CN106968706A - A kind of method that hydraulic slotted liner technique eliminates coal and gas prominent in heading driving - Google Patents
A kind of method that hydraulic slotted liner technique eliminates coal and gas prominent in heading driving Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000005553 drilling Methods 0.000 claims abstract description 21
- 238000009412 basement excavation Methods 0.000 claims abstract description 16
- 238000010276 construction Methods 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims description 36
- 239000003818 cinder Substances 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims description 4
- 239000003566 sealing material Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 230000008030 elimination Effects 0.000 claims description 3
- 238000003379 elimination reaction Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 2
- 238000004826 seaming Methods 0.000 claims 2
- 230000035699 permeability Effects 0.000 abstract description 4
- 238000005507 spraying Methods 0.000 abstract description 2
- 230000005641 tunneling Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 46
- 238000000605 extraction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/34—Arrangements for separating materials produced by the well
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Abstract
一种水力割缝消除煤层巷道掘进中煤与瓦斯突出的方法，涉及消除煤矿瓦斯灾害的方法，解决现有消除煤与瓦斯突出的施工工作量大、时间长的技术问题。本发明的步骤为：首先在煤层巷道的掘进面施工水平钻孔，利用特殊的水力割缝设备在沿着钻孔伸进可承受高压力的输水管，直至钻孔的孔底。高压水管一端安装可水平喷射高压水射流的射流器。一边回退高压钢管，一边利用高压水射流切割钻孔，使煤层卸压、增透。本发明用于地下煤层巷道掘进，具有能够快速消除煤层的煤与瓦斯突出的危险，加快煤层巷道掘进速度的优点。
A method for eliminating coal and gas outbursts in coal seam roadway excavation by hydraulic slits, relates to a method for eliminating gas disasters in coal mines, and solves the existing technical problems of large amount of construction work and long time for eliminating coal and gas outbursts. The steps of the present invention are as follows: firstly, horizontal drilling is constructed on the driving surface of the coal seam roadway, and a water delivery pipe that can withstand high pressure is extended along the drilling hole to the bottom of the drilling hole by using special hydraulic slotting equipment. One end of the high-pressure water pipe is equipped with an ejector capable of horizontally spraying high-pressure water jets. While retracting the high-pressure steel pipe, the high-pressure water jet is used to cut the drill hole to relieve the pressure of the coal seam and increase the permeability. The invention is used for tunneling of underground coal seam roadway, and has the advantages of being able to quickly eliminate the danger of coal and gas outburst in the coal seam and speed up the driving speed of the coal seam roadway.
Description
技术领域technical field
本发明涉及煤矿瓦斯灾害的解决方法，特别涉及一种地下煤层巷道掘进过程中消除煤与瓦斯突出的方法。The invention relates to a solution to gas disasters in coal mines, in particular to a method for eliminating coal and gas outbursts during tunneling of underground coal seam roadways.
背景技术Background technique
煤与瓦斯突出是煤矿中危害性极大的瓦斯事故。地下煤层由于受到它上覆地层的压力，处于三维压缩的状态。在煤炭形成的过程中产生大量的甲烷及其它少量气体，被压缩，并储存在煤炭中的微小孔隙中，这些混合气体称为瓦斯。在煤层中掘进巷道时，巷道周围以及掘进工作面(又称为掌子面)形成很高的应力集中。掘进巷道时，一边掘进，一边对巷道周围进行支护。但巷道的掘进工作面要进行掘进，不能支护。当煤的强度低、或者地应力大、或者瓦斯压力大时，巷道掘进工作面的煤层就会向巷道内变形。当变形严重时，工作面前方的煤体失去支撑能力，涌向巷道，形成煤与瓦斯突出事故。Coal and gas outburst is a very harmful gas accident in coal mines. The underground coal seam is in a state of three-dimensional compression due to the pressure of its overlying strata. In the process of coal formation, a large amount of methane and other small amounts of gas are produced, compressed, and stored in tiny pores in the coal. These mixed gases are called gas. When excavating a roadway in a coal seam, high stress concentrations are formed around the roadway and at the face of the excavation (also known as the tunnel face). When excavating the roadway, support the surroundings of the roadway while digging. However, the excavation face of the roadway needs to be excavated and cannot be supported. When the strength of the coal is low, or the ground stress is high, or the gas pressure is high, the coal seam of the roadway excavation face will be deformed into the roadway. When the deformation is severe, the coal body in front of the working face loses its supporting capacity and rushes to the roadway, causing coal and gas outburst accidents.
