CN114673551A - Old goaf CO2Mineralization grouting method - Google Patents
Old goaf CO2Mineralization grouting method Download PDFInfo
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- CN114673551A CN114673551A CN202210414721.1A CN202210414721A CN114673551A CN 114673551 A CN114673551 A CN 114673551A CN 202210414721 A CN202210414721 A CN 202210414721A CN 114673551 A CN114673551 A CN 114673551A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
Abstract
The invention discloses old goaf CO2A mineralization grouting method, which belongs to the technical field of goaf treatment; the method comprises the following steps: firstly, dividing a goaf grouting range into a caving zone and a fissure zone, determining the slurry diffusion radius of the caving zone and the fissure zone under an isobaric grouting condition through grouting in an experimental zone, using the slurry diffusion radius of the caving zone and the fissure zone as an index to design a drilling hole pitch for grouting and filling, and filling the caving zone and the fissure zone; and then, injecting a mineralized material and industrial waste gas into the goaf, wherein the injected mineralized material slurry can react with the industrial waste gas, and the goaf is supported while the industrial waste gas is fixed. The industrial waste gas is injected into the goaf to react with the slurry and then is sealed underground, so that the environmental pollution is effectively reduced, and the industrial waste gas reacts with the slurry and then is generatedThe formed product plays a role in supporting and protecting the goaf and has positive effects on environmental protection and management.
Description
Technical Field
The invention belongs to the technical field of goaf treatment, and particularly relates to old goaf CO2A mineralization grouting method.
Background
China-based huge annual industrial waste gas emission (CO in industrial waste gas)2The content is as high as more than 90 percent), and under the dual background that the recycling means of industrial waste gas is limited and China has a large number of old goafs requiring grouting treatment, the coal ash-based porous geopolymer which is suitable for grouting treatment of the old goafs of coal mines and takes the mineralization of industrial waste gas as a technical means, the coal ash and the like as reaction carriers and the old goafs as storage places is developed; under the condition of sealing the goaf, the injection of mineralized materials is completed, so that the mineralization treatment of the goaf is completed.
In recent years, the grouting filling technology of old goafs is rapidly developed, and various grouting methods are gradually proposed, which include: under a certain mining depth, the old goaf can adopt strip-shaped grouting filling, and the distance between grouting holes is 2 times of the diffusion radius of the grout; the grouting filling mode of the longwall gently inclined old goaf can be divided into 3 types of point column type grouting, strip type grouting and total grouting. However, the current grouting method has the following defects or shortcomings:
1. the grouting diffusion radiuses of the collapse zone and the fracture zone are considered to be equal, so that the design of the distance between grouting holes is deviated;
2. the minimum diffusion radius of a collapse zone and a fracture zone is taken as an index to design the hole pitch of the drilling hole, so that the hole pitch of the grouting drilling hole is too small, the number of the drilling holes is too large, and the drilling amount is too large;
3. the old goaf can be used as a reaction site of mineralized material slurry and industrial waste gas and is not fully utilized.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides an old goaf CO2A mineralization grouting method.
In order to solve the technical problem, the invention comprises the following steps:
dividing a goaf grouting range into a caving zone and a fissure zone, determining slurry diffusion radiuses of the caving zone and the fissure zone under an isobaric grouting condition through experimental zone grouting, using the slurry diffusion radiuses of the caving zone and the fissure zone to share the same drilling hole for grouting, designing a drilling hole pitch by taking the slurry diffusion radiuses of the caving zone as indexes to perform grouting filling work, and filling the caving zone and the fissure zone by utilizing the difference of the sizes of gaps of the caving zone and the fissure zone;
injecting a mineralized material and industrial waste gas into the goaf, wherein the injected mineralized material slurry can react with the industrial waste gas, and the goaf is supported while the industrial waste gas is fixed;
and (3) detecting the sealing condition of the goaf by using the tracer gas, and then grouting and plugging the area with poor sealing performance to complete the complete sealing of the goaf.
