CN104074520B - A kind of shallow embedding closely adopts sky coal column incision eye method for determining position in side - Google Patents

A kind of shallow embedding closely adopts sky coal column incision eye method for determining position in side Download PDF

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CN104074520B
CN104074520B CN201410291453.4A CN201410291453A CN104074520B CN 104074520 B CN104074520 B CN 104074520B CN 201410291453 A CN201410291453 A CN 201410291453A CN 104074520 B CN104074520 B CN 104074520B
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coal
key stratum
column
disrumpent feelings
coal column
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CN201410291453.4A
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CN104074520A (en
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鞠金峰
许家林
朱卫兵
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中国矿业大学
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Abstract

The present invention proposes a kind of shallow embedding and closely adopt sky coal column incision eye method for determining position in side, first, collect and will arrange to cut and eye correspondence covers side and adopt boring column data near sky coal column; Secondly, according to the data collected, adopt Judging key stratum software specifically to hole the differentiation of key strata of covering rock position under column condition; Finally, deposit situation according to the tax of key stratum between upper and lower coal seam, carry out the determination of Qie Yan position, lower coal seam according to each self-corresponding method.The present invention repeats top board pressure rack diaster prevention and control practice when exploiting for contiguous seams in coal production process, has very high dependable with function.

Description

A kind of shallow embedding closely adopts sky coal column incision eye method for determining position in side
Technical field
The invention belongs to mining Technology Underground Coal Mine field, particularly relate to a kind of shallow embedding and closely adopt sky coal column incision eye method for determining position in side.
Background technology
In mining of closed distance coal seam group process, due to cut the section of eye more greatly, not easily supporting, usually can be arranged on when lower working face of coal seam is arranged seam mining leave over coal column district under; Thus, the stage of adopting at the beginning of work plane will experience the recovery process entered by Shang Fu coal column district under goaf, namely goes out the exploitation that sky coal column is adopted in side, as shown in Figure 3, and d in figure mcut on eye distance for lower coal seam and cover the distance that sky coal column border is adopted in side.On-the-spot mining Practice and observed result show, multiple work plane there occurs serious pressure rack phenomenon in the process, occur that the live instantaneous significantly lower contracting (more than 500mm) of post, support of support is crushed to death or to cause that coal-winning machine cannot pass through etc. violent presses phenomenon, brought great impact to the High-efficient Production of the safety of personnel and mine; And the shallow embedding contiguous seams such as this type of disaster Shen Dong, Yi Tai in NORTHWEST CHINA portion is composed to deposit in the recovery process in mining area and is seemed particularly general.How to guarantee that similar work plane covers safety when sky coal pillar mining is adopted in side on releasing, become the technical barrier that above-mentioned mining area is urgently to be resolved hurrily.
For above-mentioned pressure rack disaster, correlative study covers in conjunction with in the extraction of infrared ray light shine part mine the mining conditions that sky coal column is adopted in side, is studied from the angle of the disrumpent feelings motion of coal column top Critical layer the inherent mechanism that it occurs.Result shows, when work plane goes out coal column, coal column top Critical layer is disrumpent feelings block and side, goaf, coal column border fault blocks cannot form stable bearing structure all the time, and the excessive load that the gyration of this structure passes to rock stratum and support between coal seam is the basic reason causing pressure rack to occur.Therefore, how to ensure that coal column top Critical layer does not occur disrumpent feelings when going out coal column, or the load transmitted of its disrumpent feelings revolution unlikely cause rock stratum between coal seam cut, be the key of preventing and treating pressure rack.And lower coal seam is cut eye and covered upper the difference that position under sky coal column is adopted in side, by the size of the disrumpent feelings movement pattern and transmitted load thereof that directly have influence on coal column top Critical layer.So, rationally determine that the position that eye is cut in lower coal seam is the effective way solving above-mentioned pressure rack problem.
At present, field engineering technician to shallow embedding closely underlying seam cut eye arrange time, merely using the supporting whether being convenient to cut eye as according to designing, and fail to consider the extraction of follow-up work face is covered pressure rack control when sky coal column is adopted in side.Therefore, be necessary that design one is specifically designed to shallow embedding and closely adopts sky coal column incision eye method for determining position in side.
