CN110043278A - A kind of anti-type mountain tunnel structure and its construction method of breaking of classification for passing through active breaking belt - Google Patents

A kind of anti-type mountain tunnel structure and its construction method of breaking of classification for passing through active breaking belt Download PDF

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Publication number
CN110043278A
CN110043278A CN201910292357.4A CN201910292357A CN110043278A CN 110043278 A CN110043278 A CN 110043278A CN 201910292357 A CN201910292357 A CN 201910292357A CN 110043278 A CN110043278 A CN 110043278A
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tunnel
layer
prefabricated
classification
passing
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CN110043278B (en
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杜修力
汪振
赵密
钟紫蓝
赵旭
黄景琦
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Beijing University of Technology
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Beijing University of Technology
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/003Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/08Lining with building materials with preformed concrete slabs
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining 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
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14Lining predominantly with metal
    • E21D11/18Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
    • E21D11/20Special cross- sections, e.g. corrugated
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/38Waterproofing; Heat insulating; Soundproofing; Electric insulating

Abstract

The invention discloses a kind of anti-disconnected type mountain tunnel structure of classification for passing through active breaking belt and its construction method, which includes outer lining, outer waterproofing layer, two linings of deformation layer, hollow corrugation steel pipe layer and assembly.Filled and process concrete in deformation layer;For hollow corrugation steel pipe layer by outwardly and inwardly corrugated steel tube by reversely docking, internal corrugated steel tube is pasted with waterproof geotextiles.Waterproof geotextiles are in W type lit-par-lit structure in valley regions;It assembles two linings and is spliced by prefabricated two bushing pipes piece along tunnel circumferential direction and axially, prefabricated two bushing pipes piece includes plastic concrete layer, high-strength concrete layer and corrugated steel tube, high-strength concrete layer is circumferentially spliced into high-strength concrete ring and is connected along tunnel axially through straight bolt by bolt with one end bent back, and corrugated steel tube is connected by screw bolts or is welded entirety.The structure can be realized the waterproof in tunnel and the target of setting up defences of anti-confining pressure and tunnel structure " mistake is not bad, and middle mistake can repair, and serious mistake is continuous " after fault movement.

Description

A kind of classification for passing through active breaking belt anti-break type mountain tunnel structure and its construction Method
Technical field
The present invention relates to a kind of tunnel (hole) structure, the anti-disconnected type mountain ridge tunnel of specially a kind of classification for passing through active breaking belt Road structure and its construction method.
Background technique
With the implementation of China's strategy to develop western regions, infrastructure is continued to develop, and large quantities of Important Projects are on western ground Area's construction, including public at Lan Tielu, Lan Yu Railway, Sichuan-Tibet railway, Yunnan-Qingzhang railway, the middle regions of the Yunnan Province diversion works and Sichuan-Tibet high speed Road etc..Underground rock is the critical structures of western Important Project, major long tunnel (hole) therein be highway, railway and The control engineering of water diversion project.Major long tunnel positioned at west area crosses over different landforms geologic elements, and is difficult to avoid that ground Intersect with multiple active breaking belts.Such as pass through 6 active breaking belts at river section at blue railway, prediction dislocation amount 80cm with On;The middle regions of the Yunnan Province diversion works intersects with 16 active breaking belts;Intersect to Linzhi's section with 5 discordogenic faults in Sichuan-Tibet railway Changdu.
The changing of the relative positions (including sticking cunning and creep) of active breaking belt, which would generally generate the safety in tunnel, to be seriously threatened, main table It is now three aspects: first is that the destruction of tunnel water proofing;Second is that the destruction of tunnel structure;Third is that the destruction of fault region rock mass. 1978 island Nian Yidouwei earthquake semilate rice take railway tunnel vault concrete scaling at Cross-fault leveling, largely collapse after surrounding rock failure into tunnel Road;The hilllock Chi-Chi Earthquake Zhong Shi dam water-conveyance tunnel is influenced by fault movement and failure by shear occurs within 1999;Wenchuan in 2008 Earthquake centre LongXi tunnel across F8 near Faults country rock and tunnel collapse jointly.
