CN113847031A - Method for maintaining stability of down-going paste filling surrounding rock of coal pressed under water body - Google Patents
Method for maintaining stability of down-going paste filling surrounding rock of coal pressed under water body Download PDFInfo
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- CN113847031A CN113847031A CN202111195434.8A CN202111195434A CN113847031A CN 113847031 A CN113847031 A CN 113847031A CN 202111195434 A CN202111195434 A CN 202111195434A CN 113847031 A CN113847031 A CN 113847031A
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- 239000003245 coal Substances 0.000 title claims abstract description 265
- 239000011435 rock Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 238000005065 mining Methods 0.000 claims abstract description 86
- 230000005641 tunneling Effects 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000011084 recovery Methods 0.000 claims abstract description 5
- 238000000605 extraction Methods 0.000 claims abstract description 3
- 238000005516 engineering process Methods 0.000 claims description 9
- 230000035515 penetration Effects 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 239000002023 wood Substances 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 7
- 230000006641 stabilisation Effects 0.000 claims 1
- 238000011105 stabilization Methods 0.000 claims 1
- 230000008093 supporting effect Effects 0.000 abstract description 13
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 5
- 239000000945 filler Substances 0.000 abstract description 2
- 239000010878 waste rock Substances 0.000 abstract 2
- 239000002699 waste material Substances 0.000 description 6
- 230000006378 damage Effects 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000006210 lotion Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
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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
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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Abstract
The invention relates to a method for maintaining stability of surrounding rock filled with coal pressing downward paste under water, which is characterized in that a single hydraulic prop is arranged to actively support the surrounding rock on the top plate in a strip goaf, so that a filler can actively support the surrounding rock on the top plate, and original uncontrollable sinking is reduced or even overcome; by removing part of the loose area and reserving the loose area with a certain width, the overlying strata control effect can be improved, and the strip coal pillar extraction roadway is ensured to be beneficial to tunneling and supporting; arranging a recovery roadway of a lower coal seam below the middle part of the recovered strip coal pillars of the upper coal seam for releasing stress, so as to be beneficial to tunneling and maintenance; the filling through hole is arranged to simplify the engineering quantity of a filling pipeline, reduce the mining and filling interference of the lower coal seam and enable the mining speeds of the upper coal seam and the lower coal seam to be matched as much as possible; by adopting oblique mining, the throwing speed of the gangue and the flowing speed of the paste are improved, so that the paste material is completely propped; and the waste rock filling and the paste filling are mixed, so that the waste rock does not need to be put into a well, special crushing is not needed, the environment is protected, and the workload is simplified.
Description
Technical Field
The invention relates to the field of filling mining during coal pressing under water in a coal mine, in particular to a method for maintaining stability of surrounding rock filled with paste downward of coal pressing under water.
Background
The geological conditions of coal mining areas in China are complex, and various geological disasters such as roof disasters, ground subsidence, gas explosion and dissipation, underground water level reduction and pollution, water burst and sand collapse, spontaneous combustion of coal beds and coal gangue hills and the like are high in risk in the coal mining process, and the main occurrence source of environmental pollution of the mining areas is also provided. And most coal mines in China have the problem of coal pressing under buildings, water bodies and railways, the east coal mine faces the threat of a fourth loose aquifer, coal mining causes mine water inrush and sand collapse, the life safety of miners is damaged, underground water resources are damaged and lost, and ground surface water damage, vegetation degradation, building deformation damage and other hazards are caused by ground surface collapse after mining.