Summary of the invention
A kind of shallow embedding is the object of the present invention is to provide closely to adopt sky coal column incision eye method for determining position in side, be intended in conjunction with the concrete condition of coal seam occurrence of each mine and Strata Overlying The Seam lithologic structure feature, consider coal seam buried depth as a whole, whether there is key stratum, key strata of covering rock breaking span etc. between coal seam spacing, coal seam up and down, establish shallow embedding accordingly and closely adopt the computational methods of sky coal column incision eye position in side, instruct the research solving mine pressure rack problem and the safe working of shallow embedding contiguous seams, ensure mine safety production and personnel in the pit's safety.
The present invention is achieved in that a kind of shallow embedding closely adopts sky coal column incision eye method for determining position in side, comprises the following steps:
S1, collect and will arrange to cut and eye correspondence covers side and adopt boring column data near sky coal column;
S2, according to the data collected, Judging key stratum software is adopted specifically to hole the differentiation of key strata of covering rock position under column condition;
S3, deposit situation according to the tax of key stratum between upper and lower coal seam, carry out the determination of Qie Yan position, lower coal seam according to each self-corresponding method.
Preferably, in step sl, described boring column data is mine generaI investigation, detailed survey or scrutinize the surface drilling block diagram drilled through in process.
Preferably, in step s 2, described Judging key stratum software is KSPB, and national Copyright in Computer Software is numbered 2008SR34419.
Preferably, in step s3, cut a method for determining position described in and comprise following detailed process:
(1) up and down between coal seam without key stratum time
Cutting when eye is arranged to avoid coal column top Critical layer generation cantilevered disrumpent feelings, also should ensure to cut eye simultaneously and be in and cover outside coal column boundary stress peak value; Namely a position d is cut mshould meet such as formula the condition shown in (1):
D+Y<d m<l 1(1)
In formula, D is for cutting a width; l 1for the periodic failure step pitch of coal column top Critical layer, can determine according to the measured value of periodic weighting step pitch during upper seam mining; Y is coal column border Width of Plastic Zone, wherein, M 1, H is respectively coal column thickness and buried depth, C, be respectively cohesive strength and the angle of internal friction of coal body, γ is rock stratum unit weight, and K is the factor of stress concentration (general value 2 ~ 5), and f is the friction factor of coal seam and roof and floor contact surface, and ξ is triaxial stress coefficient,
(2) when there is 1 layer of key stratum up and down between coal seam
For the exploitation situation that there is 1 layer of key stratum between coal seam, its layout of cutting eye can more go deep into coal column inside, only need to ensure that the gyroscopic action of the disrumpent feelings block of coal column top Critical layer does not have an impact to force piece, mechanical model as shown in Figure 4 can be set up according to this.The determination of cutting a position can be carried out according to key stratum disrumpent feelings block revolution amount and these 2 aspects of the disrumpent feelings structural stability of key stratum.
Calculate by key stratum disrumpent feelings block revolution gauge: according to the analysis of pressure rack mechanism, the pressure rack of work plane is actual is the revolution amount Δ that upper bracket post alive absorbs the disrumpent feelings block G of coal column top Critical layer 1.Therefore, if when the revolution amount between coal seam during key stratum 2 first breaking can absorb the revolution amount of disrumpent feelings block G comparatively greatly, so the support of work plane can not be affected.So, the deflection Δ of the disrumpent feelings block of the corresponding key stratum 2 of coal column boundary bΔ should be met b>=Δ 1, wherein, Δ 2for the rotary space of the disrumpent feelings block of key stratum 2.And
&Delta; b = 2 ( L 2 - d m ) L 2 &Delta; 2 - - - ( 2 )
Can obtain by abbreviation thus:
d m≤(1-0.5Δ 12)L 2(3)
Wherein, Δ 1=M 1+ (1-K p1) ∑ h i1, Δ 2=M 2+ (1-K p2) ∑ h i2, M 2for lower mining thickness, ∑ h i1, K p1for upper coal seam immediate roof thickness and broken swollen coefficient thereof, ∑ h i2, K p2for lower coal seam immediate roof thickness and broken swollen coefficient thereof.
