CN116792099B - Construction method and system for stoping fault waterproof coal pillar under upper and lower aquifer conditions - Google Patents
Construction method and system for stoping fault waterproof coal pillar under upper and lower aquifer conditions Download PDFInfo
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- CN116792099B CN116792099B CN202310868676.1A CN202310868676A CN116792099B CN 116792099 B CN116792099 B CN 116792099B CN 202310868676 A CN202310868676 A CN 202310868676A CN 116792099 B CN116792099 B CN 116792099B
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- 239000003245 coal Substances 0.000 title claims abstract description 65
- 238000010276 construction Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 108
- 238000005553 drilling Methods 0.000 claims abstract description 63
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000005065 mining Methods 0.000 claims abstract description 16
- 230000004044 response Effects 0.000 claims abstract description 11
- 238000005520 cutting process Methods 0.000 claims abstract description 8
- 230000002159 abnormal effect Effects 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 3
- 239000013589 supplement Substances 0.000 abstract description 4
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000001502 supplementing effect Effects 0.000 description 6
- 238000007569 slipcasting Methods 0.000 description 4
- 230000009172 bursting Effects 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
Abstract
The application provides a construction method and a system for stoping a fault waterproof coal pillar under the condition of an upper aquifer and a lower aquifer. The method comprises the following steps: determining a projection area of a mining area of the fault waterproof coal pillar on the ground, and drilling holes downwards from the ground in the projection area of the fault waterproof coal pillar; grouting the fault zone through drilling holes, and cutting off hydraulic connection between the top plate aquifer and the bottom plate aquifer; grouting is carried out after the water is drained from the top plate aquifer, and the top plate aquifer is transformed into a weak aquifer or a water-resisting layer; grouting is carried out above the bottom plate aquifer, and the thickness of the bottom plate aquifer is increased; and in response to abnormal water gushing of the top water-bearing layer and the bottom water-bearing layer, performing supplementary grouting through drilling. Therefore, when the hydraulic connection is enhanced by the influence of faults on the top water-bearing layer and the bottom water-bearing layer, the safe and efficient stoping of the fault waterproof coal pillar is realized through the construction methods of 'one section', 'two drops', 'three plugs', 'four supplements'.
Description
Technical Field
The application relates to the technical field of coal mine safety exploitation, in particular to a construction method and a construction system for stoping a fault waterproof coal pillar under the condition of an upper aquifer and a lower aquifer.
Background
When coal resources in a part of areas are mined, two major types of aquifers are faced, namely a top plate fourth system aquifer is frequently encountered when the mining depth is relatively shallow; secondly, the limestone aquifer of the bottom plate is frequently encountered when the mining depth is relatively deep.
Because the two types of aquifers are far away from each other, the normal working surface rarely faces the threat of the two types of aquifers at the same time, but when encountering a large fault geological structure, the two types of aquifers can affect the safe exploitation of the working surface at the same time, particularly the fault can also play a role in strengthening the hydraulic connection of the top plate aquifers and the bottom plate aquifers, and the stoping of the working surface, particularly the stoping threat of shortening the fault waterproof coal pillar under the working condition is huge.
When the water-bearing layers of the top plate and the bottom plate are affected by faults to strengthen hydraulic connection, how to ensure safe and efficient recovery is a problem to be solved urgently.
Disclosure of Invention
The application aims to provide a construction method and a system for stoping a fault waterproof coal pillar under the condition of an upper aquifer and a lower aquifer, so as to solve or alleviate the problems in the prior art.
In order to achieve the above object, the present application provides the following technical solutions:
The application provides a construction method for stoping a fault waterproof coal pillar under the condition of an upper aquifer and a lower aquifer, which comprises the following steps: s101, determining a projection area of a mining area of the fault waterproof coal pillar on the ground, and drilling holes downwards from the ground in the projection area of the fault waterproof coal pillar; step S102, grouting a fault zone through drilling, and cutting off hydraulic connection between a roof aquifer and a floor aquifer; step S103, grouting is carried out after the water in the top plate aquifer is drained, and the top plate aquifer is transformed into a weak aquifer or a water-proof layer; step S104, grouting is carried out above the bottom plate water-bearing layer, and the thickness of the bottom plate water-bearing layer is increased; and step 105, performing supplementary grouting through drilling in response to the abnormal water gushing of the top water-bearing layer and the bottom water-bearing layer.
