CN108664698B - A kind of dynamic disturbance adds the residual exploiting field Upward mining feasibility determination method of tool post of unloading - Google Patents
A kind of dynamic disturbance adds the residual exploiting field Upward mining feasibility determination method of tool post of unloading Download PDFInfo
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Abstract
The invention discloses the residual exploiting field Upward mining feasibility determination methods of tool post of a kind of dynamic disturbance plus unloading, belong to technical field of coal exploitation.The residual exploiting field of tool post is found out first and leaves the distributing position in coal seam, obtains rock stratum composition, structure and the physical and mechanical parameter situation of interlayer rock stratum, and to interlayer rock stratum universal formulation and number from the bottom to top；Then the position for determining control rock stratum calculates separately support pressure and leaves coal column by acting on the residual exploiting field of tool post after propagation attenuation and control the disturbing load size on rock stratum；Finally consider the effect of dynamic disturbance plus unloading, the analysis residual exploiting field of tool post leaves coal column and controls the stability of rock stratum, obtains the feasible sex determination result of the residual exploiting field Upward mining of tool post.The situation that the present invention avoids empirical approach error larger provides theoretical foundation for the residual coal safe working of the residual exploiting field uplink of tool post, improves the rate of recovery of the residual exploiting field top coal resources of tool post, effectively extends the length of service of mine.
Description
Technical field
The invention belongs to technical field of coal exploitation, and in particular to it is a kind of it is dynamic disturbance plus unloading the residual exploiting field uplink of tool post open
Adopt feasibility determination method.
Background technique
With the increase of coal mining intensity, many preferable coal resources of mining area exploitation condition are gradually decreased.Residual exploiting field
The reserves that coal seam is left on top are considerable, have good extraction value, and safe working problem is increasingly prominent.
The determination method of existing residual exploiting field Upward mining mainly uses for reference the method for discrimination for being caving uplink order mining, i.e. ratio
Diagnostic method, " three bands " diagnostic method and country rock balancing method.These determination methods are substantially around interlamellar spacing and adopt thick progress, main
It has the following problems:
(1) above method is not suitable for the judgement of the residual exploiting field Upward mining of tool post, and only rests on qualitative experience level,
It is not able to satisfy the requirement of production practices；
(2) coal column and layer are not all left in the residual exploiting field of tool post by the residual exploiting field Upward mining feasibility determination method of existing tool post
Between rock stratum as system carry out stability study, and do not provide the quantitative judgement formula of stability；
(3) existing determination method does not account for top and leaves the disturbing load generated when seam mining to tool post residual exploiting field something lost
Stay the effect of coal column and interlayer rock stratum system, and disturbing load be an important factor for causing coal column and interlayer rock stratum system unstability it
One.
In addition, it is loose, broken, unstable with rock stratum that roof is left on the residual exploiting field top having in existing mine
The characteristics of, its top plate is with adopting with falling and be compacted the residual exploiting field almost restored to the stress of primary rock, and had again when leaving seam mining
Roof Rock Strata of Coal Seam is left in based on hard, competent bed in top, its top plate is not easy across falling when leaving seam mining, and different is residual
Exploiting field have the characteristics that it is different, exploitation difficulty must not make sweeping generalizations；Moreover, control rock stratum on disturbing load active width with
The relationship of the hanging span in interlayer rock stratum between two layers of coal also affects the safety of coal mining.Therefore, it is badly in need of proposing one kind
With more the residual exploiting field Upward mining feasibility determination method of tool post of safety and practical application.
