CN111364996B - Deep well coal uncovering method under complex geological condition of strong outburst coal seam - Google Patents
Deep well coal uncovering method under complex geological condition of strong outburst coal seam Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005553 drilling Methods 0.000 claims abstract description 105
- 238000010276 construction Methods 0.000 claims abstract description 56
- 238000009423 ventilation Methods 0.000 claims abstract description 8
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 230000008520 organization Effects 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 73
- 238000000605 extraction Methods 0.000 claims description 47
- 238000007664 blowing Methods 0.000 claims description 31
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- 239000002002 slurry Substances 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 15
- 239000004568 cement Substances 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 9
- 239000002893 slag Substances 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 238000009530 blood pressure measurement Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 239000003034 coal gas Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
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Abstract
The invention discloses a deep well coal uncovering method under a strong outburst coal seam complex geological condition, which comprises the following steps: s1.1, adding geological forepoling; during the construction of an underground connection inclined roadway, constructing a plurality of geological forward-exploring drill holes, exploring the trend of a fault, and analyzing the possibility of bypassing a complex coal seam and passing through the fault plane; s1.2, measuring gas pressure and gas content; two groups of pressure measuring holes are constructed in an underground connection inclined roadway, and the gas content of a coal bed is measured by combining electronic automatic pressure measurement and mechanical pressure measurement; s1.3, translating the underground connection inclined roadway, and adjusting the inclination angle of the roadway; s1.4, changing the construction organization of the roadway and penetrating the roadway in advance; changing the construction sequence of the tunnel, constructing a first-line connection tunnel of a shaft bottom yard and a main substation with the same depth in advance, and communicating the first-line connection tunnel and a down-hole connection inclined tunnel in advance to form a full-negative-pressure ventilation system tunnel; the invention avoids repeated coal uncovering, reduces the coal uncovering safety risk and shortens the construction period; the number of the drilled holes is reduced, and the drilling burden is reduced.
Description
Technical Field
The invention relates to the technical field of deep well coal uncovering of underground coal seams, in particular to a deep well coal uncovering method under complex geological conditions of strong outburst coal seams.
Background
An air inlet well and a connection inclined roadway of-730 to-960 m at the deep part of a certain mine uncover a group B coal seam group in an influence area of F47, an angle of 30 to 58 degrees and H15 to 20m, the coal uncovering elevation is-830 m to-915 m, the coal gas pressure is 8 coal gas pressure is 3.1MPa, and the gas content is 7.6m3The coal gas pressure of t, 4-1 is 3.1MPa, the gas content is 9.2m3And t, coal uncovering of the coal seam group under the complex geological condition of the deep well strong outburst coal seam.
Connecting an inclined roadway at-730 to-960 m at 279 degrees, constructing at 22 degrees when the inclined roadway goes down the mountain, and sequentially uncovering 8 coals, 7-2 coals, 7-1 coals, 6-1 coals, 5-2 coals, 4-2 coals and 4-1 coals to be communicated with a deep air inlet shaft; dividing the coal uncovering work meter into four groups;
the roadway coal uncovering section develops F47, an angle is 30-58 degrees, H is a positive fault of 15-20 m, a fracture zone with the thickness of 6.7m develops on the fault plane, and 8 coals are horizontally pulled apart by 71 m;
under the influence of faults, the coal uncovering roadway is constructed in an F47 positive fault fracture zone, the minimum normal distance of coal is only 7m from a fault hanging plate 8, and abnormal gas emission occurs for many times during the construction of rock roadway excavation and geological forward drilling;
under the influence of faults, the laneway has the phenomenon of repeated coal uncovering. According to related geological data, a roadway is constructed according to a design direction, 8, 7 and 6 coal upper plates and 8, 7 and 6 coal lower plates are required to be sequentially uncovered, and repeated coal uncovering has the problems of high safety risk, large drilling construction amount of forward exploration, pressure measurement and outburst prevention measures, high blowout prevention difficulty of drilling construction and the like, so that the two-level development extension progress is severely restricted.