The invention provides old goaf CO2The mineralization grouting method comprises the following steps:
theoretical calculation is carried out according to the actual condition of the stratum of the working area, and the heights of a goaf caving zone and a fracture zone are determined by combining drilling observation;
determining the slurry diffusion radius of a collapse zone and a fracture zone under an isobaric grouting condition through grouting in an experimental area; calculating or measuring the treatment area range D of the horizontal plane along the long and short axis directions of the building on the spotx、Dy；
According to the range of the treatment area, curtain holes are arranged on the periphery of the treatment area, and grouting holes are arranged in the central area of the treatment area;
determining the hole opening aperture, the drilling depth and the final hole position of the curtain hole and the grouting hole, and determining the pressure of the hole opening;
after the drilling positions of all curtain holes and the grouting holes are determined, the grouting holes in the center positions of the center areas are selected as tracer gas release holes, the sealing condition of the goaf is detected by using tracer gas after drilling, grouting and leaking stoppage are performed on the areas with poor sealing, and a tracer experiment is performed again after leaking stoppage is completed to ensure that the inside of the goaf is completely sealed;
calculating the space volume V of the goaf according to the range of the goaf and the heights of the caving zone and the fissure zone1And then calculating the total amount of the slurry which can be injected as Q1Then determining the total injection quantity Q of the industrial waste gas according to the capability of the slurry to mineralize the industrial waste gas2；
Adding water into the mineralized material for pulping, and injecting the mineralized material into the goaf through the grouting holes after the pulping is finished; laying a pressure pipeline, and injecting the collected industrial waste gas into a central area of the treatment area through the pressure pipeline;
and grouting the periphery of the treatment area through the curtain holes to achieve the purpose of completely filling the periphery of the treatment area, after the curtain holes are completely grouted, grouting the central area of the treatment area, and respectively injecting slurry and industrial waste gas into the central area through the grouting holes.
Preferably, the method for determining the slurry diffusion radius of the collapse zone and the fissure zone comprises the following steps:
taking the grouting holes as the circle centers, wherein a plurality of groups of observation holes are arranged on the peripheries of the grouting holes, and each group of observation holes are arranged on the same outer diameter of the grouting hole;
firstly, observing the slurry diffusion conditions of a collapse zone and a fracture zone in an area with the outer diameter of 40m of a drill hole, then observing the slurry diffusion conditions of the collapse zone and the fracture zone in an area with the outer diameter of 20m, and determining the slurry diffusion boundary positions of the collapse zone and the fracture zone;
then, observing the drill hole with the outer diameter of 10m or 30m, and by analogy, observing the slurry diffusion boundary of the caving zone and the fissure zone, and acquiring the slurry diffusion radiuses of the caving zone and the fissure zone as R and R respectively1。
Preferably, in order to completely fill the collapse zone, an inscribed square of a circle having an inner diameter equal to the slurry diffusion radius is taken, and the slurry diffusion radius after correction is obtained as
The collapse zone is completely filled at the moment;
grouting and filling the fractured zone, filling the reference zone and grouting diffusion radius R of the fractured zone1I.e. the width of the strip filling, the corrected slurry diffusion radius is
The difference in the radius of diffusion of the slurry in the fractured zone is the unfilled width of the zone.
Preferably, the range of the treatment area of the horizontal plane along the long and short axes of the building is calculated or measured in the field as Dx、DyThe number of drilled holes is
Preferably, each group of observation holes is provided with three observation holes, and the observation holes on the same outer diameter are distributed in an equilateral triangle shape.
Preferably, the curtain holes and the grouting holes are arranged in the following mode: and arranging curtain holes by taking the slurry diffusion radius smaller than the corrected collapse zone as a drilling distance, and arranging grouting holes by taking the slurry diffusion radius which can be completely filled in the corrected collapse zone as the drilling distance.
Preferably, SF is used6As a tracer gas, releasing the tracer gas into the goaf through the selected release holes;
SF6sealing the top of the release hole after release, and then monitoring SF in the range of the goaf in real time by utilizing monitoring equipment6And taking each curtain hole and grouting hole as monitoring points according to each monitoring point SF6The concentration of (d) can infer the location of the leak;
and after the leakage is confirmed according to the monitoring result, grouting and plugging are immediately carried out on the leakage point.
