CN219387882U - Coal seam floor burst protection lane and high-efficient drainage collaborative construction structure of gas - Google Patents
Coal seam floor burst protection lane and high-efficient drainage collaborative construction structure of gas Download PDFInfo
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- CN219387882U CN219387882U CN202320670166.9U CN202320670166U CN219387882U CN 219387882 U CN219387882 U CN 219387882U CN 202320670166 U CN202320670166 U CN 202320670166U CN 219387882 U CN219387882 U CN 219387882U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The utility model provides a coal seam bottom plate burst protect lane and high-efficient drainage collaborative construction structure of gas, including the drilling site, the drilling site is arranged in the coal seam bottom plate rock lane, upward upwards bore on the rock lane roof of drilling site place towards the target release coal seam left and right sides and be equipped with a plurality of blast hole and drainage hole, the blast hole is radial arrangement with the drainage hole, the blast hole upwards bores in the bottom plate rock stratum of coal seam below 1 ~ 2m department, the drainage hole upwards passes the target release coal seam and bores 1 ~ 3m in the coal seam roof, blasting Kong Zina outwards divide into explosive filling section and hole sealing section. According to the utility model, the fracture guiding and compensating effects of the bottom plate layer blasting holes and the coal seam penetrating drainage holes can be used for forming a coal seam bottom plate blasting layer on the bottom plate layer, loosening coal and rock, increasing coal seam air permeability, improving gas drainage effect, and simultaneously generating blasting layers in the bottom plate layer below a target pressure relief coal seam and above a coal seam bottom plate rock roadway, so that impact ground pressure and high ground stress influence of the coal seam bottom plate rock roadway can be weakened.
Description
Technical Field
The utility model relates to the field of coal seam permeability improvement and rock burst prevention and control, in particular to a coal seam floor burst roadway protection and gas efficient extraction collaborative construction structure.
Background
Most of the coal mines in China belong to high-gas mines, the original coal seams are high in gas content, and the coal seams with poor coal seam air permeability occupy more than eight times, so that the current situation seriously influences the gas extraction effect, and the gas extraction rate and the extraction amount of the coal mines are restrained. As the depth of extraction increases, high ground stress causes more significant fracture closure in the coal body, making it difficult to service a complete extraction cycle. The problems of obvious increase of underground rock burst, complicated geological structure, poor coal seam air permeability, low gas extraction efficiency and the like of the mined coal seam are urgently needed to be solved, and the traditional permeability increasing technology, gas extraction technology or pressure relief technology cannot adapt to the high-stress underground environment with damaged cracks.
The coal seam permeability increasing method which is developed in China and applied to the site at present mainly comprises the technologies of hydraulic fracturing, hydraulic slotting, loosening blasting, deep hole presplitting blasting, rotary water jet reaming, high-pressure abrasive jet slotting, compound perforation and the like. The coal seam anti-reflection technology adopts a specific process to destroy the original structure of a coal body to generate cracks (gaps), but the mechanical property of coal determines that the cracks (gaps) generated in the coal seam are unstable and gradually closed under the action of dead weight stress, the shape of the cracks is short and wide, the anti-reflection range is small, and the potential safety hazard caused by rock burst of a bottom plate rock roadway of a rock stratum coal seam cannot be relieved, so that the existing coal seam anti-reflection technology and rock burst prevention technology still have a large improvement space.
In order to solve the problems of permeability increase and rock burst of a coal bed in deep mining of a low-permeability high-gas coal bed, a control technology capable of solving the comprehensive problems is urgently needed at present, and therefore, a coal bed bottom plate burst roadway protection and gas efficient extraction collaborative construction structure is provided.
Disclosure of Invention
The utility model aims to provide a coal seam floor burst protection roadway and gas high-efficiency extraction collaborative construction structure, which can form a coal seam floor burst layer on a floor rock layer through the crack guiding and compensating action of a floor rock layer burst hole and a coal seam penetrating drainage hole, loosen coal and rock, increase the air permeability of the coal seam and improve the gas extraction effect, and simultaneously generate burst layers in the floor rock layer below a target pressure relief coal seam and above the floor rock roadway of the coal seam, so that the impact of rock burst and high ground stress on the floor rock roadway of the coal seam can be weakened.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a coal seam bottom plate burst protect lane and high-efficient collaborative construction structure of taking out of gas, including the drilling site, the drilling site is arranged in the coal seam bottom plate rock lane, upward upwards bore on the rock lane roof of target release coal seam about being equipped with a plurality of blasthole and drainage hole towards the target release coal seam in proper order, blasthole and drainage hole are radial arrangement, blasthole upwards bore to the bottom plate rock stratum of coal seam below department 1 ~ 2m, the drainage hole upwards pass target release coal seam and bore 1 ~ 3m in the coal seam roof, blasting Kong Zina outwards divide into explosive filling section and hole sealing section, explosive filling section is filled with special pencil, hole sealing section is filled with stemming.