When the coal uncovering and drilling are carried out in the geological broken zone, the drilling quality is difficult to ensure, and the effectiveness of outburst prevention measures is directly influenced. Firstly, the hole is difficult to form, the drilled hole is easy to collapse and deflect, the hole forming rate is poor, and the casing cannot be put in place; secondly, the hole is easy to block, the bottom of the hole is mudstone, and the mudstone expands when meeting water to cause hole blocking; thirdly, hole sealing is difficult, the hole sealing quality of the drilled hole cannot be guaranteed, and when grouting is carried out under pressure to seal the hole, slurry directly returns from a roadway bottom plate to cause hole sealing failure; fourthly, the extraction effect is poor, the drill hole is communicated with the fracture zone, the extraction hole and the bottom plate fracture zone are connected into a whole, the gas leakage is serious, the gas extraction concentration is low, and the gas extraction effect is poor; fifthly, water blowing is difficult, the water conductivity of a broken zone is good, accumulated water and crack water in the drilling construction process enter the drill hole, so that the drill hole is easily blocked by water and coal slime and is not air-permeable, and no gas is pumped out due to accumulated water in the drill hole; sixthly, the holes are easy to be sprayed, the gas distribution of the fault is not balanced, the holes are easy to be sprayed during the drilling construction process and when coal is seen, and the gas is gushed outwards from the bottom plate of the roadway, so that the gas in the roadway during the drilling construction is large.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problem of difficult coal uncovering of the coal seam group under the complex geological condition of the strong outburst coal seam is solved.
In order to solve the technical problems, the invention provides the following technical scheme: a deep well coal uncovering method under a strong outburst coal seam complex geological condition comprises the following steps:
s1.1, adding geological forepoling; during the construction of the underground connection inclined roadway, constructing a plurality of geological forward-exploring drill holes and exploring the trend of a fault;
s1.2, measuring gas pressure and gas content; two groups of pressure measuring holes are constructed in an underground connection inclined roadway to measure the gas content of the coal bed;
s1.3, analyzing the trend of a fault, the gas content and the gas pressure, determining a roadway with a complex structure, then translating an underground connection inclined roadway, adjusting the inclination angle of the roadway, and bypassing the roadway with the complex structure, so that 8 coals on an F47 fault plane are pulled apart by the fault and the horizontal distance reaches 71m to pass through the roadway, and the roadway directly enters a 7 coal and 6 coal lower tray, thereby throwing away upper trays of the 8 coals, the 7 coal and 6 coal, only uncovering the lower trays of the 7 coal and 6 coal, and uncovering less four layers of coal;
s1.4, changing the construction organization of the roadway and penetrating the roadway in advance; changing the construction sequence of the tunnel, constructing a first-line connection tunnel of a shaft bottom yard and a main substation with the same depth in advance, and communicating the first-line connection tunnel and a down-hole connection inclined tunnel in advance to form a full-negative-pressure ventilation system tunnel;
the air volume of the through tunnel reaches 1500m3More than min, the method plays a positive role in preventing gas overrun caused by drilling spray holes and pumping and exploiting drilled hole water blowing, enables air supply, water supply and drainage to be maximally used during drilling construction, and enables a plurality of drilling machines to be capable of performing centralized construction。
When the underground deep well mining coal seam is complicated in roadway condition, firstly, a plurality of front-exploring drill holes are additionally arranged, the distribution condition of fault geology is confirmed, then two groups of pressure measuring holes are constructed on the roadway, the electronic automatic pressure measuring and the mechanical pressure measuring are combined, the gas content of the coal seam is accurately measured, and the roadway is translated on a drawing in advance, so that the roadway penetrates through the disconnection range of the fault line coal seam, repeated coal uncovering is avoided, the coal uncovering safety risk is reduced, and the construction period is shortened; the number of drilled holes is reduced, and the burden of subsequent drilling is reduced; and then carrying out actual construction on the drilling site.
Preferably, the deep well coal uncovering method under the complex geological condition of the strong outburst coal seam further comprises the following steps:
s2, drilling construction is carried out in the drilling sites by adopting drilling machines, each drilling site is constructed in parallel by adopting one drilling machine, finally five drilling machines are finished simultaneously on the same day, and two-way supply of compressed air and water supply is carried out on the mine;
the pressure wind pressure is ensured to be 0.6MPa and the water pressure is ensured to be more than 3.0MPa during the drilling construction.
S3 arranging the drilling site, so that the drilling site is completely sprayed with the slurry; constructing cement terraces at the bottom of the drill site and peripheral roadways; the construction is convenient.
S4 arranging a pressure reducing hole; controlling the coal bed outside the contour line of the roadway at the underground connection inclined roadway coal uncovering position; two circles of pressure reducing holes are arranged outside the regional measure holes; each drilling hole is provided with a dust settling section;
s5 drilling holes under stable pressure;
s6 keeping the borehole open.
