CN108376205A - A kind of soft clay area overlapping shield tunnel System design method upper and lower over long distances - Google Patents
A kind of soft clay area overlapping shield tunnel System design method upper and lower over long distances Download PDFInfo
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- CN108376205A CN108376205A CN201810209955.6A CN201810209955A CN108376205A CN 108376205 A CN108376205 A CN 108376205A CN 201810209955 A CN201810209955 A CN 201810209955A CN 108376205 A CN108376205 A CN 108376205A
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- G—PHYSICS
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- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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Abstract
The invention discloses overlapping shield tunnel System design methods above and below a kind of long range of soft clay area, include the following steps：It determines overlapping tunnel sequence of construction, determine the optimal vertical clear distance D in hole up and down0And minimum vertical clear distance Dmin, after acquisition built tunnel to first built tunnel and surrounding formations affecting laws, formulate tunnel itself risk design scheme under the conditions of different clear distances.The present invention systematically proposes soft clay area long range overlapping shield tunnel design method up and down for the first time, provide vertical clear distance control value-acquiring method, for different clear distances design scheme is formulated according to its affecting laws, design for narrow underground space overlapping shield tunnel provides systemic solution, can directly be used in being designed from now on similar to overlapping tunnel.
Description
Technical field
The invention belongs to underground engineering design fields, and in particular to a kind of soft clay area overlapping shield tunnel upper and lower over long distances
System design method.
Background technology
The utilization of urban underground space are the development trends of country, and important work is played to the development of the following mankind
With Xiong Anxinqu is even more the construction theory for proposing above and below ground synchronous planning.At the same time, rail traffic also has been enter into high speed and sends out
In the exhibition stage, domestic subway was even more in the blowout period of planning, build, opening operation in recent years.Urban underground space day is becoming tight
, the utilization rate that the underground space is improved using various techniques, engineering method has become developing direction, and track is built in the narrow underground space
The case high-volume of traffic occurs.
Shield tunnel up and down be overlapped lay occupy little space, route selection degree of freedom is big, coverage is small, pull open to greatest extent with
The distance of periphery construction of structures reduces environmental risk, is gradually used in project planning design.Although current both domestic and external
Person studies upper and lower overlapping tunnel, but existing research spininess is to specific Engineering Projects, and with engineering geology
Based on preferable short distance overlapping or cross reference, about soft clay area, overlapping tunnel correlative study is less up and down over long distances, lacks
Weary systematic design solution.
Therefore, by studying soft clay area long range overlapping tunnel construction and the Mutual Influence Law of operation stage up and down,
The design method for providing such engineering system is necessary, and is urgent.
Invention content
The present invention proposes in order to solve the problems existing in the prior art, and the purpose is to provide in a kind of soft clay area long range
Lower overlapping shield tunnel System design method.
The technical scheme is that：A kind of soft clay area overlapping shield tunnel System design method upper and lower over long distances,
Include the following steps：
(I) determines overlapping tunnel sequence of construction
Impact analysis according to rear built tunnel to first built tunnel, the present invention in overlapping tunnel sequence of construction be can with but it is unlimited
In getting on, get off.
(II) determines the optimal vertical clear distance D in hole up and down0And minimum vertical clear distance Dmin
Based on the sequence of construction that step (I) determines, after research built tunnel construction cause the vertical displacement of first built tunnel with upper
The lower vertical clear distance variation relation in hole, is carried out curve fitting using power function, and the clear distance value D at inflection point is obtained by curve matching0
It determines optimal vertical clear distance, was determined by the corresponding clear distances of hole additional deformation controlling value δ under upper hole construction period minimum vertical net
Away from Dmin：
Y=a (x+b)-C+ d, x >=0
Wherein：
Y is first built tunnel vertical displacement
X is upper and lower hole vertical clearance
A, b, c, d are fitting coefficient
When taking y '=- 1, x (y '=- 1) is used as optimal vertical clear distance D0, as D ＜ D0When, under the reduction of vertical clear distance causes
The geometric growth of hole vertical displacement, safety economy technical benefits decline to a great extent, therefore take the value as optimal vertical clear distance.
When taking y=δ, x (y=δ) is as minimum vertical clear distance Dmin, as D ＜ DminWhen, first built tunnel is located at rear built tunnel
The main zone of influence, lower hole tunnel vertical displacement are more than additional deformation controlling value δ, therefore take the value as minimum vertical clear distance.
Built tunnel is to first built tunnel and surrounding formations affecting laws after (III) obtains
Based on step (I) determine sequence of construction, research obtain after built tunnel construction period, first built tunnel stress, displacement,
Deformation rule and interlayer earth stress changing rule.
