CN111335895B - Anti-impact method for wide narrow excavation of rock burst coal seam exploitation roadway - Google Patents
Anti-impact method for wide narrow excavation of rock burst coal seam exploitation roadway Download PDFInfo
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- CN111335895B CN111335895B CN202010316406.6A CN202010316406A CN111335895B CN 111335895 B CN111335895 B CN 111335895B CN 202010316406 A CN202010316406 A CN 202010316406A CN 111335895 B CN111335895 B CN 111335895B
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 205
- 239000003245 coal Substances 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000011435 rock Substances 0.000 title claims abstract description 33
- 230000005641 tunneling Effects 0.000 claims abstract description 44
- 238000013461 design Methods 0.000 claims abstract description 38
- 230000001965 increasing effect Effects 0.000 claims abstract description 15
- 238000011161 development Methods 0.000 claims description 120
- 238000005065 mining Methods 0.000 claims description 12
- 238000010276 construction Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000008093 supporting effect Effects 0.000 abstract description 19
- 239000007787 solid Substances 0.000 description 9
- 238000011084 recovery Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000001976 improved effect Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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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
Abstract
The invention provides an anti-impact method for wide excavation and narrow excavation of an exploitation roadway of a rock burst coal seam, which comprises the steps of increasing the design width of an original exploitation roadway by a preset value to obtain the width of a planned exploitation roadway, and reducing the design width of coal pillars between the original roadways to the preset value width. And constructing a first wide excavation roadway with a preset numerical width on any side in the first wide excavation roadway. And tunneling a second wide excavation roadway with the planned excavation roadway width along the first filling body, and constructing a second filling body on one side close to the first filling body in the second wide excavation roadway. And tunneling a third wide tunneling roadway along one side of the first wide tunneling roadway far away from the first filling body or one side of the second wide tunneling roadway far away from the second filling body, reserving an inter-roadway small coal pillar with the width of a preset value between the tunneling roadways, and constructing a third filling body at the side close to the inter-roadway small coal pillar in the third wide tunneling roadway. Thereby reducing the supporting pressure of the coal pillars between the roadway of the coal seam exploitation roadway of rock burst.
Description
Technical Field
The invention relates to the technical field of coal mine safety mining, in particular to an anti-impact method for wide excavation and narrow excavation of a rock burst coal seam exploitation roadway.
Background
Rock burst is a serious coal-rock dynamic disaster, and in recent years, a plurality of modern mines with extra production capacity have emerged in western mining areas to have rock burst accidents, wherein the rock burst accidents frequently occur in mine exploitation roadways in a different way. The development roadway is different from the stoping roadway, is a core junction of mine production and has the characteristics of long service time limit and high supporting and maintaining cost, so that once the development roadway has large deformation or rock burst accidents, the influence on the whole mine production is very large.
Through analyzing the accident reasons, the coal seam development roadway layout characteristics of the mines are found to be consistent: main transportation, auxiliary transportation and return air main lanes are arranged in a coal seam, and lane-to-lane wide coal pillars of about 50m are generally reserved for ensuring the service life of the lanes and preventing air leakage, but the arrangement mode brings serious negative effects at the same time, mainly comprising the fact that the double-peak supporting pressure level in the lane-to-lane wide coal pillars is high, and the supporting pressure peak values are respectively located at positions close to lane sides on the outer sides of the lane-to-lane wide coal pillars, so that the development lanes are large in deformation and difficult to maintain close to the coal pillar sides. In addition, the bearing pressure area is easier to be superposed with external dynamic load to induce rock burst accidents, thereby having great risks and hidden dangers.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide an anti-impact method for wide excavation and narrow excavation of a rock burst coal seam exploitation roadway, which overcomes or at least partially solves the above problems, can significantly reduce the supporting pressure of coal pillars between the rock burst coal seam exploitation roadways, solve the problem of large deformation of the sides of the exploitation roadways adjacent to the coal pillars in the arrangement of the wide coal pillars between roadways, and reduce the risk of occurrence of rock burst, and significantly improve the recovery rate of mine resources.
