Deep well double working face meeting composite disaster energy segmentation control method

Abstract

The application discloses a kind of deep well double working face meeting compound disaster energy segmentation control method, first in mining area 1 and mining area 2 between determining management area, and in management area within division first to fourth area form continuous management zone, each area has specific function, first area and third area are energy absorption zone, for absorbing subsequent mining and tunneling process produced in situ stress energy and gas impact energy;Second area is energy segmentation zone, for the energy produced by mining area 1 and the energy produced by mining area 2 is segmented;Fourth area is energy resistance zone, for resisting the in-situ stress energy from mining area 1 after weakening through first area to third area;Through the synergistic effect of four areas, in-situ stress absorption, segmentation and resistance can be realized simultaneously, the in-situ stress energy and gas energy in the whole coal seam are segmented and absorbed respectively, to reduce the risk of compound disaster, so as to realize the safe mining of mining area 1 and mining area 2.

Description

Technical Field

[0001] This invention belongs to the field of coal and rock dynamic disaster prevention and control technology, specifically relating to a method for energy segmentation and control of complex disasters caused by the encounter of two working faces in a deep well. Background Technology

[0002] With the increasing deep coal mining in my country, the complex coal and rock dynamic disasters caused by the superposition of small geological structures and mining-induced stress have attracted widespread attention. These complex disasters are triggered by the coupling effects of high gas pressure, high ground stress, low-permeability coal seams, and surrounding rock at depth. Unlike the single disasters in shallow mining stages, deep complex disasters exhibit the dual characteristics of coal and gas outbursts and rockbursts. Following a rockburst or a strong mine earthquake, extensive fracture channels are created, leading to abnormal gas outbursts and exacerbating outburst disasters in high-gas areas. Furthermore, gas also affects coal strength, deformation and fracture, and rockburst tendency, increasing the complexity of the disaster. Therefore, it is necessary to predict and prevent this type of mine-pressure-gas complex dynamic disaster. The encounter of two working faces in deep, high-gas coal seams is one of the potential factors. To improve production efficiency, coal mines simultaneously mine the overlying coal seam and excavate the machine roadways in the underlying coal seam, but deep mining increases the risk of complex dynamic disasters. Therefore, how to provide a new method to achieve mining with two working faces meeting while effectively preventing the occurrence of combined dynamic disasters of mine gas and coal, thereby effectively improving the production efficiency of coal mines, is a technical problem that urgently needs to be solved in this industry. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a method for energy segmentation and control of complex disasters caused by the encounter of two working faces in deep mines. By constructing and treating the area before the two working faces, mining can be carried out when the two working faces meet, while effectively preventing the occurrence of complex dynamic disasters caused by mine gas, thereby effectively improving the production efficiency of coal mines.

[0004] To achieve the above objectives, the technical solution adopted by this invention is: a method for energy segmentation and control of complex disasters caused by encountering two working faces in a deep well, the specific steps of which are as follows:

[0005] A. Select the treatment area location: First, determine the location of the roadway in mining area 1 and the pre-excavation roadway in mining area 2. Based on the above locations, the coal seam area in mining area 2 between the roadway in mining area 1 and the pre-excavation roadway in mining area 2 is determined as the treatment area.

[0006] B. Internal Division of the Treatment Area: Before the coal seam of Mining Area 1 has been mined and before the roadway of Mining Area 2 has been excavated, the treatment area determined in step A is divided into four areas in sequence from Mining Area 1 to Mining Area 2: Area 1, Area 2, Area 3, and Area 4. Area 1 is closest to the roadway of Mining Area 1, and Area 4 is closest to the pre-excavated roadway of Mining Area 2. Area 1 and Area 3 have the same area and are the largest among the four areas. Area 2 has a larger area than Area 4.

[0007] C. Construction and Treatment Areas: Four areas are constructed according to the division in step B. The first and third areas are energy absorption zones, used to absorb the ground stress energy and gas impact energy generated during subsequent mining and tunneling. The second area is an energy separation zone, used to separate the energy generated by the mining of mining area 1 and the energy generated by the tunneling of mining area 2, so that the energy generated by the mining of mining area 1 is absorbed through the first area, and the energy generated by the tunneling of mining area 2 is absorbed through the third area. The fourth area is an energy resistance zone, used to resist the ground stress energy transmitted from mining area 1 after being weakened by passing through the first and third areas, and to enhance the stability of the coal body in mining area 2.

