CN108507708A - A kind of drilling in coal and rock stress measurement device and its measurement method - Google Patents
A kind of drilling in coal and rock stress measurement device and its measurement method Download PDFInfo
- Publication number
- CN108507708A CN108507708A CN201810298393.7A CN201810298393A CN108507708A CN 108507708 A CN108507708 A CN 108507708A CN 201810298393 A CN201810298393 A CN 201810298393A CN 108507708 A CN108507708 A CN 108507708A
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- drilling
- shell
- coal
- stress
- elastomer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/04—Measuring force or stress, in general by measuring elastic deformation of gauges, e.g. of springs
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/12—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress
Abstract
Patent of the present invention belongs to coal mine roadway aeration technology field, and in particular to a kind of drilling in coal and rock stress measurement device and its measurement method.It utilizes cantilever beam structure, when can measure coal petrography stress variation its a little at stress variation size, to calculate plane minimax principal stress, then principal direction of stress determined by Magnetic Sensor.Technical scheme of the present invention includes shell, water-proof cable clamp is provided at the top of shell, bottom is provided with preceding plug, and reinforcement platform has uniformly been provided projectingly on the circumference of the shell, reinforces being provided with hole on platform, balance beam sensor is provided in shell, dynamometry part is connected on balance beam sensor, dynamometry part stretches out in shell by reinforcing the hole on platform, elastomer is provided on the reinforcement platform, elastomer is connect with dynamometry part, is then measured using certain measurement method.
Description
Technical field
Patent of the present invention belongs to coal mine roadway aeration technology field, and in particular to a kind of drilling in coal and rock stress measurement device and
Its measurement method.
Background technology
Drilling in coal and rock stress monitoring is at present in mine using more and more extensive, such as seam mining Seam Roof And Floor is answered
The variation of power, the bearing stress variation of prearranged pillar, water barrier stress variation etc..Drilling hole stress monitoring is to measure to cause because adopting
Coal seam or rock stratum stress variation, be research one of the important means of stope dynamic pressure action rule, can be used for stope percussive pressure
Water disasters type caused by initial stage prediction and trend analysis and water barrier stress variation.
Drilling in coal and rock stress measurement at present is predominantly first punched, and then by sensor load hole, then to pour into cement mortar close
Envelope, or the method using epoxy resin foaming sealing.These methods have the following problems in actual use：
1, cement mortar pours into it cannot be guaranteed that filling tight and can not pour into upward；
2, after epoxy resin filling, elasticity modulus and coal, lithofacies difference are larger, can not accurately measure coal, rock stress
Variation.
3, there is sensor after mounting does not have primary stress, and can not differentiate the positive and negative variation of coal petrography stress.
It 4, can not Judge plane principal direction of stress.
To solve the above problems, develop it is a kind of it is easy for installation, without grouting sealing, installation after have certain primary stress and
The measurement method that plane principal direction of stress can be measured is very necessary.
Invention content
In view of this, a kind of drilling in coal and rock stress measurement device of present invention offer and its measurement method, utilize cantilever beam
Structure, when can measure coal petrography stress variation its a little at stress variation size, to calculate plane minimax principal stress,
Principal direction of stress is determined by Magnetic Sensor again.
In order to solve the problems existing in the prior art, the technical scheme is that：A kind of drilling in coal and rock stress measurement device,
It is characterized in that：Including shell, water-proof cable clamp is provided at the top of shell, bottom is provided with preceding plug, the shell
Circumference on be uniformly provided projectingly reinforcement platform, reinforce being provided with hole on platform, balance beam sensor, equalizer bar be provided in shell
Dynamometry part is connected on sensor, dynamometry part stretches out in shell by reinforcing the hole on platform, bullet is provided on the reinforcement platform
Property body, elastomer are connect with dynamometry part.
The shape of the elastomer is " M " type column, material 65Mn, and hardness is HRC48 or so, elastic modulus E=
2.1*105Mpa。
The reinforcement platform is provided with 3.
The shell is hollow column.
The balance beam sensor is set to by sensor fixed seat in shell.
The contact surface of the dynamometry part and balance beam sensor is 1cm2。
It is installed with " L " template in the shell, Magnetic Sensor and circuit main board are provided on " L " template, aequum passes
Sensor is set on " L " template.
