CN110821550A - Coal roadway gas drainage method - Google Patents
Coal roadway gas drainage method Download PDFInfo
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- CN110821550A CN110821550A CN201910953570.5A CN201910953570A CN110821550A CN 110821550 A CN110821550 A CN 110821550A CN 201910953570 A CN201910953570 A CN 201910953570A CN 110821550 A CN110821550 A CN 110821550A
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
Abstract
The embodiment of the invention discloses a coal roadway gas drainage method, and relates to the technical field of coal roadway tunneling. The method comprises the following steps: drilling a plurality of blind holes in the heading working face of the coal roadway to be tunneled towards the tunneling direction of the coal roadway; cleaning residues in the blind holes, and prefabricating rock mass crushing slurry; injecting the prefabricated rock mass crushing slurry into the blind holes by using grouting equipment; standing for a preset time, solidifying and expanding the static crushing slurry, applying pressure to the hole wall, and changing the internal stress of the coal rock where the coal roadway to be tunneled under the action of the pressure to enlarge the internal cracks of the coal rock; the gas overflows outwards along the enlarged crack so as to realize gas drainage. The pumping and discharging mode is simple, and the problem of equipment failure hardly exists in the pumping and discharging process, so that the pumping and discharging efficiency can be improved. The invention is suitable for underground tunneling engineering with gas.
Description
Technical Field
The invention relates to the technical field of coal roadway tunneling, in particular to a coal roadway gas drainage method.
Background
In the coal roadway tunneling, if the gas concentration in the coal rock of the coal roadway to be tunneled is too high, gas drainage is required firstly, and then the coal roadway tunneling is carried out, and the gas drainage efficiency directly restricts the tunneling speed of the roadway.
At present, gas drainage generally utilizes a downward drilling mode, various complex pipelines and equipment are arranged in a drill hole for drainage, and due to the fact that the complex pipelines and equipment are involved, once a fault occurs, the gas drainage efficiency can be affected, and the drainage mode is complex.
Disclosure of Invention
In view of this, the embodiment of the invention provides a coal roadway gas drainage method, which is simple in drainage mode, and has almost no problem of equipment failure in the drainage process, so that the drainage efficiency can be improved.
The coal roadway gas drainage method provided by the embodiment of the invention comprises the following steps:
drilling a plurality of blind holes in the heading working face of the coal roadway to be tunneled towards the tunneling direction of the coal roadway;
cleaning residues in the blind holes, and prefabricating rock mass crushing slurry;
injecting the prefabricated rock mass crushing slurry into the blind holes by using grouting equipment;
standing for a preset time, solidifying and expanding the static crushing slurry, applying pressure to the hole wall, and changing the internal stress of the coal rock where the coal roadway to be tunneled under the action of the pressure to enlarge the internal cracks of the coal rock;
the gas overflows outwards along the enlarged crack so as to realize gas drainage.
Preferably, the prefabricated rock mass fracturing slurry comprises:
determining the tunneling depth and the tunneling working face area of a coal roadway to be tunneled according to a construction design drawing;
calculating the volume of the coal road to be tunneled based on the determined tunneling depth of the coal road to be tunneled and the area of the tunneling working face;
determining the using amount of a static expanding agent according to the volume of the coal road to be tunneled;
and pouring the static expanding agent and water into a mixer according to the proportion of 1/4-1/3, and uniformly mixing to form rock mass crushing slurry.
Preferably, the grouting equipment comprises a grouting pump and a grouting pipeline assembly, the grouting pipeline assembly comprises a grouting pipeline and a grout stopping plug, a through hole is formed in the middle of the grout stopping plug, and the grout stopping plug is sleeved on the grouting pipeline through the through hole;
utilize grouting equipment to pour into the broken thick liquid of prefabricated rock mass into the blind hole including: the grouting pump is allocated to a construction site, and the suction end of the grouting pump is connected into the mixer;
connecting the output end of a grouting pump with one end of a grouting pipeline, inserting the other end of the grouting pipeline into the blind hole, and plugging the orifice by using a grout stopping plug;
and adjusting grouting parameters of a grouting pump, starting the grouting pump, pumping out rock mass crushing slurry in the mixer, and injecting the rock mass crushing slurry into the blind hole through a grouting pipeline.
