mounting holes extend inwards to the inner walls of the two linings along the radial direction; the positions of the mounting holes arranged on different pipe joints are the same.
8. The shock-absorbing self-resetting tunnel structure for a fault-breaking zone of claim 1, wherein: the reset frame is of a steel truss structure, the rolling unit at the bottom of the reset frame is a steel rolling shaft, and the steel rolling shaft is installed along the advancing direction of the tunnel.
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| CN202210539652.7A CN114704288B (en) | 2022-05-18 | 2022-05-18 | A shock attenuation is from restoring to throne tunnel structure for broken area of fault |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116006213A (en) * | 2023-01-10 | 2023-04-25 | 广州大学 | Shock insulation structure of shield tunnel and construction method |
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