Summary of the invention
The present invention overcomes the shortcomings of the prior art, in order to avoid the situation that empirical method error is larger, fully considers
The effect of coal column and interlayer rock stratum system, technical problem to be solved are left to the residual exploiting field of tool post in dynamic disturbance plus unloading are as follows:
A kind of residual exploiting field Upward mining feasibility determination method of tool post suitable for dynamic disturbance plus unloading is provided, to improve mining feasibility
The accuracy of judgement.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows: a kind of dynamic tool post for disturbing plus unloading is residual
Exploiting field Upward mining feasibility determination method, comprising the following steps:
S1, according to mine shaft geology data and exploitation data, find out and the residual exploiting field of tool post and leave the distributing position in coal seam, draw
It the residual exploiting field of tool post and leaves coal seam distributional pattern figure, and determines that mine operating condition belongs to dynamic disturbance plus unloading type；
S2, rock stratum composition, structure and the physical and mechanical parameter situation for determining interlayer rock stratum, and from the bottom to top to interlayer rock stratum
Universal formulation and number；
S3, according to the thickness h of pressure observation data and rock stratum composition, strata structure and the i-th rock stratumi, bulk density γi, springform
Measure Ei, determine the position of control rock stratum；
S4, the support pressure that generates when leaving seam mining is calculated separately to act on tool post after transmitting decaying residual
Leave the disturbing load on coal column in exploiting fieldWith the disturbing load acted on control rock stratum
S5, pass through formulaCalculating is set out to disturb
Dynamic plus unloading acts on the lower residual exploiting field of tool post and leaves vertical stress maximum value σ suffered by coal columnM, max, wherein qm1It indicates because tool post is residual
The uniform load of the self weight of exploiting field overlying rock and formation；qm2Indicate the uniform load reformed certainly by interlayer rock stratum；lxExpression layer
Between the hanging span in rock stratum；bmIndicate that coal pillar width is left in the residual exploiting field of tool post；l1Indicate disturbing loadActive width；Then it uses
Servo-pressing machine measures the vertical critical slope langth compression stress ot of the coal column of scaled downm,c, compare σm,maxWith σm,cNumerical value it is big
It is small, if σm,max≥σm,c, then coal column unstability, determines that the residual exploiting field top of tool post is left coal seam and can not be adopted；If σm,max< σm,c, then coal
Column is stablized, and step S6 is continued；
S6, pass through formulaDisturbance plus unloading are set out in calculating
Maximum tension stress σ suffered by effect lower control rock stratumk,maxValue, wherein qk1It indicates to be formed because controlling the self weight of rock stratum overlying rock
Uniform load, including control rock stratum self weight；qk2Indicate the equivalent load that interlayer rock stratum acts on control rock stratum, including control
Rock stratum self weight；l2Indicate disturbing loadActive width；K indicates the number of control rock stratum, and n indicates the number of plies of interlayer rock stratum,It indicates from control rock stratum to the height for leaving coal seam；Then control rock stratum tensile strength sigma is determinedk,tValue, compare σk,max
With σk,tNumerical values recited, if σk,max≥σk,t, then rock stratum unstability is controlled, determines that the residual exploiting field top of tool post is left coal seam and can not be adopted；
If σk,max< σk,t, then control rock stratum and keep stablizing, be judged to adopt.
In the step S2, rock stratum composition, structure that interlayer rock stratum is obtained with the method for boring and coring are pried through by drilling
And physical and mechanical parameter situation.
In the step S3, the judgement formula of rock stratum is controlled are as follows:
The kth rock stratum for meeting above formula is to control rock stratum, in formula, k=j+1；K, j indicates rock stratum number.
In the step S4, the support pressure generated when leaving seam mining is acting on tool post after transmitting decaying
Leave the disturbing load on coal column in residual exploiting fieldWith the disturbing load acted on control rock stratumCalculation formula are as follows:
In formula, γ indicates to leave the volume-weighted average of Strata Overlying The Seam；H indicates to leave the thickness of Strata Overlying The Seam；x0
The length of seam mining work rock pressure is left in expression；l0The width of seam mining work rock pressure is left in expression；ki
Indicate load concentration factor；zmIndicate that disturbing load is transmitted to the depth for leaving coal column；zkIndicate that disturbing load is transmitted to control rock
The depth of layer.
Compared with the prior art, the invention has the following beneficial effects:
(1) determination method provided by the invention suitable for the residual exploiting field Upward mining of tool post, fully considers that coal is left on top
The disturbing load generated when layer exploitation leaves the effect of coal column and interlayer rock stratum system to the residual exploiting field of tool post, and it is feasible to give exploitation
Property quantitative judgement formula, and effectively avoid the decision errors of empirical approach, improve the accuracy of mining feasibility judgement；
(2) rate of recovery of the residual exploiting field top coal resources of tool post can be improved in practical application of the invention, economizes on resources, has
Effect extends the length of service of mine.