The diameter of the blasting holes is 50-100 mm, the diameter of the drainage holes is 75-120 mm, and the distance between the adjacent blasting holes and the distance between the adjacent drainage holes and the coal seam bottom plate is set to be 4-5 m.
The explosive loading section is aligned with a predetermined coal seam floor blast layer.
The number of the pumping holes is one more than that of the blasting holes, and each blasting hole is respectively positioned between two adjacent pumping holes.
By adopting the technical scheme, the collaborative construction method for burst protection of the coal seam floor and efficient gas extraction specifically comprises the following steps:
s1: collecting coal mine geological data, analyzing the geological conditions of a coal bed bottom plate above a coal bed bottom plate rock roadway, and determining lithology of a bottom plate rock stratum and a target pressure relief coal bed;
s2: preparing coal seam deep hole presplitting blasting working equipment;
s3: determining the layer position of the explosion layer of the bottom plate of the coal bed and the thickness of the explosion layer of the bottom plate of the coal bed according to the layer thickness of the target pressure-relief coal bed;
s4: arranging a drilling site in a coal seam floor rock roadway: drilling a blasting hole and a drawing hole;
s5: conveying the special medicine pipe from the blast hole to the design horizon of the blast layer of the coal seam floor;
s6: sealing holes of conventional stemming, and detonating after safety is confirmed;
s7: sealing the blast hole again, and performing conventional gas drainage through the drainage hole;
s8: and repeating the steps, communicating the blasting holes of each drilling site with the drainage holes, and starting to drain the gas from the mined coal seam.
The lithology of the floor strata in the step S1 is a necessary condition for deciding whether the coal seam floor burst roadway protection and gas efficient extraction collaborative construction structure is suitable for use or not; the hardness of the bottom plate rock stratum has a remarkable influence on the deep hole presplitting blasting effect: the higher the hardness of the floor strata, the more fully the fracture develops; conversely, the lower the hardness of the bottom plate rock layer is, the easier the rock mass is crushed, and under the action of explosion stress waves, the crushing ring formed by extremely crushing the rock mass around the blast hole can reduce the blasting impact action in a buffer mode, so that the further development of cracks is prevented; therefore, the higher the hardness of the floor strata is, the more suitable for the construction structure of the coal seam floor burst protection roadway and the gas efficient extraction, and the lithology characteristics of the floor strata are specifically shown in the following table:
from the table, if the bottom plate rock stratum is sandstone, the lithology is stable and the brittleness is high, then the radial cracks generated by the explosion stress wave and the cracks expanded by the wedge action of the gas are stable, the cracks are not easy to deform, the characteristics of the cracks are narrow and long, and the bottom plate explosion protection roadway and gas efficient extraction collaborative construction structure is suitable for the bottom plate explosion protection roadway of the coal bed.