Preferably, in S2, a drilling construction acceptance ledger is established, occurrence of coal seams and drilling construction conditions are confirmed, and a conclusion is fed back in time; ensuring the efficient operation of the drilling machine.
Preferably, in S3, the drill site specification is set to 6.5m × 4m × 3.5 m; the drilling field is completely sprayed with slurry, and the thickness of the slurry reaches 100 mm; and constructing 50mm cement terraces at the bottom of the drill site and peripheral roadways.
Preferably, in the step S4, the drill holes are designed to be arranged according to 3 × 3, all coal seams 7-2 and 7-1 15m outside the contour line of the roadway at the underground connection inclined roadway coal uncovering position are controlled, and the distance between the outer edge of the control range of the drill holes and the contour line of the roadway to be excavated is not less than 7 m; two circles of pressure reducing holes are arranged outside the regional measure holes, the distance between the pressure reducing holes is 3m, and the distance between the final holes is 5 m; each bore hole was designed with a 12m long settling section.
Preferably, the S5 specifically includes the following steps:
s5.1, discharging slag by using high-pressure water before the drill holes see coal, and discharging slag by using compressed air after the drill holes see coal;
preventing the broken holes from appearing in the broken zone passing through the normal fault surface and preventing the water in the broken zone from entering the hole bottom;
s5.2, after the drilling construction is carried out on the final hole position of the dust settling hole, the drill bit is withdrawn firstly, and after the drill bit is withdrawn from the bottom of the hole for a certain distance, the drilling cuttings in the hole are discharged by adopting compressed air twice; ensuring the smoothness in the hole;
s5.3, putting a sleeve pipe 1 inch below the hollow drill rod in the whole process, putting a perforated pipe 1 inch below the coal point, pushing a cutting blade of the straight composite sheet drill bit by using the sleeve pipe, penetrating the drill bit from the inside of the drill bit to the bottom of the hole by the sleeve pipe, pulling out the drill rod, keeping the sleeve pipe in the hole, realizing the bottom of the pipe, and ensuring that coal and rock powder do not enter the pipe from the top end by adopting a sharp top for the sleeve pipe;
s5.4, adopting a construction process of 'two-plugging one-pouring' and 'plugging and pouring integration'; the lower plug is arranged in the hole; and (4) secondary grouting hole sealing is adopted, namely, after the pressure of the plug is applied, primary grouting is carried out, after the construction of each group of drill holes is finished, cement of the last drill hole is cured, and secondary pressurized grouting is intensively carried out.
The technology of 'sealing and injecting the downward cross-layer drilling hole, draining and deslagging the downward cross-layer drilling hole' and drilling with the pipe are comprehensively applied, the extraction refinement requirement is met on the downward drilling hole under the construction of the broken zone, the single-hole extraction concentration reaches over 80%, the dry pipe extraction concentration is kept over 50%, and the extraction maximization is achieved.
Preferably, in the step S5.4, the secondary grouting pressure must reach 2MPa, and the single-hole pressure stabilizing time is not less than 10 min; the slurry is fully permeated into the cracks around the drill hole, the effect of sealing hole, grouting and plugging water for one time is achieved, and the water cement ratio of the cement-water injected slurry is 1: 2.
preferably, the S6 specifically includes the following steps:
s6.1, discharging drill cuttings to ensure that no impurities exist in the holes;
s6.2, the water blowing pipe is put in place, in the extraction casing, the next section of the iron pipe with the pointed top is tied to the coal end point of the hole bottom drill hole, the tied pipe is connected with a self-made drill hole water drainage device special for the hole opening, no joint is left in the middle, and a perforated pipe is adopted in a coal section;
s6.3, continuously blowing holes, wherein a pipe is blown down by adopting pressurized air in a pipe blowing-down process, and the hole blowing process is carried out while the pipe is blown down, so that the continuous hole blowing is carried out until drilling and stubble combining extraction are carried out; the hole after hole sealing is drilled, and a 4-minute high-pressure hose is connected with a water blowing component pressure air pipe of a drilling field;
s6.4, connecting a main pipe with an air bag by adopting a high-pressure hose, directly connecting the air bag to a grouped air pressing iron pipe, arranging the grouped air pressing iron pipe and a gas extraction confluence branch pipe in parallel, directly connecting the pipes with drill holes by using 4-minute high-pressure hoses, and arranging gate valves between the main pipe and the branch pipe as well as between the air bag and the grouped air pressing pipe; the system operation safety is ensured;
s6.5, establishing an independent compressed air system of the pressure reducing hole and the extraction hole, and separately blowing water; the pumping effect is ensured without mutual influence;
s6.6, arranging the pressure reducing holes at the periphery of the extraction drill hole, intercepting fracture water, wherein the gas concentration in the holes is relatively low, the water is large, and the water blowing frequency is high; the water in the extraction hole is relatively small, the gas concentration is high, and the water blowing frequency is low;
s6.7, drilling and draining operations are strengthened, and water is guaranteed to be blown not less than three times per small shift.