(IV) formulates tunnel itself risk design scheme under the conditions of different clear distances
According to step (III) affecting laws research conclusion, for the vertical clear distance D≤D in upper and lower holemin、Dmin＜ D≤D0, D ＞ D0
Three classes operating mode, formulates design scheme respectively：
As D≤DminWhen, adjusted design is answered, if design adjustment is difficult, is reinforced using tunnel segment structure, stratum reinforces entirely, lower hole
The assembled scheme of the emergent ballast of interim inner support and lower hole；
Work as Dmin＜ D≤D0When, it is emergent using tunnel segment structure reinforcement, stratum local stiffening, the interim inner support in lower hole and lower hole
The assembled scheme of ballast；
As D ＞ D0When, reinforced using tunnel segment structure, the assembled scheme of the emergent slip casting in lower hole.
The step (I), (II), (III) are based on numerical simulation analysis.
In the step (I), overlapping tunnel is influence of the rear built tunnel to first built tunnel with Parallel Tunnel maximum difference,
The Main Basiss chosen using the trend, extreme value and controllability of influence as sequence of construction.
In the step (II), lower hole additional deformation controlling value δ should control protection according to lower hole and require to determine, when without special
It is required that when, lower hole additional deformation controlling value δ takes 10mm.
In the step (III), the influence that upper hole is constructed to lower hole tunnel and the interlayer soil body, aggregate performance is " after first pressing
Unload " trend, the vertical smaller trend of clear distance is notable.
In the step (IV), tunnel segment structure reinforcement includes that tunnel segment structure itself is reinforced, the longitudinally connected bolt of ring is reinforced, connect
Stitch waterproof reinforced.
In the step (IV), stratum reinforces entirely uses ground reinforcing mode, and reinforcing scope is upper and lower hole tunnel and interlayer
The rectangular extent of each 3m in soil body upper and lower, left and right,
In the step (IV), stratum local stiffening reinforces grouting and reinforcing mode, reinforcement depth using secondary deep hole in hole
For 3m.
The interim inner support in lower hole is to control construction stage elder generation's built tunnel stress and deformation as the main purpose, structure shape
Formula can be used according to engineering practice, and ballast is met an urgent need using prepackage sand pocket in the lower hole.
In the step (IV), the design scheme under the conditions of different clear distances should be excellent to rely on dynamic to adjust with shield test section
Change.
The present invention systematically proposes soft clay area long range overlapping shield tunnel design method up and down for the first time, provides vertical
Clear distance controls value-acquiring method, formulates design scheme according to its affecting laws for different clear distances, is overlapped for the narrow underground space
The design of shield tunnel provides systemic solution, can directly be used in being designed from now on similar to overlapping tunnel.
Description of the drawings
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is that rear built tunnel influences schematic diagram to first built tunnel vertical displacement in the present invention；
Fig. 3 is that rear built tunnel influences schematic diagram to first built tunnel internal force in the present invention；
Fig. 4 is lower hole tunnel vertical displacement and vertical clear distance curve matching schematic diagram in the present invention；
Fig. 5 is upper hole construction period interlayer soil body response pattern figure in the present invention；
Fig. 6 is that hole tunnel internal force changing rule figure under the construction period of hole is gone up in the present invention；
Fig. 7 is the full reinforcing scope schematic diagram in stratum in the present invention；
Fig. 8 is stratum local stiffening Grouting Pipe arrangement and reinforcing scope schematic diagram in the present invention；
Fig. 9 is the lower interim inner support schematic diagram in hole in the present invention.
Specific implementation mode
Hereinafter, with reference to drawings and examples, the present invention is described in detail：
As shown in Fig. 1~9, a kind of soft clay area overlapping shield tunnel System design method upper and lower over long distances, including with
Lower step：
(I) determines overlapping tunnel sequence of construction
Impact analysis according to rear built tunnel to first built tunnel, the displacement generated according to first built tunnel, deformation and internal force become
Change, selects to influence the easily controllable sequence of influence that is smaller, generating as suggestion sequence of construction.
As shown in Figure 1, Figure 2, Figure 3 shows, using " getting on, get off " sequence of construction, in vertical displacement influence absolute value, tunnel is first built
It is less than " first up and then down " sequence of construction in terms of road internal force amplitude of variation, considers that tunnel upward floating risk control relatively sinks to having higher
Operability, it is therefore proposed that overlapping tunnel sequence of construction be " getting on, get off ".
(II) determines the optimal vertical clear distance D in hole up and down0And minimum vertical clear distance Dmin
Based on the sequence of construction that step (I) determines, after research built tunnel construction cause the vertical displacement of first built tunnel with upper
The lower vertical clear distance variation relation in hole, is carried out curve fitting using power function, and the clear distance value D at inflection point is obtained by curve matching0
It determines optimal vertical clear distance, was determined by the corresponding clear distances of hole additional deformation controlling value δ under upper hole construction period minimum vertical net
Away from Dmin, as shown in Figure 4.
