CN111456805A - Waste rock filling and supporting method of ultra-thin coal seam based on N00 construction method - Google Patents
Waste rock filling and supporting method of ultra-thin coal seam based on N00 construction method Download PDFInfo
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- CN111456805A CN111456805A CN202010311949.9A CN202010311949A CN111456805A CN 111456805 A CN111456805 A CN 111456805A CN 202010311949 A CN202010311949 A CN 202010311949A CN 111456805 A CN111456805 A CN 111456805A
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- gangue
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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Abstract
The disclosure relates to the technical field of mine support, in particular to a gangue filling support method of an ultra-thin coal seam based on an N00 construction method. An extremely thin coal seam is clamped between a top plate rock mass and a bottom plate rock mass, an air inlet roadway and an air outlet roadway are reserved at two sides along with the advancing of a coal face, and gangue is generated; after the ultra-thin coal seam is mined, a goaf is formed between the roof rock mass and the floor rock mass. The waste filling support method is used for supporting the goaf and comprises the following steps: filling waste rocks at two sides of the goaf to form a first lane side and a second lane side; and pouring sealing slurry into the first lane side and the second lane side so that the first lane side and the second lane side are in airtight contact with the top plate rock mass and the bottom plate rock mass, and air can circulate along the air inlet tunnel, the coal face and the air outlet tunnel. According to the waste rock filling support method, waste rocks generated in the process of retaining a roadway are used for supporting the goaf, so that the waste rocks can be effectively treated, and the support cost of the goaf can be reduced.
Description
Technical Field
The disclosure relates to the technical field of mine support, in particular to a gangue filling support method of an ultra-thin coal seam based on an N00 construction method.
Background
The N00 construction method is characterized in that when mining of each coal face is carried out in a coal mining area, a part of a goaf is used for carrying out roof cutting and pressure relief to automatically form a roadway, the roadway does not need to be tunneled, a coal pillar does not need to be reserved, the cost can be reduced, resources can be saved, and the working efficiency and the profit can be further improved.
The method of N00 is adopted to mine the extremely thin coal seam, on one hand, a large amount of waste rock is generated, and the waste rock is difficult to process; on the other hand, the goaf needs to be supported by supporting equipment such as wooden columns and hydraulic pillars, but the supporting equipment cannot be reused, so that the supporting cost is high.
The above information disclosed in the background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute prior art that is known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a waste rock filling and supporting method of an extremely thin coal seam based on an N00 construction method, which can effectively treat waste rock generated in the process of roadway retaining and can reduce the supporting cost of a goaf.
In order to achieve the purpose, the technical scheme adopted by the disclosure is as follows:
according to one aspect of the disclosure, the ultra-thin coal seam is sandwiched between and forms a semi-coal rock mass with the roof rock mass and the floor rock mass; along with the advance of the coal face, reserving an air inlet tunnel and an air outlet tunnel at two sides of the coal face, and generating gangue; forming a goaf between the roof rock mass and the floor rock mass after mining the extremely thin coal seam in the half-coal rock mass;
the waste filling support method is used for supporting the goaf, and is characterized by comprising the following steps:
filling the gangue at the positions of two sides of the goaf to form a first roadway side and a second roadway side;
and pouring sealing slurry into the first lane side and the second lane side so that the first lane side and the second lane side are in airtight contact with the top plate rock mass and the bottom plate rock mass, and air can circulate along the air inlet tunnel, the coal face and the air outlet tunnel.
In an exemplary embodiment of the present disclosure, filling the gangue in positions on both sides of the gob includes:
transporting the gangue from the air inlet roadway and the air outlet roadway to the goaf;
and pushing the gangue to fill the positions on two sides of the goaf so as to form the first roadway side and the second roadway side.
In an exemplary embodiment of the disclosure, the first highwall and the second highwall extend in a direction of advancement of the coal face.
In an exemplary embodiment of the present disclosure, one side of the first lane side close to the air inlet lane is flush with a side wall of the air inlet lane, and one side of the second lane side close to the air outlet lane is flush with a side wall of the air outlet lane.
