CN106522977B - Pass through active fault tunnel multi-stage shock-absorbing structure - Google Patents

Pass through active fault tunnel multi-stage shock-absorbing structure Download PDF

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Publication number
CN106522977B
CN106522977B CN201610949404.4A CN201610949404A CN106522977B CN 106522977 B CN106522977 B CN 106522977B CN 201610949404 A CN201610949404 A CN 201610949404A CN 106522977 B CN106522977 B CN 106522977B
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tunnel
absorbing
fault
layer
stage shock
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CN106522977A (en
Inventor
高波
周裕
王帅帅
吴冬
徐旭炜
王英学
申玉生
周佳媚
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Southwest Jiaotong University
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Southwest Jiaotong University
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/14Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
    • 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
    • E21D11/38Waterproofing; Heat insulating; Soundproofing; Electric insulating

Abstract

The present invention discloses one kind and passes through active fault tunnel multi-stage shock-absorbing structure, and the tunnel cross section of the main deformed area of the fault belt in tunnel is greater than the tunnel cross sectional of stable section;Tunnel-liner layer is longitudinal varistructure: tunnel-liner layer is segmentation lining cutting, and the absorbing joint constituted between adjacent lining cutting section is connected by flexible joint;Surrounding rock consolidation circle is set by way of grouting and reinforcing in the fault belt and its coverage, filled with the deformation adjustment layer being made of lightweight sand between the surrounding rock consolidation circle inner wall and tunnel-liner layer.The present invention can make the safety of tunnel structure and the stability of country rock that can be largely increased;The maximum and minimum principal stress peak value at each position of lining cutting is substantially reduced, and makes to be likely to occur being substantially reduced for the tunnel section destroyed because tension or in compression;It after at the changing of the relative positions face changing of the relative positions occurs for liner structure, can prevent a wide range of unstability of country rock from collapsing, reduce influence of the fault movement to tunnel.

