CN109918696A - A kind of classification method and device of bump strength grade - Google Patents
A kind of classification method and device of bump strength grade Download PDFInfo
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Abstract
This application discloses the classification method and device of a kind of bump strength grade, classification method obtains coal body failure loss energy the following steps are included: being based on coal body Damage Constitutive Model, determines bump the first strength grade cut off value；It is dished out energy based on the coal body failure loss energy and broken coal body first, determines bump the second strength grade cut off value；The energy relationship of surface wave magnitude based on protolith coal body gross energy and setting determines that bump is equivalent to the third strength grade cut off value of the surface wave magnitude of the setting.
Description
Technical field
The present disclosure relates generally to hazards control technical field more particularly to a kind of points of bump strength grade
Class method and device.
Background technique
Increasing with coal mining depth and mining rate, the frequency that mine motive force disaster occurs also increases therewith
More, for bump mine, bump dynamic disaster is the most important thing of Safety of Coal Mine Production.Bump is in coal
When rock mass energy meets or exceeds bump transition energy, the elasticity that coal and rock is built up can discharge suddenly, and coal and rock is thrown
Out, along with the strong sound, underground equipment, underground engineering space are damaged, or even causes to hurt to underground work personnel
It dies.In addition, bump generation can also have an impact other mine disasters.Since bump genesis mechanism is complicated, and by
Geological conditions and mining conditions are affected, thus to impact ground pressure research be guarantee Safety of Coal Mine Production important topic it
One.
Mainly there are rigidity theory, strength theory, impact in domestic and international academia about the research of bump genesis mechanism at present
Tendency is theoretical, with pressing genesis mechanism research more deep impact, further proposes three criterion theory, shearing is slided
Theoretical, " three factors " theory and deformation instability theory etc. are moved, coal mine rock burst is prevented and treated and guaranteed safe production playing
Very important effect.(1) rigidity theory: after pressure testing machine occurs, Petukhov and Cook and Digest have found at first
Bump can be described with dynamic failure of the rock sample on the lesser flexibility test machine of rigidity, and then propose punching
Press rigidity theory with hitting.Cook recognizes that bump is as caused by structural instability after proposing energy theory.
It is tested again using griotte further progress.Salaman, Brady and Petukhov etc. also ask the bump of multiple ore pillars
Topic is largely studied.(2) strength theory: strength theory viewpoint is when the load that coal and rock is born reaches its strength degree
When, coal and rock will start to destroy.Clamping coal body classical theory is proposed by Bu Huoyinuo.If at coal body-country rock interface
And coal body itself reaches capacity equilibrium condition, has just reached the strength condition of bump generation.But bump is also and coal
Rock mass destroy suddenly it is related, sometimes coal petrography destruction be not meant to that bump centainly occurs.(3) burst trend is theoretical: punching
It hits tendency theory to point out: if the burst trend degree K of coal and rockE≥KECWhen, then impact failure may occur for coal and rock.(4) three
Criterion is theoretical: Li Yusheng points out that criterion of strength is coal body failure criteria, and energy criteria and burst trend criterion are broken suddenly
Bad criterion, proposing bump genesis mechanism can be described by criterion of strength, energy criteria and Burst Tendency criterion, when
When three criterion all meet, bump will occur.(5) " three factors " is theoretical: neat celebrating is new etc. think bump occur by
Three factors influence, coal and rock internal factor, exploitation engineering energy source factor and structural factor.Impact ground is proposed accordingly
Pressure raw " three factors " is theoretical.(6) deformation instability is theoretical: Zhang Mengtao thinks that bump is coal and rock to enter peak value strong
The strain softening phenomenon occurred after degree is based on FInite Element, establishes mathematical model, presses carry out quantitative study to impact.
In conclusion all carrying out analytic demonstration, needle from different angles for Mechanics of Rockburst research domestic and foreign scholars
The description that system is also given to different geology dynamic conditions achieves the achievements and experiences of many preciousnesses.
Currently, the energy theory analysis and research about coal and rock impact failure are more, but most of these energy theories are all
It is to be studied from same starting point, it may be assumed that the energy discharged when coal and rock impact failure process destroys consumed with it
Size relation between various energy, remaining energy provides energy for bump after coal and rock is destroyed.However,
It is more to the raw influence factor of impact ground pressure due to Mechanics of Rockburst complexity, in the prior art, impact ground can not be disclosed comprehensively
Pests occurrence rule and mechanism are pressed, is more classified without a kind of method of science to the bump strength grade of generation.
Summary of the invention
In view of drawbacks described above in the prior art or deficiency, it is intended to provide a kind of bump strength grade of science
Classification schemes.
In a first aspect, the embodiment of the present application provides a kind of classification method of bump strength grade, including following step
It is rapid:
Coal body failure loss energy is obtained based on coal body Damage Constitutive Model, determines the first strength grade of bump point
Dividing value；
It is dished out energy based on the coal body failure loss energy and broken coal body first, determines the second intensity of bump
Ranking score dividing value；
It is described to determine that bump is equivalent to for the energy relationship of surface wave magnitude based on protolith coal body gross energy and setting
The third strength grade cut off value of the surface wave magnitude of setting.
The corresponding coal body failure loss energy is expressed by corresponding energy density, broken coal body first is dished out
Energy and coal body protolith energy can calculate the coal body gross energy of corresponding region according to different situations, be able to achieve quantitative pre-
Survey the intensity that bump occurs.
