CN111594259B - Method for controlling gas emission in initial mining period of fully mechanized caving face and construction method thereof - Google Patents
Method for controlling gas emission in initial mining period of fully mechanized caving face and construction method thereof Download PDFInfo
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- CN111594259B CN111594259B CN202010463880.1A CN202010463880A CN111594259B CN 111594259 B CN111594259 B CN 111594259B CN 202010463880 A CN202010463880 A CN 202010463880A CN 111594259 B CN111594259 B CN 111594259B
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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
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
Abstract
The invention relates to a method for controlling gas emission in the initial mining period of a fully mechanized caving face and a construction method thereof, belonging to the technical field of gas extraction, wherein an inclined drill hole is adopted to communicate a high extraction roadway and a coal seam roof caving zone, the inclined drill hole is utilized to extract gas, and the determination of the inclined drill hole comprises the following steps: s1Determining the opening position of the inclined drilling hole: along the vertical direction, the distance between the upper part of the stope face and the coal seam roof is hk(ii) a Along the horizontal direction, the distance from the cutting lane of the working face is bkThe distance from the return airway to the working face is dk；S2Determining the final hole position of the inclined drilling hole: along the vertical direction, the distance between the coal seam roof and the inner part of the caving zone is hz(ii) a Along the horizontal direction, is positioned right above the upper corner of the return airway of the working face and has a distance b from the cutting lane of the working facez；S3Determining the diameter of the slant hole: and determining the diameter of the inclined drill hole according to the site construction condition and the gas extraction effect. The invention not only solves the problem that the gas in the initial mining stage of the working face is out of limit, but also reduces the engineering cost.
Description
Technical Field
The invention belongs to the technical field of gas extraction, and relates to a method for controlling gas emission in the initial mining period of a fully mechanized caving face and a construction method thereof, which are particularly suitable for high-gas and outburst mines with serious gas overrun in the initial mining period of the fully mechanized caving face.
Background
When a coal mine adopts a fully mechanized top coal caving coal mining method to mine a thick coal seam, a large amount of gas is released by overlying adjacent coal seams and mining fallen coal at the initial mining stage and is gushed into a mining space, so that accidents such as gas overrun are caused. The gas emission principle is that after stoping of a working face, the overlying strata moves and deforms and is damaged, gas in an upper adjacent layer is relieved, and according to the desorption and migration characteristics of the relieved gas, the overlying coal strata of the goaf can be divided into an caving zone, a fracture zone and a bending subsidence zone. In the initial mining period of the working face, along with the initial breakage of the old roof, a large amount of pressure relief gas of the adjacent layer can be gushed into the working face, so that the gas of the working face is over-limited.
At present, the method for controlling gas emission during the stoping period of the fully mechanized caving face mainly adopts the extraction of gas of an adjacent layer. The adjacent layer gas extraction technology mainly comprises a strike high extraction roadway extraction technology. In the initial mining period of the working face, because the overlying strata crack just begins to grow upwards, the high pumping roadway cannot pump the gas released by pressure relief of an adjacent layer before the overlying strata crack of the top plate after the coal seam is mined is communicated with the high pumping roadway, and the high pumping roadway has a very limited pumping effect. Therefore, the invention discloses a method for treating gas emission in the initial mining period of the fully mechanized caving face by constructing a pseudo-inclined rear high suction roadway in some mining areas. The tunneling method of the pseudo-inclined rear high suction roadway comprises the following steps: and (3) ascending a slope upwards at the return airway at the upper corner of the working face, cutting along the working face to form an opening of the return airway in the mountain side, ascending the slope along a certain angle (generally 40 degrees), and tunneling a small-section pseudo-inclined airway to be connected with the tail part of the heading high-suction airway, so that the gas on the near-distance adjacent layer on the working face is pumped out under the negative pressure action of the high-suction airway. However, the pseudo-inclined rear high-level drawing roadway has the following difficulties in construction: the general construction slope of tunnel is above 38, and the construction degree of difficulty is big, and factor of safety is low, and engineering cost is higher.