According to an aspect of the embodiment of the invention, an anti-impact method for wide excavation and narrow excavation of a rock burst coal seam exploitation roadway is provided, which includes:
acquiring the design width of an original exploitation roadway and the design width of coal pillars between the original roadways in the same exploitation arrangement form as the current exploitation arrangement form, increasing the design width of the original exploitation roadway by a preset value to obtain the width of a planned exploitation roadway, and reducing the design width of the coal pillars between the original roadways to the preset value width;
in the development roadway development process, a first wide development roadway with the planned development roadway width is developed, and a first filling body with the preset numerical width is constructed on the side, close to any roadway side, of the first wide development roadway;
tunneling a second wide-tunneling roadway with the planned tunneling roadway width along the first filling body, and constructing a second filling body with the preset numerical width on one side, close to the first filling body, in the second wide-tunneling roadway;
and tunneling a third wide excavation roadway with the planned exploitation roadway width along one side of the first wide excavation roadway far away from the first filling body or one side of the second wide excavation roadway far away from the second filling body, reserving an inter-roadway small coal pillar with the width of the preset value between the excavation roadways, and constructing a third filling body with the preset value width at the side close to the inter-roadway small coal pillar in the third wide excavation roadway.
Optionally, the method further comprises: and excavating other multiple wide excavation development roadways according to the third wide excavation development roadway excavation mode, reserving an inter-roadway small coal pillar with the width of the preset numerical value between the wide excavation development roadways, and constructing a filling body with the preset numerical value width on the side close to the inter-roadway small coal pillar in the other wide excavation development roadways.
Optionally, the preset numerical range is 0.4-0.6 times of the original development roadway design width.
Optionally, the process of constructing the filling body includes:
reserving a roadway filling area with the preset numerical width at the position of a filling body to be constructed in the corresponding wide excavation development roadway;
and filling the roadway filling area to form a filling body.
Optionally, the filling of the roadway filling area to form a filling body includes:
after the tunneling working face is tunneled to a preset distance, filling the roadway filling area;
and keeping the filling construction progress of the filling area to be lagged by the tunneling progress of the tunneling working face by the preset distance so as to construct a filling body.
Optionally, the filling of the roadway filling area to form a filling body includes:
and filling the roadway filling area by adopting a high-water material to form a filling body, and connecting the filling body with a top plate of the wide excavation roadway.
Optionally, the excavation working face of the currently excavated wide excavation roadway and the excavation working face of the adjacent wide excavation roadway keep a specified lag offset, and the specified lag offset is equal to the lag offset of the original roadway in the same mining arrangement form as the current mining arrangement form.
According to another aspect of the embodiment of the invention, an anti-impact method for wide narrow excavation of a rock burst coal seam exploitation roadway is further provided, and the method comprises the following steps:
acquiring the design width of an original exploitation roadway and the design width of coal pillars between the original roadways in the same exploitation arrangement form as the current exploitation arrangement form, increasing the design width of the original exploitation roadway by a preset value to obtain the width of a planned exploitation roadway, and reducing the design width of the coal pillars between the original roadways to the preset value width;
in the development roadway development process, a first wide development roadway with the planned development roadway width is developed, and a first filling body with the preset numerical width is constructed on the side, close to any roadway side, of the first wide development roadway;
tunneling a second wide tunneling roadway with the planned tunneling roadway width from the distance position of the sum of the planned tunneling roadway width and the preset numerical width reserved for the first filling body, and constructing a second filling body with the preset numerical width on one side, close to the first filling body, in the second wide tunneling roadway;
and tunneling a third wide-excavation expansion roadway with the planned exploitation roadway width between the first wide-excavation expansion roadway and the second wide-excavation expansion roadway, reserving an inter-roadway small coal pillar with the width of the preset value between the first wide-excavation expansion roadway and the third wide-excavation expansion roadway or reserving the inter-roadway small coal pillar between the second wide-excavation expansion roadway and the third wide-excavation expansion roadway, and constructing a third filling body with the preset value width on one side of the third wide-excavation expansion roadway far away from the inter-roadway small coal pillar.
Optionally, the method further comprises: and tunneling a fourth wide excavation roadway with the planned exploitation roadway width along the side of the first wide excavation roadway far away from the first filling body or the side of the second wide excavation roadway far away from the second filling body, reserving an inter-roadway small coal pillar with the preset value width between the excavation roadways, and constructing a fourth filling body with the preset value width at the side close to the inter-roadway small coal pillar in the fourth wide excavation roadway.
