CN104989389A - Coal mass strength distribution characteristic continuous detecting method and device - Google Patents
Coal mass strength distribution characteristic continuous detecting method and device Download PDFInfo
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Abstract
The invention discloses a coal mass strength distribution characteristic continuous detecting method and device. The method includes the steps of connecting a short-circuit test element for detecting the torque, drilling pressure and drilling depth of a real-time detection drill bit between the drill bit and a drill stem, recording and storing the detected torque, drilling pressure and time signals of the drill bit through the short-circuit test element, converting the torque, drilling pressure and time signals into vibration signals or electromagnetic signals, transmitting the vibration signals or electromagnetic signals to a signal receiver, conducting analysis through a signal processor to obtain a depth-torque curve and a depth-drilling pressure curve, and conducting comprehensive comparing and analyzing on the real-time curves and information stored in the short-circuit test element to obtain coal mass strength distribution characteristics. By means of the method and device, the current situations that underground coal mine coal mass strength testing complexity is high, advanced detection is difficult, and test results can hardly meet prediction requirements are broken through, the coal mass strength distribution characteristic continuous detection in the drilling process is achieved through drilling information, and the method is easy and convenient to implement, scientific in test principle, accurate in result, intelligent, efficient, advanced and practical and has great application prospects in the technical field of mine dynamic disaster forecasting and early warning.
Description
Technical field
The present invention relates to mine motive force hazard prediction early warning technology field, particularly relate to a kind of method and device of coal mass strength distribution characteristics continuous probe.
Background technology
In recent years, along with adopting dark increasing, underground coal mine ground pressure constantly raises, and mine gas pressure and content also increase gradually, many mines upgrade to bump mine and coal and gas outburst mine, dynamic disaster takes place frequently.The impact of generation not only by geostatic stress of the dynamic disasters such as burst and outburst is remarkable, and closely related with the physical property of the intensity, soft or hard degree etc. self of coal body.The intensity property of coal body and variable effect thereof the possibility that the dynamic disasters such as outstanding and bump occur, it is one of important parameter of prediction mine motive force disaster, therefore, the prediction and prevention of intensity distribution feature to mine motive force disaster detecting tunnel different distance and diverse location place, work plane front coal body is significant.
The measuring technology of existing coal mass strength has a lot, mostly is the fixed test of underground coal mine zones of different position coal mass strength.Laboratory obtain the intensity level that records of coal sample and coal body actual strength value deviation larger; On-the-spot test technology has chip method, rebound hardness, cutting method, point carries the methods such as intensity, the uniaxial compressive strength that only can detect permanent position, tunnel place coal body that these methods have, the change of work plane front coal mass strength can not be recorded, some operations are too complicated, and result is difficult to meet the outstanding requirement waiting dynamic disaster prediction.And in the process of drilling, by the impact of stress distribution, coal mass strength value constantly changes, realize the real-time continuous detection of coal mass strength most important to the prediction and warning of mine motive force disaster when implementing advanced prediction boring.The existing techniques and methods carrying out coal mass strength test in underground coal mine drills process is still immature, wangkai, Yu Qixiang proposes to utilize drilling power to carry out the detection of coal mass strength, drilling power affects larger by various factors, it is not used widely in down-hole to the reflection of coal mass strength and inaccuracy; Zhu Liyuan, Li Zhonghua etc. propose a kind of drilling cuttings moment of torsion probe method, and what this method detected is the moment of torsion that rig is delivered to drilling rod, and it need further checking to the reflection of drill bit place coal mass strength.Comprehensive present status in China, it is not yet ripe to the real-time continuous test of coal mass strength in underground coal mine fights each other drill-through journey, application is had in underground coal mine difficulty, a kind of science, accurately method need carry out the continuous probe of coal mass strength distribution characteristics, thus better serve the prediction and prevention of underground coal mine dynamic disaster.
Summary of the invention
The object of the invention is for the deficiency in prior art, provide a kind of simple to operate, in real time accurately, the method for the coal mass strength distribution characteristics continuous probe of high efficiency smart and device.
