CN105021457B - A kind of test and evaluation method for deep tight roof Burst Tendency of Coal Seam - Google Patents
A kind of test and evaluation method for deep tight roof Burst Tendency of Coal Seam Download PDFInfo
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- 239000011435 rock Substances 0.000 claims abstract description 56
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Abstract
The invention discloses a kind of test and evaluation method for deep tight roof Burst Tendency of Coal Seam, it comprises the following steps：The step of pure coal test specimen of preparation standard, the pure rock test specimen of standard and standard coal petrography assembly test specimen；The step of calculating standard coal petrography assembly test specimen dump energy rate of release；The tendentious step of evaluation criteria coal petrography assembly test specimen.The standard coal petrography assembly test specimen of corresponding proportion is made according to the actual (real) thickness of live tight roof and coal body, pass through quantizing process, fully reflect the combined effect of coal petrography and the dimensional effect of assembly and significantly improved on impacting tendentious influence, the accuracy of evaluation result；And the present invention evaluates Burst Tendency of Coal Seam with coal petrography assembly dump energy rate of release, the time effect of remaining energy and destructive process when coal petrography destroys is taken into full account, overcome merely using one-sidedness existing for energy indexes and time to rupture index, solve the problems, such as to misjudge Burst Tendency from root and judge by accident.
Description
Technical field
The present invention relates to a kind of test and evaluation method for deep tight roof Burst Tendency of Coal Seam.
Background technology
Bump is that the coal rock deformation energy instantaneous relase for inducing high intensity is adopted in mine, is caused by force accordingly adopting space
Strong country rock vibrations and the phenomenon of extrusion.China's coal-mine mining depth is increased with about 10 meters every year of speed, what bump occurred
Frequency and intensity gradually increase, it has also become restrict one of major casualty of China's Mine Safety in Production.
Practice have shown that bump is not to have generation in all mines, it generally requires coal petrography stone and meets one
Fixed physical property condition, i.e., with Burst Tendency.Coal petrography stone Burst Tendency is bigger, and the danger that bump occurs is higher.
To weigh whether coal petrography has the size of Burst Tendency and Burst Tendency, domestic and foreign scholars are respectively from energy, time to rupture
Many indexes are proposed with rigidity etc., such as：It is strong to play performance indications, impact energy index, dynamic destruction time, uniaxial compressive
Degree, ratio of rigidity index etc., these indexs have greatly promoted the development of impact orientation theory, are the prediction of bump
And certain basis has been established in preventing and treating.
However, bump be roof and floor, coal seam under the stress of primary rock and mine mining induced stress collective effect, power and energy
Discontinuously transmitting and cause the discontinuous result of displacement deformation, the not simple Burst Tendency depending on coal seam occurs in it,
Combining form, architectural feature, environmental effect, rock property more with coal rock layer etc. are closely related.Therefore, the phase of country rock and coal body
Interaction, it is that one of important factor in order of bump can occur, particularly deep tight roof condition, in evaluation coal seam
During Burst Tendency, the interaction for ignoring tight roof and coal body is likely to cause to underestimate Burst Tendency of Coal Seam, gives
The safe working of mine hides some dangers for.Theoretical research and field practice show, for being deposited above deep fractures, especially coal seam
In the condition of tight roof, when being evaluated with the Burst Tendency index in coal seam its shock hazard merely, often occur
" underestimating " phenomenon, it is difficult to provide accurate foundation for the prediction and preventing and treating of bump under the conditions of this.
Existing Burst Tendency evaluation method is more to start with from the single index such as energy, time to rupture, intensity, can not fill
Divide reflection this essence, there is sizable one-sidedness, easily cause misjudgement erroneous judgement.For example, there is identical dynamic destruction time
Coal body, during dump energy difference, its dynamic effect destroyed is different, and Burst Tendency is also different, only simple broken using dynamic
Bad time index is difficult to provide accurate judgement to such a situation.
The content of the invention
In view of above-mentioned the deficiencies in the prior art, one kind provided by the invention is used for deep tight roof Burst Tendency of Coal Seam
Test and evaluation method, to quantify the Burst Tendency in deep tight roof coal seam.