Optionally, the method further comprises: and excavating other multiple wide excavation development roadways according to the fourth wide excavation development roadway excavation mode, reserving an inter-roadway small coal pillar with the width of the preset numerical value between the wide excavation development roadways, and constructing a filling body with the preset numerical value width on the side close to the inter-roadway small coal pillar in the other wide excavation development roadways.
According to the embodiment of the invention, the width of the coal seam development roadway is reasonably increased, the width of the coal pillar is reduced, and the filling body is constructed in the coal seam development roadway, so that the supporting pressure above the coal pillar between the roadways is transferred to the entity coal deep parts at two sides of the development roadway, the supporting pressure of the coal pillar between the roadways of the coal seam development roadway with rock burst is obviously reduced, and the risks of large deformation and rock burst at the side of the development roadway close to the coal pillar are effectively weakened. Furthermore, the reserved width of the coal pillars between the roadways is greatly reduced, and the recovery rate of mine resources can be obviously improved. And compared with the reserved coal pillars, the filling body has low bearing capacity, good yielding effect and better homogeneity and integrity, and is more favorable for developing daily maintenance of roadways and communication roadways.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a top view of a current coal mining coal seam development roadway and roadway wide coal pillar arrangement;
FIG. 2 is a schematic diagram showing a front view of the arrangement of the coal seam development roadway and the roadway wide pillars in FIG. 1 and a supporting pressure curve at the corresponding position;
fig. 3 is a schematic flow chart of an anti-impact method for wide narrow excavation of a rock burst coal seam development roadway according to an embodiment of the invention;
fig. 4 is a schematic flow chart of an anti-impact method for wide narrow excavation of a rock burst coal seam development roadway according to another embodiment of the invention;
FIG. 5 illustrates a front view of a coal seam wide excavation roadway and an arrangement of small pillars and fillers between the roadway, in accordance with an embodiment of the present invention;
fig. 6 shows a schematic illustration of a front view of the arrangement of wide excavation roadways and small pillars and fillers between roadways of fig. 5 and a supporting pressure curve at the corresponding position;
in FIGS. 1-2, 5-6, 1: developing an air return roadway; 2: developing a main transportation roadway; 3: developing an auxiliary transportation roadway; 4: wide coal pillars between lanes; 5: solid coal; 6: supporting pressure curves of the wide coal pillars among the lanes; 7: a solid coal bearing pressure curve; 8: widely excavating and developing an air return roadway; 9: widely excavating and developing a main transportation roadway; 10: widely excavating and extending an auxiliary transportation roadway; 11: a first packing body; 12: a second packing body; 13: small coal pillars between lanes; 14: a third packing body; 15: adjusting a back lane coal pillar supporting pressure curve; 16: and adjusting the solid coal supporting pressure curve.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The embodiment of the invention firstly introduces the reason of the rock burst of the common coal seam exploitation roadway. Referring to fig. 1, fig. 1 is a coal seam development roadway layout mode which is usually adopted, wherein an development return air roadway 1, a development main transportation roadway 2 and a development auxiliary transportation roadway 3 are sequentially excavated from left to right, and in order to avoid excavation disturbance, the roadways are sequentially excavated at staggered intervals from left to right, the roadway excavation staggered intervals are all 200m, and the reserved width of wide coal pillars 4 between the roadways is all 50 m. Referring to fig. 2, it can be clearly seen that 3 developed inter-roadway wide coal pillars 4 bear overburden pressure together with solid coal 5 on both sides, where an inter-roadway wide coal pillar support pressure curve 6 of the inter-roadway wide coal pillars 4 exhibits a dual-peak form due to a limited bearing width, and a peak portion is closer to a roadway coal wall than a solid coal support pressure curve 7, and the existence of a support pressure peak closer to the roadway coal wall has a risk of directly inducing rock burst. Meanwhile, the coal seam roadway inevitably has the characteristics of loose, weak and broken surrounding rocks, so that the coal seam exploitation roadway is seriously damaged and has large deformation under the influence of the supporting pressure of the overlying rock stratum, and the exploitation roadway is used as a core hub for air return, transportation and auxiliary transportation of the whole mine, thereby seriously threatening the safe and orderly operation of the mine.
