CN205175392U - Tunnel earth's surface settlement monitoring device based on distributed optical fiber sensing - Google Patents
Tunnel earth's surface settlement monitoring device based on distributed optical fiber sensing Download PDFInfo
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- CN205175392U CN205175392U CN201520892811.7U CN201520892811U CN205175392U CN 205175392 U CN205175392 U CN 205175392U CN 201520892811 U CN201520892811 U CN 201520892811U CN 205175392 U CN205175392 U CN 205175392U
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Abstract
The utility model relates to a tunnel earth's surface settlement monitoring device based on distributed optical fiber sensing, tunnel earth's surface settlement monitoring device based on distributed optical fiber sensing include distributed optical fiber, set up at the datum point apart from tunnel axis probe distance 3~5 times of tunnel hole footpaths and use tunnel axis to be a plurality of monitoring points of symmetry form even spacing distribution as the axle, datum point and monitoring point all are provided with the mounting base, and distributed optical fiber sets up and is linked together in the mounting base of datum point and monitoring point and with datum point and monitoring point. The utility model provides a tunnel earth's surface settlement monitoring device based on distributed optical fiber sensing that maneuverability is strong and the cost is lower.
Description
Technical field
The utility model belongs to Tunnel Engineering Field Monitoring Technique field, relates to a kind of Characters in Tunnel Surface Settlement monitoring device based on distributing optical fiber sensing.
Background technology
The continuous propelling of the constantly perfect and Midwest Great developing strategy built along with national highway net, highway progressively strides forward to area, high and steep mountains, shallow embedding, bias voltage, large cross-section tunnel also get more and more thereupon, and the situation of the unfavorable geologies such as Soft Rock Tunnel, landslide, karst also gets more and more, its stability of surrounding rock in work progress will face great challenge.Meanwhile, China's urban subway tunnel also gets more and more in recent years, its inevitably face pass through surface buildings compact district, with the complex situations such as the crossings on different level of existing underground structure closely connects, it is higher to the requirement of surface settlement control in work progress.Because tunnel excavation will extend to earth's surface place to the stress disturbance of country rock, the stress-strain state of country rock directly will be reflected in ground settlement, is therefore extremely important to the monitoring of ground settlement in constructing tunnel process.
At present, Characters in Tunnel Surface Settlement monitoring is main adopts conventional engineering monitoring means, namely lays reference point and monitoring point on earth's surface, tunnel, utilize precision level and indium steel ruler to measure, then computational analysis draws the settling amount of each monitoring point.In practical engineering application, conventional means is adopted mainly to face following three aspect problems to Characters in Tunnel Surface Settlement monitoring:
1) scope of application has certain limitation.Existing surface subsidence monitoring method mainly contains levelling process, trigonometric leveling, but these two kinds of methods have intervisibility requirement, very easily by the restriction of topographic condition, especially at the mountainous terrain of earth's surface height big rise and fall, it is very big that it measures difficulty, and measuring accuracy is difficult to ensure; And when tunnel surface vegetation is luxuriant, conventional surface subsidence monitoring means almost cannot be carried out the work.
2) observation process is wasted time and energy.Routine monitoring means need people's movements and postures of actors chi, reading, record, and when monitoring point quantity is more, its observation process needs the manpower of at substantial; Especially, when weather is comparatively severe, monitoring difficulty is very big.
3) automatic monitoring and early warning cannot be realized.Existing monitoring means cannot complete lasting, continual surface subsidence monitoring, feedback monitoring data that cannot be dynamic, real-time, therefore cannot realize the monitoring and warning to Characters in Tunnel Surface Settlement, be unfavorable for the whole process analysis of Characters in Tunnel Surface Settlement, very easily omit dangerous situation.Given this, consider from the aspect such as monitoring effect, economic benefit, existing surface subsidence monitoring technology can not adapt to the development that Tunnel Engineering is built.
Utility model content
The utility model for Problems existing in existing tunnel surface subsidence monitoring technology, and then provides a kind of workable and lower-cost Characters in Tunnel Surface Settlement monitoring device based on distributing optical fiber sensing.
The purpose of this utility model is realized by following technological means:
Based on a Characters in Tunnel Surface Settlement monitoring device for distributing optical fiber sensing, it is characterized in that: the described Characters in Tunnel Surface Settlement monitoring device based on distributing optical fiber sensing comprises distribution type fiber-optic, be arranged on apart from the reference point in tunnel axis horizontal range 3 ~ 5 times of Tunnel footpaths and take tunnel axis as axle symmetrically multiple monitoring points of equidistantly distributing of shape; Described reference point and monitoring point are provided with mounting base, and described distribution type fiber-optic to be arranged in the mounting base of reference point and monitoring point and to be connected with monitoring point by reference point.