Detailed description of the invention
Fig. 1 is the residual exploiting field of tool post and the distributional pattern figure for leaving coal seam；
Fig. 2 is the residual exploiting field Upward mining feasibility determination method of tool post of a kind of dynamic disturbance plus unloading proposed by the present invention
Flow chart；
Fig. 3 is that dynamic disturbance plus unloading act on the lower residual exploiting field of tool post and leave the most easy unstability state model figure of coal column；
Fig. 4 is that dynamic disturbance adds unloading effect is lower to control the most easy unstability state model figure in rock stratum；
Fig. 5 is certain coal mine distribution of strata aspect graph used in the embodiment of the present invention；
In figure: leaving coal column in the residual exploiting field of A-tool post；B-tool post goaf；C-leaves coal seam；D-interlayer rock stratum；E—
Leave Strata Overlying The Seam and topsoil.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described, it is clear that described embodiment is a part of the embodiments of the present invention, without
It is whole embodiments；Based on the embodiments of the present invention, those of ordinary skill in the art are not before making creative work
Every other embodiment obtained is put, shall fall within the protection scope of the present invention.
As shown in Figure 1, for the residual exploiting field of tool post and the distributional pattern figure for leaving coal seam, wherein A indicates that the residual exploiting field of tool post is left
Coal column；B indicates tool post goaf；Coal seam is left in C expression；D indicates interlayer rock stratum；Strata Overlying The Seam and surface soil are left in E expression
Layer.
The present invention provides the residual exploiting field Upward mining feasibility determination methods of tool post of a kind of dynamic disturbance plus unloading, are applicable in
In the mine operating condition of dynamic disturbance plus unloading.Its qualifications are as follows: leave Roof Rock Strata of Coal Seam and based on hard, competent bed, lost in
Its top plate is not easy across falling when staying seam mining；The disturbing load active width controlled on rock stratum is less than the hanging span in interlayer rock stratum,
The movement of disturbing load has an impact to the judgement result of control rock stratum stability.In addition, determination method of the invention is only applicable to
Mine coal seam is the mine of flat seam.
As shown in Fig. 2, dynamic disturbance of the invention adds the residual exploiting field Upward mining feasibility determination method of the tool post of unloading specific
Step includes:
S1, according to mine shaft geology data and exploitation data, find out and the residual exploiting field of tool post and leave the distributing position in coal seam, draw
It the residual exploiting field of tool post as shown in Figure 1 and leaves coal seam distributional pattern figure, and determines that mine operating condition belongs to dynamic disturbance plus unloading type,
Roof Rock Strata of Coal Seam is left in based on hard, competent bed, its top plate is not easy across falling when leaving seam mining, and controls rock
Disturbing load active width on layer is less than the hanging span in interlayer rock stratum.
S2, the method with boring and coring is pried through by drilling, determines rock stratum composition, structure and the physical mechanics of interlayer rock stratum
Parameter situation, and to interlayer rock stratum universal formulation and number from the bottom to top.
S3, according to the thickness h of pressure observation data and rock stratum composition, strata structure and the i-th rock stratumi, bulk density γi, springform
Measure Ei, determine the position of control rock stratum.
Wherein, the judgement formula of rock stratum is controlled are as follows:
The kth rock stratum for meeting above formula (1) is to control rock stratum, in formula, k=j+1；K, j indicates rock stratum number.
S4, the support pressure that generates when leaving seam mining is calculated separately to act on tool post after transmitting decaying residual
Leave the disturbing load on coal column in exploiting fieldValue and act on control rock stratum on disturbing loadValue；Wherein, disturbance carries
The calculation formula of lotus are as follows:
In formula (2), γ indicates to leave the volume-weighted average of Strata Overlying The Seam；H indicates to leave the thickness of Strata Overlying The Seam；
x0The length of seam mining work rock pressure is left in expression；l0The width of seam mining work rock pressure is left in expression；
kiIndicate load concentration factor；Z indicates the depth of disturbing load transmitting.Coal column z corresponding with control rock stratum will be left and substitute into formula
(2), then it can calculate separately to obtainWithValue.That is, support pressure is acting on knife after transmitting decaying
Leave the disturbing load on coal column in the residual exploiting field of columnWith the disturbing load acted on control rock stratumExpression formula be respectively as follows:
Wherein, zmIndicate that disturbing load is transmitted to the depth for leaving coal column, zkIndicate that disturbing load is transmitted to control rock stratum
Depth.
