CN116104495B - Obstacle-passing stoping method for gob-side entry retaining coal face - Google Patents
Obstacle-passing stoping method for gob-side entry retaining coal face Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 46
- 238000005065 mining Methods 0.000 claims description 28
- 230000004888 barrier function Effects 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 5
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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 provides an obstacle-passing stoping method for a gob-side entry retaining coal face, and relates to the technical field of obstacle-passing stoping of coal faces. The method comprises the steps of digging a detour roadway, digging an auxiliary cut roadway and stoping, specifically, respectively digging a front straight detour and a rear straight detour which are perpendicular to the stoping direction and communicated with the roadway between two adjacent working surfaces in front of and behind the stoping point according to the geological condition of the stoping point, and digging a side straight detour which is communicated with the two working surfaces in the stoping direction between the two working surfaces to form the detour roadway; and digging an auxiliary cut roadway which is perpendicular to the stoping direction and communicated with the roadway between two adjacent working surfaces on the same side of the detouring roadway, wherein the length of the auxiliary cut roadway is consistent with the lengths of the front straight detouring roadway and the rear straight detouring roadway, and the auxiliary cut roadway is used for realizing detouring roadway retaining when the current working surface is stoped. The method is convenient for retaining the roadway by bypassing the roadway shape rule; during stoping, the change times of the width of the working face are extremely small, so that the propelling speed of the working face is guaranteed; in addition, the method leaves small coal pillars.
Description
Technical Field
The invention relates to the technical field of coal face obstacle-passing stoping, in particular to an obstacle-passing stoping method for a gob-side entry retaining coal face.
Background
In the prior art, two methods are generally adopted for stoping of a coal face in the well, namely: one-side double-roadway mining and one-side single-roadway mining of gob-side entry retaining of the section coal pillar are reserved. However, no matter which mining mode is adopted, once phenomena such as large-area roof fall or geological structure passing occur in the process of tunnel tunneling or after tunnel formation, great difficulty is brought to working face stoping.
As shown in FIG. 1, the mining mode of one surface double-lane of the reserved section coal pillar can directly bypass fault points such as roof fall, geological structure and the like by adopting the mode of constructing a bypass lane, and the correlation between the mining mode and an obstacle passing lane is not great when the mining mode is continued on a working surface, so that the production requirement can be basically met.
The single-lane mining mode of one side of the gob-side entry retaining can also adopt a mode of directly constructing a detour lane to carry out the gate crossing barrier, as shown in fig. 2, but the detour lane is difficult to retain, the entry retaining also needs to serve a continuous working surface, so that a great amount of lane repairing engineering is often caused, and the propelling speed of the working surface is influenced.
Disclosure of Invention
The invention aims to provide an obstacle-passing stoping method for a gob-side entry retaining coal face, which aims to solve the technical problems of difficult entry retaining of a detour roadway and slow stoping progress of the face in the prior art.
The invention provides a method for stoping a gob-side entry retaining coal face by passing through an obstacle, which comprises the steps of digging a detour roadway, digging an auxiliary cutting roadway and stoping,
the step of digging the detour roadway comprises the following steps: according to geological conditions of the obstacle point, front straight detours and rear straight detours which are perpendicular to the stoping direction and communicated with a roadway between two adjacent working surfaces are dug out respectively in front of and behind the obstacle point, side straight detours which are communicated with the front straight detours and the rear straight detours are dug out along the stoping direction between the front straight detours and the rear straight detours, and the front straight detours, the side straight detours and the rear straight detours form detours;
the step of digging out the auxiliary cutting roadway comprises the following steps: and digging an auxiliary cutting roadway which is perpendicular to the stoping direction and communicated with the roadway between two adjacent working surfaces on the same side of the detouring roadway, wherein the length of the auxiliary cutting roadway is consistent with the lengths of the front straight detouring roadway and the rear straight detouring roadway, and the auxiliary cutting roadway is used for realizing the detouring roadway retaining roadway when the current working surface is stoped.