Description

Pass through active fault tunnel multi-stage shock-absorbing structure
Technical field
The present invention relates to technical field of tunnel construction, specially pass through active fault tunnel multi-stage shock-absorbing structure.
Background technique
As a kind of engineering structure for being built in underground, stress and deformation are closely related with surrounding formation, existing in tunnel Earthquake is investigated it has been shown that in high intensity Zone, and tunnel may be by serious earthquake.Especially for passing through active fault There is lining in the tunnel of crushed zone, the effect in strong earthquakes by fault disruption zone rock mass pressure and the active fault changing of the relative positions, tunnel Cracking, dislocation, the Earthquake damages even integrally to collapse are built, such as the serious sub- tunnel of dragon's cave-stalactite cave disaster-stricken in Wenchuan earthquake.In strong earthquakes When dynamic generation, the dislocation amount of active fault may increase to several meters of range by several centimetres, and for using conventional structure form Tunnel structure during fault movement, will directly bear tomography upper lower burrs with respect to shearing, and squeeze or pull caused by the changing of the relative positions Effect, to seriously be destroyed.Currently, the tunnel of active fault crushed zone is passed through for high intensity Zone, it is general to use Longitudinal varistructure digs two kinds of measures of structure with lateral.
Longitudinal varistructure is mainly by reducing disconnected along the longitudinally disposed a certain number of flexible joints in tunnel or absorbing joint Layer causes tunnel Axinlly nonuniform to deform, and the adaptive deformability in tunnel is improved, so that reducing fault movement acts on tunnel axis To shearing and squeezing action power, but it is arranged at flexible joint and absorbing joint in tunnel and is likely to occur partial cut, extruding and stretching It destroys, is on the one hand difficult to ensure tunnel water proofing function, on the other hand when tomography passes through large-scale fault belt, longitudinal variable knot Structure is difficult to provide enough tunnel total bearing capacities.
Structure is laterally digged mainly by digging in fault movement section tunnel using cross section, is reserved fault movement amount, is inhaled Fault movement displacement is received, but section digs and increases construction economy cost, while also weakening country rock from bearing capacity, broken in activity Layer shearing under squeezing action, may cause crushed zone Instability of Rock Body, lead to the unbearable crushed zone Instability of Rock Body pressure in tunnel and Generate the serious earthquake such as total collapse and water burst.
As application study of the buffer layer structure in structure shock resisting is more and more, part experts and scholars are directed to and pass through work Tomography tunnel shock-absorbing layer structure has carried out research.Under strong earthquake motion effect, damping floor shear stiffness is low, can reduce tunnel lining The shear action between country rock is built, tunnel internal force is effectively reduced, but for passing through active fault tunnel under strong earthquake motion effect, mainly It is acted on by fault movement and crushed zone Instability of Rock Body pressure, setting buffer layer is difficult to ensure tunnel bearing capacity, while big face Product implements buffer layer structure, is also faced with the problems such as difficulty of construction is big, long in time limit and at high cost.
The country, which also has, at present few in number passes through active fault Tunnel structure, but the single consideration of these structure types Flexible joint or absorbing joint design, while in first lining and secondary lining filled and process concrete buffer layer, and fail to fully consider Crushed zone wall rock destabilization pressure influence caused by fault movement, existing earthquake is it has been shown that wall rock destabilization pressure may cause tunnel Cracking, chip off-falling even fall damage occur for road;Simultaneously under fault movement effect, part can occur at flexible joint or absorbing joint It destroys, it is difficult to guarantee tunnel water proofing function.
Summary of the invention
It is able to solve regarding to the issue above the purpose of the present invention is to provide one kind and passes through active fault crushed zone tunnel and exist The activity of passing through for the problem of tunnel support structure cracking, leak and landslide occur under fault movement and breaking surrounding rock buckling pressure is disconnected Layer tunnel multi-stage shock-absorbing structure.Technical solution is as follows:
Active fault tunnel multi-stage shock-absorbing structure is passed through, the tunnel cross section of the main deformed area of the fault belt in tunnel is greater than The tunnel cross sectional of stable section;Tunnel-liner layer is longitudinal varistructure: tunnel-liner layer be to be segmented lining cutting, and adjacent lining cutting section Between the absorbing joint that constitutes pass through flexible joint and connect.
Further, surrounding rock consolidation is set by way of grouting and reinforcing in the fault belt and its coverage Circle.
Further, filled with the change being made of lightweight sand between the surrounding rock consolidation circle inner wall and tunnel-liner layer Shape adjustment layer.
Further, the surrounding rock consolidation circle and deformation adjustment interlayer also are provided with waterproof layer.
Further, the tunnel-liner layer includes the secondary lining of preliminary bracing He its inner wall, preliminary bracing and two Waterproof layer is additionally provided between secondary lining cutting.
Further, it is arranged at the absorbing joint of flexible joint and is additionally provided with connector local strengthening.
The beneficial effects of the present invention are: the present invention can make the safety of tunnel structure and the stability of country rock that can obtain It greatly improves;The maximum and minimum principal stress peak value at each position of lining cutting is substantially reduced, and makes to be likely to occur because tension or in compression and broken Bad tunnel section is substantially reduced;After at the changing of the relative positions face changing of the relative positions occurs for liner structure, displacement mutates at interface, hands over Steel bar stretching in the secondary lining of interface is surrendered, and the deformation on stratum can be preferably adapted to for structure relatively in the air, is prevented Only a wide range of unstability of country rock is collapsed, and reduces influence of the fault movement to tunnel, guarantees tunnel in the structure of " waterproof after first structure " Lower realization is open to traffic.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that the present invention passes through active fault tunnel multi-stage shock-absorbing structure.
Fig. 2 is lining cutting schematic diagram of a layer structure of the present invention.
Fig. 3 is across the active fault tunnel structure entirety sectional view of the present invention.
