CN110761814A - Roof water control method based on presplitting and grouting modification - Google Patents
Roof water control method based on presplitting and grouting modification Download PDFInfo
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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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
A roof water control method based on pre-splitting and grouting modification comprises the following steps: the method comprises the following steps: determining the height of a water flowing fractured zone of a working surface; step two: determining fracturing and grouting before stoping of a working face; step three: determining a fracturing and grouting horizon; step four: determining the range and thickness of a fracturing and grouting plane; step five: performing hydraulic fracturing on a horizontal hole of a roof rock stratum, namely performing hydraulic fracturing on the rock stratum by constructing a horizontal branch hole on the ground, and fracturing an original continuous medium into a discontinuous medium; step six: grouting a roof rock stratum, and greatly reducing the water passing capacity of the rock stratum; therefore, the rock stratum with good continuity is fractured into the non-continuous rock stratum, and the rock stratum is transformed into the relatively weak waterproof protective layer by adopting the grouting process, so that the dual purposes of inhibiting the upward development of the water-flowing fractured zone and weakening the permeability of the rock stratum are achieved, and the water quantity of the groundwater of the aquifer of the coal seam roof, which flows into the coal mining working face through the water-flowing fractured zone, is reduced.
Description
Technical Field
The invention relates to the technical field of mine water prevention and control and underground water resource protection, in particular to a roof water control method based on pre-splitting and grouting modification, which is used for controlling roof water burst of a coal face by utilizing a drilling pre-splitting and grouting modified rock stratum process in a mineworker coal mine.
Background
The aquifer with loose pores and good water-rich property near the earth surface of the Ordos coal field is an aquifer with important ecological value, and as the mining crack formed by coal seam mining develops to the aquifer of the unconsolidated layer near the earth surface, the underground water enters the coal face along the mining crack, so that the serious problem of roof water damage is generally formed. Aiming at preventing and treating water disaster of a roof, the traditional method is to adopt drilling engineering to drain and lower underground water of a water-bearing stratum in advance, or inhibit the height of a water-conducting crack by means of limiting the coal seam mining height, strip mining and the like, so that the water-conducting crack can not expose the water-bearing stratum with good water-rich property, and further achieve the purpose of eliminating or reducing the water disaster of the roof of a mine. By using the method, the water inflow in the stoping process of the working face is effectively reduced, and the safe stoping of the working face is ensured. However, the method of pre-draining and draining the groundwater of the aquifer in the drilling engineering does not reduce the water discharge of the working face in the whole process of pre-mining, mid-mining and post-mining, and the high-strength draining of the groundwater of the aquifer not only increases the drainage cost of a mine, but also greatly wastes groundwater resources, thereby causing a series of ecological environment problems such as groundwater level reduction, surface water pollution, land salinization and the like. The method for restraining the height of the water flowing fracture by limiting the coal seam mining height, the stripe mining and the like has the problem of great waste of coal resources.
Therefore, how to reduce the protection of water burst and underground water resources on the coal face while ensuring the efficient exploitation of coal resources is a technical problem which is difficult to solve for a long time in the field.
Therefore, in view of the above drawbacks, the present inventors have conducted extensive research and design to overcome the above drawbacks by designing and developing a roof water control method based on pre-splitting and grouting modification, which combines the experience and results of related industries for a long time.
Disclosure of Invention
The invention aims to provide a roof water control method based on pre-splitting and grouting modification, which fractures a rock stratum with good continuity into a discontinuous rock stratum, and then adopts a grouting process to transform the rock stratum into a relatively weak waterproof protective layer so as to achieve the dual purposes of inhibiting the upward development of a water-flowing fracture zone and weakening the permeability of the rock stratum, thereby reducing the water quantity of groundwater of a water-containing layer of a coal seam roof which flows into a coal face through the water-flowing fracture zone.