Further, the step of mining the detour roadway according to the geological condition of the obstacle point comprises the following steps: and if the extending length of the barrier point towards the current working surface is smaller than or equal to the extending length towards the continuous working surface, the detour roadway and the auxiliary cutting roadway are dug out on the current working surface.
Further, the step of digging out the auxiliary cutting roadway includes: and if the detour roadway is dug out on the current working face, the auxiliary cut roadway is dug out in front of the front straight detour.
Further, when the distance between the obstacle point and the current stoping roadway is smaller than or equal to a first set distance, the current stoping roadway forms the back straight detour.
Further, the step of stoping includes:
narrowing the current working face by utilizing the back straight detour, widening the current working face by utilizing the auxiliary cutting roadway, stoping the current working face and realizing detour roadway entry retaining;
multiplexing the detour roadway, and stoping the continuous working surface and the periphery of the obstacle point.
Further, the step of mining the detour roadway according to the geological condition of the obstacle point comprises the following steps: and if the extending length of the barrier point towards the current working surface is larger than the extending length towards the continuous working surface, digging the detour roadway and the auxiliary cutting roadway on the continuous working surface.
Further, the step of digging out the auxiliary cutting roadway includes: and if the bypass roadway is dug out on the continuous working surface, the auxiliary cut roadway is dug out between the obstacle point and the rear straight bypass.
Further, when the distance between the obstacle point and the continuous stoping roadway is smaller than or equal to a second set distance, the continuous stoping roadway forms the back straight detour.
Further, when the distance between the obstacle point and the continuous stoping roadway is smaller than or equal to a third set distance, the continuous stoping roadway forms the auxiliary cut roadway, wherein the third set distance is smaller than the second set distance.
Further, the step of stoping includes:
the current working face is widened by utilizing the auxiliary cutting roadway, the current working face is narrowed by utilizing the front straight detour, the surroundings of the current working face and the obstacle point are stoped, and the detour roadway entry retaining is realized;
multiplexing the detour roadway to stope the continuous working face.
The method for stoping the gob-side entry retaining coal face through obstacle has the following beneficial effects:
according to the method for stoping the coal face of the gob-side entry retaining through the obstacle, the bypass roadway and the auxiliary cutting roadway are dug, so that the stoping can be smoothly carried out by only adjusting the pushing width of the working face when the working face is pushed and mined, and the roadway retaining of the bypass roadway is realized when the current working face is stoped. In addition, the front straight detour and the rear straight detour in the detour roadway and the auxiliary eye-cutting roadway are perpendicular to the stoping direction, the side straight detour in the detour roadway is parallel to the stoping direction, and the roadway between the detour roadway and two adjacent working surfaces (namely the roadway where the barrier point is located) forms a rectangular detour, so that the shape is regular, and the entry-retaining is very convenient. When the current working face is recovered, the current working face is narrowed by using a detour roadway, and is widened by using an auxiliary eye-cutting roadway; when stoping a continuous working face, the continuous working face is widened by using the detouring roadway, the continuous working face is narrowed by using the auxiliary cutting roadway, the number of times of width change of the working face is very small no matter the current working face is stoped or the continuous working face is stoped, stoping equipment such as a hydraulic support and the like with reduced width pushing can be directly stopped in the detouring roadway, and the stoping equipment which is required to be increased for widening pushing can be arranged in the auxiliary cutting roadway in advance when the stoping equipment is subsequently retracted or stoped for continuous working face, so that the method is very beneficial to ensuring the pushing speed of the working face. In addition, coal around the obstacle point can be extracted by adopting the method for stoping, and only smaller coal pillars between the detour roadway and the auxiliary cutting roadway are left, so that the loss rate of the coal pillars is lower, and the coal yield of a mining area is higher.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art one-face double-roadway coal face roadway obstruction method;
