CA2997155C - Sound level meter-based tunnel roof rock protodyakonov coefficient detecting-while-drilling apparatus and method - Google Patents

Sound level meter-based tunnel roof rock protodyakonov coefficient detecting-while-drilling apparatus and method Download PDF

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Publication number
CA2997155C
CA2997155C CA2997155A CA2997155A CA2997155C CA 2997155 C CA2997155 C CA 2997155C CA 2997155 A CA2997155 A CA 2997155A CA 2997155 A CA2997155 A CA 2997155A CA 2997155 C CA2997155 C CA 2997155C
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drilling
rock
level meter
sound level
roof
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CA2997155A1 (en
Inventor
Xigui ZHENG
Tieliang An
Xing Cheng
Shiao Li
Hui Su
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China University of Mining and Technology
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China University of Mining and Technology
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Application filed by China University of Mining and Technology filed Critical China University of Mining and Technology
Priority to PCT/CN2017/091610 priority patent/WO2018103325A1/en
Publication of CA2997155A1 publication Critical patent/CA2997155A1/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/12Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/12Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • E21B47/14Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/003Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by analysing drilling variables or conditions

Abstract

The present invention discloses sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus and a method. Aiming at the detecting-while-drilling problem of the important rock mechanics index--Protodyakonov coefficient affecting the anchoring and supporting scheme of the coal mine tunnel roof, drill holes of .PHI.32-42mm are constructed in the tunnel roof, bearing type while-drilling apparatus with a sound level meter probe is arranged behind a drilling bit. A method of combining with the reading of a scale drill stem is used. In the drilling process, the volume decibel of drill holes with different depths is tested, the Protodyakonov coefficient of the rock within the range of the tunnel roof drill holes is obtained quickly by comparing with the volume decibel of the in-situ rock drilling in the tunnel in conjunction with the standard library of the rock Protodyakonov coefficient of 0.3 to 20 established in the laboratory, and harmful noise in the punching process is converted into useful sound source, thereby achieving the detecting-while-drilling technology. It is suitable for the detecting while drilling of the Protodyakonov coefficient of sandstone, shale, mudstone and other typical deposited rock strata of coal measure strata. It has the advantages of convenient use on site, simple operation, low labor intensity and no influence on normal production.