To achieve these goals, coal mass strength distribution characteristics continuous probe method of the present invention, comprises the following steps:
A. start rig to while the construction drill of coal seam, the test shorting member be installed between drill bit and drilling rod is started working in drilling process;
B. drill bit constantly impacts feed the effect of power at rig under, peels off coal body, and send impact endurance test shock signal, impact endurance test shock signal is propagated to drilling rod exposed junction direction by drill bit, impact endurance test shock signal is through test shorting member, detected by test shorting member and done once record, being designated as time signal t
1, impact endurance test shock signal reflects after being transmitted to drilling rod end, returns along drilling rod to drill bit direction, more again detects and the record that tries again through test shorting member, is designated as time signal t
2;
C. after drill bit runs into the coal body of varying strength, can there is corresponding change in torque-on-bit and the pressure of the drill, can detect and store torque-on-bit and the pressure of the drill signal in real time by test shorting member, the time signal of telecommunication t of impact endurance test shock that test shorting member will detect simultaneously
1and t
2, torque signal and the pressure of the drill signal be converted to vibration signal or convert information to electromagnetic signal along drill pipe transmission to signal receiver;
D. signal receiver Received signal strength send information to signal processor by wire or wireless mode, signal processor is according to the time signal of telecommunication t received
1and t
2show that impact endurance test shock signal completes Once dissemination and reflection required time t=t along drilling rod
1-t
2then can according to run of steel l=vt/2, calculate drilling depth h=l+a-b, draw the corresponding informance of different drilling depth place " degree of depth-moment of torsion-the pressure of the drill ", and draw " degree of depth-moment of torsion " curve and " degree of depth-the pressure of the drill " curve in real time by display screen, drawn the variation characteristic of different depth coal mass strength by the mutation analysis of moment of torsion and the pressure of the drill, realize the pre-test of coal mass strength distribution characteristics in drilling process; In formula: v is spread speed, a is the length of the bit, and b is drilling rod revealed section length;
E. drill bit is exited after drilling construction, take off test shorting member, record in shorting member and the time stored, moment of torsion and the pressure of the drill information are analyzed again, " degree of depth-moment of torsion " curve of contrast real-time detection gained and " degree of depth-the pressure of the drill " curve, comprehensive analysis draws different depth place coal mass strength distribution characteristics, thus realizes the continuous probe of coal mass strength distribution characteristics.
The described boring to coal seam construction at least to be constructed 3 to coal body front at nearly level, gently inclined seam work plane and is holed.
A kind of coal mass strength distribution characteristics continuous detectiion equipment realizing said method, comprise drill bit, drilling rod, rig, water just, between described drill bit and drilling rod, be connected with one test shorting member, described drilling rod and water just between be connected with a signal receiver, signal receiver is connected with signal processor through wire; Described test shorting member diameter is identical with drilling rod, is connected threadably with drill bit and drilling rod, and test shorting member comprises the strain gauge transducer being built-in with and can measuring moment of torsion and the pressure of the drill and the micro-vibration sensor that can detect and record impact shock signal.
Beneficial effect: because the intensity level of torque-on-bit, the pressure of the drill and bit location place coal body is closely related, torque-on-bit and the pressure of the drill can reflect the size of bit location place coal mass strength comparatively accurately, the present invention utilizes the dependency relation of torque-on-bit, the pressure of the drill and its position place coal mass strength in process of drilling, the variation characteristic of different depth place coal mass strength is worth by real-time detection torque-on-bit, the pressure of the drill and drilling depth, achieve the continuous probe of coal mass strength distribution characteristics, for the prevention of mine motive force disaster provides reference.The present invention is directed to the present situation of mine motive force hazard prediction difficulty, breach original underground coal mine coal mass strength on-the-spot test component difficulty large, forward probe difficulty and test result are difficult to the present situation meeting prediction requirement, after theory analysis and laboratory experiment analytic demonstration, utilize torque-on-bit, the dependency relation of the pressure of the drill and bit location place coal mass strength, between drill bit with drilling rod, be connected one cleverly can real-time detection torque-on-bit, the short circuit original paper of the pressure of the drill and drilling depth, by in drilling process to torque-on-bit, the continuous probe of the pressure of the drill and drilling depth draws the continuous distributed feature of coal mass strength.Test philosophy science, result is accurate, and the creationary dynamic realtime detection achieving torque-on-bit, the pressure of the drill and drilling depth, takes full advantage of drill hole information, high efficiency smart, advanced practical; Detect coal mass strength when constructing common boring, can understand the distribution characteristics of coal rock strength around tunnel in real time, the FORECAST AND PREVENTION for bump provides authentic and valid coal mass strength information; When constructing advanced prediction boring or extinction boring, continuous probe being carried out to coal mass strength distribution characteristics, the situation of change of square coal mass strength in face of work can be gone out, for the prediction and prevention of the various dynamic disaster of underground coal mine provides important reference information by accurate detection.The present invention detects the real-time continuous of coal mass strength when can be widely used in coal mine underground construction boring, can be the daily production in colliery and provides important information, have good application prospect in mine motive force hazard prediction early warning technology field.