FIG. 2 is a schematic diagram of a prior art gob-side entry retaining coal face roadway obstacle passing method;
FIG. 3a is a schematic diagram of one of the methods for stoping a gob-side entry retaining coal face over-obstacle according to an embodiment of the present invention;
FIG. 3b is a schematic diagram II of one of the methods for stoping a coal face in a gob-side entry retaining according to an embodiment of the present invention;
FIG. 3c is a schematic diagram III of one of the methods for stoping a coal face over an obstacle in gob-side entry retaining according to an embodiment of the present invention;
FIG. 4a is a schematic diagram of a second method for stoping a coal face over an obstacle in gob-side entry retaining according to an embodiment of the present invention;
FIG. 4b is a schematic diagram II of a method for stoping a coal face of a gob-side entry retaining according to an embodiment of the present invention;
FIG. 4c is a schematic diagram III of a second method for stoping a coal face in a gob-side entry retaining according to an embodiment of the present invention;
FIG. 5a is a schematic diagram of a third method for stoping a coal face over an obstacle in gob-side entry retaining according to an embodiment of the present invention;
FIG. 5b is a schematic diagram II of a third method for stoping a coal face over an obstacle in gob-side entry retaining according to an embodiment of the present invention;
FIG. 5c is a third schematic diagram of a method for stoping a coal face over an obstacle in a gob-side entry retaining according to an embodiment of the present invention;
FIG. 6a is a schematic diagram of a method for stoping a gob-side entry retaining coal face over an obstacle according to an embodiment of the present invention;
FIG. 6b is a schematic diagram II of a method for stoping a coal face over an obstacle in a gob-side entry retaining according to an embodiment of the present invention;
FIG. 6c is a third schematic diagram of a method for stoping a coal face over an obstacle in a gob-side entry retaining according to an embodiment of the present invention.
Reference numerals illustrate:
100-current working face; 110-current stoping roadway;
200-connecting working surfaces; 210-continuing a stoping roadway;
300-obstacle points;
400-detouring the roadway; 410-front straight detour; 420-a back straight detour; 430-side straight detour;
500-auxiliary cutting roadway.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The present embodiment provides a method for stoping a gob-side entry retaining coal face by passing through an obstacle, as shown in fig. 3a to 6c, which includes a step of mining a detour roadway 400, a step of mining an auxiliary cut roadway 500, and a step of stoping,
the step of mining out the detour roadway 400 includes: according to the geological condition of the obstacle point 300, a front straight detour 410 and a rear straight detour 420 which are perpendicular to the stoping direction and communicated with a roadway between two adjacent working surfaces are respectively dug out in front of and behind the obstacle point 300, a side straight detour 430 which is communicated with the front straight detour 410 and the rear straight detour 420 is dug out in the stoping direction, and the front straight detour 410, the side straight detour 430 and the rear straight detour 420 form a detour roadway 400;
the step of mining the auxiliary cut roadway 500 includes: on the same side of the detour roadway 400, an auxiliary cut roadway 500 perpendicular to the stoping direction and communicating with the roadway between the adjacent two working surfaces is dug, the length of the auxiliary cut roadway 500 is identical to the lengths of the front straight detour 410 and the rear straight detour 420, and the auxiliary cut roadway 500 is used for realizing the detour roadway 400 entry when the current working surface 100 is stoped.