Preferably, in step S101, a main drilling hole is drilled downwards from the ground in the projection area of the fault waterproof coal pillar, and when the main drilling hole is drilled to a first preset distance above the roof aquifer, three secondary drilling holes are drilled at the bottom of the main drilling hole, one secondary drilling hole is drilled to the roof aquifer, one secondary drilling hole is drilled to the fault zone, and the other secondary drilling hole is drilled to a second preset distance above the bottom aquifer.
Preferably, in step S102, grouting is performed on the fault zone through a secondary drill hole applied to the fault zone, and drilling and coring are performed on the fault zone after grouting, and hydraulic connection between the roof aquifer and the floor aquifer is determined to be cut off according to the core strength and the core integrity of the fault zone.
Preferably, in step S102, grouting the fault zone includes: based on the working face geological model of the fault waterproof coal pillar, carrying out a fault waterproof coal pillar extraction numerical test, and determining the maximum bottom plate damage depth and the maximum top plate damage depth; dividing the fault zone into a filling zone, a reinforcing zone and a plugging zone from the bottom plate aquifer upwards in sequence according to the maximum top plate damage depth and the maximum top plate damage depth; grouting the filling section of the fault zone, and cutting off water gushing from the bottom plate water-bearing layer to the fault zone; grouting the reinforced section of the fault zone to block water burst from the top plate aquifer or the bottom plate aquifer to the working surface of the fault waterproof coal pillar through the fault zone; grouting is carried out on the plugging section of the fault zone, and water gushing from the roof aquifer to the fault zone is blocked.
Preferably, in step S103, the roof aquifer is drained, in response to the water pressure of the roof aquifer decreasing to a preset water pressure threshold, and the water content decreases to a first preset water content, the roof aquifer is grouting, until the water pressure of the roof aquifer decreases to a second preset water content, and then the roof aquifer is drilled and cored, so that the core strength of the roof aquifer is determined to reach the first preset strength.
Preferably, in step S104, after grouting is performed above the bottom plate aquifer, the bottom plate aquifer is drilled and cored, and in response to the core strength of the bottom plate aquifer being 1.5 times or more of the original strength, it is determined that the unit water inflow amount of the bottom plate aquifer is 0.1L/(s·m) or less, and the plugging of the bottom plate aquifer is completed.
Preferably, in step S105, hydrologic holes are respectively applied to the top-plate aquifer and the bottom-plate aquifer for water burst monitoring, and in response to the unit water burst amount in the process of recovering the fault waterproof coal pillar being greater than or equal to 0.1L/(s·m), the top-plate aquifer and/or the bottom-plate aquifer are respectively subjected to supplementary grouting.
The embodiment of the application also provides a construction system for stoping the fault waterproof coal pillar under the condition of the upper and lower aquifers, and a drilling unit is configured to determine a projection area of a mining area of the fault waterproof coal pillar on the ground and drill a hole downwards from the ground in the projection area of the fault waterproof coal pillar; the hydraulic cutoff unit is configured to perform grouting on the fault zone through drilling and cut off hydraulic connection between the top plate aquifer and the bottom plate aquifer; the hydraulic depressurization unit is configured to perform grouting after the roof aquifer is drained, and reform the roof aquifer into a weak aquifer or a water-resisting layer; the hydraulic plugging unit is configured to perform grouting above the bottom plate water-containing layer, and the thickness of the bottom plate water-containing layer is increased; and the grouting supplementing unit is configured to conduct supplementing grouting through drilling holes in response to abnormal water gushing of the top plate aquifer and the bottom plate aquifer.
The beneficial effects are that:
In the construction method for stoping the fault waterproof coal pillar under the condition of the upper and lower aquifers, firstly, determining a projection area of a mining area of the fault waterproof coal pillar on the ground, and drilling holes downwards from the ground in the projection area of the fault waterproof coal pillar; then grouting the fault zone through drilling holes, and cutting off hydraulic connection between the top plate aquifer and the bottom plate aquifer; then, grouting is carried out after the water is drained to the top plate aquifer, and the top plate aquifer is transformed into a weak aquifer or a water-resisting layer; grouting is carried out above the bottom plate aquifer, and the thickness of the bottom plate aquifer is increased; and finally, when the water burst abnormality of the top aquifer and the bottom aquifer is monitored, carrying out supplementary grouting through drilling.