The working equipment for deep hole pre-splitting blasting of the coal seam to be prepared in the step S2 comprises the following steps: special powder tube, blasting gel line, electric detonator, special stemming bag, hole packer, high-power blasting machine and blasting line;
wherein, the special medicine tube is manufactured under the coal mine; the length of the blasting gel line is at least 300 meters; each blast hole is provided with a section of millisecond delay electric detonator 2; stemming with granularity smaller than tide and certain fluidity is filled in the special stemming bag; the hole packer is provided with 30 rubber pipes and 30 exploratory holes; the blasting line is arranged from the detonation point to the blasting point;
the technical performance indexes of the special medicine tube are shown in the following table:
the specific method for determining the thickness of the coal seam floor blasting layer in the step S3 is as follows: by referring to the rule that the maximum expansion deformation amount after the exploitation of the protective layer is more than 3 per mill in the rules of preventing and controlling coal and gas outburst, the thickness of the explosion layer of the coal bed bottom plate, namely the length of the explosion hole charging section, is designed, so that the expansion deformation amount of the coal bed top plate which is the farthest from the explosion layer of the coal bed bottom plate in a vertical way is more than 3 per mill, and the minimum deformation amount occurs at the position of the coal bed top plate due to the minimum dead weight effect of the coal bed top plate compared with the coal body below the coal bed top plate and the attenuation in the propagation process of the explosion waves and explosion stress waves, thereby ensuring that the whole coal bed meets the rule that the deformation amount is more than 3 per mill;
the displacement monitor is arranged on the coal seam roof to acquire the displacement of the coal seam roof, so that the thickness design of the blasting layer of the bottom plate of the coal seam is ensured, and the expansion deformation displacement of the coal seam roof can reach 3 per mill of the thickness of the coal seam.
The step S4 specifically comprises the following steps: according to the lithology of the actual coal seam floor and the parameters of the special medicine pipe, determining the radius of a fracture ring of blasting Kong Weiyan, arranging a drilling field on the coal seam floor rock roadway, alternately drilling a plurality of blasting holes and drainage holes upwards and leftwards towards a target pressure-relief coal seam on the rock roadway roof, arranging the blasting holes and the drainage holes in a radial arrangement, wherein the diameter of each blasting hole is 50-100 mm, drilling the blasting holes to the position below the coal seam, the diameter of each drainage hole is 75-120 mm, the drainage holes penetrate through the target pressure-relief coal seam and drill to the position in the coal seam roof by 1-3 m, the outermost sides of the left side and the right side of the drilling field are designed to be drainage holes, and according to the radiation range of the fracture region, which is influenced by blasting impact, of the fracture region of the blasting layer is utilized to the greatest extent, and the distance between the adjacent blasting holes and the drainage holes extending to the coal seam floor is designed to be 4-5 m.
The step S5 specifically comprises the following steps: the hole is detected by the hole detecting tube before the powder filling, in order to avoid hole collapse, the special powder tube is immediately filled into the blast holes according to the threads of the special powder tube after the hole detecting tube is just pulled out, each blast hole is firstly provided with two electric detonators with one section of millisecond and two gun heads respectively by using colloid wires for blasting, and the gun heads are fixed by using adhesive tapes, so that the detonator foot wires and bus bars are prevented from falling off due to friction between the tube and the hole wall, and the detonator is broken and short-circuited. After the special pipe is sent to the designed layer of the explosion layer of the coal seam floor from the explosion hole, the explosive filling section 7 is aligned with the preset explosion layer of the coal seam floor, so that coal cracks are fully developed, and the thickness of the explosion layer of the coal seam floor is designed according to the layer and the thickness of the explosion layer of the coal seam floor determined in the step S3, so that the filling length is determined, and then the thicker the target pressure relief coal seam is, the longer the explosive filling section is, and the position and the length of the explosive filling section can control the layer and the thickness of the explosion layer of the coal seam floor.
The step S6 specifically comprises the following steps: and (3) mounting the special stemming bag from the tail end of the explosive filling section to the orifice of the blasting hole from the inside of the blasting hole to form a hole sealing section, connecting an electric detonator with a high-power blasting machine by a blasting large line, detonating after safety confirmation, checking whether rock debris is ejected from the orifice of the adjacent pumping hole after blasting, ensuring the penetration between the blasting hole and the pumping hole, and forming a stable gas migration channel.
The step S7 specifically comprises the following steps: and hole sealing is carried out on the blastholes after blasting is completed by using the hole packer, so that gas is prevented from being communicated with a coal bed floor rock roadway through the blastholes after the drainage holes are connected with negative pressure, the gas tightness of a subsequent gas drainage loop is ensured, and conventional gas drainage is carried out through the pressure relief cracks of the coal bed and the blasting cracks of the floor rock stratum by using the drainage hole flowtube.
Compared with the prior art, the utility model has substantial characteristics and progress, in particular to the utility model, the explosive charging section of the blast hole is selected in the bottom plate rock stratum, thereby not only ensuring the integrity of the support of the coal seam roof, but also forming the blast layer below the coal seam, relieving the rock burst, simultaneously enabling the coal seam to communicate with the bottom plate rock stratum up and down, and increasing the migration channel of the coal seam gas when the coal seam is extracted under negative pressure.