In order to solve the above technical problems, the present invention program includes：
A kind of test and evaluation method for deep tight roof Burst Tendency of Coal Seam, it comprises the following steps：
A, the step of preparing the pure coal test specimen of standard, the pure rock test specimen of standard and standard coal petrography assembly test specimen；
B, the step of calculating standard coal petrography assembly test specimen dump energy rate of release；
C, the tendentious step of evaluation criteria coal petrography assembly test specimen.
Described test and evaluation method, wherein, the step A specifically also includes：
The determination of coal sample, rock sample height in A1, standard coal petrography assembly test specimen
According to the specific geological conditions in coal seam to be determined, coal seam thickness H is obtained1And its thickness H of top tight roof2, point
The height h of coal sample in standard coal petrography assembly test specimen is not determined by following formula1With the height h of rock sample2；
Formula 1；
Formula 2；
A2, coal sample and rock sample processing
Obtain coal body and tight roof sillar to be determined and be transported to laboratory, produced using corning machine and cutting machine a diameter of
50mm, highly it is h1Coal sample and a diameter of 50mm, be highly h2Rock sample, coal sample and rock sample prepare three respectively, using coring
Machine and cutting machine produce a diameter of 50mm, are highly the 100mm pure coal test specimen of standard and the pure rock test specimen of standard, the pure coal test specimen of standard
Three are prepared respectively with the pure rock of standard；By all coal samples, rock sample, the pure coal test specimen of standard and the pure rock test specimen two of standard on Plane surface grinding machine
End polishes, it is desirable to both ends of the surface nonparallelism≤0.01mm, diameter deviation≤0.02mm；
A3, standard coal petrography assembly test specimen making
It is h by the height processed1Coal sample and height be h2Rock sample stick together to form integral structure, coal sample
Below rock sample, three a diameter of 50mm are made, are highly 100mm standard coal petrography assembly test specimen；
By the pure coal test specimen of the standard processed, the pure rock test specimen of standard and standard coal petrography assembly test specimen be divided into three groups it is to be measured
Group, every group includes the pure coal test specimen of a standard, the pure rock test specimen of a standard and a standard coal petrography assembly test specimen.
Described test and evaluation method, wherein, also include between the step A and the step B：The pure coal examination of standard
The compression test step of the pure rock test specimen of part, standard and standard coal petrography assembly test specimen：
Using rigid pressure testing machine, respectively to three groups of to be measured group of carry out uniaxial compression test, biaxial compression tests or more
Axle compression test, obtains three groups to be measured group of trial curve, and every group of trial curve includes standard coal petrography assembly test specimen
Answer the stress-strain for answering force-strain curve and the pure rock test specimen of a standard of force-time curve, the pure coal test specimen of a standard
Curve.
Described test and evaluation method, wherein, the step B specifically also includes：
B1, the peak strength of standard coal petrography assembly test specimen are σCWhen, the elastic strain energy Q of unit volume coal body accumulationSEC
For：
Formula 3；
In formula 3：σC--- the peak strength of standard coal petrography assembly test specimen, unit Pa；
EC--- the modulus of elasticity of coal, unit Pa；
B2, stress σCWhen, the elastic strain energy Q of unit volume rock mass accumulationSERFor：
Formula 4；
In formula 4：ER--- the modulus of elasticity of rock, unit Pa；
σC--- the peak strength of standard coal petrography assembly test specimen, unit Pa；
The energy that B3, destruction unit volume are in consumption needed for the coal body of peak stress is AX, its size is the pure coal of standard
The area that stress-strain diagram surrounds with strain axis behind test specimen peak；
B4, standard coal petrography assembly test specimen dump energy rate of release WZTCalculating：
Formula 5；
In formula 5：A --- the cross-sectional area of coal petrography assembly test specimen, unit m2；
DT--- the dynamic destruction time of coal petrography assembly test specimen, unit s.