By means of fault zone grouting, hydraulic connection between the roof aquifer and the bottom plate aquifer is cut off, then grouting reconstruction of the roof aquifer is performed, two-drop of water without sudden gushing is achieved during roof stoping, and grouting reconstruction of the bottom plate aquifer is performed, and three-blocking of water without sudden gushing is achieved during bottom plate stoping; and the four-supplement during the stoping of the working face is realized by supplementing grouting in time; so that the stoping can be safely and efficiently carried out when the water-bearing layer of the top plate and the water-bearing layer of the bottom plate are affected by faults to strengthen the hydraulic connection.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Wherein:
fig. 1 is a schematic flow chart of a construction method for stoping a fault waterproof coal pillar under the condition of an upper aquifer and a lower aquifer according to some embodiments of the present application;
FIG. 2 is a process diagram of a method of constructing a stope fault waterproof coal pillar under the conditions of a seed-up and a seed-down aquifer according to some embodiments of the present application;
Fig. 3 is a schematic structural diagram of a construction system for stoping a fault waterproof coal pillar under the condition of an upper aquifer and a lower aquifer according to some embodiments of the present application.
Detailed Description
The application will be described in detail below with reference to the drawings in connection with embodiments. The examples are provided by way of explanation of the application and not limitation of the application. Indeed, it will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the application. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield still a further embodiment. Accordingly, it is intended that the present application encompass such modifications and variations as fall within the scope of the appended claims and their equivalents.
The applicant researches find that when the hydraulic connection is enhanced by the fault influence of the top plate aquifer and the bottom plate aquifer in the current grouting reinforcement method for shortening the fault waterproof coal pillar stoping, in the stoping process, the top plate aquifer and the bottom plate aquifer are damaged under the influence of mining, so that the top plate aquifer and the bottom plate aquifer form a gushing water channel through a rock stratum crack, the top plate aquifer and the bottom plate aquifer are communicated through fault conduction, the hydraulic connection is formed, water sources are mutually supplied, gushing water is increased in geometric multiple relative to the treatment difficulty under the condition of a single aquifer, and the water trouble is difficult to eliminate.
Based on the construction method, the applicant provides a construction method for stoping the fault waterproof coal pillar under the condition of the upper and lower aquifers, and aims at realizing safe and efficient stoping of the fault waterproof coal pillar by the construction method of 'one section', 'two drops', 'three plugs', 'four supplements' when the hydraulic connection is enhanced due to the influence of faults on the top aquifer and the bottom aquifer.
As shown in fig. 1 and 2, the construction method for stoping the fault waterproof coal pillar under the condition of the upper and lower aquifers comprises the following steps:
S101, determining a projection area of a mining area of a fault waterproof coal pillar on the ground, and drilling holes downwards from the ground in the projection area of the fault waterproof coal pillar;
step S102, grouting faults through drilling, and cutting off hydraulic connection between the top plate aquifer and the bottom plate aquifer;
Step S103, grouting is carried out after the water in the top plate aquifer is drained, and the top plate aquifer is transformed into a weak aquifer or a water-resisting layer;
Step S104, grouting is carried out above the bottom plate aquifer, and the thickness of the bottom plate aquifer is increased;
and step 105, performing supplementary grouting through drilling in response to abnormal water gushing of the top water-bearing layer and the bottom water-bearing layer.
In the application, the geological structures and the hydraulic relations of the top plate aquifer and the bottom plate aquifer are determined through geological survey of the top plate aquifer and the bottom plate aquifer, and the mining area of the fault waterproof coal pillar, namely the mining area of the fault waterproof coal pillar, and in addition, the mining area can be calculated and verified through the reserved width of the fault waterproof coal pillar.
After the mining area of the broken waterproof coal pillar is determined, the mining area of the broken waterproof coal pillar is projected to the ground area, a main drilling hole is drilled underground from the ground in the projection area of the broken waterproof coal pillar, when the main drilling hole is drilled to a first preset distance above a roof aquifer, three secondary drilling holes are independently drilled at the hole bottom of the main drilling hole, one secondary drilling hole is drilled to the roof aquifer, one secondary drilling hole is drilled to a fault zone, and the other secondary drilling hole is drilled to a second preset distance above a bottom plate aquifer.