As preferably, the mounting base that the utility model adopts comprises concrete bed, fixed support, sleeve pipe and hollow circular-tube; Described casing pipe sleeve is contained in hollow circular-tube outside; The tube wall of described sleeve pipe is connected with concrete bed by fixed support; The inwall of described hollow circular-tube offers the first groove, the second groove and the 3rd groove; Angle between described first groove and the second groove and the 3rd groove is 180 ° and 90 ° respectively; A distribution type fiber-optic is laid with in described first groove, the second groove and the 3rd groove.
As preferably, the mounting base that the utility model adopts also comprises the epoxide-resin glue be filled in hollow circular-tube and the only plug being arranged on hollow circular-tube both ends.
As preferably, the longitudinal cross-section of the concrete bed that the utility model adopts is trapezoidal, the upper bottom side length of described concrete bed is not more than 40cm, the bottom of described concrete bed is failed to grow up in 20cm, the height of described concrete bed is not more than 50cm, and the buried depth of described concrete bed is not less than 1.5m.
As preferably, the length of the hollow circular-tube that the utility model adopts is not more than 10cm, the external diameter of described hollow circular-tube is not more than 6cm, the internal diameter of described hollow circular-tube is not more than 5cm, and the cross sectional dimensions of the first groove that described hollow circular-tube inwall is offered, the second groove and the 3rd groove is 3mm × 3mm.
As preferably, the distribution type fiber-optic that the utility model adopts is hard-pressed bale sheath straining and sensing optical cable, is packaged with polyurethane elastomeric materials protective seam outside the fibre core of described distribution type fiber-optic, and the diameter of described distribution type fiber-optic is 2mm, and weight is 2kg/km.
The utility model is compared with existing monitoring technology, and its remarkable advantage is:
The utility model provides a kind of Characters in Tunnel Surface Settlement monitoring device based on distributing optical fiber sensing, this monitoring device mainly comprises reference point, distribution type fiber-optic, monitoring point, and wherein reference point mainly comprises concrete bed, fixed support, sleeve pipe, hollow circular-tube, epoxide-resin glue, only plug.Reference point is laid in the position apart from tunnel axis horizontal range 3 ~ 5 Bei Dong footpath; Monitoring point with tunnel axis be axle symmetrically shape equidistantly distribute; Fixed support and concrete bed is provided with below sleeve pipe; Hollow circular-tube is fixed on inside pipe casing; Be provided with 3 grooves inside hollow circular-tube, in each groove, lay 1 distribution type fiber-optic; Hollow circular-tube two ends are provided with only plug; Epoxide-resin glue is injected in hollow circular-tube inside, distribution type fiber-optic and hollow circular-tube is bonded as one.By measuring the strain value of distribution type fiber-optic, can determine that the relative distance between each monitoring point and reference point changes, and then realizing online, dynamic, the Real-Time Monitoring of Characters in Tunnel Surface Settlement.Specifically, the utility model has the following advantages: the automatic monitoring that 1) can realize Characters in Tunnel Surface Settlement, greatly improves monitoring efficiency, saves manpower, and can feed back ground settlement information in real time, dynamically, realizes the early warning to ground settlement; 2) by force, be not subject to working environment and artificial impact, its monitoring accuracy is higher for good operating stability of the present utility model, applicability; 3) the utility model implementation step is simple, workable, cost is lower, has good economic results in society and promotional value.
Accompanying drawing explanation
Fig. 1 is Characters in Tunnel Surface Settlement monitoring device structural representation provided by the utility model;
The reference point structural representation that Fig. 2 adopts for the utility model;
The hollow circular-tube that Fig. 3 adopts for the utility model and distribution type fiber-optic structural representation;
The calculation of ground surface settlement model schematic that Fig. 4 adopts for the utility model;
Description of reference numerals is as follows:
1-reference point; 2-distribution type fiber-optic; 3-monitoring point; 4-concrete bed; 5-fixed support; 6-sleeve pipe; 7-hollow circular-tube; 8-stops plug; 9-epoxide-resin glue; 10-groove; 11-1 optical fiber; 12-2 optical fiber; 13-3 optical fiber.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, device of the present utility model is described in further detail:
See Fig. 1, Fig. 2 and Fig. 3, the utility model provides a kind of Characters in Tunnel Surface Settlement monitoring device based on distributing optical fiber sensing, and this device mainly comprises reference point 1, distribution type fiber-optic 2, monitoring point 3; Reference point 1 mainly comprises concrete bed 4, fixed support 5, sleeve pipe 6, hollow circular-tube 7, only plug 8 and epoxide-resin glue 9, and reference point 1 is laid in the position apart from tunnel axis horizontal range 3 ~ 5 Bei Dong footpath; Monitoring point 3 with tunnel axis be axle symmetrically shape equidistantly distribute; Fixed support 5 and concrete bed 4 is provided with below sleeve pipe 6; It is inner that hollow circular-tube 7 is fixed on sleeve pipe 6, the inwall of hollow circular-tube 7 is provided with 3 grooves 10 (the first groove, the second groove and the 3rd groove), angle between first groove and second groove, the 3rd groove is respectively 180 °, 90 °, lays 1 distribution type fiber-optic 2 in each groove 10; Hollow circular-tube 7 two ends are provided with only plug 8; Epoxide-resin glue 9 is injected in hollow circular-tube 7 inside, distribution type fiber-optic 2 and hollow circular-tube 7 is bonded as one.