It makes a general survey of at present both at home and abroad to the fortification measure in Cross-fault leveling tunnel Practical Project, can be summarized as " design of backbreaking ", " hinged design " and " isolation energy dissipating design ", or the combination of the above three classes measure.And the above three classes measure all have it is stronger Limitation." design of backbreaking " and " isolation energy dissipating design " is limited to economy, is not suitable for passing through large-scale activity fracture zone The tunnel structure in domain.Lining cutting segment junction is weak link in " hinged design ", its destruction can not under big fault movement It avoids, is easy to generate the even new landslide of faulting of slab ends in lining cutting segment junction.In addition, lining cutting segmental length is influenced by lining trolley Usually 6~12m, the uncertainty of its plane of fracture position when due to fault movements, tunnel when lining cutting segmental length is too long Main structure may still be destroyed.In addition, the above three classes measure only single destruction for considering to reduce tunnel structure, and have ignored Tunnel cracking, chip off-falling or even the fall damage that wall rock destabilization may cause after the integral waterproofing and the changing of the relative positions in tunnel.
Summary of the invention
In view of the above technical problems, the present invention provides a kind of anti-disconnected type mountain tunnel knots of classification for passing through active breaking belt Structure and its construction method, the anti-disconnected type tunnel structure of the classification can realize different mesh of setting up defences to different magnitude of fault movement Mark, and guarantee the resistance confining pressure ability of the waterproofness and structure in tunnel after fault movement.It can using the tunnel that this method is built The creep changing of the relative positions and glutinous slide suitable for bearing different type tomography (normal fault, reversed fault and strike-slip fault) is dynamic.
A kind of anti-disconnected type mountain tunnel structure of classification that passing through active breaking belt, including the outer lining set gradually from outside to inside Layer, outer waterproofing layer, two linings of deformation layer, hollow corrugation steel pipe layer and assembly.
Foam concrete is filled in deformation layer.Hollow corrugation steel pipe layer is adopted by outer corrugations steel pipe and internal corrugated steel tube It is formed by connecting with reversed docking mode.Waterproof geotextiles are pasted on internal corrugated steel tube surface, waterproof geotextiles are in trough In the lit-par-lit structure of W type.
It assembles two linings and is spliced by prefabricated two bushing pipes piece along tunnel circumferential direction and axially.Prefabricated two bushing pipes piece is along tunnel axis To using fissure of displacement connecting method.It is mixed that prefabricated two bushing pipes piece is followed successively by plastic concrete layer, high-strength concrete layer, plasticity from outside to inside Solidifying soil layer and corrugated steel tube.Prefabricated two bushing pipes piece is being laid with prepared screw-bolt hole with left and right up and down.By upper and lower prepared screw-bolt hole, Bolt with one end bent back is laid in high-strength concrete layer, high-strength concrete layer is circumferentially spliced into entirety, and will be adjacent high-strength Concrete ring is by the straight bolt in the prepared screw-bolt hole of left and right along tunnel axial series.Corrugated steel in contiguous prefabricated two bushing pipes piece Pipe is circumferentially and tunnel is axially connected by screw bolts or is welded entirety.
Working mechanism of the invention is:
The anti-disconnected type mountain tunnel structure of the above-mentioned classification for passing through active breaking belt is passing through active breaking belt region by outside extremely Inside it is followed successively by outer lining, outer waterproofing layer, two linings of deformation layer, hollow corrugation steel pipe layer and assembly.
Under static(al) state, prevents the water flow in rock mass from penetrating into tunnel internal by outer waterproofing layer, reach static(al) state The waterproof purpose in lower tunnel.
After the changing of the relative positions occurs for tomography, tunnel structure " mistake is not bad, and middle mistake can repair, and serious mistake is continuous " is realized by multistage measure Target of setting up defences.
Under tomography mistake momentum (0~0.2m), the modified difference between country rock and lining cutting passes through foam concrete in deformation layer Conquassation is to offset.The outer waterproofing layer partial region of tunnel structure generates gap and damages, and water flow a part of infiltration is in The valley regions of empty corrugated steel tube layer flow into tunnel bottom, are discharged by pumping equipment, remainder then passes through its inner wall and attaches Waterproof geotextiles prevent its enter tunnel internal, it is ensured that the waterproof performance in tunnel.Tunnel can maintain just after the small changing of the relative positions of tomography Often operation is without repairing.