Preferably, the injection amount of the slurry and the industrial waste gas is as follows:
because the space volume of the goaf occupies the coal mining volume V of the whole goaf230% of (i), i.e. V1＝0.3V2In order to ensure that the goaf is completely sealed after grouting, the total volume Q of the slurry1Proportional ratio gob volume V1Slightly larger, i.e. get Q1＝1.1V1；
The ratio of the slurry mineralized industrial waste gas obtained after the mineralization experiment is carried out under the laboratory condition is R, and the total injection quantity Q of the industrial waste gas2＝Q1×R。
The invention also provides application of the mineralization grouting method in mining old goaf by longwall full-span method, and the application of the method in mining old goaf CO2A mineralization grouting method.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides old goaf CO2The mineralization grouting method is particularly suitable for mining old goafs by a longwall full-span method, has the advantages of small drilling engineering quantity, relatively low grouting filling cost and simple operation, can complete mineralization treatment of the old goafs, and can seal industrial waste gas to be fully utilized.
The drilling hole spacing is more reasonable, complete filling of a collapse zone and strip filling of a fracture zone can be guaranteed, the number of drilling holes is reduced, and the early investment and preparation time are shorter than those of the traditional method; the invention can reduce the use amount of grouting raw materials, thereby reducing the grouting filling cost and ensuring the grouting effect.
Because the caving zone has a plurality of residual gaps and is partially filled, the overlying rock stratum tends to sink unevenly along with the lapse of time, and the upper building is influenced; the crack zone has few gaps, and is gradually closed in the mining process, the residual gaps are few and few, only slight subsidence can be generated without filling, and the upper building cannot be influenced; therefore, the hidden danger of damaging the upper building can not be caused only by filling all the caving zones. The invention completes the mineralization treatment of the old goaf and simultaneously completes the sealing of the industrial waste gas, the industrial waste gas is injected into the goaf to react with the slurry to be sealed and underground after being collected and pressurized, the environmental pollution is effectively reduced, and the product generated after the reaction with the slurry plays a role in supporting and protecting the goaf, thereby having positive effects on environmental protection and treatment.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic structural view of a grouting system according to the present invention;
FIG. 2 is a schematic illustration of a test zone drilling arrangement according to the present invention;
FIG. 3 is a schematic view of the arrangement of the curtain holes and grouting holes of the present invention;
FIG. 4 is a schematic view of a drilling arrangement according to the present invention;
FIG. 5 is a concentration distribution diagram of the tracer experiment according to the present invention.
The symbols in the figures denote:
1. a collapse zone; 2. a fissure zone; 3. a coal seam; 4. bedrock; 5. a top soil layer; 6. a water storage tank; 7. a primary mixing drum; 8. a second-stage mixing drum; 9. screening machine; 10. a pulp storage tank; 11. a grout stopping plug; 12. a central grouting pipe; 13. a base plate; 14. grouting holes; 15. an observation hole; 16. a curtain hole; 17. grouting a fractured zone; 18. grouting the caving zone.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Referring to FIG. 1, the present invention provides an old goaf CO2The mineralization grouting method comprises the following steps:
dividing the grouting range of the goaf into a caving zone 1 and a fracture zone 2, determining the slurry diffusion radii of the caving zone 1 and the fracture zone 2 under an isobaric grouting condition through grouting of an experimental zone, enabling the caving zone 1 and the fracture zone 2 to share the same drilling hole for grouting, designing the drilling hole distance by taking the slurry diffusion radius of the caving zone 1 as an index for grouting and filling, and achieving the purposes of completely filling the caving zone 1 and filling the fracture zone 2 by utilizing the natural difference of the sizes of gaps of the caving zone 1 and the fracture zone 2.
In FIG. 1, 1 is a caving zone; 2 is a fissure zone; 3 is a coal bed; 4 is bedrock; and 5 is a topsoil layer.
