CN104074520A - Method for determining lower open-off cut positions of shallow-buried short-distance goaf-side coal pillars - Google Patents

Method for determining lower open-off cut positions of shallow-buried short-distance goaf-side coal pillars Download PDF

Info

Publication number
CN104074520A
CN104074520A CN201410291453.4A CN201410291453A CN104074520A CN 104074520 A CN104074520 A CN 104074520A CN 201410291453 A CN201410291453 A CN 201410291453A CN 104074520 A CN104074520 A CN 104074520A
Authority
CN
China
Prior art keywords
key stratum
coal
stratum
key
coal column
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201410291453.4A
Other languages
Chinese (zh)
Other versions
CN104074520B (en
Inventor
鞠金峰
许家林
朱卫兵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China University of Mining and Technology CUMT
Original Assignee
China University of Mining and Technology CUMT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China University of Mining and Technology CUMT filed Critical China University of Mining and Technology CUMT
Priority to CN201410291453.4A priority Critical patent/CN104074520B/en
Publication of CN104074520A publication Critical patent/CN104074520A/en
Application granted granted Critical
Publication of CN104074520B publication Critical patent/CN104074520B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention provides a method for determining lower open-off cut positions of shallow-buried short-distance goaf-side coal pillars. According to the method, firstly, drillhole column data near the overlying goaf-side coal pillars corresponding to open-off cuts to be arranged is collected; then, according to the collected data, key layer identifying software is adopted for identifying overlying strata key layer positions under the concrete drillhole column conditions; and finally, according to the occurrence conditions of the key layers between an upper coal bed and a lower coal bed, the lower coal bed open-off cut position determination is carried out according to respective corresponding methods. The method provided by the invention is used for roof plate press frame disaster prevention and control practice during the short-distance coal bed repeated exploitation in a coal mine production process, and has high reliability and practicability.