Under the medium changing of the relative positions amount of tomography (0.2m~2.0m), outer lining is seriously damaged, and loses the ability for bearing pressure from surrounding rock. Foam concrete is crushed completely in deformation layer.Hollow corrugation steel pipe layer with fault movement generate stretch, compression or it is shear-deformable.Dress Compressive deformation is generated with the plastic concrete in two linings, most inner side corrugated steel tube is influenced to generate by fault movement to be stretched, compression Or it is shear-deformable.The good retractility of ripple is benefited from, the corrugated steel tube assembled in two linings is in normal deformation stage.Dress It is circumferentially entirety with the high-strength concrete in two linings, adjacent high-strength concrete interannular is generated due to the straight bolt deformation of connector Along a small amount of differential displacement of offset direction.At this point, country rock can be by hollow corrugation steel pipe layer, two linings of assembly to the pressure in tunnel High-strength concrete ring and corrugated steel tube undertake.It assembles two linings to damage after fault movement, but can guarantee the positive normal open in tunnel Row, and can repair.Fabricated form of construction work can guarantee that the section of jurisdiction being damaged is replaced in time, improve the remediation efficiency in tunnel. Tunnel outer waterproofing layer destroys completely, but the lit-par-lit structure of the waterproof geotextiles W type of hollow corrugation steel pipe layer inner surface attaching mentions Geometry elongate space has been supplied, has thereby guaranteed that waterproofness of the tunnel after fault movement.
Under tomography serious mistake momentum (2.0m~5.0m), in outer lining, deformation layer in two linings of foam concrete and assembly Plastic concrete be crushed.The stretching due to caused by fault movement of hollow corrugation steel pipe layer, compression or shear action and Partial destruction.The corrugated steel tube assembled in two linings becomes since fault movement causes steel to generate plasticity beyond its yield strength Shape, but it still keeps the integrality of structure.It is whole for assembling the high-strength concrete in two linings circumferentially, but can be because of adjacent height Reinforced concrete interannular track bolt destroys and generates the differential displacement along offset direction.In the most inner side of lining cutting, corrugated steel tube Deformation can guarantee that assembling two linings destroys along the continuous modification in fault movement direction without apparent faulting of slab ends etc..Country rock The pressure in tunnel is undertaken by assembling the high-strength concrete ring and deformed corrugated steel tube that are axially distributed in two linings along tunnel. Liner structure seriously damages at this time, but not the envelope hole that collapses occurs, and guarantees traffic capacity when emergency relief.
Compared with prior art, advantages of the present invention is as follows:
(1) present invention devises a kind of anti-disconnected type mountain tunnel structure of the classification for passing through active breaking belt, anti-by multistage Disconnected measure, realize tunnel structure after the changing of the relative positions occurs for tomography " mistake is not bad, and middle mistake can repair, and serious mistake is continuous " target of setting up defences.This Outside, since using two lining structures are assembled, the length of setting up defences in tunnel can also be adjusted according to active breaking belt length-flexible.
(2) passing through hollow corrugation steel pipe layer, the high-strength concrete ring in two linings of assembly and corrugated steel tube can successfully manage Lead to the pressure from surrounding rock for acting on two lining structures since outer lining destroys after fault movement, to promote the peace of entire tunnel structure Quan Xing.
(3) lit-par-lit structure for being attached at the waterproof geotextiles W type of hollow corrugation steel pipe layer inner surface provides geometry elongation Space thereby guarantees that waterproofness of the tunnel after fault movement.
Detailed description of the invention
Fig. 1 is to pass through the anti-disconnected type mountain tunnel structural schematic diagram of active breaking belt classification;
Fig. 2 is sectional view of the tunnel structure along the direction I-I;
Fig. 3 is hollow corrugation steel pipe layer schematic diagram;
Fig. 4 is hollow corrugation steel pipe layer deformed in tension schematic diagram;
Fig. 5 is hollow corrugation steel pipe layer compressive deformation schematic diagram;
Fig. 6 is that hollow corrugation steel pipe layer drains schematic diagram;
Fig. 7 is that contiguous prefabricated two bushing pipes piece splices schematic diagram;
Fig. 8 is prefabricated two bushing pipes piece schematic diagram;
Fig. 9 is that prefabricated two bushing pipes piece circumferentially splices schematic diagram;
Figure 10 is high-strength concrete ring schematic diagram.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1, a kind of anti-disconnected type mountain tunnel structure of the classification for passing through active breaking belt is present embodiments provided, The tunnel structure is made of outer lining 1, outer waterproofing layer 2, deformation layer 3, hollow corrugation steel pipe layer 4 and two linings 5 of assembly.