In an exemplary embodiment of the present disclosure, the first ledge and the second ledge are equal in width.
In an exemplary embodiment of the present disclosure, the width of the gob is 90 m to 110 m, and the widths of the first ledge and the second ledge are 20 m to 30 m.
In an exemplary embodiment of the present disclosure, pouring the sealing paste into the first ledge and the second ledge includes:
clamping grouting plates on two sides of the first lane side and the second lane side;
pouring the sealing slurry into the first lane side and the second lane side so that the sealing slurry fills the gap between the first lane side and the second lane side;
and removing the grouting plate after the sealing slurry is solidified.
In an exemplary embodiment of the present disclosure, the sealing slurry includes one or both of a yellow mud slurry or a cement slurry.
In an exemplary embodiment of the disclosure, the height of the air inlet tunnel and the air outlet tunnel is 2-3 meters, the thickness of the ultra-thin coal seam is 0.4-0.6 meter, and the bottom of the air inlet tunnel and the air outlet tunnel is flush with the top of the bottom plate rock mass;
the grouting plates are detachably mounted at the top of the bottom plate rock mass and can be clamped at two sides of the first lane side and the second lane side.
In an exemplary embodiment of the present disclosure, advancing the coal face and supporting the gob are performed simultaneously.
According to the waste rock filling and supporting method of the ultra-thin coal seam based on the N00 construction method, because the ultra-thin coal seam is clamped between the top plate rock mass and the bottom plate rock mass, along with the advance of the coal face, a goaf is formed between the top plate rock mass and the bottom plate rock mass after the ultra-thin coal seam is mined, and the goaf needs to be supported. Meanwhile, air inlet tunnels and air outlet tunnels are reserved at the two sides of the coal face, and a large amount of waste rocks are generated in the process of reserving tunnels.
According to the waste rock filling and supporting method, firstly, waste rocks generated in the roadway retaining process are filled at two sides of a goaf to form a first roadway side and a second roadway side, so that a top plate rock mass and a bottom plate rock mass are supported and protected; and secondly, pouring sealing slurry into the first lane side and the second lane side to enable the first lane side and the second lane side to be in airtight contact with a top plate rock mass and a bottom plate rock mass so as to prevent air in the air inlet tunnel from flowing to the air outlet tunnel through the first lane side and the second lane side, namely, the air can be ensured to flow along the air inlet tunnel, the coal face and the air outlet tunnel by pouring the sealing slurry.
Therefore, the coal ash generated during coal mining on the coal face can be taken away, and meanwhile, sufficient oxygen can be ensured to exist for workers on the coal face.
To sum up, the waste rock filling support method can support the goaf by using the waste rock generated in the roadway retaining process, not only can effectively treat the waste rock, but also can reduce the support cost of the goaf.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
FIG. 1 is a schematic structural diagram of a semi-coal rock mass according to an embodiment of the disclosure.
FIG. 2 is a schematic diagram of an N00 construction method for an ultra-thin coal seam according to an embodiment of the disclosure.
Fig. 3 is a flowchart illustrating a gangue filling supporting method for an ultra-thin coal seam according to an N00 construction method according to an embodiment of the present disclosure.
Fig. 4 is a cross-sectional view B-B of fig. 2.
Fig. 5 is a sectional view taken along line a-a of fig. 2.
In the figure: 1. a semi-coal rock mass; 10. a very thin coal seam; 11. roof rock mass; 12. a baseplate rock mass; 2. a coal face; 3. an air intake tunnel; 4. an air outlet tunnel; 5. a gob; 6. a first lane wall; 7. and a second lane side.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the primary technical ideas of the disclosure.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is turned upside down, the "up" component will become the "down" component. Other relative terms, such as "high," "low," "top," "bottom," "left," "right," and the like are also intended to have similar meanings.
When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure. The terms "a," "an," "the," and the like are used to denote the presence of one or more elements/components/parts; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc. The terms "first" and "second", etc. are used merely as labels, and are not limiting on the number of their objects.