And constructing the vertical shaft in the underground crushing zone by adopting a slurry deslagging method. The hydraulic pressure punching test is carried out by adopting a pressing mode combining static pressure water and high pressure water, so that the safety and controllability of the pressed gas are realized, and water and slag are stably discharged. After hydraulic reaming, the extraction purity of the working face is obviously improved.
Preferably, in S6.4, 153mm is adopted for the main pipe of the hydraulic blowing air pipe, a high-pressure hose with a diameter of 75mm is adopted for connection between the main pipe and the air bag, the diameter of the air bag is 153mm, and the air bag is directly connected to a grouping air pressing iron pipe with a diameter of 50 mm.
Preferably, the underground communication inclined roadway is at the position of-730 to-960 m.
Compared with the prior art, the invention has the beneficial effects that:
A. the laneway is translated to pass through the broken range of the fault line coal seam, so that repeated coal uncovering is avoided, the coal uncovering safety risk is reduced, and the construction period is shortened; the number of the drilled holes is reduced, and the drilling burden is reduced;
B. the tunnel is communicated in advance, so that ventilation, feeding, air supply and water supply systems are optimized, and simultaneous construction of a plurality of drilling machines is realized; the extraction effect is obvious, the ventilation of each drill hole is ensured, and the extraction concentration is high; coal uncovering in a geological structure zone is avoided, coal uncovering in a deep well is reduced, and safety of a mine is improved; the technology of 'sealing and injecting the downward cross-layer drilling hole, draining and deslagging the downward cross-layer drilling hole' and drilling with the pipe are comprehensively applied, the extraction refinement requirement is realized on the downward drilling hole under the construction of a broken zone, the single-hole extraction concentration reaches over 80%, the dry pipe extraction concentration is kept over 50%, and the extraction maximization is realized; and constructing the vertical shaft in the underground crushing zone by adopting a slurry deslagging method. The hydraulic pressure punching test is carried out by adopting a pressing mode combining static pressure water and high pressure water, so that the safety and controllability of the pressed gas are realized, and water and slag are stably discharged. After hydraulic reaming, the extraction purity of the working face is obviously improved.
Drawings
FIG. 1 is a geological section of a-730 to-960 m connection roadway of the invention;
FIG. 2 is a horizontal sectional view of-835 m in the-730- — 960m connection inclined lane of the present invention;
FIG. 3 is a cross-sectional view of a drill hole arrangement in a coal uncovering area according to the present invention;
FIG. 4 is a plan view of a coal uncovering area borehole arrangement of the present invention;
FIG. 5 is a cross-sectional view of a plugged borehole of the present invention;
FIG. 6 is a graph showing the extraction concentration variation of the-730 to-960 m connecting roadway of the invention;
FIG. 7 is a graph showing the extraction purity change of the-730 to-960 m connecting roadway according to the invention;
FIG. 8 is a graph of the variation of single well concentration according to the present invention;
FIG. 9 is a graph of the concentration of the dry pipe in the drill site of the present invention.