The mineralized material and the industrial waste gas are injected into the goaf, the injected mineralized material slurry can react with the industrial waste gas, and the goaf can be supported while the industrial waste gas is fixed;
in order to prevent industrial waste gas injected into the old goaf at the later stage from leaking, the sealing condition of the old goaf is detected in advance by using tracer gas, and then grouting and plugging are performed on the area with poor sealing property in a targeted manner according to specific conditions to complete the complete sealing of the goaf.
In particular to the CO in the old goaf2The mineralization grouting method comprises the following steps:
firstly, according to the actual situation of the stratum of a working area, theoretical calculation is carried out according to the rules of building, water body, railway and roadway coal pillar reservation and coal pressing mining, and the height H of the caving zone 1 of the goaf is determined by combining drilling observation1And height H of fractured zone 22。
Determining the slurry diffusion radius of a collapse zone and a fracture zone under the isobaric grouting condition through grouting in an experimental area;
of diffusion radius of slurry in zone 1 and crack 2The determination method comprises the following steps: with the grouting holes 14 as the circle centers, a plurality of groups of observation holes 15 are arranged on the peripheries of the grouting holes 14, and each group of observation holes 15 is arranged on the circumference of the same outer diameter positioned on the outer side of the grouting hole 14; as shown in figure 2, firstly, observing the grout diffusion condition of a collapse zone and a fracture zone in an area with the outer diameter of 40m of a drill hole, then observing the grout diffusion condition of the collapse zone and the fracture zone in an area with the outer diameter of 20m, determining the grout diffusion boundary positions of the collapse zone and the fracture zone, then observing the drill hole with the outer diameter of 10m or 30m of the drill hole, and so on, observing the grout diffusion boundaries of the collapse zone and the fracture zone, and obtaining the grout diffusion radiuses of the collapse zone and the fracture zone which are respectively R and R1。
Furthermore, as a preferred embodiment of the present invention, each group of observation holes is provided with three observation holes 15, and the three observation holes 15 arranged on the same outer diameter are arranged in an equilateral triangle.
When the slurry diffusion radii of the collapse zone 1 and the fracture zone 2 are obtained, data correction needs to be carried out on the slurry diffusion radii.
Specifically, in order to completely fill the collapse zone, an inscribed square of a circle having an inner diameter of the slurry diffusion radius is taken, and the slurry diffusion radius after correction can be obtained as
The collapse zone is completely filled at the moment; grouting and filling the fractured zone, filling the reference zone and grouting diffusion radius R of the fractured zone1I.e. the width of the strip filling, the corrected slurry diffusion radius is
The difference in the radius of diffusion of the slurry in the fractured zone is the unfilled width of the zone.
For fractured zones, the ratio of strip filling is as follows due to the small number of residual voids
When in use
When the temperature of the water is higher than the set temperature,
when the temperature of the water is higher than the set temperature,
under normal circumstances
Is not greater than
So that no harmful influence is caused on the earth surface.
Furthermore, the range of the treatment area of the horizontal plane along the long and short axes of the building is calculated or measured on the spot as Dx、DyThe number of drilled holes is
Analysis shows that when the drilling distance is enlarged, the number of drilled holes is reduced, and therefore the drilling footage is reduced.
Thirdly, according to the range of the treatment area, curtain holes are arranged on the periphery of the treatment area, and grouting holes are arranged in the central area of the treatment area; as shown in fig. 3, curtain holes 16 are arranged with a drilling interval smaller than the grout diffusion radius of the corrected caving zone, and grouting holes 14 are arranged with a drilling interval equal to the grout diffusion radius at which the corrected caving zone can be completely filled; in the figure, 17 is the fissure zone grouting, and 18 is the caving zone grouting.
Further, the curtain holes 16 are drilled at intervals
The holes are arranged around the goaf, and the drilling distance is smaller than the corrected dispersion radius of the slurry in the caving zone, so that the slurry after grouting can completely permeate the periphery of the goaf after being dispersed to the periphery through each curtain hole, and the effect of completely sealing the periphery of the goaf can be achieved.