S5, the stability for acting on lower coal column to dynamic disturbance plus unloading are analyzed.It calculates first and sets out disturbance plus unloading work
Vertical stress maximum value σ suffered by coal column is left with the residual exploiting field of lower tool postM, max, then scaled down is measured with servo-pressing machine
Coal column vertical critical slope langth compression stress otm,c, compare σm,maxWith σm,cNumerical values recited, if σm,max≥σm,c, then coal column loses
Surely, determine that the residual exploiting field top of tool post is left coal seam and can not be adopted；If σm,max< σm,c, then coal column is stablized, and continues step S6.
Vertical stress maximum value σ suffered by coal column is left in order to determine that dynamic disturbance plus unloading act on the lower residual exploiting field of tool postM, max
Calculation formula, coal column is left into the residual exploiting field of tool post and is reduced to fixed-hinged support, the interlayer rock stratum between two layers of coal is reduced to
Beam, obtains dynamic disturbance plus unloading acts on the simplified mechanical model that the most easy instability status of coal column is left in the lower residual exploiting field of tool post, such as Fig. 3 institute
Show.In model, qm1Indicate the uniform load formed by the residual exploiting field overlying rock self weight of tool post；qm2It indicates because of interlayer rock stratum certainly
The uniform load of reformation；lxIndicate the hanging span in interlayer rock stratum；bmIndicate that coal pillar width is left in the residual exploiting field of tool post；It indicates to lose
The support pressure generated when staying seam mining leaves disturbance on coal column acting on the residual exploiting field of tool post after transmitting decaying
Load；l1Indicate disturbing loadActive width.The vertical pressure that support 2 (coal column) is born in model is maximum, with support 2
Model is divided into left and right two parts for boundary, if the pressure that support 2 is born in left-half is Fm1, according to torque equilibrium equation
(∑M2(F)=0 it), can obtain:
It can be obtained by formula (3),Similarly, if support 2 exists
The pressure born in right half part is Fm2,Finally, support
2 vertical pressures born are as follows: FM, max=Fm2+Fm1, it is known that the width b of coal columnm, byDerive σM, max's
Calculation formula are as follows:
S6, the stability of dynamic disturbance plus unloading effect lower control rock stratum is analyzed.It calculates first and sets out disturbance plus unload
Maximum tension stress σ suffered by load effect lower control rock stratumk,maxValue, then determine control rock stratum tensile strength sigmak,tValue, wherein
Control rock stratum tensile strength sigmak,tValue can by being measured with Brazilian diametral compression test, can also from mine data directly
It searches；Finally compare σk,maxWith σk,tNumerical values recited, if σk,max≥σk,t, then rock stratum unstability is controlled, is determined on the residual exploiting field of tool post
It leaves coal seam and can not adopt in portion；If σk,max< σk,t, then control rock stratum and keep stablizing, be judged to adopt.
In order to determine maximum tension stress σ suffered by dynamic disturbance plus unloading effect lower control rock stratumk,maxCalculation formula, will leave
The composite structure of coal column and interlayer rock stratum is reduced to simple beam structure, and under dynamic disturbance plus unloading effect, disturbing load is moved to
When simply supported beam span centre, the most easy unstability of simply supported beam obtains the simplified mechanical model of the control most easy instability status in rock stratum, as shown in Figure 4.
In model, qk1Indicate the uniform load formed because controlling the self weight of rock stratum overlying rock, including the self weight of control rock stratum；qk2It indicates
Interlayer rock stratum acts on the equivalent load on control rock stratum, including the self weight of control rock stratum；Generation when seam mining is left in expression
Support pressure by transmitting decaying after acting on control rock stratum on disturbing load；l2Indicate disturbing loadEffect
Width,It indicates from control rock stratum to the height for leaving coal seam.According to torque equilibrium equation (Σ M1(F)=0 it), can find out
The end reaction of support 1 isIt is maximum to control moment of flexure at the span centre of rock stratum, thus it is maximum
Moment of flexureFor a height ofWidth is the square of unit width
Tee section, bending resistant section coefficientThen according to the calculation formula of Beam in Transverse Bending section maximum (normal) stress:It can derive and set out maximum tension stress σ suffered by disturbance plus unloading effect lower control rock stratumk,maxCalculating it is public
Formula are as follows:
Below by taking certain coal mine as an example, illustrate a specific embodiment of the invention.