In order to achieve the purpose, the invention discloses a roof water control method based on drilling pre-splitting and grouting modification, which is characterized by comprising the following steps of:
the method comprises the following steps: determining the height of a water-flowing fractured zone of a working surface, and determining the height of the water-flowing fractured zone according to the mining height and the overlying strata type of a coal bed of the working surface, wherein the water-flowing fractured zone relates to a sandstone aquifer, a natural water-resisting layer and a loose medium aquifer with good water-rich property near the surface above the coal bed after the coal bed is mined;
step two: determining fracturing and grouting before stoping of a working face;
step three: determining a fracturing and grouting layer position, and constructing directional drilling for fracturing and grouting along a ground horizontal directional drilling track on a rock stratum 30-50m below the top of a water flowing fractured zone according to the spatial position of a roof aquifer related to the water flowing fractured zone;
step four: determining the range and thickness of a fracturing and grouting plane;
step five: performing hydraulic fracturing on a horizontal hole of a roof rock stratum, namely performing hydraulic fracturing on the rock stratum by constructing a horizontal branch hole on the ground, and fracturing an original continuous medium into a discontinuous medium;
step six: and grouting the top plate rock stratum, filling the pre-fractured fractures and the primary fractures, and modifying the rock stratum into an artificial water-resisting layer with low water passing capacity, so that the water passing capacity of the rock stratum is greatly reduced.
Wherein: in the first step, according to the coal seam mining height and the overlying strata type of the working face, determining the height of a water-flowing fractured zone by using a first table in the specification of building, water body, railway and main roadway coal pillar reservation and coal pressing mining:
watch 1
Wherein: sigma M is the accumulated mining thickness, the application range of the formula is 1-3M of the single-layer mining thickness, and the accumulated mining thickness is not more than 15M.
Wherein: and in the fourth step, determining the plane influence range of the goaf according to the actually measured rock stratum movement angle or empirical data of the mining area, and calculating the width of the water-conducting fracture zone according to the rock stratum movement angle empirical data of 75 degrees so as to determine the fracturing and grouting boundary.
Wherein: in the fourth step, determining the thickness of a grouting isolation layer according to the thickness of a water-proof safe coal pillar protection layer for coal mining under water in the Specifications for building, water, railway and main roadway coal pillar setting and coal-pressing mining, which is shown in the second table;
watch two
And determining the grouting modification plane range and the vertical thickness according to the goaf influence range and the protective layer thickness formula.
Wherein: in the sixth step, the grouting material is bentonite cement paste, and the formed isolation layer has higher plastic strength and stronger impermeability, can reduce the permeability of the rock stratum and inhibit the upward development of the water diversion fractures.
Wherein: in step six, the grouting process comprises the following steps:
1) grouting mode: an orifice grout stopping and static pressure subsection descending grouting method is adopted;
2) slurry concentration: in the grouting process, firstly, performing test grouting by using slurry, knowing the size of the slurry intake and the pressure condition of an orifice, observing the conditions of slurry stringing and the like of adjacent holes, and adjusting the slurry concentration;
3) grouting pressure: the grouting stable pressure is 2-2.5 times greater than the maximum hydrostatic pressure of the aquifer to be grouted;
4) and (5) finishing grouting standard: and when the grouting pressure reaches the end standard, gradually shifting to reduce the pump amount until the pump amount reaches 50L/min, maintaining for 30min, and performing a water pressing test to determine that the unit water absorption q is not more than 0.01L/min m.m.m, namely determining that the section reaches the grouting end standard.
Wherein: the grouting process also comprises the following steps:
5) and (3) grouting effect inspection:
(1) step and stage inspection: the later branch drilling hole is used for checking the grouting effect of the early grouting main hole through a water pressing test;
(2) quality inspection hole: and judging the grouting effect by observing the conditions of the water pressure and the leakage quantity in the inspection hole.
From the above, the roof water control method based on pre-splitting and grouting modification of the invention has the following effects:
1. on one hand, the original continuous medium rock stratum is fractured into a non-continuous medium by adopting a drilling and pre-fracturing rock stratum process, so that the aim of effectively inhibiting the development height of a water-flowing fracture zone of a coal seam is fulfilled, the spatial range of exposing a water-flowing fracture to a water-bearing layer is reduced, and the water supply capacity of the water-bearing layer is reduced; on the other hand, the soft grouting materials such as bentonite and the like are adopted to fill the pre-splitting cracks and the native cracks, the rock stratum is modified into an artificial water-proof protective layer with low water passing capacity, and the water passing capacity of the rock stratum can be greatly reduced, so that the water quantity flowing into the coal mining working face is reduced from two aspects of reducing the water supply capacity of the aquifer and the water passing capacity of the rock stratum based on the drilling pre-splitting and grouting modified roof water control method, and the problems of large mine drainage quantity, high drainage and drainage engineering cost, large water resource waste, surface ecological damage and the like caused by the water drainage method while ensuring the efficient exploitation of coal resources are effectively solved.
