CN104832175A - Method of beside-pillar double-side partial-filling ascending re-mining overhead coal seam - Google Patents
Method of beside-pillar double-side partial-filling ascending re-mining overhead coal seam Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
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- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
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- E—FIXED CONSTRUCTIONS
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- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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Abstract
The invention discloses a method of a beside-pillar double-side partial-filling ascending re-mining overhead coal seam. In the invention, on the basis of determining overhead coal seam mining feasibility and detecting distribution situations of a coal pillar group and a mined area group of a reamer-pillar remnant mining area, a beside-pillar double-side partial-filling method is employed for successively side-protecting the coal pillar group in the underlie reamer-pillar remnant mining area of the overhead coal seam and gradually mining the overhead coal resources. By means of the method, a beside-pillar double-side filling body formed in the mined area group can not only achieve a side-protecting effect on the reamer-pillar coal pillar group but also form a common bearing body therewith, thereby further reducing degree of stress concentration and creep deformation of the coal pillar group. The method can enhance long-term stability, can avoid local instantaneous unstability or domino-like unstable damage and finally can ensure safe mining of the overhead coal seam of the reamer-pillar remnant mining area.
Description
Technical field
The present invention relates to technical field of coal exploitation, especially relate to the method that the up second mining of the other bilateral part filling of a kind of post pedals sky coal seam, be mainly applicable to the safe working pedaling sky coal seam is covered in the residual exploiting field of tool post formula.
Background technology
Current, the contradiction of coal resources finiteness and consumption demand unlimitedness thereof.Residual coal second mining is the Important Action slowing down above-mentioned contradiction.Residual coal second mining not only can improve recovery ratio, the enterprise economic benefit of coal resources, and can extend mine service-life, promotes sustainable development.
In recent years, residual exploiting field, colliery Upward mining more and more becomes the focus that people pay close attention to.Be subject to mining influence in advance, the integrality of Deng Kong coal seam, residual exploiting field and floor strata thereof and stability all suffer damage in various degree, and then may cause mine disaster, impact safety in production.Therefore, residual exploiting field is covered the top priority pedaled sky safely mining of coalbed feasibility assessment Yu be determined to be Upward mining.Traditionally, the method for discrimination of residual exploiting field Upward mining feasibility mainly comprises: " three bands " diagnostic method, country rock equilibrium method, ratio discriminatory method and mathematical analysis method etc.CN101109283B pedals the feasibility of sky coal seam Upward mining from the angle quantitative identification of interlayer strata structure; CN104239697A adopts PCA first to carry out modeling to Upward mining influence factor, then adopt variance contribution ratio to carry out weight calculation to institute's established model, and then have rated the feasibility of Upward mining; CN103147737A provides a kind of detection method of Upward mining Overburden Failure Law, disclose the temporal and spatial evolution of Overburden Rock Failure in Upward mining process, solve the problem that Upward mining work plane and roadway layout are rationally determined, ensure that the safety of Upward mining.The aforementioned method of discrimination pedaling sky coal seam Upward mining feasibility mainly angularly to be started with research from interlayer depth of stratum and stability thereof, and it can realize differentiation in advance to Deng Kong coal seam, residual exploiting field Upward mining feasibility and evaluation, and then instructs engineering practice.
But the theoretical research of existing Upward mining and engineering practice rarely have the stability paying close attention to tool post formula residual exploiting field coal column group to the impact pedaling sky safely mining of coalbed.The stability of tool post formula residual exploiting field coal column group governs the safety pedaling sky coal seam Upward mining and carries out, its with on cover and pedal sky coal seam and floor strata forms a cogeneration system.Along with the formation gradually in the residual exploiting field of tool post formula, stope stress redistributes because of the releasing of coal column lateral stress.The stress of such tool post formula Remnant mining coal column will become from original equally distributed load the load that Relatively centralized distributes, and upwards covers gradually and to pedal in sky seat earth rock stratum diffusion and transmit.In the process, from outward appearance to inner essence can there is creep rupture in tool post formula residual exploiting field coal column, its effective bearing area also reduces gradually, will cause the distribution again of concentrated stress like this and expand the surrender width of coal column further, reducing the width in its elastic kernel district.When the effective bearing area of tool post formula residual exploiting field coal column continues to be reduced to its ultimate bearing area, instantaneous unstable failure will be there is.Now, the destruction wave of the instantaneous unstability generation of above-mentioned coal column may shift and be diffused into adjacent coal column, cause the unstable failure of tool post formula residual exploiting field coal column group " dominoes " formula, and then the globality and stability of pedaling sky coal seam and floor strata thereof are covered in impact, even produce the disasters such as bump, threaten safe and efficient production.
