CN108154002A - A kind of combined type Middle Wall of Multi-Arch Highway Tunnel structure stress computational methods - Google Patents
A kind of combined type Middle Wall of Multi-Arch Highway Tunnel structure stress computational methods Download PDFInfo
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Abstract
The present invention relates to a kind of combined type Middle Wall of Multi-Arch Highway Tunnel structure stress computational methods, belong to Tunnel Engineering field.This method is in combined type multiple-arch tunnel digging process, and after the completion of first branch button arch, just to prop up as research object, just branch is reduced to hold-down support with mid-board connecting portion, and just branch end internal force is calculated according to load structure method.Again using mid-board as primary structure member, first branch end internal force, middle partition wall structure dead weight, mid-board top triangular earthing weight and substrate vertical supporting power are applied on mid-board, according to the equation of static equilibrium and false stull arrangement, obtain false stull internal force, and then internal force situation at mid-board plane of weakness is obtained, checking of bearing capacity is carried out to false stull and mid-board.The method of the present invention is simple, can solve the rational design of false stull in construction, and can solve mid-board sectional dimension and arrangement of reinforcement checking computations, and the blindness of false stull and mid-board is avoided to design.
Description
Technical field
The present invention relates to a kind of middle partition wall structure force calculation methods, and in particular to a kind of combined type Middle Wall of Multi-Arch Highway Tunnel
Structure stress computational methods belong to Tunnel Engineering field.
Background technology
Multiple-arch tunnel is due to openings position selection degree of freedom is big, lead floor space is small, convenient for Bridge-wire fusing time and fortune
The advantages that battalion's management, it is widely used in engineering practice at present.Multiple-arch tunnel mainly includes monoblock type multiple-arch tunnel and compound
Formula multiple-arch tunnel.Combined type multiple-arch tunnel with respect to monoblock type multiple-arch tunnel there is secondary lining to close cyclization, stress system alone
Simply, guarded drainage effect is good and the later stage runs the advantages that disease is few.Its effect of combined type Middle Wall of Multi-Arch Highway Tunnel is mainly reflected in
First branch button arch process functions only as both sides tunnel connecting into an entirety after secondary lining closing cyclization and transmits horizontal direction
The effect of active force.First branch button arch process, mid-board stress is complicated, and mechanics conversion times are various, is easy to cause its deflection and invades
Secondary lining gauge is accounted for, so as to influence the quality of entire engineering.Combined type Middle Wall of Multi-Arch Highway Tunnel structural stress analysis method and
False stull quantitative analysis is not solved effectively so far.
Invention content
Based on above-mentioned engineering roadblock and present situation, it is an object of the invention to solve current combined type Middle Wall of Multi-Arch Highway Tunnel knot
Structure calculates the engineering roadblock that the setting of cumbersome and false stull is difficult to quantitative analysis, makes up the deficiency of conventional design, it is proposed that a kind of
Novel effective computational methods, can efficiently calculate middle partition wall structure stress and quantitative analysis false stull.
To achieve these goals, specific technical solution of the present invention is as follows：
A kind of combined type Middle Wall of Multi-Arch Highway Tunnel structure stress computational methods, it is characterised in that：Include the following steps：
Step (1), outside tunnel Chu Zhi ends internal force calculate
Just branch button arch is completed for the outside tunnel of combined type multiple-arch tunnel, according to obtaining tunnel arch pressure at right angle and level is enclosed
Rock pressure power is just propped up according to load structure method independent analysis, and just branch is reduced to hold-down support with mid-board connecting portion, finally obtains
First branch end internal force；
Step (2), the distribution of variable cross-section mid-board internal force calculate
Using mid-board as research object, internal force, mid-board dead weight, mid-board top triangular that step (1) is obtained
Earthing weight and mid-board substrate vertical supporting power act on mid-board, according to static balance condition, calculate false stull internal force,
Obtain the distribution of variable cross-section mid-board internal force, and then section checking and arrangement of reinforcement；Calculating process is not considered between mid-board and country rock
Frictional force；
Just branch structure end internal force calculates for step (3), interior outside tunnel
Just branch button arch is completed in outside tunnel in combined type multiple-arch tunnel, and respectively obtaining interior outside tunnel by step (1) just props up
Structure end internal force；
The internal force of step (4), false stull and variable cross-section mid-board calculates
First branch end internal force, middle partition wall structure dead weight, the mid-board top triangular earthing weight that step (3) is calculated
Amount and vertical supporting power act on mid-board, according to false stull deployment scenarios, obtain false stull and variable cross-section mid-board
Internal force, and its bearing capacity is checked.