[0008] D. Simultaneous mining of two working faces: After completing step C, the mining of the coal seam in mining area 1 and the excavation of the roadway in mining area 2 begin simultaneously. At this time, most of the energy generated by the mining of mining area 1 is absorbed by the first area. After the remaining energy is divided and absorbed by the second and third areas, very little energy reaches the fourth area and is resisted by the fourth area, thus completing the energy buffering function of mining area 1. At the same time, the energy generated by the excavation of mining area 2 is weakened by the energy resistance zone and absorbed by the third area. The remaining energy completes the energy buffering function in the second area. By dividing and absorbing the energy of mining area 1 and mining area 2 respectively, the in-situ stress energy and gas energy in the overall coal seam are separated and absorbed and buffered separately to reduce the risk of compound disasters, thereby achieving safe mining of mining area 1 and mining area 2.

[0009] Furthermore, the first to fourth regions are all rectangular in shape and are arranged side by side.

[0010] Furthermore, in step B, the areas of the first and third regions each account for 42% of the treated area; the area of ​​the second region accounts for 10% of the treated area; and the area of ​​the fourth region accounts for 6% of the treated area. This proportion ensures that the treated area achieves optimal energy segmentation and absorption.

[0011] Furthermore, the specific construction of the four areas in step C is as follows: hydraulic drilling is carried out in the first area and the third area respectively to unload the ground stress in the coal seam, and at the same time, the gas is extracted to release the ground stress energy and gas energy in the two areas, so that both areas become energy absorption zones.

[0012] The second region is subjected to intensified hydraulic perforation, so that the perforation density in this region is at least twice that of the first and third regions. This unloads the geostress energy in the coal seam in this region, reduces stress transmission to the coal seam below, and at the same time extracts gas from the coal seam to reduce the gas concentration to below 0.4%, making it an energy separation zone.

[0013] Grouting reinforcement was carried out in the fourth zone to enhance the stability of the coal body and make it an energy-resistant zone.

[0014] Furthermore, the hydraulic perforation involves using high-pressure water flow to perforate the coal seam, and the grouting reinforcement operation involves injecting materials with reinforcing structural properties into the coal seam, such as polyurethane materials or silicate cement.

[0015] Furthermore, in step D, when mining area 1 is being mined, a roof cutting and roadway retention is implemented to cut off the roof of the coal seam in the mined area, release the stress energy of the roof, and prevent the stress from being transmitted to the coal seam in mining area 2. At the same time, the roadway in mining area 1 is retained to resist the falling coal seam roof.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. This invention determines the treatment area before the coal seam of mining area 1 has been mined and before the roadway of mining area 2 has been excavated. Within the treatment area, a continuous treatment zone is formed by dividing the area into four zones. Each zone has a specific function: the first and third zones are energy absorption zones, used to absorb the ground stress energy and gas impact energy generated during subsequent mining and excavation; the second zone is an energy separation zone, used to separate the energy generated by the mining of mining area 1 and the energy generated by the excavation of mining area 2; the fourth zone is an energy resistance zone, used to resist the ground stress energy transmitted from mining area 1 after being weakened by the first to third zones. Through the synergistic effect of the four zones, the absorption, separation and resistance of ground stress can be achieved simultaneously, separating the ground stress energy and gas energy in the overall coal seam and absorbing and buffering them separately to reduce the risk of compound disasters, thereby achieving safe mining of mining areas 1 and 2.

[0018] 2. The construction measures adopted in this invention are all mature construction equipment and methods used in mines, which are easy to use directly in different mines, and the entire construction process is simple, thus having wide applicability in various different mines. Attached Figure Description

[0019] Figure 1 This is an energy segmentation diagram of a complex disaster caused by the encounter of two working faces after the construction of this invention;

[0020] Figure 2 yes Figure 1 Left view of mining area 2. Detailed Implementation

[0021] The present invention will be further described below.

[0022] Liangbei Coal Mine of Xuchang Xinlong Mining Co., Ltd. is a typical "three-soft" coal seam mine, with coal seams ranging from -243 to -622 meters in depth. The coal seams are soft and powdery, with sandstone roofs showing a tendency to impact, and sandy mudstone or mudstone floor, making it a coal and gas outburst mine. During the excavation of the 21071 mining area, characterized by high gas content and deep burial, the adjacent 21051 mining face is being mined. The encounter between the mining face and the excavation face will cause a more complex stress distribution in the coal seam, thus bringing compound dynamic disaster risks to the excavation face. The 21051 East working face has an average strike length of 552 meters and a cut-off length of 209.5 meters, and is mined using fully mechanized mining in a single pass. The distance between the excavating machine roadway in the 21071 mining area and the bottom of the 21051 East working face is approximately 270 meters.