Coal usually exists underground in a multilayer form, and the coal is usually mined under the condition of an upper layer and a lower layer, wherein an upward mining mode, namely mining from bottom to top, can be adopted during mining, and a downward mining mode, namely mining from top to bottom can also be adopted during mining. For the situation of simultaneously facing coal pressing under a water body, including ground river coal pressing and loose layer aquifer coal pressing, a traditional old mine only adopts one layer of coal according to working conditions such as coal quality, thickness, buried depth and the like, and adopts a strip mining mode to control deformation of surrounding rocks and maintain stability of the surrounding rocks, but in the later stage of mine existence, the residual coal is required to be recovered urgently to prolong the service life of the mine. The filling coal mining technology is an important component of a green mining system, can control the movement deformation and the surface subsidence of overlying strata, can fully utilize solid waste materials generated in the coal mining and washing processes, and protects the ecological environment of a mining area; the mining method is a currently common mining method for three-pressing coal under water, but the existing filling mining technology is generally used for a longwall/shortwall working face and is mostly used for a single coal seam, or is only used for recovering strip coal pillars in strip mining, and a good reference is not provided for a filling scheme under the condition that upper and lower coal layers and one coal layer adopt strip mining.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for maintaining stability of surrounding rock filled with coal paste downward under water body under pressure, which comprises an upper coal seam and a similar unexplored lower coal seam which are mined in a dip stripe mining mode, and comprises the following specific steps:
s1, for the upper coal seam, arranging a mining area preparation roadway at the inclined upper part of the mining area, and recovering strip coal pillars in a single-wing retreating mode;
for the lower coal seam, arranging a mining area preparation roadway at the inclined upper part of the mining area, and adopting single-wing retreat mining;
s2, erecting single hydraulic props at intervals along the inclination in the strip goaf, and jacking the single hydraulic props to support the roof surrounding rocks which are deflected; then, replacing a single hydraulic prop with a wood prop;
constructing filling cross-layer holes at intervals along the inclination in the strip goaf, and constructing the hole bottoms of the filling cross-layer holes to the top plate surrounding rock of the lower coal seam;
preferably, in step S2, the hydraulic prop, the wood prop and the filling perforation are arranged in a row at intervals along the inclination.
S3, removing the loose coal bodies on the side of the strip coal pillar close to the strip mining area, and simultaneously keeping the loose coal bodies with a certain width;
preferably, the width of the upper coal bed paste filling body is not less than the width of the stripe coal pillar.
Preferably, the width of the slack coal body can be obtained based on a progressive destruction theory or can be obtained through actual detection.
S4, connecting one end of a filling branch pipe with a filling penetration hole, and abutting the other end against the loose coal body reserved part on one side; filling the strip goaf and the loose coal clearing parts at two sides of the strip goaf from bottom to top by using paste filling materials;
preferably, in step S4, when the strip goaf is filled with the paste filling material, the strip goaf is continuously filled with underground excavation gangue.
S5, after the upper coal seam paste filling body is stabilized, tunneling a strip coal pillar stoping roadway along the remaining part of the loose coal body, laying a lower coal seam filling main pipe in the strip coal pillar stoping roadway on one side, connecting the lower coal seam filling main pipe with filling branch pipes one by one, and arranging connecting valves one by one; the cut holes are communicated with the strip coal pillar stoping roadways on the two sides, and then the strip coal pillars are recovered;
preferably, the strip coal pillar can be recovered by adopting a short-wall mode.
Preferably, the width of the loose coal body retaining part is less than or equal to the width of the strip coal pillar mining roadway.
S6, lagging the recovery progress of the upper coal seam stripe coal pillar, digging a lower coal seam working face stoping roadway in the lower coal seam, wherein two stoping roadways of the same working face of the lower coal seam are respectively positioned below the middle parts of two adjacent stripe coal pillars of the upper coal seam;
preferably, the mining width of the working face of the lower coal seam is the sum of the widths of the stripe coal pillars and the stripe goaf of the upper coal seam.
S7, adopting longwall upward mining on the lower coal seam working face, opening corresponding valves on corresponding filling branch pipes when filling penetration holes leak to the goaf of the lower coal seam working face, and injecting paste filling materials into the goaf of the lower coal seam working face;
preferably, when the paste filling material is used for filling the goaf of the working face of the lower coal seam, the paste filling material is continuously filled into the goaf and underground tunneling gangue is continuously filled into the goaf.
S8, performing tunneling work of one stoping roadway of the next working face of the lower coal seam by adopting a gob-side tunneling technology, and tunneling the other stoping roadway of the next working face by adopting a conventional mode;
and S9, circulating the steps until the coal seam is mined.