In the present embodiment, referring to figs. 1 to Fig. 5, outer lining 1 uses gunite concrete, and deformation layer 3 uses foam coagulation Soil.Hollow corrugation steel pipe layer 4 is formed by connecting by outer corrugations steel pipe 6 and internal corrugated steel tube 7 by reversed docking mode.It compares Two aspects are embodied in the advantages of corrugated steel tube of arrangement single layer, the reversed docking mode: first is that in state tension or in compression Under, deformation occurs to be formed by hollow space in docking, refering to schematic diagram 4 and Fig. 5, therefore, even if there is broken external rock mass Or outer lining enters valley regions, will not hinder its Free Transform;Second is that docking is formed by honeycomb-shaped structure, can support Imperial pressure from surrounding rock promotes the safety of tunnel entirety so as to improve the stress of two linings 5 of assembly.
The thickness of deformation layer 3 is taken as 10cm~20cm, meets the needs of tomography mistake momentum.
For corrugated steel tube in hollow corrugation steel pipe layer by prefabrication, sectionally smooth join can be adapted for various cross sections The tunnel structure of pattern.Only illustrate by taking circular tunnel as an example in the present invention.The assembly of corrugated steel tube and other related requests can join According to GB/T 34567-2017 clod wash corrugated steel tube.
In the present embodiment, referring to Fig. 3, internal 7 surface of corrugated steel tube is pasted with waterproof geotextiles 8.Waterproof geotextiles 8 exist Valley regions are in the lit-par-lit structure of W type, have the geometry elongation characteristics in fault movement.The lit-par-lit structure height of W type with it is interior The wave height of portion's corrugated steel tube 7 is identical.
In general, the catalase of the passed through fault region in tunnel, hydrogeologic condition are poor.Static(al) before fault movement Under state, outer waterproofing layer 2 prevents the water flow in rock mass from penetrating into tunnel internal, reaches the waterproof purpose in tunnel under static(al) state. After fault movement, outer waterproofing layer 2 can be destroyed since fault movement generates gap, and water flow a part of infiltration is in The valley regions of empty corrugated steel tube layer 4 flow into tunnel bottom, are discharged by pumping equipment, refering to Fig. 6.In remainder then passes through The waterproof geotextiles 8 that corrugated steel tube 7 surface in portion's attaches prevent it from entering tunnel internal.
In the present embodiment, referring to Fig. 7, two linings 5 of assembly are spliced by prefabricated two bushing pipes piece 9.Prefabricated two bushing pipes piece 9 By up and down and in the laid prepared screw-bolt hole 10 in left and right bolt with one end bent back 11 and straight bolt 12 circumferentially with axial connection For entirety.
In the present embodiment, referring to Fig. 8, prefabricated two bushing pipes piece 9 is followed successively by plastic concrete layer 13-1, high-strength from outside to inside Concrete layer 14, plastic concrete layer 13-2 and corrugated steel tube 15.
Prefabricated two bushing pipes piece, 9 thickness is identical as common section tunnel double-lining thickness, and the width along tunnel axial direction takes 40~80cm, While guaranteeing two 5 stability of lining of assembly, segment will not make high-strength concrete layer therein 14 in tomography because width is excessive Local damage is generated under the changing of the relative positions.
14 thickness of high-strength concrete layer takes the 1/3 of prefabricated two bushing pipes piece, 9 thickness, and between 20~30cm.
The strength grade of high-strength concrete layer 14, (according to specification GB 50010-2010), is meeting between C50~C70 While anti-confining pressure, construction economy is taken into account.
Under fault movement, in deformation layer after the conquassation of plastic concrete layer 13-1 and 13-2 in prefabricated two bushing pipes piece 9 In foam concrete.