Detailed Description
In order to facilitate the understanding of the technical solutions of the present invention for those skilled in the art, the technical solutions of the present invention will be further described with reference to the drawings attached to the specification.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The embodiment discloses a deep well coal uncovering method under a strong outburst coal seam complex geological condition, which comprises the following steps:
participating in the figures 1 and 2, S1.1 additionally arranging geological prospecting; during construction of a-730-960 m connecting roadway, 19 geological front drill holes are constructed, the trend of an F47 fault 1 is proved, 8 coal 2 is found to be disconnected near a fault plane of the F47 fault 1 and is pulled away by 71m in the horizontal direction, and the analysis shows that the roadway can bypass 8 coal 2 and directly pass through the fault plane of the F47 fault 1;
participating in fig. 1, S1.2 measuring gas pressure and gas content; two groups of pressure measuring holes 6 are constructed in a-730 to-960 m connecting roadway, and the gas contents of 8 coals 2 and 7 coals 3 are respectively measured to be 7.6m by combining electronic automatic pressure measuring and mechanical pressure measuring3/t、7.5m3The gas pressure is respectively 3.17MPa and 2.9 MPa;
s1.3, connecting an inclined roadway 5 of-730 to-960 m, translating the inclined roadway to the right by 25m, and adjusting the inclination angle of the roadway from 18 degrees to 22 degrees;
the laneway penetrates through the position, where the horizontal distance of 8 coals 2 on the F47 fault 1 surface is pulled by the fault to reach 71m, and directly enters the lower trays of 7 coals 3 and 6 coals 4, so that the upper trays of the 8 coals 2, the 7 coals 3 and 6 coals 4 are thrown away, only the lower trays of the 7 coals 3 and 6 coals 4 are uncovered, the coal uncovering operation of four layers of coals is reduced, a large amount of coal uncovering time is saved, and the coal uncovering risk is reduced;
referring to fig. 3 and 4, after the laneway is translated, only 7-2 coals 32 and 7-1 coals 31 are uncovered, 470 holes are designed for drilling, the number of the drilled holes is reduced by 230, and the total drilled hole amount is 24984.2 m. Reducing the borehole length 5150 m;
s1.4, changing the construction organization of the roadway and penetrating the roadway in advance; changing the construction sequence of the tunnel, and constructing a-817 m shaft bottom yard one-line connection tunnel and a-817 m main substation in advance and a-730-960 m connection inclined tunnel 5 to be communicated in advance to form a full negative pressure ventilation system tunnel;
the air volume of the through tunnel reaches 1500m3More than min, the method plays a positive role in preventing gas overrun caused by drilling spray holes and extracting and pumping drilling water blowing, so that air supply, water supply and drainage are maximally used during drilling construction, and a plurality of drilling machines can be intensively constructed;
the method is characterized in that the method participates in the figure 3, S2 drilling operation is carried out on a drilling site by adopting a drilling machine, five drilling sites are constructed in parallel by adopting 5 drilling machines ZDY-4000S type drilling machines, wherein two drilling machines are adopted for simultaneous construction in the first stage of the fourth drilling site, one drilling machine is withdrawn to the first drilling site for construction after 35 days, so that the five drilling machines are completed simultaneously on the same day, and double-path supply is carried out on air compression and water supply of the mine;
ensuring that the pressure wind pressure is 0.6MPa and the water pressure is more than 3.0MPa during the drilling construction;
establishing a drilling construction acceptance ledger, confirming coal seam occurrence and drilling construction conditions, and feeding back a conclusion in time; analyzing and balancing drilling conditions to ensure efficient operation of the drilling machine;
s3, arranging drill sites, wherein the specification of the drill sites is that the length is multiplied by the depth by the height is 6.5m by 4m by 3.5 m; the drilling field is guaranteed to be sprayed with the slurry, and the thickness of the sprayed slurry reaches 100 mm; constructing 50mm cement terraces on the bottom of the drill site and peripheral roadways;
s4 arranging a pressure reducing hole; the drill hole design is arranged according to 3 multiplied by 3, all 7-2 coals 32 and 7-1 coals 31 15m outside a lane outline at the coal uncovering position of the inclined lane 5 are controlled to be-730 to-960 m, and the distance between the outer edge of the drill hole control range and the lane outline to be excavated is not less than 7 m; two circles of pressure reducing holes are arranged outside the regional measure holes, the distance between the pressure reducing holes is 3m, and the distance between the final holes is 5 m; each drilling hole is provided with a 12m long ash settling section;
s5 drilling holes under stable pressure;
s5.1, discharging slag by using high-pressure water before the drill holes see coal, and discharging slag by using compressed air after the drill holes see coal; the method can prevent the broken hole from appearing and the fracture water of the broken zone from entering the bottom of the hole when the broken zone with the thickness of 6.7m passes through the F47 fault 1;
s5.2, after the drilling construction is carried out on the final hole position of the dust settling hole, withdrawing 2 drills, removing the drill bits from the bottom of the hole by about 3-4 m, and exhausting drill cuttings in the hole by adopting compressed air twice, wherein each time is 5 minutes, and the interval is 1-2 minutes; ensuring the smoothness in the hole;
s5.3, passing through a sleeve pipe which is 1 inch below the hollow drill rod in the whole process, passing through the drill bit from the inside of the drill bit to the bottom of the hole, pulling out the drill rod, keeping the sleeve pipe in the hole, realizing the bottom of the pipe, and ensuring that coal (rock) powder does not enter the pipe from the top end by adopting a pointed top.