Disclosure of Invention
In view of the above, the present application aims to provide a method for controlling gas emission during the initial mining period of a fully mechanized caving face and a construction method thereof, so as to solve the problem of gas overrun caused by a large amount of gas flowing to a mining space during the initial mining period of a coal mine face and reduce the engineering cost.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for controlling gas emission in the initial mining period of a fully mechanized caving face adopts an inclined drilling hole to communicate a high drainage roadway and a coal seam roof caving zone, gas is extracted by utilizing the inclined drilling hole, and the determination of the inclined drilling hole comprises the following steps:
S1determining the opening position of the inclined drilling hole: along the vertical direction, the distance between the upper part of the stope face and the coal seam roof is hk(ii) a Along the horizontal direction, the distance from the cutting lane of the working face is bkThe distance from the return airway to the working face is dk；
S2Determining the final hole position of the inclined drilling hole: along the vertical direction, the distance between the coal seam roof and the inner part of the caving zone is hz(ii) a Along the horizontal direction, is positioned right above the upper corner of the return airway of the working face and has a distance b from the cutting lane of the working facez；
S3Determining the diameter of the slant hole: and determining the diameter of the inclined drill hole according to the site construction condition and the gas extraction effect.
Alternatively, h is determined according to the "O-ring" theoryk：
Wherein the content of the first and second substances,
hk-the opening position of the inclined drill hole is spaced from the top plate of the coal seam by a distance m;
sigma m-coal seam cumulative mining thickness, m.
Optionally, determining b according to the roof presplitting step and roof caving anglek：
bk＝L+hkcosα
Wherein: bk-distance, m, of the position of the opening of the inclined borehole from the cut lane;
l is the pre-splitting step pitch of the top plate, m;
alpha-top plate collapse angle, °.
Optionally, d is determined from coal seam thickness, coal seam dip and roof inclination caving anglek：
Wherein: dkDistance of the position of the opening of the inclined bore from the return airwayI, m;
m-coal seam thickness, m;
theta-coal bed dip angle, °;
beta-top plate tends to fall angle, deg..
Optionally, h is determined from the mining height and the average dip of the coal seamz：
hz＝h/(k-1)cosα
Wherein: h isz-distance, m, of the inclined borehole end hole position from the coal seam roof;
h-mining height, m;
k is the average breaking and swelling coefficient of the caving rock;
alpha-average dip angle of coal seam.
Optionally, the diameter of the angled bore is in the range 1000mm to 1500 mm.
Alternatively, bz is equal to the length of the upper corner deep into the gob.
The inclined drilling construction method applied to the method for controlling gas emission in the initial mining period of the fully mechanized caving face comprises the following steps of: and (4) tunneling the high pumping roadway to the hole opening position of the inclined drilling hole, constructing an underground chamber for inclined drilling hole drilling, and then drilling from the hole opening position of the inclined drilling hole to the final hole position by adopting a drilling machine.
Optionally, the slant hole is drilled with a raise boring machine.
Optionally, drilling the angled borehole with the drilling rig comprises the steps of: firstly, a small drill bit is adopted to construct a guide hole from the hole opening position of the inclined drilling hole to the final hole position of the inclined drilling hole, then the drill is lifted, and the large-diameter drill bit is replaced to expand the drill until the inclined drilling hole is formed.
The invention has the beneficial effects that:
1. according to the invention, the large-diameter drill hole is constructed to the upper corner coal seam roof through the high-suction roadway, and the high-concentration gas accumulated in the goaf fissure zone or the caving space is extracted, so that the channel of the gas in the upper adjacent layer, which gushes to the working surface, is cut off, the gas at the lower part of the goaf is guided, the gas in the goaf is reduced to gush to the working surface, and the gas treatment effect is improved.
2. Compared with the pseudo-inclined high-suction roadway constructed in the prior art, the construction amount of the high-suction roadway is reduced, the potential safety hazard problem of digging the pseudo-inclined high-suction roadway is avoided, the continuous and stable production of the underground coal mine is ensured, and the engineering cost is effectively reduced.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram illustrating the determination of the distance between a borehole and a return airway in accordance with the present invention;
FIG. 2 is a schematic plan view of a borehole;
fig. 3 is a schematic view of the vertical position of the borehole.
Reference numerals: the method comprises the following steps of inclined drilling 1, an air return roadway 2, a working face 3, a low pumping roadway 4, a high pumping roadway 5, a cutting roadway 6 and a chamber 7.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1-3, a method for controlling gas emission in the initial mining period of a fully mechanized caving face adopts a large-diameter inclined borehole 1 to communicate a high-level drainage roadway 5 with an edge zone where a coal seam roof initially falls, gas is extracted by using the inclined borehole 1, and the determination of the inclined borehole 1 comprises the following steps:
S1determining the opening position of the inclined drilling hole 1: along the vertical direction, the distance between the upper part of the stope face 3 and the coal seam roof is hk(ii) a In the horizontal direction, at a distance b from the cut lane 6 of the working facekD from the return airway 2 of the working facek；
S2Determining the final hole position of the slant hole 1: along the vertical direction, the distance between the coal seam roof and the inner part of the caving zone is hz(ii) a Along the horizontal direction, is positioned right above the upper corner of the return airway of the working face and has a distance b from the cutting lane 6 of the working facez；
S3Determining the diameter of the slant hole 1: and determining the diameter of the inclined drill hole according to the site construction condition and the gas extraction effect.