Description

Sky coal column incision eye method for determining position is adopted in an a kind of shallow embedding closely side
Technical field
The invention belongs to mining Technology Underground Coal Mine field, relate in particular to a kind of shallow embedding closely a side adopt sky coal column incision eye method for determining position.
Background technology
In mining of closed distance coal seam group process, due to cut the section of eye large, be difficult for supporting, lower working face of coal seam can be arranged on leaving under coal column district of seam mining conventionally while layout; Thus, work plane just the stage of adopting will experience by Shang Fu coal column district and enter the recovery process under goaf, the exploitation that goes out a side and adopt sky coal column, as shown in Figure 3, d in figure mfor cutting the distance of covering a side on eye distance and adopt sky coal column border in lower coal seam.On-the-spot mining Practice and observed result show, in this process, there is serious pressure rack phenomenon in multiple work planes, the phenomenon of pressing that has occurred living support post instantaneous significantly lower contracting (exceeding 500mm), support are crushed to death or to cause that coal-winning machine cannot pass through etc. violent, has brought great impact to personnel's safety and the High-efficient Production of mine; And this type of disaster is composed in the recovery process of depositing mining area and is seemed particularly general at Shen Dong, the Yi Tai etc. of NORTHWEST CHINA portion shallow embedding contiguous seams.How to guarantee safety when similar work plane covers a side and adopts sky coal pillar mining on releasing, become above-mentioned mining area technical barrier urgently to be resolved hurrily.
For above-mentioned pressure rack disaster, correlative study, in conjunction with the mining conditions that covers a side in the part mine extraction of Shen Dong mining area and adopt sky coal column, is studied the inherent mechanism of its generation from the angle of the disrumpent feelings motion of coal column top key stratum.Result shows, when work plane goes out coal column, the coal column top disrumpent feelings block of key stratum cannot form stable bearing structure all the time with goaf, coal column border one side fault block body, and it is to cause the basic reason of pressure rack generation that the gyration of this structure passes to the excessive load of rock stratum and support between coal seam.Therefore, how to ensure that coal column top key stratum does not occur in the time going out coal column disrumpent feelings, 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 eye is cut in the upper difference of covering a side and adopting position under sky coal column in lower coal seam, will directly have influence on the disrumpent feelings movement pattern of coal column top key stratum and the size of transmitted load thereof.So, rationally determine that the position that eye is cut in lower coal seam is the effective way that solves above-mentioned pressure rack problem.
At present, field engineering technician to shallow embedding closely underlying seam cut eye while arranging, merely using the supporting of whether being convenient to cut eye as according to designing, and fail to consider pressure rack control when covering a side in the extraction of follow-up work face adopts sky coal column.Therefore, be necessary to design one be specifically designed to shallow embedding closely a side adopt sky coal column incision eye method for determining position.
Summary of the invention
The object of the present invention is to provide a kind of shallow embedding closely a side adopt sky coal column incision eye method for determining position, be intended in conjunction with the concrete condition of coal seam occurrence of each mine and Strata Overlying The Seam lithology architectural feature, consider as a whole between coal seam buried depth, upper and lower coal seam spacing, coal seam and whether have key stratum, key strata of covering rock breaking span etc., establish accordingly shallow embedding closely a side adopt the computational methods of sky coal column incision eye position, instruct the research that solves 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 be achieved in that a kind of shallow embedding closely a side adopt sky coal column incision eye method for determining position, comprise the following steps:
S1, collect and will arrange to cut and in a correspondence, cover a side and adopt near the boring column data of sky coal column;
S2, according to the data collected, adopt specifically the hole differentiation of key strata of covering rock position under column condition of Judging key stratum software;
Between S3, the upper and lower coal seam of basis, situation is deposited in the tax of key stratum, carries out determining of Qie Yan position, lower coal seam according to each self-corresponding method.
Preferably, in step S1, described boring column data is for mine generaI investigation, detailed survey or scrutinize the surface drilling block diagram drilling through in process.
Preferably, in step S2, described Judging key stratum software is KSPB, and national Copyright in Computer Software is numbered 2008SR34419.
Preferably, in step S3, described in cut a method for determining position and comprise following detailed process:
(1) between upper and lower coal seam during without key stratum
Cut when eye is arranged and should avoid coal column top key stratum generation cantilevered disrumpent feelings, also should ensure to cut simultaneously eye on cover outside coal column boundary stress peak value; Cut a position d mshould meet suc 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 key stratum, can be according to upper seam mining time, the measured value of periodic weighting step pitch be determined; 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) while there is 1 layer of key stratum between upper and lower coal seam