In order to fully develop the coal body cracks, the utility model can select enough floor rock stratum breaking thickness according to the coal seam thickness, namely, the thicker the coal seam is, the longer the explosive filling section is; the blasting layer position of the coal bed bottom plate is determined by the position of the blasting hole charging section, and the blasting layer can be generated in the bottom plate rock layer below the target pressure relief coal bed and above the coal bed bottom plate rock roadway, so that the impact of rock burst and high ground stress suffered by the coal bed bottom plate rock roadway is reduced, the stability of the coal bed bottom plate rock roadway is improved, the coal bed bottom plate rock roadway is protected, and the production safety of a mine is ensured.
According to the utility model, the number of the extraction holes is one more than that of the blasting holes, each blasting hole is respectively positioned between two adjacent extraction holes, namely, the outermost drilling holes at the left side and the right side of a drilling site are designed as the extraction holes, so that the extraction holes at the two sides of the blasting holes are ensured to exert a crack guiding effect.
According to the utility model, the crack generated by the explosion of the bottom plate rock stratum can develop towards the drainage hole by utilizing the guiding and compensating actions of the explosion energy of the special medicine tube and the drainage hole, so that a gas migration stable channel is formed, the coal bed bottom plate forms a blasting layer after pre-splitting explosion, and the target pressure relief coal bed is subjected to explosion stress disturbance and downward breaking and sedimentation under the action of the target pressure relief coal bed to relieve pressure so as to generate the crack, so that the drainage hole flower tube can perform gas extraction through the coal bed pressure relief crack and the rock stratum blasting crack, the gas migration path is increased, and the gas extraction effect is improved.
In summary, the utility model can form the coal bed floor blasting layer on the floor rock layer through the crack guiding and compensating action of the floor rock layer blasting holes and the coal bed penetrating drainage holes, loosens coal and rock, increases the coal bed air permeability, improves the gas drainage effect, and simultaneously generates blasting layers in the floor rock layer below the target pressure relief coal bed and above the coal bed floor rock roadway, so that the impact of rock burst and high ground stress on the coal bed floor rock roadway can be weakened.
Drawings
Fig. 1 is a schematic diagram of deep hole pre-splitting blasting construction of a coal seam floor of the present utility model.
Fig. 2 is a schematic diagram of a coal seam floor rock roadway drilling arrangement in accordance with the present utility model.
FIG. 3 is a schematic view of the fracture zone created by adjacent blastholes and draw holes of the present utility model.
Fig. 4 is a schematic representation of a blasting Kong Zhayao loading segment charge of the present utility model.
Detailed Description
Embodiments of the present utility model are further described below with reference to the accompanying drawings.
As shown in fig. 1-4, the collaborative construction structure for burst protection of a coal seam floor and efficient gas extraction comprises a drilling field, wherein the drilling field is arranged in a coal seam floor rock roadway 1, a plurality of blasting holes 5 and extraction holes 6 are alternately drilled on a rock roadway roof 10 at the position of the drilling field towards left and right of a target pressure relief coal seam 3 upwards, the blasting holes 5 and the extraction holes 6 are arranged in a radial arrangement, the blasting holes 5 upwards drill into a floor rock layer 2 at the position of 1-2 m below the coal seam, the extraction holes 6 upwards penetrate through the target pressure relief coal seam 3 and drill into the coal seam roof 9 for 1-3 m, the blasting holes 5 are divided into an explosive filling section 7 and a hole sealing section 8 from inside to outside, the explosive filling section 7 is filled with special medicine tubes, and the hole sealing section 8 is filled with stemming.
The diameter of the blasting holes 5 is 50-100 mm, the diameter of the drainage holes 6 is 75-120 mm, and the distance between the adjacent blasting holes 5 and the distance between the adjacent drainage holes 6 and the coal seam floor are 4-5 m.
The explosive loading section 7 is aligned with a predetermined coal seam floor blast layer.
The number of the extraction holes 6 is one more than the number of the blastholes 5, and each blasthole 5 is respectively positioned between two adjacent extraction holes 6.
