CN103362552B - Distributed fiber bragg grating anchor rod group stress monitoring system for coal mine tunnel - Google Patents
Distributed fiber bragg grating anchor rod group stress monitoring system for coal mine tunnel Download PDFInfo
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Abstract
A distributed fiber bragg grating anchor rod group stress monitoring system for a coal mine tunnel belongs to a coal mine tunnel anchor rod group stress monitoring system. The mining roadway anchor rod supporting stress monitoring subsystem, the tunneling roadway anchor rod supporting stress monitoring subsystem and the working face cut-hole anchor rod supporting stress monitoring subsystem respectively comprise at least one monitoring substation, communication optical fibers of the three subsystems are connected with a mining transmission optical cable through an optical fiber junction box, the mining transmission optical cable is connected with an input port of an optical fiber grating static demodulator, an output port of the optical fiber grating static demodulator is connected with a computer data processing system, and processed monitoring data are shared with a ground computer through a server and a coal mine local area network to form a coal mine roadway anchor rod group stress online real-time monitoring system. The anchor rod group stress monitoring network which takes the anchor rod as a sensing medium and takes the optical fiber as a transmission carrier adopts a series structure, the stress of the anchor rod group is measured in a distributed mode, the installation is convenient, the labor and the time are saved, and the monitoring cost is reduced.
Description
Technical field
The present invention relates to a kind of coal mine roadway Bolt Groups stress monitoring system, especially a kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system.
Background technology:
In recent years, along with improving constantly of mining technique, China's coal-mine industry obtains better developing faster.As the basis of China's other industrial trades development, the raising of safety in production to social progress and national economy in colliery plays very important effect.But, along with the continuous increase of coal mining depth, the strata behaviors in colliery is more obvious, the disaster caused is also more and more serious, as the accidents such as roof collapse, roadway deformation, impulsion pressure frequently occur, become the key factor affecting Safety of Coal Mine Production, the production safety in colliery and the life security of practitioner in serious threat.In order to ensure the stable of the rear country rock of coal mine roadway excavation, prevent country rock large area caving or produce excessive deformation and affect Safety of Coal Mine Production, carry out after generally taking tunnelling supporting measure immediately in existing colliery; In recent years, anchor pole is as the main tool of roadway support, more and more extensive in the application of mining engineering field, is also given sufficient attention monitoring stressed in bolt support process.
Bolt support belongs to disguised engineering, and the bad roof caving, two that just may cause of supporting effect helps the generation of the roadway surrounding rock disaster such as slabbing, working face open-off cut eye.Therefore, bolt support construction after, must to rockbolt stress distribution and size is carried out comprehensively, the monitoring of system, judge degree of stability and the safety of roadway surrounding rock.At present, rockbolt stress monitoring is all carried out single anchor rod, monitoring means mostly is resistance-strain chip force-measuring anchor stock, fluid pressure type rock bolt extensometer, although size and the distribution of rockbolt stress can be measured, the coupled relation between adjacent Bolt Groups and country rock can not be reflected, moreover adopt artificial continued observations and collection, monitoring result is delayed and data error that is that obtain is larger, survey station breakpoint formula distributes, discontinuous, is subject to electromagnetic interference; Further, present coal mine roadway length is longer, carries out load-bearing monitor to single anchor rod, and workload is comparatively large, and inconvenient operation, when both taking a lot of work, uneconomical again, to realizing, the comprehensive on-line real time monitoring in coal mine tunnel is quite difficult.