For the exploitation situation that has 1 layer of key stratum between coal seam, its layout of cutting eye can more be goed deep into coal column inside, only need the gyroscopic action that ensures the disrumpent feelings block of coal column top key stratum not exert an influence to force piece, can set up according to this mechanical model as shown in Figure 4.Can cut determining of a position according to key stratum disrumpent feelings block revolution amount and these 2 aspects of the disrumpent feelings structural stability of key stratum.
Pressing the disrumpent feelings block revolution of key stratum amount calculates: 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 has absorbed the disrumpent feelings block G of coal column top key stratum 1.Therefore, if the revolution amount between coal seam when key stratum 2 first breaking is compared with large and can absorb the revolution amount of disrumpent feelings block G time, the support of work plane will can not be affected so.So, the deflection Δ of the corresponding key stratum 2 disrumpent feelings blocks of coal column boundary bshould meet Δ b>=Δ 1, wherein, Δ 2for the rotary space of key stratum 2 disrumpent feelings blocks.And
&Delta; b = 2 ( L 2 - d m ) L 2 &Delta; 2 - - - ( 2 )
Can obtain by abbreviation thus:
d m≤(1-0.5Δ 1/Δ 2)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 of covering load on should ensureing makes the unlikely generation landing of key stratum 2 first breaking block articulated structure unstability, 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 key stratum 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 left side pin joint relatively, l b=d m/ 2+L 2/ 4; L 2for the first breaking step pitch of key stratum 2, can be 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' be that 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 working resistance, support width and the support distance of face roof under control of force piece; R 0for the frictional force of block hinged place, t, be respectively horizontal thrust and friction factor between the disrumpent feelings sillar of key stratum 2, 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 (being the angle of the plane of disruption and level rock) and the angle of revolution of key stratum 2 disrumpent feelings blocks; σ cfor the uniaxial compressive strength of key stratum 2 disrumpent feelings blocks.
When Practical Calculation, calculate by formula (3), formula (4) respectively, then get its higher value as a final position of rationally cutting.
Certainly, if while there is more than 2 layers or 2 layers multilayer key stratums between upper and lower coal seam, similar when Qie Yan position, lower coal seam exists 1 layer of key stratum between rule and above-mentioned coal seam really, what make between coal seam one deck key stratum topmost disrumpent feelingsly meets formula (3) or formula (4).
The present invention overcomes the deficiencies in the prior art, provide a kind of shallow embedding closely a side adopt sky coal column incision eye method for determining position, 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, adopt position of key stratum method of discrimination to determine each key position layer by layer in overlying strata; Secondly, according to whether existing key stratum to carry out determining of Qie Yan position, lower coal seam according to each self-corresponding method between upper and lower coal seam.If between coal seam,, without key stratum, the distance of cutting eye distance coal column border need be less than the periodic failure distance of coal column top key stratum, and outside coal column boundary stress peak value; If while 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 the lower bracket resistance relative middle pin joint of load that disrumpent feelings block revolution is transmitted with coal column top key stratum thereof reach equalising torque, or make the revolution amount of this key stratum first breaking block disrumpent feelings block of key stratum above the deflection of coal column border correspondence position reaches coal column.
The present invention has not only considered above to cover a side and has adopted sky coal column boundary stress peak value to cutting the impact of eye driving and supporting, but also the impact that above coal column, the disrumpent feelings motion of key stratum occurs Face Ground Pressure Behavior and pressure rack disaster while having considered that time working face of coal seam covers a side and adopts sky coal column in extraction, its reliability has obtained the checking of engineering measurement.The present invention can adapt to next side of different exploitation condition and adopt sky coal column below and cut determining of a position, and the safe and efficient production when can be shallow embedding contiguous seams and repeating to exploit provides safeguard, and its result of calculation is reliable, practical.
Brief description of the drawings
Fig. 1 be in the embodiment of the present invention shallow embedding closely a side adopt the flow chart of steps of sky coal column incision eye location determining method;
Fig. 2 be shallow embedding of the present invention closely a side adopt sky coal column incision eye method for determining position;
Fig. 3 is that shallow embedding is closely descended in working face of coal seam extraction, to cover a side and adopt the schematic diagram of sky coal pillar mining;
Fig. 4 is shallow embedding while closely there is 1 layer of key stratum between upper and lower coal seam, the mechanical model of this key stratum first breaking block structure;
Fig. 5 adopts K34 boring column and position of key stratum near sky coal column and differentiates result covering a side on 12102 work planes of stone Ge platform colliery in actual application of the present invention;
Fig. 6 adopts K33 boring column and position of key stratum near sky coal column and differentiates result covering a side on 12104 work planes of stone Ge platform colliery 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 clearer, 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, is not intended to limit the present invention.
Sky coal column incision eye method for determining position is adopted in an a kind of shallow embedding closely side, as depicted in figs. 1 and 2, comprises the following steps:
S1, collect and will arrange to cut and in a correspondence, cover a side and adopt near the boring column data of sky coal column;