The formula of the coal body Damage Constitutive Model are as follows:
Y is damage power consumption rate；
σ is stress；
E is elasticity modulus；
D is damage variable, indicates unit volume micro-crack number；
DEFor the impairment value in the complete rupture failure of position E；
DDFor the impairment value in the complete rupture failure of position D；
UDEnergy is consumed for coal petrography bulk damage.
Damage variable in the coal body Damage Constitutive Model is closed by the stress-strain testing of coal body in the mine
System determines.Wherein, the matched curve of coal and rock Damage Constitutive Model, damage variable curved line relation are established, using Matlab software meter
The energy for calculating the loss of mine coal rock mass damage is the state of the art.According to the extension of coal and rock micro-crack, internal exergy dissipation
The development and evolution and distribution Close relation of wound, establish coal and rock damage model, can consider when establishing model:
(1) coal petrography bulk damage is to carry out under elasticity and the coupling of damage on the direction of the principal axis of stress, be considered as damage
The main diagonal matrix of tensor；
(2) coal and rock damage development should there are power function relationships with stress or strain, and damage variable can be by interior
Stretching strain macroscopic physical quantity reflects.
The broken coal body first dish out broken coal body corresponding to energy dish out speed be 8-12m/s.Damage mechanics
The energy lost when coal body destroys can be obtained according to the lithology of coal and rock；And broken coal body dishes out energy then according to coal body
The difference of speed when being spilled over, corresponding different dish out energy and its impact size, and then can predict different bumps
Intensity, when dish out speed ν≤1m/s when bump does not occur, and as ν >=10m/s, then bump occur to have compared with
A possibility that high.Under normal circumstances, the speed that can will dish out is set as 8-12m/s, to calculate transition energy formula.
The protolith coal body gross energy considers Modern Tectonic Stress Field, divides active fault by geology zoning methods, sentences
The disconnected control action to bump, can be obtained by theoretical calculation.Macroscopic analysis Modern tectonic stress is to bump
Energy inoculation(effect) proposes to classify to impact geostatic pressure degree grade using theories in geo-dynamical division method.
Protolith energy caused by the Modern Tectonic Stress Field includes that energy and tectonic stress be off field off field for weight stress
Energy,
Weight stress energy W off fieldZAre as follows:
In formula: E- elasticity modulus, GPa；
μ-cell cube Poisson's ratio；
γ-overlying rock volume-weighted average, KN/m3；
The depth of H- cell cube present position, m；
R- bump system scale radius, m.
Tectonic stress energy W off fieldGAre as follows:
In formula: k1The maximum principal stress factor of stress concentration；
k2The intermediate principal stress factor of stress concentration；
k3The minimum principal stress factor of stress concentration.
The deformation of region coal and rock and stress variation are protolith energy foundations under natural conditions, and protolith energy is mainly by certainly
The energy two parts composition of energy and tectonic stress off field under weight stress field.Since geological condition of coal mine is complicated and changeable, cause
Mining area structure and stress field Distribution Pattern are also relative complex.It therefore, be by mining depth, rift structure, Roof rock feature etc.
Analytical calculation is carried out to survey region stress of primary rock value size and distribution situation, and then to energy value size and is divided
Analysis calculates, and divides high-energy area, low energy area.
Pair based on protolith energy and the energy of the surface wave magnitude of the setting caused by the Modern Tectonic Stress Field
It should be related to, determine the bump system scale radius；Energy based on the protolith energy and/or the surface wave magnitude,
And the bump system scale radius, determine corresponding energy density as third strength grade cut off value.
Second aspect, the embodiment of the present application provide a kind of prediction meanss of Rock Burst intensity, described device packet
It includes:
Obtain module, for obtaining coal body Damage Constitutive Model, broken coal body dish out energy, protolith coal body gross energy and
The relevant parameter of the surface wave magnitude of setting；
Computing module is used for: being obtained coal body failure loss energy based on the coal body Damage Constitutive Model and is determined impact ground
The first strength grade cut off value is pressed, dishing out based on the coal body failure loss energy and broken coal body first, energy is determining to be impacted
Press the second strength grade cut off value, the energy relationship of the surface wave magnitude based on the protolith coal body gross energy and the setting in ground
Determine that bump is equivalent to the third strength grade cut off value of the surface wave magnitude of the setting.
Bump strength grade classification schemes provided by the embodiments of the present application are based on bump energy theory, from punching
It hits the raw root of ground pressure to start with, has investigated the relationship of bump Yu coal and rock energy, propose that protolith energy is impact ground
The raw main energetic of pressure, the strength grade for determining bump, rather than remaining energy is made after coal and rock is destroyed
The foundation of strength grade occurs for bump.This method can disclose bump pests occurrence rule and mechanism comprehensively, can be more quasi-
True classifies to the strength grade of bump, can just carry out the prediction of Controlling of Coal Outburst at mine construction initial stage
Sex work prevents and treats bump from the root.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application its
Its feature, objects and advantages will become more apparent upon:
Fig. 1 shows Elastic latent energy variation schematic diagram in working face front in the embodiment of the present application；
Fig. 2 shows coal and rock deformation failure stress-strain curves.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described.Obviously, described embodiment is
A part of the invention is instead of all the embodiments.