In the present application, when the main borehole is drilled [10, 20] meters above the roof aquifer, the secondary borehole is started to be drilled at the bottom of the hole of the main borehole. Specifically, as three secondary drilling holes are required to be independently drilled at the bottom of the main drilling hole, the drilling of the independent drilling holes is influenced by the drilling depth of the main drilling hole, and in the method, when the main drilling hole is drilled 10 meters above the roof aquifer, the secondary drilling hole is started to be drilled so that the secondary drilling hole can be drilled; the secondary drilling holes corresponding to the bottom plate aquifer are applied to the range of [0,5] m above the bottom plate aquifer, so that the phenomenon that drilling water gushes when directly entering the bottom plate aquifer is effectively avoided.
When the hydraulic connection between the top plate aquifer and the bottom plate aquifer is cut off, grouting is carried out on the fault zone through a secondary drilling hole which is applied to the fault zone, drilling and coring are carried out on the fault zone after grouting, and the hydraulic connection between the top plate aquifer and the bottom plate aquifer is cut off according to the core strength and the core integrity of the fault zone, so that the hydraulic connection between the top plate aquifer and the bottom plate aquifer is realized. Here, when the core strength of the fault zone is increased by 1.5 times or more than the initial strength and the core integrity is increased by 50% or more, the hydraulic connection between the roof aquifer and the floor aquifer is cut off.
Specifically, based on a working face geological model of the fault waterproof coal pillar, carrying out a fault waterproof coal pillar stoping numerical test to determine the maximum bottom plate damage depth and the maximum top plate damage depth; dividing the fault zone into a filling zone, a reinforcing zone and a plugging zone from the bottom plate aquifer upwards in sequence according to the maximum top plate damage depth and the maximum top plate damage depth; grouting the filling section of the fault zone, and cutting off water gushing from the bottom plate water-bearing layer to the fault zone; grouting is carried out on the reinforced section of the fault zone, and water gushing from the top plate aquifer or the bottom plate aquifer to the working surface of the fault waterproof coal pillar through the fault zone is blocked; ; grouting is carried out on the plugging section of the fault zone, and water gushing from the roof aquifer to the fault zone is blocked, as shown in figure 2.
According to the application, the mining area of the fault waterproof coal pillar is determined through geological parameters of the working face, the fault, the roof aquifer and the bottom plate aquifer, a working face geological model is established, a working face fault waterproof coal pillar stoping numerical test is carried out, and a bottom plate damage area and a top plate damage area are divided.
Different areas in the fault zone are different from the hydraulic connection of the aquifer, the fault zone is divided into three sections according to the maximum bottom plate damage depth and the maximum top plate damage depth in the stope value test, and a filling section, a reinforcing section and a plugging section are sequentially arranged from the bottom plate aquifer upwards. The filling section is communicated with the bottom plate aquifer, the blocking section is communicated with the top plate aquifer, and the reinforcing section is a transition zone communicated with the top plate aquifer and the bottom plate aquifer.
Because the water pressure of roof aquifer, bottom plate aquifer is big, and water burst speed is fast, and the water burst is big, therefore, adopts the high expansion polyurethane water shutoff filling material that has high expansion rate to the slip casting of fault area for the slip casting material can quick expansion after the slip casting of fault area, effectively strengthens the water shutoff effect to roof aquifer, bottom plate aquifer.
When reforming transform the roof aquifer, dredge the water to the roof aquifer, respond to the water pressure of roof aquifer and reduce to predetermineeing the water pressure threshold value, and the water content reduces to first predetermineeing the water content, slip casting is carried out to the roof aquifer, until the water pressure of roof aquifer reduces to the second predetermineeing the water content after, carry out the core of holing to the roof aquifer, confirm that the rock core intensity of roof aquifer reaches first predetermineeing intensity, up to this point, the improvement of roof aquifer is accomplished.
In the application, the water is firstly drained to the roof aquifer, the water pressure and the water content of the roof aquifer are reduced, then grouting is carried out, the roof aquifer is transformed into a weak aquifer or a water-resisting layer, and the 'two-drop' of no sudden water surge of the roof during the stoping of the fault waterproof coal pillar is realized. In the water drainage process of the roof aquifer, the water pressure of the roof aquifer is reduced by [1,2] MPa compared with the initial water pressure, the water content is reduced to be [0.1,1] L/(s.m), namely, after medium water enrichment, grouting is carried out on the roof aquifer by secondary drilling, the roof aquifer crack is filled, the original water is solidified, a water-containing supply channel is cut off until the water content of the roof aquifer is reduced to be below 0.1L/(s.m), and the roof aquifer is transformed into weak water enrichment. At this time, the roof aquifer is drilled and core-extracted, and if the weak core strength is improved by more than 1.5 times than the initial strength through the point load test, the floor aquifer is transformed into a water-resisting layer.