Has the advantages that: according to the invention, the working surface is arranged along the inclination, and a single-wing face-up mining scheme is adopted, so that the reserved quantity of protective coal pillars can be saved when a mining area preparation roadway is arranged at a shallow buried depth position, and the stability control effect of surrounding rocks is improved; carry out initiative support to the roof country rock in strip collecting space area through setting up hydraulic prop for go up coal seam lotion obturator and also can produce the initiative support to the roof country rock, reduce and overcome former uncontrollable sinking even, go up the width of coal seam lotion obturator and be not less than the width of strip coal pillar simultaneously, guarantee to adopt and stay the proportion, guarantee to roof country rock supporting effect. By removing part of the slack zone, reserving the slack zone with a certain width and enabling the width of the slack zone to be smaller than or equal to the width of the strip coal pillar mining roadway, the width of the upper coal seam paste filling body can be improved, the overlying strata control effect is improved, and the strip coal pillar mining roadway is beneficial to tunneling, supporting and maintaining. And arranging a stoping roadway of the lower coal seam below the middle part of the recovered strip coal pillars of the upper coal seam for stress release, so that the tunneling and the maintenance are facilitated. The filling penetration holes are arranged, so that a paste filling system of the lower coal seam and the upper coal seam can be arranged together, the work amount of filling pipelines is simplified, the interference of paste filling on the mining work of the lower coal seam can be reduced, the mining efficiency of the lower coal seam is improved, and the mining speeds of the upper coal seam and the lower coal seam are matched as much as possible; creatively proposes that the waste filling and the paste filling are mixed, so that the tunneling waste/underground waste is not loaded into the well, special crushing is not needed, and only the transportation requirement is met. The upper coal seam and the lower coal seam adopt an upward and oblique mining mode simultaneously, so that the throwing speed of the gangue and the flowing speed of the paste material are greatly improved, and the paste material can be completely propped. And the mining roadway of the next working face of the lower coal seam constructed by adopting the gob-side entry driving technology is beneficial to the driving, supporting and maintenance of the roadway.
Specific advantageous effects can be seen in the detailed description section.
Drawings
Fig. 1 is a plan layout diagram of the method for maintaining stability of the descending paste filling surrounding rock, wherein the upper diagram is the arrangement condition of an upper coal layer, and the lower diagram is the corresponding arrangement condition of a lower coal layer right below the upper coal layer.
In the figure: the left and right are trends, the upper and lower are trends, and the buried depth is shallow at the upper part and deep at the lower part; the method comprises the following steps that an upper coal seam 1, a lower coal seam 2, a strip coal pillar 3, a strip goaf 4, a single hydraulic prop 5, a wood prop 6, a loose coal body removing part 7, a loose coal body retaining part 81, a strip coal pillar stoping roadway 8, an upper coal seam paste filling body 9, a lower coal seam working face stoping roadway 10, a coal pillar goaf 11, a filling penetration hole 12, a lower coal seam working face 13, a lower coal seam paste filling body 14, a stoping roadway 15 adopting a gob-side entry driving technology for a lower coal seam working face, and a stoping roadway 16 adopting a conventional excavation mode for the lower coal seam working face;
Detailed Description
The technical solution of the present invention is described in more detail below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1, a method for stabilizing surrounding rock filling by downward paste filling of water body pressed coal comprises an upper coal layer 1 which is mined in a dip stripe mining mode and a lower coal layer 2 which is not mined, wherein the distances between the two coal layers are close, the coal pressing condition under the water body exists, the surrounding rock is controlled to be stable by mining in the downward paste filling mode, and water inrush and sand inrush are prevented, and the method comprises the following specific steps:
s1, for the upper coal seam 1, arranging a mining area preparation roadway at the inclined upper part (not shown in the figure) of the mining area, and recovering the strip coal pillar 3 in a single-wing retreating mode (namely, upward mining, and mining the strip coal pillar of the upper coal seam from bottom to top along the inclination);
for the lower coal seam 2, arranging a mining area preparation roadway at the inclined upper part (not shown in the figure) of the mining area, and adopting single-wing backward mining (namely, upward mining, and performing mining on the working surface of the lower coal seam from bottom to top along the inclination);
has the advantages that: so arrange the purpose in mining area and leave the protection coal pillar that the mining area prepared the tunnel and locate shallow buried depth position, can practice thrift the protection coal pillar on the one hand and leave and establish the volume, because top (shallow buried depth position) itself will leave and be equipped with a certain amount of waterproof safe coal pillar during strip mining, on the other hand, prepare the tunnel protection coal pillar with the mining area and leave and establish in shallow buried depth position, it is few to leave and establish the volume, and the protection coal pillar after leaving and establishing is effectual to the stable control of country rock.
