CN104318004A - Deformation-data-based bending moment internal force analysis method for secondary lining structure of tunnel - Google Patents
Deformation-data-based bending moment internal force analysis method for secondary lining structure of tunnel Download PDFInfo
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- CN104318004A CN104318004A CN201410556961.0A CN201410556961A CN104318004A CN 104318004 A CN104318004 A CN 104318004A CN 201410556961 A CN201410556961 A CN 201410556961A CN 104318004 A CN104318004 A CN 104318004A
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Abstract
The invention discloses a deformation-data-based bending moment internal force analysis method for a secondary lining structure of a tunnel, and relates to a bending moment internal force analysis method. According to the method, a practical deformation curve is used for inversely analyzing a bending moment internal force value of the secondary lining structure of the tunnel, so that the problem of great difference, caused by greater difference between a calculated parameter of a rock-soil body of the tunnel and a practical parameter, between a force analysis result of the structure of the tunnel and practical force in a conventional technical method can be effectively solved, and objectively, an internal force distribution state of the secondary lining structure of the tunnel can be effectively and truthfully reflected by bending moment internal force obtained in the technical scheme; obviously, fewer assumed conditions are involved in a method of inversely analyzing the bending moment internal force of a tunnel lining by taking the deformation data of an inner contour line of the lining as a basic parameter, and only the lining is simplified into an elastic curved beam, which is widely acknowledged and recognized; meanwhile, the deformation curve of the lining structure is a practical deformation result which can be obtained by taking the cross influence of various uncertain factors such as surrounding rock pressure, cement hydration heat and concrete shrinkage and creep and comprehensive factors into account.
Description
Technical field
What the present invention relates to is a kind of Bending Moment analytical approach, is specifically related to a kind of Bending Moment analytical approach of the Tunnel Second Lining structure based on deformation data;
Background technology
Tunnel is highway, a kind of key structures passing through Rock And Soil in railway traffic route; In current highway in China, railway tunnel, most of tunnel structure all adopts this pattern of composite lining structure, composite lining is the tunnel lining structure pattern combined by spray anchor preliminary bracing and secondary lining and therebetween water barrier, wherein sprays anchor preliminary bracing various support forms such as support of generally being put more energy into by sprayed concrete, anchor pole, bar-mat reinforcement and steel arch-shelf and combines; Secondary lining is then main based on form concrete;
The a large amount of highway that current China builds, railway tunnel are in following many decades, and can the security of its structure meet using function to the traffic trip ensureing our people will be safely a great proposition; Wherein key problem is the safety of tunnel structure, in tunnel structure, secondary liner structure is as the important component part of composite lining, is particularly direct basis and the evaluation basis of evaluation and analysis structural safety in operation its stress interim and internal force distribution;
Adopt which kind of method, the distribution of the internal force distribution obtaining secondary liner structure how can be quick, safe, reliable and effective particularly internal force moment of flexure is one of hot issue of being concerned about the most of China and even world tunnels and underground engineering researcher and even practitioner;
The internal force condition of existing analysis tunnel lining structure, comprise Bending moment distribution, mainly through numerical analysis methods such as finite element method, method of finite difference and boundary element methods, comprise load-structure method, floor structure methods method etc., analyzed by the numerical model setting up tunnel structure;
At present when the internal forces distribution computational analysis carrying out tunneling and underground engineering secondary lining, generally select load-structure model; Specify in vcehicular tunnel design specifications: the integral tunnel lining in deep tunnel, the entirety in shallow tunnel or composite lining and open cut tunnel lining cutting etc. should adopt load structure method to calculate; In deep tunnel, the secondary lining of composite lining also can adopt load structure method to calculate; Its fundamental assumption is:
Because tunnel is long fine texture, plane strain model analysis should be adopted; Assuming that lining cutting is small deformation elastic beam, lining cutting is enough multiple discrete equal thickness beam elements; Simulate the interaction of country rock and structure with the spring unit be arranged on each node of model, spring unit does not bear pulling force, and tension is by Automatic-falling; The local deformation theory that the elasticity coefficient of spring is assumed to basis by Winkler is determined, the general elasticity resisting coefficient K value adopting stratum, then calculate model configuration and stratum interact between the elasticity coefficient of spring;
Then computation and analysis is carried out according to the corresponding rock-soil layer physical and mechanical parameter of the selection of geologic prospecting;
There is following problem or defect in the above-mentioned technical method related to:
1. the business finite element softwares such as ANSYS, FALC, Midas-GTS are extensively adopted to carry out numerical simulation design and construct significant in considering engineering design and analyzing, but it must be noted that the result of numerical simulation is very large by the impact of initial Geotechnical Parameter input, and be stored in its uncertainty in Rock And Soil medium because tunnel is composed exactly, make the reliability of the result of calculation of secondary lining and rationality become fuzzyyer;
2. adopt numerical simulation software to calculate lining cutting modeling comparatively loaded down with trivial details, processing procedure is comparatively complicated, causes analysis efficiency not high simultaneously;
3. secondary liner structure is in actual use because the cross-synthesis be subject to due to various uncertain factors such as pressure from surrounding rock, hydration heat of cement, concrete shrinkage and creeps affects, and simple adopts that above-mentioned to mention that load-structure method carries out numerical simulation be the actual forced status being difficult to truly reflect liner structure;
In sum due to the uncertainty of the engineering geology in tunnel, country rock constitutive relation and construction factor etc., cause adopt method for numerical simulation to obtain tunnel structure result of calculation still can not as the direct basis of design and analysis;
Carrying out field measurement by burying sensor underground, is the important method accurately understanding Tunnel Second Lining concrete strain and stressing conditions; During highway tunnel construction, because of excavation and support action, country rock receives certain disturbance, and stresses re-distribution phenomenon is obvious; The stability of construction time liner structure directly affects safety for tunnel engineering; If select typical section to carry out lining concrete ess-strain measurement (as Fig. 1) in the construction time, the firsthand information comparatively accurately can be obtained;
Sensor element embedding in tunnel-liner is divided into usually: steel chord type stress strain gauge and the large class of optical fiber sensor (as Fig. 2) two; The relevant data sent by data acquisition system (DAS) acquisition sensor is obtained, such as steel string type sensor obtains the changing value of corresponding power by frequency change, and optical fiber sensor is by monitoring FBG (fiber grating) wavelength variations, obtain structural stress strain situation;
Although adopt embedding sensor to carry out obtaining internal force distribution and the rule of tunnel lining structure, be a kind of important method of accurate understanding tunnel lining concrete stressing conditions, the shortcoming of the method is fairly obvious:
1. bury this method of sensor survey stress underground and mainly contain the features such as expense is more more, installation is complicated, often on-the-spot general only as the selective-test item of monitoring measurement in tunnel;
2. need the section of monitoring must bury underground before lining construction, monitoring section limited amount, there is the interference to construction;
3. wherein adopt steel chord type strain gauge, its data stability is poor, and chronicity can not meet, and the end of a thread of sensor is easy to suffer artificial destruction, and cannot measure long-term operation tunnel;
4. wherein adopt optical fiber sensor, data stability is better, and chronicity is also passable, but due to its expense very expensive, the arbitrary cross-section internal force Bending moment distribution obtaining tunnel cannot be met;
Summary of the invention
For the deficiency that prior art exists, the present invention seeks to the Bending Moment analytical approach being to provide a kind of Tunnel Second Lining structure based on deformation data, for existing analysis tunnel lining structure method such as finite element, can objectively avoid relating to enclose Mechanics Parameters of Rock Mass inaccurate cause tunnel-liner internal force analysis result and actual internal force status widely different, the situation of even distortion; Detection section can be chosen at random, its Bending Moment state is assessed to any one section in tunnel;
To achieve these goals, the present invention realizes by the following technical solutions: based on the Bending Moment analytical approach of the Tunnel Second Lining structure of deformation data, its method step is: (1) is after Tunnel Second Lining completes, measure by application total powerstation or transit unwrapping wire on current tunnel section ground the point belonged on the axis of this lining section, this point is unique;
(2) tunnel laser profiler is erected at above this point on the midline position in this pile No., is set to an A;
(3) unwrapping wire goes out in addition a bit and then on tunnel axis, is set to a B, and this B and the profiler in step (2) set ups some A should too far apart from, and distance is within 5 meters;
(4) make A point and B point point-blank, then by laser cross section instrument half-twist, so just guarantee that the section of monitoring can make it consistent with the coordinate system of design section;
(5) by using the coordinate (x of tunnel laser profiler energy quick obtaining tunnel inner outline each point
i, z
i), wherein x
i, z
imiddle i is the numbering on tunnel inner outline measuring point, and the numbering of section can increase along with the measuring point number of the laser cross section instrument of instrument user setting; Automatic measurement section (50 points) of current laser cross section instrument, only need 3 minutes, detection time is very fast;
(5) by coordinate points (x
i, z