Calculate by the disrumpent feelings structural stability of key stratum: the effect covering load on namely should ensureing makes the unlikely generation sliding instability of key stratum 2 first breaking block articulated structure, namely should meet
F B ( l b - L 2 2 ) + L 2 2 8 q &prime; &le; R B &prime; &CenterDot; L 2 - l k 2 + R 0 L 2 2 - - - ( 4 )
In formula, F bfor passing to the load of key stratum 2 between coal seam in the disrumpent feelings turning course of coal column top Critical layer 1 cantilevered, wherein, i 1, α is respectively the disrumpent feelings block lumpiness of key stratum 1 and angle of revolution, i 1=h 1/ l 1, h 1for key stratum 1 thickness, q be key stratum 1 conduct oneself with dignity and on cover load, k bfor coefficient, k b=l b/ d m, l bfor F bthe moment of opposing left pin joint, l b=d m/ 2+L 2/ 4; L 2for the first breaking step pitch of key stratum 2, can according to the measured result value of contiguous work plane First Weighting Interval of Main; Q ' for key stratum 2 conduct oneself with dignity and and key stratum 1 between the load of rock stratum; R b' for force piece is by the support force of roof strata, R b'=R zj/ L-l kγ ∑ h i2, R zj, L, l kbe respectively the working resistance of force piece, support width and the support distance of face roof under control; R 0for the frictional force of block hinged place, t, be respectively the horizontal thrust between the disrumpent feelings sillar of key stratum 2 and friction factor, T=δ σ c/ 2, &delta; = h 2 2 [ 1 - tan ( &beta; 2 - &theta; 2 ) cot &beta; 2 ] - L 2 2 ( 1 - cos &theta; 2 ) tan ( &beta; 2 - &theta; 2 ) , Wherein, δ is the contact surface height of disrumpent feelings block hinged place, h 2for the thickness of key stratum 2, β 2, θ 2be respectively break corner (i.e. the angle of the plane of disruption and level rock) and the angle of revolution of the disrumpent feelings block of key stratum 2; σ cfor the uniaxial compressive strength of the disrumpent feelings block of key stratum 2.
During Practical Calculation, calculate by formula (3), formula (4) respectively, then get its higher value and rationally cut a position as final.
Certainly, if when there is the multilayer key stratum of more than 2 layers or 2 layers up and down between coal seam, similar Qie Yan position, lower coal seam exists 1 layer of key stratum really between rule and above-mentioned coal seam time, namely to make between coal seam the disrumpent feelings of one deck key stratum topmost meet formula (3) or formula (4).
The present invention overcomes the deficiencies in the prior art, a kind of shallow embedding is provided closely to adopt sky coal column incision eye method for determining position in side, according to Overlying Strata In A Face architectural feature under concrete mining conditions, by collecting the surface drilling column data that will differentiate work plane, first, each key position layer by layer in position of key stratum method of discrimination determination overlying strata is adopted; Secondly, according to the determination that whether there is key stratum between upper and lower coal seam and to carry out according to each self-corresponding method Qie Yan position, lower coal seam.If without key stratum between coal seam, the distance of cutting eye distance coal column border need be less than the periodic failure distance of coal column top Critical layer, and is in outside coal column boundary stress peak value; If when there is 1 layer or multilayer key stratum between coal seam, cut eye and can more go deep into coal column internal placement, only need to ensure that the frictional force of upper key stratum first breaking structure front end pin joint between coal seam and lower bracket resistance middle pin joint relative to the load that the revolution of coal column top Critical layer disrumpent feelings block is transmitted thereof reach equalising torque, or the revolution making this key stratum first breaking block reach the disrumpent feelings block of coal column top Critical layer at the deflection of coal column border correspondence position is measured.
The present invention not only considers to be covered side and adopts sky coal column boundary stress peak value to cutting eye driving and the impact of supporting, but also consider lower working face of coal seam in extraction, cover the impact that when sky coal column is adopted in side, the disrumpent feelings motion of coal column top Critical layer occurs Face Ground Pressure Behavior and pressure rack disaster, its reliability obtains the checking of engineering measurement.Under the present invention can adapt to different exploitation condition, the determination of cutting a position below sky coal column is adopted in side, and can be the safe and efficient production that shallow embedding contiguous seams repeats when exploiting and provide safeguard, its result of calculation is reliable, practical.
Accompanying drawing explanation
Fig. 1 is that in the embodiment of the present invention, shallow embedding closely adopts the flow chart of steps of sky coal column incision eye location determining method in side;
Fig. 2 is that shallow embedding of the present invention closely adopts sky coal column incision eye method for determining position in side;
Fig. 3 is that shallow embedding is closely descended in working face of coal seam extraction to cover the schematic diagram that sky coal pillar mining is adopted in side;
Fig. 4 is shallow embedding when closely there is up and down 1 layer of key stratum between coal seam, the mechanical model of this key stratum first breaking block structure;
Fig. 5 adopts K34 boring column and position of key stratum differentiation result near sky coal column to stone Ge platform colliery 12102 work plane covering side in actual application of the present invention;
Fig. 6 adopts K33 boring column and position of key stratum differentiation result near sky coal column to stone Ge platform colliery 12104 work plane covering side in actual application of the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
A kind of shallow embedding closely adopts sky coal column incision eye method for determining position in side, as depicted in figs. 1 and 2, comprises the following steps:
S1, collect and will arrange to cut and eye correspondence covers side and adopt boring column data near sky coal column;
In step sl, collected boring column data is mainly work plane periphery at mine generaI investigation, detailed survey or scrutinize the surface drilling block diagram drilled through in process.