Preferably, a cable channel is reserved between the inner wall and the outer wall of the grouting pipeline; the grouting pipeline assembly further comprises a waterproof vibrator, the diameter of the waterproof vibrator is smaller than the aperture of the blind hole, the waterproof vibrator is arranged at the other end of the grouting pipeline, and a waterproof cable of the waterproof vibrator is led out from the cable channel.
Preferably, the static swelling agent comprises a calcium oxide component;
the method further comprises the following steps: mixing a static expanding agent and water according to the proportion and then directly injecting the mixture into the blind hole;
in the mixing process, calcium oxide in the static expanding agent and water are subjected to chemical reaction to release certain heat;
under the action of heat, the gas in the adsorption state is resolved into a free state;
when the formed static crushing slurry is solidified and expanded, pressure is applied to the hole wall, under the action of the pressure, the internal stress of the coal rock where the coal roadway to be tunneled is located changes, and when the internal crack of the coal rock becomes large, the gas in a free state overflows outwards along the large crack, so that gas drainage is realized. .
Preferably, the method further comprises: burying a plurality of gas concentration detectors at intervals along the tunneling direction in a rock mass of a coal roadway to be tunneled;
the gas still includes along the fracture that enlarges outwards overflowing to realize after the gas drainage:
determining whether the current gas concentration meets a safety specified value or not according to the current gas concentration detected by the gas concentration detector;
if so, tunneling the coal road to be tunneled according to the tunneling design requirement;
if not, increasing the number of the blind holes, repeating the step of realizing gas drainage to continuously drain the gas, and monitoring the real-time gas concentration value detected by the gas concentration detector;
and if the detected gas concentration value meets a safety specified value, stopping drainage, and beginning to tunnel the coal roadway to be tunneled according to the tunneling design requirement.
Preferably, drilling a plurality of blind holes in the coal roadway heading face to the coal roadway heading direction on the coal roadway heading face to be tunneled includes:
determining the distribution quantity of the blind holes according to the tunneling depth of the coal roadway to be tunneled;
selecting a corresponding drilling area at a position above the central line of the head-on working face of the coal roadway to be tunneled according to the determined layout number of the blind holes; the distance between adjacent drilling areas is 10-40 cm;
stopping the drilling equipment in front of the head-on working face of the coal roadway to be tunneled, and enabling the drill bit to be aligned to the selected first drilling area;
simultaneously or sequentially drilling a first blind hole, a second blind hole and a third blind hole in the first drilling area in an inclined downward manner towards the tunneling direction, wherein the Nth blind hole is arranged at the position of a horizontal line at the bottom of the roadway to be tunneled; n is greater than 0 and is an integer;
and repeating the drilling step of the first area to finish the drilling construction of all the drilling areas.
Preferably, the first blind hole, the second blind hole and the third blind hole are drilled obliquely downwards in the first drilling area towards the tunneling direction simultaneously or sequentially, the horizontal line position from the Nth blind hole to the bottom of the roadway to be tunneled comprises:
and adjusting the drilling angle, the diameter and the drilling speed of the drill bit according to the geological environment of each drilling hole in the first drilling area penetrating through the rock stratum.
Preferably, the number of the drilling areas is 10-15, and the aperture of the blind hole is 32-50 mm.
Preferably, the cleaning the residue in the blind hole comprises: the output pipeline of the air pressure system in the mine is connected with an air pipe assembly; the air pipe assembly comprises an air pipe and a valve arranged on the air pipe;
inserting the air pipe into the bottom of the blind hole, starting a wind pressure system, and opening the valve;
the air flow enters the bottom of the blind hole through the air pipe and blows the residues in the hole out of the hole.