2. 1) before stoping of a working face, a drilling, pre-splitting and grouting combined process is adopted to fracture an original hard rock stratum medium with good continuity into a discontinuous soft rock stratum medium, so that the aim of effectively inhibiting the development height of a water-flowing fractured zone mined by a coal seam is fulfilled, and the spatial range of a water-flowing fractured exposed aquifer and the water supply capacity are reduced;
2) the grouting material is soft grouting material such as bentonite, so that the formed waterproof protective layer has good ductility and high plastic strength, has high damage resistance and weak water passing capacity under coal seam mining disturbance, and can remarkably inhibit the upward development of water-flowing cracks and reduce the leakage of underground water along the grouting layer.
3) The method is characterized in that a water-flowing fractured zone is selected to be 30-50m below the top of the water-flowing fractured zone as a grouting layer, the rock stratum is modified into an artificial water-resisting layer with low water passing capacity while the upward development of the water-flowing fractured zone is effectively inhibited, the water supply capacity and the water passing capacity of the rock stratum are greatly reduced, and the water amount of a water-containing layer flowing into a goaf through the water-flowing fractured zone is effectively reduced.
The details of the present invention can be obtained from the following description and the attached drawings.
Drawings
FIG. 1 shows a schematic diagram of the development height of a water-conducting crack zone of a coal face and water burst of an aquifer under the condition of no presplitting grouting;
FIG. 2 shows a schematic view of hydraulic fracturing of a horizontal hole of a roof before stoping of a coal face;
FIG. 3 shows a schematic diagram of hydraulic fracturing grouting of a horizontal hole of a top plate before stoping of a coal face;
fig. 4 shows the development height of the coal face water-guiding crack zone and the water burst of the aquifer under the condition of presplitting grouting.
Reference numerals:
1-1 goaf; 1-2, a coal face water guide crack zone boundary under the condition of no presplitting grouting; 2. a bulk aqueous medium layer; 3. a natural water barrier; 4. a sandstone aquifer; 5. a coal seam; 6. groundwater flow direction of the bulk medium aquifer; 7. groundwater flow direction of sandstone aquifers; 8. a ground horizontal directional drilling track; 9. hydraulic fracturing of fractures; 10. grouting layer; 11. the development height of a water guide crack zone of the coal face under the condition of presplitting grouting; 12. the flow direction of the underground water of the loose medium aquifer of the pre-cracked and grouted coal face under the condition of stoping is changed; 13. and (3) flowing the groundwater of the sandstone aquifer under the condition of stoping of the pre-cracked and grouted coal face.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be understood that when the terms "comprises" and "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and or combinations thereof.
As described in the background section, the aquifer with good water-rich loose pores near the surface of the deldos coal field is an aquifer with important ecological value, and as mining fractures formed by coal mining develop to the aquifer of the aquifer near the surface of the loose layer, underground water enters the coal face along the mining fractures, so that a serious problem of roof water damage is generally formed. Aiming at preventing and treating water disaster of a roof, the traditional method is to adopt drilling engineering to drain and lower underground water of a water-bearing stratum in advance, or inhibit the height of a water-conducting crack by means of limiting the coal seam mining height, strip mining and the like, so that the water-conducting crack can not expose the water-bearing stratum with good water-rich property, and further achieve the purpose of eliminating or reducing the water disaster of the roof of a mine. By using the method, the water inflow in the stoping process of the working face is effectively reduced, and the safe stoping of the working face is ensured. However, the method of pre-draining and draining the groundwater of the aquifer in the drilling engineering does not reduce the water discharge of the working face in the whole process of pre-mining, mid-mining and post-mining, and the high-strength draining of the groundwater of the aquifer not only increases the drainage cost of a mine, but also greatly wastes groundwater resources, thereby causing a series of ecological environment problems such as groundwater level reduction, surface water pollution, land salinization and the like. The method for restraining the height of the water flowing fracture by limiting the coal seam mining height, the stripe mining and the like has the problem of great waste of coal resources. Therefore, how to reduce the protection of water burst and underground water resources on the coal face while ensuring the efficient exploitation of coal resources is a technical problem which is difficult to solve for a long time in the field. The invention provides a roof water control method based on drilling pre-splitting and grouting modification.