In order to solve the technical problem, an embodiment of the invention provides an anti-impact method for a rock burst coal seam development roadway wide narrow excavation, and fig. 3 shows a flow schematic diagram of the anti-impact method for the rock burst coal seam development roadway wide excavation narrow excavation according to an embodiment of the invention. Referring to fig. 3, the method includes steps S302 to S308.
Step S302, obtaining the original exploitation roadway design width and the original roadway coal pillar design width under the same exploitation arrangement form as the current exploitation arrangement form, increasing the original exploitation roadway design width by a preset value to obtain a planned exploitation roadway width, and reducing the original roadway coal pillar design width to the preset value width.
Step S304, in the development roadway development process, a first wide development roadway with the planned development roadway width is developed, and a first filling body with the preset numerical width is constructed on the side, close to any roadway side, of the first wide development roadway.
In this step, any one side of the first wide-excavation roadway may be the left side of the first wide-excavation roadway or the right side of the first wide-excavation roadway. The development roadway of the embodiment of the invention can be a development return roadway, a development main transportation roadway, a development auxiliary transportation roadway and the like.
And S306, tunneling a second wide-tunneling roadway with the planned roadway width along the first filling body, and constructing a second filling body with a preset numerical width on one side, close to the first filling body, in the second wide-tunneling roadway.
Step S308, a third wide excavation roadway with the planned excavation roadway width is excavated along the side, far away from the first filling body, of the first wide excavation roadway or the side, far away from the second filling body, of the second wide excavation roadway, small roadway coal pillars with the width being a preset value are reserved among the excavation roadways, and a third filling body with the width being a preset value is constructed on the side, close to the small roadway coal pillars, of the third wide excavation roadway.
According to the embodiment of the invention, the width of the coal seam development roadway is reasonably increased, the width of the coal pillar is reduced, and the filling body is constructed in the coal seam development roadway, so that the supporting pressure above the coal pillar between the roadways is transferred to the entity coal deep parts at two sides of the development roadway, the supporting pressure of the coal pillar between the roadways of the coal seam development roadway with rock burst is obviously reduced, and the risks of large deformation and rock burst at the side of the development roadway close to the coal pillar are effectively weakened. Furthermore, the reserved width of the coal pillars between the roadways is greatly reduced, and the recovery rate of mine resources can be obviously improved. And compared with the reserved coal pillars, the filling body has low bearing capacity, good yielding effect and better homogeneity and integrity, and is more favorable for developing daily maintenance of roadways and communication roadways.
In the embodiment of the present invention, the number of the wide-excavation roadways may be not only 3, but also 4, 5, or the like. For other multiple wide excavation development roadways for subsequent excavation, excavation can be carried out according to a third wide excavation development roadway excavation mode, small roadway coal pillars with the width being a preset numerical value are reserved among the wide excavation development roadways, and filling bodies with the preset numerical value width are similarly constructed on the sides of the small roadway coal pillars adjacent to the other wide excavation development roadways.
In the embodiment of the invention, the width of each wide excavation roadway is the width of the planned excavation roadway, and the filling bodies with preset numerical value widths are constructed in each wide excavation roadway, so that the spacing of the excavation roadways reserved after the filling bodies are constructed in each wide excavation roadway is equal.
It should be noted that, in this embodiment, the first wide excavation roadway, the second wide excavation roadway, and the third wide excavation roadway are named according to the excavation sequence of the wide excavation roadway, and are not a specific one of the excavation roadways, and in this embodiment, the excavation sequence of the first wide excavation roadway, the second wide excavation roadway, the third wide excavation roadway, and the other wide excavation roadways is according to the sequence from left to right or from right to left. No matter what kind of tunneling sequence is adopted to tunnel the wide-tunnel excavation roadways, the arrangement form of each finally tunneled wide-tunnel excavation roadway is consistent with the arrangement form of the wide-tunnel excavation roadway obtained by the tunneling sequence of the previous step, namely, the filling bodies constructed in two adjacent wide-tunnel excavation roadways are arranged adjacently, no coal pillar is reserved between the two adjacent wide-tunnel excavation roadways, or a small coal pillar between the two adjacent wide-tunnel excavation roadways is reserved, and the filling body in one wide-tunnel excavation roadway is arranged adjacently to the small coal pillar between the roadways.