i) substitute into formula
calculate, the secondary lining inner outline radius of detection can be obtained; Then the radius value of this detection is added the half of secondary lining thickness, namely obtain having applied the radius on the lining cutting center line of rear reality;
(6) based on the form of Tunnel Second Lining as curved beam, by the calculation of Bending Moment formula that the theoretical value R obtaining the actual center line radius of lining cutting and lining cutting center line substitutes into curved beam, a certain measuring point moment M on this detection section can be obtained
i;
(7) moment of each measuring point is carried out line, just can obtain the moment of whole lining cutting;
(8) a period of time after tunnel is completed, employing said method after same test section is tested, can obtain the Bending Moment changes values of this Tunnel Second Lining to this tunnel of examination and analysb;
The present invention utilizes the Bending Moment value of two lining structures in actual deformation curve back analysis tunnel, effectively prevent existing technical method, to relate to rock mass in tunnel parameter inaccurate and cause analyzing the stressed and larger problem of real gap of tunnel structure analysis, and the Bending Moment objectively obtained in the technical program can reflect the internal force distribution of Tunnel Second Lining structure effectively, really; Obviously with the method that lining cutting inner outline deformation data is based on deformation data back analysis tunnel-liner Bending Moment, because assumed condition is few, be only be reduced to curved elastic beam to liner structure, this some hypothesis extensively admits and approves; Simultaneously liner structure deformation data curve be can consider the cross influence of the various uncertain factors such as pressure from surrounding rock, hydration heat of cement, concrete shrinkage and creep and composite factor obtain practical distortion result.
Accompanying drawing explanation
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is two lining point layout figure in background technology of the present invention.
Fig. 2 is FBG (fiber grating) the sensor monitoring system figure in background technology of the present invention.
Embodiment
The technological means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further;
This embodiment is by the following technical solutions: based on the Bending Moment analytical approach of the Tunnel Second Lining structure of deformation data, its method step is: (1) is after Tunnel Second Lining completes, measure by application total powerstation or transit unwrapping wire on current tunnel section ground the point belonged on the axis of this lining section, this point is unique;
(2) tunnel laser profiler is erected at above this point on the midline position in this pile No., is set to an A;
(3) unwrapping wire goes out in addition a bit and then on tunnel axis, is set to a B, and this B and the profiler in step (2) set ups some A should too far apart from, and distance is within 5 meters;
(4) make A point and B point point-blank, then by laser cross section instrument half-twist, so just guarantee that the section of monitoring can make it consistent with the coordinate system of design section; Above-mentioned 4 steps guarantee that the section that tunnel laser profiler measures can be consistent with the tunnel cross-section coordinate system of design.
(5) by using the coordinate (x of tunnel laser profiler energy quick obtaining tunnel inner outline each point
i, z
i), wherein x
i, z
imiddle i is the numbering on tunnel inner outline measuring point, and the numbering of section can increase along with the measuring point number of laser cross section instrument; Automatic measurement section (50 points) of current laser cross section instrument, only need 3 minutes, detection time is very fast;
(6) by coordinate points (x
i, z
i) substitute into formula calculate, the secondary lining inner outline radius r of detection can be obtained
i; Then this detection radius value of acquisition is added the half of secondary lining thickness, namely obtain having applied the radius R on the lining cutting center line of rear reality
1;
(7) based on tunnel-liner as curved beam form, will R be obtained
1compare with the theoretical value R of lining cutting center line, adopt the calculation of Bending Moment formula of curved beam
a certain measuring point moment M on this detection section can be obtained
i, be the moment of this measuring point in formula, E is the concrete elastic modulus of secondary lining, and I is the cross sectional moment of inertia of the every linear meter(lin.m.) of Tunnel Second Lining; E, I are can be directly obtain from the feature of material physical dimension itself;
(8) moment of each measuring point is carried out line, just can obtain the moment of whole lining cutting;
(9) a period of time after tunnel is completed, employing said method after same test section is tested, can obtain the Bending Moment changes values of this Tunnel Second Lining to this tunnel of examination and analysb;
This embodiment can for the tunnel lining structure safety analysis of operation phase with assessment, application the method can obtain the Bending Moment distribution of secondary liner structure fast, obtain the weak link of liner structure very intuitively, mechanical foundation and foundation are provided for the liner structure using state quick and precisely assessing existing tunnel.
This embodiment method, owing to being by tunnel laser profiler, within the inner outline detecting certain section only needs 5 minutes, particularly in operation tunnel, can reduce the time of road occupying close traffic as much as possible.