By adopting the technical scheme, the collaborative construction method for burst protection of the coal seam floor and efficient gas extraction specifically comprises the following steps:
s1: collecting coal mine geological data, analyzing the geological conditions of the coal bed floor above the coal bed floor rock roadway 1, and determining lithology of the floor rock stratum 2 and the target pressure relief coal bed 3;
s2: preparing coal seam deep hole presplitting blasting working equipment;
s3: determining the layer position of the coal bed bottom plate blasting layer 4 and the thickness of the coal bed bottom plate blasting layer 4 according to the layer thickness of the target pressure relief coal bed 3;
s4: arranging a drilling site in a coal seam floor rock roadway 1: drilling a blasting hole 5 and a drawing hole 6;
s5: the special medicine pipe is sent to the design horizon of the coal seam floor blasting layer 4 from the blasting holes 5;
s6: sealing holes of conventional stemming, and detonating after safety is confirmed;
s7: sealing the explosion hole 5 again to avoid the gas extraction loop to be communicated with the coal seam bottom plate rock roadway 1 through the explosion hole 5, and performing conventional gas extraction through the extraction hole 6;
s8: and repeating the steps, communicating the blasting holes 5 and the drainage holes 6 of each drilling site, and starting to drain the gas from the mined coal seam.
The lithology of the floor strata 2 in the step S1 is a necessary condition for deciding whether the coal seam floor burst roadway protection and gas efficient extraction collaborative construction structure is suitable for use or not; the hardness of the floor strata 2 has a significant effect on the deep hole pre-splitting blasting effect: the higher the hardness of the floor strata 2, the more fully the fracture develops; conversely, the lower the hardness of the floor rock layer 2 is, the easier the rock mass is crushed, and under the action of explosion stress waves, the crushing ring formed by extremely crushing the rock mass around the blast hole 5 can reduce the blasting impact action in a buffer mode, thus preventing the further development of cracks; therefore, the higher the hardness of the floor strata 2 is, the more suitable for the construction structure of the coal seam floor burst roadway protection and gas efficient extraction, and the lithology characteristics of the floor strata 2 are specifically shown in the following table:
from the above table, if the floor rock layer 2 is sandstone, the lithology is stable and the brittleness is large, the radial cracks generated by the explosion stress wave and the cracks expanded by the wedge action of the gas are stable and are not easy to deform, and the crack features are narrow and long, so that the coal seam floor burst protection roadway and gas efficient extraction collaborative construction structure is suitable.
The working equipment for deep hole pre-splitting blasting of the coal seam to be prepared in the step S2 comprises the following steps: special powder tube, blasting gel line, electric detonator, special stemming bag, hole packer, high-power blasting machine and blasting line;
wherein, the special medicine tube is manufactured under the coal mine; the length of the blasting gel line is at least 300 meters; each blast hole 5 is provided with a section of millisecond delay electric detonator 2; stemming with granularity smaller than tide and certain fluidity is filled in the special stemming bag; the hole packer is provided with 30 rubber pipes and 30 exploratory holes; the blasting line is arranged from the detonation point to the blasting point;
the technical performance indexes of the special medicine tube are shown in the following table:
the specific method for determining the thickness of the coal seam floor blasting layer 4 in the step S3 is as follows: by referring to the provision that the maximum expansion deformation amount after the exploitation of the protective layer is greater than 3 per mill in the rules of preventing and controlling coal and gas outburst, the thickness of the explosion layer of the coal bed bottom plate, namely the length of the explosive section of the explosion hole 5, is designed, so that the expansion deformation amount of the coal bed top plate 9 which is the farthest from the explosion layer of the coal bed bottom plate is greater than 3 per mill, and the minimum deformation amount occurs at the position of the coal bed top plate 9 due to the minimum dead weight effect of the coal bed top plate 9 compared with the coal body below the coal bed top plate 9 and the attenuation in the propagation process of the explosion wave and the explosion stress wave, thereby ensuring that the whole coal bed meets the provision that the deformation amount is greater than 3 per mill;
the displacement monitor is arranged on the coal seam roof 9 to acquire the displacement of the coal seam roof 9, so that the thickness design of the blasting layer of the bottom plate of the coal seam is ensured, and the expansion deformation displacement of the coal seam roof 9 can reach 3 per mill of the thickness of the coal seam.