It should be noted that in the absence of conflict, the embodiment of the present invention for usually describing and showing in this figure
Component can arrange and design with a variety of different configurations.It is understood that specific embodiment described herein is only
It is only used for explaining related invention, rather than the restriction to the invention.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In addition, term " first ", " second ", " third " are used for description purposes only, it is not understood to indicate or imply phase
To importance.
As described in background technique, currently, the energy theory analysis and research about coal and rock impact failure are more, but this
Most of a little energy theories are studied from same starting point, it may be assumed that the energy discharged when coal and rock impact failure process
It measures and it destroys the size relation between consumed various energy, remaining energy is bump hair after coal and rock is destroyed
Life provides energy.However, in the prior art, there is no breed bump, develop, closing between energy in generating process
Influence of the stress of primary rock to bump is not considered in the correlative study of system especially.
The theoretical research result of the application is as follows:
Mine does not have the areal geology dynamic condition that Rock Burst occurs, and answers with adopting caused by recovery activity
Power intercouples, and so as to cause the increase of stress and the accumulation of energy, reaches the condition that Rock Burst occurs, to lure
Send out Rock Burst.In this homeostasis process, energy is focused first near coal wall, when energy value reaches coal body
Softening intensity after, softening transform occurs for coal body, makes that energy is concentrated to shift to coal body deep, after reaching new energy balance.When
When energy value being concentrated to be more than the damage Dissipated energy of coal body, coal body is destroyed, it may occur however that bump.
During working face extraction, energy accumulating area iterative method causes coal and rock broken, energy release.Define coal petrography
The energy that body gathers under initial field stress field action is protolith energy, uses UBIt indicates；The energy of coal petrography bulk damage consumption is UD；
The transition energy that bump occurs is UL；It is U with advance of the face coal and rock gross energy under mining conditionsT。
During working face extraction, gross energy U in coal and rockTIt is a continually changing variable.Coal and rock gross energy
UTEnergy with the consumption of coal petrography bulk damage is UDDifference be UT-D, its variation is it is possible that three kinds of possibilities as follows:
1. working as UT-D> 0 illustrates that the energy gathered in coal and rock is more than the energy of coal petrography bulk damage consumption, UT-DWith work
Face promotes and is continuously increased；
2. working as UT-D=0, illustrate that the energy gathered in coal and rock is equal with the energy that coal petrography bulk damage consumes, the product of energy
It is poly- to be in equilibrium state with dissipation；
3. working as UT-D< 0 illustrates the energy of coal petrography bulk damage consumption more than the energy gathered in rock mass, UT-DWith working face
Promoting constantly reduces.
Therefore, the variation of coal petrography energy i (in vivo) can be indicated by 1 representation model of attached drawing in front of working face, wherein UT-DFor UT
(coal and rock gross energy) and UDThe difference of (energy of coal petrography bulk damage consumption), ULFor the transition energy of bump.
Work as UT-DWhen > 0, illustrate that accumulated energy is greater than the energy to dissipate in coal and rock, energy is in ever-increasing
State.But as long as UT-D< UL, be all not in bump. UT-D-ULDifference it is bigger, risk is bigger.Work as UT-D=ULWhen,
If there is energy increase again, bump will occur.If UT-D> UL, and take danger releasing measures not in time to discharge energy
Amount, then during working face extraction, energy is further increased, it is possible to bump occur.
Work as UT-DWhen < 0, illustrate that accumulated energy is less than the energy to dissipate in coal and rock, coal and rock energy in coal and rock
It gradually discharges, energy is constantly reduced, UT-D-ULDifference it is increasing, risk also just it is smaller and smaller, in this case, do not adopt
With any danger releasing measures, bump danger will not occur.
Grady and Kipp (1980) proposes rock mass internal unit volume micro-crack number N and strain stress and answers being uniaxially stretched
Under power state, meet two-parameter (k and m) the Weibull regularity of distribution, such as formula (1).
According to the extension of coal and rock micro-crack, the development and evolution of internal injury and distribution Close relation, coal and rock is established
Damage model can consider when establishing model:
(1) coal petrography bulk damage is to carry out under elasticity and the coupling of damage on the direction of the principal axis of stress, be considered as damage
The main diagonal matrix of tensor；
(2) coal and rock damage development should there are power function relationships with stress or strain, and damage variable can be by interior
Stretching strain macroscopic physical quantity reflects；
Assume when one-dimensional coal and rock Establishing an injured model: rock under uniaxial tension state,
Tensile strain causes internal tiny crack to extend, therefore establishes the relationship between micro-crack number and tensile strain, uses formula
(2) it indicates.
N=∝ m εn (2)
In formula: the micro-crack number of N- unit volume；
ε-axial direction compressive strain, under single shaft effect, tensile strain is equal with compressive strain numerical value；
M, n- coal and rock parameter.
Unit volume micro-crack number is indicated with damaging parameter D, is indicated with formula (3).
In formula:Effective stress；σ-stress.
If:
Then:
It damages coal and rock constitutive relation formula (7).
E is elasticity modulus.
Therefore the EVOLUTION EQUATION of coal and rock damage variable is formula (8).
Impaired coal and rock elastic strain energy release rate d ΦeFormula (9), formula can be expressed as with damage power consumption rate Y
(10)。
According to effective stress concept and strain equivalence principle, coal petrography bulk damage release rate formula (11) can must be damaged.
For isotropic elastoplastic damage, damage variable is scalar.
