CN210422632U - Double-layer anti-fault structure for tunnel penetrating through creeping fault - Google Patents
Double-layer anti-fault structure for tunnel penetrating through creeping fault Download PDFInfo
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- CN210422632U CN210422632U CN201921241263.6U CN201921241263U CN210422632U CN 210422632 U CN210422632 U CN 210422632U CN 201921241263 U CN201921241263 U CN 201921241263U CN 210422632 U CN210422632 U CN 210422632U
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Abstract
The utility model discloses a double-layer anti-fault structure of a tunnel passing through a creeping fault, which comprises an over-digging section arranged at the position of the creeping fault, an outer anti-fault layer with the total thickness equal to the over-digging size, a primary support and an inner anti-fault layer; the outer layer fault-resistant layer is made of a tough material and is tightly attached to the overexcavation contour line of the tunnel; the primary support is arranged on the inner side of the outer anti-fault layer; the inner layer fracture resistance is made of a tough material and is arranged on the inner side of the primary support; the secondary lining of the tunnel of the overexcavation section is arranged on the inner side of the inner anti-fault layer, and the shape and the size of the secondary lining are the same as those of the secondary lining of the tunnel of the normal passing section. The utility model has no sudden expansion or reduction of the section, and does not need to design a secondary lining or use a new template trolley independently, thereby overcoming the defect of the existing 'over digging design'; the anti-fracture layer allows the stratums at two sides of the fault to generate larger dislocation and does not generate excessive influence on the secondary lining of the tunnel at the overexcavation section, so that the tunnel is protected from being damaged, and the elevation and the smoothness of the track laid in the secondary lining of the tunnel at the overexcavation section are ensured.
Description
Technical Field
The utility model relates to a tunnel engineering technical field specifically is a pass through double-deck anti fault layer structure of creep fault tunnel.
Background
In actual engineering, tunnels sometimes inevitably cross active faults. When the active fault moves in a dislocation way, permanent displacement which is difficult to resist by any supporting structure can be generated in the stratum, so that the tunnel structure is seriously damaged, and damages such as cracking, dislocation and the like can be caused. Tunnel engineering is a permanent structural engineering which cannot be reconstructed and is difficult to repair once it is broken, and therefore the impact of such a break on the safety of the tunnel and even the entire line of operation is immeasurable.
Creep slip is one of the two main modes of fault activity, which is a slow sliding process of fault areas generated by fault fracture zones over time, and is therefore a form of motion that is slow and has time to accumulate effects. The anti-seismic measures for crossing a creep and slip fault zone tunnel applied to the engineering at present are 'overbreak design' and 'hinge design'. The 'overexcavation design' is to enlarge the section size of the tunnel during the tunnel construction according to the maximum dislocation amount possibly generated by the creep fault; the 'hinged design' is that the length of the tunnel segment is reduced as much as possible, so that the fault zone and segments in a certain range on two sides of the fault zone are kept relatively independent, and flexible connection with relatively low rigidity is adopted among rigid tunnel segments.
The tunnel adopting the 'overexcavation design' reserves the dislocation amount of the creeping fault in advance, so that the influence of fault dislocation on the tunnel structure is avoided. However, the situation that the section is suddenly enlarged and suddenly reduced at the section of seismic fortification due to overexcavation can result in the tunnel lining, such sudden change can increase the on-way damping when the air flows, thereby increasing the critical wind speed in the tunnel, causing the smoke to be difficult to discharge or increasing the operation cost, and simultaneously, because the design of "overexcavating" requires the tunnel secondary lining to be tightly attached to the cave wall after the overexcavation, the secondary lining type of the overexcavation section needs to be designed separately and a new template trolley is used, thereby increasing the design, the construction difficulty and the cost. The 'hinged design' is adopted, although the tunnel can adapt to the displacement of a creeping fault to a certain extent through flexible connection, the tunnel adapting to the displacement of the fault is difficult to ensure the smoothness of the track, and therefore the comfort of passengers and even the operation safety are affected.
SUMMERY OF THE UTILITY MODEL
To the above problem, an object of the utility model is to provide a ventilation does not have the sectional sudden expansion or reduce, also need not independent design secondary lining or uses new template platform truck and can guarantee the track elevation of laying in the tunnel secondary lining of section of digging over, ride comfort pass through the double-deck anti-fault layer structure of creeping fault tunnel. The technical scheme is as follows:
a tunnel double-layer anti-fracture layer structure passing through a creeping fault comprises an overexcavation section arranged at the creeping fault, an outer layer anti-fracture layer, a primary support and an inner layer anti-fracture layer, wherein the total thickness of the outer layer anti-fracture layer, the primary support and the inner layer anti-fracture layer are equal to the overexcavation size; the outer layer fracture resistance is made of a material with small elastic modulus and good toughness and is arranged close to the tunnel overexcavation contour line; the primary support is a flexible hinged support and is arranged on the inner side of the outer anti-fault layer; the inner layer fracture resistance is also made of a material with small elastic modulus and good toughness and is arranged on the inner side of the primary support; the secondary lining of the tunnel of the overexcavation section is arranged at the inner side of the inner layer anti-fault layer, and the shape and the size of the secondary lining are the same as those of the secondary lining of the tunnel of the normal passing section at two ends of the overexcavation section.