Drilling interval of grouting holes
And after grouting, completely filling the central area collapse zone, and filling the fissure zone.
Fourthly, determining the hole opening aperture, the hole drilling depth and the final hole position of the curtain hole 16 and the grouting hole 14, and determining the pressure of the hole opening through a water-pressing experiment;
specifically, as shown in fig. 4, 1 is a collapse zone, 2 is a fracture zone, 3 is a coal seam, 4 is a bedrock, 5 is a surface soil layer, and 13 is a bottom plate.
A prefabricated concrete well plate is arranged on the wall of the curtain hole, and the wall is sealed by cement; the hole diameter of a drilling hole of the curtain hole and the grouting hole is not less than phi 130mm, the drilling hole penetrates through a unconsolidated layer and is drilled to a complete bedrock section for 5m, then a casing pipe is put, cement mortar is used for fixing a pipe and protecting the wall, a water pressing test is carried out after the orifice pipe is solidified, an in-situ test of the development condition and the water permeability of a rock mass fracture is known, the maximum pressure is not lower than 3Mpa, and the condition that slurry is not mixed is ensured; and then drilling a drill hole with the aperture not smaller than phi 89mm downwards, and tunneling to the position 2m below the bottom plate of the coal seam to be filled as a final hole.
Further, as a preferred embodiment of the present invention, all drilled holes have a deviation of less than 1m and a hole inclination of less than 1 °.
Fifthly, after the drilling positions of all the curtain holes and the grouting holes are determined, selecting the grouting holes in the center position of the center area as tracer gas release holes, firstly drilling holes in the hole positions according to the requirements, and then drilling the rest curtain holes and the grouting holes after tracer tests.
In particular, SF is used6As tracer gas, SF6As a trace gas widely applied, the trace gas has stable chemical properties, is colorless and tasteless gas at normal temperature and normal pressure, does not react with acid, alkali and salt, and has excellent performance; through selected release holes into the gob, SF6Sealing the top of the release hole after release, and then monitoring SF in the range of the goaf in real time by using a monitoring instrument6And using each curtain hole and grouting hole as monitoring points according to each monitoring point SF6The concentration of (d) can infer the location of the leak; because of the SF collected at each monitoring point6The concentration is different, and SF is deduced according to the diffusion motion law6The monitoring point with higher concentration isIs the leakage point.
Then, after the leakage is confirmed according to the monitoring result, grouting and plugging are immediately carried out on the leakage point; firstly, determining the leakage range according to the SF of each monitoring point6And (5) concentration, drawing a concentration distribution diagram, and selecting a grouting position. As shown in fig. 5, the concentration distribution diagram is divided into three regions, i.e., a high region, a middle region and a low region from inside to outside in sequence, and the leakage position should be in the high concentration region; and taking the central position of the high-concentration area as a grouting point, drilling downwards and then grouting, wherein the drilling method and the grouting method are the same as the above. And (4) performing a tracing experiment again after the plugging is finished, and if the leakage part is detected to be still remained, repeating the steps to perform the plugging until the inner part of the goaf is completely sealed.
Sixthly, calculating the space volume V of the goaf according to the range of the goaf and the heights of the caving zone and the fissure zone1And then calculating the total amount of the slurry which can be injected as Q1Then determining the total injection quantity Q of the industrial waste gas according to the capability of the slurry to mineralize the industrial waste gas2。
Specifically, according to the actual management experience of the goaf, the space volume of the goaf occupies about the coal mining volume V of the whole goaf230% of (i), i.e. V1＝0.3V2In order to ensure that the goaf is completely sealed after grouting, the total volume Q of the slurry1Proportional goaf volume V1Slightly larger, i.e. get Q1＝1.1V1；
The ratio of the slurry mineralized industrial waste gas obtained after the mineralization experiment is carried out under the laboratory condition is R, and the total injection quantity Q of the industrial waste gas2＝Q1×R。
Further, for the calculation of R, for example, when 1L of slurry can mineralize 0.15L of supplemented pressurized industrial waste gas, R is 0.15.