When reforming transform the bottom plate aquifer, through grouting bottom plate aquifer top, increase the thickness of bottom plate aquifer, reform transform former water-proof layer adjacent stratum into the water-proof layer, improve stratum intensity, effectively resist bottom plate aquifer pressure.
After grouting the upper part of the bottom plate aquifer, carrying out core drilling on the bottom plate aquifer, and responding to the core strength of the bottom plate aquifer being more than 1.5 times of the original front degree, judging that the unit water inflow of the bottom plate aquifer is less than or equal to 0.1L/(s.m), and completing the plugging of the bottom plate aquifer to realize the three plugging of the bottom plate aquifer.
In the application, grouting is carried out through secondary drilling, and mainly aims at a fault area between a top plate aquifer and a bottom plate aquifer, wherein grouting slurry adopts cement slurry with the water-cement ratio of 0.5:1-0.7:1, and the grouting pressure is [1,2] MP alpha. Wherein, the roof water-bearing layer can also adopt slurry doped with fly ash.
After hydraulic connection between the top plate aquifer and the bottom plate aquifer is cut off, after the transformation of the top plate aquifer and the bottom plate aquifer is completed, the top plate aquifer and the bottom plate aquifer can be subjected to water bursting monitoring through grouting holes, if the grouting holes are plugged, water is respectively applied to the top plate aquifer and the bottom plate aquifer Wen Kong, and the water bursting monitoring is carried out according to the water bursting amount of drilling holes in the fault waterproof coal pillar extraction process; and in response to the fact that the unit water inflow in the process of stoping the fault waterproof coal pillar is greater than or equal to 0.1L/(s.m), the top plate aquifer and the bottom plate aquifer are respectively subjected to supplementary grouting, and the 'four-compensation' of stoping of the working face is realized.
By means of fault zone grouting, hydraulic connection between the roof aquifer and the bottom plate aquifer is cut off, then grouting modification of the roof aquifer is performed, two-drop of water without sudden gushing is achieved during roof stoping, grouting modification of the bottom plate aquifer is performed, and three-blocking of water without sudden gushing is achieved during bottom plate stoping; and the four-supplement during the stoping of the working face is realized by supplementing grouting in time; so that the stoping can be safely and efficiently carried out when the water-bearing layer of the top plate and the water-bearing layer of the bottom plate are affected by faults to strengthen the hydraulic connection.
As shown in fig. 3, the application further provides a construction system for stoping a fault waterproof coal pillar under the condition of an upper aquifer and a lower aquifer, which comprises:
The drilling unit is configured to determine a projection area of a mining area of the fault waterproof coal pillar on the ground, and drill holes downwards from the ground in the projection area of the fault waterproof coal pillar;
The hydraulic cutoff unit is configured to perform grouting on the fault zone through drilling and cut off hydraulic connection between the top plate aquifer and the bottom plate aquifer;
the hydraulic depressurization unit is configured to perform grouting after the top plate aquifer is drained, and reform the top plate aquifer into a weak aquifer or a water-resisting layer;
The hydraulic plugging unit is configured to perform grouting above the bottom plate water-bearing layer and increase the thickness of the bottom plate water-bearing layer;
and the grouting supplementing unit is configured to conduct supplementing grouting through drilling holes in response to abnormal water gushing of the top water-bearing layer and the bottom water-bearing layer.