Further, the thickness of the outer layer fault-resistant layer is smaller than that of the inner layer fault-resistant layer.
Furthermore, the elastic modulus of the outer layer fault-resistant layer and the inner layer fault-resistant layer is 0.5-5 Mpa.
A construction method for traversing a creep fault tunnel double-layer fracture-resistant layer comprises the following steps:
step 1: performing overbreak on the tunnel which passes through the creep fracture and is within the length of the seismic fortification section;
step 2: applying an outer anti-fault layer in a tunnel clearance of the overexcavation section by clinging to a tunnel overexcavation contour line;
and step 3: constructing primary support on the outer anti-fault layer;
and 4, step 4: constructing an inner-layer anti-fault on the primary support, wherein the total thickness of the outer-layer anti-fault, the primary support and the inner-layer anti-fault is equal to the overbreak size;
and 5: and building the secondary lining of the overexcavation section tunnel in the inner layer fracture-resistant layer by using the same template trolley as the secondary lining of the normal passing section tunnel.
The utility model has the advantages that: the shape and the size of the secondary lining of the tunnel at the overexcavation section of the utility model are the same as those of the secondary lining of the tunnel at the normal passing section, so that the sudden expansion or reduction of the section does not exist on the ventilation, the secondary lining does not need to be designed independently or a new template trolley is used, and the defect of the existing 'overexcavation design' is well overcome; the fault resistance can allow the stratums at two sides of the fault to generate larger dislocation and does not generate excessive influence on the secondary lining of the overexcavation section tunnel, thereby protecting the secondary lining of the overexcavation section tunnel from being damaged and ensuring the elevation, smoothness and the like of the track laid in the secondary lining of the overexcavation section tunnel.
Drawings
Fig. 1 is a schematic diagram of the double-layer fracture-resistant structure of the tunnel penetrating through the creep fault of the present invention.
In the figure: 1-hanging wall rock on the fault; 2-fault footwall surrounding rock; 3-creep fracture layer surface; 4-tunnel contour line after overexcavation; 5-outer layer fault resistance; 6-primary support; 7-inner layer fault resistance; 8-secondary lining of the tunnel at the overexcavation section; and 9-normally passing the secondary lining of the section tunnel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. As shown in fig. 1, the double-layer anti-fracture structure for the tunnel passing through the creeping fault is characterized by comprising an overexcavation section arranged at the creeping fault, an outer layer anti-fracture layer 5 with the total thickness equivalent to the overexcavation size, an initial support 6 and an inner layer anti-fracture layer 7; the outer layer fault-resistant layer 5 is made of a tough material and is tightly attached to the tunnel overexcavation contour line 4; the primary support 6 is a flexible hinged support and is arranged on the inner side of the outer anti-fault layer 5; the inner layer fracture-resistant layer 7 is also made of a tough material and is arranged on the inner side of the primary support 6; the secondary lining 8 of the tunnel of the overexcavation section is arranged at the inner side of the inner layer anti-fault 7, and the shape and the size of the secondary lining are the same as those of the secondary lining 9 of the tunnel of the normal passing section at two ends of the overexcavation section and are longitudinally connected.
Because the shape and the size of the secondary lining 8 of the overexcavation section tunnel are the same as those of the secondary lining 9 of the normal passing section tunnel, the sudden expansion or reduction of the section does not exist in ventilation, and the secondary lining does not need to be designed independently or a new template trolley does not need to be used. The defect of the existing 'over-excavation design' is well overcome.