To sum up, need badly and find a kind of reinforcement and pedal sky coal seam and to underlie the method for tool post coal column group stability, and then effectively solution tool post formula residual exploiting field coal column group is pedaling the unstable failure that Local Instantaneous unstability or " dominoes " formula occur in sky seam mining process, and the safety that ultimate guarantee pedals sky coal seam Upward mining is carried out.
Summary of the invention
Technical problem to be solved by this invention is: provide the method that the up second mining of the other bilateral part filling of a kind of post pedals sky coal seam, efficiently solve tool post formula residual exploiting field coal column group at the unstable failure pedaling sky coal seam Upward mining process generation Local Instantaneous unstability or " dominoes " formula, ensure the safety pedaling sky coal seam Upward mining.
For solving the problems of the technologies described above, technical scheme of the present invention is: the method that the up second mining of the other bilateral part filling of a kind of post pedals sky coal seam is pedaled sky coal seam Upward mining feasibility in differentiation, verified on the basis of tool post formula residual exploiting field coal column group and dead zone group's distribution situation, adopt the method for post other bilateral part filling to protect and pedal sky coal seam and to underlie tool post formula residual exploiting field coal column group in side successively, and sky coal resources are pedaled in extraction gradually.Described technical scheme is specifically carried out according to following steps:
(1) differentiate and the feasibility pedaling sky coal seam Upward mining is covered in the residual exploiting field of tool post formula;
(2) in conjunction with the original geology of mine, technical data, exploration finds out that pedaling sky coal seam underlies the distribution situation of tool post formula residual exploiting field coal column group and dead zone group, draws tool post formula residual exploiting field coal column group and adopts to instruct safety to give birth to the distributional pattern figure of dead zone group;
(3) driving pedals the stope drift active workings in sky coal seam, arranges and pedals sky working face of coal seam;
(4) from top to bottom hole pedaling sky working face of coal seam base plate, arrange the transfer pipeline of dead zone, tool post formula residual exploiting field group's paste body filling;
(5) prepare fill paste, under the effect of filling pump, along the transfer pipeline of step (4), the lotion prepared evenly is injected dead zone, end, tool post formula residual exploiting field, make its end, setting and hardening tool setting pillar residual exploiting field coal column produce side and protect effect;
(6) sky working face of coal seam is pedaled in propelling, when exploitation line is advanced into 3-8m before boundary line, next tool post dead zone, stops propulsioning face;
(7) along with the propelling gradually pedaling sky coal seam, repeat the construction technology of step (4), (5) and (6), adopt the mode of post other bilateral part filling to protect tool post formula residual exploiting field coal column group in side successively, and sky coal resources are pedaled in extraction gradually.
Preferably, described step (1) adopts " three bands " diagnostic method, country rock equilibrium method, ratio discriminatory method, mathematical analysis method and Authorization Notice No. comes the feasibility pedaling sky coal seam Upward mining is covered in the residual exploiting field of comprehensive distinguishing tool post formula for the quantitative identification method described in CN101109283B.
Preferably, by investigation mine original geology, technical data, described step (2) investigates thoroughly that pedaling sky coal seam underlies the width, highly of tool post formula residual exploiting field dead zone group and coal column group, adopt three-dimensional laser scanner precisely to detect the distribution orientation of tool post formula residual exploiting field dead zone group, size and volume.
Preferably, described step (3) arranges stope drift active workings and the work plane of pedaling sky coal seam in the top of end, the tool post formula residual exploiting field coal column that step (2) is verified.
Preferably, adopt casing drilling technology to carry out drilling construction in described step (4), bore dia d is 60-120mm, pitch of holes l is 5-20m, hole tiltangleθ is 10 °-60 °, drilling depth h is determined by interlayer depth of stratum H and bore inclining angle θ.