Adding water into the mineralized material for pulping, and injecting the mineralized material into the goaf through a grouting hole by using a grouting pump after the pulping is finished; then, industrial waste gas generated in industrial places such as a power plant and the like is collected and pressurized and then is conveyed into a tank truck, and is transported to a treatment area through a tank truck for filling; laying a pressure pipeline, connecting the pressure pipeline to a tank truck delivery valve through the pressure pipeline, laying the pipeline to the central area of a treatment area, and carrying out pipeline connection delivery according to the position requirement of each grouting hole.
Specifically, as shown in fig. 1, the grouting process is as follows: firstly, mineralized materials (fly ash or other materials) are fed into a first-stage mixing drum 7 to be mixed with water for the first time, a water storage tank 6 is used for storing water, the water flows out and is removed slag through a cylinder hoop with 3mm mesh phi of a screening machine 9 or a plane vibration screen, slurry with the diameter less than 3mm flows into a second-stage mixing drum 8 after screening, and then cement (with the strength grade of 32.5) is added for the second time; after being stirred, the mixture flows into a slurry storage tank 10, and then is conveyed into a drill hole through a central slurry injection pipe 12 with the diameter of 50mm by a slurry injection pump, a slurry stop plug 11 is arranged on the slurry injection pipe and is pressed into coal rock blocks in a goaf from a perforated pipe at the lower part of the slurry injection pipe, and the slurry injection operation is carried out.
And eighthly, grouting the treatment area through the curtain holes to achieve the purpose of completely filling the periphery in the range of the treatment area, grouting the central area of the treatment area after all the curtain holes are completely grouted, respectively injecting slurry and industrial waste gas into the central area through the grouting holes, and sealing the injected industrial waste gas without leakage.
Further, as a preferred embodiment of the invention, during grouting, when the curtain hole opening pressure reaches 2.5-3.0MPa and the pump amount is less than 30L/min, the pressure is maintained for 30min, and grouting is finished.
Specifically, the grouting process of the whole central area can be divided into n stages, each stage comprises two steps of injecting industrial waste gas and injecting slurry, and the steps are performed in the sequence of injecting the industrial waste gas first and injecting the slurry later; the injection amount of industrial waste gas and slurry in each stage is as follows: and (4) total injection amount/n, wherein the standard of grouting ending is final amount final pressure, namely when grouting is carried out on the goaf, when the pressure of the orifice of a grouting hole reaches 2.5MPa and the pump capacity is less than 30L/min, the pressure is maintained for 30 min.
The invention provides old goaf CO2The mineralization grouting method is particularly suitable for mining old goafs by a longwall full-span method, has the advantages of small drilling engineering quantity, relatively low grouting filling cost and simple operation, can complete mineralization treatment of the old goafs, and can seal industrial waste gas to be fully utilized.
The drilling hole spacing is more reasonable, complete filling of a collapse zone and strip filling of a fracture zone can be guaranteed, the number of drilling holes is reduced, and the early investment and preparation time are shorter than those of the traditional method; the invention can reduce the use amount of grouting raw materials, thereby reducing the grouting filling cost and ensuring the grouting effect.
Because the caving zone has a plurality of residual gaps and is partially filled, the overlying rock stratum tends to sink unevenly along with the lapse of time, and the upper building is influenced; the crack zone has few gaps, and is gradually closed in the mining process, the residual gaps are few and few, only slight subsidence can be generated without filling, and the upper building cannot be influenced; therefore, the hidden danger of damaging the upper building can not be caused only by filling all the caving zones. The invention completes the mineralization treatment of the old goaf and simultaneously completes the sealing of the industrial waste gas, the industrial waste gas is injected into the goaf to react with the slurry to be sealed and underground after being collected and pressurized, the environmental pollution is effectively reduced, and the product generated after the reaction with the slurry plays a role in supporting and protecting the goaf, thereby having positive effects on environmental protection and treatment.
