CN116335668A - Method for treating mining subsidence land of shallow-buried coal seam in channel region - Google Patents
Method for treating mining subsidence land of shallow-buried coal seam in channel region Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000005065 mining Methods 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 134
- 239000002689 soil Substances 0.000 claims abstract description 110
- 238000003860 storage Methods 0.000 claims abstract description 56
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims description 15
- 239000010802 sludge Substances 0.000 claims description 10
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- 239000004575 stone Substances 0.000 claims description 6
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- 239000004576 sand Substances 0.000 claims description 4
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- 230000008901 benefit Effects 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 230000010485 coping Effects 0.000 abstract description 4
- 230000002269 spontaneous effect Effects 0.000 abstract description 4
- 229910001385 heavy metal Inorganic materials 0.000 description 9
- 239000004567 concrete Substances 0.000 description 5
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- 238000007726 management method Methods 0.000 description 4
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- 230000005484 gravity Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- 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 OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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Abstract
The invention discloses a method for treating a mining subsidence land of a shallow coal seam in a channel region, which comprises the following steps of dividing treatment strips; step two, mining subsidence land zonal treatment: the method comprises the steps of sequentially treating a plurality of treatment strips in a downstream-to-upstream sequence, firstly stripping and digging a subsidence land treatment area, and then filling a bottom water-resisting layer, a bottom water-bearing layer, a bottom soil layer, a top water-resisting layer, a water storage type core soil layer and a surface soil layer from bottom to top sequentially, and simultaneously setting a impervious wall and a drainage ditch. According to the invention, residual coal is recovered through stripping and digging type treatment, the spontaneous combustion hidden danger is removed, layered backfilling is carried out, the hidden danger of roof collapse is eliminated, a sponge stratum structure suitable for ecological restoration is reconstructed, water can be stored, permeated and purified during raining, the stored water is released and utilized during drought, the ecological restoration effect of a subsidence area and the capability of coping with natural disasters are improved, and the social and ecological benefits of a treatment area are improved.
Description
Technical Field
The invention belongs to the technical field of treatment of coal seam mining subsidence land, and particularly relates to a method for treating a mining subsidence land of a shallow-buried coal seam in a channel region.
Background
The coal resources in the northern areas of the Shaanxi of China are rich, and a large-area goaf is formed due to years of exploitation. The coal seam in the channel area is shallow, the average burial depth is about 35m, and although measures such as protecting coal pillars and coal tops are reserved for preventing collapse during mining of a mine, the goaf is not subjected to backfilling operation, the goaf has longer time, and various disturbances still cause the goaf to collapse under the action of gravity; mining subsidence not only causes a large number of subsidence cracks on the ground surface to destroy the shape of the ground surface, but also causes the subsidence cracks to directly reach the goaf, so that the residual coal in the goaf is directly contacted with air, spontaneous combustion of the residual coal is initiated, and harmful gases such as CO are discharged to influence the surrounding environment. Specific measures must be taken to scientifically treat such coal mining subsidence areas. At present, the modes adopted in the prior art are simple crack filling or large-scale stripping and digging fire extinguishing, and the system consideration is lacking. Crack filling cannot fundamentally solve the problem, and large-scale stripping and digging treatment is easy to cause disordered stratum sequence, the soil structure is damaged, and crop planting and ecological restoration are not easy to realize.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for treating the mining subsidence land of a shallow coal seam in a channel region, which comprises the steps of stripping and digging the shallow coal seam, recovering residual coal, removing spontaneous combustion hidden danger, backfilling in layers, eliminating hidden danger of roof collapse, reconstructing a sponge stratum structure suitable for ecological restoration, storing water, permeating water and purifying water in raining, releasing and utilizing the stored water in drought, improving ecological restoration effect of the subsidence region, coping with natural disasters and the like, constructing the earth surface into high-standard farmland suitable for agricultural planting in the treatment region, and improving social benefit, ecological benefit and economic benefit of the treatment region.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for treating a mining subsidence land of a shallow coal seam in a channel region is characterized by comprising the following steps:
step one, dividing treatment strips: dividing the mining subsidence area into a plurality of treatment strips from the downstream of the channel region to the upstream, wherein the width of each treatment strip is 30-50 m;
step two, mining subsidence land zonal treatment: the treatment method of the plurality of treatment strips is the same, and when any treatment strip is treated, the method comprises the following steps:
step 201, stripping soil in the treatment strip until the soil is stripped and excavated to the position above the coal bed bottom plate;
202, arranging a bottom water-resisting layer on a coal seam bottom plate of a stripped and dug treatment strip;
203, constructing a cut-off wall section on the bottom water-resisting layer, wherein the outer side of the cut-off wall section is flush with the outer side of the bottom water-resisting layer;
204, sequentially arranging a bottom aquifer and a bottom soil layer on the bottom water-resisting layer from bottom to top; the top of the bottom soil layer is flush with the top of the impervious wall section, and the bottom water-bearing layer and the bottom soil layer are attached to the impervious wall section;
step 205, arranging a drainage ditch section on one side of a bottom soil layer, wherein the top of the drainage ditch section extends to the upper part of the ground surface of a channel region, the top of the drainage ditch section is open, and a plurality of permeable windows are arranged at the bottom of the drainage ditch section;
and 206, sequentially arranging a top water-resisting layer, a water storage type core soil layer and a surface soil layer from bottom to top in the area where the drainage ditch section is not arranged at the tops of the bottom soil layer and the impervious wall section, wherein the surface of the surface soil layer is flush with the surface of the channel region.