Further, in step (1), the slump pitch of arch is determined according to Grades of Surrounding Rock, considers stress release rate η, obtained outer
Side Tunnel Surrounding Rock Pressure is just propped up and is connect with country rock by the spring chain bar only by pressure.
Further, in step (2), according to static balance condition, judge whether mid-board opposite side needs false stull
Support；
When false stull is set if desired, according to stress balance, the axle power of every stull is obtained；Mid-board finally can be obtained most
The internal force of plane of weakness, and arrangement of reinforcement and checking of bearing capacity are carried out to it.
Further, in step (3), consider stress release rate η, interior outside Tunnel Surrounding Rock Pressure is obtained, respectively with inside and outside
The first Zhi Zuowei research objects in side tunnel, just branch will be reduced to hold-down support with mid-board connecting portion, using load-structure method,
It is connected between preliminary bracing and country rock by the spring chain bar being only pressurized, obtains interior outside tunnel Chu Zhi ends internal force.
Further, in step (4), according to static balance condition, judge whether mid-board opposite side needs false stull
Support；By false stull designing scheme, the axle power of every stull is obtained, can finally obtain the internal force of mid-board most plane of weakness, and
Arrangement of reinforcement and checking of bearing capacity are carried out to it.According to the different arrangement forms of false stull, corresponding stull internal force is calculated, makes horizontal stroke
Support structure design is more economical reasonable.
Compared with prior art, technique effect of the invention essentially consists in：
(1), false stull force-bearing situation during present invention energy quantitative analysis combined type Multi-arch Tunnel Construction, makes interim horizontal stroke
Support design is more rationally and effective.
(2), the present invention provides the Calculation Methods for Internal Force of combined type Middle Wall of Multi-Arch Highway Tunnel structure, according to standing balance side
Journey and false stull arrangement obtain false stull internal force, and then obtain internal force situation at mid-board plane of weakness, to interim
Stull and mid-board carry out checking of bearing capacity.Size and the Reinforcement Design for making mid-board are more reasonable, can efficiently calculate and test
Calculate mid-board sectional dimension and arrangement of reinforcement.
(3), the present invention effectively realizes the reasonable computation and design of mid-board and false stull, evades and blindly designs and apply
Work, economy and safety are notable.
Description of the drawings
Fig. 1 is the combined type multiple-arch tunnel structure diagram of the present invention；
Fig. 2 is the combined type Middle Wall of Multi-Arch Highway Tunnel calculation flow chart of the present invention；
Fig. 3 is the combined type Middle Wall of Multi-Arch Highway Tunnel structural computational model of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the present embodiment is carried out clearly and completely
Description, it is clear that described embodiment is only the example to a part of example of the present invention rather than whole.Based on the present invention
In embodiment, the every other implementation that those of ordinary skill in the art are obtained under the premise of not making the creative labor
Example, shall fall within the protection scope of the present invention.
As shown in Figure 1, the combined type multiple-arch tunnel that the present embodiment is directed to includes inside tunnel 1, outside tunnel 2 and is set on
Middle drift 3 between inside tunnel 1, outside tunnel 2, middle drift 3 include mid-board 6, and 3 During Initial Stage Construction supporting 7 of middle drift is gone back
Preliminary bracing 9 and secondary lining 5 including inside tunnel 1, the preliminary bracing 8 in outside tunnel 2 and secondary lining 4.
As shown in Fig. 2, for above-mentioned combined type multiple-arch tunnel, combined type Middle Wall of Multi-Arch Highway Tunnel structure stress computational methods
It is as follows：
Tunnel arch pressure at right angle and horizontal adjoining rock calculation of pressure on the outside of step (1), multiple-arch tunnel：
Based on collapse arch it is assumed that with reference to《Vcehicular tunnel design specification》(JTGD70-2004) depth of single hole tunnel is buried point
Boundary's method determines that the depth buries boundary and tunnel load mode, obtains outer tunnel arch pressure at right angle qwWith horizontal adjoining rock pressure ew1、
ew2、ew1’、ew2', as shown in figure 3, specific as follows：
A, the tunnel depth buries judgement, by the judgement formula of load height equivlent：Hp=(2~2.5) hpIn formula：HpFor the depth
Bury tunnel boundary depth (unit：m)；IV~VI grades of country rocks take Hp=2.5hp, I~III level country rock takes Hp=2.0hp；
Hp is load height equivlent (unit：m).