Then:
If:
Then deviatoric stress tensor are as follows: Sij=σ-σHI (14)
Misses equal value stress is formula (15).
Formula (16) are obtained by formula (12).
In formula: StStress triaxial factor reflects the influence of triaxial stress ratio.
Wherein
Under simple stress,
Definition damage equal value stress are as follows:
Then:
With the increase of outer load, damage will continue to develop coal and rock, until rock is broken completely, theoretically work as D=
When 1, it is believed that the complete rupture failure of coal and rock, but it is many experiments have shown that, as D < 1, material has destroyed completely, such as the position Fig. 2 E,
Impairment value when being located at the complete rupture failure of position E is DE, then corresponding damage energy release rate is YE, in the D coal and rock of position
Portion's damage increases rapidly, causes strain softening to aggravate, starts to destroy inside coal and rock, then the energy of coal petrography bulk damage consumption is
Formula (21).
In following embodiments, the energy of the ravine Mu Cheng mine coal bulk damage consumption is calculated by derivation formula, according to the ravine Mu Cheng
Coal mine stress in coal bed-strain-gauge test curve has been fitted the strain-stress relation of pre-and post-peaking using Origin9.0 software segments
Formula.
It is established by load-deformation curve and is shown below with the relationship of D.
It is the starting point that coal body destroys when strain is 0.0117 according to load-deformation curve, coal body internal injury is rapid
Increase, start to destroy inside coal body, is that coal body has destroyed completely, therefore presses formula (23) when strain is 0.014, uses
It is 1.45 × 10 that Matlab software, which calculates the ravine Mu Cheng coal mine coal body failure loss energy,5J/m3。
When bump occurs, the energy U of one side coal body damage consumptionD, on the other hand it is crushed coal body and dishes out energy UF,
The energy and broken coal body the sum of energy of dishing out of coal body damage consumption are defined as bump transition energy, use ULIt indicates, calculates
Formula (25).Usual object of which movement using the speed of particle as measurement standard, dish out to free space flat by broken coal body
Equal initial velocity (ν) determines the kinetic energy that coal body generates.Bump does not occur as ν≤1m/s, and as ν >=10m/s, then
Possibility with higher occurs for bump.By transition energy calculation formula (25), can obtain energy density be 2.41 ×
105J/m3。
UL=UD+UF (25)
In the application, the purpose of each cut off value of bump strength grade is determined, as by UT-DWith each cut off value into
Row comparison, works as UT-DWhen the < the first strength grade cut off value, locating grade is no bump；When the first strength grade cut off value <
UT-DWhen the < the second strength grade cut off value, locating grade is weak bump；As the second strength grade cut off value < UT-D< third
When strength grade cut off value, locating grade is pressed for medium impact；UT-DWhen > third strength grade cut off value, locating grade is
Press to thump.
The classification method of bump strength grade provided by the embodiments of the present application, comprising the following steps:
Coal body failure loss energy is obtained based on coal body Damage Constitutive Model, determines the first strength grade of bump point
Dividing value；
It is dished out energy based on the coal body failure loss energy and broken coal body first, determines the second intensity of bump
Ranking score dividing value；
It is described to determine that bump is equivalent to for the energy relationship of surface wave magnitude based on protolith coal body gross energy and setting
The third strength grade cut off value of the surface wave magnitude of setting.
The formula of the coal body Damage Constitutive Model are as follows:
Y is damage power consumption rate；
σ is stress；
E is elasticity modulus；
D is damage variable, indicates unit volume micro-crack number；
DEFor the impairment value in the complete rupture failure of position E；
DDFor the impairment value in the complete rupture failure of position D；
UDEnergy is consumed for coal petrography bulk damage.
The corresponding coal body failure loss energy is obtained by corresponding energy density, broken coal body first is dished out
Energy and coal body protolith energy can calculate the coal body gross energy of corresponding region according to different situations, be able to achieve quantitative pre-
Survey the intensity that bump occurs.
Damage variable in the coal body Damage Constitutive Model is closed by the stress-strain testing of coal body in the mine
System determines.Wherein, the matched curve of coal and rock Damage Constitutive Model, damage variable curved line relation are established, using Matlab software meter
The energy for calculating the loss of mine coal rock mass damage is the state of the art.According to the extension of coal and rock micro-crack, internal exergy dissipation
The development and evolution and distribution Close relation of wound, establish coal and rock damage model, can consider when establishing model:
(1) coal petrography bulk damage is to carry out under elasticity and the coupling of damage on the direction of the principal axis of stress, be considered as damage
The main diagonal matrix of tensor；
(2) coal and rock damage development should there are power function relationships with stress or strain, and damage variable can be by interior
Stretching strain macroscopic physical quantity reflects.
The broken coal body first dish out broken coal body corresponding to energy dish out speed be 8-12m/s.Damage mechanics
The energy lost when coal body destroys can be obtained according to the lithology of coal and rock；And broken coal body dishes out energy then according to coal body
The difference of speed when being spilled over, corresponding different dish out energy and its impact size, and then can predict different bumps
Intensity, when dish out speed ν≤1m/s when bump does not occur, and as ν >=10m/s, then bump occur to have compared with
A possibility that high.Under normal circumstances, the speed that can will dish out is set as 8-12m/s, to calculate transition energy formula.