As shown in fig. 1, the ultra-thin coal seam 10 can be sandwiched between the roof rock mass 11 and the floor rock mass 12, and forms a semi-coal rock mass 1 together with the roof rock mass 11 and the floor rock mass 12.
For example, the thickness of the ultra-thin coal seam 10 may be 0.4 m to 0.6 m, and the thicknesses of the roof rock mass 11 and the floor rock mass 12 are both greater than the thickness of the ultra-thin coal seam 10, and specific values are not particularly limited herein.
As shown in fig. 2, when an N00 construction method is used to mine an extremely thin coal seam 10 in a semi-coal rock mass 1, an air inlet tunnel 3 and an air outlet tunnel 4 are left at two sides of a coal face 2 along with the advance of the coal face 2.
For example, the heights of the air inlet tunnel 3 and the air outlet tunnel 4 can be 2-3 meters, so that the ventilation and normal coal transportation of the coal face 2 can be ensured, and the detailed description is omitted here. Because the height of the air inlet roadway 3 and the air outlet roadway 4 is generally larger than the thickness of the ultra-thin coal seam 10, the roof rock mass 11 and the floor rock mass 12 need to be excavated in the roadway retaining process, and then a large amount of gangue is generated.
Meanwhile, as the coal face 2 advances, the ultra-thin coal seam 10 is mined, and a goaf 5 is formed between the roof rock mass 11 and the floor rock mass 12.
For example, the width of the gob 5 may be 90 m to 110 m, and of course, the width of the gob 5 may have other values, which is not limited herein.
The embodiment of the disclosure provides a waste rock filling and supporting method of an ultra-thin coal seam based on an N00 construction method, which is used for supporting a goaf 5 formed after mining of an ultra-thin coal seam 10. As shown in fig. 3, the gangue filling support method may include the following steps:
step S110, filling gangue at two sides of the gob 5 to form a first roadway side 6 and a second roadway side 7;
step S120, pouring sealing slurry into the first lane slope 6 and the second lane slope 7 so that the first lane slope 6 and the second lane slope 7 are in airtight contact with the top plate rock mass 11 and the bottom plate rock mass 12, and air can circulate along the air inlet roadway 3, the coal face 2 and the air outlet roadway 4.
Therefore, on one hand, the first roadway side 6 and the second roadway side 7 formed by the gangue can support and protect the roof rock mass 11 and the floor rock mass 12; on the other hand, because the first lane side 6 and the second lane side 7 are in airtight contact with the top plate rock mass 11 and the bottom plate rock mass 12, air in the air intake lane 3 can be prevented from flowing to the air outlet lane 4 through the first lane side 6 and the second lane side 7, so that the air can be ensured to flow along the air intake lane 3, the coal face 2 and the air outlet lane 4, coal ash generated during coal mining of the coal face 2 is taken away, and a worker on the coal face 2 can be ensured to have sufficient oxygen.
To sum up, the waste rock filling support method can support the gob 5 by using the waste rock generated in the roadway retaining process, not only can effectively treat the waste rock, but also can reduce the support cost of the gob 5.
The following is a detailed description of each step of the waste rock filling support method provided by the embodiment of the disclosure:
in the step S110, the filling of the gangue in the positions on both sides of the gob 5 may include the steps of:
s1101, transporting the gangue to a goaf 5 from an air inlet roadway 3 and an air outlet roadway 4;
and step S1102, pushing gangue to fill the positions on the two sides of the gob 5 to form a first roadway side 6 and a second roadway side 7.
It should be noted that the first rib 6 and the second rib 7 may extend along the advancing direction of the coal face 2, that is, the first rib 6 may extend along the air inlet roadway 3, and the second rib 7 may extend along the air outlet roadway 4, so as to facilitate the transportation and filling of the gangue.
Meanwhile, one side, close to the air inlet roadway 3, of the first roadway side 6 can be flush with the side wall of the air inlet roadway 3, one side, close to the air outlet roadway 4, of the second roadway side 7 is flush with the side wall of the air outlet roadway 4, so that the side walls of the first roadway side 6 and the second roadway side 7 are flush, and workers can work in the air inlet roadway 3 and the air outlet roadway 4 conveniently.