Described test and evaluation method, wherein, the step C specifically also includes：
Calculate the dump energy rate of release W of three groups of to be measured group of Plays coal petrography assembly test specimensZT, take result of calculation three times
Average value be final WZTValue；
Using standard coal petrography assembly test specimen dump energy rate of release WZTWhen evaluating Burst Tendency of Coal Seam, it is classified mark
Standard is：Work as WZTWhen≤0, soft coal layer；When 0<WZTDuring≤0.5J/s, weak Burst Tendency；When 0.5<WZTDuring≤2J/s,
Medium impact tendentiousness；Work as WZT>During 2J/s, thump tendentiousness.
A kind of test and evaluation method for deep tight roof Burst Tendency of Coal Seam provided by the invention, according to existing
The actual (real) thickness of field tight roof and coal body makes the standard coal petrography assembly test specimen of corresponding proportion, according to standard coal petrography assembly
Its Burst Tendency of the properties evaluations of test specimen, when overcoming merely according to its Burst Tendency of the properties evaluations in coal seam, it is impossible to examine
Consider the deficiency of country rock and coal body interaction, by quantizing process, fully reflect the combined effect of coal petrography and the chi of assembly
Very little effect significantly improves on impacting tendentious influence, the accuracy of evaluation result；And the present invention is remaining with coal petrography assembly
Energyreleaserate evaluates Burst Tendency of Coal Seam, taken into full account remaining energy and destructive process when coal petrography destroys when
Between effect, overcome merely using one-sidedness existing for energy indexes and time to rupture index, solved from root to impact
The problem of tendentiousness misjudgement erroneous judgement, the present invention has the characteristics that simple, evaluation result is accurate, easy to utilize.
Brief description of the drawings
Fig. 1 is the structural representation of Plays coal petrography assembly test specimen of the present invention；
Fig. 2 is the schematic diagram for answering force-time curve of Fig. 1 Plays coal petrography assembly test specimens；
Fig. 3 is the structural representation of the pure coal test specimen of Plays of the present invention；
Fig. 4 is the schematic diagram for answering force-strain curve of the pure coal test specimen of Fig. 3 Plays；
Fig. 5 is the structural representation of the pure rock test specimen of Plays of the present invention；
Fig. 6 is the schematic diagram for answering force-strain curve of the pure rock test specimen of Fig. 5 Plays.
Embodiment
The invention provides a kind of test and evaluation method for deep tight roof Burst Tendency of Coal Seam, to make this
The purpose of invention, technical scheme and effect are clearer, clear and definite, and the present invention is described in more detail below.It should be appreciated that this
The specific embodiment of place description is not intended to limit the present invention only to explain the present invention.
In order to which more explanation is of the invention in detail, it is exemplified below more detailed embodiment and illustrates.
Certain ore deposit 3# coal seams buried depth 856-1137m, coal seam development is stable, simple in construction, thickness 5-9m, average thickness H1For
6.8m.Directly top is the siltstone of hard and compact above coal seam, and uniaxial compressive strength is about 78.5MPa, average thickness H2For
13.2m。
Above-mentioned 3# coal seams belong to typical deep tight roof condition coal seam, are tested and evaluated its punching using the inventive method
It is as follows to hit tendentious step：
In standard coal petrography assembly test specimen needed for laboratory test, the height h of coal1With the height h of rock2It is thick by coal seam to be determined
Spend H1And its thickness H of top tight roof2It is determined that：
Obtain and judge that coal body and hard siltstone sillar are transported to laboratory, diameter is produced using corning machine and cutting machine respectively
For 50mm, be highly h1The coal sample of (0.034m) and a diameter of 50mm, highly it is h2Each 3 of the rock sample of (0.066m), and diameter
The pure coal test specimen of the standard for being for 50mm, highly 100mm and each 3 of the pure rock test specimen of standard.Test specimen two ends are polished on Plane surface grinding machine,
It is required that both ends of the surface nonparallelism≤0.01mm, diameter deviation≤0.02mm.
Use AB seccotines by the height processed for h1The coal sample and height of (0.034m) are h2The rock sample of (0.066m) sticks
It is combined, forms integral structure, coal sample is made 3 a diameter of 50mm, is highly 100mm standard coal below rock sample
Rock assembly test specimen.