Preferably, described step (5) is gangue/discarded concrete according to mass percent: flyash: cement: water reducing agent: the ratio of water=45%-55%:15%-20%:10%-15%:3%-5%:15%-25%, compound concentration is the fill paste of 75%-85%, and amount of preparation is explored the distributed dimension of each dead zone, the residual exploiting field of tool post formula found out by step (2) and volume of distribution is determined.
Preferably, in described step (5), the Stress control of filling pump is at 2-6MPa.
Preferably, the advance distance pedaling sky working face of coal seam in described step (6) is [(a+b) ± 5] m; Wherein, a is tool post formula residual exploiting field depletion region width, and b is tool post formula residual exploiting field coal pillar width.
Preferably, the width sum c of the other bilateral obturation of described step (7) center pillar
1+ c
2be less than the width a of dead zone, tool post formula residual exploiting field.
Adopt technique scheme, effective effect of the present invention is:
This invention is pedaled sky coal seam Upward mining feasibility in differentiation, is verified on the basis of tool post formula residual exploiting field coal column group and dead zone group's distribution situation, adopt the method for post other bilateral part filling to protect and pedal sky coal seam and to underlie tool post formula residual exploiting field coal column group in side successively, and sky coal resources are pedaled in extraction gradually.The other bilateral obturation of post that this invention is formed in the group of dead zone can not only be all risen to side and protects effect by tool setting pillar coal column, and common supporting body can be formed with it, and then reduce stress concentration degree and the deformation of creep of coal column group, strengthen long-time stability, avoid the unstable failure that Local Instantaneous unstability or " dominoes " formula occur, and the safe working pedaling sky coal seam is covered in the residual exploiting field of ultimate guarantee tool post formula.
Accompanying drawing explanation
Fig. 1 the residual exploiting field of tool post formula is covered pedal sky working face of coal seam layout schematic diagram;
Fig. 2 is the other filling schematic diagram of end, tool post formula residual exploiting field coal column post;
Fig. 3 the residual exploiting field of tool post formula is covered pedal sky working face of coal seam propelling schematic diagram;
Fig. 4 is dead zone, tool post formula residual exploiting field bundle pillar other bilateral part filling three-dimensional effect diagram;
Fig. 5 is dead zone, tool post formula residual exploiting field bundle pillar other bilateral part filling planar effect picture.
In figure: 1-pedal sky coal seam; 2-interlayer rock stratum; 3-tool post formula residual exploiting field coal column; Dead zone, 4-tool post formula residual exploiting field; 5-pedal sky working face of coal seam; The other bilateral part fill line road of 6-post; 7-tool post formula residual exploiting field Filling mine-out area body; A-tool post formula residual exploiting field depletion region width; B-tool post formula residual exploiting field coal pillar width; c
1obturation width on the left of dead zone ,-tool post formula residual exploiting field; c
2obturation width on the right side of dead zone ,-tool post formula residual exploiting field.
Detailed description of the invention
Following examples are intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.
In order to have clearer understanding to technical goal of the present invention, characteristic sum effect, the method that the up second mining of the other bilateral part filling of existing coupled columns by reference to the accompanying drawings pedals sky coal seam is described in further detail.
The nineties in 20th century, Xishan coal electricity group Bai Jiazhuan colliery surmounts No. 6 coal seams and has preferentially exploited coal seam, No. 8, bottom.At present, No. 6, Bai Jiazhuan colliery coal seam 36703 work plane ground location is positioned at mountain area, the ventilating shaft west and south, smelting valley, down-hole is positioned at hole, south 1001 level seven panel right flanks, left front portion is 36502 work plane goafs, left back portion is unworked country, right part is 36701 work plane unworked countries, and bottom is 38502 tool post formula goafs, belongs to the typical residual exploiting field of tool post formula covers to pedal sky coal seam.The stability of No. 8 coal seams 36502 tool post formula residual exploiting field coal column group seriously governs the safety that No. 6 coal seam 36703 work planes pedal null resource Upward mining and carries out.For above-mentioned situation, below in conjunction with accompanying drawing, implementation process of the present invention is described in further detail.