This embodiment can be monitored the distortion of Tunnel Second Lining section for a long time, namely can obtain the Bending Moment distribution of Tunnel Second Lining for a long time, effectively can avoid the problem that such as cannot measure forces in lining structure in the longer and component failure of lining cutting embedded set stress, strain transducer life period.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention; The technician of the industry should understand, the present invention is not restricted to the described embodiments, what describe in above-described embodiment and instructions just illustrates principle of the present invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention; Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (1)
1. based on the Bending Moment analytical approach of the Tunnel Second Lining structure of deformation data, it is characterized in that, its method step is: (1) is after Tunnel Second Lining completes, measure by application total powerstation or transit unwrapping wire on current tunnel section ground the point belonged on the axis of this lining section, this point is unique;
(2) tunnel laser profiler is erected at above this point on the midline position in this pile No., is set to an A;
(3) unwrapping wire goes out in addition a bit and then on tunnel axis, is set to a B, and this B and the profiler in step (2) set ups some A should too far apart from, and distance is within 5 meters;
(4) make A point and B point point-blank, then by laser cross section instrument half-twist, so just guarantee that the section of monitoring can make it consistent with the coordinate system of design section; Above-mentioned 4 steps guarantee that the section that tunnel laser profiler measures can be consistent with the tunnel cross-section coordinate system of design.(5) tunnel laser profiler is utilized angularly to measure current section, the coordinate (x of the analysis software energy quick obtaining tunnel inner outline each point carried by using tunnel laser profiler
i, z
i), wherein x
i, z
imiddle i is the numbering on tunnel inner outline measuring point, and the numbering of section can increase along with the measuring point number of laser cross section instrument; Automatic measurement section (50 points) of current laser cross section instrument, only need 3 minutes, detection time is very fast;
(6) by coordinate points (x
i, z
i) substitute into formula
calculate, the secondary lining inner outline radius that each detects measuring point can be obtained; Then just this radius value adds the half of lining thickness, namely obtains the radius on actual lining cutting center line;
(7) based on tunnel-liner as curved beam form, the theoretical value R of the actual lining cutting center line radius and the lining cutting center line that obtain is compared, the calculation of Bending Moment formula of employing curved beam, a certain measuring point moment M on this detection section can be obtained
i, in calculation of Bending Moment formula, E is the concrete elastic modulus of secondary lining, and I is the cross sectional moment of inertia of Tunnel Second Lining longitudinal every linear meter(lin.m.) along tunnel; E, I can be all directly obtain from the feature of material physical dimension itself;
(8) according to step (7), the moment obtaining each measuring point is carried out line, just can obtain the moment to the secondary lining of vault to tunnel side wall;
(9) a period of time after tunnel is completed, employing said method after same test section is tested, can obtain the Bending Moment changes values of this Tunnel Second Lining to this tunnel of examination and analysb.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106930775A (en) * | 2017-02-22 | 2017-07-07 | 宁波交通工程建设集团有限公司 | The firm structure building enclosure of shallow embedding mountain highway tunnel gate-type campshed and its construction method |
| CN109460589A (en) * | 2018-10-22 | 2019-03-12 | 西南交通大学 | It is a kind of based on the Tunnel dynamic design approach of deformation-Structure Method |
| CN109740251A (en) * | 2018-12-30 | 2019-05-10 | 中铁十四局集团有限公司 | Selection method, device, memory and the processor of the parameter of secondary lining |
| CN109885911A (en) * | 2019-01-31 | 2019-06-14 | 中铁第四勘察设计院集团有限公司 | Composite lining of tunnel design method including secondary lining under more load actions |
| CN110398784A (en) * | 2019-08-07 | 2019-11-01 | 中铁四局集团第四工程有限公司 | A kind of Tunnel Passing fault belt Assessment of Surrounding Rock Stability method |