Usually, a lag offset is set between different development roadways in the development roadway development process, the development roadway development can be carried out according to the lag offset of the original roadway under the same mining arrangement form as the current mining arrangement form, and the development working face of the current development roadway and the development working face of the adjacent development roadway are kept at the specified lag offset. For example, if the lag offset of the original roadway is 200m, the heading face heading for the second wide heading roadway lags behind the heading face of the first wide heading roadway by 200m, the heading face heading for the third wide heading roadway lags behind the heading face of the second wide heading roadway by 200m, and the other wide heading roadways also heading according to the lag offset.
Referring to the step S302, in an embodiment of the invention, the preset value range may be a value range 0.4 to 0.6 times of the original development roadway design width. For example, the preset value is 0.5 time of the design width of the original exploitation roadway, the design width of the original exploitation roadway is 6m, and the design width of the coal pillars between the original roadways is 50m, so that the design width of the original exploitation roadway is increased by 0.5 time, that is, the design width of the original exploitation roadway is increased by 3m, the width of the obtained planned exploitation roadway is 9m, and the width of the reduced coal pillars is 3 m.
In an embodiment of the invention, the processes of constructing the first filling body, the second filling body and the third filling body in the first wide excavation roadway, the second wide excavation roadway and the third wide excavation roadway respectively and constructing the filling bodies in other wide excavation roadways are the same.
Specifically, in the process of constructing the filling body, a roadway filling area with a preset numerical value (such as 3m) width is reserved at the position of the filling body to be constructed in the corresponding wide excavation roadway, and then the roadway filling area is filled to construct the filling body, wherein the constructed filling body has a width of 3 m.
In the embodiment of the invention, the width of the roadway filling area is equal to the preset value of the increased design width of the original development roadway and is equal to the width of the small coal pillars between the roadways. For example, the design width of the original development roadway is increased by 3m, the width of the small coal pillars between roadways is 3m, the width of the roadway filling area is also 3m, and the width of the filling body after the roadway filling area is filled is also 3 m. The width of the filling body is consistent with the width of the small coal pillars between the lanes.
In an embodiment of the present invention, in the process of filling and constructing the filling body in the roadway filling area, in order to avoid affecting the excavation of the excavation working face and ensure the safety of the roadway roof, the filling construction of the filling area may lag behind the preset distance of the excavation working face, and the preset distance may be determined according to the space required by the excavation working face operation equipment and the roof support mode, which is not specifically limited in the embodiment of the present invention.
Therefore, in the process of filling the roadway filling area to form the filling body, the tunneling working face is tunneled to a preset distance, then the roadway filling area is filled, and the filling construction progress of the filling area is kept to lag behind the tunneling working face tunneling progress preset distance in the filling construction process of the roadway filling area so as to form the filling body.
In one embodiment of the invention, the filling body can be made of a material with uniform and compact characteristics, and compared with a coal wall, dynamic phenomena such as coal explosion, ejection and the like are not easy to generate. For example, the filling body can be formed by filling a roadway filling area with a high-water material, and the filling body is connected with a top plate of the roadway with wide excavation. The filling material may be other similar materials, and the embodiment of the present invention is not limited thereto.
Based on the same invention concept, the embodiment of the invention also provides another anti-impact method for wide excavation and narrow excavation of a rock burst coal seam exploitation roadway. Referring to fig. 4, the method includes steps S402 to S408.
Step S402, obtaining the original exploitation roadway design width and the original roadway coal pillar design width in the same exploitation arrangement form as the current exploitation arrangement form, increasing the original exploitation roadway design width by a preset value to obtain a planned exploitation roadway width, and reducing the original roadway coal pillar design width to the preset value width.
Step S404, in the development tunnel development process, a first wide development tunnel with the planned development tunnel width is developed, and a first filling body with the preset numerical width is constructed on the side, close to any one tunnel side, of the first wide development tunnel.