In the description of the present invention, it is to be understood that the orientations or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like are based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and for simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present application. Further, in the description of the present application, "a plurality" means two or more unless specifically defined otherwise.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A kind ofOld goaf CO2The mineralization grouting method is characterized by comprising the following steps:
dividing a goaf grouting range into a caving zone and a fissure zone, determining slurry diffusion radiuses of the caving zone and the fissure zone under an isobaric grouting condition through experimental zone grouting, using the slurry diffusion radiuses of the caving zone and the fissure zone to share the same drilling hole for grouting, designing a drilling hole pitch by taking the slurry diffusion radiuses of the caving zone as indexes to perform grouting filling work, and filling the caving zone and the fissure zone by utilizing the difference of the sizes of gaps of the caving zone and the fissure zone;
injecting a mineralized material and industrial waste gas into the goaf, wherein the injected mineralized material slurry can react with the industrial waste gas, and the goaf is supported while the industrial waste gas is fixed;
and (3) detecting the sealing condition of the goaf by using the tracer gas, and then grouting and plugging the area with poor sealing performance to complete the complete sealing of the goaf.
2. Old goaf CO2The mineralization grouting method is characterized by comprising the following steps:
theoretical calculation is carried out according to the actual condition of the stratum of the working area, and the heights of a goaf caving zone and a fracture zone are determined by combining drilling observation;
determining the slurry diffusion radius of a collapse zone and a fracture zone under an isobaric grouting condition through grouting in an experimental area; calculating or measuring the treatment area range D of the horizontal plane along the long and short axis directions of the building on the spotx、Dy；
According to the range of the treatment area, curtain holes are arranged on the periphery of the treatment area, and grouting holes are arranged in the central area of the treatment area;
determining the hole opening aperture, the drilling depth and the final hole position of the curtain hole and the grouting hole, and determining the pressure of the hole opening;
after the drilling positions of all curtain holes and the grouting holes are determined, the grouting holes in the center positions of the center areas are selected as tracer gas release holes, the sealing condition of the goaf is detected by using tracer gas after drilling, grouting and leaking stoppage are performed on the areas with poor sealing, and a tracer experiment is performed again after leaking stoppage is completed to ensure that the inside of the goaf is completely sealed;
calculating the space volume V of the goaf according to the range of the goaf and the heights of the caving zone and the fissure zone1And then calculating the total amount of the slurry which can be injected as Q1Then determining the total injection quantity Q of the industrial waste gas according to the capability of the slurry to mineralize the industrial waste gas2；
Adding water into the mineralized material for pulping, and injecting the mineralized material into a goaf through a grouting hole after pulping is finished; laying a pressure pipeline, and injecting the collected industrial waste gas into a central area of the treatment area through the pressure pipeline;
and grouting the periphery of the treatment area through the curtain holes to achieve the purpose of completely filling the periphery of the treatment area, after the curtain holes are completely grouted, grouting the central area of the treatment area, and respectively injecting slurry and industrial waste gas into the central area through the grouting holes.
3. The old goaf CO of claim 12The mineralization grouting method is characterized in that the method for determining the slurry diffusion radius of a collapse zone and a fissure zone comprises the following steps:
taking the grouting holes as the circle centers, wherein a plurality of groups of observation holes are arranged on the peripheries of the grouting holes, and each group of observation holes are arranged on the same outer diameter of the grouting hole;
firstly, observing the slurry diffusion conditions of a collapse zone and a fracture zone in an area with the outer diameter of 40m of a drill hole, then observing the slurry diffusion conditions of the collapse zone and the fracture zone in an area with the outer diameter of 20m, and determining the slurry diffusion boundary positions of the collapse zone and the fracture zone;
then, observing the drill hole with the outer diameter of 10m or 30m, and by analogy, observing the slurry diffusion boundary of the caving zone and the fissure zone, and acquiring the slurry diffusion radiuses of the caving zone and the fissure zone as R and R respectively1。
4. Old goaf CO according to claim 32The mineralized grouting method is characterized in that in order to completely fill a collapse zone, an inscribed square of a circle with the slurry diffusion radius as the inner diameter is taken, and the slurry diffusion radius after correction is obtained to be
The collapse zone is completely filled at the moment;
grouting and filling the fractured zone, filling the reference zone and grouting diffusion radius R of the fractured zone1I.e. the width of the strip filling, the corrected slurry diffusion radius is
The difference in the radius of diffusion of the slurry in the fractured zone is the unfilled width of the zone.