Referring to fig. 5, S5.4 adopts a construction process of 'two-plugging one-pouring' and 'plugging-pouring integration'; the length of the upper polyurethane plug and the length of the lower polyurethane plug are not less than 1.5m, and the lower plug is arranged at the position with the hole depth of 20m and is more than 2m away from a coal-seeing point; secondary grouting hole sealing is adopted, namely, after the pressure of the plug is applied, primary grouting is carried out, after the construction of each group of plugging drill holes 8 is finished and the cement of the last plugging drill hole 8 waits for more than 48 hours, secondary pressurized grouting is intensively carried out;
the secondary grouting pressure must reach 2MPa, and the single-hole pressure stabilizing time must not be less than 10 min; the slurry is fully permeated into the cracks around the drill hole, the effect of sealing hole, grouting and plugging water for one time is achieved, and the water cement ratio of the cement-water injected slurry is 1: 2;
s6 keeping the drill hole smooth;
s6.1, discharging drill cuttings to ensure that no impurities exist in the holes;
s6.2, a water blowing pipe is put in place, a bundle pipe with the outer diameter of 12 (the inner diameter of 10mm) of a tip iron pipe with the diameter of 15mm is arranged in an extraction casing pipe to a coal end point of a hole bottom drill hole, the bundle pipe is connected with a self-made drill hole water drainage device special for a hole opening, a joint is not reserved in the middle, and a perforated pipe is adopted in a coal section;
s6.3, continuously blowing holes, wherein a pipe is blown down by adopting pressurized air in a pipe blowing-down process, and the hole blowing process is carried out while the pipe is blown down, so that the continuous hole blowing is carried out until drilling and stubble combining extraction are carried out; ensuring smooth drilling; the hole after hole sealing is drilled, and a 4-minute high-pressure hose is connected with a water blowing component pressure air pipe of a drilling field;
s6.4, optimizing the arrangement of the compressed air and water blowing system, ensuring that the air pressure is 0.6MPa, wherein a main pipe of a water blowing pressure air pipe is 153mm, the main pipe is connected with an air bag through a high-pressure hose with the diameter of 75mm, the air bag is 153mm in diameter, the air bag is directly connected to a grouped compressed air iron pipe with the diameter of 50mm, the grouped compressed air iron pipe and a gas extraction confluence branch pipe are arranged in parallel, 4-minute high-pressure hoses are used for directly connecting the pipes with drill holes, and gate valves are arranged between the main pipe and the branch pipe, and between the air bag and the grouped compressed air pipe; the system operation safety is ensured;
s6.5, establishing an independent compressed air system of the pressure reducing hole and the extraction hole, and separately blowing water; the pumping effect is ensured without mutual influence;
s6.6, arranging the pressure reducing holes at the periphery of the extraction drill hole, intercepting fracture water, wherein the gas concentration in the holes is relatively low, the water is large, and the water blowing frequency is high; the water in the extraction hole is relatively small, the gas concentration is high, and the water blowing frequency is low;
s6.7, drilling and draining operations are strengthened, and water is guaranteed to be blown not less than three times per small shift;
by translating the laneway 25m, the laneway passes through the 8 coal 2 disconnection range of the F47 fault 1, thereby avoiding repeated coal uncovering, reducing the coal uncovering safety risk and directly shortening the construction period by 13 months.
Referring to fig. 3 and 4, the first-stage original coal uncovering design reveals 710 holes for drilling 8 coals 2, the total drilling amount reaches 30134m, after the optimization design, only 7-2 coals 32 and 7-1 coals 31 are uncovered, 470 holes are designed for drilling, the number of drilling holes is reduced by 230, the total drilling amount is 24984.2m, and the drilling length is reduced by 5150 m; the tunnel is communicated in advance, ventilation, feeding, air supply and water supply systems are optimized, and simultaneous construction of five drilling machines is realized. The original planned drilling construction period is 2014.1.5-2014.5.5 and 5 months in total, and the actual drilling construction period is 2014.1.8-2014.3.9. The first stage of drilling construction task is completed 60 days in advance.