Summary of the invention
The object of the invention is to provide that a kind of certainty of measurement is high, antijamming capability strong, can the continuous measurement Bolt Groups body of rod stressed, monitored data error is little, can the coal mine roadway distributed fiber grating Bolt Groups stress monitoring system of real time on-line monitoring.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system, comprises roadway supported with bolts stress monitoring subsystem, digging laneway bolt support stress monitoring subsystem and working face open-off cut eye bolt support stress monitoring subsystem, above-mentioned three bolt support stress monitoring subsystems include several Monitor Sub-Station of Less, each Monitor Sub-Station of Less is all monitored roofbolt and two and is helped rockbolt stress, roofbolt and two in the Monitor Sub-Station of Less of each bolt support stress monitoring subsystem helps anchor pole to be cascaded by communication optical fiber, the exit communication optical fiber of three bolt support stress monitoring subsystems is connected with mining transmission cable by optical Fiber Closure, mining transmission cable is connected with the input port of the static (FBG) demodulator of fiber grating, the wavelength signals of input is demodulated into the signal of telecommunication by the static (FBG) demodulator of fiber grating, the output port of the static (FBG) demodulator of fiber grating is connected with computer data processing system, monitored data after process and ground-based computer are shared by server and colliery LAN by computer data processing system, form coal mine roadway Bolt Groups distribution of force formula, comprehensive on-line real time monitoring system.
Described Monitor Sub-Station of Less, according to the geological conditions in colliery and Mining technology condition quantification, arranges the quantity of anchor pole more in the place that geological conditions is poor.
Described roofbolt and two helps anchor pole to be fiber grating force-measuring anchor stock, the length of anchor pole is 180mm-240mm, one is carved deeply for 1.5mm, width are the groove of about 2mm in the bilateral symmetry of anchor rod body, by epoxy glue, fiber grating is fixed in groove, and draws connection line of optic fibre at the afterbody of anchor pole.
The method of attachment that described roofbolt and two helps anchor pole to be cascaded is that connection line of optic fibre is by optical fiber splicer welding or connected as one by fiber coupler.
The output port of the static (FBG) demodulator of described fiber grating passes through network interface or RS232 interface or USB interface and is connected with computer data processing system.
Described computer data processing system specifically comprises following subsystem:
(1) input subsystem, manually keys in the alarm threshold value arranging bolt design parameters and rockbolt stress according to mine situation;
(2) ADMINISTRATION SUBSYSTEM, to monitored data autostore, and can historical query and data information sharing;
(3) analyzing subsystem, carries out trend analysis to monitored data, parameter association analysis and comparative analysis;
(4) output subsystem, online Dynamic Announce monitoring parameter data, generate group financial statements and stress curve figure, export the dangerous integrated forecasting of tool and overload alarm situation, and have printing function.
Beneficial effect, owing to have employed such scheme, utilizes optical fiber by the side anchor pole in tunnel and roofbolt series connection, forms the grating anchor rod group stress monitoring network that sensing technology is in a distributed manner means.Utilize the fiber grating be pasted onto on anchor rod body as sensing element, realize the measurement of rockbolt stress.During surrouding rock deformation when between anchor pole location, because adhesion stress or frictional force make bolt deformation, the surrouding rock deformation of anchor pole constraint simultaneously, just makes anchor pole produce axial force, and the nut tension of anchor pole end produces again additional axial force in addition.Rockbolt stress will produce surperficial micro-strain, the pitch of the fiber grating be attached on anchor pole will be deformed with it, the reflection kernel wavelength of fiber grating will be caused to produce drift, the fiber bragg grating center wavelength value of each force-measuring anchor stock is all not identical, utilize the static (FBG) demodulator of fiber grating that different wavelength signals is demodulated into the signal of telecommunication, by computer data processing system, post-processed is carried out to the signal of telecommunication, interface Dynamic Announce Real-time Monitoring Data and rockbolt stress curve map, and carry out rockbolt stress trend analysis and overload alarm, realize coal mine roadway Bolt Groups stress real-time monitoring system, comprehensive understanding rockbolt stress situation, for the stability and safety that improve roadway surrounding rock provide foundation, ensure safety of coal mines High-efficient Production.