According to the coal roadway gas drainage method provided by the embodiment of the invention, a plurality of blind holes are drilled in the coal roadway heading direction on the working face of the coal roadway to be tunneled; cleaning residues in the blind holes, and prefabricating rock mass crushing slurry; injecting the prefabricated rock mass crushing slurry into the blind holes by using grouting equipment; standing for a preset time, solidifying and expanding the static crushing slurry, applying pressure to the hole wall, and changing the internal stress of the coal rock where the coal roadway to be tunneled under the action of the pressure to enlarge the internal cracks of the coal rock; the gas overflows outwards along the enlarged crack so as to realize the gas drainage on the extending platform at the rear end of the machine base. The whole process of realizing gas drainage does not relate to the setting of complex pipelines and drainage equipment, so the drainage mode is simple, and the problem of equipment failure does not exist in the drainage process basically, thereby improving the drainage efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a coal roadway gas drainage method according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a drilling area in a gas drainage method for a coal roadway according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a layout structure of a plurality of drilling areas in the coal roadway gas drainage method according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be apparent that numerous technical details are set forth in the following specific examples in order to provide a more thorough description of the present invention, and it should be apparent to one skilled in the art that the present invention may be practiced without some of these details. In addition, some methods, means, components and applications thereof known to those skilled in the art are not described in detail in order to highlight the gist of the present invention, but the implementation of the present invention is not affected thereby. The embodiments described herein are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 3, the coal roadway gas drainage method provided by the embodiment of the invention is suitable for underground tunneling engineering in which gas exists, for example, tunneling engineering of a coal roadway. The coal roadway gas drainage method comprises the following steps:
and S101, drilling a plurality of blind holes in the heading working face 1 of the coal roadway 2 to be tunneled towards the tunneling direction of the coal roadway.
Before the blind holes are drilled, the gas concentrations of different tunneling sections of coal rock where a coal roadway is to be tunneled can be detected, and the number of the drilled blind holes and the arrangement of drilled areas are determined according to the detected gas concentration values.
And S102, cleaning residues in the blind holes, and prefabricating rock mass crushing slurry.
The residues in the drill hole generally comprise coal rock fragments and residual water, and the specific cleaning method can be as follows: the output pipeline of the air pressure system in the mine is connected with an air pipe assembly; the air pipe assembly comprises an air pipe and a valve arranged on the air pipe; inserting the air pipe into the bottom of the blind hole, starting a wind pressure system, and opening the valve; the air flow enters the bottom of the blind hole through the air pipe and blows the residues in the hole out of the hole. The air pressure system in the mine is utilized, the air pipe assembly is connected to the output pipeline, one end of the air pipe is inserted into the bottom of the blind hole, high-pressure air flow is conveyed to the blind hole, and residues in the drilled hole can be cleaned conveniently.
Wherein, broken thick liquid of prefabricated rock mass includes: determining the tunneling depth and the tunneling working face area of a coal roadway to be tunneled according to a construction design drawing; calculating the volume of the coal road to be tunneled based on the determined tunneling depth of the coal road to be tunneled and the area of the tunneling working face; determining the using amount of a static expanding agent according to the volume of the coal road to be tunneled; and pouring the static expanding agent and water into a mixer according to the proportion of 1/4-1/3, and uniformly mixing to form rock mass crushing slurry.
The static expanding agent is also called a static crushing agent, and the static crushing is relative to the traditional explosive blasting mode; is a gray powdery material with high expansion performance and made of various inorganic substances. There are three main types depending on the application to different ambient temperatures: HSCA-1(25 ℃ -40 ℃), HSCA-2(10 ℃ -25 ℃), HSCA-3(-5 ℃ -10 ℃), and can be purchased in the market. The amount of static swelling agent used was about: 1.8 grams per cubic centimeter, for example, about 1.8 kilograms for a 36mm diameter hole with a 1 cubic meter drill bit.
Particularly, when the slurry of the prefabricated rock mass is broken, the following materials are prepared: 1) static swelling agent, 2) clean water, 3) a water bucket, 4) a mixer, 5) protective glasses, 6) rubber gloves, and 7) clean water and towels for standby.