The invention is further explained by taking a typical working face of an Ordos basin as an example and combining the attached drawings and an embodiment, and the roof water control method based on drilling pre-splitting and grouting modification comprises the following steps:
the method comprises the following steps: determining the height of a water-flowing fractured zone of a working face, wherein the working face is provided with a goaf 1-1, and determining the height of the water-flowing fractured zone by using a formula recommended in the specification of coal pillar reservation and coal pressing exploitation of buildings, water bodies, railways and main roadways according to the coal seam mining height and the overlying strata type of the working face (see the following table I). As can be seen from the figure 1, after the coal seam is mined, the water-conducting fractured zone relates to a slate water-bearing stratum 4, a natural water-resisting stratum 3 and a loose medium water-bearing stratum 2 with good near-surface water-rich property above the coal seam 5, and underground water of each water-bearing stratum enters a mined-out area 1-1 along the water-conducting fractured zone from a coal face water-conducting fractured zone boundary 1-2 under the condition of non-presplitting grouting, wherein the figure 1 shows that the underground water flow direction 6 of the loose medium water-bearing stratum of the coal face without presplitting grouting under the mining condition and the underground water flow direction 7 of the sandstone water-bearing stratum of the coal face without presplitting grouting under the mining condition cause the loss of a large amount of gushing water of a roof of the coal face and the underground water of the loose medium water-bearing stratum with good near-surface.
Watch 1
Wherein: 1. and sigma M is the accumulated thickness.
2. The application range of the formula is as follows: the single-layer mining thickness is 1-3 m, and the accumulated mining thickness is not more than 15 m.
3. The plus or minus term in the calculation formula is the middle error.
Step two: and (3) determining the fracturing and grouting time, wherein the working face stoping can destroy a loose aquifer with ecological protection significance, and meanwhile, the mine water inflow is increased, so that the safety stoping of the working face is influenced, therefore, before coal seam mining, the construction drilling of the roof rock stratum of the working face needs to be conducted to fracture and grouting, an artificial waterproof protective layer is constructed, and as shown in the figure 2-3, the roof rock stratum is fractured and grouted before the working face stoping.
Step three: and (3) determining a fracturing and grouting layer position, constructing directional drilling for fracturing and grouting (shown in figures 2-3) on a rock stratum 30-50m below the top of the water-flowing fractured zone along a ground horizontal directional drilling track 8 according to the spatial position of a roof aquifer related to the water-flowing fractured zone, and constructing an artificial isolation layer. And determining the final hole level of the directional horizontal hole according to the development height of the water flowing fractured zone of the coal face under the condition of no pre-splitting grouting as shown in the figure 2.
Step four: determining the range and thickness of a fracturing and grouting plane: and determining the plane influence range of the goaf according to the actually measured rock stratum movement angle or empirical data of the mining area. Determining the thickness of a grouting isolation layer according to the thickness of a water-proof safe coal pillar protective layer for coal mining under water in the Specification for coal pillar setting and coal-pressing mining of buildings, water bodies, railways and main roadways (the following table II);
1) the ore has no actually measured rock stratum moving angle, and the experimental data is taken for 75 degrees to calculate the goaf influence range;
2) the thickness calculation formula of the protective layer of the underwater coal mining waterproof safety coal pillar in the standard of coal pillar reservation and coal pressing mining of buildings, water bodies, railways and main roadways is shown in the second table:
watch two
3) And determining the grouting modification plane range and the vertical thickness according to the goaf influence range and the protective layer thickness formula.
As shown in fig. 2 to fig. 3, the width of the water-conducting fracture zone is calculated according to the empirical data of the rock stratum movement angle of 75 degrees, so as to determine the fracture and grouting boundary; and calculating the thickness of the protective layer according to the type of the overlying strata and the thickness of the loose layer, so as to determine the fracturing and grouting thickness.
Step five: and performing hydraulic fracturing on the horizontal hole of the roof rock stratum, performing hydraulic fracturing on the rock stratum to form a hydraulic fracturing fracture 9 by constructing the horizontal branch hole on the ground, and fracturing the original continuous medium into a discontinuous medium, thereby achieving the purpose of effectively inhibiting the development height of the mining water diversion fracture zone of the coal bed.