In this step, any one side of the first wide excavation roadway may be the left side of the first wide excavation roadway or the right side of the first wide excavation roadway. The development roadway of the embodiment of the invention can be a development return roadway, a development main transportation roadway, a development auxiliary transportation roadway and the like.
Step S406, a second wide excavation roadway with the planned exploitation roadway width is excavated from the distance position of the sum of the planned exploitation roadway width and the preset numerical width reserved in the first filling body, and a second filling body with the preset numerical width is constructed on one side, close to the first filling body, in the second wide excavation roadway.
Step S408, a third wide-excavation expansion roadway with the planned development roadway width is excavated between the first wide-excavation expansion roadway and the second wide-excavation expansion roadway, an inter-roadway small coal pillar with the width of a preset value is reserved between the first wide-excavation expansion roadway and the third wide-excavation expansion roadway or an inter-roadway small coal pillar is reserved between the second wide-excavation expansion roadway and the third wide-excavation expansion roadway, and a third filling body with the preset value width is constructed on one side of the third wide-excavation expansion roadway far away from the inter-roadway small coal pillar.
In an embodiment of the present invention, the number of wide-excavation development roadways may be not only 3, but also 4. According to the embodiment of the invention, a fourth wide excavation roadway with the planned exploitation roadway width can be further excavated along the side of the first wide excavation roadway far away from the first filling body or the side of the second wide excavation roadway far away from the second filling body, small coal pillars between roadways with the preset width are reserved between the exploitation roadways, and a fourth filling body with the preset width is constructed on the side of the fourth wide excavation roadway close to the small coal pillars between roadways.
Of course, the number of the wide-excavation exploitation roadways may be other numbers such as more than 4, and the number of the wide-excavation exploitation roadways is not specifically limited in the embodiment of the present invention. For other multiple wide excavation development roadways for subsequent excavation, excavation can be carried out according to a fourth wide excavation development roadway excavation mode, small roadway coal pillars with the width being a preset value are reserved among the wide excavation development roadways, and filling bodies with the preset value width are similarly constructed on the sides of the small roadway coal pillars adjacent to the other wide excavation development roadways.
In the embodiment of the invention, the width of each wide excavation roadway is the width of the planned excavation roadway, and the filling bodies with preset numerical value widths are constructed in each wide excavation roadway, so that the spacing of the excavation roadways reserved after the filling bodies are constructed in each wide excavation roadway is equal.
It should be noted that, in this embodiment, the first wide excavation roadway, the second wide excavation roadway, the third wide excavation roadway and the fourth wide excavation roadway are named according to the excavation sequence of the wide excavation roadway, and are not specific to a certain excavation roadway, and the excavation sequence of the first wide excavation roadway, the second wide excavation roadway and the third wide excavation roadway in this embodiment is according to the sequence of first left, then right, then middle or first right, then left, and then middle. For other descriptions of the wide mining development roadway, reference may be made to the above embodiments, and details are not described herein.
In order to more clearly embody the content of the above embodiment of the present invention, referring to fig. 5, the erosion prevention process for wide excavation and narrow excavation of the development roadway of the embodiment of the present invention is described by taking the sequential excavation from left to right of 3 development roadways (development return roadway, development main transportation roadway, development auxiliary transportation roadway) as an example.
Assuming that the design width of the original development roadway obtained in the same mining arrangement form as the current mining arrangement form is 6m, the width of the enlarged planned development roadway is 9m, and the width of the small interbay coal pillars 13 obtained after the design width of the original interbay coal pillars is reduced is 3 m.
In the development tunnel excavation process, firstly, a wide development return air tunnel 8 (corresponding to the first wide development tunnel) which is positioned at the leftmost side and is 9m is excavated, a 3m tunnel filling area is arranged at the right side of the wide development return air tunnel 8, the tunnel filling area is subjected to filling construction to form a first filling body 11, and the preset distance of the excavation working face of the wide development return air tunnel 8 after the filling construction is kept in the process of constructing the first filling body 11.