S2, according to the data collected, Judging key stratum software is adopted specifically to hole the differentiation of key strata of covering rock position under column condition;
In step s 2, described Judging key stratum software is KSPB, and national Copyright in Computer Software is numbered 2008SR34419.When utilizing Judging key stratum software KSPB to differentiate key strata of covering rock position, need according to surface drilling full column input series of parameters, as: the thickness of rock stratum, modulus of elasticity, tensile strength, unit weight, rock stratum is disrumpent feelings angle and unconsolidated formation dynamic changes process coefficient.Wherein, rock parameter and depth of stratum can be obtained by mining area surface drilling block diagram; Unit weight, tensile strength, modulus of elasticity can carry out rock physical and mechanic parameter test by production standard rock sample and obtain.
S3, deposit situation according to the tax of key stratum between upper and lower coal seam, carry out the determination of Qie Yan position, lower coal seam according to each self-corresponding method.
In step s3, determine that lower coal seam is cut eye and adopted position below sky coal column in upper side of covering.If there is not key stratum between coal seam up and down, then cut the distance d on eye distance coal column border mthe periodic failure of coal column top Critical layer need be less than apart from l 1, and be in outside coal column boundary stress peak value, namely should meet the condition shown in formula (1).And if when there is up and down 1 layer or multilayer key stratum between coal seam, cut eye and more can go deep into coal column internal placement, only need the frictional force R ensureing upper key stratum first breaking structure front end pin joint between coal seam 0and lower bracket resistance R zjwith the load F that the disrumpent feelings block revolution of coal column top Critical layer is transmitted brelatively, pin joint reaches equalising torque, or makes this key stratum first breaking block at the deflection Δ of coal column border correspondence position breach the revolution amount Δ of the disrumpent feelings block of coal column top Critical layer 1, namely should meet the condition shown in formula (3) and formula (4).
In the actual application that the present invention arranges at Shi Getai colliery 12102 working face open-off cut eye, be illustrated in figure 5 and cover the position of key stratum differentiation result that K34 boring column near sky coal column is adopted in side, result is differentiated, residing for 12102 work planes 1 as can be seen from the position of key stratum of column -2coal with on cover 1 on-2exist without key stratum between coal, therefore, the determination of cutting a position should be carried out according to formula (1).On cover 1 on-2coal thickness M 1=2.18m, buried depth H=58.08m, stress concentration factor K=4, the cohesion C=1.5Mpa of coal body, angle of internal friction the friction factor f=0.25 of coal seam and roof and floor contact surface, then can calculate and cover 1 on-2sky coal column border Width of Plastic Zone Y=0.4m is adopted in coal side.Because cutting a width D=7.5m, above cover 1 on-2period from practical measurement water component during coal mining is l 1therefore, the reasonable Arrangement position of cutting eye should be 7.9<d to=9 ~ 13m m< (9 ~ 13).
Or, in the actual application that the present invention arranges at Shi Getai colliery 12104 working face open-off cut eye, be illustrated in figure 6 and cover the position of key stratum differentiation result that K33 boring column near sky coal column is adopted in side, differentiate result, residing for 12104 work planes 1 as can be seen from the position of key stratum of column -2coal with on cover 1 on-2only there is 1 layer of key stratum between coal, therefore, the determination of cutting a position should be carried out according to formula (3) or formula (4).First according to formula (3), on known by K33 boring column, 1 is covered on-2coal thickness M 1=2m, bottom 1-2 coal thickness M 2=2.08m, upper and lower coal seam immediate roof thickness ∑ h i1, ∑ h i2be respectively 4.49m and 7.49m, get the broken swollen COEFFICIENT K of upper and lower coal seam immediate roof p1=K p2=1.2, then can calculate Δ 1=1.102m, Δ 2=0.582m; Because of Δ 1> Δ 2, revolution amount when not meeting key stratum first breaking between coal seam can absorb the requirement of disrumpent feelings block revolution amount above coal column, therefore, cannot calculate according to formula (3), can only calculate according to formula (4).