In the present embodiment, referring to Fig. 9 to Figure 10, bolt with one end bent back 11 is only laid in high-strength concrete layer 14.It is high-strength mixed Solidifying soil layer 14 is circumferentially connected to become high-strength concrete ring 16 by bolt with one end bent back 11, to act on dress after undertaking fault movement Pressure from surrounding rock with two linings 5.Adjacent high-strength concrete ring 16 is by straight bolt 12 using fissure of displacement connecting method along tunnel axial direction Series connection is whole.Corrugated steel tube 15 in contiguous prefabricated two bushing pipes piece 9 is circumferentially and longitudinal direction is connected by screw bolts or is welded Whole, junction intensity should ensure that under fault movement to be not in damage.
A kind of construction method of the anti-disconnected type mountain tunnel structure of classification that passing through active breaking belt, comprising the following steps:
(1) active breaking belt region is being passed through, tunnel structure is backbreak first.The tunnel amount of backbreaking is hollow corrugation steel pipe Layer 4 and 3 thickness of deformation layer, tunnel range L of backbreaking determine as the following formula:
L=w+15 × 2 (unit: m)
In formula, w is fault disruption zone bandwidth;15m is the length of setting up defences in tunnel in the outer upper lower burrs rock mass of fault belt.
(2) outer lining 1 is applied using gunite concrete.After outer 1 intensity of lining reaches prescribed requirement, outsourcing waterproof is carried out The construction of layer 2.After the construction of outer waterproofing layer 2 is completed, template is set up by trolley, pours foam concrete, it is to be achieved strong After degree, demoulding.
(3) corrugated steel tube that is prefabricated in the factory is transported to construction site.Scene should first check for corrugated steel tube It is no to have damage or deformation.Before installation, anti-corrosion treatment is carried out to structure first.After the completion of deformation layer 3 is constructed, corrugated steel is carried out The pipe shaft of pipe is installed.When installation first since encircleing bottom, then side is arrived, finally arrives vault, it is symmetrical assembled.Pipe shaft connects one week entirety Axially spliced along tunnel again after molding.In the installation process of hollow corrugation steel pipe layer 4, need simultaneously to external corrugated steel Area of coming to nothing between pipe 6 and deformation layer 3 carries out injecting treatment.To edge joint position after the completion of hollow corrugation steel pipe layer 4 is all assembled Being sealed using sealant prevents from revealing.
(5) prefabricated two bushing pipes piece 9 is carried out by different tunnel cross-section forms prefabricated in the factory, is then transported to construction site It is assembled.It is axially extending to side and tunnel the prefabricated assembled bottom by arch of two bushing pipes piece 9, along tunnel circumferential direction and tunnel axis To assembly carry out simultaneously.In assembly two linings, 5 work progress, need simultaneously to prefabricated two bushing pipes piece 9 and internal corrugated steel Area of coming to nothing between pipe 7 carries out injecting treatment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. A variety of modifications of embodiment will be readily apparent to those skilled in the art, it is as defined herein general Principle can be realized in other embodiments without departing from the spirit or scope of the present invention, not be described in detail Part, be the prior art, herein without repeating.Therefore, the present invention is not intended to be limited to these implementations shown in this article Example, and it is to fit to the widest scope consistent with principles disclosed herein and feature.

Claims (10)

1. a kind of anti-disconnected type mountain tunnel structure of classification for passing through active breaking belt, it is characterised in that: including from outside to inside successively Outer lining, outer waterproofing layer, two linings of deformation layer, hollow corrugation steel pipe layer and assembly being arranged;
Foam concrete is filled in the deformation layer;The hollow corrugation steel pipe layer is by outer corrugations steel pipe and internal corrugated steel Pipe is formed by connecting using reversed docking mode;Two linings of the assembly by prefabricated two bushing pipes piece along tunnel is circumferential and axial splicing and At wherein axially adjacent section of jurisdiction uses fissure of displacement connecting method.
2. the anti-disconnected type mountain tunnel structure of a kind of classification for passing through active breaking belt according to claim 1, it is characterised in that: Internal ripple steel tube surface is pasted with waterproof geotextiles, and waterproof geotextiles are in the lit-par-lit structure of W type, the stacking of W type in trough Structure height is identical as the internal wave height of corrugated steel tube.