According to the method for stoping the gob-side entry retaining coal face through the obstacle, the bypass roadway 400 and the auxiliary cut-off roadway 500 are dug, so that stoping can be smoothly carried out by only adjusting the advancing width of the working face when the working face is pushed and mined, and the bypass roadway 400 is used for stoping the current working face 100. In addition, the front straight detour 410, the rear straight detour 420 and the auxiliary cut-hole roadway 500 in the detour roadway 400 are perpendicular to the stoping direction, the side straight detour 430 in the detour roadway 400 is parallel to the stoping direction, and the roadway between the detour roadway 400 and the two adjacent working surfaces (i.e. the roadway where the obstacle point 300 is located) forms a rectangular detour with regular shape, so that the entry retaining is very convenient. When the front working face 100 is recovered, the front working face 100 is narrowed by using the detour roadway 400, and the front working face 100 is widened by using the auxiliary cutting roadway 500; when the continuous working surface 200 is extracted, the continuous working surface 200 is widened by using the detouring roadway 400, the continuous working surface 200 is narrowed by using the auxiliary cut-off roadway 500, the number of the width change times of the working surface is very small no matter the current working surface 100 is extracted or the continuous working surface 200 is extracted, extraction equipment such as a hydraulic support and the like with reduced width and pushing can be directly stopped in the detouring roadway 400, and can be directly reused when the continuous working surface 200 is subsequently retracted or extracted, and extraction equipment with increased required for widening pushing can be arranged in the auxiliary cut-off roadway 500 in advance, so that the method is very beneficial to ensuring the pushing speed of the working surface. In addition, coal around the obstacle point 300 can be extracted by adopting the method, and only smaller coal pillars between the detour roadway 400 and the auxiliary cutting roadway 500 are left, so that the loss rate of the coal pillars is relatively low, and the coal yield of a mining area is relatively high.
Specifically, in this embodiment, the step of mining the detour roadway 400 according to the geological condition of the obstacle point 300 includes: if the extending length of the obstacle point 300 toward the current working surface 100 is equal to or less than the extending length toward the subsequent working surface 200, the detour roadway 400 and the auxiliary cut roadway 500 are dug out on the current working surface 100. By the arrangement, the problem of large repair workload caused by overlong length of the detouring roadway 400 can be effectively avoided. In addition to the extended length of the obstacle 300, the geological structure of the two working surfaces may be considered, and a side construction with high safety factor and easy construction may be selected.
Specifically, in this embodiment, as shown in fig. 3a to 3c, the step of mining the auxiliary cutting roadway 500 includes: if detour lane 400 is dug out on current face 100, auxiliary cut-hole lane 500 is dug out in front of front straight detour 410. So arranged, during the pushing and mining process of the current working face 100, after the roadway 400 is bypassed, the widening and pushing and mining can be realized in the auxiliary cutting roadway 500.
Specifically, in the present embodiment, as shown in fig. 4a to 4c, when the distance between the obstacle point 300 and the current stoping roadway 110 is less than or equal to the first set distance, the current stoping roadway 110 forms a back straight detour 420. More specifically, the first preset distance is a preset distance between the obstacle point 300 and the rear straight detour 420 when the obstacle point 300 is far from the current stope 110.
Specifically, in this embodiment, when the current working face 100 is provided with the detour roadway 400 and the auxiliary cut roadway 500, the stoping step includes: narrowing of the current working face 100 is achieved by utilizing the rear straight detour 420, widening of the current working face 100 is achieved by utilizing the auxiliary cutting roadway 500, stoping of the current working face 100 is achieved, and detour roadway 400 is achieved; the detouring roadway 400 is multiplexed, and the periphery of the continuous working surface 200 and the obstacle point 300 is recovered.
To sum up, if the detour roadway 400 and the auxiliary cut roadway 500 are arranged on the current working face 100, the steps of the obstacle-passing stoping method include:
(1) If the distance between the obstacle point 300 and the current stoping roadway 110 is far, a right frame-shaped detour roadway 400 is dug around the obstacle point 300; if the obstacle point 300 is close to the cut-off position, namely the current stoping roadway 110, an inverted L-shaped detour is dug around the obstacle point 300;
(2) Constructing an auxiliary cutting roadway 500;
(3) Widening stoping equipment such as a hydraulic bracket is arranged in the auxiliary cutting roadway 500 in advance, and the bypass roadway 400 and the auxiliary cutting roadway 500 are utilized to realize narrowing or widening smooth stoping of the current working surface 100 and the roadway retention of the bypass roadway 400 when the current working surface 100 stopes;
(4) In the stoping process of the continuous working face 200, the coal pillars surrounded by the partial detouring roadway 400 are recovered by the detouring roadway 400, so that the multiplexing of the remaining roadway and the pushing and the stoping of the continuous working face 200 are realized.