In step S1, the surface drilling block diagram that collected boring column data is mainly work plane periphery at mine generaI investigation, detailed survey or drills through in scrutinizing process.
S2, according to the data collected, adopt specifically the hole differentiation of key strata of covering rock position under column condition of Judging key stratum software;
In step S2, described Judging key stratum software is KSPB, and national Copyright in Computer Software is numbered 2008SR34419.In utilizing Judging key stratum software KSPB to differentiate key strata of covering rock position, need to input series of parameters according to the full column of surface drilling, as: the thickness of rock stratum, modulus of elasticity, tensile strength, unit weight, rock stratum is disrumpent feelings angle and unconsolidated formation load carry-over factor.Wherein, rock parameter and depth of stratum can obtain 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.
Between S3, the upper and lower coal seam of basis, situation is deposited in the tax of key stratum, carries out determining of Qie Yan position, lower coal seam according to each self-corresponding method.
In step S3, determine that lower coal seam cuts eye and adopt the position below sky coal column in the upper side of covering.If there is not key stratum between upper and lower coal seam, cut the distance d on eye distance coal column border mneed be less than the periodic failure of coal column top key stratum apart from l 1, and outside coal column boundary stress peak value, should meet the condition shown in formula (1).And if while there is 1 layer or multilayer key stratum between upper and lower coal seam, cutting eye can more go deep into coal column internal placement, only needs to ensure the frictional force R of upper key stratum first breaking structure front end pin joint between coal seam 0and lower bracket resistance R zjthe load F that disrumpent feelings block revolution is transmitted with coal column top key stratum brelatively, pin joint reaches equalising torque, or makes the deflection Δ of this key stratum first breaking block at coal column border correspondence position breach the revolution amount Δ of the disrumpent feelings block of coal column top key stratum 1, 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 eyes, be illustrated in figure 5 and cover a side and adopt near the position of key stratum of K34 boring column sky coal column and differentiate result, differentiating result from the position of key stratum of column can find out, 12102 work planes residing 1 -2coal with on cover 1 on-2between coal, exist without key stratum, therefore, should cut determining of a position 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, can calculate and cover 1 on-2coal one side is adopted sky coal column border Width of Plastic Zone Y=0.4m.Because cutting a width D=7.5m, above cover 1 on-2it is l that period from practical measurement when coal mining is pressed step pitch 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 eyes, be illustrated in figure 6 and cover a side and adopt near the position of key stratum of K33 boring column sky coal column and differentiate result, differentiate result from the position of key stratum of column and can find out, 12104 work planes residing 1 -2coal with on cover 1 on-2between coal, only there is 1 layer of key stratum, therefore, should cut determining of a position according to formula (3) or formula (4).First according to formula (3), cover 1 on known by K33 boring column 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, can calculate Δ 1=1.102m, Δ 2=0.582m; Because of Δ 1> Δ 2, the revolution amount while not meeting key stratum first breaking between coal seam can absorb the requirement of the disrumpent feelings block revolution amount in coal column top, therefore, cannot calculate according to formula (3), can only calculate according to formula (4).
Get L according to the contiguous work plane First Weighting Interval of Main of 12104 work planes measured value 2=43.0m, coal column top key stratum breaking length presses step pitch to get l by upper seam mining period from practical measurement 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 boring column, between coal seam key stratum deadweight and and coal column top key stratum 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 285 ° and 8 ° of values respectively, get 0.3.Thus according to formula (4) can calculate cut eye reasonable Arrangement position should be d m≤ 35.7m.
In embodiments of the present invention, not only consider above to cover a side and adopted sky coal column boundary stress peak value to cutting the impact of eye driving and supporting, but also the impact that above coal column, the disrumpent feelings motion of key stratum occurs Face Ground Pressure Behavior and pressure rack disaster while having considered that time working face of coal seam covers a side and adopts sky coal column in extraction, its reliability has obtained the checking of engineering measurement.The present invention can adapt to next side of different exploitation condition and adopt sky coal column below and cut determining of a position, and the safe and efficient production when can be shallow embedding contiguous seams and repeating to exploit provides safeguard, and its result of calculation is reliable, practical.
Than the shortcoming and defect of prior art, the present invention has following beneficial effect:
(1) not only consider above to cover a side and adopted sky coal column boundary stress peak value to cutting the impact of eye driving and supporting, but also the impact that above coal column, the disrumpent feelings motion of key stratum occurs Face Ground Pressure Behavior and pressure rack disaster while having considered that time working face of coal seam covers a side and adopts sky coal column in extraction, its reliability has obtained the checking of engineering measurement.
(2) the present invention can adapt to next side of different exploitation condition and adopts sky coal column below and cut determining of a position, and the safe and efficient production when can be shallow embedding contiguous seams and repeating to exploit provides safeguard, and 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 of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (4)