S2, supporting single hydraulic props 5 in the strip gob 4 along a trend from bottom to top at intervals, and jacking the single hydraulic props 5 to support the roof surrounding rocks which are bent, so that the bending is reduced or even eliminated; then, the single hydraulic prop 5 is replaced by a wood prop 6 (in fig. 1, the single hydraulic prop 5 and the wood prop 6 are shown to be at the same position, and actually, the two are arranged in close proximity);
constructing filling cross-bedding holes 12 in the strip goaf 4 at intervals along the inclination from bottom to top, and constructing the hole bottoms of the filling cross-bedding holes 12 to the top plate surrounding rocks of the lower coal seam 2;
preferably, in step S2, the hydraulic pillars 5/wooden pillars 6 and/or the through-filling holes 12 are arranged in rows with a plurality of rows (only 1 hydraulic pillar 5/ wooden pillar 6 and 3 through-filling holes 12 are shown in each row in fig. 1).
Has the advantages that: although the roof surrounding rock after strip mining does not collapse, the roof surrounding rock still bends to be analyzed along a two-dimensional space of the trend, the roof surrounding rock of the strip goaf 4 can be regarded as a beam, supporting points on two sides of the roof surrounding rock/beam are strip coal pillars 3, and if paste materials are directly filled into the strip goaf 4, the deflection of the roof surrounding rock/beam cannot be overcome; forming a coal pillar goaf 11 after recovering the adjacent stripe coal pillars 3, wherein roof surrounding rocks above the coal pillar goaf 11 form a beam, and upper coal layer paste fillers 9 on two sides are supporting points; when the banded coal pillars 3 are recovered, the roof surrounding rock above the banded coal pillars sinks uncontrollably to some extent at once, because the heights of the supporting points (upper coal layer paste filling bodies) on the two sides are lower than those of the previous supporting points (banded coal pillars), and the roof surrounding rock/beam above the coal pillar goaf 11 is firstly lowered to the heights of the supporting points (upper coal layer paste filling bodies) on the two sides and then continuously deflects. The single hydraulic prop 5 is arranged to actively support the roof surrounding rock of the strip goaf 4, and the wood prop 6 is adopted for replacement, so that deflection is reduced or even eliminated, the subsequent upper coal layer paste filling body can also actively support the roof surrounding rock, and the original uncontrollable sinking is reduced or even overcome.
S3, removing the slack coal body on the side of the strip coal pillar 3 close to the strip goaf 4, namely the slack coal body removing part 7, and simultaneously retaining the slack coal body with a certain width, namely the slack coal body retaining part 81;
preferably, in step S3, the difference between the sum of the width of the banded goaf 4 and the width of the slack coal removal part 7 on both sides of the banded goaf and the width of the rest part of the banded coal pillar 3 is not less than the difference between the original width of the banded coal pillar 3 and the original width of the banded goaf 4, that is, the width of the upper coal layer paste filling body 9 is not less than the width 3 of the banded coal pillar.
Preferably, the width of the slack coal body can be obtained based on a progressive destruction theory or can be obtained through actual detection.
S4, connecting one end of a filling branch pipe (not shown in the figure) with the filling perforation 12, and abutting the loose coal body retaining part 81 on one side at the other end; filling the strip goaf 4 and the slack coal clearing parts 7 at two sides of the strip goaf from bottom to top by using paste filling materials to form an upper coal layer paste filling body 9;
preferably, in step S4, when the strip gob 4 is filled with the paste filling material, gangue such as underground excavation is continuously filled into the strip gob 4.
S5, after the upper coal layer paste filling body 9 is stabilized, tunneling the strip coal pillar mining roadway 8 along the loose coal body retaining part 81, paving lower coal layer filling main pipes (not shown in the figure) in the strip coal pillar mining roadway 8 on one side, and connecting the lower coal layer filling main pipes with filling branch pipes one by one, wherein the lower coal layer filling main pipes are provided with connecting valves one by one; the cut holes are communicated with the strip coal pillar stoping roadway 8 at two sides, and then the recovery work of the strip coal pillars is carried out; the strip coal pillar 3 can be recovered by adopting a short-wall mode;
preferably, the width of the slack coal body retention portion 81 is less than or equal to the width of the tunneled strip coal pillar extraction roadway 8.
Has the advantages that: for steps S3 and S5, after the upper coal seam is mined by using strips, the part of the remaining strip coal pillars that actually plays a role in supporting overlying strata is located in the middle of the width direction (inclination) of the strip coal pillars, and coal bodies on both sides deform and are damaged due to compression to form a slack zone/portion, so that the upper coal seam is not supported; if the strip goaf 4 is directly filled with paste, and if the width of the roadway is narrower than the width of the slack zone/slack part when a strip coal pillar stoping roadway 8 is subsequently tunneled, the side part of the tunneled roadway is still the slack zone/slack part and is difficult to support; in the invention, by removing part of the slack area/part and reserving the slack area/part with a certain width, the width of the slack area/part is smaller than or equal to the width of the strip coal pillar mining roadway 8, so that the width of the upper coal layer paste filling body 9 can be improved, the overlying strata control effect can be improved, and the strip coal pillar mining roadway 8 is beneficial to tunneling (tunneling in the slack area) and supporting and maintaining (no slack area exists after tunneling).