The protolith coal body gross energy considers Modern Tectonic Stress Field, divides active fault by geology zoning methods, sentences
The disconnected control action to bump, can be obtained by theoretical calculation.Macroscopic analysis Modern tectonic stress is to bump
Energy inoculation(effect) proposes to classify to impact geostatic pressure degree grade using theories in geo-dynamical division method.
Protolith energy caused by the Modern Tectonic Stress Field includes that energy and tectonic stress be off field off field for weight stress
Energy,
Weight stress energy W off fieldZAre as follows:
In formula: E- elasticity modulus, GPa；
μ-cell cube Poisson's ratio；
γ-overlying rock volume-weighted average, KN/m3；
The depth of H- cell cube present position, m；
R- bump system scale radius, m.
Tectonic stress energy W off fieldGAre as follows:
In formula: k1The maximum principal stress factor of stress concentration；
k2The intermediate principal stress factor of stress concentration；
k3The minimum principal stress factor of stress concentration.
Pair based on protolith energy and the energy of the surface wave magnitude of the setting caused by the Modern Tectonic Stress Field
It should be related to, determine the bump system scale radius；Energy based on the protolith energy and/or the surface wave magnitude,
And the bump system scale radius, determine corresponding energy density as third strength grade cut off value.
Second aspect, the embodiment of the present application provide a kind of prediction meanss of Rock Burst intensity, described device packet
It includes:
Obtain module, for obtaining coal body Damage Constitutive Model, broken coal body dish out energy, protolith coal body gross energy and
The relevant parameter of the surface wave magnitude of setting；
Computing module is used for: being obtained coal body failure loss energy based on the coal body Damage Constitutive Model and is determined impact ground
The first strength grade cut off value is pressed, dishing out based on the coal body failure loss energy and broken coal body first, energy is determining to be impacted
Press the second strength grade cut off value, the energy relationship of the surface wave magnitude based on the protolith coal body gross energy and the setting in ground
Determine that bump is equivalent to the third strength grade cut off value of the surface wave magnitude of the setting.
Embodiment 1
1 tectonic characteristic and characteristics of energy field
1.1 coal region construction and its active character
(1) bump energy source and the research of coal and rock failure energy
Macroscopic analysis geological structure, neotectonic movement and Modern tectonic stress are to impact ground pressure energy amount inoculation(effect), benefit
Bump risk is evaluated with theories in geo-dynamical division method；Energy turns when micro-analysis coal and rock deformation failure
Shifting and dissipation situation the characteristics of formation based on bump phenomenon, determine that transition energy density occurs for bump.
(2) mining area structure movement and protolith energy spectrometer
Based on Jingxi district coalfield structure stress field, energy field and crustal strain energy feature, analyzes in the field with "nine squares" of the ravine Mu Cheng and construct
Form and motion mode divide active fault using geology zoning methods, analyze it to impact to the control action of bump
Earth pres-sure control effect, calculates the protolith energy under the conditions of nature geology, based on bump transition energy density to energy
Division, divides three slots, the high-energy area in two slot coal seams and release area, analysis high-energy area to the control action of bump,
And then establish protolith energy and bump strength relationship.
(3) energy analysis is adopted under mining conditions
Feature is distinguished based on the protolith energy under natural conditions, using FLAC3D numerical simulation software, to three slots, two slots
Coal seam protolith energy accumulation area working face carries out simulation exploitation, and the activity of adopting is to working face front, coal column under analysis mining conditions
The influence of area's energy-distributing feature classifies to impact geostatic pressure degree.It is special based on working face front, coal column area Energy distribution
Bump intensity of seeking peace classification, and then the relationship of coal and rock energy and bump intensity under mining conditions is established, for
Different bump intensity areas take graduate prevention technique measure.
2 tectonic stress fields and characteristics of energy field
Seminar is in recent years by Jingxi district mining area ravine Mu Cheng coal mine, big peace mountain coal mine, the valley great Tai Jing, Chang Gou coal mine etc.
The research of project, geostress survey and energy values are the result shows that (table 3.1), In The West Mountain Area of Beijing maximum principal stress orientation are east northeast-
Thing, energy density maximum are 3.25 × 105J/m3, and energy density minimum value is 0.44 × 105J/m3, and energy density is flat
Mean value is 1.51 × 105J/m3.Research shows that tectonic movement is affected to Jingxi district coalfield Energy distribution, energy is of different sizes,
Since tectonic movement causes some region energies to gather, and some region energies discharge.Pass through the statisticals such as Zhao Dean, Jing Feng
The China Xi Liao stress database in large quantities calculates energy density according to crustal stress, obtains the Jingxi district being calculated according to formula
The comparison diagram of coalfield energy density and national energy density shows that Jingxi district coalfield energy density is higher than average national level, especially
It is more than buried depth 700m, the energy density in Jingxi district coalfield is more significant, and Jingxi district coalfield energy density distribution is uneven, shows
Jingxi district coalfield coal and rock bears more strong non-homogeneous energy environment, will carry out energy range to the ravine Mu Cheng field with "nine squares" region accordingly
It divides.
3 fields with "nine squares" position and construction overview
3.1 fields with "nine squares" position and traffic
The ravine Mu Cheng field with "nine squares" is located at Beijing western mountainous areas, is under the jurisdiction of Jingxi district coalfield, mining area across Fangshan, the Mentougou area Liang Ge.