Referring to the figures 6, 7, 8 and 9, the extraction effect is remarkable, the ventilation of each drill hole is ensured, the concentration of the extraction main pipe is more than 35%, and the extraction purity reaches 1.2m3More than min, the single-hole extraction concentration is more than 40%, the single-hole high-concentration duration time exceeds 30 days, and the extracted gas purity of the extraction hole reaches 97157m3The purity of the gas extracted from the pressure reducing hole reaches 30939m3. The extraction concentration is always kept atMore than 30 percent.
The technology of 'sealing and injecting the downward cross-layer drilling hole, draining and deslagging the downward cross-layer drilling hole' and drilling with the pipe are comprehensively applied, the extraction refinement requirement is met on the downward drilling hole under the construction of the broken zone, the extraction concentration of part of single holes reaches over 80%, the extraction concentration of the dry pipe is kept over 50%, and the extraction maximization is achieved.
And constructing the vertical shaft in the underground crushing zone by adopting a slurry deslagging method. The hydraulic pressure punching test is carried out by adopting a pressing mode combining static pressure water and high pressure water, so that the safety and controllability of the pressed gas are realized, and water and slag are stably discharged. After hydraulic reaming, the extraction purity of the working face is obviously improved.
Coal uncovering in a geological structure zone is avoided, coal uncovering in a deep well is reduced, and safety of a mine is improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The above-mentioned embodiments only represent embodiments of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the concept of the present invention, and these embodiments are all within the protection scope of the present invention.
Claims (8)
1. A deep well coal uncovering method under a strong outburst coal seam complex geological condition is characterized by comprising the following steps: the method comprises the following steps:
s1.1, adding geological forepoling; during the construction of the underground connection inclined roadway, constructing a plurality of geological forward-exploring drill holes and exploring the trend of a fault;
s1.2, measuring gas pressure and gas content; two groups of pressure measuring holes are constructed in an underground connection inclined roadway, and the gas content of each coal seam is measured;
s1.3, analyzing the fault trend, the gas content and the gas pressure, determining a roadway with a complex structure, then translating an underground connection inclined roadway, adjusting the inclination angle of the roadway, and bypassing the roadway with the complex structure;
s1.4, changing the construction organization of the roadway and penetrating the roadway in advance; changing the construction sequence of the tunnel, constructing a first-line connection tunnel of a shaft bottom yard and a main substation with the same depth in advance, and communicating the first-line connection tunnel and a down-hole connection inclined tunnel in advance to form a full-negative-pressure ventilation system tunnel;
further comprising the steps of:
s2, drilling construction is carried out in the drilling sites by adopting drilling machines, each drilling site is constructed in parallel by adopting one drilling machine, finally five drilling machines are completed simultaneously, and measures of double-path supply of compressed air and water supply are carried out;
s3 arranging the drilling site, so that the drilling site is completely sprayed with the slurry; constructing cement terraces at the bottom of the drill site and peripheral roadways;
s4 arranging a pressure reducing hole; controlling the coal bed outside the contour line of the roadway at the underground connection inclined roadway coal uncovering position; two circles of pressure reducing holes are arranged outside the regional measure holes; each drilling hole is provided with a dust settling section;
s5 drilling holes under stable pressure;
the S5 specifically includes the following steps:
s5.1, discharging slag by using high-pressure water before the drill holes see coal, and discharging slag by using compressed air after the drill holes see coal;
s5.2, after the drilling construction is carried out on the final hole position of the dust settling hole, the drill bit is withdrawn firstly, and after the drill bit is withdrawn from the bottom of the hole for a certain distance, the drilling cuttings in the hole are discharged by adopting compressed air twice;
s5.3, putting a sleeve pipe 1 inch below the hollow drill rod in the whole process, putting a perforated pipe 1 inch below the coal point, pushing a cutting blade of the straight composite sheet drill bit by using the sleeve pipe, penetrating the drill bit from the inside of the drill bit to the bottom of the hole by the sleeve pipe, pulling out the drill rod, keeping the sleeve pipe in the hole, realizing the bottom of the pipe, and ensuring that coal and rock powder do not enter the pipe from the top end by adopting a sharp top for the sleeve pipe;
s5.4, adopting a construction process of 'two-plugging one-pouring' and 'plugging and pouring integration'; the lower plug is arranged in the hole; secondary grouting and hole sealing are adopted, namely, after the pressure of the plug is applied, primary grouting is carried out, after the construction of each group of drill holes is finished and cement of the last drill hole is cured, secondary pressurized grouting is intensively carried out;
s6 keeping the borehole open.