Accompanying drawing explanation
Fig. 1 (a) is that schematic diagram is arranged in coal mass strength distribution characteristics forward probe of the present invention boring;
Fig. 1 (b) is that the A-A of Fig. 1 (a) is to schematic diagram;
Fig. 2 is the schematic diagram of drilling depth real-time detection principle of the present invention;
Fig. 3 is coal mass strength distribution characteristics continuous detectiion equipment structural representation of the present invention.
In figure: 1-driving face, 2-holes, 3-coal body, 4-drill bit, 5-drilling rod, 6-tests shorting member, 7-rig, 8-water just, 9-signal receiver, 10-wire, 11-signal processor, 12-display screen, the 13-degree of depth-torque curve, the 14-degree of depth-load curve, 15-vibration or electromagnetic signal propagation direction, 16-impact endurance test shock signal propagation direction, 17-impact endurance test shock signal return direction.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
Coal mass strength distribution characteristics continuous detectiion equipment of the present invention, primarily of drill bit 4, drilling rod 5, rig 7, water just 8, test shorting member 6, signal receiver 9 and signal processor 11 form, described drill bit 4 be connected one between drilling rod 5 and test shorting member 6, just be connected a signal receiver 9 at described drilling rod 5 between 8 with water, signal receiver 9 is connected with signal processor 11 through wire 10; Described test shorting member 6 diameter is identical with drilling rod 5, be connected threadably with drill bit 4 and drilling rod 5, test shorting member 6 comprises the strain gauge transducer being built-in with and can measuring moment of torsion and the pressure of the drill and the micro-vibration sensor that can detect and record impact shock signal.
Coal mass strength distribution characteristics continuous probe method of the present invention, step is as follows:
A. start rig 7 to while coal seam 3 construction drill 2, the test shorting member 6 be installed between drill bit 4 and drilling rod 5 is started working in drilling process; Described boring 2 of constructing to coal seam 3 at least to be constructed 3 to coal body front at nearly level, gently inclined seam work plane and is holed;
B. drill bit 4 constantly impacts feed the effect of power at rig 7 under, peels off coal body 3, and send impact endurance test shock signal, impact endurance test shock signal is propagated to drilling rod exposed junction direction 16 by drill bit 4, impact endurance test shock signal is when test shorting member 6, detected by test shorting member 6 and done once record, being designated as time signal t
1, impact endurance test shock signal reflects after being transmitted to drilling rod 5 end, returns along drilling rod 5 to drill bit direction 17, more again detects and the record that tries again when test shorting member 6, is designated as time signal t
2;
C. after drill bit 4 runs into the coal body 3 of varying strength, corresponding change can be there is in drill bit 4 moment of torsion and the pressure of the drill, can detect and store torque-on-bit and the pressure of the drill signal in real time by test shorting member 6, the time signal of telecommunication t of impact endurance test shock that test shorting member 6 will detect simultaneously
1and t
2, torque signal and the pressure of the drill signal be converted to vibration signal or information converted to electromagnetic signal and transfer to signal receiver 9 along drilling rod 5;
D. signal receiver 9 Received signal strength send information to signal processor 11 by wire 10 or wireless mode, signal processor 9 is according to the time signal of telecommunication t received
1and t
2show that impact endurance test shock signal completes Once dissemination and reflection required time t=t along drilling rod 5
1-t
2then can according to run of steel l=vt/2, calculate drilling depth h=l+a-b, draw the corresponding informance of different drilling depth place " degree of depth-moment of torsion-the pressure of the drill ", and draw " degree of depth-moment of torsion " curve 13 and " degree of depth-the pressure of the drill " curve 14 in real time by display screen 12, drawn the variation characteristic of different depth coal mass strength by the mutation analysis of moment of torsion and the pressure of the drill, realize the pre-test of coal mass strength distribution characteristics in drilling process; In formula: v is spread speed, a is the length of the bit, and b is drilling rod revealed section length;
E. drill bit 4 is exited after boring 2 construction, take off test shorting member 6, record in shorting member 6 and the time stored, moment of torsion and the pressure of the drill information are analyzed again, " degree of depth-moment of torsion " curve 13 of contrast real-time detection gained and " degree of depth-the pressure of the drill " curve 14, comprehensive analysis draws different depth place coal mass strength distribution characteristics, thus realizes the continuous probe of coal mass strength distribution characteristics.