| CN110671128A (en) * | 2019-09-19 | 2020-01-10 | 中铁第四勘察设计院集团有限公司 | Method for evaluating mechanical state of secondary lining of mine tunnel |
| CN111596375A (en) * | 2020-04-23 | 2020-08-28 | 上海同岩土木工程科技股份有限公司 | Method and device for detecting occurrence state of underground water behind lining |
| CN112818445A (en) * | 2021-01-25 | 2021-05-18 | 中铁第四勘察设计院集团有限公司 | Method and device for testing mechanical response of deep-buried isobaric circular composite lining tunnel |
| CN113591250A (en) * | 2021-08-11 | 2021-11-02 | 中铁隧道局集团有限公司 | Calculation method for cracked lining bearing capacity |
| CN114485449A (en) * | 2022-02-08 | 2022-05-13 | 上海市地质勘查技术研究院 | Tunnel longitudinal distributed deformation monitoring method and system based on optical fiber sensing technology |
| CN114894109A (en) * | 2022-02-09 | 2022-08-12 | 重庆交通大学 | Tunnel strain information acquisition method and related device |
| CN115235366A (en) * | 2022-07-20 | 2022-10-25 | 福州大学 | Tunnel structure safety evaluation method based on inner contour curvature change |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106930775B (en) * | 2017-02-22 | 2019-10-25 | 宁波交通工程建设集团有限公司 | The rigid structure building enclosure of shallow embedding mountain highway tunnel gate-type campshed and its construction method |
| CN106930775A (en) * | 2017-02-22 | 2017-07-07 | 宁波交通工程建设集团有限公司 | The firm structure building enclosure of shallow embedding mountain highway tunnel gate-type campshed and its construction method |
| CN109460589A (en) * | 2018-10-22 | 2019-03-12 | 西南交通大学 | It is a kind of based on the Tunnel dynamic design approach of deformation-Structure Method |
| CN109460589B (en) * | 2018-10-22 | 2022-10-21 | 西南交通大学 | Tunnel primary support dynamic design method based on deformation-structure method |
| CN109740251A (en) * | 2018-12-30 | 2019-05-10 | 中铁十四局集团有限公司 | Selection method, device, memory and the processor of the parameter of secondary lining |
| CN109740251B (en) * | 2018-12-30 | 2023-07-07 | 中铁十四局集团有限公司 | Method and device for selecting parameters of secondary lining, memory and processor |
| CN109885911B (en) * | 2019-01-31 | 2022-04-01 | 中铁第四勘察设计院集团有限公司 | Tunnel composite lining design method including secondary lining under multi-load action |
| CN109885911A (en) * | 2019-01-31 | 2019-06-14 | 中铁第四勘察设计院集团有限公司 | Composite lining of tunnel design method including secondary lining under more load actions |
| CN110398784A (en) * | 2019-08-07 | 2019-11-01 | 中铁四局集团第四工程有限公司 | A kind of Tunnel Passing fault belt Assessment of Surrounding Rock Stability method |
| CN110671128B (en) * | 2019-09-19 | 2020-12-29 | 中铁第四勘察设计院集团有限公司 | Method for evaluating mechanical state of secondary lining of mine tunnel |
| CN110671128A (en) * | 2019-09-19 | 2020-01-10 | 中铁第四勘察设计院集团有限公司 | Method for evaluating mechanical state of secondary lining of mine tunnel |
| CN111596375A (en) * | 2020-04-23 | 2020-08-28 | 上海同岩土木工程科技股份有限公司 | Method and device for detecting occurrence state of underground water behind lining |
| CN111596375B (en) * | 2020-04-23 | 2023-03-28 | 上海同岩土木工程科技股份有限公司 | Method and device for detecting occurrence state of underground water behind lining |
| CN112818445B (en) * | 2021-01-25 | 2022-03-22 | 中铁第四勘察设计院集团有限公司 | Method and device for testing mechanical response of deep-buried isobaric circular composite lining tunnel |
| CN112818445A (en) * | 2021-01-25 | 2021-05-18 | 中铁第四勘察设计院集团有限公司 | Method and device for testing mechanical response of deep-buried isobaric circular composite lining tunnel |
| CN113591250B (en) * | 2021-08-11 | 2023-03-17 | 中铁隧道局集团有限公司 | Calculation method for cracked lining bearing capacity |
| CN113591250A (en) * | 2021-08-11 | 2021-11-02 | 中铁隧道局集团有限公司 | Calculation method for cracked lining bearing capacity |
| CN114485449A (en) * | 2022-02-08 | 2022-05-13 | 上海市地质勘查技术研究院 | Tunnel longitudinal distributed deformation monitoring method and system based on optical fiber sensing technology |
| CN114894109A (en) * | 2022-02-09 | 2022-08-12 | 重庆交通大学 | Tunnel strain information acquisition method and related device |
| CN114894109B (en) * | 2022-02-09 | 2023-10-17 | 重庆交通大学 | Tunnel strain information acquisition method and related device |
| CN115235366A (en) * | 2022-07-20 | 2022-10-25 | 福州大学 | Tunnel structure safety evaluation method based on inner contour curvature change |
| CN115235366B (en) * | 2022-07-20 | 2024-06-07 | 福州大学 | Tunnel structure safety assessment method based on inner contour curvature change |
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Application publication date: 20150128 |