  1. Shallow embedding closely a side adopt a sky coal column incision eye method for determining position, it is characterized in that comprising the following steps:
    S1, collect and will arrange to cut and in a correspondence, cover a side and adopt near the boring column data of sky coal column;
    S2, according to the data collected, adopt specifically the hole differentiation of key strata of covering rock position under column condition of Judging key stratum software;
    Between S3, the upper and lower coal seam of basis, situation is deposited in the tax of key stratum, carries out determining of Qie Yan position, lower coal seam according to each self-corresponding method; If between upper and lower coal seam,, without key stratum, the distance of cutting eye distance coal column border need be less than the periodic failure distance of coal column top key stratum, and outside coal column boundary stress peak value; If while 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 the lower bracket resistance relative middle pin joint of load that disrumpent feelings block revolution is transmitted with coal column top key stratum thereof reach equalising torque, or make the revolution amount of this key stratum first breaking block disrumpent feelings block of key stratum above the deflection of coal column border correspondence position reaches coal column.
  2. Shallow embedding as claimed in claim 1 closely a side adopt sky coal column incision eye method for determining position, it is characterized in that, in step S1, described boring column data is for mine generaI investigation, detailed survey or scrutinize the surface drilling block diagram drilling through in process.
  3. Shallow embedding as claimed in claim 1 closely a side adopt sky coal column incision eye method for determining position, it is characterized in that, in step S2, described Judging key stratum software is KSPB, national Copyright in Computer Software is numbered 2008SR34419.
  4. Shallow embedding as claimed in claim 1 closely a side adopt sky coal column incision eye method for determining position, it is characterized in that, described definite method further comprises:
    (1) between upper and lower coal seam during without key stratum
    Cut when eye is arranged and should avoid coal column top key stratum generation cantilevered disrumpent feelings, also should ensure to cut simultaneously eye on cover outside coal column boundary stress peak value; Cut a position d mshould meet suc 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 key stratum, can be according to upper seam mining time, the measured value of periodic weighting step pitch be determined; 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) while there is 1 layer of key stratum between upper and lower coal seam
    For the exploitation situation that has 1 layer of key stratum between coal seam, its layout of cutting eye can more be goed deep into coal column inside, only needs the gyroscopic action that ensures the disrumpent feelings block of coal column top key stratum not exert an influence to force piece;
    Pressing the disrumpent feelings block revolution of key stratum amount calculates: 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 has absorbed the disrumpent feelings block G of coal column top key stratum 1; Therefore, if the revolution amount between coal seam when key stratum 2 first breaking is compared with large and can absorb the revolution amount of disrumpent feelings block G time, the support of work plane will can not be affected so; So, the deflection Δ of the corresponding key stratum 2 disrumpent feelings blocks of coal column boundary bshould meet Δ b>=Δ 1, wherein, Δ 2for the rotary space of key stratum 2 disrumpent feelings blocks; And
    &Delta; b = 2 ( L 2 - d m ) L 2 &Delta; 2 - - - ( 2 )
    Can obtain by abbreviation thus:
    D m≤ (1-0.5 Δ 1/ Δ 2) 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 of covering load on should ensureing makes the unlikely generation landing of key stratum 2 first breaking block articulated structure unstability, 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 key stratum 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 left side pin joint relatively, l b=d m/ 2+L 2/ 4; L 2for the first breaking step pitch of key stratum 2, can be 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' be that 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 working resistance, support width and the support distance of face roof under control of force piece; R 0for the frictional force of block hinged place, t, be respectively horizontal thrust and friction factor between the disrumpent feelings sillar of key stratum 2, 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 and the angle of revolution of key stratum 2 disrumpent feelings blocks; σ cfor the uniaxial compressive strength of key stratum 2 disrumpent feelings blocks;
    When Practical Calculation, calculate by formula (3), formula (4) respectively, then get its higher value as a final position of rationally cutting;
    Certainly, if while there is more than 2 layers or 2 layers multilayer key stratums between upper and lower coal seam, similar when Qie Yan position, lower coal seam exists 1 layer of key stratum between rule and above-mentioned coal seam really, what make between coal seam one deck key stratum topmost disrumpent feelingsly meets formula (3) or formula (4).
CN201410291453.4A 2014-06-25 2014-06-25 A kind of shallow embedding closely adopts sky coal column incision eye method for determining position in side Expired - Fee Related CN104074520B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410291453.4A CN104074520B (en) 2014-06-25 2014-06-25 A kind of shallow embedding closely adopts sky coal column incision eye method for determining position in side

