CN203587095U - Device for monitoring sedimentation of tunnel by using distributed optical fibers - Google Patents

Device for monitoring sedimentation of tunnel by using distributed optical fibers Download PDF

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Publication number
CN203587095U
CN203587095U CN201320761056.XU CN201320761056U CN203587095U CN 203587095 U CN203587095 U CN 203587095U CN 201320761056 U CN201320761056 U CN 201320761056U CN 203587095 U CN203587095 U CN 203587095U
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CN
China
Prior art keywords
tunnel
monitoring
clamping groove
distributed optical
groove plate
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CN201320761056.XU
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Chinese (zh)
Inventor
丁勇
俞设
董雪花
姚庆雄
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丁勇
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Priority to CN201320761056.XU priority Critical patent/CN203587095U/en
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Publication of CN203587095U publication Critical patent/CN203587095U/en

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Abstract

The utility model discloses a device for monitoring the sedimentation of a tunnel by using distributed optical fibers. The device comprises two same monitoring units. Each monitoring unit comprises a distributed optical fiber and a clamping slot plate. The clamping slot plate is a semicircular thick plate and is provided with a chute in an arc surface so as to clamp the distributed optical fiber. The clamping slot plate is fixed on the center line of each tunnel pipe piece; a connecting line of every two adjacent clamping slot plates and the longitudinal direction of the tunnel form an included angle being 30 DEG. The distributed optical fiber is arranged in a broken line way from one end to the other end of the tunnel along the arc surface of the clamping slot plate, then, is turned to be arranged in a straight line way and returns to a starting point. The clamping slot plate and the distributed optical fiber are fixed by using an adhesive, and thus, one of the monitoring units is made. The other same monitoring unit is arranged on the tunnel pipe piece of the monitoring unit, and the two monitoring units are symmetric along the longitudinal center line of the tunnel, so that the monitoring device is made. The monitoring device disclosed by the utility model is connected with a data acquisition instrument, so that the sedimentation of a subway tunnel can be automatically monitored all the day time in real time, the sensed data and temperature are automatically compensated, the precision can be up to the mm-grade, and an alarm can be given in time when a sudden condition happens in the tunnel.

