CN108170996A - Existing building determines method to adjacent piles stability influence critical line - Google Patents
Existing building determines method to adjacent piles stability influence critical line Download PDFInfo
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- CN108170996A CN108170996A CN201810089896.3A CN201810089896A CN108170996A CN 108170996 A CN108170996 A CN 108170996A CN 201810089896 A CN201810089896 A CN 201810089896A CN 108170996 A CN108170996 A CN 108170996A
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Abstract
Method is determined to adjacent piles stability influence critical line the invention discloses existing building, is related to technical field of civil engineering, includes the following steps：(1), tunnel construction parameterized model is established, (2), the critical coordinate position that building has an impact adjacent piles stability is determined, (3), critical line of the existing building to adjacent piles stability influence is drawn, (4), the critical line that simulation is calculated using quadratic function are fitted.The present invention can be by establishing model and the critical line for analyzing and processing determining existing building and being had an impact to adjacent piles stability to data, and it is fitted using quadratic function, it realizes in Practical Project, proposed tunnel centre coordinate value is substituted into existing building influences in risk function, the influence that building generates Tunnel Stability is can determine whether, convenient for instructing site operation.
Description
Technical field
The present invention relates to technical field of civil engineering, and more particularly to existing building is to adjacent piles stability influence critical line
Determine method.
Background technology
Constructing tunnel inevitably generates surrounding soil disturbance, and ground settlement caused by construction and deformation are to building
Influence degree, in addition to stratum characteristic, also with the basis of building and the relative position of structural shape, building and tunnel,
And earth's surface deformation properties are related with size.
At present, with the rapid development of China's Urban Underground urban rail transit construction, more and more city tunnel proximities in
Above-ground structures is constructed, and not only seriously affects the stability of building structure, while also increase the construction risk in tunnel.
FLAC3D softwares are used for the problem that influences each other of tunnel proximity construction, all intelligence etc., simulate two-wire tunneling
Tunnel successively passes through the operating mode of isolated footing frame structure building, has studied the frame structure building caused by tunnel excavation
Composition deformation rule and tunnel deformation rule；Zhang Huijian etc. introduces Strength Reduction Method by numerical simulation means, near to newly built tunnels
The failure mode for connecing existing building construction is studied, and establishes the influence subregion of tunnel proximity architecture construction, and in shadow
It is proposed countermeasure is classified on the basis of ringing subregion；Chen Yujia etc., which is combined, wears certain high building project reality under Qingdao region tunnel, adopt
The relationship of different overlying strata thickness and tunnel proximity construction failure mechanism is inquired into Finite element ultimate analysis method, but
It is to be concentrated mainly on building physical and mechanical parameter, distribution of strata and tunnel for the problem of influencing each other of tunnel proximity construction
The influence to earth's surface deformation, building and Tunnel Stability etc. such as road buried depth, and it is in the majority with special sex chromosome mosaicism, and be upgraded to general
All over rule so that formed guide, standard it is very few, so just needing a kind of existing building critical to adjacent piles stability influence
Line determines method.
Invention content
Method is determined to adjacent piles stability influence critical line an embodiment of the present invention provides existing building, to solve
Problems of the prior art.
Existing building determines method to adjacent piles stability influence critical line, includes the following steps：
(1), tunnel-architectural modulus model is established
Using the Dynamic Simulation Analysis method of ABAQUS softwares, voluntarily programming, which is established, can change tunnel-building with respect to position
The parameterized model put, the relative position parameter (θ, l) between tunnel and building is variable element, is established in finite element model
The relative position in tunnel is controlled in journey, model is divide into upper part and lower part：Upper building and the lower part soil body, building described in top
Its contact relation is simulated using common points between the soil body described in lower part, the building is located at the interposition of the soil body
Put, the vault of the tunnel spray anchor supporting section is A points, according to engineering practice, determine the building, the soil body and
The calculating parameter and model of supporting and protecting system of tunnel；
(2), the critical coordinate position that building has an impact adjacent piles stability is determined
Because under normal circumstances, the displacement of tunnel structure absolute maximum is no more than 20mm, establishment is based on
The tunnel deformation finite element modelling finder of MATLAB --- ABAQUS, using tunnel vault largest settlement 20mm as building
The criterion that object has an impact Tunnel Stability calls ABAQUS to carry out tunnel deformation FEM calculation using Mat lab,
With reference to Nelder-Mead optimization algorithms, the critical coordinate position that building has an impact adjacent piles stability is determined, specifically
Step is as follows：
1) relative position parameter (θ, l) initial value and computer capacity, are inputted in MATLAB,
2) ABAQUS, is called, carries out FEM calculation,
3) output result of calculation file (.ODB),
4) ABAQUS is called to read result of calculation, exports vault A point settling amounts,
5) simultaneously calculating target function value F=is established in MATLAB | vault A point settling amounts -20mm |,
6) optimization processing,
7) judge whether F → min, if it is not, then correcting Optimal Parameters (θ, l), return again to step 2),
8) judge whether F → min, if so, output optimum results, are obtained critical coordinate position (X, Y)；
(3), critical line of the existing building to adjacent piles stability influence is drawn
According to the critical coordinate position in tunnel center (X, Y), draw existing building and adjacent piles stability influence is faced
Boundary line when tunnel center is located within critical line range, needs to take targetedly construction and supporting during tunnel excavation
Scheme reduces the disturbance to surrounding soil, while should strengthen deformation monitoring；When other than tunnel center is located at critical line range,
It is believed that influence of the existing building to Tunnel Stability is smaller；
(4), the critical line that simulation is calculated using quadratic function is fitted
Further quantitative analysis existing building is to the coverage of adjacent piles stability, using quadratic function to simulation
The critical line being calculated is fitted, and obtains corresponding fitting function, in Practical Project, by proposed tunnel centre coordinate
Value, which substitutes into existing building, to be influenced in risk function, you can the influence that building generates Tunnel Stability is judged, convenient for guidance
Site operation.