When taking y '=- 1, x (y '=- 1) is used as optimal vertical clear distance D0, as D ＜ D0When, under the reduction of vertical clear distance causes
The geometric growth of hole vertical displacement.
When taking y=δ, x (y=δ) is as minimum vertical clear distance Dmin, as D ＜ DminWhen, first built tunnel is located at rear built tunnel
The main zone of influence, lower hole tunnel vertical displacement are more than additional deformation controlling value δ.
Built tunnel is to first built tunnel and surrounding formations affecting laws after (III) obtains
Based on step (I) determine sequence of construction, research obtain after built tunnel construction period, first built tunnel stress, displacement,
Deformation rule and interlayer earth stress changing rule.It is given through research, shadow of the upper hole construction to lower hole tunnel and the interlayer soil body
It rings, aggregate performance is the trend of " first press and unload afterwards ", and the vertical smaller trend of clear distance is notable, as shown in Figure 5, Figure 6.
(IV) formulates tunnel itself risk design scheme under the conditions of different clear distances
According to step (III) affecting laws research conclusion, for the vertical clear distance D≤D in upper and lower holemin、Dmin＜ D≤D0, D ＞ D0
Three classes operating mode, formulates design scheme respectively：
As D≤DminWhen, answer adjusted design.If design adjustment is difficult, it is proposed that reinforced using tunnel segment structure, stratum adds entirely
Gu, the interim inner support in lower hole and lower hole meet an urgent need the assembled scheme of ballast.
Work as Dmin＜ D≤D0When, it is emergent using tunnel segment structure reinforcement, stratum local stiffening, the interim inner support in lower hole and lower hole
The assembled scheme of ballast.
As D ＞ D0When, reinforced using tunnel segment structure, the assembled scheme of the emergent slip casting in lower hole.
Stratum reinforces entirely preferably uses ground reinforcing mode, reinforcing scope as shown in Figure 7.
Stratum local stiffening using reinforcing mode in hole, using more injected hole sections of jurisdiction (in addition to the block that binds, remaining each piecemeal
If 3 injected holes), reinforcement means and range are as shown in Figure 8.
Diversified forms can be used in the lower interim inner support in hole, need to be selected according to Practical Project situation, as shown in Figure 9.
The present invention is influenced each other by overlapping shield tunnel and determines overlapping tunnel to surrounding formations affecting laws
Sequence of construction, determine after the optimal vertical clear distance D0 in hole up and down and minimum vertical clear distance Dmin, acquisition built tunnel to first built tunnel and
Surrounding formations affecting laws formulate tunnel itself risk design scheme under the conditions of different clear distances.
The present invention systematically proposes soft clay area long range overlapping shield tunnel design method up and down for the first time, provides vertical
Clear distance controls value-acquiring method, formulates design scheme according to its affecting laws for different clear distances, is overlapped for the narrow underground space
The design of shield tunnel provides systemic solution, can directly be used in being designed from now on similar to overlapping tunnel.
Claims (10)
1. a kind of overlapping shield tunnel System design method above and below soft clay area long range, it is characterised in that：Including following step
Suddenly：
(I) determines overlapping tunnel sequence of construction
Impact analysis according to rear built tunnel to first built tunnel, the present invention in overlapping tunnel sequence of construction be can be, but not limited to elder generation
On after lower；
(II) determines the optimal vertical clear distance D in hole up and down0And minimum vertical clear distance Dmin
Based on the sequence of construction that step (I) determines, after research built tunnel construction cause the vertical displacement of first built tunnel with upper and lower hole
Vertical clear distance variation relation, is carried out curve fitting using power function, and the clear distance value D at inflection point is obtained by curve matching0It determines
Optimal vertical clear distance determined minimum vertical clear distance by the corresponding clear distances of hole additional deformation controlling value δ under upper hole construction period
Dmin：
Y=a (x+b)-C+ d, x >=0
Wherein：
Y is first built tunnel vertical displacement
X is upper and lower hole vertical clearance
A, b, c, d are fitting coefficient
When taking y '=- 1, x (y '=- 1) is used as optimal vertical clear distance D0, as D ＜ D0When, the reduction of vertical clear distance causes lower hole perpendicular
To the geometric growth of displacement, safety economy technical benefits declines to a great extent, therefore takes the value as optimal vertical clear distance.