Certain coal mine passes through nearly 30 years high tension coal minings, and Coal Resources in Mine is reduced rapidly, and mining area Main workable coal seams are 2
Number, No. 3 coal seams, belong to flat seam.No. 2, No. 3 Roof Rock Strata of Coal Seam based on hard, competent bed, be not easy inbreak in.
Due to history, artificially with technology etc., which spans No. 2 coal seams and has exploited No. 3 coal seams using tool post method.The coal mine is being opened
After having adopted No. 3 coal seams, No. 2 coal seams also great extraction value is found.Year is used in order to improve Business Economic Benefit, extend mine
Limit, the mine draft experiment exploit No. 2 coal seams covered on No. 3 residual exploiting fields of coal seam tool post, and the feasible sex determination of exploitation is particularly important.Needle
To above situation, specific implementation step is as follows:
1, by the original geologic information of the coal mine and exploitation data the study found that being lost in No. 3 residual exploiting fields of coal seam tool post
Staying coal column mean breadth is 15m, average height 3.2m, and stability is preferable；Goaf mean breadth is 30m, and average height is
3.2m.No. 2, No. 3 coal seam interlayer depth of stratum be 19.3m, draw the residual exploiting field of tool post and leave coal seam distributional pattern figure, such as attached drawing
Shown in 5.No. 3 Roof Rock Strata of Coal Seam are in based on hard, competent bed, its top plate is not easy across falling when leaving seam mining；Control rock
Disturbing load active width l on layer2=20m, the hanging span l in interlayer rock stratumx=30m, l2<lx, then it is dynamic to confirm that the operating condition belongs to
Disturbance plus unloading type.
2, rock stratum composition, structure and the physics that the coal mine interlayer rock stratum is obtained with the method for boring and coring are pried through using drilling
Mechanics parameter situation, and to interlayer rock stratum universal formulation and number from the bottom to top, as shown in figure 5, from top to bottom by interlayer rock stratum
Number consecutively is 1~6.
3, the composition of the rock stratum according to obtained in pressure observation data and step 2, structure and the thickness h of the i-th rock stratumi, bulk density
γi, elastic modulus EiEqual physical and mechanical parameters situation.Control rock stratum is obtained using the judgement formula of control rock stratum in conjunction with Fig. 5
Position, specific calculating are as follows:
···
It is calculated, as k=4, meets formula (1), i.e., the 4th layer is control rock stratum.
4, known parameters are substituted into formula (2), calculates separately support pressure residual by acting on tool post after propagation attenuation
Leave the disturbing load on coal column in exploiting fieldWith the disturbing load acted on control rock stratumIt is big that disturbing load is calculated
It is small to be respectivelyWith
5, according to existing operating condition, consider the effect of dynamic disturbance plus unloading.Known by step 4It substitutes into public
Formula:Dynamic disturbance plus unloading effect is calculated
Leave vertical stress maximum value σ suffered by coal column in the lower residual exploiting field of tool postM, max=2.2MPa, meanwhile, measurement obtains the vertical of coal column
Critical slope langth compression stress otm,c=9.3MPa.σm,max< σm,c, then coal column is stablized, and continues step 6.
6, it will act on the disturbing load value on control rock stratumSubstitute into formulaIt is calculated under dynamic disturbance plus unloading effect and controls rock stratum institute
By maximum tension stress σk,max=8.2MPa, actually measured control rock stratum tensile strength sigmak,t=2.8Mpa, σk,max> σk,t, then control
Rock stratum unstability processed is judged to adopt.
