CN113216968A - Pressure relief and scour prevention method for coal seam merging area - Google Patents
Pressure relief and scour prevention method for coal seam merging area Download PDFInfo
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- CN113216968A CN113216968A CN202110616000.4A CN202110616000A CN113216968A CN 113216968 A CN113216968 A CN 113216968A CN 202110616000 A CN202110616000 A CN 202110616000A CN 113216968 A CN113216968 A CN 113216968A
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- 239000003245 coal Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000002265 prevention Effects 0.000 title claims abstract description 15
- 238000005553 drilling Methods 0.000 claims abstract description 27
- 230000005641 tunneling Effects 0.000 claims abstract description 22
- 238000010276 construction Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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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Abstract
The invention discloses a pressure relief and scour prevention method for a coal seam merging area, which comprises the following steps: s10: after the head of the tunneling machine is tunneled to the boundary line of the coal seam merging area for the first time, the tunneling machine is retreated to exit the tunnel; s20, drilling a first hole group on the head-on surface of the coal body towards which the head of the heading machine faces by using a drilling machine; s30: after the first hole group is drilled, a drilling machine is used for drilling a second hole group for the coal sides of the coal bodies on two sides of the roadway; s40: enabling the tunneling machine to enter the roadway again and continue tunneling to a certain distance in the head-on direction, then enabling the tunneling machine to exit again, and repeating the steps S20 and S30; s50: repeating steps S20-S40 until a coal seam merge zone is passed; wherein: the first orifice set includes a first plurality of relief orifices arranged in a pitch and the second orifice set includes a second plurality of relief orifices arranged in a pitch.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a pressure relief and scour prevention method for a coal seam merging area.
Background
In a coal seam merging area, because the coal thickness is obviously increased, the tunneling tunnel inevitably leaves bottom coal, and the tunneling tunnel bottom coal body generates higher horizontal stress concentration after the bottom coal is left, so that elastic energy is accumulated, and impact display occurs. In order to eliminate or reduce the impact danger of the bottom coal around the roadway and the bottom coal in front of the roadway and eliminate an impact danger source, the pressure of the coal around the roadway needs to be relieved. The major diameter drilling pressure relief is the most coal body pressure relief measure used at present, and in the process of tunneling, the major diameter drilling of the traditional and conventional coal bodies is mainly constructed in the middle of the roadway side part, and is constructed in parallel with a coal bed, so that the pressure relief cannot be implemented on bottom coal below, and a pressure relief blind area exists.
Disclosure of Invention
In order to solve the technical problems in the prior art, the embodiment of the invention provides a pressure-relief and anti-impact method for a coal seam merging area.
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:
a pressure relief and scour prevention method for a coal seam merging area comprises the following steps:
s10: after the head of the tunneling machine is tunneled to the boundary line of the coal seam merging area for the first time, the tunneling machine is retreated to exit the tunnel;
s20, drilling a first hole group on the head-on surface of the coal body towards which the head of the heading machine faces by using a drilling machine;
s30: after the first hole group is drilled, a drilling machine is used for drilling a second hole group for the coal sides of the coal bodies on two sides of the roadway;
s40: and (4) enabling the tunneling machine to enter the roadway again to continue tunneling to a certain distance in the head-on direction, then enabling the tunneling machine to exit again, and repeating the steps S20 and S30.
S50: repeating steps S20-S40 until a coal seam merge zone is passed; wherein:
the first orifice set includes a first plurality of relief orifices arranged in a pitch and the second orifice set includes a second plurality of relief orifices arranged in a pitch.
Preferably, after the heading machine exits the roadway each time, the drilling machine at least drills a group of first hole groups on the head-on face; at least one first pressure relief orifice is angled downwardly in the first orifice group.
Preferably, after the heading machine exits the roadway each time, the drilling machine at least drills three groups of second holes on the coal side of the roadway; the three groups of second hole groups are arranged at intervals; wherein:
at least one second pressure relief hole is angled downward in each second hole set.
Preferably, the first group of holes drilled near the head-on face is no more than 10m from the head-on face after the entry-driving machine exits.
Preferably, the heading machine exits the roadway to perform drilling construction of S20, S30 every time the heading machine does not exceed 3 m.