By the pure coal test specimen of process 9 standards, the pure rock test specimen of standard and standard coal petrography assembly test specimen be divided into 3 groups it is to be measured
Group, every group to be measured group includes the pure coal test specimen of 1 standard, the pure rock test specimen of 1 standard and 1 standard coal petrography assembly test specimen.Using
MTS815 electro-hydraulic servos pressure pilot system carries out uniaxial compression test to every group of standard specimen respectively, respectively obtains the examination of each group
Curve is tested, to be measured group of one of which is chosen and is tested, specifically as shown in 2, Fig. 4 and Fig. 6.
According to Fig. 2, the peak strength σ of standard coal petrography assembly test specimenCFor 18.9MPa, dynamic destruction time DTFor 329ms.
According to Fig. 4, the elastic modulus E of coalCFor 3.5GPa, destroy unit volume and be in consumption needed for the coal body of peak stress
Energy AXFor 3.58 × 104J/m3.The pure coal test specimen stress of standard is σCWhen, the elastic strain energy Q of unit volume coal body accumulationSEC
For：
According to Fig. 6, the elastic modulus E of rockRFor 21.8GPa, test specimen stress is σCWhen, the elasticity of unit volume rock mass accumulation
Strain energy QSERFor：
A diameter of 50mm of standard coal petrography assembly test specimen, its cross-sectional area A are 0.0019635m2, then coal petrography assembly
Dump energy rate of release WZTFor：
According to another two groups to be measured group of trial curve, standard coal petrography assembly test specimen dump energy rate of release W is calculated to obtainZT
Respectively 0.6425J/s, 0.6508J/s, the average value calculated three times is taken to obtain, the release of standard coal petrography assembly test specimen dump energy
Speed WZTFinal calculated value be 0.6415.
Therefore, medium impact tendentiousness is had according to its grade scale, ore deposit 3# coal seams.
Certainly, described above is only presently preferred embodiments of the present invention, and the present invention is not limited to enumerate above-described embodiment, should
When explanation, any those skilled in the art are all equivalent substitutes for being made, bright under the teaching of this specification
Aobvious variant, all falls within the essential scope of this specification, ought to be protected by the present invention.
Claims (4)
1. a kind of test and evaluation method for deep tight roof Burst Tendency of Coal Seam, it comprises the following steps：
A, the step of preparing the pure coal test specimen of standard, the pure rock test specimen of standard and standard coal petrography assembly test specimen；
B, the step of calculating standard coal petrography assembly test specimen dump energy rate of release；
C, the tendentious step of evaluation criteria coal petrography assembly test specimen；
The step A specifically also includes：
The determination of coal sample, rock sample height in A1, standard coal petrography assembly test specimen
According to the specific geological conditions in coal seam to be determined, coal seam thickness H is obtained1And its thickness H of top tight roof2, respectively by
Following formula determines the height h of coal sample in standard coal petrography assembly test specimen1With the height h of rock sample2；
A2, coal sample and rock sample processing
Obtain coal body and tight roof sillar to be determined and be transported to laboratory, using corning machine and cutting machine produce a diameter of 50mm,
Highly it is h1Coal sample and a diameter of 50mm, be highly h2Rock sample, coal sample and rock sample prepare three respectively, using corning machine and
Cutting machine produce a diameter of 50mm, be highly 100mm the pure coal test specimen of standard and the pure rock test specimen of standard, the pure coal test specimen of standard and mark
Accurate pure rock test specimen prepares three respectively；By all coal samples, rock sample, the pure coal test specimen of standard and the pure rock test specimen two of standard on Plane surface grinding machine
End polishes, it is desirable to both ends of the surface nonparallelism≤0.01mm, diameter deviation≤0.02mm；
A3, standard coal petrography assembly test specimen making
It is h by the height processed1Coal sample and height be h2Rock sample stick together to form integral structure, coal sample is in rock
Below sample, three a diameter of 50mm are made, are highly 100mm standard coal petrography assembly test specimen；
The pure coal test specimen of the standard processed, the pure rock test specimen of standard and standard coal petrography assembly test specimen are divided into three groups to be measured group, often
Group includes the pure coal test specimen of a standard, the pure rock test specimen of a standard and a standard coal petrography assembly test specimen.