A kind of drilling in coal and rock stress measurement measurement method is：
According to the drilling of different-diameter, the elastomer of different size is selected, measuring device is positioned over to the brill of different size
In hole, when drilling hole stress changes, elastomer is squeezed or stretches, and power is transmitted to flat cross by elastomer and dynamometry part
On beam sensor, three power for measuring of balance quantity sensors change, by the variation of its principal stress size is calculated, then
The direction of principal stress is measured by Magnetic Sensor.
Compared with prior art, advantages of the present invention is as follows：
1) present invention is easy for installation simple and direct, does not need grout filling；
2) there is certain primary stress after present invention installation, the variable quantity of the positive and negative variation of coal petrography stress can be measured, measure accurate
Really；
3) present invention is adapted to different-diameter drilling hole stress measure of the change；
4) installation direction of the present invention is unrestricted；
5) direction of the measurable plane principal stress of the present invention.
Description of the drawings
Fig. 1 is the structural schematic diagram of invention；
Fig. 2 is measuring device cross-sectional view；
Fig. 3 is parameter scale diagrams；
Fig. 4 is principal stress schematic diagram；
Fig. 5 is two dimensional stress state exploded view；
Fig. 6 is elastomer stress exploded view；
Fig. 7 is corner amount of deflection schematic diagram；
Fig. 8 is elastomer diameter and amount of deflection relational graph；
Fig. 9 is elastomer diameter and angle relation figure；
In figure, 1, elastomer 2, tooling shell 3, water-proof cable clamp 4, preceding plug 5, reinforce platform 6, equalizer bar pass
Sensor 7, dynamometry part 8, sensor fixed seat 9, circuit main board 10, Magnetic Sensor.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present embodiment provides a kind of drilling in coal and rock stress measurement device (referring to Fig. 1 and Fig. 2), including it is hollow columnar outer
Shell 2, the top of shell 2 are provided with water-proof cable clamp 3, and bottom is provided with preceding plug 4, on the circumference of the shell 2 uniformly
3 reinforcement platforms 5 have been provided projectingly, have reinforced being provided with hole on platform 5,3 balance beam sensors 6 are provided in shell 2, it is each to balance
It is connected with dynamometry part 7 on beam sensor 6, dynamometry part 7 stretches out in shell 2 by reinforcing the hole on platform 5, on the reinforcement platform 5
It is provided with elastomer 1, elastomer 1 is connect with dynamometry part 7.
The shape of the elastomer 1 is " M " type column, material 65Mn, and hardness is HRC48 or so, elastic modulus E=
2.1*105Mpa。
The contact surface of the dynamometry part 7 and balance beam sensor 6 is 1cm2。
The balance beam sensor 6 is set to by sensor fixed seat 8 in shell 2.
It is installed with " L " template in the shell 2, Magnetic Sensor 10 and circuit main board 9 are provided on " L " template, balances
Quantity sensor 6 is set on " L " template.
A kind of drilling in coal and rock method for measuring stress is：
According to the drilling of different-diameter, the elastomer of different size is selected, measuring device is positioned over to the brill of different size
In hole, when drilling hole stress changes, elastomer 1 is squeezed or stretches, and power is transmitted to by elastomer 1 and dynamometry part 7
On flat crossbeam sensor 6, the power that three balance quantity sensors 6 are measured changes, by its principal stress size is calculated
Change, then measures the direction of principal stress by Magnetic Sensor 10.The computational methods of principal stress are as follows：
Referring to Fig. 3：The size of each component is：A is elastomer angle, and L is one edge lengths of elastomer, and d is elastomer diameter,
S is the area of elastomer top disc, and n is the distance on vertex in minimum point to screw above elastomer, and i is the length of screw, h
For the height of dynamometry part.
Referring to Fig. 6：Elastomer both ends stress is F1And F2, it is F that dynamometry part, which flattens and weighs the power of sensor,.