Then, at the position of 200m of the driving face of the lag wide-excavation return air tunnel 8, a 9m wide-excavation main transport tunnel 9 (corresponding to the above second wide-excavation tunnel) is driven along the first filling body 11 on the right side of the wide-excavation return air tunnel 8, a 3m tunnel filling area is arranged on the left side of the wide-excavation main transport tunnel 9, the tunnel filling area is filled to construct a second filling body 12, and the driving face of the lag wide-excavation return air tunnel 8 in the filling construction is kept at a preset distance in the process of constructing the second filling body 12. And, the second filling body 12 is ensured to be sufficiently contacted with the first filling body 11 to prevent air leakage between the roadways.
Finally, at the position of 200m of the driving face of the lag wide-excavation main driving roadway 9, a 9m wide-excavation auxiliary driving roadway 10 (corresponding to the third wide-excavation driving roadway above) is driven along the position of the right side of the wide-excavation main driving roadway 9 where 3m small coal pillars 13 between roadways are reserved, a 3m roadway filling area is arranged at the left side of the wide-excavation auxiliary driving roadway 10, the roadway filling area is subjected to filling construction to form a third filling body 14, and the driving face preset distance of the lag wide-excavation main driving roadway 9 during the construction of the third filling body 14 is kept. And, guarantee third obturator 14 and the little coal pillar 13 full contact between the tunnel, prevent the tunnel air leakage.
In addition, in order to ensure that any filling body is fully hardened to meet the bearing requirement and fully abuts against the top (widely excavating and extending a roadway top plate), a stack type hydraulic support and an anchor net cable can be adopted at the front end of a filling area for supporting.
Referring to fig. 6, it can be seen that the adjusted supporting pressure curve 15 of the coal pillars between the roadways changes from the original bimodal morphology (see fig. 2) to a single peak, the peak value is greatly reduced, the overall supporting pressure is at a lower level, and the hidden danger of rock burst caused by high static load of the coal pillars between the roadways and small adjacent roadway distance of the peak value of the supporting pressure is effectively eliminated. The filling body has better integrity and homogeneity than a coal body, is not easy to deform greatly under the low-load working condition, and greatly saves the maintenance cost and the expansion cost of the roadway. Meanwhile, the whole width of the roadway group is reduced after the width of the development roadway is adjusted, and the bearing areas of the solid coal at two sides are increased, so that the adjusted solid coal bearing pressure curve 16 is transferred to the deep part of the solid coal, the minimum distance of the bearing pressure peak to the roadway is increased, and the risk of rock burst on the solid coal side of the roadway is effectively reduced.
Furthermore, the reserved width of the coal pillar is greatly reduced, so that the resource recovery rate can be obviously improved, and the recovery difficulty of the permanent coal pillar at the last stage of exploitation is reduced.
All or a portion of the steps of implementing the foregoing method embodiments may be performed by hardware (e.g., a computing device such as a personal computer, a server, or a network device) associated with program instructions, which may be stored in a computer-readable storage medium, and when the program instructions are executed by a processor of the computing device, the computing device performs all or a portion of the steps of the method described in the embodiments of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments can be modified or some or all of the technical features can be equivalently replaced within the spirit and principle of the present invention; such modifications or substitutions do not depart from the scope of the present invention.
Claims (10)
1. The anti-impact method for wide excavation and narrow excavation of the rock burst coal seam development roadway is characterized by comprising the following steps of:
acquiring the design width of an original exploitation roadway and the design width of coal pillars between the original roadways in the same exploitation arrangement form as the current exploitation arrangement form, increasing the design width of the original exploitation roadway by a preset value to obtain the width of a planned exploitation roadway, and reducing the design width of the coal pillars between the original roadways to the preset value width;
in the development roadway development process, a first wide development roadway with the planned development roadway width is developed, and a first filling body with the preset numerical width is constructed on the side, close to any roadway side, of the first wide development roadway;
tunneling a second wide-tunneling roadway with the planned tunneling roadway width along the first filling body, and constructing a second filling body with the preset numerical width on one side, close to the first filling body, in the second wide-tunneling roadway;
and tunneling a third wide excavation roadway with the planned exploitation roadway width along one side of the first wide excavation roadway far away from the first filling body or one side of the second wide excavation roadway far away from the second filling body, reserving an inter-roadway small coal pillar with the width of the preset value between the excavation roadways, and constructing a third filling body with the preset value width at the side close to the inter-roadway small coal pillar in the third wide excavation roadway.