Preferably, the supporting and protecting system of tunnel includes lining cutting and grouted anchor bar, the tunnel periphery sets lining cutting, the lining
Build periphery setting grouted anchor bar.
Preferably, the MATLAB is a business mathematics software, the ABAQUS is the finite element of a engineering simulation
Software.
Advantageous effect of the present invention：The present invention by establishing model and can determine existing building pair to the analyzing and processing of data
The critical line that adjacent piles stability has an impact, and be fitted using quadratic function, it realizes in Practical Project, it will be proposed
Tunnel centre coordinate value, which substitutes into existing building, to be influenced in risk function, you can judges the shadow that building generates Tunnel Stability
It rings, convenient for instructing site operation.
Description of the drawings
Fig. 1 is the tunnel that existing building provided in an embodiment of the present invention determines adjacent piles stability influence critical line method
Road-architectural modulus model schematic；
Fig. 2 is the structure diagram of tunnel spray anchor supporting section；
Fig. 3 is tunnel deformation finite element modelling positioning analysis flow diagram；
Fig. 4 is schematic diagram of the existing building to adjacent piles stability influence critical line.
Specific embodiment
With reference to the attached drawing in inventive embodiments, the technical solution in the embodiment of the present invention is carried out clear, complete
Description, it is to be understood that protection scope of the present invention is not restricted by specific implementation.
With reference to Fig. 1-4, method is determined to adjacent piles stability influence critical line the present invention provides existing building, including
Following steps：
(1), tunnel-architectural modulus model is established
Using the Dynamic Simulation Analysis method of ABAQUS softwares, voluntarily programming, which is established, can change tunnel-building with respect to position
The parameterized model put, the relative position parameter (θ, l) between tunnel and building is variable element, is established in finite element model
The relative position in tunnel is controlled in journey, model is divide into upper part and lower part：Upper building and the lower part soil body, building described in top
Its contact relation is simulated using common points between the soil body described in lower part, the building is located at the interposition of the soil body
Put, the vault of the tunnel spray anchor supporting section is A points, according to engineering practice, determine the building, the soil body and
The calculating parameter and model of supporting and protecting system of tunnel；
(2), the critical coordinate position that building has an impact adjacent piles stability is determined
Because under normal circumstances, the displacement of tunnel structure absolute maximum is no more than 20mm, establishment is based on
The tunnel deformation finite element modelling finder of MATLAB --- ABAQUS, using tunnel vault largest settlement 20mm as building
The criterion that object has an impact Tunnel Stability calls ABAQUS to carry out tunnel deformation FEM calculation using Mat lab,
With reference to Nelder-Mead optimization algorithms, the critical coordinate position that building has an impact adjacent piles stability is determined, specifically
Step is as follows：
1) relative position parameter (θ, l) initial value and computer capacity, are inputted in MATLAB,
2) ABAQUS, is called, carries out FEM calculation,
3) output result of calculation file (.ODB),
4) ABAQUS is called to read result of calculation, exports vault A point settling amounts,
5) simultaneously calculating target function value F=is established in MATLAB | vault A point settling amounts -20mm |,
6) optimization processing,
7) judge whether F → min, if it is not, then correcting Optimal Parameters (θ, l), return again to step 2),
8) judge whether F → min, if so, output optimum results, are obtained critical coordinate position (X, Y)；
(3), critical line of the existing building to adjacent piles stability influence is drawn
According to the critical coordinate position in tunnel center (X, Y), draw existing building and adjacent piles stability influence is faced
Boundary line when tunnel center is located within critical line range, needs to take targetedly construction and supporting during tunnel excavation
Scheme reduces the disturbance to surrounding soil, while should strengthen deformation monitoring；When other than tunnel center is located at critical line range,
It is believed that influence of the existing building to Tunnel Stability is smaller；
(4), the critical line that simulation is calculated using quadratic function is fitted
Further quantitative analysis existing building is to the coverage of adjacent piles stability, using quadratic function to simulation
The critical line being calculated is fitted, and obtains corresponding fitting function, in Practical Project, by proposed tunnel centre coordinate
Value, which substitutes into existing building, to be influenced in risk function, you can the influence that building generates Tunnel Stability is judged, convenient for guidance
Site operation.