2. test and evaluation method according to claim 1, it is characterised in that between the step A and the step B also
Including：The compression test step of the pure coal test specimen of standard, the pure rock test specimen of standard and standard coal petrography assembly test specimen：
Using rigid pressure testing machine, respectively to three groups of to be measured group of carry out uniaxial compression tests, biaxial compression test or multiaxis pressure
Contracting experiment, obtains three groups to be measured group of trial curve, and what every group of trial curve included standard coal petrography assembly test specimen should
Power-time graph, the pure coal test specimen of a standard answer the stress of force-strain curve and the pure rock test specimen of a standard-strain bent
Line.
3. test and evaluation method according to claim 1, it is characterised in that the step B specifically also includes：
B1, standard coal petrography assembly test specimen peak strength are σCWhen, the elastic strain energy Q of unit volume coal body accumulationSECFor：
In formula 3：σC--- the peak strength of standard coal petrography assembly test specimen, unit Pa；
EC--- the modulus of elasticity of coal, unit Pa；
B2, stress σCWhen, the elastic strain energy Q of unit volume rock mass accumulationSERFor：
In formula 4：ER--- the modulus of elasticity of rock, unit Pa；
σC--- the peak strength of standard coal petrography assembly test specimen, unit Pa；
The energy that B3, destruction unit volume are in consumption needed for the coal body of peak stress is AX, its size is the pure coal test specimen peak of standard
The area for answering force-strain curve to be surrounded with strain axis afterwards；
B4, standard coal petrography assembly test specimen dump energy rate of release WZTCalculating：
In formula 5：A --- the cross-sectional area of coal petrography assembly test specimen, unit m2；
DT--- the dynamic destruction time of coal petrography assembly test specimen, unit s.
4. test and evaluation method according to claim 3, it is characterised in that the step C specifically also includes：
Calculate the dump energy rate of release W of three groups of to be measured group of Plays coal petrography assembly test specimensZT, take the flat of result of calculation three times
Average is final WZTValue；
Using standard coal petrography assembly test specimen dump energy rate of release WZTWhen evaluating Burst Tendency of Coal Seam, its grade scale
For：Work as WZTWhen≤0, soft coal layer；When 0<WZTDuring≤0.5J/s, weak Burst Tendency；When 0.5<WZTDuring≤2J/s, in
Deng Burst Tendency；Work as WZT>During 2J/s, thump tendentiousness.
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| CN105223093A (en) * | 2015-11-12 | 2016-01-06 | 辽宁工程技术大学 | Based on coal body Burst Tendency experimental provision and the method for drilling hole burst equivalent stress |
| CN106501039A (en) * | 2016-10-20 | 2017-03-15 | 山东科技大学 | Judge the tendentious method of coal body relative impact |
| CN107328643B (en) * | 2017-06-20 | 2019-05-28 | 山东科技大学 | Under dead load in coal petrography assembly test specimen coal dynamic characteristic test method |
| CN107402288A (en) * | 2017-08-18 | 2017-11-28 | 中国矿业大学(北京) | A kind of coal Burst Tendency method of testing based on stratification effect |
| CN109025995B (en) * | 2018-09-03 | 2023-06-09 | 中国矿业大学(北京) | Underground coal body strength penetration testing device and method |
| CN109915139B (en) * | 2019-04-01 | 2020-07-24 | 安徽理工大学 | Hard coal seam mining method for balancing energy to induce plastic damage and preventing power damage |
| CN111323557B (en) * | 2020-03-09 | 2022-06-10 | 山东科技大学 | Composite coal rock roof fracturing extraction simulation test method under true three-dimensional stress |
| CN111323307B (en) * | 2020-03-09 | 2021-06-25 | 山东科技大学 | Multi-coal-seam combined fracturing, pressure relief and extraction integrated test method |
| CN111289388B (en) * | 2020-03-24 | 2022-04-29 | 山东科技大学 | Coal-rock combination impact tendency evaluation method considering damage effect |
| CN112268817B (en) * | 2020-10-26 | 2024-04-09 | 长安大学 | Rock shearing fracture discrimination method in normal unloading direct shear test |
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