When taking y=δ, x (y=δ) is as minimum vertical clear distance Dmin, as D ＜ DminWhen, first built tunnel is located at the main of rear built tunnel
The zone of influence, lower hole tunnel vertical displacement are more than additional deformation controlling value δ, therefore take the value as minimum vertical clear distance；
Built tunnel is to first built tunnel and surrounding formations affecting laws after (III) obtains
Based on the sequence of construction that step (I) determines, built tunnel construction period after research obtains, first built tunnel stress, displacement, deformation
Rule and interlayer earth stress changing rule；
(IV) formulates tunnel itself risk design scheme under the conditions of different clear distances
According to step (III) affecting laws research conclusion, for the vertical clear distance D≤D in upper and lower holemin、Dmin＜ D≤D0, D ＞ D0Three classes
Operating mode formulates design scheme respectively：
As D≤DminWhen, adjusted design is answered, if design adjustment is difficult, is reinforced using tunnel segment structure, stratum reinforces entirely, lower hole is interim
The assembled scheme of the emergent ballast of inner support and lower hole；
Work as Dmin＜ D≤D0When, using the emergent ballast in tunnel segment structure reinforcement, stratum local stiffening, the interim inner support in lower hole and lower hole
Assembled scheme；
As D ＞ D0When, reinforced using tunnel segment structure, the assembled scheme of the emergent slip casting in lower hole.
2. overlapping shield tunnel System design method above and below a kind of soft clay area long range according to claim 1,
It is characterized in that：The step (I), (II), (III) are based on numerical simulation analysis.
3. overlapping shield tunnel System design method above and below a kind of soft clay area long range according to claim 1,
It is characterized in that：In the step (I), overlapping tunnel is shadow of the rear built tunnel to first built tunnel with Parallel Tunnel maximum difference
It rings, the Main Basiss chosen using the trend, extreme value and controllability of influence as sequence of construction.
4. overlapping shield tunnel System design method above and below a kind of soft clay area long range according to claim 1,
It is characterized in that：In the step (II), lower hole additional deformation controlling value δ should control protection according to lower hole and require to determine, as no spy
When very requiring, lower hole additional deformation controlling value δ takes 10mm.
5. overlapping shield tunnel System design method above and below a kind of soft clay area long range according to claim 1,
It is characterized in that：In the step (III), the influence that upper hole is constructed to lower hole tunnel and the interlayer soil body, aggregate performance is " after first pressing
Unload " trend, the vertical smaller trend of clear distance is notable.
6. overlapping shield tunnel System design method above and below a kind of soft clay area long range according to claim 1,
It is characterized in that：In the step (IV), tunnel segment structure reinforcement include tunnel segment structure itself reinforce, the reinforcement of ring longitudinally connected bolt,
Seam waterproof is reinforced.
7. overlapping shield tunnel System design method above and below a kind of soft clay area long range according to claim 1,
It is characterized in that：In the step (IV), stratum reinforces entirely uses ground reinforcing mode, and reinforcing scope is upper and lower hole tunnel and interlayer
The rectangular extent of each 3m in soil body upper and lower, left and right.
8. overlapping shield tunnel System design method above and below a kind of soft clay area long range according to claim 1,
It is characterized in that：In the step (IV), stratum local stiffening reinforces grouting and reinforcing mode, reinforcement depth using secondary deep hole in hole
For 3m.
9. overlapping shield tunnel System design method above and below a kind of soft clay area long range according to claim 1,
It is characterized in that：The interim inner support in lower hole is to control construction stage elder generation's built tunnel stress and deformation as the main purpose, structure
Form can be used according to engineering practice, and ballast is met an urgent need using prepackage sand pocket in the lower hole.
10. overlapping shield tunnel System design method above and below a kind of soft clay area long range according to claim 1,
It is characterized in that：In the step (IV), the design scheme under the conditions of different clear distances should be that dynamic is relied on to adjust with shield test section
Optimization.
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| CN201810209955.6A CN108376205B (en) | 2018-03-14 | 2018-03-14 | Systematic design method for long-distance up-down overlapping shield tunnel in soft soil area |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882242A (en) * | 2019-03-15 | 2019-06-14 | 青岛理工大学 | A kind of traffic tunnel vault collapsing method for quickly identifying |
| CN110080781A (en) * | 2019-05-05 | 2019-08-02 | 济南轨道交通集团有限公司 | Between a kind of shield tunnel multi-region, small interval, it is overlapping under wear high-level bridge construction method |
| CN112727484A (en) * | 2021-01-06 | 2021-04-30 | 中建一局集团建设发展有限公司 | Shield-pipe-jacking up-down parallel overlapping tunnel structure and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109882242A (en) * | 2019-03-15 | 2019-06-14 | 青岛理工大学 | A kind of traffic tunnel vault collapsing method for quickly identifying |
| CN110080781A (en) * | 2019-05-05 | 2019-08-02 | 济南轨道交通集团有限公司 | Between a kind of shield tunnel multi-region, small interval, it is overlapping under wear high-level bridge construction method |
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| CN112727484B (en) * | 2021-01-06 | 2022-12-13 | 中建一局集团建设发展有限公司 | Shield-pipe-jacking up-down parallel overlapping tunnel structure and construction method thereof |
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