Fig. 4 is that tunnel cross-section of the present invention digs schematic diagram.
Fig. 5 is this practical new deformation adjustment layer mechanism of action schematic diagram
1- lower wall country rock;2- fault belt country rock;3- surrounding rock consolidation circle;4- deforms adjustment layer;5- preliminary bracing;6- bis- Secondary lining cutting;7- flexible joint;8- connector local strengthening;9- waterproof layer;The changing of the relative positions face 10-;11- longitudinal reinforcement;12- fault disruption zone Band;13- normal tunnel lining section;14- digs tunnel-liner section;A section tunnel-liner section is digged after the 15- changing of the relative positions;16- is wrong Slope surface after dynamic adjustment;17- deforms adjustment layer particle flow direction, and 18- comes to nothing bottom area.
Specific embodiment
The present invention is described in further details in the following with reference to the drawings and specific embodiments.As shown in Figure 1, the activity of passing through is disconnected Layer tunnel multi-stage shock-absorbing structure, the tunnel that the tunnel cross section of the main deformed area of fault belt 12 in tunnel is greater than stable section are transversal Face;Tunnel-liner layer is longitudinal varistructure: tunnel-liner layer is segmentation lining cutting, and the absorbing joint constituted between adjacent lining cutting section is logical Cross the connection of flexible joint 7.It is arranged at the absorbing joint of flexible joint 7 and is additionally provided with connector local strengthening 8, reinforces absorbing joint waterproofness Energy.
Tunnel-liner uses the form of longitudinal varistructure and carries out local strengthening, and longitudinal varistructure mainly includes segmentation Lining cutting and flexible joint, according to different stratum deformation amounts, in three Light deformation section, small deformation section and main deformation section section settings The length of different lining cutting segments, the length that its lining cutting segment is arranged in the tunnel-liner positioned at main deformation section are narrower than small deformation section Segmental length is segmented between lining cutting and flexible joint is arranged, and foam concrete can be used in flexible joint or rubber, polystyrene are hard The filling of matter plastic foam;Main transformer shape section under the influence of the changing of the relative positions is reserved disconnected using the cross-section for digging method enlarged configuration Fault momentum.
Surrounding rock consolidation circle is set by way of grouting and reinforcing in the fault belt 12 and its coverage of the present embodiment 3.Bearing capacity for the self-stable ability and ground that enhance country rock uses grouting and reinforcing in fault belt and its coverage Mode reinforce country rock and ground.Surrounding rock consolidation circle 3 allows for fault belt and interface, and nearby self is poor, Thus the active force acted on tunnel structure may be will increase, therefore use slip casting in fault belt and its coverage The mode of reinforcing reinforces country rock and ground, to enhance the self-stable ability of country rock and the bearing capacity of ground, prevents in tunnel structure There is a wide range of unstability collapsing in peripheral rock when destroying, while also can reduce the active force acted on structure.
Filled with the deformation tune being made of lightweight sand between 3 inner wall of surrounding rock consolidation circle and tunnel-liner layer of the present embodiment Flood 4.Deformation adjustment layer is by adjustment of deformation itself and the flowing of filler, and consumption absorbs the deformation being transmitted to and energy Amount, to reduce influence of the fault movement to tunnel.In the selection of deformation adjustment layer material, morphotropism, flowing are comprehensively considered Property and economy, choose using the mixing light sand that EPS particle, coarse sand, middle sand mix according to a certain percentage as Deform adjustment layer.The characteristics of mixing light sand are as follows: density is small, and inertia force is small;EPS particle deformability is strong, and modulus of shearing is low, The active force in lining cutting is acted on by reductions such as self-deformations;Coarse sand and middle sand good fluidity, and generate ball effect and make to mix Sand is closed to have preferable mobility, when occur occurring coming to nothing below tunnel under the changing of the relative positions area when, the dynamic filling of mixed sand soil flow is come to nothing Area, therefore the stratum deformation under different fault movement amounts can be better conformed to.
It is equipped with waterproof layer 9 between the surrounding rock consolidation circle 3 and deformation adjustment layer 4 of the present embodiment, tunnel-liner layer includes initial stage branch The secondary lining 6 of shield 5 and its inner wall, is additionally provided with waterproof layer, as shown in Figure 2 between preliminary bracing 5 and secondary lining 6.Multiple tracks Waterproof be pay attention to concrete self waterproofing and the waterproof at absorbing joint, deformation adjustment layer and surrounding rock consolidation circle between, just branch and The waterproof layer of waterproofing and anti-leakage is all set between secondary lining, waterproof is preferably achieved the purpose that using the fortification measure of multiple tracks.It is special Other, reinforcing the waterproof at absorbing joint can be used following measures such as: GINA waterstop method, detachable pipe sheet assembling double-layer structure method With BQXF(ripple reinforcing rubber composite material) anticracking water-stop method etc..
Such as Fig. 4, shown in Fig. 5, the changing of the relative positions occurs at interface for tomography, and mutation is subjected to displacement at interface, causes crushed zone Wall rock destabilization, the design use grouting reinforcement rock, improve country rock from bearing capacity, while compatibility of deformation layer can effectively adapt to Deformation and absorption energy, to realize the purpose of protection liner structure.Mixing light sand in compatibility of deformation layer is made in the changing of the relative positions Under the influence of, particle is flowed to the area 18 of coming to nothing of tunnel bottom, to adapt to stratum deformation.Liner structure is using segmentation lining cutting Form, improve longitudinal adaptive deformation ability, fault movement reduced by country rock and malformation (or changing of the relative positions of lining cutting) and is drawn The internal force for playing tunnel-liner avoids and possible at interface and crushed zone stress concentration phenomenon occurs.Being segmented lining cutting can also Make damage localization of the tunnel under fault movement, the total collapse of structure will not be caused.Laterally digs and can be protected after the changing of the relative positions Internal headroom is demonstrate,proved, using the forms such as backfill, pading plate to adjust the gradient can be open to traffic with Quick-return, when there are the accessory structures such as track When, it copes with it and is adjusted and repairs.

