CN109854246B - Method for realizing fixed-point roof fracture in double-withdrawal-channel connection lane - Google Patents
Method for realizing fixed-point roof fracture in double-withdrawal-channel connection lane Download PDFInfo
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- CN109854246B CN109854246B CN201910069454.7A CN201910069454A CN109854246B CN 109854246 B CN109854246 B CN 109854246B CN 201910069454 A CN201910069454 A CN 201910069454A CN 109854246 B CN109854246 B CN 109854246B
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Abstract
The invention belongs to the technical field of mine pressure control of a longwall working face at a final mining stage, and particularly relates to a method for realizing fixed-point roof fracture in a double-retraction channel connection roadway. The method comprises the following steps: the first step is as follows: the design digs two back channel arrangement modes in advance, including the main back channel that sets up side by side and supplementary back channel, return air cisoid and main fortune cisoid are connected respectively to main back channel and supplementary back channel both ends, connect through the connection lane between main back channel and the supplementary back channel. The second step is that: when the working face is pushed to a position 50-100 m away from the main withdrawing passage, fan-shaped blast holes are punched on the top plate in the middle of the connecting lane of the main withdrawing passage and the auxiliary withdrawing passage. The third step: and installing a dual-energy-gathering blasting device in the blasting hole, then charging, and completing blasting pre-splitting work in advance when the working face is pushed to be more than 30-50m away from the main withdrawing channel, so that the working face is basically broken along the section where the fan-shaped blasting hole is located when approaching the main withdrawing channel. The large expected deviation of the top plate fracture position caused by inaccurate measurement of the step pitch is avoided.
Description
Technical Field
The invention belongs to the technical field of mine pressure control of a longwall working face at a final mining stage, and particularly relates to a method for realizing fixed-point roof fracture in a double-retraction channel connection roadway.
Background
The moving and face reversing work of the fully mechanized coal mining face is a crucial link in the mine production preparation work, and the control and moving speed of the working face and a withdrawal channel top plate during the final mining period directly restrict the improvement of the single-production level of the fully mechanized coal mining face and the guarantee of the safety quality.
The existing fully mechanized coal mining face withdrawing technology mainly comprises 3 types of pre-digging withdrawing channels, pre-digging double withdrawing channels and pre-digging single withdrawing channels.
The pre-digging double-retraction channel is characterized in that 2 auxiliary roadways parallel to the mining surface are prepared by pre-digging at the final mining line of the working surface, and the 2 auxiliary roadways are communicated through a plurality of connecting roadways. The side, close to the working face stoping line, of the main withdrawing channel is used for providing space for withdrawing and adjusting the support when the main withdrawing channel is communicated with the working face, and a roadway for conveying the hydraulic support out of the working face is used as an auxiliary withdrawing channel.
Compared with the scheme without a pre-digging withdrawal channel, the method has more abundant support direction adjusting space, saves the time for cutting the coal wall, and is favorable for realizing rapid withdrawal; meanwhile, the required section is greatly reduced compared with that of a single-withdrawing channel system, and the stability of the top plate is favorably kept; the multi-point operation is realized, the working face support and the equipment can be directly conveyed into the auxiliary withdrawing channel through the connecting roadway, and the withdrawing speed of the equipment is greatly improved. For example, the auxiliary lane multi-channel fully mechanized mining removal technology is applied to the large willow tower coal mine in the Shendong mining area in China, so that the removal time of a fully mechanized mining surface is reduced to 5-10 days from 30-45 days in the 90 s, and the rapid and safe withdrawal of a working surface is realized.
However, in the final mining period of the working face, the main withdrawal passage is subjected to the whole process of influence of the pressure of the stope face exceeding the front support, the mining influence is very strong, the roadway deformation and damage are serious, the danger and difficulty are brought to the withdrawal work, and the engineering progress is slow.
In order to avoid the dead support caused by the pressure of the top plate when the working face is penetrated and retracted in the last stage of mining, the mine in China usually adopts the pressure-yielding mining measure. The mining is stopped at a proper position, the propelling speed is reduced, the continuous length of the pressure is reduced, the influence of the pressure of the top plate when the working surface is communicated with the retraction channel is avoided, and the danger in the retraction process is reduced.
For example, when the working surface is pushed to a certain distance from the main withdrawal passage, if the working surface is not pressed, the pushing is temporarily stopped (the mining stop time is generally about 10 h), the working surface is waited to be pressed (generally, the support resistance starts to rise, and the coal wall caving is increased), and the pushing is continued until the working surface is communicated with the main withdrawal passage.
However, the field determined mining stop yielding position is only set to be 5-6 m by experience, so that mining stop does not have pressure for more than 24 hours sometimes, and the support is pressed in the withdrawing process sometimes because of inappropriate application of yielding measures, such as a Wulanmulun ore 31401 working face and a great lauta ore 22103 working face in a Shendong mining area.