2. The method of claim 1, further comprising:
and excavating other multiple wide excavation development roadways according to the third wide excavation development roadway excavation mode, reserving an inter-roadway small coal pillar with the width of the preset numerical value between the wide excavation development roadways, and constructing a filling body with the preset numerical value width on the side close to the inter-roadway small coal pillar in the other wide excavation development roadways.
3. The method according to claim 1 or 2,
the preset numerical range is 0.4-0.6 times of the original development roadway design width.
4. The method of claim 1 or 2, wherein the construction of the pack comprises:
reserving a roadway filling area with the preset numerical width at the position of a filling body to be constructed in the corresponding wide excavation development roadway;
and filling the roadway filling area to form a filling body.
5. The method of claim 4, wherein the filling of the roadway filling area to form a filling body comprises:
after the tunneling working face is tunneled to a preset distance, filling the roadway filling area;
and keeping the filling construction progress of the filling area to be lagged by the tunneling progress of the tunneling working face, wherein the lag distance is the preset distance, so as to construct a filling body.
6. The method of claim 4, wherein the filling of the roadway filling area to form a filling body comprises:
and filling the roadway filling area by adopting a high-water material to form a filling body, and connecting the filling body with a top plate of the wide excavation roadway.
7. The method according to claim 1 or 2,
the method comprises the steps that a specified lagging offset distance is kept between a tunneling working face of a currently tunneling wide tunneling and extending roadway and a tunneling working face of an adjacent wide tunneling and extending roadway, and the specified lagging offset distance is equal to the lagging offset distance of an original roadway in the same mining and arranging form of a current mining and arranging form.
8. The anti-impact method for wide excavation and narrow excavation of the rock burst coal seam development roadway is characterized by comprising the following steps of:
acquiring the design width of an original exploitation roadway and the design width of coal pillars between the original roadways in the same exploitation arrangement form as the current exploitation arrangement form, increasing the design width of the original exploitation roadway by a preset value to obtain the width of a planned exploitation roadway, and reducing the design width of the coal pillars between the original roadways to the preset value width;
in the development roadway development process, a first wide development roadway with the planned development roadway width is developed, and a first filling body with the preset numerical width is constructed on the side, close to any roadway side, of the first wide development roadway;
tunneling a second wide tunneling roadway with the planned tunneling roadway width from the distance position of the sum of the planned tunneling roadway width and the preset numerical width reserved for the first filling body, and constructing a second filling body with the preset numerical width on one side, close to the first filling body, in the second wide tunneling roadway;
and tunneling a third wide-excavation expansion roadway with the planned exploitation roadway width between the first wide-excavation expansion roadway and the second wide-excavation expansion roadway, reserving an inter-roadway small coal pillar with the width of the preset value between the first wide-excavation expansion roadway and the third wide-excavation expansion roadway or reserving the inter-roadway small coal pillar between the second wide-excavation expansion roadway and the third wide-excavation expansion roadway, and constructing a third filling body with the preset value width on one side of the third wide-excavation expansion roadway far away from the inter-roadway small coal pillar.
9. The method of claim 8, further comprising:
and tunneling a fourth wide excavation roadway with the planned exploitation roadway width along the side of the first wide excavation roadway far away from the first filling body or the side of the second wide excavation roadway far away from the second filling body, reserving an inter-roadway small coal pillar with the preset value width between the excavation roadways, and constructing a fourth filling body with the preset value width at the side close to the inter-roadway small coal pillar in the fourth wide excavation roadway.
10. The method of claim 9, further comprising:
and excavating other multiple wide excavation development roadways according to the fourth wide excavation development roadway excavation mode, reserving an inter-roadway small coal pillar with the width of the preset numerical value between the wide excavation development roadways, and constructing a filling body with the preset numerical value width on the side close to the inter-roadway small coal pillar in the other wide excavation development roadways.
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| CN103953346A (en) * | 2014-05-13 | 2014-07-30 | 中国矿业大学 | Non-chain-pillar exploitation method |
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