The supporting and protecting system of tunnel includes lining cutting and grouted anchor bar, and the tunnel periphery sets lining cutting, the lining cutting periphery
Grouted anchor bar is set.
The MATLAB is a business mathematics software, and the ABAQUS is the finite element software of a engineering simulation.
Specific embodiment 1：
(1), tunnel-architectural modulus model is established：Depth of building is 50m, width 20m, considers that its rigidity is larger, surely
It is qualitative good, according to《Code for design of concrete structures》, equivalent elastic modulus is taken as 20GPa, Poisson's ratio 0.17, mechanical behavior
It is simulated using elastic model；Lower part soil body height is 120m, and width 200m, lower boundary is fixed constraint, and side is normal direction position
Constraint is moved, top is free boundary, and with reference to engineering geologic investigation data, the model middle and lower part soil body is based on middle weathering shale packsand
It calculates, severe 2.15kN/m3, cohesion 0.14MPa, internal friction angle is 36 °, elasticity modulus 0.5GPa, and Poisson's ratio is
0.27, the stress-strain relation of the soil body is described using Drucke-Prager constitutive models.
The a diameter of 6.5m of tunnel excavation, using bolt-spary supports mode, grouted anchor bar length is 3.5m, diameter 22mm, bullet
Property modulus be 105GPa, Poisson's ratio 0.2, tensile strength 300kN.Anchor pole is arranged in tunnel upper semi-circle, between adjacent anchor pole
Angle is 10 °；In calculating process, using * Embedded orders, anchor pole is embedded into the soil body.After suspension roof support, Xiang Wei
Rock injection 30cm thickness C20 concrete forms lining cutting, severe 25kN/m3, elasticity modulus 42GPa, Poisson's ratio 0.25；Meter
During calculation, country rock physical and mechanical parameter is changed by * Temperature orders and simulates support action effect.
(2), it determines the critical coordinate position that building has an impact adjacent piles stability and draws critical line：According to
Tunnel deformation finite element modelling method for positioning analyzing determines the critical coordinate position in tunnel center (X, Y), and draws existing building pair
The critical line of adjacent piles stability influence, it can be seen that building influences Tunnel Deformation critical line in " upper opening is thrown
Object line " shape.
When tunnel center is located within critical line range, tunnel excavation process need to take targetedly construction and supporting side
Case reduces the disturbance to surrounding soil, while should strengthen deformation monitoring；It, can when other than tunnel center is located at critical line range
Think that influence of the building to Tunnel Stability is smaller.
(3), the critical line that simulation is calculated using quadratic function is fitted：It builds for further quantitative analysis is existing
It builds to adjacent piles stability influence range, the critical line that simulation is calculated using quadratic function is fitted, and obtain
Corresponding fitting function, is expressed as：Y=0.1684X2- 45.5836, coefficient R2=0.998, show that quadratic function can be very well
Ground fits the critical line that existing building has an impact Tunnel Deformation.In Practical Project, by proposed tunnel center
Coordinate value, which substitutes into existing building, to be influenced in risk function, you can is judged the influence that building generates Tunnel Stability, is convenient for
Instruct site operation.
In conclusion the present invention can be by establishing model and determining existing building to neighbouring tunnel to the analyzing and processing of data
The critical line that road stability has an impact, and be fitted using quadratic function, it realizes in Practical Project, it will be in proposed tunnel
Heart coordinate value, which substitutes into existing building, to be influenced in risk function, you can judges the influence that building generates Tunnel Stability, just
In instructing site operation.
Disclosed above is only the specific embodiment of the present invention, and still, the embodiment of the present invention is not limited to this, is appointed
What what those skilled in the art can think variation should all fall into protection scope of the present invention.