Wherein the static expanding agent and water are mixed according to the mixture ratio of 1/4-1/3, and the specific mixture ratio is as follows: the weight of the water is about 25-30% of that of the static expanding agent, for example, 10 kg of the crushing agent is mixed with 2.5-3 kg of water.
And S103, injecting the prefabricated rock mass crushing slurry into the blind hole by using grouting equipment.
Specifically, grouting equipment includes grouting pump and grouting pipe assembly, grouting pipe assembly includes grouting pipe and only fills in, only be equipped with the through-hole in the middle of filling in, only fill in and pass through the through-hole overlaps on grouting pipe.
Utilize grouting equipment to pour into the broken thick liquid of prefabricated rock mass into the blind hole including: and (4) allocating the grouting pump to a construction site, and connecting the suction end of the grouting pump into the mixer.
Wherein, the blender can be the mixer, exports the thick liquid that the stirring is good to storing up the thick liquid pond with the mixer, locates the suction end of grouting pump in the thick liquid pond to the broken thick liquid of prefabricated rock mass of extraction.
And connecting the output end of the grouting pump with one end of the grouting pipeline, inserting the other end of the grouting pipeline into the blind hole, and plugging the orifice with a grout stop plug to prevent grout from overflowing in the grouting process.
And adjusting grouting parameters of a grouting pump, starting the grouting pump, pumping out rock mass crushing slurry in the mixer, and injecting the rock mass crushing slurry into the blind hole through a grouting pipeline.
The grouting parameters comprise grouting speed, and the grouting speed needs to be controlled in the grouting process and is slow at the beginning so as to prevent bubbles from being generated and influence the effect of the solidified grouting.
And S104, standing for a preset time, solidifying and expanding the static crushing slurry, applying pressure to the hole wall, and changing the internal stress of the coal rock where the coal roadway to be tunneled under the action of the pressure to enlarge the internal cracks of the coal rock.
The preset time is 6-12 hours, and preferably 8 hours; in the time period, the operations of overhauling large mechanical equipment in the roadway, forepoling of the roadway and the like can be arranged.
Generally, the crushed rock mass such as coal rock belongs to a brittle material, the compressive strength of the brittle material is large, the tensile strength is small, and the tensile strength is far smaller than the compressive strength (the tensile strength of the rock is 1.96-30Mpa, which is about 1/10-1/20 of the compressive strength, and the pressure of the rock mass crushing slurry after expansion can reach 100-123 Mpa, so that under the action of the expansion pressure of the rock mass crushing slurry, the internal stress of the rock mass changes, the rock mass is cracked, and the internal cracks of the rock mass can be enlarged.
And S105, the gas overflows outwards along the enlarged crack to realize gas drainage.
After the crack of the inside coal petrography grow, gas will spill over along with the crack of grow is outside automatic, need not set up complicated drainage pipeline and equipment, just can realize the automatic emission of gas, and the drainage mode is simple, and there is not equipment trouble problem at the drainage in-process moreover to can improve drainage efficiency.
According to the coal roadway gas drainage method provided by the embodiment of the invention, a plurality of blind holes are drilled in the coal roadway heading direction on the working face of the coal roadway to be tunneled; cleaning residues in the blind holes, and prefabricating rock mass crushing slurry; injecting the prefabricated rock mass crushing slurry into the blind holes by using grouting equipment; standing for a preset time, solidifying and expanding the static crushing slurry, applying pressure to the hole wall, and changing the internal stress of the coal rock where the coal roadway to be tunneled under the action of the pressure to enlarge the internal cracks of the coal rock; the gas overflows outwards along the enlarged crack so as to realize the gas drainage on the extending platform at the rear end of the machine base. The whole process of realizing gas drainage does not relate to the setting of complex pipelines and drainage equipment, so the drainage mode is simple, and the problem of equipment failure does not exist in the drainage process basically, thereby improving the drainage efficiency.