Specifically, the determination of the position and the aperture of the slant hole 1 includes the following steps:
1. hole opening position of large-diameter inclined drilling hole 1
According to experience, the appropriate layer position of the high pumping roadway 5 at the upper part of the coal seam is selected at the middle lower part of the crack zone and is generally arranged at the mining height 8-10 times of the upper part of the coal seam, and a hole is drilled in the direction of the coal seam in the chamber 7 in front of the high pumping roadway 5 above the coal seam through a large-diameter drill hole.
(1) Determining the distance h between the open hole position of the large-diameter inclined drilling hole 1 and the coal seam roofk
Therefore, the high-suction roadway position is firstly reduced to the position h from the fracture scattering belt edge to the coal seam roof when the coal seam is minedkThe distance of (c).
According to the theory of O-shaped ring, the height hkComprises the following steps:
wherein the content of the first and second substances,
hk-the position of the hole of the inclined drilling hole is up to the height of the coal seam roof, m;
sigma m-coal seam cumulative mining thickness, m.
(2) Determining the distance b between the large-diameter inclined drilling hole 1 and the working face cut lane 6k。
Due to the existence of the caving zone, the large-diameter inclined borehole 1 has a certain effective extraction range, and when the collapse of the rock is pushed to a certain distance away from the borehole along with the advance of the mining surface, the borehole can generate extraction. The distance between the large-diameter drill hole and the cutting lane 6 is determined by the influence of the initial pressure of the top plate and the caving form of the top plate in the goaf.
Although the final hole position of the extraction drill hole is positioned within the broken surface of the top plate, namely the final hole position is positioned in the coal wall support influence area, due to the action of the bearing pressure of the working surface 3, a rock layer in the limit balance area of the bearing pressure is in a plastic state, micro cracks of the rock layer are relatively developed, and the drill hole can extract high-concentration gas; but the gas accumulated in the caving rock layer of the goaf is not fully extracted at the moment, and the problem of the gas at the upper corner of the working face cannot be effectively solved. Thus, the distance of the large diameter bore from the cutting lane 6bkCan be calculated as:
bk＝L+hkcosα
wherein: bkDistance, m, of the position of the opening of the inclined borehole from the cutting lane 6;
l is the pre-splitting step distance of the top plate, m, generally selected according to the lithology of the top plate;
α -top plate collapse angle, °;
(3) determining the distance d between the large-diameter inclined drilling hole 1 and the working face return airway 2k。
According to the theory of the O-ring of the mining crack, the maximum distance between the inclined effective control range of the large-diameter drilling hole and the air way is 1/3 of the length of the working face 3. On the other hand, the top plate of the working face also has a caving angle beta in the inclination direction, the caving angle beta is approximately consistent with the caving angle of the top plate of the working face 3, and the drift distance d between the large-diameter drill hole and the air way is considered according to the inclination angle and the thickness of the coal bedkThe determination method of (3) is as follows.
Wherein: dk-distance, m, of the position of the opening of the inclined borehole from the return airway 2;
m-coal seam thickness, m;
theta-coal bed dip angle, °;
beta-roof inclination fall angle, °;
2. final hole position of large diameter inclined drill hole 1
(1) Determining the distance h between the final hole position of the large-diameter inclined drilling hole and the coal seam roofz
When the fully mechanized mining face 3 is mined, the direct roof collapses firstly, the old roof is still in a compact state at the moment, and the crack cannot reach upwards, so that the terminal of the large-diameter drill hole extends into the caving zone of the coal seam roof at the moment. So the height of the caving zone, namely the distance h between the final hole position of the large-diameter inclined drilling hole and the coal seam roofzCalculated using the formula:
hz＝h/(k-1)cosα
wherein: h iszThe distance m between the final hole position of the inclined drilling hole and the coal seam roof;
h is the mining height m;
k is the average breaking and swelling coefficient of the falling rocks;
and alpha is the average dip angle of the coal bed.