Distribution type fiber-optic 2 is hard-pressed bale sheath straining and sensing optical cable, uses polyurethane elastomeric materials packaging protection outside its fibre core, and this optic cable diameter is 2mm, and weight is 2kg/km.
Concrete bed 4 longitudinal cross-section is trapezoidal, and upper bottom side length is 40cm, and the length of side of going to the bottom is 20cm, and be highly 50cm, its buried depth is not less than 1.5m.
Hollow circular-tube 7 length is 10cm, and external diameter is 6cm, and internal diameter is 5cm, is provided with 3 grooves 10 inside it, and groove 10 cross sectional dimensions is 3mm × 3mm; When laying distribution type fiber-optic 2 in groove 10, should ensure that the line of No. 1 optical fiber 11, No. 2 optical fiber 12 is vertical with No. 3 optical fiber 13.
Form of construction work of the present utility model is:
A (), at the earth's surface place excavation pit apart from tunnel axis horizontal range 3 ~ 5 Bei Dong footpath, casting concrete base 4, and mounting and fixing bracket 5, subsequently at fixed support 5 upper weld sleeve pipe 6;
B hollow circular-tube 7 is fixed on sleeve pipe 6 by () inner, should ensure that hollow circular-tube 7 and sleeve pipe 6 bond firmly;
C 3 distribution type fiber-optics 2 embed in 3 grooves 10 in hollow circular-tube 7 by () respectively, install only plug 8 at hollow circular-tube 7 two ends, and inject epoxide-resin glue 9 to hollow circular-tube 7 inside, and reference point 1 has been laid;
D () lays monitoring point 3 according to step (a) ~ (c), make monitoring point 3 with tunnel axis be axle symmetrically shape equidistantly distribute.
As shown in Figure 4, when a certain monitoring point produces with stratum, 3 fiber-optic monitorings to strain value be respectively ε
1(x), ε
2(x), ε
3x (), because fibre strain value ε (x) is axial strain ε
a(x) and bending strain ε
b(x) sum, that is:
ε(x)＝ε
a(x)+ε
b(x)(1)
Can obtain according to geometric relationship:
ε
b(x)＝-Rcos(θ)/ρ(x)(2)
Wherein x is certain some horizontal range to reference point on optical fiber; R is hollow circular-tube external diameter, and θ is the angle between 1, No. 2 optical fiber line and horizontal direction, the radius-of-curvature that ρ (x) is fibre-optical bending.
Because ε (x) is with ε
a(x) for axle be cosine fluctuation, and 1, No. 2 optical fiber symmetrically shape distribution, therefore can obtain:
Because No. 3 optical fiber are vertical with 1, No. 2 optical fiber line, then:
According to formula (5) known ε
1(x), ε
3x () is mutual remaining relation, then angle theta is:
The vertical displacement Δ H of certain monitoring point is:
In formula, L is the horizontal range between certain monitoring point and reference point; Therefore, formula (2), formula (6) are substituted into the subsidence value that can draw certain monitoring point in formula (7).
What finally illustrate is, above embodiment is only in order to illustrate the technical solution of the utility model and unrestricted, although be described in detail the utility model with reference to most preferred embodiment, those of ordinary skill in the art is to be understood that, can modify to the technical solution of the utility model or equivalent replacement, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of right of the present utility model.
Claims (6)
1. based on a Characters in Tunnel Surface Settlement monitoring device for distributing optical fiber sensing, it is characterized in that: the described Characters in Tunnel Surface Settlement monitoring device based on distributing optical fiber sensing comprises distribution type fiber-optic, be arranged on apart from the reference point in tunnel axis horizontal range 3 ~ 5 times of Tunnel footpaths and take tunnel axis as axle symmetrically multiple monitoring points of equidistantly distributing of shape; Described reference point and monitoring point are provided with mounting base, and described distribution type fiber-optic to be arranged in the mounting base of reference point and monitoring point and to be connected with monitoring point by reference point.