Step one, " three bands " diagnostic method, country rock equilibrium method, ratio discriminatory method, mathematical analysis method and Authorization Notice No. is adopted to be the quantitative identification method described in CN101109283B, the feasibility of No. 6 Deng Kong coal seam 1 Upward mining in colliery, the dialogue man village makes comprehensive distinguishing: pedal the warp damage that sky coal seam 1 is arranged in interlayer rock stratum 2, structural deterioration degree is less, only there occurs and moves integrally; No. 8 coal seams have the thick hard limestone that can play balanced action above the residual exploiting field of tool post formula, and it can ensure that the step changing of the relative positions does not occur to pedal sky coal seam 1; The mining influence multiple pedaling sky coal seam 1 and No. 8 coal seams is 6.8; The interlamellar spacing of Upward mining necessity is 10.4m, is significantly less than the thickness 27.9m pedaling sky coal seam 1 and interlayer rock stratum, No. 8 coal seams 2; Pedal sky coal seam 1 Upward mining and meet adopted situation described in quantitative identification method.To sum up, the residual exploiting field of tool post formula, No. 8 coal seams 36502, Bai Jiazhuan colliery is covered to pedal sky coal seam 1 Upward mining be feasible.
Step 2, knows according to original geology, technical data, and the width of tool post formula residual exploiting field, No. 8 coal seams 36502, Bai Jiazhuan colliery coal column 3 groups and 4 groups, dead zone, tool post formula residual exploiting field is respectively 5m-15m and 15-40m, is highly 3.8m; Adopt three-dimensional laser scanner precisely to reconnoitre the distribution orientation of 36502 tool post formula residual exploiting field coal column 3 groups and 4 groups, dead zone, tool post formula residual exploiting field, size and volume, draw the distributional pattern figure of tool post formula residual exploiting field, No. 8 coal seams 36502 coal column 3 groups and 4 groups, dead zone, tool post formula residual exploiting field to instruct the safe second mining pedaling sky coal seam 1 coal resources.
Step 3, starts to tunnel the stope drift active workings pedaling sky coal seam 1 above end, the tool post formula residual exploiting field coal column that step 2 is detected, and arranges the work plane 5 pedaling sky coal seam.
Step 4, casing drilling technology (creeping into while setting of casing) is adopted to hole from top to bottom pedaling sky working face of coal seam 5 base plate, bore dia d is 80mm, pitch of holes l is 12m, hole tiltangleθ is 30 °, drilling depth h is 30-36m, arranges the other bilateral part fill line road 6 of post.
Step 5, be gangue/discarded concrete according to mass percent: flyash: cement: water reducing agent: the ratio of water=50%:15%:15%:5%:15%, compound concentration is the fill paste of 80%, and its amount of preparation is explored the distributed dimension of each dead zone, the residual exploiting field of tool post formula, No. 8 coal seams 36502 found out by step 2 and volume is determined.
Step 6, under the effect of filling pump, along the post other bilateral part fill line road 6 that step 4 is arranged, the lotion prepared in step 5 is evenly injected and pedal sky coal seam 1 and to underlie dead zone, make it spread substantial, side is produced to end, tool post formula residual exploiting field, No. 8 coal seams 36502 coal column and protects effect.
Step 7, advances and pedals sky working face of coal seam 5 (advance distance is 20-25m), when exploitation line is advanced into 5m before boundary line, dead zone 4, next tool post formula residual exploiting field, stops propelling pedaling sky working face of coal seam 5.
Step 8, repeat step 4, five, the construction technology of six and seven, adopt the mode of post other bilateral part filling to protect tool post formula residual exploiting field, No. 8 coal seams 36502 coal column 3 groups in side successively, and sky coal seam 1 coal resources are pedaled in extraction gradually.
The above is the preferred embodiment of the present invention, it should be pointed out that any improvement of making above-mentioned implementation method under the prerequisite not departing from technical spirit of the present invention and principle and polishs, and all belongs to the protection domain of technical solution of the present invention.