As described above, the width of the gob 5 may be 90 m to 110 m, and in order to ensure the supporting effect of the first lane side 6 and the second lane side 7 on the roof rock mass 11 and the floor rock mass 12, on one hand, the widths of the first lane side 6 and the second lane side 7 may be equal, so as to prevent the eccentric moment from occurring when the roof rock mass 11 descends; on the other hand, the width of the first ledge 6 and the second ledge 7 may be 20 to 30 meters, and certainly may be greater than 30 meters, so that the supporting effect can be ensured, and the width is not particularly limited herein.
Of course, the gangue generated in the entry retaining of the air inlet tunnel 3 and the air outlet tunnel 4 can be filled into gangue bags, and then the gangue bags are filled into the positions at the two sides of the gob 5, which is not limited in particular.
In step S120, the filling of the sealing slurry into the first ledge 6 and the second ledge 7 may include the following steps:
step S1201, clamping the grouting plate on two sides of a first lane side 6 and a second lane side 7;
step S1202, pouring sealing slurry into the first lane side 6 and the second lane side 7, so that the gap between the first lane side 6 and the second lane side 7 is filled with the sealing slurry;
and step S1203, removing the grouting plate after the sealing slurry is solidified.
For example, the sealing slurry may include one or both of yellow mud slurry and cement slurry, and of course, other polymer materials may be used to achieve the sealing effect, which is not listed here.
In order to facilitate the pouring of the sealing paste, the first lane side 6 and the second lane side 7 can be clamped by a grouting plate such as an iron plate or a wood plate, and then the sealing paste is poured in, so that the grouting plate can prevent the liquid sealing paste from leaking and can ensure the flatness of the side walls of the first lane side 6 and the second lane side 7.
As mentioned above, the heights of the air inlet tunnel 3 and the air outlet tunnel 4 are generally greater than the thickness of the ultra-thin coal seam 10, so that the bottoms of the air inlet tunnel 3 and the air outlet tunnel 4 can be flush with the top of the floor rock body 12 as shown in fig. 4.
At this time, as shown in fig. 5, the ultra-thin coal seam 10 is located at the bottom of the coal face 2 to facilitate mining of the ultra-thin coal seam 10, and the gangue produced during the roadway-keeping process to fill the goaf 5 comes from the roof rock mass 11, which will not be described in detail.
In addition, the ultra-thin coal seam 10 is located at the bottom of the coal face 2, the first lane side 6 and the second lane side 7 are also located at the bottom of the coal face 2, and at this time, the grouting plates are installed at the bottoms of the air inlet roadway 3 and the air outlet roadway 4 (the top of the bottom plate rock mass 12) and clamped at two sides of the first lane side 6 and the second lane side 7, so that the installation process is convenient, and the working efficiency can be improved.
It should be noted that, as the coal face 2 advances, the gob 5 continues to extend, and the advancing of the coal face 2 and the supporting of the gob 5 can be performed simultaneously, and will not be described in detail herein.
It is to be understood that the disclosure is not limited in its application to the details of construction and the arrangements of the components set forth in the specification. The present disclosure is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications are within the scope of the present disclosure. It should be understood that the disclosure disclosed and defined in this specification extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute various alternative aspects of the present disclosure. The embodiments described in this specification illustrate the best mode known for carrying out the disclosure and will enable those skilled in the art to utilize the disclosure.
Claims (10)
1. A waste rock filling and supporting method of an ultra-thin coal seam based on an N00 construction method is characterized in that the ultra-thin coal seam is clamped between a top plate rock mass and a bottom plate rock mass and forms a half coal rock mass together with the top plate rock mass and the bottom plate rock mass; along with the advance of the coal face, reserving an air inlet tunnel and an air outlet tunnel at two sides of the coal face, and generating gangue; forming a goaf between the roof rock mass and the floor rock mass after mining the extremely thin coal seam in the half-coal rock mass;
the waste filling support method is used for supporting the goaf, and is characterized by comprising the following steps:
filling the gangue at the positions of two sides of the goaf to form a first roadway side and a second roadway side;
and pouring sealing slurry into the first lane side and the second lane side so that the first lane side and the second lane side are in airtight contact with the top plate rock mass and the bottom plate rock mass, and air can circulate along the air inlet tunnel, the coal face and the air outlet tunnel.