Preferably, the spacing between two adjacent second groups of holes is 1m-2 m.
Preferably, the depth of the first pressure relief hole is 25m-30 m; the depth of the second pressure relief hole is 20m-25 m.
Preferably, the first pressure relief hole roots of adjacent first groups of holes are spaced apart by 0.5m to 1 m.
Preferably, the roots of adjacent second pressure relief holes of the second group of holes are spaced apart by 0.5m to 1 m.
Preferably, the first pressure relief hole and the second pressure relief hole are not less than 125mm in diameter.
Compared with the prior art, the method for pressure relief and scour prevention of the coal seam merging area disclosed by the invention has the beneficial effects that:
the first hole group and the second hole group which are arranged in a pitching mode are drilled on the head-on surface and the coal side of the roadway, so that stress in the coal body is reduced to form a pressure relief area, the stress of the coal body at the bottom of the coal is weakened by enabling the pressing hole to extend downwards in an inclined mode, and then the ground pressure impact disaster caused by high stress concentration in the coal body thickening area can be effectively avoided.
The summary of various implementations or examples of the technology described in this disclosure is not a comprehensive disclosure of the full scope or all features of the disclosed technology.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different instances of similar components. The drawings illustrate various embodiments, by way of example and not by way of limitation, and together with the description and claims, serve to explain the inventive embodiments. The same reference numbers will be used throughout the drawings to refer to the same or like parts, where appropriate. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.
Fig. 1 is a flowchart of a method for pressure relief and scour prevention of a coal seam merging area according to an embodiment of the present invention.
Fig. 2 is a schematic plan view of a pressure relief drilling arrangement.
FIG. 3 is a schematic cross-sectional view of the arrangement of the pressure relief holes of the coal body upper.
Fig. 4 is a schematic cross-sectional view of a head-on pressure relief vent arrangement.
Detailed Description
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention have been omitted.
As shown in fig. 1, an embodiment of the present invention discloses a method for preventing pressure from being relieved and scour in a coal seam merging area, which includes:
s10: as shown in fig. 2 to 4, after the head of the heading machine (heading head) is first tunneled to the boundary line of the coal seam merging area, the heading machine is withdrawn from the tunneled roadway.
S20: the method comprises the steps of enabling a drilling machine to enter a roadway, drilling a head-on face (the face, facing the coal body, of the head of a tunneling machine) of the coal body by utilizing the drilling machine, and drilling a first hole group, wherein the first hole group comprises three first pressure relief holes (19#, 20#, 21#), the three first pressure relief holes are located on the same plane and are arranged in a pitching mode, the 19# is perpendicular to the head-on face, and the 20#, 21# are inclined downwards to extend to the bottom of the coal.
The distance between the roots of two adjacent first pressure relief holes in the first hole group is 0.5-1 m, the depth of the first pressure relief holes is 25-30 m, and the diameter of the first pressure relief holes is not less than 125 mm; the included angle between two adjacent first pressure relief holes is about 15 degrees.
S30: after the first hole group is drilled, three groups of six second hole groups are respectively drilled on two sides of the roadway by using a drilling machine, and each group of the second hole groups comprises three second pressure relief holes, namely 18 second pressure relief holes (1#, 2#, 3# … 16#, 17#, 18 #). The three second pressure relief holes of each group of second hole groups are located on the same plane and are arranged in a pitching mode, one second pressure relief hole in each group of second hole groups is perpendicular to the coal side, the other two second pressure relief holes are inclined downwards and extend towards the coal bottom, for example, the second pressure relief hole 1# is perpendicular to the coal side, and the second pressure relief holes 2# and 3# are inclined downwards and extend towards the coal bottom.
The distance between two adjacent groups of second hole groups is 1m-2m, the distance between the roots of two adjacent first pressure relief holes in the first hole groups is 0.5m-1m, the depth of the second pressure relief holes in each group of second hole groups is 20m-25m, and the diameter of each second pressure relief hole is not less than 125 mm; the angle between two adjacent first pressure relief holes in each second group of holes is approximately 15.
S40: and (4) enabling the tunneling machine to enter the roadway again to continue tunneling towards the head-on direction for a certain distance (the distance is not more than 3m), then enabling the tunneling machine to exit again, and repeating the steps S20 and S30.