3. the anti-disconnected type mountain tunnel structure of a kind of classification for passing through active breaking belt according to claim 1, it is characterised in that: The thickness of the deformation layer is taken as 10cm~20cm.
4. the anti-disconnected type mountain tunnel structure of a kind of classification for passing through active breaking belt according to claim 1, it is characterised in that: The prefabricated two bushing pipes piece is followed successively by plastic concrete layer, high-strength concrete layer, plastic concrete layer and corrugated steel from outside to inside Pipe;The strength grade of high-strength concrete layer is between C50~C70.
5. the anti-disconnected type mountain tunnel structure of a kind of classification for passing through active breaking belt according to claim 4, it is characterised in that: The prefabricated two bushing pipes piece is being laid with prepared screw-bolt hole with left and right up and down.
6. the anti-disconnected type mountain tunnel structure of a kind of classification for passing through active breaking belt according to claim 5, it is characterised in that: Bolt with one end bent back in the prepared screw-bolt hole up and down is only laid in high-strength concrete layer, is connected as high-strength concrete Ring;High-strength concrete ring is whole along tunnel axial series by bolt straight in the prepared screw-bolt hole of left and right.
7. the anti-disconnected type mountain tunnel structure of a kind of classification for passing through active breaking belt according to claim 4, it is characterised in that: The high-strength concrete thickness degree takes the 1/3 of prefabricated two bushing pipes piece thickness, and between 20~30cm.
8. the anti-disconnected type mountain tunnel structure of a kind of classification for passing through active breaking belt according to claim 1, it is characterised in that: The prefabricated two bushing pipes piece thickness is identical as common section tunnel double-lining thickness, and the width along tunnel axial direction takes 40~80cm.
9. the anti-disconnected type mountain tunnel structure of a kind of classification for passing through active breaking belt according to claim 1, it is characterised in that: The length of setting up defences in tunnel determines as the following formula:
L=w+15 × 2, unit m;
In formula, w is fault disruption zone bandwidth;15m is the length of setting up defences in tunnel in the outer upper lower burrs rock mass of fault belt.
10. a kind of construction method for the anti-disconnected type mountain tunnel structure of classification for passing through active breaking belt as described in claim 1, Characterized by the following steps:
(1) active breaking belt region is being passed through, tunnel structure is backbreak first;The tunnel amount of backbreaking be hollow corrugation steel pipe layer and Deformation layer thickness, tunnel range L of backbreaking determine as the following formula:
L=w+15 × 2, unit m;
In formula, w is fault disruption zone bandwidth;15m is the length of setting up defences in tunnel in the outer upper lower burrs rock mass of fault belt;
(2) outer lining is applied using gunite concrete;After outer lining intensity reaches requirement, the construction of outer waterproofing layer is carried out; After outer waterproofing layer construction is completed, template is set up by trolley, pours foam concrete, after intensity to be achieved, demoulding;
(3) corrugated steel tube that is prefabricated in the factory is transported to construction site;Scene should first check for whether corrugated steel tube has in transit Damage or deformation;Before installation, anti-corrosion treatment is carried out to structure first;After the completion of deformation layer construction, corrugated steel tube is carried out Pipe shaft installation;When installation first since encircleing bottom, then side is arrived, finally arrives vault, it is symmetrical assembled;Pipe shaft connection one week integrally formed Axially spliced along tunnel again afterwards;In the installation process of hollow corrugation steel pipe layer, need simultaneously to external corrugated steel tube with Area of coming to nothing between deformation layer carries out injecting treatment;To edge joint position using sealing after the completion of hollow corrugation steel pipe layer is all assembled Glue, which is sealed, to be prevented from revealing;
(5) prefabricated two bushing pipes piece carries out prefabricated in factory, is then transported to construction site and is assembled;It is prefabricated two lining pipe sheet assembling by Arch bottom starts, axially extending to side and tunnel, and the assembly axial along tunnel circumferential direction and tunnel carries out simultaneously;Assembling two linings In work progress, need to carry out injecting treatment to the area of coming to nothing between prefabricated two bushing pipes piece and internal corrugated steel tube simultaneously.
CN201910292357.4A 2019-04-12 2019-04-12 Hierarchical fracture-resistant mountain tunnel structure penetrating through movable fracture zone and construction method thereof Active CN110043278B (en)

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