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410291453.4A CN104074520B (en) 2014-06-25 2014-06-25 A kind of shallow embedding closely adopts sky coal column incision eye method for determining position in side

Publications (2)

Publication Number Publication Date
CN104074520A true CN104074520A (en) 2014-10-01
CN104074520B CN104074520B (en) 2016-04-27

Family

ID=51596086

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410291453.4A Expired - Fee Related CN104074520B (en) 2014-06-25 2014-06-25 A kind of shallow embedding closely adopts sky coal column incision eye method for determining position in side

Country Status (1)

Country Link
CN (1) CN104074520B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104594899A (en) * 2014-11-24 2015-05-06 山西潞安环保能源开发股份有限公司 Method for determining reasonable width of gob-side entrydriving narrow coal pillar
CN104712348A (en) * 2014-12-11 2015-06-17 山东科技大学 Large-mining-height working face gob-side small pillar roadway supporting method under hard immediate roof
CN105911606A (en) * 2016-05-16 2016-08-31 中国矿业大学 Mining overburden rock motion law in-situ observation drill hole layout method
CN106919744A (en) * 2017-02-23 2017-07-04 陕西煤业化工技术研究院有限责任公司 The determination method of shallow embedding mining of closed distance coal seam group first weight bracket support resistance
CN109711025A (en) * 2018-12-20 2019-05-03 西安科技大学 Shallow embedding low coverage house column type goaf Upward mining rock stratum stability analysis method
CN111208009A (en) * 2020-01-15 2020-05-29 太原理工大学 Method for testing stress distribution form of contact surface of key block of masonry beam
CN112610278A (en) * 2020-12-14 2021-04-06 陕西正通煤业有限责任公司 Method for judging coal seam dynamic disaster affected area by non-uniform key layer structure
CN113586151A (en) * 2021-07-12 2021-11-02 中煤天津设计工程有限责任公司 Method for judging position of overlying key layer in mine goaf based on model
CN116380188A (en) * 2023-05-19 2023-07-04 山东科技大学 Effective water storage amount measuring method for goaf underground reservoir

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2276267C1 (en) * 2005-03-10 2006-05-10 Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (технический университет)" Development method for thick steep coal seams liable to spontaneous ignition
CN102155224A (en) * 2011-01-27 2011-08-17 徐州矿务集团有限公司夹河煤矿 Parallel fully-mechanized working surface for coal mine open-off cut coal pillar
CN102505942A (en) * 2011-11-11 2012-06-20 山西晋城无烟煤矿业集团有限责任公司 Safe and fast driving method for large-section open-off cut time-by-time tunneling
CN103527198A (en) * 2013-10-21 2014-01-22 中国矿业大学 Hydraulic fracturing control method of cut tight roof/top coal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2276267C1 (en) * 2005-03-10 2006-05-10 Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (технический университет)" Development method for thick steep coal seams liable to spontaneous ignition
CN102155224A (en) * 2011-01-27 2011-08-17 徐州矿务集团有限公司夹河煤矿 Parallel fully-mechanized working surface for coal mine open-off cut coal pillar
CN102505942A (en) * 2011-11-11 2012-06-20 山西晋城无烟煤矿业集团有限责任公司 Safe and fast driving method for large-section open-off cut time-by-time tunneling
CN103527198A (en) * 2013-10-21 2014-01-22 中国矿业大学 Hydraulic fracturing control method of cut tight roof/top coal