As shown in fig. 2, the final pore layer of the horizontal hole on the ground is 30-50m below the top of the water flowing fractured zone, and hydraulic fracturing is performed on the rock stratum to fracture the original continuous medium into a discontinuous medium.
Step six: the top plate rock stratum is grouted, bentonite cement slurry is selected as a grouting material, an isolation layer formed by the bentonite cement slurry has high plastic strength and high impermeability, the rock stratum permeability can be reduced, upward development of a water diversion crack is inhibited, a grouting layer 10 is formed by grouting the fractured rock stratum through a ground horizontal hole, a pre-fractured crack and a primary crack are filled, the rock stratum is modified into an artificial water-resisting layer with low water passing capacity, and the water passing capacity of the rock stratum can be greatly reduced. As shown in fig. 3, the preferred grouting process is as follows:
1) grouting mode: an orifice grout stopping and static pressure subsection descending grouting method is adopted;
2) slurry concentration: in the grouting process, firstly, performing test grouting by using slurry, knowing the size of the slurry draught of the hole and the pressure condition of the orifice, observing whether adjacent holes are connected with slurry or not, and adjusting the slurry concentration;
3) grouting pressure: the grouting stable pressure is 2-2.5 times greater than the maximum hydrostatic pressure of the aquifer to be grouted;
4) and (5) finishing grouting standard: and when the grouting pressure reaches the end standard, the pump amount is gradually shifted and reduced until the pump amount reaches 50L/min and is maintained for 30 min. And then carrying out a pressurized water test (the test pressure is 80% of the end pressure), and determining that the section reaches the grouting end standard when the unit water absorption rate q is not more than 0.01L/min m. Otherwise, requiring reinjection until reaching the end standard;
5) and (3) grouting effect inspection:
(1) step and stage inspection: the later branch drilling hole is used for checking the grouting effect of the early grouting main hole through a water pressing test;
(2) quality inspection hole: and judging the grouting effect by observing the conditions of the water pressure and the leakage quantity in the inspection hole.
Therefore, the beneficial effects of the invention are as follows:
1) the method comprises the steps that a drilling pre-splitting rock stratum process is adopted before stoping of a working face, an original continuous medium rock stratum is fractured into a discontinuous medium, the purpose of effectively inhibiting the development height of a water-flowing fracture zone of coal seam mining is achieved, the space range and the water supply capacity of a water-flowing fracture exposed aquifer are reduced, and as shown in figure 4, the flow direction 12 of loose medium aquifer underground water of a pre-splitting grouting coal working face under the stoping condition and the flow direction 13 of sandstone aquifer underground water of a pre-splitting grouting coal working face under the stoping condition are shown, so that the development height 11 of the water-flowing fracture zone of the coal working face under the pre-splitting grouting condition is less than that of the loose aquifer under the intervention of a manual isolation layer;
2) the grouting material adopted is bentonite cement slurry, so that the formed isolation layer has higher plastic strength, has stronger anti-damage capability under disturbance of coal seam mining, and can obviously inhibit the upward development of water flowing cracks, as shown in figure 4, the constructed artificial isolation layer has high plastic strength and strong anti-damage capability, and the water flowing crack zone cannot develop into a loose water-bearing layer;
3) the method is characterized in that a water flowing fractured zone is selected to be a grouting layer with the height of 30-50m below the top of the water flowing fractured zone, the rock stratum is modified into an artificial water-resisting layer with low water passing capacity while the upward development of the water flowing fractured zone is effectively inhibited, the water passing capacity of the rock stratum can be greatly reduced, and the water amount of a water-bearing layer flowing into a goaf through the water flowing fractured zone is effectively reduced, as shown in comparison of the figure 1 and the figure 4, when pre-splitting grouting is not performed, a coal seam roof sandstone water-bearing layer (4), a natural water-bearing layer (3) and a loose medium water-bearing layer (2) with good near-surface water-rich property are exposed in the water flowing fractured zone of the coal mining working face, and underground water of the water-bearing layer of the loose medium with good near-surface water. During pre-splitting grouting, the development height of a water guide crack of the coal face is obviously reduced, the water guide crack only develops until the lower part of a waterproof protective layer is formed by the fracturing grouting, sandstone aquifer water flows into a goaf along the water guide crack, and groundwater of a loose medium aquifer with good near-surface water-rich property keeps flowing direction before mining, does not flow into the goaf, and does not cause groundwater leakage of the aquifer.