Description

Description Sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus and method I. Field of the Invention =
The present invention relates to a detecting-while-drilling apparatus and a method, which belong to the technical field of mine tunnel support, and particularly relates to sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus and method which are suitable for the geological conditions under which the space between bedding planes between rock strata with different lithological characters at the tunnel roof of the coal mine is small.
II. Background of the Invention Tunnel support is a key technology for the safety mining of coal. There is a considerable proportion of roof accidents in mine disasters, resulting from insufficient support strength caused by failure to timely ascertaining the lithological characters of local roof. Hence, during the tunnel construction, it is necessary to timely ascertain the lithological characters of the tunnel roof. For the area where potential accident of roof fall exists, the support way should be timely changed or the support parameter is adjusted to ensure the safety and stability of the roof.
At present, the method for detecting the lithological characters of the local roof of the tunnel mainly includes the core taking method, the drill hole wall impression method, the drill hole wall observation method and geological radar detection and so on. For the core taking method, coring is carried out on the roof with the geological core drill, the lithologic characters of the roof are analyzed according to the columnar structure of the core, however, the geological drilling rig is not applicable to operation on the advancing working face and cannot be used at any time anywhere with the advancing of the development machine owing to its large volume. For the drill hole wall impression method, some plastic materials with no liquidity and elasticity are bound to the drill hole surfaces, the inner counters of the drill holes to be detected are copied into impression, and the impression is measured to evaluate the inner structures of the drill holes to be detected, however, such method neither measures the lithologic characters of the roof nor provides scientific and effective data for the design of the support way. For the drill hole wall observation method, scenes inside the drill holes are directly shot via the probe by using the rock stratum detection recorder and other devices, however, under the influence of the environment of underground coal mine, the obtained error of parameters of the roof surrounding rock structure is larger owing to low peeping accuracy. The geological radar detection is the electromagnetic technology in which different media in the roof rock strata are discriminated accurately and positioned in interfaces based on the difference in the electrical properties of detected media, such method is insufficient in disclosure degree to joint and fracture development and cannot effectively identify the lithologic characters of rock strata at the tunnel roof, but it is the key and difficult points in the design and construction of the tunnel support. Hence, aiming at the combined characteristics of rock strata at the roof of the coal mine, there is an urgent need to develop a method for adapting to the environment of underground coal mine and quickly identifying the lithological characters of the roof.
III. Content of the Invention Technical problem: aiming at the above-mentioned technical problems, the sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus which is simple in structure, easy to use and operate and low detection intensity and acquires the rock Protodyakonov coefficient of the tunnel roof via noise generated in the drilling process and the method thereof are provided.
Technical solution: in order to fulfill the above-mentioned purpose, the sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus of the present invention comprises bearing type while-drilling apparatus, an individual roof bolter, a sound level meter and a drill stem, wherein the individual roof bolter is vertically arranged on the tunnel bottom plate; the top of the individual roof bolter is provided with the bearing type while-drilling apparatus drilling into the tunnel roof via the scale drill stem; and the bearing type while-drilling apparatus is connected with the sound level meter via the connecting wire.
The bearing type while-drilling apparatus comprises sound level meter probes, conical members, a silence bearing and a drilling bit which are arranged on the drill stem, wherein the drilling bit is arranged on the top of the scale drill stem; the silence bearing is arranged on the drill stem below the drilling bit; a plurality of conical members are arranged on the silence bearing; the sound level meter probes are arranged on the conical members; and the sound level meter probes are connected with the sound level meter via the connecting wire.
The inner diameter of the silence bearing is 15 to 25mm, and the outer diameter is 25 to 35mm; and the inner diameter is in welded connection with the scale drill stem, and the outer diameter is in welded connection with the conical members.
The individual roof bolter is a hydraulic type or a pneumatic type; the drill stem is the scale drill stem, and the length of the scale drill stem is lm; a groove with the height of lcm and depth of lmm is machined from top to bottom at intervals of 10cm; a reflective coating is arranged on the surface of the scale drill stem; and stripes with red, orange, yellow, green, cyan, blue, purple, black and white are sprayed inside the groove from top to bottom along the drilling direction, wherein the length of Li is 100cm, and the length of 1,2 is 10cm.
A sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling method is characterized by comprising the following steps of:
a. Establishing the standard library of the Protodyakonov coefficient of 0.3 to 20 of the rock in mine: selecting the coring site in the tunnel of the same coal bed, drilling rocks at different layers within the range of 20m at the roof coring site, machining and combining to a standard test sample according to Measurement Method of Physical and Mechanical Properties of Coal and Rock, carrying out the drilling experiment in the laboratory by using the roof bolter and the drilling bit with respect to different combinations of rocks with cores Protodyakonov coefficients of 0.3 to 20, recording the decibel of noise in the process of drilling the standard test sample with the test drilling bit by using the sound level meter, and carrying out the drilling test on all standard test samples to obtain the range of noise decibel of the standard test sample of the rock with different Protodyakonov coefficients of 0.3 to 20 in the drilling process;
b. Starting the individual roof bolter, making the individual roof bolter drive the bearing type while-drilling apparatus via the drill stem to drill into the drill holes in the tunnel roof, the sound level meter starting to run, acquiring the noise decibel of the bearing type while-drilling apparatus in the drilling of the tunnel roof and the dynamic curve of decibel; stopping drilling by drilling every 10cm in conjunction with the reading of the scale drill stem, artificially reading the decibel range in the sound level meter, and comparing with the standard library of rock Protodyakonov coefficient of 0.3 to 20 established based on the mine to obtain the firmness coefficient of rock and drilling distance within the range; in case of sufficient length of the scale drill stem, additionally arranging the extended scale drill stem at the tail end;