The step S4 specifically comprises the following steps: according to the lithology of the actual coal seam floor and the parameters of the special medicine pipes, the radius of a fracture ring of surrounding rock of the blastholes 5 is determined, a drilling field is arranged in a coal seam floor rock roadway 1, a plurality of blastholes 5 and drainage holes 6 are alternately drilled on a rock roadway roof 10 towards a target pressure relief coal seam 3, the blastholes 5 and the drainage holes 6 are arranged in a radial arrangement, the diameter of each blasthole 5 is 50-100 mm, the blastholes are drilled below the coal seam for 1-2 m, the diameter of each drainage hole 6 is 75-120 mm, each drainage hole 6 penetrates through the target pressure relief coal seam 3 to be drilled into the coal seam roof 9 for 1-3 m, the outermost sides of the left side and the right side of the drilling field are designed to be the drainage holes 6, according to the radiation range of a fracture area generated by the impact of blasting of the rock stratum, the distance between the adjacent blastholes 5 and the drainage holes 6 extending to the coal seam floor is designed to be 4-5 m to the greatest extent.
The step S5 specifically comprises the following steps: the hole is detected by the hole detecting tube before the explosive loading, in order to avoid hole collapse, the special explosive tube is immediately loaded into the explosion hole 5 according to the threads of the special explosive tube, one tube by one tube when the hole detecting tube is just pulled out, each explosion hole is firstly provided with two explosion heads respectively by two electric detonators with one section of millisecond and a colloid wire for blasting, and the explosion heads are fixed by adhesive tapes, so that the detonator is prevented from being broken and short-circuited due to the fact that the detonator leg wire and a bus are separated by friction between the tube and the hole wall. After the special pipe is sent to the design level of the coal seam floor blasting layer 4 from the blasting holes 5, the explosive filling section 7 is aligned with the preset coal seam floor blasting layer, and in order to enable the coal body cracks to fully develop, the sufficient thickness of the coal seam floor blasting layer is designed according to the level and the thickness of the coal seam floor blasting layer 4 determined in the step S3, so that the charging length is determined, and then the thicker the target pressure relief coal seam 3 is, the longer the explosive filling section 7 is, and the position and the length of the explosive filling section 7 can control the level and the thickness of the coal seam floor blasting layer 4.
The step S6 specifically comprises the following steps: and (3) mounting the special stemming bag from the tail end of the explosive loading section 7 to the orifice of the blasting hole 5 from the inside of the blasting hole 5 to form a hole sealing section 8, connecting an electric detonator with a high-power blasting machine by a blasting large line, detonating after safety is confirmed, checking whether rock debris is ejected from the orifice of the adjacent extraction hole 6 after blasting, ensuring the penetration between the blasting hole 5 and the extraction hole 6, and forming a stable gas migration channel.
The step S7 specifically comprises the following steps: and hole packer is used for sealing the blasthole 5 after blasting is completed, so that gas is prevented from being communicated with the coal seam floor rock roadway 1 through the blasthole 5 after the drainage hole 6 is connected with negative pressure, the gas tightness of a subsequent gas drainage loop is ensured, and the drainage hole 6 flower pipe is used for carrying out conventional gas drainage through the coal seam pressure relief crack and the floor rock stratum 2 blasting crack.
According to the utility model, the charging section of the blast hole 5 is selected in the bottom plate rock layer 2, so that the integrity of the support of the coal seam roof 9 is ensured, a blasting layer is formed below the coal seam, the rock burst is relieved, the coal seam and the bottom plate rock layer 2 are communicated up and down, and the migration channel of the coal seam gas under the negative pressure extraction is increased.
In order to fully develop the coal body cracks, the utility model can select enough crushing thickness of the floor rock layer 2 according to the thickness of the coal layer, namely, the thicker the coal layer is, the longer the explosive filling section 7 is; the layer position of the blasting layer 4 of the bottom plate of the coal bed is determined by the position of the charging section of the blasting hole 5, and the blasting layer can be generated in the bottom plate rock layer 2 below the target pressure relief coal bed 3 and above the bottom plate rock roadway 1 of the coal bed, so that the impact of rock burst and high ground stress on the bottom plate rock roadway 1 of the coal bed is reduced, the stability of the bottom plate rock roadway 1 of the coal bed is improved, the bottom plate rock roadway 1 of the coal bed is protected, and the production safety of a mine is ensured.