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
许家林等: "关键层判别方法的计算机实现", 《矿山压力与顶板管理》 *
鞠金峰等: "神东矿区近距离煤层出一侧采空煤柱压架机制", 《岩石力学与工程学报》 *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104594899A (en) * 2014-11-24 2015-05-06 山西潞安环保能源开发股份有限公司 Method for determining reasonable width of gob-side entrydriving narrow coal pillar
CN104712348A (en) * 2014-12-11 2015-06-17 山东科技大学 Large-mining-height working face gob-side small pillar roadway supporting method under hard immediate roof
CN104712348B (en) * 2014-12-11 2019-03-29 山东科技大学 Large-mining-height working surface is along empty fender laneway support method under the hard direct top of one kind
CN105911606A (en) * 2016-05-16 2016-08-31 中国矿业大学 Mining overburden rock motion law in-situ observation drill hole layout method
CN106919744B (en) * 2017-02-23 2020-08-04 陕西煤业化工技术研究院有限责任公司 Method for determining support resistance of primary pressure support in shallow-buried short-distance coal seam group mining
CN106919744A (en) * 2017-02-23 2017-07-04 陕西煤业化工技术研究院有限责任公司 The determination method of shallow embedding mining of closed distance coal seam group first weight bracket support resistance
CN109711025A (en) * 2018-12-20 2019-05-03 西安科技大学 Shallow embedding low coverage house column type goaf Upward mining rock stratum stability analysis method
CN111208009A (en) * 2020-01-15 2020-05-29 太原理工大学 Method for testing stress distribution form of contact surface of key block of masonry beam
CN111208009B (en) * 2020-01-15 2022-04-22 太原理工大学 Method for testing stress distribution form of contact surface of key block of masonry beam
CN112610278A (en) * 2020-12-14 2021-04-06 陕西正通煤业有限责任公司 Method for judging coal seam dynamic disaster affected area by non-uniform key layer structure
CN112610278B (en) * 2020-12-14 2022-09-23 陕西正通煤业有限责任公司 Method for judging coal seam dynamic disaster affected area by non-uniform key layer structure
CN113586151A (en) * 2021-07-12 2021-11-02 中煤天津设计工程有限责任公司 Method for judging position of overlying key layer in mine goaf based on model
CN113586151B (en) * 2021-07-12 2024-02-02 中煤天津设计工程有限责任公司 Method for judging layer position of overlying key layer of mine goaf based on model
CN116380188A (en) * 2023-05-19 2023-07-04 山东科技大学 Effective water storage amount measuring method for goaf underground reservoir
CN116380188B (en) * 2023-05-19 2023-11-03 山东科技大学 Effective water storage amount measuring method for goaf underground reservoir

Also Published As

Publication number Publication date
CN104074520B (en) 2016-04-27

Similar Documents

Publication Publication Date Title
CN104074520B (en) A kind of shallow embedding closely adopts sky coal column incision eye method for determining position in side
He et al. Deep-hole directional fracturing of thick hard roof for rockburst prevention
CN103993878A (en) Water diversion fracture zone height estimating method
CN105350965B (en) Press prevention and controls exploiting colliery roadway bump
Kuang et al. The impact of key strata movement on ground pressure behaviour in the Datong coalfield
Wang et al. Characteristics and evolutions of gas dynamic disaster under igneous intrusions and its control technologies
Pan et al. Effect of premining on hard roof distress behavior: a case study
Zhang et al. Longwall mining–induced damage and fractures: Field measurements and simulation using FDM and DEM coupled method
Waclawik et al. Rock bolting at the room and pillar method at great depths
Bai et al. Some aspects of mining under aquifers in China
Zhu et al. Overburden movement characteristics of top-coal caving mining in multi-seam areas
Meng et al. In situ investigation and numerical simulation of the failure depth of an inclined coal seam floor: a case study
CN105574262A (en) Method for judging communicated areas in mine multi-layer mined-out regions
Tian et al. Development characteristics and field detection of overburden fracture zone in multiseam mining: A case study
Yin et al. Impacts of karst paleo-sinkholes on mining and environment in northern China
CN113250613B (en) Directional drilling and checking method for coal seam in small coal kiln goaf
Zhang et al. A simple and efficient way to detect the mining induced water-conducting fractured zone in overlying strata
Duan et al. New evaluation and prediction method to determine the risk of water inrush from mining coal seam floor
Liu et al. Study on the influence of coal face advancing distance on fault-activated water inrush
CN112031772B (en) Method for inducing overall damage of overlying residual coal pillars by using high-pressure water jet
CN102758629B (en) Method for enabling fully mechanized face to directly pass through collapse pillar by drilling weakened rock
Shi et al. Study on the mechanisms and prevention of water inrush events in a deeply buried high-pressure coal seam—a case study of the Chensilou coal mine in China
Lu et al. Fracture mechanics solution of confined water progressive intrusion height of mining fracture floor
Xiong et al. Study on the support capacity determination and movement law of overlying strata in a thin-bedrock large-cutting-height longwall panel
Zhang et al. Stress distribution and failure characteristics of deep inclined seam and overhead mining along strike longwall floor

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20160427

Termination date: 20170625