S50, repeating the steps S20 to S40 until the coal seam merging area is passed; wherein: such that after each drilling a first group of holes close to the head-on face is drilled at a distance of not more than 10m from the head-on face.
The pressure relief and scour prevention method for the coal seam merging area provided by the invention has the advantages that:
the first hole group and the second hole group which are arranged in a pitching mode are drilled on the head-on surface and the coal side of the roadway, so that stress in the coal body is reduced to form a pressure relief area, the stress of the coal body at the bottom of the coal is weakened by enabling the pressing hole to extend downwards in an inclined mode, and then the ground pressure impact disaster caused by high stress concentration in the coal body thickening area can be effectively avoided.
Moreover, although exemplary embodiments have been described herein, the scope of the present invention includes any and all embodiments based on the present invention with equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or alterations. The elements of the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.
The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. In addition, in the above-described embodiments, various features may be grouped together to streamline the disclosure. This should not be interpreted as an intention that a disclosed feature not claimed is essential to any claim. Rather, inventive subject matter may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
Claims (10)
1. A pressure relief and scour prevention method for a coal seam merging area is characterized by comprising the following steps:
s10: after the head of the tunneling machine is tunneled to the boundary line of the coal seam merging area for the first time, the tunneling machine is retreated to exit the tunnel;
s20, drilling a first hole group on the head-on surface of the coal body towards which the head of the heading machine faces by using a drilling machine;
s30: after the first hole group is drilled, a drilling machine is used for drilling a second hole group for the coal sides of the coal bodies on two sides of the roadway;
s40: enabling the tunneling machine to enter the roadway again and continue tunneling to a certain distance in the head-on direction, then enabling the tunneling machine to exit again, and repeating the steps S20 and S30;
s50: repeating steps S20-S40 until a coal seam merge zone is passed; wherein:
the first orifice set includes a first plurality of relief orifices arranged in a pitch and the second orifice set includes a second plurality of relief orifices arranged in a pitch.
2. The method of claim 1, wherein the drilling machine drills at least one first set of holes in the face after each exit of the roadheader; at least one first pressure relief orifice is angled downwardly in the first orifice group.
3. The method for pressure relief and impact prevention in a coal seam merging area as claimed in claim 1, wherein the drilling machine drills three second hole groups at least for the coal side on each side of the roadway after the heading machine exits the roadway each time; the three groups of second hole groups are arranged at intervals; wherein:
at least one second pressure relief hole is angled downward in each second hole set.
4. The coal seam merging area pressure relief and impact prevention method of claim 1, wherein after the heading machine exits, the first hole group near the head-on face is drilled at a distance of no more than 10m from the head-on face.
5. The coal seam merging area pressure relief and impact prevention method as claimed in claim 1, wherein the heading machine exits the roadway to perform drilling construction of S20, S30 after every heading of not more than 3 m.
6. The method for pressure relief and impact protection in a coal seam merging area as claimed in claim 3, wherein the distance between two adjacent second hole groups is 1m-2 m.
7. The coal seam merging area pressure relief and impact prevention method as claimed in claim 1, wherein the depth of the first pressure relief hole is 25m-30 m; the depth of the second pressure relief hole is 20m-25 m.
8. The coal seam merging area pressure relief and impact prevention method as claimed in claim 1, wherein the distance between the roots of adjacent first pressure relief holes of the first hole group is 0.5m-1 m.
9. The coal seam merging area pressure relief and impact prevention method as claimed in claim 1, wherein the distance between the roots of adjacent second pressure relief holes of the second hole group is 0.5m to 1 m.
10. The method of pressure relief and impact protection in a coal seam merging area as claimed in claim 1, wherein the first pressure relief hole and the second pressure relief hole are not less than 125mm in diameter.
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| CN202110616000.4A CN113216968A (en) | 2021-06-02 | 2021-06-02 | Pressure relief and scour prevention method for coal seam merging area |
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| CN202110616000.4A CN113216968A (en) | 2021-06-02 | 2021-06-02 | Pressure relief and scour prevention method for coal seam merging area |
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Cited By (1)
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