In addition, the width of the upper coal bed paste filling body 9 is not less than the width 3 of the strip coal pillar to ensure the mining proportion, so that the supporting effect of the upper coal bed paste filling body 9 on the roof surrounding rock after the strip coal pillar is recovered is ensured.
S6, lagging the recovery progress of the upper coal seam stripe coal pillar 3, tunneling a lower coal seam working face stoping roadway 10 in the lower coal seam, wherein two stoping roadways 10 on the same working face of the lower coal seam are respectively positioned below the middle parts of two adjacent stripe coal pillars 3 of the upper coal seam; namely the mining width of the working face of the lower coal seam is the sum of the widths of the upper coal seam stripe coal pillar and the stripe goaf;
has the advantages that: the reason why the stoping roadway of the lower coal seam is arranged below the middle part of the upper coal seam stripe coal pillar is that after the paste of the upper coal seam stripe goaf 4 is filled and the stripe coal pillar 3 is recovered, stress concentration can be formed at the position of the upper coal seam paste filling body 9 of the upper coal seam, the stripe coal pillar goaf 11 is formed after the stripe coal pillar 3 is recovered, stress release is formed, the tunneling work of the lower coal seam stoping roadway 10 is facilitated below the coal pillar goaf 11, and the maintenance work of the subsequent lower coal seam stoping roadway 10 is facilitated.
S7, adopting a longwall face-up mining mode from bottom to top on the lower coal seam working face 13, when the filling penetration holes 12 leak to the mined-out area of the lower coal seam working face 13, opening corresponding valves on corresponding filling branch pipes, and injecting paste filling materials into the mined-out area of the lower coal seam working face 13 to form a lower coal seam paste filling body 14;
preferably, when the mining empty area of the lower coal seam working face 13 is filled with the paste filling material, gangue such as underground tunneling gangue is continuously filled into the mining empty area.
Has the advantages that: for the steps S4 and S7, the upper coal seam has been partially mined (the strip goaf 4 is a part) by strip mining, so the workload of recovering the strip coal pillars 3 is less than the mining workload of the lower coal seam, and the paste filling system of the lower coal seam can be arranged together with the upper coal seam by arranging the filling penetration holes 12, thereby simplifying the work load of filling pipelines, simultaneously reducing the interference of paste filling on the mining workload of the lower coal seam, improving the mining efficiency of the lower coal seam and enabling the mining speeds of the upper coal seam and the lower coal seam to be matched as much as possible; furthermore, the upper coal seam and the lower coal seam adopt an upward-inclined mining mode simultaneously, the throwing speed of the gangue and the flowing speed of the paste material are greatly improved, and the paste material can be completely propped. Creatively proposes that the waste filling and the paste filling are mixed, so that the tunneling waste/underground waste is not loaded into the well, special crushing is not needed, and only the transportation requirement is met.
S8, performing tunneling work of one stoping roadway of the next working face of the lower coal seam by adopting a gob-side tunneling technology, and tunneling the other stoping roadway of the next working face by adopting a conventional mode;
has the advantages that: although the working face of the lower coal seam adopts a mining and filling mode, the filling is delayed for coal mining, and the paste filling also needs a certain setting time, so that a certain slack area/slack part can be generated at the lateral coal wall of the next working face, but the width of the slack area/slack part is limited due to the relatively timely filling, and the gob-side entry driving technology is adopted to facilitate the entry driving of a roadway (driving in the slack area) to support and maintain (no slack area exists after the entry driving); if the gob-side entry retaining technology is adopted, one side wall of the retained stoping roadway (corresponding to 9 in fig. 1) is a lateral coal wall of the next working face, and a certain slack area/portion exists, so that the retaining and the later maintenance are not facilitated.