Description

The device of distributed optical fiber sensing tunnel subsidence
Technical field
The utility model relates to a kind of civil engineering work safety monitoring, is specifically related to a kind of device of distributed optical fiber sensing tunnel subsidence.
Background technology
According to statistics, there were in recent years 30 granted construction subway engineerings of city nearly.And subway engineering is built in underground Rock And Soil medium more, engineering geological condition and complicated hydrogeological conditions, have a lot of uncertainties, along with increasing or other specific factor of the operation time limit, there will be the excessive and secondary disease of sedimentation and deformation.Subway station adopts pile foundation more, and sedimentation and deformation is conventionally very little; And the interval subsoil that adopts of subway tunnel, sedimentation and deformation is relatively large, and decades even for many years, special soft clay area.
The distortion of subway tunnel Excessive Settlement is the common disease of subway sectional tunnel engineering, particularly coastal riverine soft clay area or soft or hard stratum ecotone.It can cause that structure crack, the serious faulting of slab ends in section of jurisdiction, seal failure, ground water seepage, bolt corrosion, railway roadbed come to nothing, rail recessed (subsider), tread raise the sick evil of grade that transfinites.As found not in time or early warning, probably bring out operation and rock truck in shock, hole, be subject to the security incidents such as electric bad parking.
At present the settlement observation of subway sectional tunnel is still used to common engineering survey means, along tunnel, longitudinally at interval of tens meters, an observation station is set, utilize spirit-leveling instrument or total powerstation to carry out pointwise observation, analyze as calculated the settling amount (single settling amount and accumulative total settling amount) that obtains each point, judge whether whether it transfinites, affect metro operation and influence degree thereof.
But subway tunnel is different from ground surface works, adopt common engineering survey means to be often difficult to meet the observation work of current subway tunnel sedimentation.With respect to land subsidence observation, subway tunnel settlement observation faces following problem conventionally: in (1) tunnel, sighting condition is poor.Even if be also rather dark, be unfavorable for spirit-leveling instrument or total powerstation observation under the condition of turning on light.(2) in hole, " time window " of observation is of short duration.Subway belongs to " enclosure space ", and the non-stoppage in transit period must not enter, and generally can only just permit entering at 1:00 AM to 4.(3) in hole observation can only pass through continuity carry out.In hole, all belong to sedimentation and deformation district, unlike ground, several reference points can be set along the line, can carry out by multistage.(4) in hole, settlement observation branch is carried out.The common 20-40 rice of settlement observation dot spacing, can be encrypted to 10 meters under specified conditions.Observation station may not necessarily be arranged on sedimentation maximum point place simultaneously.(5) each observation time continues longer.Subway tunnel interval mostly is 1km left and right, and once observation needs 2-3 days.(6) even if current automatic monitoring (" robot measurement " or static level observation) is also that fixing observation station (tens meters to tens meters of spacing) is observed, invest hugely, be also to carry out continuity settlement observation along the line simultaneously.In view of These characteristics, subway tunnel settlement observation is at present limited to the interval paragraph that has been found that obvious sedimentation disease more, settlement observation data do not possess measuring point continuity (observation station spacing is very little) feature in the vertical, the overall understanding and the entirety that are unfavorable for sedimentation and deformation are held, and easily cause dangerous situation to be omitted.
Utility model content
The purpose of this utility model is to provide a kind of device of distributed optical fiber sensing tunnel subsidence, by use have that precision is high, good endurance, Distributed Optical Fiber Sensing Techniques that anti-electromagnetic interference (EMI) is good, realize subway tunnel round-the-clock in real time automatically settlement monitoring and emergency case and alarm.
The technical solution that realizes the utility model object is:
Monitoring device comprises two identical monitoring means.Monitoring means comprises distribution type fiber-optic, clamping groove plate.Clamping groove plate is semicircle slab, and radius is at 8~10cm, and planar central has circular hole for fixing, and arc surface has skewed slot, guarantees that distribution type fiber-optic can snap in.Clamping groove plate is fixed on each tunnel duct piece center line, and adjacent two clamping groove plate lines and tunnel are longitudinally the angle of 30 °.Distribution type fiber-optic is laid along clamping groove plate arc surface from tunnel end to end broken line, turns to afterwards straight line to turn back to starting point.Clamping groove plate and distribution type fiber-optic are sticked with glue fixing, a monitoring means completes.On the tunnel duct piece of existing above-mentioned monitoring means, then arrange an identical monitoring means, make these two monitoring means along tunnel longitudinal midline symmetry, complete the making of monitoring device.
Principle of work of the present utility model and method are as follows:
When relative settlement occurs for two adjacent tunnel sections of jurisdiction, the strain data that in monitoring device, two distribution type fiber-optics monitor is respectively ε 1, ε 2, the strain data wherein producing due to temperature impact is ε t, the strain data that relative settlement generation occurs due to two adjacent tunnel sections of jurisdiction is respectively ε 1x, ε 2x.From above, can obtain ε 1t+ ε 1x, ε 2t+ ε 2x.A known section of jurisdiction length is L, and the height of a broken line of distribution type fiber-optic is H, and length is L l, according to triangle relation, there is relative settlement in above-mentioned two adjacent tunnel sections of jurisdiction x = L l 4 ( ϵ 1 - ϵ 2 ) 2 [ ( ϵ 1 - ϵ 2 ) 2 - 4 ] 4 [ L l 2 ( ϵ 1 - ϵ 2 ) 2 - 4 H 2 ] , And realize temperature self-compensation.
The utility model compared with prior art, its remarkable advantage:
1, realize the distributed Real-Time Monitoring of sedimentation in subway tunnel, realize temperature self-compensation, and used two monitoring means, monitoring accuracy can reach mm level;
2, the utility model technique is simple, easy for installation, has broad application prospects and good economic benefit;
3, realize the round-the-clock automatic monitoring of subway tunnel, if there is emergency case Realtime Alerts, guarantee safety of subway operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model monitoring device.
Fig. 2 is the structural representation of the utility model monitoring means.
Each label in figure: distribution type fiber-optic 1, clamping groove plate 2, tunnel duct piece 3.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
In conjunction with Fig. 1 and Fig. 2, monitoring device comprises two identical monitoring means.Monitoring means comprises distribution type fiber-optic 1, clamping groove plate 2.Clamping groove plate 2 is semicircle slab, and radius is at 8~10cm, and planar central has circular hole for fixing, and arc surface has skewed slot, guarantees that distribution type fiber-optic 1 can snap in.Clamping groove plate 2 is fixed on each tunnel duct piece 3 center lines, and adjacent two clamping groove plate 2 lines and tunnel are longitudinally the angle of 30 °.Distribution type fiber-optic 1 is laid along clamping groove plate 2 arc surfaces from tunnel end to end broken line, turns to afterwards straight line to turn back to starting point.Clamping groove plate 2 and distribution type fiber-optic 1 are sticked with glue fixing, a monitoring means completes.On the tunnel duct piece 3 of existing above-mentioned monitoring means, then arrange an identical monitoring means, make these two monitoring means along tunnel longitudinal midline symmetry, complete the making of monitoring device.
The installation method of monitoring device of the present utility model, comprises following step:
(a1) clamping groove plate 2 is fixed on each tunnel duct piece 3 center lines, and adjacent two clamping groove plate 2 lines and tunnel are longitudinally the angle of 30 °;
(a2) distribution type fiber-optic 1 is laid along clamping groove plate 2 arc surfaces from tunnel end to end broken line, guarantees that each broken line distribution type fiber-optic 1 is longitudinally 30 ° of angles with tunnel, turns to straight line to turn back to starting point afterwards;
(a3) clamping groove plate 2 and distribution type fiber-optic 1 are sticked with glue fixing, a monitoring means completes;
(a4) on the tunnel duct piece 3 of existing above-mentioned monitoring means, then arrange an identical monitoring means, make these two monitoring means along tunnel longitudinal midline symmetry, complete the installation of monitoring device.
Principle of work of the present utility model and method are as follows:
When relative settlement occurs in two adjacent tunnel sections of jurisdiction 3, the strain data that in monitoring device, two distribution type fiber-optics 1 monitor is respectively ε 1, ε 2, the strain data wherein producing due to temperature impact is ε t, the strain data that relative settlement generation occurs due to two adjacent tunnel sections of jurisdiction 3 is respectively ε 1x, ε 2x.From above, can obtain ε 1t+ ε 1x, ε 2t+ ε 2x.A known section of jurisdiction length is L, and the height of 1 one broken lines of distribution type fiber-optic is H, and length is L l, according to triangle relation, there is relative settlement in above-mentioned two adjacent tunnel sections of jurisdiction 3 x = L l 4 ( ϵ 1 - ϵ 2 ) 2 [ ( ϵ 1 - ϵ 2 ) 2 - 4 ] 4 [ L l 2 ( ϵ 1 - ϵ 2 ) 2 - 4 H 2 ] , And realize temperature self-compensation.
According to monitoring device of the present utility model, provide a kind of specific embodiment.
In conjunction with Fig. 1, the joint access data Acquisition Instrument of distribution type fiber-optic in monitoring device 1 is carried out to data sampling and processing and obtain strain data, and then learn that differential settlement occurs adjacent two tunnel duct pieces 3.The present embodiment can be realized tunnel duct piece 3 settlement monitoring precision and be increased to mm level.
More than show and described ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims (1)