L is got according to 12104 work planes contiguous work plane First Weighting Interval of Main measured value 2=43.0m, coal column top Critical layer breaking length gets l by upper seam mining period from practical measurement water component 1=13m, the lumpiness i of disrumpent feelings block 1=0.671, α=8 °, angle of revolution, key stratum 1 conduct oneself with dignity and on cover load and can obtain q=0.319MPa according to K33 column of holing, between coal seam key stratum deadweight and and coal column top Critical layer between the load q '=0.322MPa of rock stratum, by the working resistance R of work plane support used zj=8824kN, distance of face roof under control l k=5.5m, support width L=1.75m, rock unit weight γ=25kN/m 3, the uniaxial compressive strength σ of key stratum between coal seam c=39.9MPa, β 2, α 2distinguish value 85 ° and 8 °, get 0.3.The reasonable Arrangement position of cutting eye can be calculated according to formula (4) thus and should be d m≤ 35.7m.
In embodiments of the present invention, not only consider and cover side and adopt sky coal column boundary stress peak value to cutting eye driving and the impact of supporting, but also consider lower working face of coal seam in extraction, cover the impact that when sky coal column is adopted in side, the disrumpent feelings motion of coal column top Critical layer occurs Face Ground Pressure Behavior and pressure rack disaster, its reliability obtains the checking of engineering measurement.Under the present invention can adapt to different exploitation condition, the determination of cutting a position below sky coal column is adopted in side, and can be the safe and efficient production that shallow embedding contiguous seams repeats when exploiting and provide safeguard, its result of calculation is reliable, practical.
Compared to the shortcoming and defect of prior art, the present invention has following beneficial effect:
(1) not only consider and cover side and adopt sky coal column boundary stress peak value to cutting eye driving and the impact of supporting, but also consider lower working face of coal seam in extraction, cover the impact that when sky coal column is adopted in side, the disrumpent feelings motion of coal column top Critical layer occurs Face Ground Pressure Behavior and pressure rack disaster, its reliability obtains the checking of engineering measurement.
(2) under the present invention can adapt to different exploitation condition, the determination of cutting a position below sky coal column is adopted in side, and can be the safe and efficient production that shallow embedding contiguous seams repeats when exploiting and provide safeguard, its result of calculation is reliable, practical.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. shallow embedding closely adopts a sky coal column incision eye method for determining position in side, it is characterized in that comprising the following steps:
S1, collect and will arrange to cut and eye correspondence covers side and adopt boring column data near sky coal column;
S2, according to the data collected, Judging key stratum software is adopted specifically to hole the differentiation of key strata of covering rock position under column condition;
S3, deposit situation according to the tax of key stratum between upper and lower coal seam, carry out the determination of Qie Yan position, lower coal seam according to each self-corresponding method; If without key stratum between upper and lower coal seam, then the distance of cutting eye distance coal column border need be less than the periodic failure distance of coal column top Critical layer, and is in outside coal column boundary stress peak value; If when there is 1 layer or multilayer key stratum between coal seam, cut eye and can more go deep into coal column internal placement, only need to ensure that the frictional force of upper key stratum first breaking structure front end pin joint between coal seam and lower bracket resistance middle pin joint relative to the load that the revolution of coal column top Critical layer disrumpent feelings block is transmitted thereof reach equalising torque, or the revolution making this key stratum first breaking block reach the disrumpent feelings block of coal column top Critical layer at the deflection of coal column border correspondence position is measured;
Described defining method comprises further:
(1) up and down between coal seam without key stratum time
Cutting when eye is arranged to avoid coal column top Critical layer generation cantilevered disrumpent feelings, also should ensure to cut eye simultaneously and be in and cover outside coal column boundary stress peak value; Namely a position d is cut mshould meet such as formula the condition shown in (1):
D+Y<d m<l 1(1)