3.2 coal measure stratas and roof and floor lithologic
(1) coal measure strata
Jurassic Series are kiln slope group, and maximum gauge can be more than 720m.Deposit lithology, lithofacies change cycle greatly
Complexity is made of sandstone, siltstone, shale rock and coal bed, folder conglomerate, tuffaceous sandstone etc..
(2) Seam Roof And Floor
Roof crack and abundant little faults in field with "nine squares", top plate is relatively broken, and roof and floor is uneven, to supporting requirement
It is higher.
3.3 field with "nine squares" Geologic Structure Features
The ravine Mu Cheng Jurassic Period field with "nine squares" is located in Jingxi district Miao Anling-west section child's hanging hair hair worn in a bun or coil the direction which a grave faces Xie Nan east southeast wing.A system is developed in field with "nine squares"
Column sunsidiary fold construction, main axis orientation in NE56 °~70 °, NE40 °~45 °, NE5 °~15 °, NE15 °~30 °,
NW330 °~350 ° of fold.Fold tectonic plays important control action to the accumulation of impact ground pressure energy amount in field with "nine squares".
Protolith energy is formed by ground by architectonic control, different type, different times in the coal mine field with "nine squares" of the ravine Mu Cheng
Texture makes the difference of the influence to protolith energy, and isomorphic different location coal and rock Energy distribution situation also has very big difference,
Analyze the ravine Mu Cheng coal mine mining area structure to protolith Energy distribution influence degree, extremely for following calculating field with "nine squares" energy range Energy distribution
It closes important.
Under the action of tectonic movement, a large amount of elasticity energy of the end accumulation of tomography provides dynamic for bump
Power condition.When disturbance of the region by mining work, the elasticity of the intracorporal stress of coal petrography and accumulation can sharply discharge, and break
Coal body is thrown to digging space, bump occurs by bad coal body under the action of energy expansion.The ravine Mu Cheng coal mine is occurred
Bump accident statistical analysis with showing 20 Secondary Shocks occurred at the ravine Mu Cheng coal mine nearly 5 years in pressure accident, Ji Huquan
Portion is located near Faults, or is influenced by tomography in field with "nine squares".
By analyzing above, the ravine Mu Cheng coal mine coal body by fold tectonic, rift structure, construction it is compound, joint, combination etc.
Architectonic control, Rock Burst mostly occur in geological structural belt.Be pressed in 3 Secondary Shocks ox road ditch to tiltedly nearby, 17
It is pressed in Secondary Shocks near northern port ditch reversed fault and french drain synsedimentary faults.
3.4 In The West Mountain Area of Beijing fault blocks divide
Geo-dynamic Division work should follow the principle from totality to part, by gradually reducing division range, analyze
The fault-block structure of field with "nine squares" scale or smaller range, establishes contacting between plate tectonice and protolith energy, and rock mass energy exists
Field dividing fault block figure is to be calculated under background, and therefore, analysis field with "nine squares" active fault is the basis for calculating protolith energy.
1. I grade of fault-block structure divides
I grade of fault-block structure is found out on the topographic map of ten thousand ratio of 1:250, I grade is broken totally 14.
2. II grade of fault-block structure divides
The II grade of fault-block structure found out on the topographic map of ten thousand ratio of 1:100, marks active fault altogether in survey region
40.
3. III grade of fault-block structure divides
On the topographic map of 1:20 ten thousand, centered on the coal mine of the ravine Mu Cheng, III grade of fault-block structure is found out, III grade marked off
Fracture shares 12.
4. IV grade of fault-block structure divides
The IV grade of fault-block structure found out on the topographic map of ten thousand ratio of 1:5, marks active fault 29 altogether in survey region
Item.
5. V grade of fault-block structure divides
The V grade of fault-block structure found out on the topographic map of ten thousand ratio of 1:1, marks active fault 21 altogether in survey region
Item.
Protolith energy Division under 4 natural conditions
The 4.1 field with "nine squares" crustal stress regularities of distribution
The right solution construction active procedure of the research of stress field has apparent importance.Protolith is estimated according to known fracture
Body Energy distribution.Had in terms of analyzing protolith energy based on the theories in geo-dynamical division method of plate tectonics significant representative.Area
Internal relation between domain construction and rock mass stress state is by theoretical or numerical analysis, inverting, is back-calculated and simulates to disclose
's.
The actual production specifications of actual area and underground occurred in conjunction with the ravine Mu Cheng coal mine stress abnormality.Finally
Determine that detecting earth stress region is scheduled on 3 slot country rock regions of the horizontal 2-4 crossdrift of+450m ,+450m level arranges altogether 3 now
Field test point.
For the ravine Mu Cheng coal mine carry out detecting earth stress, obtain 3 crustal stress gaging holes calculating maximum principal stress value, in
Between principal stress value, minimum principal stress value and the junction parameters such as azimuth and inclination angle.
The stress of primary rock is calculated and is divided under 4.2 natural conditions
(1) Roof rock feature analysis and division
By being analyzed and processed to the ravine Mu Cheng coal mine drilling data, three slot of the ravine Mu Cheng coal mine and two slot coals are finally obtained
The lithology distributions figure of layer top plate.
(2) computation model, grid dividing are established
The screen work that the ravine Mu Cheng coal mine region Recent Subsidence And Tectonic Movement is constructed by I~V grade of fault block figure, has selected V grade of fault block
Figure forms model.