(2) Determining the distance b between the final hole position of the large-diameter inclined drilling hole and the working face cutting lane 6 and the return airway 2zAnd dz
In the initial mining stage, the high-suction roadway 5 cannot play a role in gas extraction, and with the working propulsion, the upper corner gas can be extracted through the large-diameter drill hole before the top plate collapses. The final point of the large diameter angled bore 1 is located above the return air upper corner of the working face. According to experience, under the condition that the direct roof is continuously collapsed, the upper corner penetrates into the goaf about 10m, and the distance b from the final hole position of the large-diameter inclined drilling hole to the rear part of the working face cut lane 6 is determinedzThe final hole position of the large-diameter inclined drilling hole coincides with the return airway 2, which is 10 m.
3. Borehole diameter determination
The diameter of the drill hole is generally between 1000mm and 1500mm according to the field condition, and the drill hole is determined according to the gas extraction effect.
The inclined drilling construction method applied to the method for controlling gas emission in the initial mining period of the fully mechanized caving face comprises the following steps of constructing the inclined drilling 1 to the top corner coal seam roof through the high suction roadway 5: and (3) tunneling the high pumping roadway 5 to the hole opening position of the inclined drilling hole, constructing an underground chamber 7 for inclined drilling hole drilling, and drilling from the hole opening position of the inclined drilling hole to the final hole position by using a raise boring machine.
Preferably, drilling the angled borehole 1 with the drilling machine comprises the steps of: firstly, a small drill bit is adopted to construct a guide hole from the hole opening position of the inclined drilling hole 1 to the final hole position of the inclined drilling hole 1, then the drill is lifted, and the large-diameter drill bit is replaced to expand the drill until the inclined drilling hole 1 is formed.
Specifically, the construction method of the inclined drilling hole 1 comprises the steps of tunneling a high suction roadway 5 to the position close to the hole opening position of the large-diameter inclined drilling hole 1, constructing a chamber 7 for large-diameter drilling, pouring a drilling machine in the chamber 7 to arrange a foundation platform, wherein the foundation platform needs to be straight, arranging the drilling machine on the foundation platform and is stable, constructing a guide hole from top to bottom by adopting a small drill bit, lifting and replacing a large-diameter drill bit (the diameter of the drill bit is generally 1 m-1.4 m and is determined according to coal bed condition requirements) after the guide hole is constructed to a drilling end point, starting reaming and drilling according to the guide hole, and continuing reaming and drilling when the drilling machine with the large-diameter drill bit is constructed to the drilling end point, and repeating the steps until the large-diameter inclined drilling hole 1 is formed.
Example (b):
the effect of gas treatment by the large-diameter inclined drill hole in the initial mining period of a certain mining working face 3 is considered as follows:
(1) 7 position of large-diameter inclined drilling chamber for construction in high-suction roadway 5
And after the working face 3 moves to the high suction roadway 5 and starts downhill construction for 120m away from 200m of the working face cut roadway, horizontal construction for 15m reaches the large-diameter inclined drilling construction position on the side of the return airway of the working face, the chamber is expanded, and the drilling hole opening position is calibrated.
(2) Large diameter inclined drilling construction
Constructing a large-diameter inclined drilling hole 1 towards a coal seam by opening a hole in a high-suction roadway chamber 7, wherein the height of the hole from a coal seam top plate is 42m, the distance from the hole to a working face air return roadway 2 is 50m, the distance from the hole to a working face roadway cutting is 45m, firstly constructing a first guide hole, and the diameter of the guide hole is
The drilling final hole point is 8m above the coal seam roof. And after the construction is finished, replacing a large drill bit with the diameter of 1.4m for reaming construction.
And performing coal seam mining operation after the large-diameter drilling construction is completed. And starting the extraction work of the high extraction roadway 5 and the low extraction roadway 4 while stoping the coal seam. The upper corner gas concentration of the working face 3 in the initial mining period is less than 0.6%, and the phenomenon of gas overrun does not occur, which indicates that the method for treating gas emission in the initial mining period of the fully mechanized caving face 3 by adopting large-diameter drill holes instead of pseudo-inclined high-suction roadway gas extraction is feasible.
According to the invention, the large-diameter inclined borehole 1 is used for extracting gas, the working face 3 is close to return air, the borehole is constructed from the top to the coal seam roof from the side close to the goaf, high-concentration gas accumulated in a crack zone or a caving space of the goaf is extracted, a channel of the gas of the upper adjacent layer which gushes to the working face is cut off, meanwhile, the gas at the lower part of the goaf is drained, and the gas of the goaf is reduced from gushing to the working face.