It should be apparent that the foregoing description and illustrations are by way of example only and are not intended to limit the present disclosure, application or uses. While embodiments have been described in the embodiments and depicted in the drawings, the present invention is not limited to the particular examples illustrated by the drawings and described in the embodiments as the best mode presently contemplated for carrying out the teachings of the present invention, and the scope of the present invention will include any embodiments falling within the foregoing description and the appended claims.
Claims (7)
1. A roof water control method based on drilling pre-splitting and grouting modification is characterized by comprising the following steps:
the method comprises the following steps: determining the height of a water-flowing fractured zone of a working surface, and determining the height of the water-flowing fractured zone according to the mining height and the overlying strata type of a coal bed of the working surface, wherein the water-flowing fractured zone relates to a sandstone aquifer, a natural water-resisting layer and a loose medium aquifer with good water-rich property near the surface above the coal bed after the coal bed is mined;
step two: determining fracturing and grouting before stoping of a working face;
step three: determining a fracturing and grouting layer position, and constructing directional drilling for fracturing and grouting along a ground horizontal directional drilling track on a rock stratum 30-50m below the top of a water flowing fractured zone according to the spatial position of a roof aquifer related to the water flowing fractured zone;
step four: determining the range and thickness of a fracturing and grouting plane;
step five: performing hydraulic fracturing on a horizontal hole of a roof rock stratum, namely performing hydraulic fracturing on the rock stratum by constructing a horizontal branch hole on the ground, and fracturing an original continuous medium into a discontinuous medium;
step six: and grouting the top plate rock stratum, filling the pre-fractured fractures and the primary fractures, and modifying the rock stratum into an artificial water-resisting layer with low water passing capacity, so that the water passing capacity of the rock stratum is greatly reduced.
2. The method for roof water control based on drilling pre-splitting and grouting modification of claim 1, wherein: in the first step, according to the coal seam mining height and the overlying strata type of the working face, determining the height of a water-flowing fractured zone by using a first table in the specification of building, water body, railway and main roadway coal pillar reservation and coal pressing mining:
watch 1
Wherein: sigma M is the accumulated mining thickness, the application range of the formula is 1-3M of the single-layer mining thickness, and the accumulated mining thickness is not more than 15M.
3. The method for roof water control based on drilling pre-splitting and grouting modification of claim 1, wherein: and in the fourth step, determining the plane influence range of the goaf according to the actually measured rock stratum movement angle or empirical data of the mining area, and calculating the width of the water-conducting fracture zone according to the rock stratum movement angle empirical data of 75 degrees so as to determine the fracturing and grouting boundary.
4. The method for roof water control based on drilling pre-splitting and grouting modification of claim 1, wherein: in the fourth step, determining the thickness of a grouting isolation layer according to the thickness of a water-proof safe coal pillar protection layer for coal mining under water in the Specifications for building, water, railway and main roadway coal pillar setting and coal-pressing mining, which is shown in the second table;
watch two
And determining the grouting modification plane range and the vertical thickness according to the goaf influence range and the protective layer thickness formula.
5. The method for roof water control based on drilling pre-splitting and grouting modification of claim 1, wherein: in the sixth step, the grouting material is bentonite cement paste, and the formed isolation layer has higher plastic strength and stronger impermeability, can reduce the permeability of the rock stratum and inhibit the upward development of the water diversion fractures.
6. The method for roof water control based on drilling pre-splitting and grouting modification of claim 1, wherein: in step six, the grouting process comprises the following steps:
1) grouting mode: an orifice grout stopping and static pressure subsection descending grouting method is adopted;
2) slurry concentration: in the grouting process, firstly, performing test grouting by using slurry, knowing the size of the slurry intake and the pressure condition of an orifice, observing the conditions of slurry stringing and the like of adjacent holes, and adjusting the slurry concentration;
3) grouting pressure: the grouting stable pressure is 2-2.5 times greater than the maximum hydrostatic pressure of the aquifer to be grouted;
4) and (5) finishing grouting standard: and when the grouting pressure reaches the end standard, gradually shifting to reduce the pump amount until the pump amount reaches 50L/min, maintaining for 30min, and performing a water pressing test to determine that the unit water absorption q is not more than 0.01L/min m.m.m, namely determining that the section reaches the grouting end standard.