c. repeating the step b to obtain the firmness coefficient of the rock within the range of the roof drill hole.
2 Beneficial effects: according to the method, noise generated in the punching process of the roof bolter is converted into beneficial sound source, achieving the real-time and continuous detection of the firmness coefficient of roof rock. The bearing type while-drilling apparatus with the sound level meter probe is arranged behind the drilling bit; the decibel of drill holes volume with different depths is tested in the drilling process in conjunction with the reading of the scale drill stem, and the rock Protodyakonov coefficient within the drilling range of tunnel roof is quickly obtained by comparing with the volume decibel of the drilling rock of the tunnel in situ in conjunction with the standard library of rock Protodyakonov coefficient of 0.3 to 20 established by the laboratory. Harmful noise in the punching process is converted into the beneficial sound source to timely adjust the support parameter according to local conditions with change in the firmness coefficient of the local roof rock in the detecting-while-drilling process, and support is enhanced or the support effect is reduced properly to effectively avoid support waste and roof fall caused by insufficient support strength during production, thereby providing safe and reliable operating environment for coal miners. The method has the advantages of convenience for site use, easiness in operation, low labor intensity and no influence on normal production.
IV. Brief Description of Accompanying Drawings Fig.1 is a schematic structural diagram of the plane layout of the invention;
Fig.2 is a schematic diagram of the bearing type while-drilling apparatus of the invention;
Fig.3 is a schematic diagram of the scale drill stem of the invention;
In the Figures, 1-Bearing type while-drilling apparatus; 2-Individual roof bolter; 3-Sound level meter, 4-Scale drill stem; 5-Tunnel roof; 6-Tunnel bottom plate; 7-Sound level meter probe; 8-Conical member; 9-Silence bearing; 10-Drilling bit; 11-Drill hole; 12-Connecting wire.
V. Detailed Description of the Embodiments Hereunder the present invention will be further detailed in an embodiment with reference to the accompanying drawings.
As shown in the Fig.1, the sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus of the invention comprises bearing type while-drilling apparatus 1, an individual roof bolter 2, a sound level meter 3 and a drill stem, wherein the individual roof bolter 2 is vertically arranged on the tunnel bottom plate 6; the top of the individual roof bolter 2 is provided with the bearing type while-drilling apparatus I drilling into the tunnel roof 5 via the scale drill stem 4; and the bearing type while-drilling apparatus 1 is connected with the sound level meter 3 via the connecting wire 12.
As shown in the Fig.2, the bearing type while-drilling apparatus 1 comprises sound level meter probes 7, conical members 8, a silence bearing 9 and drilling bit 10 which are arranged on the drill stem, wherein the drilling bit 10 is arranged on the top of the scale drill stem 4;
the silence bearing 9 is arranged on the drill stem below the drilling bit 10; a plurality of conical members 8 are arranged on the silence bearing 9; the sound level meter probes 7 are arranged on the conical members 8; and the sound level meter probes 7 are connected with the sound level meter 3 via the connecting wire 12.
The inner diameter of the silence bearing 9 is 15 to 25mm, and the outer diameter is 25 to 35mm; and the inner diameter is in welded connection with the scale drill stem 4, and the outer diameter is in welded connection with the conical members 8.
As shown in the Fig. 3, the individual roof bolter 2 is a hydraulic type or a pneumatic type; the drill stem is the scale drill stem 4, and the length of the scale drill stem 4 is lm; a groove with the height of lcm and depth of 1mm is machined from top to bottom at intervals of 10cm;
reflective coating is arranged on the surface of the scale drill stem 4; and stripes with red, orange, yellow, green, cyan, blue, purple, black and white are sprayed inside the groove from top to bottom along the drilling
3 direction, wherein the length of Li is 100cm, and the length of L2 is 10cm.
A sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling method is characterized by comprising the following steps of:
a. Establishing the standard library of the Protodyakonov coefficient of 0.3 to 20 of the rock in mine: selecting the coring site in the tunnel of the same coal bed, drilling rocks at different layers within the range of 20m at the roof coring site, machining and combining to a standard test sample according to Measurement Method of Physical and Mechanical Properties of Coal and Rock, carrying out the drilling experiment in the laboratory by using the roof bolter and the drilling bit with respect to different combinations of rocks with cores Protodyakonov coefficient of 0.3 to 20, recording the decibel of noise in the process of drilling the standard test sample with the test drilling bit by using the sound level meter, and carrying out the drilling test on all standard test samples to obtain the range of noise decibel of the standard test sample of the rock with different Protodyakonov coefficients of 0.3 to 20 in the drilling process;
b. Starting the individual roof bolter 2, making the individual roof bolter 2 drive the bearing type while-drilling apparatus 1 via the drill stem to drill into the drill holes 11 in the tunnel roof 5, the sound level meter 3 starting to run, acquiring the noise decibel of the bearing type while-drilling apparatus 1 in the drilling of the tunnel roof 5 and the dynamic curve of decibel; stopping drilling by drilling every 10cm in conjunction with the reading of the scale drill stem
4, artificially reading the decibel range in the sound level meter 3, and comparing with the standard library of rock Protodyakonov coefficient of 0.3 to 20 established based on the mine to obtain the firmness coefficient of rock and drilling distance within the range; comparing with the standard library of rock Protodyakonov coefficient of 0.3 to 20 according to the measured decibel at drilling by 0.1m to determine the firmness coefficient of rock within the distance of 0.1m in the drill hole;
according to different firmness coefficients of roof rock, modifying the support parameter timely, for example, when the rock within local roof is soft (such as mudstone), the support needs to be enhanced, and increase the density of bolt support to ensure roof stability;
when the rock within local roof is hard (such as sandstone), the array pitch between the bolt supports can be appropriately increased, the support requirement can be met, and meanwhile, material waste is reduced, thereby achieving the tunnel support according to local conditions;
in case of insufficient length of the scale drill stem 4, additionally arranging the extended scale drill stem 4 at the tail end;
c. Repeating the step b to obtain the firmness coefficient of the rock within the range of the roof drill hole 11.