The thickness of the outer anti-fault layer 5 should be smaller than that of the inner anti-fault layer 7, and meanwhile, a material with a small elastic modulus and good toughness should be selected, and the elastic modulus of the material selected in the embodiment is 0.5-5 Mpa. The thickness of the outer layer anti-fault layer 5 is smaller than that of the inner layer anti-fault layer 7, and the outer layer anti-fault layer 5 is smaller in thickness, so that the primary support 6 can conveniently and quickly play a role in maintaining the stability of the surrounding rock. When the creep fracture is dislocated, the outer layer anti-fracture 5 is first compressed. The outer layer fracture-resistant layer 5 has a small elastic modulus, so that the outer layer fracture-resistant layer can bear a certain pressure and is subjected to compression deformation to form a buffer layer between the surrounding rock and the primary support 6. If the fault dislocation continues to develop, when the deformation of the outer layer anti-fault layer 5 is larger, the primary support 6 can bear larger pressure, and at the moment, the pressure of the formation creep and dislocation is transmitted to the inner layer anti-fault layer 7 between the primary support 6 and the overexcavation section tunnel secondary lining 8. The properties of the inner layer anti-fault 7 are similar to those of the outer layer anti-fault 5, and the elastic modulus is smaller and the toughness is better, so that larger deformation can be allowed to be generated and the secondary lining 8 of the tunnel of the overexcavation section is not greatly influenced. Thereby protecting the secondary lining 8 of the overexcavation section tunnel from being damaged and ensuring the elevation, the smoothness and the like of the track laid in the secondary lining 8 of the overexcavation section tunnel.
The utility model discloses pass through double-deck anti fault layer construction method of creep fault tunnel, including following step:
step 1: performing overbreak on the tunnel which passes through the creep fracture and is within the length of the seismic fortification section;
step 2: applying an outer anti-fault layer 5 tightly attached to the overexcavation contour line 4 in the tunnel clearance of the overexcavation section;
and step 3: constructing a primary support 6 on the outer anti-fault layer 5;
and 4, step 4: constructing an inner-layer anti-fault layer 7 on the primary support 6, wherein the total thickness of the outer-layer anti-fault layer 5, the primary support 6 and the inner-layer anti-fault layer 7 is equal to the overexcavation size;
and 5: and building an overexcavation section tunnel secondary lining 8 in the inner-layer anti-fault 7 by using the same template trolley as the normal passing section tunnel secondary lining 9.
Claims (3)
1. A double-layer anti-fracture layer structure of a tunnel passing through a creeping fault is characterized by comprising an overexcavation section arranged at the creeping fault, an outer layer anti-fracture layer (5), a primary support (6) and an inner layer anti-fracture layer (7), wherein the total thickness of the outer layer anti-fracture layer is equal to the overexcavation size; the outer layer fault-resistant layer (5) is made of a tough material and is tightly attached to the tunnel overexcavation contour line (4); the primary support (6) is a flexible hinged support and is arranged on the inner side of the outer anti-fault layer (5); the inner layer anti-fault (7) is also made of a tough material and is arranged on the inner side of the primary support (6); the secondary lining (8) of the tunnel at the over-digging section is arranged on the inner side of the inner anti-fault layer (7), and the shape and the size of the secondary lining are the same as those of the secondary lining (9) of the tunnel at the normal passing section at two ends of the over-digging section.
2. The double-layer fault-resistant structure for a creeping fault tunnel according to claim 1, wherein the outer layer fault-resistant layer (5) has a smaller thickness than the inner layer fault-resistant layer (7).
3. The double-layer fault-resistant structure for the creeping fault tunnel according to claim 1, wherein the elastic modulus of the outer layer fault-resistant layer (5) and the inner layer fault-resistant layer (7) is 0.5-5 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921241263.6U CN210422632U (en) | 2019-08-02 | 2019-08-02 | Double-layer anti-fault structure for tunnel penetrating through creeping fault |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921241263.6U CN210422632U (en) | 2019-08-02 | 2019-08-02 | Double-layer anti-fault structure for tunnel penetrating through creeping fault |
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| CN210422632U true CN210422632U (en) | 2020-04-28 |
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| CN201921241263.6U Expired - Fee Related CN210422632U (en) | 2019-08-02 | 2019-08-02 | Double-layer anti-fault structure for tunnel penetrating through creeping fault |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374628A (en) * | 2019-08-02 | 2019-10-25 | 西南交通大学 | One kind passing through the double-deck anti-fault structure in creep faults tunnel and construction method |
| CN112096418A (en) * | 2020-10-10 | 2020-12-18 | 中国科学院武汉岩土力学研究所 | Shock-absorbing structure and tunnel lining structure of crossing active fault tunnel |
| CN116006213A (en) * | 2023-01-10 | 2023-04-25 | 广州大学 | Shock insulation structure of shield tunnel and construction method |
-
2019
- 2019-08-02 CN CN201921241263.6U patent/CN210422632U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374628A (en) * | 2019-08-02 | 2019-10-25 | 西南交通大学 | One kind passing through the double-deck anti-fault structure in creep faults tunnel and construction method |
| CN110374628B (en) * | 2019-08-02 | 2024-05-31 | 西南交通大学 | Double-layer anti-fault structure of tunnel penetrating through creeping fault and construction method |
| CN112096418A (en) * | 2020-10-10 | 2020-12-18 | 中国科学院武汉岩土力学研究所 | Shock-absorbing structure and tunnel lining structure of crossing active fault tunnel |
| 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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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200428 Termination date: 20210802 |