(3) parameter definition
The parameter for needing to define mainly includes following several: crustal stress, rock mass and breaking mechanics parameter, rock mass mechanics ginseng
Number, fracture geometric parameter etc..Detecting earth stress result obtains above-mentioned parameter.Lithology distributions are determined according to field with "nine squares" borehole data.
4.3 energy densities calculate and energy range images outputting
According to gained stress data is calculated, inverse energy density values are shown energy density with isogram mode
Come.
4.4 protolith energy Divisions and its to bump impact analysis
According to bump transition energy density conditions and protolith energy occur for energy range division principle under the conditions of natural geology
Metric density, which compares, divides high-energy area, low energy area, more than the protolith energy density of bump transition energy density conditions
Region is high-energy area, and low energy area is known as by no bump energy density condition region smaller than protolith energy density
Low energy area.
(1) coal seam energy Division
On the basis of rock mass energy density calculates, coal mine three slot roof energy density in the ravine Mu Cheng is divided into height
Energy range, low energy area.Press to 20 Secondary Shocks 12 times in high-energy area, horizontal maximum principal stress value 27.5MPa~
31.5MPa, energy density values are 1.67 × 105J/m3~2.77 × 105J/m3, 1 time is 26 in horizontal maximum principal stress value
MPa, energy density values are 2.37 × 105J/m3, 1 time horizontal maximum principal stress value be 25MPa, energy density values be 2.39 ×
105J/m3, 1 time horizontal maximum principal stress value is 24MPa, energy density values are 2.43 × 105J/m3, 3 times horizontal maximum
Principal stress value is 23MPa, energy density values are 2.53 × 105J/m3。
Energy analysis is adopted under 5 mining conditions
Adopt energy density analysis in 5.1 protolith energy accumulation areas
5.1.1 the western five wall model foundations of three slots
For comprehensive system reflect the western five wall stopes of+250m three slot of a horizontal western crossdrift in exploitation process
Energy density distribution rule in front of working face and in coal column is utilized using geological conditions and Mining technology condition as background
The big numerical simulation software of FLAC3D establishes model, and model length is respectively 375m, 300m, 203m.
Computation model boundary condition is X-axis, Y-axis both ends boundary applies the constraint along X-axis, Y axis, X-direction, Y-axis position respectively
Shifting is all zero, is free boundary at the top of model, and bottom boundary is fixed.Computation model edge load condition is X-axis, Y-axis, Z axis side
To the gradient stress for applying 19.9MPa, 45.0MPa, 22.6MPa respectively.
5.1.2 western five walls of three slots adopt energy density analysis
Energy density distribution when three slots west, five wall working face extraction 30m is calculated, specifically obtains maximum energy-density,
Minimum energy density.Medium position energy density distribution curve etc. is moved towards along working face.Energy density peak is in the middle part of working face
5.48×105J/m3, belong to medium impact geostatic pressure degree, energy density peak is 5.3m away from working face wall distance.
5.2 coal and rock energy features and bump strength relationship
5.2.1 bump intensity is classified
(1) without bump risk
During working face mining, when the energy of coal body is less than the energy of coal body damage consumption, impact ground will not occur
Pressure, calculating the ravine Mu Cheng coal mine coal body failure loss energy according to coal body Damage Constitutive Model is 1.45 × 105J/m3, therefore, when
Coal body is under mining conditions, and energy density is less than 1.45 × 105J/m3, it is dangerous to be determined as no bump.
(2) weak bump risk defines value determination
Described according to the phenomenon that weak bump, coal or rock are dished out to mined out, but destructiveness be not it is very big, it is right
Bracket, machine and equipment there is no destruction；Country rock generates vibration, with the very big sound；Coal dust is generated, in gassy seam
In may have a large amount of Gas, the average initial velocity ν < 10m/s that broken coal body is dished out to free space.It is public by calculating
FormulaWhen the average initial velocity ν=10m/s that proper can be dished out, energy density is 2.41 × 105J/m3.Therefore,
When coal body is under mining conditions, energy density is 1.45 × 105J/m3~2.41 × 105J/m3Between when, be determined as weak impact
Ground pressure is dangerous.
(3) medium impact geostatic pressure degree defines value determination
The phenomenon that pressing according to medium impact describes, and part coal or rock are sharply crushed, and largely dishes out to mined out,
Average initial velocity ν >=10m/s that broken coal body is dished out to free space.
By the energy of bump system and the relational expression of earthquake magnitude, surface wave magnitude M can be determinedLWhen=2, bump
The scale radius R calculation formula of system:
Show that bump system scale radius is 1.83m, by microseism energy 108When J, calculated by formula 5.3
Obtain coal body energy density.The practical feelings of bump occurred below for the eastern wall of the ravine Mu Cheng coal mine three slot May in 2008
Condition, the calculation formula (5.2) according to bump system scale radius, wherein σ1=28.7MPa, σ2=23.1MPa, σ 3=
15.9MPa, E=1828MPa, μ=0.25, γ=40000KN/m3, H=500 show that bump system scale radius is
1.83m, by microseism energy 108When J, it is 1.3 × 10 that coal body energy density, which is calculated, by formula 5.36J/m3。
Therefore, when coal body is under mining conditions, energy density is 2.41 × 105J/m3~1.3 × 106J/m3Between when,
Press danger with being determined as medium impact.