B, after being judged according to Grades of Surrounding Rock and buried depth, reference《Vcehicular tunnel design specification》(JTGD70-2004) annex E and
Annex F obtains outer tunnel arch pressure at right angle qw, both sides horizontal adjoining rock pressure ew1、ew2、ew1’、ew2’。
Step (2), the internal force calculating of first branch end
According to Grades of Surrounding Rock reference《Vcehicular tunnel specification》Appendix D determines tunnel excavation Stress relieving of surrounding rocks rate as η, then
The pressure from surrounding rock that outside tunnel is born is η qw、ηew1、ηew1、ηew1’、ηew1’。
With Zhi Zuowei research objects at the beginning of the tunnel of outside, first branch is reduced to hold-down support with mid-board connecting portion, is used
Load-structure method is connected by the spring chain bar being only pressurized between preliminary bracing and country rock, obtains the internal force of first branch end, such as
Shown in Fig. 3, internal force includes moment MwAnd Mw', axle power NwAnd Nw' and shearing QwAnd Qw', it is that just, axle power is pressurized clockwise that moment of flexure, which is,
Just, to shear so that component clockwise turns to just.
Step (3), mid-board internal force calculate
The frictional force of mid-board and country rock is not considered, using mid-board as research object, as shown in figure 3, applying interval wall top
The weight W of portion's triangular blocks1, reaction force F, the dead load W of first branch end internal force and lower part vertical supporting power FIt is perpendicular。
By whether meet ∑ Fx=0 judges whether mid-board opposite side needs false stull to support.If desired setting is faced
When stull when, according to Suspending pole mode scheme, by ∑ Fx=0；∑Fy=0；∑M=0 obtains the axle power F of every stull1、F2、…、
Fn.The internal force (moment M, axle power N and shearing Q) of mid-board most plane of weakness can finally be obtained and arrangement of reinforcement is carried out to it and bearing capacity is tested
It calculates.
Outside tunnel arch pressure at right angle and horizontal adjoining rock calculation of pressure in step (4), multiple-arch tunnel
After the tunnel excavation of inside, based on double slumps arch it is assumed that with reference to《Vcehicular tunnel design specification》(JTGD70-2004)
Multiple-arch tunnel respectively obtains interior outside tunnel vault pressure at right angle qn、qw, both sides horizontal adjoining rock pressure en1、en2、en1’、en2’、
ew1、ew2、ew1’、ew2', as shown in Figure 3.
Step (5), interior outside tunnel Chu Zhi ends internal force calculate
According to Grades of Surrounding Rock reference《Vcehicular tunnel specification》Appendix D determines tunnel excavation Stress relieving of surrounding rocks rate as η, then
The pressure from surrounding rock η q that medial and lateral tunnel is bornn、ηqw、ηen1、ηen2、ηen1’、ηen2’、ηew1、ηew2、ηew1’、ηew2', respectively with
First branch is reduced to hold-down support, using load-knot by tunnel first Zhi Zuowei research objects in medial and lateral with mid-board connecting portion
Structure method is connected by the spring chain bar being only pressurized between preliminary bracing and country rock, obtains interior outside tunnel Chu Zhi ends internal force, such as
Shown in Fig. 3, internal force includes moment Mn’、Mw', axle power Nn’、Nw', shear Qn’、Qw', it is that just, axle power compression is clockwise that moment of flexure, which is,
Just, shearing is so that component clockwise turns to just.