Claims (10)
1. the up second mining of the other bilateral part filling of post pedals the method in sky coal seam, it is characterized in that, comprises the following steps:
(1) differentiate and the feasibility pedaling sky coal seam Upward mining is covered in the residual exploiting field of tool post formula;
(2) in conjunction with the original geology of mine, technical data, exploration finds out that pedaling sky coal seam underlies the distribution situation of tool post formula residual exploiting field coal column group and dead zone group, and the distributional pattern figure drawing tool post formula residual exploiting field coal column group and dead zone group keeps the safety in production to instruct;
(3) driving pedals the stope drift active workings in sky coal seam, arranges and pedals sky working face of coal seam;
(4) from top to bottom hole pedaling sky working face of coal seam base plate, arrange the transfer pipeline of dead zone, tool post formula residual exploiting field group's paste body filling;
(5) prepare fill paste, under the effect of filling pump, along the transfer pipeline of step (4), the lotion prepared evenly is injected dead zone, end, tool post formula residual exploiting field, make its end, setting and hardening tool setting pillar residual exploiting field coal column produce side and protect effect;
(6) sky working face of coal seam is pedaled in propelling, when exploitation line is advanced into 3-8m before boundary line, next tool post dead zone, stops propulsioning face;
(7) along with the propelling gradually pedaling sky coal seam, repeat the construction technology of step (4), (5) and (6), adopt the mode of post other bilateral part filling to protect tool post formula residual exploiting field coal column group in side successively, and sky coal resources are pedaled in extraction gradually.
2. the up second mining of the other bilateral part filling of post according to claim 1 pedals the method in sky coal seam, it is characterized in that, described step (1) adopts " three bands " diagnostic method, country rock equilibrium method, ratio discriminatory method, mathematical analysis method and Authorization Notice No. comes the feasibility pedaling sky coal seam Upward mining is covered in the residual exploiting field of comprehensive distinguishing tool post formula for the quantitative identification method described in CN101109283B.
3. the up second mining of the other bilateral part filling of post according to claim 1 pedals the method in sky coal seam, it is characterized in that, by investigation mine original geology, technical data, described step (2) investigates thoroughly that pedaling sky coal seam underlies the width, highly of tool post formula residual exploiting field dead zone group and coal column group, adopt three-dimensional laser scanner precisely to detect the distribution orientation of tool post formula residual exploiting field dead zone group, size and volume.
4. the up second mining of the other bilateral part filling of post according to claim 1 pedals the method in sky coal seam, it is characterized in that, described step (3) arranges stope drift active workings and the work plane of pedaling sky coal seam in the top of end, the tool post formula residual exploiting field coal column that step (2) is detected.
5. the up second mining of the other bilateral part filling of post according to claim 1 pedals the method in sky coal seam, it is characterized in that, described step (4) adopts casing drilling technology to carry out drilling construction, and bore dia d is 60-120mm, pitch of holes l is 5-20m, hole tiltangleθ is 10 °-60 °, drilling depth h is determined by interlayer depth of stratum H and bore inclining angle θ.
6. the up second mining of the other bilateral part filling of post according to claim 1 pedals the method in sky coal seam, it is characterized in that, fill paste is gangue/discarded concrete according to mass percent in described step (5): flyash: cement: water reducing agent: the proportions of water=45%-55%:15%-20%:10%-15%:3%-5%:15%-25% forms, and its concentration is for for 75%-85%.
7. the up second mining of the other bilateral part filling of post according to claim 1 pedals the method in sky coal seam, it is characterized in that, the amount of preparation of fill paste explores the distributed dimension of each dead zone, the residual exploiting field of tool post formula found out and volume of distribution is determined according to described step (2) in described step (5).
8. the up second mining of the other bilateral part filling of post according to claim 1 pedals the method in sky coal seam, it is characterized in that, in described step (5), the Stress control of filling pump is at 2-6MPa.
9. the up second mining of the other bilateral part filling of post according to claim 1 pedals the method in sky coal seam, and it is characterized in that, the advance distance pedaling sky working face of coal seam in described step (6) is [(a+b) ± 5] m; Wherein, a is the width of dead zone, tool post formula residual exploiting field, and b is the width of tool post formula residual exploiting field coal column.
10. the up second mining of the other bilateral part filling of post according to claim 1 pedals the method in sky coal seam, it is characterized in that, the width sum of the other bilateral obturation of described step (7) center pillar should be less than the width of dead zone, tool post formula residual exploiting field.
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| CN106121645A (en) * | 2016-06-24 | 2016-11-16 | 太原理工大学 | The method that coal column group is left in a kind of step structure residual exploiting field of filling second mining |
| CN109236297A (en) * | 2018-09-14 | 2019-01-18 | 太原理工大学 | Split the coal-mining method filled and leave coal seam in conjunction with the residual exploiting field of uplink second mining tool post |
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