目前解决煤与瓦斯突出的方法有：1)在煤层中施工密集的钻孔，这些钻孔可以排除煤中一部分瓦斯，降低煤中瓦斯的压力；钻孔变形后，能够使煤层释放一部分变形能，降低煤层的内应力，煤矿把这种变化称为煤层卸压。这种方法的缺点是施工的钻孔数量多。2)在煤层中进行水力冲孔，作用也是排出部分瓦斯，并使煤层卸压。这种方法的缺点是水力冲孔形成的孔洞大。3)在煤层中施工一定数量的瓦斯抽放钻孔，利用这些钻孔排放煤中的瓦斯，一方面能降低煤中瓦斯的压力，另一方面瓦斯被排出后，煤发生收缩变形，也能达到煤层卸压的目的。这种方法的缺点是瓦斯抽放的时间长。At present, the methods for solving coal and gas outburst are as follows: 1) Construct densely drilled holes in the coal seam, which can remove part of the gas in the coal and reduce the pressure of the gas in the coal; after the deformation of the drilled holes, the coal seam can release part of the deformation energy , to reduce the internal stress of the coal seam, and the coal mine calls this change the pressure relief of the coal seam. The disadvantage of this method is the large number of drilling holes for construction. 2) Carrying out hydraulic punching in the coal seam is also used to discharge part of the gas and relieve the pressure of the coal seam. The disadvantage of this method is that the holes formed by hydraulic punching are large. 3) Construct a certain number of gas drainage boreholes in the coal seam, and use these boreholes to discharge the gas in the coal. On the one hand, it can reduce the pressure of the gas in the coal. To achieve the purpose of coal seam pressure relief. The disadvantage of this method is the long time for gas extraction.
发明内容Contents of the invention
本发明的目的在于克服现有技术的缺点，提供一种水力割缝消除煤层巷道掘进中煤与瓦斯突出的方法，解决现有消除煤与瓦斯突出的施工过程，工作量大、时间长的技术问题。The purpose of the present invention is to overcome the shortcomings of the prior art, provide a method for eliminating coal and gas outburst in coal seam roadway excavation by hydraulic slits, and solve the existing construction process of eliminating coal and gas outburst, which requires a large amount of work and takes a long time. question.
本发明是通过以下技术方案来实现的：The present invention is achieved through the following technical solutions:
一种水力割缝消除煤层巷道掘进中煤与瓦斯突出的方法，其步骤如下：A method for eliminating coal and gas outburst in coal seam roadway excavation by hydraulic slotting, the steps are as follows:
①钻孔：根据煤层环境与巷道掘进头实际情况，设计钻孔间距与高度，钻孔施工与普通抽放钻孔相同；① Drilling: According to the coal seam environment and the actual situation of the roadway heading head, the spacing and height of the drilling holes are designed, and the drilling construction is the same as that of ordinary drainage drilling;
②封孔：采用一端带法兰的封孔管封孔；②Sealing: Use a sealing tube with a flange at one end to seal the hole;
③将气-水-煤渣分离器安装在封孔管上，并在气-水-煤渣分离器与负压管之间连接放水器和管道流量计；③ Install the gas-water-coal cinder separator on the sealing pipe, and connect the water release device and the pipeline flow meter between the gas-water-coal cinder separator and the negative pressure pipe;
④采用高压水力割缝设备进行水力割缝，首先将高压水钻杆伸入孔底，然后一边回退，一边割缝，割缝过程中对割缝孔进行负压抽放，防止瓦斯涌入巷道；④ Use high-pressure hydraulic cutting equipment to carry out hydraulic cutting. First, extend the high-pressure water drill pipe into the bottom of the hole, and then cut back while cutting. During the cutting process, the cutting hole is drained under negative pressure to prevent gas from pouring into the roadway ;
⑤辅助抽放，割缝过程中必须对割缝孔进行负压抽放，防止瓦斯涌入巷道；⑤Auxiliary drainage, during the cutting process, negative pressure drainage must be performed on the cutting hole to prevent gas from pouring into the roadway;
⑥割缝完成后，将钻孔连接负压管，进行正常抽放，在抽放过程中，进行瓦斯流量的检测与测量，评价抽放效果；⑥ After the slotting is completed, connect the borehole to the negative pressure pipe for normal drainage. During the drainage process, detect and measure the gas flow to evaluate the drainage effect;
⑦割缝后对煤层取样，根据煤层防突指标进行测定，评价消突效果。⑦ Sampling the coal seam after cutting the seam, measuring according to the outburst prevention index of the coal seam, and evaluating the outburst elimination effect.