1) principal stress calculates
The gravity of measuring device is neglected, because elastomer is symmetrical structure, can be obtained by force analysis：
It drills and is with the direct stress p in elastomer contact face：
Since the contact area of dynamometry part 8 and balance beam sensor 7 is 1cm2Therefore the power measured by balance beam sensor 7
Size f and the relationship of drilling direct stress size p herein be：
Referring to Fig. 4：Three balance quantity sensors measure the direct stress p of three points of drillingx、py、pz。
Referring to Fig. 5：σxFor x-axis direct stress, σyFor y-axis direct stress, τxyShearing stress, αiBevel is gone to by x-axis is positive counterclockwise
For just when the exterior normal of face,For the direct stress on unit area dA.
It is obtained according to direct stress expression formula：
Simultaneous solves：
According to plane stress formula：
Direct stress：
Shearing stress：
Maximum principal stress σmaxWith minimum principal stress σminFor：
Principal direction of stress is：α=α0+αn ⑽
The value that maximum principal stress and minimum principal stress are measured with device, subtract after installation under original state maximum principal stress and
The value of minimum principal stress just obtains the variable quantity of its maximum principal stress and minimum principal stress.
2) dynamometry part structural analysis
Referring to Fig. 6：The power F that 6 top of elastomer is subject to1It is decomposed, f1To be parallel to the power of elastomer 6, f2It is vertical
In the power of elastomer 6.Elastomer 6 is in power f1And f2Under the action of generate deformation because referring to a=168.6 ° of Fig. 3 angles, therefore
f1Compare f2F can be ignored in very little1The compressive deformation generated on elastomer 6, referring to Fig. 7 f2What is generated on elastomer turns
Angle A (radian) and amount of deflection Y (rice) are：
In formula, L is the length of stressed member, and E is elasticity modulus, and d is disc diameter, and a, b are the length and width of rectangular surfaces.
The design consider actual installation the problem of, spring body use length for 0.1m, it is wide and it is high be 0.01m, measurement
The ranging from specification of 0~1.5KN.The angle a of elastomer is 168.6 °, elastic modulus E=2.1*105Mpa.Three equalizer bars pass
The circumscribed circle diameter of sensor is 28.86mm.
For elastomer when being acted on by power, elastomer and aequum sensor have amount of deflection.
It (10) calculates balance quantity sensor according to formula be fully loaded with (when stress is 1.5KN), then its amount of deflection Y=generated
0.0028mm can be neglected.
According to the drilling size specification on current investigation coal mine, diameter is respectively 75mm, 90mm, 108mm.Needle is calculated below
When to the drilling of a diameter of 75mm, the length L and diameter d of elastomer.
It is 0.1m to take the length of elastomer, (11), (12), is (13) obtained elastomer in aequum full load (stress according to formula
1.5KN) its elastomer diameter and the relationship of corner A and amount of deflection Y are respectively：
Y=2.413*10-11/d4 ⑿
A=3.619*10-10/d4Being converted into angle is：3.619*10-10*(180/π)/d4⒀
(12), (13) drawn out respectively according to formula referring to Fig. 8 elastomer diameter d and corner a relationship and referring to Fig. 9 diameters d with
The relationship of amount of deflection Y.
Because elastomer angle a is 168.6 °, therefore when corner is more than 5.7 °, elastomer has just been pressed into arch, then
Stress point can change, so elastomer corner should not exceed 5.7 °.It obtains referring to Fig. 8 and Fig. 9 and drills for 75mm in outer diameter
When elastomer specification：I.e. in the drilling of a diameter of 75mm, a diameter of 8mm of elastomer is more suitable.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (8)
1. a kind of drilling in coal and rock stress measurement device, it is characterised in that：Including shell (2), shell is provided with waterproof at the top of (2)
Cable clamp (3), bottom are provided with preceding plug (4), reinforcement platform (5) have uniformly been provided projectingly on the circumference of the shell (2),
Reinforce being provided with hole on platform (5), balance beam sensor (6) is provided in shell (2), survey is connected on balance beam sensor (6)
Power part (7), dynamometry part (7) stretch out in shell (2) by reinforcing the hole on platform (5), are arranged on the reinforcement platform (5) flexible
Body (1), elastomer (1) are connect with dynamometry part (7).
2. a kind of drilling in coal and rock stress measurement device according to claim 1, it is characterised in that：The elastomer (1)
Shape be " M " type column, material 65Mn, hardness is HRC48 or so, elastic modulus E=2.1*105Mpa。
3. a kind of drilling in coal and rock stress measurement device according to claim 1 or 2, it is characterised in that：The reinforcement platform
(5) 3 are provided with.