According to the utility model, the number of the extraction holes 6 is one more than that of the blasting holes 5, each blasting hole 5 is respectively positioned between two adjacent extraction holes 6, namely, the outermost drilling holes on the left side and the right side of a drilling site are designed to be the extraction holes 6, so that the extraction holes 6 on the two sides of the blasting holes 5 are ensured to play a crack guiding role.
According to the utility model, the crack generated by blasting of the floor strata 2 can develop towards the drainage hole 6 by utilizing the energy of explosion of the special medicine tube and the guiding and compensating effects of the drainage hole 6 to form a gas migration stable channel, the coal seam floor is presplitting blasted to form a blasted layer, the target pressure relief coal seam 3 is subjected to the disturbance of explosion stress and downward breaking and sedimentation under the action of the target pressure relief coal seam to release the pressure to generate the crack, so that the pipe of the drainage hole 6 can perform gas extraction through the pressure relief crack of the coal seam and the blasted crack of the strata, the gas migration path is increased, and the gas extraction effect is improved.
In summary, the utility model can form the coal seam floor blasting layer 4 on the floor rock layer 2 through the crack guiding and compensating action of the blasting holes 5 of the floor rock layer 2 and the coal seam penetrating drainage holes 6, loosens coal and rock, increases the air permeability of the coal seam, improves the gas extraction effect, and simultaneously generates the blasting layer in the floor rock layer 2 below the target pressure relief coal seam 3 and above the coal seam floor rock roadway 1, so that the impact of rock burst and high-ground stress on the coal seam floor rock roadway 1 can be weakened.
The above embodiments are merely for illustrating the technical aspects of the present utility model, and it should be understood by those skilled in the art that the present utility model is described in detail with reference to the above embodiments; modifications and equivalents may be made thereto without departing from the spirit and scope of the utility model, which is intended to be encompassed by the claims.
Claims (4)
1. The utility model provides a coal seam bottom plate burst protect roadway and high-efficient drainage collaborative construction structure of gas which characterized in that: the explosion-proof and pressure-relief coal mine drilling device comprises a drilling field, wherein the drilling field is arranged in a coal seam floor rock roadway, a plurality of explosion holes and drainage holes are alternately drilled on a rock roadway roof at the position of the drilling field towards the left and right of a target pressure-relief coal seam, the explosion holes and the drainage holes are radially arranged, the explosion holes are drilled upwards into a floor rock stratum at the position 1-2 m below the coal seam, the drainage holes upwards penetrate through the target pressure-relief coal seam and are drilled into the coal seam roof for 1-3 m, the explosion Kong Zina is outwards divided into an explosive filling section and a hole sealing section, the explosive filling section is filled with special explosive tubes, and the hole sealing section is filled with stemming.
2. The coal seam floor burst roadway protection and gas efficient extraction collaborative construction structure according to claim 1, which is characterized in that: the diameter of the blasting holes is 50-100 mm, the diameter of the drainage holes is 75-120 mm, and the distance between the adjacent blasting holes and the distance between the adjacent drainage holes and the coal seam bottom plate is set to be 4-5 m.
3. The coal seam floor burst roadway protection and gas efficient extraction collaborative construction structure according to claim 1, which is characterized in that: the explosive loading section is aligned with a predetermined coal seam floor blast layer.
4. The coal seam floor burst roadway protection and gas efficient extraction collaborative construction structure according to claim 1, which is characterized in that: the number of the pumping holes is one more than that of the blasting holes, and each blasting hole is respectively positioned between two adjacent pumping holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320670166.9U CN219387882U (en) | 2023-03-30 | 2023-03-30 | Coal seam floor burst protection lane and high-efficient drainage collaborative construction structure of gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320670166.9U CN219387882U (en) | 2023-03-30 | 2023-03-30 | Coal seam floor burst protection lane and high-efficient drainage collaborative construction structure of gas |
Publications (1)
| Publication Number | Publication Date |
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| CN219387882U true CN219387882U (en) | 2023-07-21 |
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| CN202320670166.9U Active CN219387882U (en) | 2023-03-30 | 2023-03-30 | Coal seam floor burst protection lane and high-efficient drainage collaborative construction structure of gas |
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| CN (1) | CN219387882U (en) |
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2023
- 2023-03-30 CN CN202320670166.9U patent/CN219387882U/en active Active
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