In formula, D is for cutting a width; l 1for the periodic failure step pitch of coal column top Critical layer, can determine according to the measured value of periodic weighting step pitch during upper seam mining; Y is coal column border Width of Plastic Zone, wherein, M 1, H is respectively coal column thickness and buried depth, C, be respectively cohesive strength and the angle of internal friction of coal body, γ is rock stratum unit weight, and K is the factor of stress concentration, and f is the friction factor of coal seam and roof and floor contact surface, and ξ is triaxial stress coefficient,
(2) when there is 1 layer of key stratum up and down between coal seam
For the exploitation situation that there is 1 layer of key stratum between coal seam, its layout of cutting eye can more go deep into coal column inside, only needs to ensure that the gyroscopic action of the disrumpent feelings block of coal column top Critical layer does not have an impact to force piece;
Calculate by key stratum disrumpent feelings block revolution gauge: according to the analysis of pressure rack mechanism, the pressure rack of work plane is actual is the revolution amount Δ that upper bracket post alive absorbs the disrumpent feelings block G of coal column top Critical layer 1; Therefore, if when the revolution amount between coal seam during key stratum 2 first breaking can absorb the revolution amount of disrumpent feelings block G comparatively greatly, so the support of work plane can not be affected; So, the deflection Δ of the disrumpent feelings block of the corresponding key stratum 2 of coal column boundary bΔ should be met b>=Δ 1, wherein, Δ 2for the rotary space of the disrumpent feelings block of key stratum 2; And
&Delta; b = 2 ( L 2 - d m ) L 2 &Delta; 2 - - - ( 2 )
Can obtain by abbreviation thus:
d m≤(1-0.5Δ 12)L 2(3)
Wherein, Δ 1=M 1+ (1-K p1) ∑ h i1, Δ 2=M 2+ (1-K p2) ∑ h i2, M 2for lower mining thickness, ∑ h i1, K p1for upper coal seam immediate roof thickness and broken swollen coefficient thereof, ∑ h i2, K p2for lower coal seam immediate roof thickness and broken swollen coefficient thereof;
Calculate by the disrumpent feelings structural stability of key stratum: the effect covering load on namely should ensureing makes the unlikely generation sliding instability of key stratum 2 first breaking block articulated structure, namely should meet
F B ( l b - L 2 2 ) + L 2 2 8 q &prime; &le; R B &prime; &CenterDot; L 2 - l k 2 + R 0 L 2 2 - - - ( 4 )
In formula, F bfor passing to the load of key stratum 2 between coal seam in the disrumpent feelings turning course of coal column top Critical layer 1 cantilevered, wherein, i 1, α is respectively the disrumpent feelings block lumpiness of key stratum 1 and angle of revolution, i 1=h 1/ l 1, h 1for key stratum 1 thickness, q be key stratum 1 conduct oneself with dignity and on cover load, k bfor coefficient, k b=l b/ d m, l bfor F bthe moment of opposing left pin joint, l b=d m/ 2+L 2/ 4; L 2for the first breaking step pitch of key stratum 2, can according to the measured result value of contiguous work plane First Weighting Interval of Main; Q ' for key stratum 2 conduct oneself with dignity and and key stratum 1 between the load of rock stratum; R b' for force piece is by the support force of roof strata, R b'=R zj/ L-l k γ∑ h i2, R zj, L, l kbe respectively the working resistance of force piece, support width and the support distance of face roof under control; R 0for the frictional force of block hinged place, t, be respectively the horizontal thrust between the disrumpent feelings sillar of key stratum 2 and friction factor, T=δ σ c/ 2, &delta; = h 2 2 &lsqb; 1 - t a n ( &beta; 2 - &theta; 2 ) cot&beta; 2 &rsqb; - L 2 2 ( 1 - cos&theta; 2 ) t a n ( &beta; 2 - &theta; 2 ) , Wherein, δ is the contact surface height of disrumpent feelings block hinged place, h 2for the thickness of key stratum 2, β 2, θ 2be respectively break corner and the angle of revolution of the disrumpent feelings block of key stratum 2; σ cfor the uniaxial compressive strength of the disrumpent feelings block of key stratum 2;
During Practical Calculation, calculate by formula (3), formula (4) respectively, then get its higher value and rationally cut a position as final;
Certainly, if when there is the multilayer key stratum of more than 2 layers or 2 layers up and down between coal seam, similar Qie Yan position, lower coal seam exists 1 layer of key stratum really between rule and above-mentioned coal seam time, namely to make between coal seam the disrumpent feelings of one deck key stratum topmost meet formula (3) or formula (4).
2. shallow embedding as claimed in claim 1 closely adopts sky coal column incision eye method for determining position in side, it is characterized in that, in step sl, described boring column data is for mine generaI investigation, detailed survey or scrutinize the surface drilling block diagram drilled through in process.
3. shallow embedding as claimed in claim 1 closely adopts sky coal column incision eye method for determining position in side, and it is characterized in that, in step s 2, described Judging key stratum software is KSPB, and national Copyright in Computer Software is numbered 2008SR34419.
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