The internal force calculating of step (6), mid-board most plane of weakness
The frictional force between mid-board and country rock is not considered, using mid-board as research object, wall top triangular in application
The weight W of block1F in reaction with first branch endIt is perpendicular.According to whether meet ∑ Fx=0 judges whether opposite side needs interim horizontal stroke
Support support.By false stull designing scheme, ∑ Fx=0；∑Fy=0；∑M=0 obtains the axle power F of every stull1’、F2’、…、
Fn’.The internal force (moment M ', axle power N ' and shearing Q ') of mid-board most plane of weakness after interior outside tunnel excavation and right can finally be obtained
It carries out arrangement of reinforcement and checking of bearing capacity.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (5)
1. a kind of combined type Middle Wall of Multi-Arch Highway Tunnel structure stress computational methods, it is characterised in that：Include the following steps：
（1）, outside tunnel Chu Zhi ends internal force calculate
Just branch button arch is completed for the outside tunnel of combined type multiple-arch tunnel, according to obtaining tunnel arch pressure at right angle and horizontal adjoining rock pressure
Power is just propped up according to load structure method independent analysis, and just branch is reduced to hold-down support with mid-board connecting portion, finally obtains and just props up
End internal force；
（2）, variable cross-section mid-board internal force distribution calculate
Using mid-board as research object, by step（1）Obtained internal force, mid-board dead weight, mid-board top triangular earthing
Weight and mid-board substrate vertical supporting power act on mid-board, according to static balance condition, calculate false stull internal force, obtain
Variable cross-section mid-board internal force is distributed, and then section checking and arrangement of reinforcement；Calculating process does not consider the friction between mid-board and country rock
Power；
（3）, just branch structure end internal force calculates for interior outside tunnel
Just branch button arch is completed in outside tunnel in combined type multiple-arch tunnel, by step（1）Respectively obtain interior outside tunnel just branch structure
End internal force；
（4）, false stull and variable cross-section mid-board internal force calculate
By step（3）The first branch end internal force that is calculated, middle partition wall structure dead weight, mid-board top triangular earthing weight and
Vertical supporting power acts on mid-board, according to false stull deployment scenarios, obtains the internal force of false stull and variable cross-section mid-board,
And its bearing capacity is checked.
2. combined type Middle Wall of Multi-Arch Highway Tunnel structure stress computational methods according to claim 1, it is characterised in that：Step
（1）In, the slump pitch of arch is determined according to Grades of Surrounding Rock, considers stress release rate η, obtains outside Tunnel Surrounding Rock Pressure, just branch with
Country rock by the spring chain bar of pressure by only being connected.
3. combined type Middle Wall of Multi-Arch Highway Tunnel structure stress computational methods according to claim 1, it is characterised in that：Step
（2）In, according to static balance condition, judge whether mid-board opposite side needs false stull to support；
When false stull is set if desired, according to stress balance, the axle power of every stull is obtained；It is most weak to finally obtain mid-board
The internal force in section, and arrangement of reinforcement and checking of bearing capacity are carried out to it.
4. combined type Middle Wall of Multi-Arch Highway Tunnel structure stress computational methods according to claim 1, it is characterised in that：Step
（3）In, consider stress release rate η, obtain interior outside Tunnel Surrounding Rock Pressure, respectively with Zhi Zuowei researchs pair at the beginning of the tunnel of medial and lateral
As first branch is reduced to hold-down support with mid-board connecting portion, using load-structure method, is led between preliminary bracing and country rock
The spring chain bar connection being only pressurized is crossed, obtains interior outside tunnel Chu Zhi ends internal force.
5. combined type Middle Wall of Multi-Arch Highway Tunnel structure stress computational methods according to claim 1, it is characterised in that：Step
（4）In, according to static balance condition, judge whether mid-board opposite side needs false stull to support；By false stull design side
Case obtains the axle power of every stull, finally obtains the internal force of mid-board most plane of weakness, and carries out arrangement of reinforcement to it and bearing capacity is tested
It calculates.
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Cited By (3)
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| CN110210128A (en) * | 2019-06-03 | 2019-09-06 | 河北建筑工程学院 | A kind of quasi- full interior hydraulic design method of reinforced concrete frame structure optimization |
| CN110688696A (en) * | 2019-09-16 | 2020-01-14 | 中铁第五勘察设计院集团有限公司 | Parameter determination method and device for tunnel supporting structure |
| CN116186829A (en) * | 2022-12-05 | 2023-05-30 | 中铁第四勘察设计院集团有限公司 | Method and device for constructing composite lining calculation model and terminal equipment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110210128A (en) * | 2019-06-03 | 2019-09-06 | 河北建筑工程学院 | A kind of quasi- full interior hydraulic design method of reinforced concrete frame structure optimization |
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| CN116186829A (en) * | 2022-12-05 | 2023-05-30 | 中铁第四勘察设计院集团有限公司 | Method and device for constructing composite lining calculation model and terminal equipment |
| CN116186829B (en) * | 2022-12-05 | 2024-02-09 | 中铁第四勘察设计院集团有限公司 | Method and device for constructing composite lining calculation model and terminal equipment |
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