It can be seen that in the final mining stage of the working face, because the factors influencing the size of the periodic pressure step are more, when the mine pressure observation cannot accurately position the pressure step, the mine pressure control method of adjusting mining height or mining speed is adopted blindly, and an unfavorable roof damage form may occur after the working face is communicated with the withdrawal passage. Therefore, the application of the yielding mining technology is conditional, the mining stopping yielding position is determined only by experience, the basis for adopting yielding mining measures is insufficient, the pressure relief precision and reliability are difficult to guarantee, and a forced method is required to realize the fixed-point fracture of the basic roof.
Disclosure of Invention
The invention provides a method for realizing fixed-point roof fracture in a double-retraction channel connection lane, which aims to solve the problems.
The invention adopts the following technical scheme: a method for realizing fixed-point roof fracture in a double-retraction channel communication lane comprises the following steps:
the first step is as follows: the pre-digging double-withdrawal channel arrangement mode comprises a main withdrawal channel and an auxiliary withdrawal channel which are arranged side by side, wherein two ends of the main withdrawal channel and two ends of the auxiliary withdrawal channel are respectively connected with a return air crossheading and a main transportation crossheading, the main withdrawal channel and the auxiliary withdrawal channel are connected through a connection roadway, the distance between the connection roadways is 40-60 m, and the connection roadway is supported by an anchor net.
The second step is that: when the working face is pushed to a position 50-100 m away from the main withdrawing passage, fan-shaped blast holes are punched on the top plate in the middle of the connecting lane of the main withdrawing passage and the auxiliary withdrawing passage. Two groups of blast holes are drilled in each connecting roadway, the two groups of blast holes are drilled at two sharp corners of a roadway top plate respectively, and the two groups of blast holes are symmetrical about a central line of the connecting roadway. The angle between the drilling hole close to the coal pillar and the top plate layer is 20 degrees, and the included angle between the other blasting holes is 20 degrees. All the blast holes are positioned in the same plane, and the plane is vertical to the axial direction of the connecting roadway.
The third step: and installing a dual-energy-gathering blasting device in the blasting hole, then charging, and completing blasting pre-splitting work in advance when the working face is pushed to be more than 30-50m away from the main withdrawing channel, so that the working face is basically broken along the section where the fan-shaped blasting hole is located when approaching the main withdrawing channel.
In the first step, the width of the coal pillar between the main withdrawing channel and the auxiliary withdrawing channel is 15-30m, and the distance between the connecting roadways is 30-50 m.
In the second step, the blasting presplitting drill holes are required to be arranged in the middle of the connecting roadway, fan-shaped drill holes are drilled on the top plate of the connecting roadway, and the included angle between the blasting holes is 20 degrees. All the blast holes are positioned in the same plane, and the plane is vertical to the axial direction of the connecting roadway.
And in the third step, the working face is required to be pushed to a position at least 30-50m away from the withdrawal passage to complete blasting pre-splitting operation, a double energy-gathered blasting device is used to realize directional fixed-point lancing, manufacture artificial weak face and cut off stress relation of the top plate, and the purpose of avoiding the withdrawal passage from being influenced by high stress is achieved.
Compared with the prior art, the invention provides a method for connecting a roof with double withdrawing channels and breaking a roof at a fixed point in a lane. The method avoids the influence of a roof fracture position estimated deviation caused by inaccurate measurement of the pressure step pitch, and the adverse roof damage form after the working face is communicated with the withdrawal channel possibly caused by a mine pressure control method for blindly adjusting the mining height or mining speed, and overcomes the defects that the pressure relief precision and reliability are difficult to ensure because the mining stopping and yielding position is determined only by experience and the basis for adopting the pressure-yielding mining measures is insufficient.
Drawings
FIG. 1 is a double retract path work surface layout;
FIG. 2 is a plan view of arrangement of communication roadways and blast holes;
FIG. 3 is a diagram of arrangement of blasting pre-splitting blast holes;
FIG. 4 is a schematic structural view of a front wall rock with a working surface and a retraction channel communicated with each other;
in the figure, 1-a main withdrawal channel, 2-an auxiliary withdrawal channel, 3-a connection lane, 4-a return air crossheading, 5-a main transportation crossheading, 6-a large lane, 7-an upper section main transportation crossheading, 8-an auxiliary transportation crossheading, 9-a blast hole, 10-a coal pillar and 11-a blast hole are positioned on the plane.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but 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.
A method for realizing fixed-point roof fracture in a double-retraction channel communication lane comprises the following steps:
the first step is as follows: the pre-digging double-withdrawing channel arrangement mode comprises a main withdrawing channel 1 and an auxiliary withdrawing channel 2 which are arranged side by side, and the width of a coal pillar between the withdrawing channels is reserved to be 25 m. The two ends of the main withdrawing channel 1 and the auxiliary withdrawing channel 2 are respectively connected with a return air gateway 4 and a main transportation gateway 5, the main withdrawing channel 1 and the auxiliary withdrawing channel 2 are connected through a connecting roadway 3, the distance between every two connecting roadways is 40-60 m, and the connecting roadway is supported by an anchor net.