The present invention proposes coal mine roadway distributed fiber grating Bolt Groups stress monitoring system first, Bolt Groups stress monitoring network adopts the structure of series connection, fusion techniques or fiber coupler is utilized the fusion of the connection line of optic fibre of fiber grating force-measuring anchor stock to be integrated, decrease loss when fiber-optic signal is propagated, improve the degree of accuracy of rockbolt stress monitoring.The fiber grating that the present invention simultaneously utilizes is as sensing element, for on-the-spot non-active operation, essential safety, instead of traditional live line work sensor, improve the safety factor of coal mine working, system adopts all-fiber to carry out optical signal transmission, using optical signal as information carrier, reliability is high, and by the impact of colliery Zhong Shui, gas and other electromagnetic radiation, antijamming capability is strong.Long transmission distance, adapts to the long distance monitoring of coal mine roadway.System, to the comprehensive active monitoring of coal mine roadway Bolt Groups, decreases workload degree when monitoring single anchor rod, time saving and energy saving, easy for installation, reduces monitoring expense simultaneously, has far-reaching influence to realizing the comprehensive on-line real time monitoring in coal mine tunnel.
Accompanying drawing explanation
Fig. 1 is integral arrangement structure chart of the present invention.
Fig. 2 is computer data processing system functional block diagram of the present invention.
Fig. 3 is fiber grating force-measuring anchor stock structure chart of the present invention.
Fig. 4 is Bolt Groups connection layout in tunnel monitor substation of the present invention.
In figure, 1, anchor pole; 2, groove; 3, epoxy glue; 4, fiber grating; 5, connection line of optic fibre; 6, tunnel; 11, a side anchor pole; 12, No. two roofbolts; 13, No. three roofbolts; 14, No. four roofbolts; 15, No. five side anchor poles.
Detailed description of the invention
Below in conjunction with accompanying drawing, invention is further described:
Embodiment 1: in FIG, a kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system, comprises roadway supported with bolts stress monitoring subsystem, digging laneway bolt support stress monitoring subsystem and working face open-off cut eye bolt support stress monitoring subsystem, above-mentioned three bolt support stress monitoring subsystems include several Monitor Sub-Station of Less, each Monitor Sub-Station of Less is all monitored roofbolt and two and is helped rockbolt stress, roofbolt and two in the Monitor Sub-Station of Less of each bolt support stress monitoring subsystem helps anchor pole to be cascaded by communication optical fiber, the exit communication optical fiber of three bolt support stress monitoring subsystems is connected with mining transmission cable by optical Fiber Closure, mining transmission cable is connected with the input port of the static (FBG) demodulator of fiber grating, the wavelength signals of input is demodulated into the signal of telecommunication by the static (FBG) demodulator of fiber grating, the output port of the static (FBG) demodulator of fiber grating is connected with computer data processing system, monitored data after process and ground-based computer are shared by server and colliery LAN by computer data processing system, form coal mine roadway Bolt Groups distribution of force formula, comprehensive on-line real time monitoring system.Described ground-based computer is the ground-based computer of colliery leader and desk work personnel manipulation.
Computer data processing system of the present invention as shown in Figure 2 specifically comprises following subsystem:
(1) input subsystem, manually keys in the alarm threshold value arranging bolt design parameters and rockbolt stress according to mine situation;
(2) ADMINISTRATION SUBSYSTEM, to monitored data autostore, and can historical query and data information sharing;
(3) analyzing subsystem, carries out trend analysis to monitored data, parameter association analysis and comparative analysis;
(4) output subsystem, online Dynamic Announce monitoring parameter data, generate group financial statements and stress curve figure, export the dangerous integrated forecasting of tool and overload alarm situation, and have printing function.
Fig. 3 is fiber grating force-measuring anchor stock, its structure is the length of anchor pole 1 is 180mm-240mm, carving one in the bilateral symmetry of anchor pole 1 body of rod is deeply the groove 2 that 1.5mm, width are about 2mm, is fixed in groove, and draws connection line of optic fibre 5 at the afterbody of anchor pole 1 by epoxy glue 3 by fiber grating 4.Fiber grating force-measuring anchor stock in use, the boring adapted with bolt diameter size is pierced in roadway surrounding rock, fiber grating force-measuring anchor stock is inserted in boring, and connection line of optic fibre is drawn boring outside, then pallet is put at the exposed junction of anchor pole successively, packing ring, nut screwing clamping, makes anchor pole be fixed in wall rock drill-hole.