Specifically, in this embodiment, the step of mining the detour roadway 400 according to the geological condition of the obstacle point 300 further includes: if the extending length of the obstacle point 300 towards the current working surface 100 is greater than the extending length towards the continuous working surface 200, the detour roadway 400 and the auxiliary cutting roadway 500 are dug out on the continuous working surface 200. By the arrangement, the problem of large repair workload caused by overlong length of the detouring roadway 400 can be effectively avoided. In addition to the extended length of the obstacle 300, the geological structure of the two working surfaces may be considered, and a side construction with high safety factor and easy construction may be selected.
Specifically, in this embodiment, as shown in fig. 5a to 5c, the step of mining the auxiliary cutting roadway 500 includes: if detouring roadway 400 is excavated on continuous working surface 200, auxiliary cut roadway 500 is excavated between obstacle point 300 and rear straight detouring roadway 420. So arranged, in the process of pushing and picking the continuous working surface 200, after the rear straight detour 420, the widening and pushing and picking can be realized in the auxiliary cutting roadway 500.
Specifically, in the present embodiment, when the distance between the obstacle point 300 and the continuous stoping roadway 210 is less than or equal to the second set distance, the continuous stoping roadway 210 forms the back straight detour 420. More specifically, the second preset distance is a preset distance between the obstacle point 300 and the back straight detour 420 when the obstacle point 300 is far from the continuous stope roadway 210.
Specifically, in the present embodiment, as shown in fig. 6a to 6c, when the distance between the obstacle point 300 and the continuous mining roadway 210 is less than or equal to a third set distance, the continuous mining roadway 210 forms the auxiliary cut roadway 500, wherein the third set distance is less than the second set distance. More specifically, the third preset distance is a preset distance between the obstacle point 300 and the auxiliary cutting roadway 500 when the obstacle point 300 is far from the continuous stoping roadway 210.
Specifically, in this embodiment, when the bypass roadway 400 and the auxiliary cut roadway 500 are arranged in connection with the working face 200, the stoping step includes: the widening of the current working surface 100 is realized by using the auxiliary cutting roadway 500, the narrowing of the current working surface 100 is realized by using the front straight detour 410, the surroundings of the current working surface 100 and the obstacle point 300 are stoped, and the entry retaining of the detour roadway 400 is realized; the multiplex detour roadway 400 stopes the following working surface 200.
To sum up, if the detour roadway 400 and the auxiliary cut roadway 500 are arranged on the continuous working surface 200, the steps of the obstacle-passing stoping method include:
(1) If the distance between the obstacle point 300 and the current stoping roadway 110 is far, a left frame-shaped detour roadway 400 is dug around the obstacle point 300, and an auxiliary cut roadway 500 is constructed; if the obstacle point 300 is close to the cut-off position, namely, is connected with the stoping roadway 210, the L-shaped detours which are upwards and downwards inverted and leftwards and rightwards inverted and are dug around the obstacle point 300;
(2) Widening stoping equipment such as a hydraulic bracket is arranged in the auxiliary cutting roadway 500 in advance, and the bypass roadway 400 and the auxiliary cutting roadway 500 are utilized to realize narrowing or widening smooth stoping of the current working surface 100 and the roadway retention of the bypass roadway 400 when the current working surface 100 stopes;
(3) In the stoping process of the next working face of the continuous working face 200, the coal pillar surrounded by the bypass roadway 400 is recovered by the bypass roadway 400, so that the multiplexing of the remaining roadway and the pushing and the mining of the continuous working face 200 are realized.