进一步，步骤①中，所述钻孔的孔径60mm～90mm、孔深80m～200m。Further, in step ①, the diameter of the drilled hole is 60mm-90mm, and the hole depth is 80m-200m.
进一步，步骤②中，所述封孔的深度6m～20m，封孔材料选用聚氨酯材料或水泥。Further, in step ②, the depth of the sealing hole is 6m-20m, and the sealing material is polyurethane material or cement.
进一步，步骤③中，所述气-水-煤渣分离器的排气孔连接所述放水器，所述管道流量计连接在所述放水器与所述负压管之间；所述气-水-煤渣分离器下部的排放口排出水和煤渣。Further, in step ③, the vent hole of the gas-water-coal cinder separator is connected to the water release device, and the pipeline flowmeter is connected between the water release device and the negative pressure pipe; the gas-water - The discharge port at the lower part of the cinder separator discharges water and cinders.
进一步，步骤④中，所述进行水力割缝，割缝方向为“横竖组合”，所有钻孔距孔口10m～20m范围内皆不割缝。Further, in step ④, hydraulic slotting is carried out, the slotting direction is "horizontal and vertical combination", and all drilling holes are not slotted within a range of 10m to 20m from the orifice.
进一步，步骤④中，所述进行水力割缝，采用对接钻杆式高压水力割缝设备，其射流压力30MPa～60MPa。Further, in step ④, the hydraulic cutting is carried out by using butt drill pipe type high-pressure hydraulic cutting equipment with a jet pressure of 30MPa-60MPa.
本发明与现有技术相比，具有以下优点和有益效果：Compared with the prior art, the present invention has the following advantages and beneficial effects:
由于通过水力割缝技术对掘进煤体提前完全卸压，从根本上消除了应力集中引起的煤体失稳突出；割缝的过程相当于煤体注水，使煤体冲击倾向降低，失稳度降低；由于瓦斯超前大量预抽采，使煤体瓦斯含量和压力大幅度降低，瓦斯内能降低，根本上消除了瓦斯突出的动力。本发明用于地下煤层巷道掘进，具有能够快速消除煤层的煤与瓦斯突出的危险，加快煤层巷道掘进速度的优点。Due to the complete pressure relief of the excavated coal body in advance through the hydraulic slotting technology, the coal body instability caused by stress concentration is fundamentally eliminated; Reduced; due to the pre-extraction of a large amount of gas in advance, the gas content and pressure of the coal body are greatly reduced, the internal energy of the gas is reduced, and the power of gas outburst is basically eliminated. The invention is used for driving underground coal seam roadway, and has the advantages of being able to quickly eliminate the danger of coal and gas outburst in the coal seam and speed up the driving speed of the coal seam roadway.
图1是临时封孔装置图；Fig. 1 is a temporary sealing device diagram;
图2是气-水-煤渣分离器与流量计及负压管连接图；Fig. 2 is the connection diagram of gas-water-coal cinder separator, flow meter and negative pressure pipe;
图3是水力割缝钻孔布置图。Fig. 3 is a hydraulic slotting drilling layout diagram.
其中：1—煤层钻孔，2—封孔管，3—气-水-煤渣分离器，3.1—排气孔，3.2—排放口，4—负压管，5—放水器，6—管道流量计，7—高压水钻杆，8—水及煤渣。Among them: 1—Coal seam drilling, 2—Sealing pipe, 3—Gas-water-cinder separator, 3.1—Exhaust hole, 3.2—Outlet, 4—Negative pressure pipe, 5—Water release device, 6—Pipeline flow Count, 7—high pressure water drill pipe, 8—water and cinder.
具体实施方式detailed description
下面将结合附图和实施例对本发明的技术方案进行清楚、完整的描述。The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments.
一种水力割缝消除煤层巷道掘进中煤与瓦斯突出的方法，其工程选址为某煤矿单一突出煤层，煤层中某巷道掘进工作面沿煤层布置，矩形断面，巷道净宽5.2m，净高3.4m(参看图3)。A method for eliminating coal and gas outburst in coal seam roadway excavation by hydraulic slotting. The engineering site is a single outburst coal seam in a coal mine, and the excavation face of a certain roadway in the coal seam is arranged along the coal seam. 3.4m (see Figure 3).