1. a device for distributed optical fiber sensing tunnel subsidence, is characterized in that: monitoring device comprises two identical monitoring means, and monitoring means comprises distribution type fiber-optic (1), clamping groove plate (2); Clamping groove plate (2) is semicircle slab, radius is at 8~10cm, planar central has circular hole for fixing, arc surface has skewed slot, guarantee that distribution type fiber-optic (1) can snap in, clamping groove plate (2) is fixed on each tunnel duct piece (3) center line, and adjacent two clamping groove plate (2) lines and tunnel are longitudinally the angle of 30 °; Distribution type fiber-optic (1) is laid along clamping groove plate (2) arc surface from tunnel end to end broken line, turns to afterwards straight line to turn back to starting point; Clamping groove plate (2) and distribution type fiber-optic (1) are sticked with glue fixing, a monitoring means completes; Tunnel duct piece (3) at existing described monitoring means is upper, then arranges an identical monitoring means, makes these two monitoring means along tunnel longitudinal midline symmetry, completes the making of monitoring device.
CN201320761056.XU 2013-11-26 2013-11-26 Device for monitoring sedimentation of tunnel by using distributed optical fibers CN203587095U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103591930A (en) * 2013-11-26 2014-02-19 丁勇 Apparatus for monitoring settlement of tunnel through distributed fiber, and method thereof
CN104316024A (en) * 2014-10-09 2015-01-28 中国人民解放军国防科学技术大学 Simple cascading camera chain measuring method and system for monitoring multipoint settlement
CN104501773A (en) * 2014-12-16 2015-04-08 河海大学 Device and method for monitoring vertical deformation of hydraulic construction
CN104501772A (en) * 2014-12-16 2015-04-08 河海大学 Device and method for monitoring differential settlement in portfolio for soil-stone combined region with hydraulic structure

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103591930A (en) * 2013-11-26 2014-02-19 丁勇 Apparatus for monitoring settlement of tunnel through distributed fiber, and method thereof
CN104316024A (en) * 2014-10-09 2015-01-28 中国人民解放军国防科学技术大学 Simple cascading camera chain measuring method and system for monitoring multipoint settlement
CN104316024B (en) * 2014-10-09 2017-01-18 中国人民解放军国防科学技术大学 Simple cascading camera chain measuring method and system for monitoring multipoint settlement
CN104501773A (en) * 2014-12-16 2015-04-08 河海大学 Device and method for monitoring vertical deformation of hydraulic construction
CN104501772A (en) * 2014-12-16 2015-04-08 河海大学 Device and method for monitoring differential settlement in portfolio for soil-stone combined region with hydraulic structure
CN104501772B (en) * 2014-12-16 2015-08-12 河海大学 Hydro-structure soil stone calmodulin binding domain CaM non-uniform settling combination monitoring device and method

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Granted publication date: 20140507

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