In the actual pushing and mining process, the current working surface 100 is usually mined, and then the gate and the mining roadway of the continuous working surface 200 are arranged, so if the bypass roadway 400 is arranged on the continuous working surface 200, the cutting hole of the continuous working surface 200, that is, the continuous mining roadway 210, needs to be at least partially mined.
Finally, it is further noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The method for stoping the gob-side entry retaining coal face through the obstacle is characterized by comprising the steps of digging a detour roadway (400), digging an auxiliary cutting roadway (500) and stoping,
the step of digging the detour roadway (400) comprises the following steps: according to the geological condition of an obstacle point (300), a front straight detour (410) and a rear straight detour (420) which are perpendicular to the stoping direction and communicated with a roadway between two adjacent working surfaces are respectively dug out in front of and behind the obstacle point (300), a side straight detour (430) which is communicated with the front straight detour (410) and the rear straight detour (420) is dug out in the stoping direction, and the front straight detour (410), the side straight detour (430) and the rear straight detour (420) form the detour roadway (400);
the step of digging out the auxiliary cutting roadway (500) comprises the following steps: on the same side of the detouring roadway (400), an auxiliary cutting roadway (500) which is perpendicular to the stoping direction and is communicated with the roadway between two adjacent working surfaces is dug, the length of the auxiliary cutting roadway (500) is consistent with the lengths of the front straight detouring roadway (410) and the rear straight detouring roadway (420), and the auxiliary cutting roadway (500) is used for realizing the detouring roadway (400) in stoping of the current working surface (100);
-a step of mining said detour roadway (400) according to the geological condition of the obstacle point (300), comprising: if the extending length of the barrier point (300) towards the current working surface (100) is smaller than or equal to the extending length towards the continuous working surface (200), the bypass roadway (400) is dug out on the current working surface (100), and the auxiliary cut roadway (500) is dug out in front of the front straight bypass (410);
if the extending length of the barrier point (300) towards the current working surface (100) is larger than the extending length towards the continuous working surface (200), the bypass roadway (400) is dug out on the continuous working surface (200), and the auxiliary cut roadway (500) is dug out between the barrier point (300) and the rear straight bypass (420).
2. The method of stoping over an obstacle in a gob-side entry retaining coal face according to claim 1, wherein if the detour roadway (400) is dug out on the current face (100), the current detour roadway (110) forms the back straight detour (420) when the distance between the obstacle point (300) and the current detour roadway (110) is equal to or less than a first set distance.
3. The method of stoping a gob-side entry retaining coal face past obstacle in accordance with claim 2, wherein said step of stoping comprises:
narrowing of the current working face (100) is achieved by utilizing the rear straight detour (420), widening of the current working face (100) is achieved by utilizing the auxiliary eye-cutting roadway (500), stoping of the current working face (100) and achieving detour roadway (400) retaining;
multiplexing the detour roadway (400), and stoping the periphery of the continuous working surface (200) and the obstacle point (300).
4. The method of stoping over an obstacle in a gob-side entry retaining coal face according to claim 1, wherein if the detour roadway (400) is excavated on the continuous working face (200), the continuous detour roadway (210) forms the back straight detour (420) when the distance between the obstacle point (300) and the continuous detour roadway (210) is equal to or less than a second set distance.
5. The method of over-obstacle extraction of gob-side entry retaining coal face according to claim 4, wherein when the distance between the obstacle point (300) and the subsequent extraction roadway (210) is equal to or less than a third set distance, the subsequent extraction roadway (210) forms the auxiliary cut roadway (500), wherein the third set distance is less than the second set distance.
6. The method of stoping a gob-side entry retaining coal face past obstacle in accordance with claim 4 or 5, wherein said step of stoping comprises:
widening the current working surface (100) by using the auxiliary cutting roadway (500), narrowing the current working surface (100) by using the front straight detour (410), stoping the current working surface (100) and the periphery of the obstacle point (300), and realizing the detour roadway (400) for retaining a roadway;
-multiplexing said detour lanes (400) back to said successive work plane (200).
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