Embodiment 1, projecting coal bed for a nearly level of certain projecting mine, as shown in Fig. 1 (a), when carrying out driving face 1 outburst prediction, in Driving Face in Coal Tunnel 1 men working advanced prediction boring 2, be defined in nearly level by protrusion-dispelling, gently inclined seam work plane at least should be constructed 3 to coal body front and be holed, bore diameter is 42mm, hole depth H is 8 ~ 10m, carries out the test of drilling cuttings gasresolution index and coal powder quantity of bore; Boring 2 is arranged in the soft layering of coal body 3 as far as possible, boring such as a 1# hole in Fig. 1 (a) is positioned in the middle part of digging laneway section, and be parallel to tunneling direction, other 2 borings are as 2#, 3# hole in Fig. 1 (a), the whole hole point in 2#, 3# hole should be positioned at the outer 2 ~ 4m place of drift section both sides outline line, is designated as vertical height d.
Start rig 7, the boring 2 of the advanced prediction that starts to construct to coal seam 3, in the process of creeping into, tests coal powder quantity of bore and drilling cuttings gasresolution index respectively; Test shorting member 6 simultaneously between drill bit 4 and drilling rod 5 is started working in drilling process, by the detectable drilling depth of test shorting member 6, as shown in Figure 2, along with drill bit 4 ceaselessly creeps into, drill bit 4 constantly impacts, peels off coal body 3 under the effect of power is entered in rig 7 feeding, send impact endurance test shock signal, impact endurance test shock signal is propagated to drilling rod exposed junction direction 16 by drill bit 4, when test shorting member 6, test shorting member 6 can detect this impact endurance test shock signal and do once record, is designated as time signal t
1, impact endurance test shock signal reflects after being transmitted to drilling rod 5 end, returns along drilling rod 5 to drill bit direction 17, is again detected, is designated as time signal t in time testing shorting member 6
2, the time signal t of the test timing automatic record storage of shorting member 6 twice detection
1and t
2, after drill bit 4 runs into the coal body 3 of varying strength simultaneously can there is corresponding change in drill bit 4 moment of torsion and the pressure of the drill, and this shorting member 6 can detect and store torque-on-bit, the pressure of the drill signal in real time, the time signal of telecommunication t that test shorting member will detect simultaneously
1and t
2, torque signal and the pressure of the drill signal be converted to vibration signal or information converted to electromagnetic signal and transfer to signal receiver 9 along drilling rod 5, the direction of propagation 15 of vibration or electromagnetic signal, as shown in Figure 3; Signal receiver 9 Received signal strength, and by wire 10, information is sent to signal processor 11, signal processor 9 is according to the time signal of telecommunication t received
1and t
2show that impact endurance test shock signal completes Once dissemination and reflection required time t=t along drilling rod 5
1-t
2due to known spread speed v, then drilling rod 5 length l=vt/2, drill bit 4 length is a again, drilling rod 5 revealed section length is b, as shown in Figure 2, then can calculate drilling depth h=l+a-b, draw the corresponding informance of different drilling depth place " degree of depth-moment of torsion-the pressure of the drill ", and draw " degree of depth-moment of torsion " curve 13 and " degree of depth-the pressure of the drill " curve 14 on the display 12 in real time, drawn the variation characteristic of different depth coal mass strength by the mutation analysis of moment of torsion and the pressure of the drill, achieve the pre-test of coal mass strength distribution characteristics in drilling process; Drill bit 4 is exited after boring 2 construction, take out test shorting member 6, record in shorting member 6 and the time stored, moment of torsion and the pressure of the drill information are analyzed again, " degree of depth-moment of torsion " curve 13 of contrast real-time detection gained and " degree of depth-the pressure of the drill " curve 14, comprehensive analysis draws different depth place, driving face 1 front coal mass strength distribution characteristics, namely achieves the continuous probe of coal mass strength distribution characteristics.Coal mass strength, coal powder quantity of bore and drilling cuttings gasresolution three indexs can reflect the coal mass strength distribution of driving face 1 front, stress distribution and gas bearing capacity situation accurately, Comprehensive Comparison investigation is carried out to these three indexs, the scientific forecasting to this coal seam 3 Driving Face in Coal Tunnel 1 outburst hazard can be realized.