In another embodiment of the invention, the static swelling agent comprises a calcium oxide component; the method further comprises the following steps: mixing a static expanding agent and water according to the proportion and then directly injecting the mixture into the blind hole; in the mixing process, calcium oxide in the static expanding agent and water are subjected to chemical reaction to release certain heat; the adsorbed gas is resolved into a free state by the heat.
It can be understood that calcium oxide and water react chemically to generate calcium hydroxide, a large amount of heat is released, and gas molecules become active under the action of the heat, so that adsorbed gas is changed into free gas, and the overflow of the gas is accelerated when coal rocks have cracks.
When the formed static crushing slurry is solidified and expanded, pressure is applied to the hole wall, under the action of the pressure, the internal stress of the coal rock where the coal roadway to be tunneled is located changes, and when the internal crack of the coal rock becomes large, the gas in a free state overflows outwards along the large crack, so that gas drainage is realized.
In one embodiment of the invention, a cable channel is reserved between the inner wall and the outer wall of the grouting pipeline;
the grouting pipeline assembly further comprises a waterproof vibrator, the waterproof vibrator can prevent moisture in slurry from entering the interior of the waterproof vibrator, the diameter of the waterproof vibrator is smaller than the aperture of the blind hole, the waterproof vibrator is arranged at the other end of the grouting pipeline, and a waterproof cable of the waterproof vibrator is led out of the cable channel.
In the embodiment, the waterproof vibrator is arranged at the end part of the grouting pipeline, the leading-out end of the waterproof cable of the waterproof vibrator is connected with the power supply in or after the grouting process, the waterproof vibrator is started to vibrate the grout in the hole according to a certain frequency so as to ensure the grouting effect,
in another embodiment of the invention, a plurality of gas concentration detectors are embedded in the rock mass of the coal roadway to be tunneled at intervals along the tunneling direction.
The gas still includes along the fracture that enlarges outwards overflowing to realize after the gas drainage: determining whether the current gas concentration meets a safety specified value or not according to the current gas concentration detected by the gas concentration detector; wherein, the gas concentration is more than or equal to 1.0 percent, namely exceeds the standard, namely the safety specified value is less than 1.0 percent; if so, tunneling the coal road to be tunneled according to the tunneling design requirement; if not, increasing the number of the blind holes, repeating the step of realizing gas drainage to continuously drain the gas, and monitoring the real-time gas concentration value detected by the gas concentration detector; and if the detected gas concentration value meets a safety specified value, stopping drainage, and beginning to tunnel the coal roadway to be tunneled according to the tunneling design requirement.
It will be appreciated that the smaller the hole spacing, i.e. the greater the number of blind holes, the shorter the cracking time of the surrounding rock mass after the rock mass fracturing slurry is injected into the blind holes and expanded.
In another embodiment, the aperture of the blind hole is enlarged if the current gas concentration is determined not to meet the safety specified value; repeating the step of realizing gas drainage to continuously drain gas, and monitoring the real-time gas concentration value detected by the gas concentration detector; and if the detected gas concentration value meets a safety specified value, stopping drainage, and beginning to tunnel the coal roadway to be tunneled according to the tunneling design requirement. A
The larger the aperture is, the larger the expansion pressure generated after rock mass crushing slurry is injected into the blind hole for expansion, and the shorter the cracking time of the surrounding rock mass.
Preferably, when the ambient temperature is above 35 degrees, it is recommended to drill a hole with a drill bit between 32 and 36mm to reduce the possibility of the rock breaking slurry jet holes.
In another embodiment, the drilling a plurality of blind holes in the heading face of the coal roadway to be tunneled toward the tunneling direction of the coal roadway comprises:
determining the distribution quantity of the blind holes according to the tunneling depth of the coal roadway to be tunneled; selecting a corresponding drilling area at a position above the central line of the head-on working face of the coal roadway to be tunneled according to the determined layout number of the blind holes; wherein, referring to fig. 3, 1, 2 and 3 in fig. 3 indicate the numbers of the drilling areas; the distance between adjacent drilling areas is 10-40 cm; and stopping the drilling equipment in front of the head-on working face of the coal roadway to be tunneled, and aligning the drill bit to the selected first drilling area.