Fig. 4 is Bolt Groups method of attachment in tunnel monitor substation, in a Monitor Sub-Station of Less in tunnel 6,5 fiber grating force-measuring anchor stocks are installed, are respectively side anchor pole 11, No. two roofbolts 12, No. three roofbolts 13, No. four roofbolts 14, No. five side anchor poles 15.Method of attachment is that a wherein connection line of optic fibre 5 of a side anchor pole 11 is fused by optical fiber splicer or by a wherein connection line of optic fibre of fiber coupler and No. two roofbolts 12, an other connection line of optic fibre of No. two roofbolts 12 and a wherein connection line of optic fibre of No. three roofbolts 13 are fused, be linked in sequence to a connection line of optic fibre of No. five side anchor poles 15 successively, an other connection line of optic fibre 5 of No. five side anchor poles 15 is connected with the connection line of optic fibre of the fiber grating force-measuring anchor stock in the next Monitor Sub-Station of Less in tunnel, Bolt Groups stress monitoring network in the tunnel of formation cascaded structure.
Claims (1)
1. a coal mine roadway distributed fiber grating Bolt Groups stress monitoring system, it is characterized in that: a kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system, comprise roadway supported with bolts stress monitoring subsystem, digging laneway bolt support stress monitoring subsystem and working face open-off cut eye bolt support stress monitoring subsystem, above-mentioned three bolt support stress monitoring subsystems include several Monitor Sub-Station of Less, each Monitor Sub-Station of Less is all monitored roofbolt and two and is helped rockbolt stress, roofbolt and two in the Monitor Sub-Station of Less of each bolt support stress monitoring subsystem helps anchor pole to be cascaded by communication optical fiber, the exit communication optical fiber of three bolt support stress monitoring subsystems is connected with mining transmission cable by optical Fiber Closure, mining transmission cable is connected with the input port of the static (FBG) demodulator of fiber grating, the wavelength signals of input is demodulated into the signal of telecommunication by the static (FBG) demodulator of fiber grating, the output port of the static (FBG) demodulator of fiber grating is connected with computer data processing system, monitored data after process and ground-based computer are shared by server and colliery LAN by computer data processing system, form coal mine roadway Bolt Groups distribution of force formula, comprehensive on-line real time monitoring system,
The method of attachment that described roofbolt and two helps anchor pole to be cascaded is that connection line of optic fibre is by optical fiber splicer welding or connected as one by fiber coupler.
2. a kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system according to claim 1, it is characterized in that: described roofbolt and two helps anchor pole to be fiber grating force-measuring anchor stock, the length of anchor pole is 180mm-240mm, one is carved deeply for 1.5mm, width are the groove of about 2mm in the bilateral symmetry of anchor rod body, by epoxy glue, fiber grating is fixed in groove, and draws connection line of optic fibre at the afterbody of anchor pole.
3. a kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system according to claim 1, is characterized in that: the output port of the static (FBG) demodulator of described fiber grating passes through network interface or RS232 interface or USB interface and is connected with computer data processing system.
4. a kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system according to claim 1, is characterized in that: described computer data processing system specifically comprises following subsystem:
(1) input subsystem, manually keys in the alarm threshold value arranging bolt design parameters and rockbolt stress according to mine situation;
(2) ADMINISTRATION SUBSYSTEM, to monitored data autostore, and can historical query and data information sharing;
(3) analyzing subsystem, carries out trend analysis to monitored data, parameter association analysis and comparative analysis;
(4) output subsystem, online Dynamic Announce monitoring parameter data, generate group financial statements and stress curve figure, export the dangerous integrated forecasting of tool and overload alarm situation, and have printing function.
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