Claims (3)
1. existing building determines method to adjacent piles stability influence critical line, which is characterized in that includes the following steps：
(1), tunnel-architectural modulus model is established
Using the Dynamic Simulation Analysis method of ABAQUS softwares, voluntarily programming, which is established, can change tunnel-building relative position
Parameterized model, the relative position parameter (θ, l) between tunnel and building are variable element, during finite element model foundation
The relative position in tunnel is controlled, model is divide into upper part and lower part：Upper building and the lower part soil body, building described in top is under
Its contact relation is simulated using common points between the soil body described in portion, the building is located at the centre position of the soil body, institute
The vault for stating tunnel spray anchor supporting section is A points, according to engineering practice, determines the building, the soil body and tunnel
The calculating parameter and model of support system；
(2), the critical coordinate position that building has an impact adjacent piles stability is determined
Because under normal circumstances, the displacement of tunnel structure absolute maximum is no more than 20mm, establishment is based on MATLAB ---
The tunnel deformation finite element modelling finder of ABAQUS is steady to tunnel using tunnel vault largest settlement 20mm as building
The qualitative criterion having an impact calls ABAQUS to carry out tunnel deformation FEM calculation, with reference to Nelder- using Matlab
Mead optimization algorithms determine the critical coordinate position that building has an impact adjacent piles stability, are as follows：
1) relative position parameter (θ, l) initial value and computer capacity, are inputted in MATLAB,
2) ABAQUS, is called, carries out FEM calculation,
3) output result of calculation file (.ODB),
4) ABAQUS is called to read result of calculation, exports vault A point settling amounts,
5) simultaneously calculating target function value F=is established in MATLAB | vault A point settling amounts -20mm |,
6) optimization processing,
7) judge whether F → min, if it is not, then correcting Optimal Parameters (θ, l), return again to step 2),
8) judge whether F → min, if so, output optimum results, are obtained critical coordinate position (X, Y)；
(3), critical line of the existing building to adjacent piles stability influence is drawn
According to the critical coordinate position in tunnel center (X, Y), critical line of the existing building to adjacent piles stability influence is drawn,
When tunnel center is located within critical line range, need to take targetedly construction and supporting scheme during tunnel excavation,
The disturbance to surrounding soil is reduced, while deformation monitoring should be strengthened；When other than tunnel center is located at critical line range, it is believed that
Influence of the existing building to Tunnel Stability is smaller；
(4), the critical line that simulation is calculated using quadratic function is fitted
Further quantitative analysis existing building calculates simulation using quadratic function the coverage of adjacent piles stability
Obtained critical line is fitted, and obtains corresponding fitting function, in Practical Project, by proposed tunnel centre coordinate value generation
Entering existing building influences in risk function, you can the influence that building generates Tunnel Stability is judged, convenient for guidance scene
Construction.
2. the method as described in claim 1, which is characterized in that the supporting and protecting system of tunnel includes lining cutting and grouted anchor bar, institute
The setting lining cutting of tunnel periphery is stated, the lining cutting periphery sets grouted anchor bar.
3. the method as described in claim 1, which is characterized in that the MATLAB is a business mathematics software, described
ABAQUS is the finite element software of a engineering simulation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796765A (en) * | 2021-01-07 | 2021-05-14 | 中铁十九局集团第三工程有限公司 | Partitioned grouting reinforcement method for tunnel adjacent building construction |
| CN114218816A (en) * | 2021-07-28 | 2022-03-22 | 浙江大学 | Method for calculating longitudinal maximum displacement of lower horizontal subway tunnel caused by foundation pit excavation |
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| JP2003314188A (en) * | 2002-04-23 | 2003-11-06 | Ohbayashi Corp | Method for predicting settlement in excavation of tunnel |
| CN107330194A (en) * | 2017-06-29 | 2017-11-07 | 暨南大学 | The Numerical Analysis methods that Shield Tunneling influences on neighbouring multi-column pier foundation |
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| JP2003314188A (en) * | 2002-04-23 | 2003-11-06 | Ohbayashi Corp | Method for predicting settlement in excavation of tunnel |
| CN107330194A (en) * | 2017-06-29 | 2017-11-07 | 暨南大学 | The Numerical Analysis methods that Shield Tunneling influences on neighbouring multi-column pier foundation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796765A (en) * | 2021-01-07 | 2021-05-14 | 中铁十九局集团第三工程有限公司 | Partitioned grouting reinforcement method for tunnel adjacent building construction |
| CN114218816A (en) * | 2021-07-28 | 2022-03-22 | 浙江大学 | Method for calculating longitudinal maximum displacement of lower horizontal subway tunnel caused by foundation pit excavation |
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Application publication date: 20180615 |