Claims (3)
1. a coal mass strength distribution characteristics continuous probe method, is characterized in that comprising the following steps:
A. start rig (7) to while coal seam (3) construction drill (2), the test shorting member (6) be installed between drill bit (4) and drilling rod (5) is started working in drilling process;
B. drill bit (4) constantly impacts, peels off coal body (3) under rig (7) feeds the effect of power, and send impact endurance test shock signal, impact endurance test shock signal is propagated to drilling rod exposed junction direction (16) by drill bit (4), impact endurance test shock signal is when test shorting member (6), detected by test shorting member (6) and done once record, being designated as time signal t
1, impact endurance test shock signal reflects after being transmitted to drilling rod (5) end, returns along drilling rod (5) to drill bit direction (17), more again detects and the record that tries again when test shorting member (6), is designated as time signal t
2;
C. after drill bit (4) runs into the coal body (3) of varying strength, corresponding change can be there is in drill bit (4) moment of torsion and the pressure of the drill, can detect and store torque-on-bit and the pressure of the drill signal in real time by test shorting member (6), the time signal of telecommunication t of impact endurance test shock that test shorting member (6) will detect simultaneously
1and t
2, torque signal and the pressure of the drill signal be converted to vibration signal or information converted to electromagnetic signal and transfer to signal receiver (9) along drilling rod (5);
D. signal receiver (9) Received signal strength also sends information to signal processor (11) by wire (10) or wireless mode, and signal processor (9) is according to the time signal of telecommunication t received
1and t
2show that impact endurance test shock signal completes Once dissemination and reflection required time t=t along drilling rod (5)
1-t
2then can according to run of steel l=vt/2, calculate drilling depth h=l+a-b, draw the corresponding informance of different drilling depth place " degree of depth-moment of torsion-the pressure of the drill ", and draw " degree of depth-moment of torsion " curve (13) and " degree of depth-the pressure of the drill " curve (14) in real time by display screen (12), drawn the variation characteristic of different depth coal mass strength by the mutation analysis of moment of torsion and the pressure of the drill, realize the pre-test of coal mass strength distribution characteristics in drilling process; In formula: v is spread speed, a is the length of the bit, and b is drilling rod revealed section length;
E. hole after (2) construct and exit drill bit (4), take off test shorting member (6), record in shorting member (6) and the time stored, moment of torsion and the pressure of the drill information are analyzed again, " degree of depth-moment of torsion " curve (13) of contrast real-time detection gained and " degree of depth-the pressure of the drill " curve (14), comprehensive analysis draws different depth place coal mass strength distribution characteristics, thus realizes the continuous probe of coal mass strength distribution characteristics.
2. coal mass strength distribution characteristics continuous probe method according to claim 2, is characterized in that: described boring (2) of constructing to coal seam (3) at least to be constructed 3 to coal body front at nearly level, gently inclined seam work plane and holed.
3. one kind realizes the coal mass strength distribution characteristics continuous detectiion equipment of method described in claim 1, comprise drill bit (4), drilling rod (5), rig (7), water just (8), it is characterized in that: between described drill bit (4) and drilling rod (5), be connected with one test shorting member (6), just be connected with a signal receiver (9) between (8) at described drilling rod (5) and water, signal receiver (9) is connected with signal processor (11) through wire (10); Described test shorting member (6) diameter is identical with drilling rod (5), be connected threadably with drill bit (4) and drilling rod (5), test shorting member (6) comprises the strain gauge transducer being built-in with and can measuring moment of torsion and the pressure of the drill and the micro-vibration sensor that can detect and record impact shock signal.
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| CN110778363A (en) * | 2019-11-06 | 2020-02-11 | 山东科技大学 | Method for determining coal body stress peak area and early warning through multi-parameter measurement while drilling |
| CN110778363B (en) * | 2019-11-06 | 2023-05-05 | 山东科技大学 | Multi-parameter measurement while drilling method for determining peak area of coal body stress and early warning |
| CN114991752A (en) * | 2022-06-29 | 2022-09-02 | 中国矿业大学 | Intelligent detection method for multilayer mining sleeve for ground drilling mining |
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