如图1、2、3所示，一种水力割缝消除煤层巷道掘进中煤与瓦斯突出的方法，其步骤如下：As shown in Figures 1, 2, and 3, a method for eliminating coal and gas outburst in coal seam roadway excavation by hydraulic slotting, the steps are as follows:
①钻孔：与施工普通抽放钻孔相同，孔深80m，孔径φ90mm，钻孔1高度为距顶板1.7m，钻孔间距为1m；① Drilling: Same as the ordinary drainage drilling, the hole depth is 80m, the hole diameter is φ90mm, the height of drilling 1 is 1.7m from the top plate, and the drilling spacing is 1m;
②封孔：用带法兰的封孔管2封孔，封孔材料选用聚氨酯材料，封孔深度12m；②Sealing: Use the sealing pipe 2 with flange to seal the hole, the sealing material is polyurethane material, and the sealing depth is 12m;
③将气-水-煤渣分离器3安装在封孔管2上，并在气-水-煤渣分离器3与负压管4之间连接放水器5和管道流量计6；③ Install the gas-water-coal cinder separator 3 on the sealing pipe 2, and connect the water release device 5 and the pipeline flowmeter 6 between the gas-water-coal cinder separator 3 and the negative pressure pipe 4;
④采用高压水力割缝设备进行水力割缝，首先将高压水钻杆7伸入孔底，然后一边回退，一边割缝，割缝方向为“横竖组合”，水平割缝主要用于增加煤层中的裂隙数量，使煤层原始应力释放，增加煤层透气性，垂直割缝主要用于增大抽采范围，屏蔽巷道两侧煤体的瓦斯涌出；④ Use high-pressure hydraulic cutting equipment to carry out hydraulic cutting. First, extend the high-pressure water drill pipe 7 into the bottom of the hole, and then retreat while cutting. The cutting direction is "horizontal and vertical combination". Horizontal cutting is mainly used to increase coal seam The number of cracks can release the original stress of the coal seam and increase the air permeability of the coal seam. The vertical slots are mainly used to increase the extraction range and shield the coal gas on both sides of the roadway from gushing out;
⑤割缝过程中对割缝孔进行负压抽放，防止瓦斯涌入巷道；⑤ Negative pressure drainage is performed on the slotting hole during the slotting process to prevent gas from pouring into the roadway;
⑥割缝完成后，将钻孔1连接负压管4，进行正常抽放；在抽放过程中，进行瓦斯流量的检测与测量，评价抽放效果；⑥ After the slotting is completed, connect the borehole 1 to the negative pressure pipe 4 for normal drainage; during the drainage process, detect and measure the gas flow to evaluate the drainage effect;
⑦在割缝后，对煤层取样，根据煤层防突指标进行测定，评价消突效果。⑦ After cutting the seam, take samples from the coal seam, measure according to the outburst prevention index of the coal seam, and evaluate the outburst elimination effect.
步骤①中，所述钻孔1的孔径还可以为60mm、孔深还可以为200m。In step ①, the borehole 1 may have a diameter of 60mm and a depth of 200m.
步骤②中，所述封孔1的深度还可以为6m～20m，封孔材料还可以为选用水泥。In step ②, the depth of the sealing hole 1 can also be 6m-20m, and the sealing material can also be cement.
步骤③中，所述气-水-煤渣分离器3的排气孔3.1连接所述放水器5，所述管道流量计6连接在所述放水器5与所述负压管4之间；所述气-水-煤渣分离器3下部的排放口3.2排出水和煤渣8。In step ③, the vent hole 3.1 of the gas-water-cinder separator 3 is connected to the drainer 5, and the pipeline flowmeter 6 is connected between the drainer 5 and the negative pressure pipe 4; The discharge port 3.2 at the bottom of the gas-water-coal cinder separator 3 discharges water and coal cinder 8.
步骤④中，为了保证施工安全，距孔口10m～20m范围内皆不割缝。In step ④, in order to ensure construction safety, no slots are cut within 10m to 20m from the orifice.