5. Old goaf CO according to claim 42The mineralization grouting method is characterized in that the range of a treatment area of a horizontal plane along the long and short axis directions of a building is calculated or measured on the spot and is Dx、DyThe number of drilled holes is
6. Old goaf CO according to claim 32The mineralization grouting method is characterized in that each group of observation holes is provided with three observation holes, and the observation holes on the same outer diameter are distributed in an equilateral triangle shape.
7. The old goaf CO of claim 22The mineralization grouting method is characterized in that the curtain holes and the grouting holes are arranged in the following mode: and arranging curtain holes by taking the grout diffusion radius of the corrected collapse zone as the drilling distance, and arranging grouting holes by taking the grout diffusion radius which can be completely filled in the corrected collapse zone as the drilling distance.
8. The old goaf CO of claim 22The mineralizing and grouting method is characterized in that SF is adopted6Releasing the tracer gas into the gob through the selected release holes;
SF6sealing the top of the release hole after release, and then using a monitorSF (sulfur hexafluoride) within range of goaf is monitored by equipment in real time6And using each curtain hole and grouting hole as monitoring points according to each monitoring point SF6The concentration of (c) infers the location of the leak;
and after the leakage is confirmed according to the monitoring result, grouting and plugging are immediately carried out on the leakage point.
9. The old goaf CO of claim 22The mineralization grouting method is characterized in that the injection amount of slurry and industrial waste gas is as follows:
because the space volume of the goaf occupies the coal mining volume V of the whole goaf230% of (i), i.e. V1＝0.3V2In order to ensure that the goaf is completely sealed after grouting, the total volume Q of the slurry1Proportional goaf volume V1Large;
the ratio of the slurry mineralized industrial waste gas is R, and the total injection quantity Q of the industrial waste gas is obtained after the mineralization experiment is carried out under the laboratory condition2＝Q1×R。
10. Use of mineralization grouting method in longwall full-span old goaf mining, characterized in that it uses old goaf CO according to any of claims 1-92A mineralization grouting method.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115095387A (en) * | 2022-07-25 | 2022-09-23 | 中南大学 | Utilize filling material to seal up and deposit return airway CO in pit 2 Method (2) |
| CN115306479A (en) * | 2022-08-23 | 2022-11-08 | 中国矿业大学 | CO based on abandoned mine goaf 2 Block sealing method |
| CN117090550A (en) * | 2023-10-17 | 2023-11-21 | 太原理工大学 | Device and method for in-situ composite mining of residual coal based on superheated steam and supercritical water |
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2022
- 2022-04-20 CN CN202210414721.1A patent/CN114673551A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115095387A (en) * | 2022-07-25 | 2022-09-23 | 中南大学 | Utilize filling material to seal up and deposit return airway CO in pit 2 Method (2) |
| CN115306479A (en) * | 2022-08-23 | 2022-11-08 | 中国矿业大学 | CO based on abandoned mine goaf 2 Block sealing method |
| CN115306479B (en) * | 2022-08-23 | 2023-06-09 | 中国矿业大学 | CO based on abandoned mine goaf 2 Block type sealing method |
| WO2024041668A1 (en) * | 2022-08-23 | 2024-02-29 | 平安煤炭开采工程技术研究院有限责任公司 | Abandoned mine goaf-based method for storing co2 in partitioned sections |
| CN117090550A (en) * | 2023-10-17 | 2023-11-21 | 太原理工大学 | Device and method for in-situ composite mining of residual coal based on superheated steam and supercritical water |
| CN117090550B (en) * | 2023-10-17 | 2024-02-02 | 太原理工大学 | Device and method for in-situ composite mining of residual coal based on superheated steam and supercritical water |
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