R=1.83m
(4) thump geostatic pressure degree defines value determination
The phenomenon that pressing according to thump describes, and most of coal or rock are sharply crushed, and largely dishes out to mined out,
Appearance bracket is lost, equipment is mobile and country rock vibration, surface wave magnitude MLAt 2 grades or more, with the huge sound, a large amount of coals are formed
Dirt and generation shock wave, microseism energy is 108J or more.Therefore, when coal body is under mining conditions, energy density is greater than 1.3 ×
106When between J/m3, danger is pressed with being determined as thump.
Adopt Coal Under rock mass energy feature and bump strength relationship
Working face mining engineering activity causes country rock, overlying rock mechanical property and occurrence status variation, destroys certainly
Stress equilibrium under right state, causes stress state to redistribute, reaches new equilibrium state.Under natural geology dynamic condition
The energy effect of intercoupling is adopted caused by protolith energy and recovery activity, leads to the accumulation of energy, reaches and mine punching occurs
The energy condition pressed with hitting, to induce Rock Burst.
The current engineering activity in the ravine Mu Cheng field with "nine squares" has entered bump danger intensity area.Allow in geology and engineering
Under the conditions of, selection region, local danger releasing measures reduce degree of danger, it is therefore an objective to enable high-energy area coal and rock energy
Release reaches releasing or reduces degree of danger.While working face extraction, corresponding local detection method, a side are taken
Face is the degree of danger in order to reduce recovery activity region；On the other hand the validity to examine danger releasing measures.According to corresponding
Whether local testing result decides whether to continue exploitation engineering activity or continues to take bump danger releasing measures.At present
The danger releasing measures that the ravine Mu Cheng coal mine is taken have the measures such as drilling release, coal-bed flooding, relieving shot.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.Art technology
Personnel should be appreciated that invention scope involved in the application, however it is not limited to skill made of the specific combination of above-mentioned technical characteristic
Art scheme, while should also cover in the case where not departing from the inventive concept, by above-mentioned technical characteristic or its equivalent feature into
Row any combination and the other technical solutions formed.Such as features described above and (but being not limited to) disclosed herein have class
Technical characteristic like function is replaced mutually and the technical solution that is formed.
Claims (10)
1. a kind of classification method of bump strength grade, which comprises the following steps:
Coal body failure loss energy is obtained based on coal body Damage Constitutive Model, determines bump the first strength grade cut off value；
It is dished out energy based on the coal body failure loss energy and broken coal body first, determines the second strength grade of bump point
Dividing value；
The energy relationship of surface wave magnitude based on protolith coal body gross energy and setting determines that bump is equivalent to the setting
The third strength grade cut off value of surface wave magnitude.
2. the classification method of bump strength grade according to claim 1, which is characterized in that pass through corresponding energy
Density come express the corresponding coal body failure loss energy, broken coal body first is dished out energy and coal body protolith energy.
3. the classification method of bump strength grade according to claim 1, which is characterized in that the coal body damage is originally
The formula of structure model are as follows:
Y is damage power consumption rate；
σ is stress；
E is elasticity modulus；
D is damage variable, indicates unit volume micro-crack number；
DEFor the impairment value in the complete rupture failure of position E；
DDFor the impairment value in the complete rupture failure of position D；
UDEnergy is consumed for coal petrography bulk damage.
4. the classification method of bump strength grade according to claim 1, which is characterized in that the coal body damage is originally
Damage variable in structure model is determined by the stress-strain testing relationship of coal body in the mine.
5. the classification method of bump strength grade according to claim 1, which is characterized in that the broken coal body
One speed of dishing out for dishing out broken coal body corresponding to energy is 8-12m/s.
6. the classification method of bump strength grade according to claim 1, which is characterized in that the protolith coal body is total
Energy consideration Modern Tectonic Stress Field.
7. the classification method of bump strength grade according to claim 6, which is characterized in that the recent structure is answered
Protolith energy caused by the field of force includes weight stress energy and tectonic stress energy off field off field.
8. the classification method of bump strength grade according to claim 7, which is characterized in that weight stress off field can
Measure WZAre as follows:
In formula: E- elasticity modulus, GPa；
μ-cell cube Poisson's ratio；
γ-overlying rock volume-weighted average, KN/m3；
The depth of H- cell cube present position, m；
R- bump system scale radius, m；
Tectonic stress energy W off fieldGAre as follows:
In formula: k1The maximum principal stress factor of stress concentration；
k2The intermediate principal stress factor of stress concentration；
k3The minimum principal stress factor of stress concentration.
9. the classification method of bump strength grade according to claim 1, which is characterized in that based on the modern structure
The corresponding relationship for making protolith energy and the energy of the surface wave magnitude of the setting caused by stress field determines the bump
System scale radius；Energy and the bump system scale based on the protolith energy and/or the surface wave magnitude
Radius determines corresponding energy density as third strength grade cut off value.
10. a kind of prediction meanss of Rock Burst intensity, which is characterized in that described device includes:
Module is obtained, for obtaining coal body Damage Constitutive Model, broken coal body dishes out energy, protolith coal body gross energy and setting
The relevant parameter of surface wave magnitude；
Computing module is used for: being obtained coal body failure loss energy based on the coal body Damage Constitutive Model and is determined bump
One strength grade cut off value determines bump based on the coal body failure loss energy and broken coal body first energy of dishing out
Two strength grade cut off value determine impact based on the protolith coal body gross energy and the energy relationship of the surface wave magnitude of the setting
Ground pressure is equivalent to the third strength grade cut off value of the surface wave magnitude of the setting.
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