本发明采用的主要设备为高压水力割缝设备，高压水力割缝的射流压力达到30MPa～60MPa。消除煤层巷道掘进的煤与瓦斯突出的水力割缝技术采用对接钻杆式水力割缝设备，水力割缝时沿着钻孔伸进可承受高压力的高压水钻杆7，直至钻孔的孔底。高压水钻杆一端安装可水平喷射高压水射流的射流器。一边回退高压水钻杆，一边利用高压水射流切割钻孔，使煤层卸压、增透。The main equipment used in the present invention is high-pressure hydraulic slotting equipment, and the jet pressure of the high-pressure hydraulic slotting reaches 30MPa-60MPa. The hydraulic cutting technology to eliminate coal and gas outburst in coal seam roadway excavation adopts butt drill pipe hydraulic cutting equipment. During hydraulic cutting, the high-pressure water drill pipe 7 that can withstand high pressure is inserted along the drill hole to the bottom of the drill hole . One end of the high-pressure water drill pipe is equipped with an ejector capable of horizontally spraying high-pressure water jets. While retracting the high-pressure water drill pipe, the high-pressure water jet is used to cut the drill hole, so as to relieve the pressure of the coal seam and increase the permeability.
本发明在煤层中已有的瓦斯抽放钻孔实施水平或垂直切缝；其中通过水平割缝可增加煤层中的裂隙数量，使煤层原始应力释放，增加煤层透气性；通过垂直割缝可增大抽采范围，屏蔽煤层内瓦斯向掘进巷道的涌入，使得防突指标达到安全范围，达到很好的预防与控制瓦斯突出的效果。The present invention implements horizontal or vertical slits in the existing gas drainage boreholes in the coal seam; the number of cracks in the coal seam can be increased through horizontal slits, the original stress of the coal seam can be released, and the air permeability of the coal seam can be increased; The large extraction range shields the influx of gas in the coal seam into the tunnel, making the outburst prevention index reach the safe range, and achieves a good effect of preventing and controlling gas outburst.
在本发明的水力割缝过程中可能伴随瓦斯喷出。为防止巷道瓦斯短时超限，割缝前需要对钻孔进行封孔。割缝时在割缝的钻孔孔口安装气-水-煤渣分离器。高压水钻杆穿过分离器进入钻孔。割缝时，气、水、煤渣通过分离器排放。分离器的排气孔3.1连接放水器5，管道流量计6连接在放水器与负压管之间，达到排放和计量瓦斯气的目的。水和煤渣8从分离器下部的排放口3.2排出。同时，也可以通过调整割缝速度控制瓦斯喷出。During the hydraulic cutting process of the present invention, it may be accompanied by gas ejection. In order to prevent the roadway gas from exceeding the limit in a short time, it is necessary to seal the drilled holes before cutting the joints. Install a gas-water-coal slag separator at the drilling hole of the slot when slotting. The high-pressure water drill pipe passes through the separator and enters the borehole. When cutting the seam, gas, water and cinder are discharged through the separator. The exhaust hole 3.1 of the separator is connected to the drainer 5, and the pipeline flow meter 6 is connected between the drainer and the negative pressure pipe to achieve the purpose of discharging and measuring gas. Water and cinder 8 are discharged from the discharge port 3.2 at the lower part of the separator. At the same time, the gas injection can also be controlled by adjusting the cutting speed.
在本发明中，为了掌握割缝过程中的瓦斯排放量，在钻孔口部安装气-水-煤渣分离器，并在分离器与抽放负压管之间连接放水器和管道流量计。放水器有效地防止瓦斯气携带的少量煤渣和水进入负压系统。流量计可以测量瓦斯混合气体的流量与瓦斯浓度。根据割缝时间，可以估算出割缝过程中的瓦斯涌出量。In the present invention, in order to grasp the gas discharge during the cutting process, a gas-water-coal cinder separator is installed at the mouth of the borehole, and a water release device and a pipeline flowmeter are connected between the separator and the suction negative pressure pipe. The water release device effectively prevents a small amount of cinder and water carried by the gas from entering the negative pressure system. The flow meter can measure the flow rate and gas concentration of gas mixture. According to the cutting time, the gas emission during the cutting process can be estimated.
本发明能够以多种形式具体实施而不脱离本发明的范围，应当理解，上述实施例不限于前述的细节，而应在权利要求所限定的范围内广泛地解释。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明结构的前提下，作岀的改进和变化也应视为本发明的保护范围。The present invention can be embodied in various forms without departing from the scope of the invention, and it should be understood that the above-described embodiments are not limited to the foregoing details, but should be construed broadly within the scope defined by the claims. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, the improvements and changes made should also be regarded as the protection scope of the present invention.
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| CN117868864A (en) * | 2024-01-03 | 2024-04-12 | 中煤(天津)地下工程智能研究院有限公司 | A method and device for hydraulic cutting to prevent high-stress surrounding rock spalling |
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