The method is applied to gas control in the initial mining stage of the working face 3, and the high-pressure drainage roadway 5 is used for constructing the large-diameter drill hole to the upper corner coal seam roof to replace a pseudo-inclined high-pressure drainage roadway after construction, so that the gas extraction effect is improved. The gas emission in the initial mining period of the fully mechanized caving face 3 is treated by adopting the large-diameter drill holes instead of the roadways, namely, the gas emission in the initial mining period of the working face 3 is treated by constructing the large-diameter drill holes, the high-pressure extraction roadway 5 does not play a role in extraction in the initial mining period, and the gas in the goaf and the gas at the upper corner are extracted from the cracks of the coal seam roof, so that the gas flow field in the goaf is changed. Therefore, the construction quantity of the high-pressure drainage tunnel 5 is obviously reduced, and the problem of gas emission in the initial mining stage of the working face 3 is solved, so that the hidden danger problem of excavating a pseudo-inclined high-pressure drainage tunnel is solved, the engineering cost is effectively reduced, and the continuous and stable production in the underground coal mine is ensured.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (4)
1. A method for controlling gas emission in the initial mining period of a fully mechanized caving face is characterized in that an inclined drill hole is adopted to communicate a high drainage roadway and a coal seam roof caving zone, gas is extracted by utilizing the inclined drill hole, and the determination of the inclined drill hole comprises the following steps:
S1determining the opening position of the inclined drilling hole: along the vertical direction, is positioned above a stope face and is away from the coal seam roof by a distance hk(ii) a Along the horizontal direction, the distance from the cutting lane of the working face is bkAt a distance of the return airway from the working face ofdk；
According to the theory of an O-shaped ring, h is determinedk：
Wherein the content of the first and second substances,
hk-the opening position of the inclined borehole is at a distance, m, from the coal seam roof;
sigma m-the cumulative mining thickness of the coal seam, m;
b is determined according to the presplitting step pitch and the caving angle of the top platek：
bk＝L+hkcosα
Wherein: bk-distance of the position of the opening of the inclined borehole from the cut lane, m;
l-roof presplitting step, m;
alpha-top plate collapse angle, °;
determining d according to the thickness of the coal seam, the inclination angle of the coal seam and the caving angle of the roofk：
Wherein: dk-the distance, m, of the position of the opening of the inclined borehole from the return airway;
m-coal seam thickness, m;
theta-coal bed dip angle, °;
beta-top plate inclination fall angle, °;
S2determining the final hole position of the inclined drilling hole: along the vertical direction, is positioned in the caving zone and has a distance h from the top plate of the coal bedz(ii) a Along the horizontal direction, is positioned right above the upper corner of the return airway of the working face and has a distance b from the cutting lane of the working facezBz is equal to the length of the upper corner penetrating into the gob;
h is determined according to the mining height and the average dip angle of the coal bedz：
hz＝h/(k-1)cosα
Wherein: h isz-tiltingThe distance, m, between the final hole position of the inclined drilling hole and the coal seam roof;
h-mining height, m;
k-average breaking and swelling coefficient of the caving rock;
alpha-average dip angle of the coal bed;
S3determining the diameter of the slant hole: and determining the diameter of the inclined drill hole according to the site construction conditions and the gas extraction effect, wherein the diameter range of the inclined drill hole is 1000-1500 mm.
2. The inclined drilling construction method applied to the method for treating gas emission in the initial mining period of the fully mechanized caving face according to claim 1, wherein the inclined drilling is constructed to the upper corner coal seam roof through a high drawing roadway, and the method comprises the following steps: and (4) tunneling the high pumping roadway to the hole opening position of the inclined drilling hole, constructing an underground chamber for inclined drilling hole drilling, and then drilling from the hole opening position of the inclined drilling hole to the final hole position by adopting a drilling machine.
3. The drilling construction method according to claim 2, wherein: and (5) drilling an inclined borehole by using a raise boring machine.
4. The drilling construction method according to claim 2, wherein drilling the slant hole with the drilling machine comprises the steps of: firstly, a small drill bit is adopted to construct a guide hole from the hole opening position of the inclined drilling hole to the final hole position of the inclined drilling hole, then the drill is lifted, and the large-diameter drill bit is replaced to expand the drill until the inclined drilling hole is formed.
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| CN113586134A (en) * | 2021-09-08 | 2021-11-02 | 晋能控股山西科学技术研究院有限公司 | Method for treating gas by hole-lane-replacement combined drainage on coal seam working face |
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