The construction system for stoping the fault waterproof coal pillar under the condition of the upper and lower aquifers provided by the embodiment of the application can realize the steps and the flow of the construction method for stoping the fault waterproof coal pillar under the condition of the upper and lower aquifers of any embodiment, and achieve the same technical effects, and are not repeated one by one.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (6)
1. A construction method for stoping a fault waterproof coal pillar under the conditions of an upper aquifer and a lower aquifer is characterized by comprising the following steps:
S101, determining a projection area of a mining area of the fault waterproof coal pillar on the ground, and drilling holes downwards from the ground in the projection area of the fault waterproof coal pillar;
Step S102, grouting a fault zone through drilling, and cutting off hydraulic connection between a roof aquifer and a floor aquifer;
Step S103, grouting is carried out after the water in the top plate aquifer is drained, and the top plate aquifer is transformed into a weak aquifer or a water-proof layer;
step S104, grouting is carried out above the bottom plate water-bearing layer, and the thickness of the bottom plate water-bearing layer is increased;
Step 105, in response to the abnormal water burst of the top plate aquifer and the bottom plate aquifer, performing supplementary grouting through drilling;
in the step S101 of the process of the present invention,
And when the main drilling hole is drilled to a first preset distance above the water-bearing layer of the top plate, three secondary drilling holes are drilled at the hole bottom of the main drilling hole, one secondary drilling hole is drilled to the water-bearing layer of the top plate, one secondary drilling hole is drilled to the fault zone, and the other secondary drilling hole is drilled to a second preset distance above the water-bearing layer of the bottom plate.
2. The method for constructing a stope water-proof coal pillar under the condition of an upper and lower aquifer according to claim 1, wherein in step S102,
Grouting the fault zone through a secondary drilling hole applied to the fault zone, drilling and coring the fault zone after grouting, and determining to cut off the hydraulic connection between the top plate aquifer and the bottom plate aquifer according to the core strength and the core integrity of the fault zone.
3. The method for constructing a stope fault waterproof coal pillar under the condition of an upper and lower aquifer according to claim 1, wherein grouting the fault zone in step S102 comprises:
Based on the working face geological model of the fault waterproof coal pillar, carrying out a fault waterproof coal pillar extraction numerical test, and determining the maximum bottom plate damage depth and the maximum top plate damage depth;
dividing the fault zone into a filling zone, a reinforcing zone and a plugging zone from the bottom plate aquifer upwards in sequence according to the maximum top plate damage depth and the maximum top plate damage depth;
Grouting the filling section of the fault zone, and cutting off water gushing from the bottom plate water-bearing layer to the fault zone;
grouting the reinforced section of the fault zone to block water burst from the top plate aquifer or the bottom plate aquifer to the working surface of the fault waterproof coal pillar through the fault zone;
grouting is carried out on the plugging section of the fault zone, and water gushing from the roof aquifer to the fault zone is blocked.
4. The method for constructing a water-proof coal pillar for stoping a fault under the condition of an upper and lower aquifer according to claim 1, wherein in step S103,
And draining the roof aquifer, responding to the fact that the water pressure of the roof aquifer is reduced to a preset water pressure threshold value, reducing the water content to a first preset water content, grouting the roof aquifer until the water pressure of the roof aquifer is reduced to a second preset water content, and then drilling and coring the roof aquifer, wherein the core strength of the roof aquifer is determined to reach the first preset strength.
5. The method for constructing a water-proof coal pillar for a stope under the condition of an upper and lower aquifer according to claim 1, wherein in step S104,
And after grouting is carried out above the bottom plate aquifer, drilling and coring are carried out on the bottom plate aquifer, and if the core strength of the bottom plate aquifer is more than 1.5 times of the original strength, the unit water inflow of the bottom plate aquifer is judged to be less than or equal to , and the plugging of the bottom plate aquifer is completed.
6. The method for constructing a water-proof coal pillar for a stope under the condition of an upper and lower aquifer according to claim 1, wherein in step S105,
And respectively applying hydrological holes to the top plate aquifer and the bottom plate aquifer for water burst monitoring, and respectively carrying out supplementary grouting on the top plate aquifer and/or the bottom plate aquifer in response to the unit water burst amount in the process of stoping the fault waterproof coal pillar being more than or equal to .
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| CN202310868676.1A CN116792099B (en) | 2023-07-14 | 2023-07-14 | Construction method and system for stoping fault waterproof coal pillar under upper and lower aquifer conditions |
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| CN202310868676.1A CN116792099B (en) | 2023-07-14 | 2023-07-14 | Construction method and system for stoping fault waterproof coal pillar under upper and lower aquifer conditions |
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| CN116792099B true CN116792099B (en) | 2024-04-16 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB8709414D0 (en) * | 1986-04-21 | 1987-05-28 | Voest Alpine Ag | Preventing collision between loading ramp & cutting arm |
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