4. a kind of drilling in coal and rock stress measurement device according to claim 3, it is characterised in that：The shell (2) is
Hollow column.
5. a kind of drilling in coal and rock stress measurement device according to claim 4, it is characterised in that：The equalizer bar sensing
Device (6) is set to by sensor fixed seat (8) in shell (2).
6. a kind of drilling in coal and rock stress measurement device according to claim 5, it is characterised in that：The dynamometry part (7)
Contact surface with balance beam sensor (6) is 1cm2。
7. a kind of drilling in coal and rock stress measurement device according to claim 6, it is characterised in that：In the shell (2)
It is installed with " L " template, Magnetic Sensor (10) and circuit main board (9) are provided on " L " template, balance quantity sensor (6) is set to
On " L " template.
8. a kind of drilling in coal and rock method for measuring stress according to claim 1, it is characterised in that：The measurement method
For：
According to the drilling of different-diameter, the elastomer of different size is selected, measuring device is positioned in the drilling of different size,
When drilling hole stress changes, elastomer (1) is squeezed or stretches, and power is transmitted to by elastomer (1) and dynamometry part (7)
On flat crossbeam sensor (6), the power that three balance quantity sensors (6) are measured changes, big by its principal stress is calculated
Small variation, then measure by Magnetic Sensor (10) direction of principal stress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810298393.7A CN108507708B (en) | 2018-03-30 | 2018-03-30 | Coal rock drilling stress measuring device and measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810298393.7A CN108507708B (en) | 2018-03-30 | 2018-03-30 | Coal rock drilling stress measuring device and measuring method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108507708A true CN108507708A (en) | 2018-09-07 |
| CN108507708B CN108507708B (en) | 2020-10-23 |
Family
ID=63380625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810298393.7A Active CN108507708B (en) | 2018-03-30 | 2018-03-30 | Coal rock drilling stress measuring device and measuring method thereof |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458062A (en) * | 2020-04-10 | 2020-07-28 | 水利部交通运输部国家能源局南京水利科学研究院 | Instrument for automatically measuring three-dimensional frost heaving force of channel and measuring and mounting method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3624684A (en) * | 1969-11-19 | 1971-11-30 | Us Interior | Borehole deformation gage |
| CN2056696U (en) * | 1989-06-02 | 1990-05-02 | 中国矿业大学 | Multi-point displacement metre for drilling hole |
| CN101566452A (en) * | 2009-05-22 | 2009-10-28 | 中国矿业大学 | Rotary disc deep base point displacement meter and measuring method thereof |
| CN102183230A (en) * | 2010-12-27 | 2011-09-14 | 北京工业大学 | An anchoring device of a datum mark in a boring |
| CN202041167U (en) * | 2011-01-27 | 2011-11-16 | 中国科学院武汉岩土力学研究所 | Three-way deformation measuring device for surrounding rock in drilling hole |
| CN102507049A (en) * | 2011-10-28 | 2012-06-20 | 西安欣源测控技术有限公司 | Drill hole vector stress sensor for mine |
| CN103556992A (en) * | 2013-10-25 | 2014-02-05 | 中国矿业大学 | Optical fiber grating ground stress obtaining method |
| CN204086563U (en) * | 2014-09-12 | 2015-01-07 | 长沙有色冶金设计研究院有限公司 | In acoustic emission sensor on mine boring, the fixing integrating device with reclaiming is installed |
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| CN105927219A (en) * | 2016-06-30 | 2016-09-07 | 华北科技学院 | Device for detecting stress distribution condition in front of excavation working face |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458062A (en) * | 2020-04-10 | 2020-07-28 | 水利部交通运输部国家能源局南京水利科学研究院 | Instrument for automatically measuring three-dimensional frost heaving force of channel and measuring and mounting method thereof |
| CN111458062B (en) * | 2020-04-10 | 2022-03-04 | 水利部交通运输部国家能源局南京水利科学研究院 | Instrument for automatically measuring three-dimensional frost heaving force of channel and measuring and mounting method thereof |
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| Publication number | Publication date |
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| CN108507708B (en) | 2020-10-23 |
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