[0023] like Figure 1 and 2 As shown, the method of this invention is used to perform energy segmentation control on two working faces. The specific steps are as follows:

[0024] A. Select the treatment area location: First, determine the location of the roadway in mining area 21051 (i.e., mining area 1) and the location of the pre-excavation roadway in mining area 21071 (i.e., mining area 2). Based on the above locations, the coal seam area of ​​mining area 2 between the roadway of mining area 1 and the pre-excavation roadway of mining area 2 is determined as the treatment area.

[0025] B. Internal Division of the Treatment Area: Before the coal seam of Mining Area 1 has been mined and before the roadway of Mining Area 2 has begun to be excavated, the treatment area determined in step A is divided into four areas sequentially from Mining Area 1 to Mining Area 2: Area 1, Area 2, Area 3, and Area 4. Areas 1 through 4 are rectangular in shape and arranged side-by-side. Area 1 is closest to the roadway of Mining Area 1, and Area 4 is closest to the pre-excavated roadway of Mining Area 2. Areas 1 and 3 have the same area, each accounting for 42% of the treatment area, and are the largest of the four areas. Area 2 accounts for 10% of the treatment area, and Area 4 accounts for 6%. This allocation... The reasons are as follows: The first and third zones, as energy absorption zones, require the largest area. The second zone, an energy-splitting zone, will experience significant fragmentation after construction to effectively achieve energy splitting (i.e., the ability to effectively weaken the propagation of ground stress after fragmentation). However, the dense drilling in the second zone can easily loosen the coal seam, thus reducing stability; therefore, its area is smaller than the two energy absorption zones. The fourth zone, an energy resistance zone, has the smallest area because the energy it resists is minimal after absorption by the first to third zones. Its main function is to achieve coal seam support stability; therefore, during construction, it is only necessary to drill a row of cross-layer boreholes into the coal seam in this zone and inject hardening material for reinforcement. Furthermore, the above proportions ensure that the treated area achieves optimal energy splitting and absorption effects.

[0026] C. Construction and Treatment Zones: Following the division in step B, four zones will be constructed. Zones 1 and 3 will form energy absorption zones to absorb the ground stress energy and gas impact energy generated during subsequent mining and tunneling. Zone 2 will form an energy separation zone to separate the energy generated from the mining of Zone 1 and the energy generated from the tunneling of Zone 2, allowing the energy from the mining of Zone 1 to be absorbed through Zone 1, and the energy from the tunneling of Zone 2 to be absorbed through Zone 3. Zone 4 will form an energy resistance zone to resist the ground stress energy transmitted from Zone 1 after being weakened by the transition from Zone 1 to Zone 3, thereby enhancing the stability of the coal seam in Zone 2. The specific details of each zone are as follows: The construction process involves: hydraulic drilling in the first and third zones to unload the in-situ stress in the coal seam and simultaneously extract methane, releasing the stress and methane energy in both zones and making them energy absorption zones; denser hydraulic drilling in the second zone, ensuring the drilling density is at least twice that of the first and third zones, to unload the in-situ stress energy in this zone, reducing stress transmission to the underlying coal seam, and simultaneously extracting methane to lower the methane concentration to below 0.4%, making it an energy separation zone; and grouting reinforcement in the fourth zone to enhance coal seam stability and make it an energy resistance zone. The hydraulic drilling utilizes high-pressure water flow to drill through the coal seam, and the grouting reinforcement involves injecting materials with reinforcing structural properties, such as polyurethane or silicate cement, into the coal seam.

[0027] D. Simultaneous Mining of Two Working Faces: After completing step C, the mining of the coal seam in mining area 1 and the excavation of the roadway in mining area 2 begin simultaneously. At this time, most of the energy generated by the mining of mining area 1 is absorbed by the first area. The remaining energy is divided and absorbed by the second and third areas, and very little energy reaches the fourth area, where it is resisted, thus completing the energy buffering function of mining area 1. At the same time, the energy generated by the excavation of mining area 2 is weakened by the energy resistance zone and absorbed by the third area, with the remaining energy completing the energy buffering function in the second area. By dividing and absorbing the energy of mining areas 1 and 2 respectively, the in-situ stress energy and gas energy in the overall coal seam are separated and absorbed and buffered separately to reduce the risk of compound disasters. In addition, when mining area 1 is being mined, roof cutting and roadway retention are implemented to cut off the roof of the coal seam in the mined area, release the roof stress energy, and prevent the stress from being transmitted to the coal seam in mining area 2. At the same time, the roadway in mining area 1 is retained to resist the falling coal seam roof, thereby achieving safe mining of mining areas 1 and 2.