2. The gangue filling support method according to claim 1, wherein the step of filling the gangue in the positions on both sides of the goaf comprises the steps of:
transporting the gangue from the air inlet roadway and the air outlet roadway to the goaf;
and pushing the gangue to fill the positions on two sides of the goaf so as to form the first roadway side and the second roadway side.
3. The gangue fill support method of claim 1, wherein the first highwall and the second highwall extend in a direction of advancement of the coal face.
4. The gangue filling support method according to claim 3, wherein one side of the first side close to the air inlet roadway is flush with the side wall of the air inlet roadway, and one side of the second side close to the air outlet roadway is flush with the side wall of the air outlet roadway.
5. The gangue filling support method of claim 4, wherein the first highwall and the second highwall are equal in width.
6. The gangue filling support method as claimed in claim 5, wherein the width of the goaf is 90 m to 110 m, and the width of the first roadway side and the width of the second roadway side are 20 m to 30 m.
7. The gangue filling support method of claim 1, wherein the pouring of the sealing grout to the first roadway side and the second roadway side comprises:
clamping grouting plates on two sides of the first lane side and the second lane side;
pouring the sealing slurry into the first lane side and the second lane side so that the sealing slurry fills the gap between the first lane side and the second lane side;
and removing the grouting plate after the sealing slurry is solidified.
8. The gangue filling support method of claim 1, wherein the sealing grout comprises one or both of yellow mud or cement grout.
9. The waste filling support method according to claim 7, wherein the height of the air inlet tunnel and the air outlet tunnel is 2-3 m, the thickness of the ultra-thin coal seam is 0.4-0.6 m, and the bottoms of the air inlet tunnel and the air outlet tunnel are flush with the top of the bottom plate rock mass;
the grouting plates are detachably mounted at the top of the bottom plate rock mass and can be clamped at two sides of the first lane side and the second lane side.
10. The gangue fill support method as claimed in claim 1, wherein advancing the coal face and supporting the gob are performed simultaneously.
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| CN202010311949.9A CN111456805B (en) | 2020-04-20 | 2020-04-20 | Waste rock filling and supporting method of ultra-thin coal seam based on N00 construction method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4019327A (en) * | 1971-09-20 | 1977-04-26 | Thyssen (Great Britain) Limited | Mining |
| CN101021153A (en) * | 2007-02-23 | 2007-08-22 | 中国矿业大学 | Waste filling thin coal seam tunnelling method |
| CN103089299A (en) * | 2013-01-16 | 2013-05-08 | 中国矿业大学 | Obligate cavity channel gob-side entry retaining wall filling method |
| CN107387084A (en) * | 2017-09-15 | 2017-11-24 | 中国矿业大学 | A kind of gob side entry retaining reduces the construction method for cutting top depth |
| CN109611140A (en) * | 2019-02-27 | 2019-04-12 | 河南理工大学 | One kind 110 and N00 engineering method exploitation working face goaf air flow transport characteristics simulating test device and application method |
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2020
- 2020-04-20 CN CN202010311949.9A patent/CN111456805B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4019327A (en) * | 1971-09-20 | 1977-04-26 | Thyssen (Great Britain) Limited | Mining |
| CN101021153A (en) * | 2007-02-23 | 2007-08-22 | 中国矿业大学 | Waste filling thin coal seam tunnelling method |
| CN103089299A (en) * | 2013-01-16 | 2013-05-08 | 中国矿业大学 | Obligate cavity channel gob-side entry retaining wall filling method |
| CN107387084A (en) * | 2017-09-15 | 2017-11-24 | 中国矿业大学 | A kind of gob side entry retaining reduces the construction method for cutting top depth |
| CN109611140A (en) * | 2019-02-27 | 2019-04-12 | 河南理工大学 | One kind 110 and N00 engineering method exploitation working face goaf air flow transport characteristics simulating test device and application method |
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