2. the Characters in Tunnel Surface Settlement monitoring device based on distributing optical fiber sensing according to claim 1, is characterized in that: described mounting base comprises concrete bed, fixed support, sleeve pipe and hollow circular-tube; Described casing pipe sleeve is contained in hollow circular-tube outside; The tube wall of described sleeve pipe is connected with concrete bed by fixed support; The inwall of described hollow circular-tube offers the first groove, the second groove and the 3rd groove; Angle between described first groove and the second groove and the 3rd groove is 180 ° and 90 ° respectively; A distribution type fiber-optic is laid with in described first groove, the second groove and the 3rd groove.
3. the Characters in Tunnel Surface Settlement monitoring device based on distributing optical fiber sensing according to claim 2, is characterized in that: described mounting base also comprises the epoxide-resin glue be filled in hollow circular-tube and the only plug being arranged on hollow circular-tube both ends.
4. the Characters in Tunnel Surface Settlement monitoring device based on distributing optical fiber sensing according to claim 3, it is characterized in that: the longitudinal cross-section of described concrete bed is trapezoidal, the upper bottom side length of described concrete bed is not more than 40cm, the bottom of described concrete bed is failed to grow up in 20cm, the height of described concrete bed is not more than 50cm, and the buried depth of described concrete bed is not less than 1.5m.
5. the Characters in Tunnel Surface Settlement monitoring device based on distributing optical fiber sensing according to claim 4, it is characterized in that: the length of described hollow circular-tube is not more than 10cm, the external diameter of described hollow circular-tube is not more than 6cm, the internal diameter of described hollow circular-tube is not more than 5cm, and the cross sectional dimensions of the first groove that described hollow circular-tube inwall is offered, the second groove and the 3rd groove is 3mm × 3mm.
6. the Characters in Tunnel Surface Settlement monitoring device based on distributing optical fiber sensing according to the arbitrary claim of claim 1-5; it is characterized in that: described distribution type fiber-optic is hard-pressed bale sheath straining and sensing optical cable; polyurethane elastomeric materials protective seam is packaged with outside the fibre core of described distribution type fiber-optic; the diameter of described distribution type fiber-optic is 2mm, and weight is 2kg/km.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520892811.7U CN205175392U (en) | 2015-11-10 | 2015-11-10 | Tunnel earth's surface settlement monitoring device based on distributed optical fiber sensing |
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|---|---|---|---|
| CN201520892811.7U CN205175392U (en) | 2015-11-10 | 2015-11-10 | Tunnel earth's surface settlement monitoring device based on distributed optical fiber sensing |
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| CN205175392U true CN205175392U (en) | 2016-04-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424000A (en) * | 2015-11-10 | 2016-03-23 | 山西省交通科学研究院 | Tunnel ground surface settlement monitoring device based on distributed optical fiber sensing and monitoring method |
| CN107356208A (en) * | 2017-07-07 | 2017-11-17 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of concrete structure health monitoring sensor based on distribution type fiber-optic |
| US20230051333A1 (en) * | 2021-08-11 | 2023-02-16 | China University Of Mining And Technology | Directional Drilling-Exploring-Monitoring Integrated Method for Guaranteeing Safety of Underwater Shield Tunnel |
-
2015
- 2015-11-10 CN CN201520892811.7U patent/CN205175392U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424000A (en) * | 2015-11-10 | 2016-03-23 | 山西省交通科学研究院 | Tunnel ground surface settlement monitoring device based on distributed optical fiber sensing and monitoring method |
| CN107356208A (en) * | 2017-07-07 | 2017-11-17 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of concrete structure health monitoring sensor based on distribution type fiber-optic |
| US20230051333A1 (en) * | 2021-08-11 | 2023-02-16 | China University Of Mining And Technology | Directional Drilling-Exploring-Monitoring Integrated Method for Guaranteeing Safety of Underwater Shield Tunnel |
| US11753935B2 (en) * | 2021-08-11 | 2023-09-12 | China University Of Mining And Technology | Directional drilling-exploring-monitoring integrated method for guaranteeing safety of underwater shield tunnel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170627 Address after: 030006 Taiyuan, Xiaodian District, Shanxi city street, No. 79 Patentee after: Shanxi Province Transport Science Research Institute Address before: 030006 Taiyuan, Xiaodian District, Shanxi city street, No. 79 Co-patentee before: Shanxi Jiaoke Highway Prospecting Design Institute Patentee before: Shanxi Province Transport Science Research Institute |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160420 Termination date: 20181110 |