2. The deep well coal uncovering method under the complex geological condition of the strong outburst coal seam according to claim 1, which is characterized in that: and in the S2, establishing a drilling construction acceptance ledger, confirming occurrence of coal seams and drilling construction conditions, and feeding back a conclusion in time.
3. The deep well coal uncovering method under the complex geological condition of the strong outburst coal seam according to claim 1, which is characterized in that: in S3, the drill site specification is set to 6.5m × 4m × 3.5 m; the drilling field is completely sprayed with slurry, and the thickness of the slurry reaches 100 mm; and constructing 50mm cement terraces at the bottom of the drill site and peripheral roadways.
4. The deep well coal uncovering method under the complex geological condition of the strong outburst coal seam according to claim 1, which is characterized in that: in the S4, the drill holes are designed to be arranged according to 3 multiplied by 3, all coal seams 15m outside the contour line of the roadway at the underground connection inclined roadway coal uncovering position are controlled, and the distance between the outer edge of the control range of the drill holes and the contour line of the roadway to be excavated is not less than 7 m; two circles of pressure reducing holes are arranged outside the regional measure holes, the distance between the pressure reducing holes is 3m, and the distance between the final holes is 5 m; each bore hole was designed with a 12m long settling section.
5. The deep well coal uncovering method under the complex geological condition of the strong outburst coal seam according to claim 1, which is characterized in that: in S5.4, the secondary grouting pressure must reach 2MPa, and the single-hole pressure stabilizing time is not less than 10 min; the slurry is fully permeated into the cracks around the drill hole, the effect of sealing hole, grouting and plugging water for one time is achieved, and the water cement ratio of the cement-water injected slurry is 1: 2.
6. the deep well coal uncovering method under the complex geological condition of the strong outburst coal seam according to claim 1, which is characterized in that: the S6 specifically includes the following steps:
s6.1, discharging drill cuttings to ensure that no impurities exist in the holes;
s6.2, the water blowing pipe is put in place, in the extraction casing, the next section of the iron pipe with the pointed top is tied to the coal end point of the hole bottom drill hole, the tied pipe is connected with a self-made drill hole water drainage device special for the hole opening, no joint is left in the middle, and a perforated pipe is adopted in a coal section;
s6.3, continuously blowing holes, wherein a pipe is blown down by adopting pressurized air in a pipe blowing-down process, and the hole blowing process is carried out while the pipe is blown down, so that the continuous hole blowing is carried out until drilling and stubble combining extraction are carried out; the hole after hole sealing is drilled, and a 4-minute high-pressure hose is connected with a water blowing component pressure air pipe of a drilling field;
s6.4, connecting a main pipe with an air bag by adopting a high-pressure hose, directly connecting the air bag to a grouped air pressing iron pipe, arranging the grouped air pressing iron pipe and a gas extraction confluence branch pipe in parallel, directly connecting the pipes with drill holes by using 4-minute high-pressure hoses, and arranging gate valves between the main pipe and the branch pipe as well as between the air bag and the grouped air pressing pipe;
s6.5, establishing an independent compressed air system of the pressure reducing hole and the extraction hole, and separately blowing water;
s6.6, arranging the pressure reducing holes at the periphery of the extraction drill hole, intercepting fracture water, wherein the gas concentration in the holes is relatively low, the water is large, and the water blowing frequency is high; the water in the extraction hole is relatively small, the gas concentration is high, and the water blowing frequency is low;
s6.7, drilling and draining operations are strengthened, and water is guaranteed to be blown not less than three times per small shift.
7. The deep well coal uncovering method under the complex geological condition of the strong outburst coal seam according to claim 6, which is characterized in that: in S6.4, the main pipe of the hydraulic air blowing pipe is 153mm, the main pipe is connected with the air bag through a high-pressure hose with the diameter of 75mm, the diameter of the air bag is 153mm, and the air bag is directly connected to the grouped air pressing iron pipes with the diameter of 50 mm.
8. The deep well coal uncovering method for the strong outburst coal seam under the complex geological condition according to any one of claims 1 to 7, which is characterized by comprising the following steps of: the underground communication inclined roadway is positioned at the position of-730 to-960 m.
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Effective date of registration: 20231030 Address after: 232000 Building 2, wisdom Valley, high tech Zone, Huainan City, Anhui Province Patentee after: Huainan Coal Mine Survey and Design Institute Co.,Ltd. Address before: 232001 Anhui province tianjia'an District mountain in Huainan City Patentee before: HUAINAN MINING INDUSTRY (GROUP) Co.,Ltd. |