[0028] After implementing the above plan, the ground stress and gas outburst during the mining of the coal seam in mining area 21051 and the tunneling of the roadway in mining area 21071 were continuously monitored to determine whether a combined mine pressure and gas disaster would occur. After three months of monitoring, no combined mine pressure and gas disaster occurred, indicating that the implementation of the plan of this invention can effectively achieve energy separation between the two mining areas, thereby ensuring the safe mining of mining area 1 and mining area 2.

[0029] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for energy segmentation and control of complex disasters caused by the encounter of two working faces in a deep well, characterized in that, The specific steps are as follows: A. Select the treatment area location: First, determine the location of the roadway in mining area 1 and the pre-excavation roadway in mining area 2. Based on the above locations, the coal seam area in mining area 2 between the roadway in mining area 1 and the pre-excavation roadway in mining area 2 is determined as the treatment area. B. Internal Division of the Treatment Area: Before the coal seam of Mining Area 1 has been mined and before the roadway of Mining Area 2 has been excavated, the treatment area determined in step A is divided into four areas in sequence from Mining Area 1 to Mining Area 2: Area 1, Area 2, Area 3, and Area 4. Area 1 is closest to the roadway of Mining Area 1, and Area 4 is closest to the pre-excavated roadway of Mining Area 2. Area 1 and Area 3 have the same area and are the largest among the four areas. Area 2 has a larger area than Area 4. C. Construction and Treatment Zones: Following the division in step B, four zones will be constructed. Zones 1 and 3 will form energy absorption zones to absorb the ground stress energy and gas impact energy generated during subsequent mining and tunneling. Zone 2 will form an energy separation zone to separate the energy generated from the mining of Zone 1 and the energy generated from the tunneling of Zone 2, allowing the energy from the mining of Zone 1 to be absorbed through Zone 1, and the energy from the tunneling of Zone 2 to be absorbed through Zone 3. Zone 4 will form an energy resistance zone to resist the ground stress energy transmitted from Zone 1 after being weakened by the transition from Zone 1 to Zone 3, thereby enhancing the stability of the coal seam in Zone 2. The specific details of each zone are as follows: The construction process involves: hydraulic drilling in the first and third zones to unload the in-situ stress in the coal seam and simultaneously extract gas, releasing the in-situ stress and gas energy in both zones, making them energy absorption zones; hydraulic drilling is then intensified in the second zone, ensuring that the drilling density in this zone is at least twice that of the first and third zones, unloading the in-situ stress energy in the coal seam in this zone, reducing stress transmission to the underlying coal seam, and simultaneously extracting gas from the coal seam to reduce the gas concentration to below 0.4%, making it an energy separation zone; grouting reinforcement is then performed in the fourth zone to enhance the stability of the coal body, making it an energy resistance zone. D. Simultaneous mining of two working faces: After completing step C, the mining of the coal seam in mining area 1 and the excavation of the roadway in mining area 2 begin simultaneously. At this time, most of the energy generated by the mining of mining area 1 is absorbed by the first area. After the remaining energy is divided and absorbed by the second and third areas, very little energy reaches the fourth area and is resisted by the fourth area, thus completing the energy buffering function of mining area 1. At the same time, the energy generated by the excavation of mining area 2 is weakened by the energy resistance zone and absorbed by the third area. The remaining energy completes the energy buffering function in the second area. By dividing and absorbing the energy of mining area 1 and mining area 2 respectively, safe mining of mining area 1 and mining area 2 is achieved.

2. The method for energy segmentation and control of complex disasters caused by the encounter of two working faces in a deep well, as described in claim 1, is characterized in that... The first to fourth regions are all rectangular in shape and are arranged side by side.

3. The method for energy segmentation and control of complex disasters caused by encountering two working faces in a deep well, as described in claim 2, is characterized in that... In step B, the area of ​​the first region and the third region each accounts for 42% of the treated area; the area of ​​the second region accounts for 10% of the treated area; and the area of ​​the fourth region accounts for 6% of the treated area.

4. The method for energy segmentation and control of complex disasters caused by the encounter of two working faces in a deep well, as described in claim 1, is characterized in that... The hydraulic perforation is a process of using high-pressure water flow to perforate the coal seam, and the grouting reinforcement operation is the injection of materials with structural strengthening properties into the coal seam.

5. The method for energy segmentation and control of complex disasters caused by the encounter of two working faces in a deep well, as described in claim 1, is characterized in that... In step D, when mining area 1 is being mined, the roof is cut off and the roadway is left open. The roof of the coal seam in the mined area is cut off to release the stress energy of the roof and prevent the stress from being transmitted to the coal seam in mining area 2. At the same time, the roadway in mining area 1 is retained to resist the falling roof of the coal seam.

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