Claims (4)

1. passing through active fault tunnel multi-stage shock-absorbing structure, which is characterized in that fault belt (12) the main deformed area in tunnel Tunnel cross section is greater than the tunnel cross sectional of stable section;Tunnel-liner layer is longitudinal varistructure: tunnel-liner layer is segmentation lining It builds, and the absorbing joint constituted between adjacent lining cutting section is connected by flexible joint (7);
Surrounding rock consolidation circle (3) are set by way of grouting and reinforcing in the fault belt (12) and its coverage;
Filled with the deformation adjustment layer (4) being made of lightweight sand between surrounding rock consolidation circle (3) inner wall and tunnel-liner layer; Deformation adjustment layer (4) is the mixing light sand mixed by EPS particle, coarse sand, middle sand.
2. according to claim 1 pass through active fault tunnel multi-stage shock-absorbing structure, which is characterized in that the surrounding rock consolidation It encloses between (3) and deformation adjustment layer (4) and is equipped with waterproof layer (9).
3. according to claim 1 or 2 pass through active fault tunnel multi-stage shock-absorbing structure, which is characterized in that the tunnel Lining cutting layer includes preliminary bracing (5) and the secondary lining (6) of its inner wall, is also set up between preliminary bracing (5) and secondary lining (6) There is waterproof layer.
4. according to claim 1 pass through active fault tunnel multi-stage shock-absorbing structure, which is characterized in that setting flexible joint (7) connector local strengthening (8) are additionally provided at absorbing joint.
CN201610949404.4A 2016-10-26 2016-10-26 Pass through active fault tunnel multi-stage shock-absorbing structure Active CN106522977B (en)

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Families Citing this family (10)

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Publication number Priority date Publication date Assignee Title
CN107100631B (en) * 2017-05-12 2019-04-02 西南交通大学 Pass through the construction method of active fault Tunnel Second Lining
CN107255033A (en) * 2017-06-23 2017-10-17 乌鲁木齐城市轨道集团有限公司 The error resilience for passing through active fault moves the construction method of Tunnel Second Lining
CN107120125B (en) * 2017-06-29 2018-11-09 西南交通大学 A kind of tunnel antidetonation support system suitable for highlight lines area Cross-fault leveling
CN109252552B (en) * 2018-11-07 2019-08-09 中南大学 A kind of progressive rate Aseismatic Design method of underground structure
CN109989768B (en) * 2019-04-26 2020-07-31 山东大学 Lining structure suitable for tunnel crossing active fault and construction method thereof
CN110005444A (en) * 2019-05-05 2019-07-12 西南交通大学 Highly seismic region method for tunnel construction and tunnel support structure
CN110159314B (en) * 2019-05-07 2020-08-25 山东大学 Tunnel flexible ring type supporting system suitable for penetrating through movable fracture zone
CN110836120B (en) * 2019-11-07 2020-11-06 山东大学 Tunnel lining structure suitable for self-monitoring and adjusting of crossing active fault and construction method
CN110924976B (en) * 2019-12-03 2020-09-18 中南大学 Surrounding rock outer ring grouting reinforcement method
CN111706354A (en) * 2020-07-06 2020-09-25 四川农业大学 Frozen soil layer fracture zone tunnel shock-absorbing structure

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