In conclusion under dynamic disturbance plus unloading effect, although coal column guarantor is left in the residual exploiting field of tool post in No. 3 coal seams of coal mine
It is fixed to keep steady, but the interlayer rock stratum unstable failure between two coal seams.Therefore, No. 2 coal seams of the residual exploiting field Upward mining of the coal mine tool post are not
It is feasible.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (4)
1. the residual exploiting field Upward mining feasibility determination method of tool post of a kind of dynamic disturbance plus unloading, which is characterized in that including following
Step:
S1, according to mine shaft geology data and exploitation data, find out the residual exploiting field of tool post and leave the distributing position in coal seam, draw tool post
It residual exploiting field and leaves coal seam distributional pattern figure, and determines that mine operating condition belongs to dynamic disturbance plus unloading type；
S2, rock stratum composition, structure and the physical and mechanical parameter situation for determining interlayer rock stratum, and interlayer rock stratum is unified from the bottom to top
It divides and numbers；
S3, according to the thickness h of pressure observation data and rock stratum composition, strata structure and the i-th rock stratumi, bulk density γi, elasticity modulus
Ei, determine the position of control rock stratum；
S4, it calculates separately the support pressure that generates when leaving seam mining and is acting on the residual exploiting field of tool post after transmitting decaying
Leave the disturbing load on coal columnWith the disturbing load acted on control rock stratum
S5, pass through formulaCalculating is set out disturbance and is added
Unloading acts on the lower residual exploiting field of tool post and leaves vertical stress maximum value σ suffered by coal columnM, max, wherein qm1It indicates because of the residual exploiting field of tool post
The uniform load of overlying rock self weight and formation；qm2Indicate the uniform load reformed certainly by interlayer rock stratum；lxIndicate interlayer rock
The hanging span of layer；bmIndicate that coal pillar width is left in the residual exploiting field of tool post；l1Indicate disturbing loadActive width；Then servo is used
Press machine measures the vertical critical slope langth compression stress ot of the coal column of scaled downm,c, compare σm,maxWith σm,cNumerical values recited, if
σm,max≥σm,c, then coal column unstability, determines that the residual exploiting field top of tool post is left coal seam and can not be adopted；If σm,max< σm,c, then coal column is steady
It is fixed, continue step S6；
S6, pass through formulaCalculating is set out under disturbance plus unloading effect
Control maximum tension stress σ suffered by rock stratumk,maxValue, wherein qk1It indicates because controlling the self weight of rock stratum overlying rock due to being evenly distributed with for being formed
Load, including the self weight of control rock stratum；qk2Indicate the equivalent load that interlayer rock stratum acts on control rock stratum, including control rock stratum is certainly
Weight；l2Indicate disturbing loadActive width；K indicates the number of control rock stratum, and n indicates the number of plies of interlayer rock stratum,Table
Show from control rock stratum to the height for leaving coal seam；Then control rock stratum tensile strength sigma is determinedk,tValue, compare σk,maxWith σk,t's
Numerical values recited, if σk,max≥σk,t, then rock stratum unstability is controlled, determines that the residual exploiting field top of tool post is left coal seam and can not be adopted；If σk,max
< σk,t, then control rock stratum and keep stablizing, be judged to adopt.
2. the residual exploiting field Upward mining feasibility determination method of tool post of a kind of dynamic disturbance according to claim 1 plus unloading,
It is characterized in that, prying through the rock stratum composition, the knot that obtain interlayer rock stratum with the method for boring and coring by drilling in the step S2
Structure and physical and mechanical parameter situation.
3. the residual exploiting field Upward mining feasibility determination method of tool post of a kind of dynamic disturbance according to claim 1 plus unloading,
It is characterized in that, controlling the judgement formula of rock stratum in the step S3 are as follows:
The kth rock stratum for meeting above formula is to control rock stratum, in formula, k=j+1；K, j indicates rock stratum number.
4. the residual exploiting field Upward mining feasibility determination method of tool post of a kind of dynamic disturbance according to claim 1 plus unloading,
It is characterized in that, the support pressure generated when leaving seam mining is acted on after transmitting decaying in the step S4
Leave the disturbing load on coal column in the residual exploiting field of tool postWith the disturbing load acted on control rock stratumCalculation formula are as follows:
In formula, γ indicates to leave the volume-weighted average of Strata Overlying The Seam；H indicates to leave the thickness of Strata Overlying The Seam；x0It indicates to lose
Stay the length of seam mining work rock pressure；l0The width of seam mining work rock pressure is left in expression；kiIt indicates to carry
Lotus coefficient of concentration；zmIndicate that disturbing load is transmitted to the depth for leaving coal column；zkIndicate that disturbing load is transmitted to the depth of control rock stratum
Degree.
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