And S9, circulating the steps until the coal seam is mined.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A method for stabilizing surrounding rock filled with downward paste of water body pressed coal comprises an upper coal seam which is mined in a dip stripe mining mode and a similar unexplored lower coal seam, and is characterized by comprising the following specific steps:
s1, for the upper coal seam, arranging a mining area preparation roadway at the inclined upper part of the mining area, and recovering strip coal pillars in a single-wing retreating mode;
for the lower coal seam, arranging a mining area preparation roadway at the inclined upper part of the mining area, and adopting single-wing retreat mining;
s2, erecting single hydraulic props at intervals along the inclination in the strip goaf, and jacking the single hydraulic props to support the roof surrounding rocks which are deflected; then, replacing a single hydraulic prop with a wood prop;
constructing filling cross-layer holes at intervals along the inclination in the strip goaf, and constructing the hole bottoms of the filling cross-layer holes to the top plate surrounding rock of the lower coal seam;
s3, removing the loose coal bodies on the side of the strip coal pillar close to the strip mining area, and simultaneously keeping the loose coal bodies with a certain width;
s4, connecting one end of a filling branch pipe with a filling penetration hole, and abutting the other end against the loose coal body reserved part on one side; filling the strip goaf and the loose coal clearing parts at two sides of the strip goaf from bottom to top by using paste filling materials;
s5, after the upper coal seam paste filling body is stabilized, tunneling a strip coal pillar stoping roadway along the remaining part of the loose coal body, laying a lower coal seam filling main pipe in the strip coal pillar stoping roadway on one side, connecting the lower coal seam filling main pipe with filling branch pipes one by one, and arranging connecting valves one by one; the cut holes are communicated with the strip coal pillar stoping roadways on the two sides, and then the strip coal pillars are recovered;
s6, lagging the recovery progress of the upper coal seam stripe coal pillar, digging a lower coal seam working face stoping roadway in the lower coal seam, wherein two stoping roadways of the same working face of the lower coal seam are respectively positioned below the middle parts of two adjacent stripe coal pillars of the upper coal seam;
s7, adopting longwall upward mining on the lower coal seam working face, opening corresponding valves on corresponding filling branch pipes when filling penetration holes leak to the goaf of the lower coal seam working face, and injecting paste filling materials into the goaf of the lower coal seam working face;
s8, performing tunneling work of one stoping roadway of the next working face of the lower coal seam by adopting a gob-side tunneling technology, and tunneling the other stoping roadway of the next working face by adopting a conventional mode;
and S9, circulating the steps until the coal seam is mined.
2. The paste-filled wall rock stabilizing method according to claim 1, wherein in step S2, the individual hydraulic props, the wood props, and the filling perforations are arranged in rows and at intervals along the inclination.
3. The method for stabilizing a paste-filled wall rock according to claim 1, wherein the width of the paste-filled upper coal layer is not less than the width of the coal string.
4. The paste-filled wall rock stabilizing method according to claim 1, wherein in step S4, when the strip goaf is filled with the paste filling material, the strip goaf is continuously filled with underground tunneling gangue.
5. The paste-filled wall rock stabilizing method according to claim 1, wherein in step S6, the mining width of the lower coal seam face is the sum of the widths of the upper coal seam stripe pillar and the stripe gob.
6. The paste-filled surrounding rock stabilization method according to claim 1, wherein the strip coal pillar can be recovered in a short-wall manner.
7. The paste-filled surrounding rock stabilizing method according to claim 1, wherein the width of the slack coal body remaining part is less than or equal to the width of the strip coal pillar extraction roadway.
8. The paste-filled surrounding rock stabilizing method according to claim 1, wherein when the paste filling material is used for filling the goaf of the working face of the lower coal seam, underground tunneling gangue is continuously filled into the goaf.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117386367A (en) * | 2023-10-23 | 2024-01-12 | 中国矿业大学 | Fully-mechanized mining method for multi-filling long walls of left strip coal pillar |
| CN117449853A (en) * | 2023-10-23 | 2024-01-26 | 中国矿业大学 | Strip goaf full-filling legacy coal pillar local double mining method |
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2021
- 2021-10-14 CN CN202111195434.8A patent/CN113847031A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117386367A (en) * | 2023-10-23 | 2024-01-12 | 中国矿业大学 | Fully-mechanized mining method for multi-filling long walls of left strip coal pillar |
| CN117449853A (en) * | 2023-10-23 | 2024-01-26 | 中国矿业大学 | Strip goaf full-filling legacy coal pillar local double mining method |
| CN117386367B (en) * | 2023-10-23 | 2024-05-31 | 中国矿业大学 | Fully-mechanized mining method for multi-filling long walls of left strip coal pillar |
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Application publication date: 20211228 |