7. The method for roof water control based on drilling pre-splitting and grouting modification of claim 6, wherein: the grouting process also comprises the following steps:
5) and (3) grouting effect inspection:
(1) step and stage inspection: the later branch drilling hole is used for checking the grouting effect of the early grouting main hole through a water pressing test;
(2) quality inspection hole: and judging the grouting effect by observing the conditions of the water pressure and the leakage quantity in the inspection hole.
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| CN111365003A (en) * | 2020-03-11 | 2020-07-03 | 西安科技大学 | Combined subsidence reducing method for grouting of separation layer inner bag and plugging of water flowing fractured zone |
| CN111894671A (en) * | 2020-08-14 | 2020-11-06 | 山东科技大学 | Ground water pumping hole pumping and draining method aiming at working face top plate separation layer water damage |
| CN111764960A (en) * | 2020-08-17 | 2020-10-13 | 六盘水师范学院 | Coal mining separation layer water damage prevention and control method |
| CN111894588A (en) * | 2020-08-17 | 2020-11-06 | 中煤地质集团有限公司 | Grouting treatment method for coal seam roof ultra-thick water-containing layer area |
| CN111894588B (en) * | 2020-08-17 | 2022-04-05 | 中煤地质集团有限公司 | Grouting treatment method for coal seam roof ultra-thick water-containing layer area |
| CN111764960B (en) * | 2020-08-17 | 2021-11-12 | 六盘水师范学院 | Coal mining separation layer water damage prevention and control method |
| CN112253187B (en) * | 2020-09-27 | 2022-03-11 | 中煤科工集团西安研究院有限公司 | Method for inhibiting mining damage depth based on clay-based slurry advanced grouting modified bottom plate hard rock |
| CN112253187A (en) * | 2020-09-27 | 2021-01-22 | 中煤科工集团西安研究院有限公司 | Method for inhibiting mining damage depth based on clay-based slurry advanced grouting modified bottom plate hard rock |
| WO2022081790A1 (en) * | 2020-10-16 | 2022-04-21 | Aera Energy Llc | Grout partition and method of construction |
| CN112302718A (en) * | 2020-10-29 | 2021-02-02 | 中煤科工集团西安研究院有限公司 | Method for protecting water resource of water-bearing stratum of coal seam roof |
| CN112377221B (en) * | 2020-10-30 | 2022-09-23 | 中煤科工集团西安研究院有限公司 | Method for inhibiting development of water guide crack belt by grouting before mining and building key layer of structure |
| CN112377221A (en) * | 2020-10-30 | 2021-02-19 | 中煤科工集团西安研究院有限公司 | Method for inhibiting development of water guide crack belt by grouting before mining and building key layer of structure |
| CN112879045A (en) * | 2021-02-03 | 2021-06-01 | 中煤科工集团西安研究院有限公司 | Method for building deep-buried huge-thickness solution gap fracture aquifer curtain |
| CN113250684A (en) * | 2021-04-22 | 2021-08-13 | 内蒙古上海庙矿业有限责任公司 | Water-rich property evaluation and water damage grading prevention and control method for Jurassic system water-rich soft rock |
| CN113175325A (en) * | 2021-04-25 | 2021-07-27 | 中国矿业大学 | Coal and intergrown sandstone type uranium ore coordinated mining method based on key layer protection |
| CN113175325B (en) * | 2021-04-25 | 2022-03-08 | 中国矿业大学 | Coal and intergrown sandstone type uranium ore coordinated mining method based on key layer protection |
| CN113309109A (en) * | 2021-05-26 | 2021-08-27 | 广西壮族自治区地质环境监测站 | Construction method for quickly blocking water and reinforcing near pit wall of deep foundation pit in loose soil layer |
| CN113217043A (en) * | 2021-05-28 | 2021-08-06 | 中煤科工集团西安研究院有限公司 | Efficient and rapid plugging method and construction method for water source with water inrush fault water guide zone |
| CN113404484A (en) * | 2021-07-27 | 2021-09-17 | 中国矿业大学 | Ground double-bare-hole combined monitoring method for internal movement of water-rich stratum mining rock stratum |
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| CN113653510B (en) * | 2021-08-31 | 2022-04-22 | 中国矿业大学 | CO2Method for blocking rock stratum microcrack permeation by mineralized nano silica gel grouting material |
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