The second step is that: when the working face is pushed to a distance of 50-100 m from the main retraction passage, fan-shaped blast holes are punched towards the top plate in the middle of the connecting roadway 3 (namely at a position 12.5m away from the measuring head of the connecting roadway). Two groups of blast holes are drilled in each connecting roadway, 5 drill holes are drilled in each group at two sharp corners of a roadway top plate, and the two groups of blast holes are symmetrical about a central line of the connecting roadway. The angle between the drilling hole close to the coal pillar and the top plate layer is 20 degrees, and the included angle between the other blasting holes is 20 degrees. All the blast holes are positioned in the same plane, and the plane is vertical to the axial direction of the connecting roadway.
The third step: and a double-energy-gathering blasting device is arranged in the blasting hole, and the direction of the energy-gathering hole is adjusted in the process of arranging the double-energy-gathering blasting device, so that the energy is released along the plane of the fan-shaped hole during blasting of the explosive. And then charging, and when the working face is pushed to be more than 30-50m away from the main retraction channel, completing the blasting pre-splitting work in advance, so that the working face is basically broken along the section where the fan-shaped blasting hole is located when approaching the main retraction channel.
It should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (2)
1. A method for regularly breaking a top plate in a double-withdrawal-channel connection lane is characterized by comprising the following steps: the method comprises the following steps:
the first step is as follows: designing an arrangement mode of pre-digging double-withdrawing channels, wherein the arrangement mode comprises a main withdrawing channel (1) and an auxiliary withdrawing channel (2) which are arranged side by side, coal pillars with the width of 20-30m are reserved between the two withdrawing channels, two ends of the main withdrawing channel (1) and two ends of the auxiliary withdrawing channel (2) are respectively connected with a return air crossheading (4) and a main transportation crossheading (5), the main withdrawing channel (1) and the auxiliary withdrawing channel (2) are connected through a connecting roadway (3), the distance between the connecting roadways is 40-60 m, and the connecting roadway is supported by an anchor net;
the second step is that: when the working face is pushed to a position 50-100 m away from the main retraction channel, fan-shaped blast holes are drilled to the top plate in the middle of each connecting lane (3), two groups of blast holes are drilled in each connecting lane, 5 drill holes are drilled in each group at two sharp corners of the top plate of the lane, and the two groups of blast holes are symmetrical about the central line of the connecting lane; an angle of 20 degrees is formed between the drilling hole close to the coal pillar and the layer surface of the top plate, and the included angle between the other blasting holes is also 20 degrees; all the blast holes are positioned in the same plane, and the plane is vertical to the axial direction of the connecting roadway; the fan-shaped blast holes are punched from the middle part of the connecting roadway (3) to the top plate; two groups of blast holes are drilled in each connecting roadway and are respectively positioned at two sharp corners of a top plate of the roadway so as to prevent the stability of the top plate from being greatly influenced by drilling in the middle of the top plate of the connecting roadway; each group of blast holes comprises 5 drill holes, and the two groups of blast holes are symmetrical about the central line of the communication roadway; the angle between the drill hole close to the coal pillar and the surface of the top plate is 20 degrees, and the included angles among the other blasting holes are also 20 degrees so as to be uniformly distributed, so that the blasting coverage is wider; all blast holes are required to be positioned in the same plane, and the plane is vertical to the axial direction of the connecting roadway;
the third step: installing a double-energy-gathering blasting device in the blasting hole, then charging, adjusting the direction of the energy-gathering hole in the process of installing the double-energy-gathering blasting device, releasing energy along the plane where the fan-shaped hole is located during blasting of explosives, then charging, completing blasting pre-splitting work in advance when the working face is pushed to be 30-50m away from the main withdrawing channel, and realizing that the working face is basically broken along the section where the fan-shaped blasting hole is located when the working face approaches the main withdrawing channel.
2. The method of claim 1, wherein the method comprises the steps of: in the third step, a dual energy gathering blasting device is required to be installed in the blasting hole, and the direction of the energy gathering hole is required to release energy along the plane where the fan-shaped hole is located when the explosive is exploded during installation so as to realize directional fixed-point lancing, manufacture an artificial weak surface and cut off the stress relation of the top plate; secondly, the working face is required to be pushed to be 30-50m away from the retraction passage, namely, the blasting pre-splitting work is completed in advance when the last cycle of pressure coming does not occur.
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| CN111472781A (en) * | 2020-05-18 | 2020-07-31 | 新汶矿业集团有限责任公司 | Arrangement and construction method of special roadway for coal mining area working face retraction |
| CN113738361B (en) * | 2021-08-06 | 2022-06-21 | 中国矿业大学 | Method for preventing and treating rock burst of circular arc section of fully mechanized caving face of steeply inclined coal seam |
| CN115839249B (en) * | 2023-01-16 | 2023-04-18 | 煤炭科学技术研究院有限公司 | Method for arranging ultra-long working face double-measure roadway under sequential mining condition |
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