Claims (5)

Claims
1. A sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus, wherein, comprising bearing type while-drilling apparatus (1), an individual roof bolter (2), a sound level meter (3) and a drill stem, wherein the individual roof bolter (2) is vertically arranged on a tunnel bottom plate (6); the top of the individual roof bolter (2) is provided with bearing type while-drilling apparatus (1) drilling into a tunnel roof (5) via a scale drill stem (4); and the bearing type while-drilling apparatus (1) is connected with the sound level meter (3) via a connecting wire (12).
2. The sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus according to claim 1, wherein, the bearing type while-drilling apparatus (1) comprises sound level meter probes (7), conical members (8), a silence bearing (9) and drilling bit (10) which are arranged on the drill stem, wherein the drilling bit (10) is arranged on the top of the scale drill stem (4); the silence bearing (9) is arranged on the drill stem below the drilling bit (10); a plurality of conical members (8) are arranged on the silence bearing (9); the sound level meter probes (7) are arranged on the conical members (8); and the sound level meter probes (7) are connected with the sound level meter (3) via the connecting wire (12) .
3. The sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus according to claim 2, wherein, the inner diameter of the silence bearing (9) is 15 to 25mm, and the outer diameter is 25 to 35mm; and the inner diameter is in welded connection with the scale drill stem (4), and the outer diameter is in welded connection with the conical members (8).
4. The sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus according to the claim 1 or 2, wherein, is characterized in that the individual roof bolter (2) is a hydraulic type or a pneumatic type; the drill stem is the scale drill stem (4), and the length of the scale drill stem (4) is lm; a groove with the height of 1cm and depth of 1mm is machined from top to bottom at intervals of 10cm ; reflective coating is arranged on the surface of the scale drill stem (4); and stripes with red, orange, yellow, green, cyancran, blue, purple, black and white are sprayed inside the groove from top to bottom along the drilling direction, wherein the length of Ll is 100cm, and the length of L2 is 10cm.
5. A sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling method using the apparatus of claim 1 is characterized by comprising the following steps of:
a. Establishing the standard library of the Protodyakonov coefficient of 0.3 to 20 of the rock in mine: selecting the coring site in the tunnel of the same coal bed, drilling rocks at different layers within the range of 20m at the roof coring site, machining and combining to a standard test sample according to Measurement Method of Physical and Mechanical Properties of Coal and Rock, carrying out the drilling experiment in the laboratory by using the roof bolter and the drilling bit with respect to different combinations of rocks with core Protodyakonov coefficient of 0.3 to 20, recording the decibel of noise in the process of drilling the standard test sample with the test drilling bit by using the sound level meter, and carrying out the drilling test on all standard test samples to obtain the range of noise decibel of the standard test sample of the rock with different Protodyakonov coefficients of 0.3 to 20 in the drilling process;
b. Starting the individual roof bolter (2), making the individual roof bolter (2) drive the bearing type while-drilling apparatus (1) via the drill stem to drill into the drill holes (11) in the tunnel roof (5), the sound level meter (3) starting to run, acquiring the noise decibel of the bearing type while-drilling apparatus (1) in the drilling of the tunnel roof (5) and the dynamic curve of decibel;
stopping drilling by drilling every 10 cm in conjunction with the reading of the scale drill stem (4), artificially reading the decibel range in the sound level meter (3), and comparing with the standard library of rock Protodyakonov coefficient of 0.3 to 20 established based on the mine to obtain the firmness coefficient of rock and drilling distance within the range; in case of insufficient length of the scale drill stem (4), additionally arranging the extended scale drill stem (4) at the tail end; and c. Repeating the step b to obtain the firmness coefficient of the rock within the range of the roof drill hole (11).
CA2997155A 2016-12-05 2017-07-04 Sound level meter-based tunnel roof rock protodyakonov coefficient detecting-while-drilling apparatus and method Active CA2997155C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201611101992.2A CN106593424B (en) 2016-12-05 2016-12-05 Back rock Protodyakonov coefficient based on sound level meter is with brill detection method
CN201611101992.2 2016-12-05
PCT/CN2017/091610 WO2018103325A1 (en) 2016-12-05 2017-07-04 Sound level meter-based measurement while drilling device and method for obtaining protodikonov's hardness coefficient of rock of tunnel roof

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CA2997155C true CA2997155C (en) 2019-06-18

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CN107387060A (en) * 2017-09-11 2017-11-24 中国矿业大学 One kind instructs fully mechanized mining machine top coal recovery method
CN112360527A (en) * 2020-11-11 2021-02-12 中国矿业大学 Anchoring agent compaction device, anchor rod and using method

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AU2017317602A1 (en) 2018-06-21
RU2688714C1 (en) 2019-05-22
AU2017317602B2 (en) 2019-08-08
CN106593424A (en) 2017-04-26
CN106593424B (en) 2019-09-10
WO2018103325A1 (en) 2018-06-14

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