Simultaneously or sequentially drilling a first blind hole, a second blind hole and a third blind hole in the first drilling area in an inclined downward manner towards the tunneling direction, wherein the Nth blind hole is arranged at the position of a horizontal line at the bottom of the roadway to be tunneled; n is greater than 0 and is an integer; and repeating the drilling step of the first area to finish the drilling construction of all the drilling areas.
Referring to FIG. 2, a drilling area may be drilled with a plurality of holes from a starting point obliquely downward at an angle θ to the horizontal, e.g., at an angle θ to the horizontal1、θ2、θ3And theta4The length l of the drilled hole is h/sin theta, wherein h is the height from the drilling starting point to the bottom of the coal roadway, and the unit is cm, and can also be m; or a plurality of holes can be drilled from top to bottom from different starting points obliquely downwards at different angles from the horizontal angle.
Specifically, simultaneously or in proper order in first drilling region down bore first blind hole, second blind hole, third blind hole towards the direction of tunnelling the inclined.
And adjusting the drilling angle, the diameter and the drilling speed of the drill bit according to the geological environment of each drilling hole in the first drilling area penetrating through the rock stratum. Corresponding drilling parameters can be selected according to the geological environment, rock stratum drilling in the specific geological environment is adapted, and smooth drilling construction is guaranteed.
Wherein the geological environment comprises: formation gravel type, mechanical properties of the formation, formation water distribution, etc.
In the aforementioned embodiment, the number of the drilling areas is 10-15, and the aperture of the blind hole is 32-50 mm.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A coal roadway gas drainage method is characterized by comprising the following steps:
drilling a plurality of blind holes in the heading working face of the coal roadway to be tunneled towards the tunneling direction of the coal roadway;
cleaning residues in the blind holes, and prefabricating rock mass crushing slurry;
injecting the prefabricated rock mass crushing slurry into the blind holes by using grouting equipment;
standing for a preset time, solidifying and expanding the static crushing slurry, applying pressure to the hole wall, and changing the internal stress of the coal rock where the coal roadway to be tunneled under the action of the pressure to enlarge the internal cracks of the coal rock;
the gas overflows outwards along the enlarged crack so as to realize gas drainage.
2. The method of claim 1, wherein the pre-forming rock mass fracturing slurry comprises:
determining the tunneling depth and the tunneling working face area of a coal roadway to be tunneled according to a construction design drawing;
calculating the volume of the coal road to be tunneled based on the determined tunneling depth of the coal road to be tunneled and the area of the tunneling working face;
determining the using amount of a static expanding agent according to the volume of the coal road to be tunneled;
and pouring the static expanding agent and water into a mixer according to the proportion of 1/4-1/3, and uniformly mixing to form rock mass crushing slurry.
3. The method according to claim 2, wherein the grouting equipment comprises a grouting pump and a grouting pipeline assembly, the grouting pipeline assembly comprises a grouting pipeline and a grout stop plug, a through hole is formed in the middle of the grout stop plug, and the grout stop plug is sleeved on the grouting pipeline through the through hole;
utilize grouting equipment to pour into the broken thick liquid of prefabricated rock mass into the blind hole including: the grouting pump is allocated to a construction site, and the suction end of the grouting pump is connected into the mixer;
connecting the output end of a grouting pump with one end of a grouting pipeline, inserting the other end of the grouting pipeline into the blind hole, and plugging the orifice by using a grout stopping plug;
and adjusting grouting parameters of a grouting pump, starting the grouting pump, pumping out rock mass crushing slurry in the mixer, and injecting the rock mass crushing slurry into the blind hole through a grouting pipeline.
4. The method according to claim 3, characterized in that a cable channel is reserved between the inner wall and the outer wall of the grouting pipeline; the grouting pipeline assembly further comprises a waterproof vibrator, the diameter of the waterproof vibrator is smaller than the aperture of the blind hole, the waterproof vibrator is arranged at the other end of the grouting pipeline, and a waterproof cable of the waterproof vibrator is led out from the cable channel.
5. The method of claim 2, wherein the static swelling agent comprises a calcium oxide component;
the method further comprises the following steps: mixing a static expanding agent and water according to the proportion and then directly injecting the mixture into the blind hole;
in the mixing process, calcium oxide in the static expanding agent and water are subjected to chemical reaction to release certain heat;
under the action of heat, the gas in the adsorption state is resolved into a free state;
when the formed static crushing slurry is solidified and expanded, pressure is applied to the hole wall, under the action of the pressure, the internal stress of the coal rock where the coal roadway to be tunneled is located changes, and when the internal crack of the coal rock becomes large, the gas in a free state overflows outwards along the large crack, so that gas drainage is realized.
6. The method of claim 1, further comprising: burying a plurality of gas concentration detectors at intervals along the tunneling direction in a rock mass of a coal roadway to be tunneled;
the gas still includes along the fracture that enlarges outwards overflowing to realize after the gas drainage:
determining whether the current gas concentration meets a safety specified value or not according to the current gas concentration detected by the gas concentration detector;
if so, tunneling the coal road to be tunneled according to the tunneling design requirement;
if not, increasing the number of the blind holes, repeating the step of realizing gas drainage to continuously drain the gas, and monitoring the real-time gas concentration value detected by the gas concentration detector;
and if the detected gas concentration value meets a safety specified value, stopping drainage, and beginning to tunnel the coal roadway to be tunneled according to the tunneling design requirement.
7. The method of claim 1, wherein drilling a plurality of blind holes in the heading face of the coal roadway to be excavated in the heading direction of the coal roadway comprises:
determining the distribution quantity of the blind holes according to the tunneling depth of the coal roadway to be tunneled;
selecting a corresponding drilling area at a position above the central line of the head-on working face of the coal roadway to be tunneled according to the determined layout number of the blind holes; the distance between adjacent drilling areas is 10-40 cm;
stopping the drilling equipment in front of the head-on working face of the coal roadway to be tunneled, and enabling the drill bit to be aligned to the selected first drilling area;
simultaneously or sequentially drilling a first blind hole, a second blind hole and a third blind hole in the first drilling area in an inclined downward manner towards the tunneling direction, wherein the Nth blind hole is arranged at the position of a horizontal line at the bottom of the roadway to be tunneled; n is greater than 0 and is an integer;
and repeating the drilling step of the first area to finish the drilling construction of all the drilling areas.
8. The method according to claim 7, wherein the step of drilling a first blind hole, a second blind hole and a third blind hole obliquely downwards in the first drilling area towards the tunneling direction simultaneously or sequentially comprises the following steps:
and adjusting the drilling angle, the diameter and the drilling speed of the drill bit according to the geological environment of each drilling hole in the first drilling area penetrating through the rock stratum.
9. The method according to claim 7 or 8, wherein the number of the drilling areas is 10-15, and the diameter of the blind hole is 32-50 mm.
10. The construction method according to claim 1, wherein the cleaning the residue in the blind hole comprises: the output pipeline of the air pressure system in the mine is connected with an air pipe assembly; the air pipe assembly comprises an air pipe and a valve arranged on the air pipe;
inserting the air pipe into the bottom of the blind hole, starting a wind pressure system, and opening the valve;
the air flow enters the bottom of the blind hole through the air pipe and blows the residues in the hole out of the hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910953570.5A CN110821550A (en) | 2019-10-09 | 2019-10-09 | Coal roadway gas drainage method |
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| CN201910953570.5A CN110821550A (en) | 2019-10-09 | 2019-10-09 | Coal roadway gas drainage method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111535790A (en) * | 2020-04-22 | 2020-08-14 | 山东科技大学 | Coal seam static expansion fracturing permeability-increasing equipment and method |
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