The method for treating the mining subsidence land of the shallow coal seam in the channel region is characterized by comprising the following steps of: the bottom water-resisting layer is arranged close to the top of the coal bed bottom plate, and the bottom water-resisting layer and the top water-resisting layer are paved by adopting stone-separating loess; the bottom aquifer is paved by adopting rock soil of a system delay group in a dwarf system above a coal seam stripped by a treatment strip; the substrate layer is paved by adopting weathered bedrock and rock fragments formed in the stripping and digging process of the treatment strips; the water storage type core soil layer is paved by adopting sand soil of an upper updating system salawusu group; the surface soil layer is paved by adopting a cultivated layer or cured soil stripped and excavated by the treatment strips.
The method for treating the mining subsidence land of the shallow coal seam in the channel region is characterized by comprising the following steps of: when the surface soil layer is paved, the treatment is firstly carried outSpreading urban sludge uniformly on the surface of a cultivated layer or cured soil stripped by a strip, deep ploughing and raking uniformly by a ploughing machine for fertilizer application, paving a surface soil layer by using the soil subjected to fertilizer application, wherein the soil volume weight of the paved surface soil layer is not more than 1.4g/cm 3 。
The method for treating the mining subsidence land of the shallow coal seam in the channel region is characterized by comprising the following steps of: in the second step, when the bottom water-resisting layer, the bottom soil layer, the top water-resisting layer and the surface soil layer are arranged, a bulldozer is adopted for leveling and compacting.
The method for treating the mining subsidence land of the shallow coal seam in the channel region is characterized by comprising the following steps of: in step 201, when the soil body in the treatment strip is peeled and excavated, the stratum is equally divided and peeled and excavated, and the peeled and excavated soil bodies in different strata are classified and stacked.
The method for treating the mining subsidence land of the shallow coal seam in the channel region is characterized by comprising the following steps of: the drainage ditch section comprises two oppositely arranged ditch walls and a plurality of cross beams connected between the bottoms of the two ditch walls, and the water permeable window is formed between two adjacent cross beams.
The method for treating the mining subsidence land of the shallow coal seam in the channel region is characterized by comprising the following steps of: when a plurality of the treatment strips are all treated, the impervious wall sections in the treatment strips are connected together to form an annular impervious wall, the drainage ditch sections are connected together to form a drainage ditch, the impervious wall, the bottom water-resisting layers in all the treatment strips and the top water-resisting layers in all the treatment strips form a water storage system of a box structure, and the drainage ditch is communicated with the water storage system of the box structure.
The method for treating the mining subsidence land of the shallow coal seam in the channel region is characterized by comprising the following steps of: when a treatment strip at the most downstream in the mining subsidence area is treated, after the impervious wall section of the bottom waterproof layer is constructed, a water storage bin is arranged on the bottom waterproof layer in the treatment strip, a pipe well for a water pipe to pass through is arranged at the top of the water storage bin, a plurality of water inlets are formed in the side wall of the water storage bin along the circumferential direction of the water storage bin, a plurality of water filtering plates are arranged at the water inlets, and a crushed stone filtering layer is arranged at the outer side of each water filtering plate; then continuing to treat the treatment strip according to the steps 204 to 206;
the top of the water storage bin is not higher than the top of the bottom soil layer, holes for installing the pipe wells are formed in the top of the water storage bin, and the tops of the pipe wells extend upwards to the upper portion of the surface soil layer.
The method for treating the mining subsidence land of the shallow coal seam in the channel region is characterized by comprising the following steps of: when the treatment of the plurality of treatment strips is finished, a low-pressure pipeline is arranged on the surface soil layer of the treated area; the water supply device comprises a water storage bin, a low-pressure pipeline, a water pipe and a plurality of water supply plugs, wherein the water supply plugs are arranged on the low-pressure pipeline, a water pump for pumping water to the low-pressure pipeline is arranged in the water storage bin, and the water pipe is connected between the water pump and the low-pressure pipeline.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the stripping type treatment is adopted, so that the residual coal can be effectively recovered, the natural hidden danger is removed, meanwhile, the layered backfilling mode is adopted, the hidden danger of roof collapse can be effectively eliminated, and a sponge stratum structure suitable for ecological restoration is reconstructed.
2. According to the invention, the bottom water-proof layer and the top water-proof layer are arranged, the annular impervious wall is built between the outer side edge of the bottom water-proof layer and the outer side edge of the top water-proof layer to form the water storage system with the box-shaped structure, and the drainage ditch with the water permeable window at the bottom is built on the bottom soil layer at one side of the treatment area, so that the upstream surface runoff can be effectively collected into the water storage system of the treatment area, the stratum is a sponge stratum structure capable of storing water, permeating water and purifying water during raining, and the ecological restoration effect of the subsidence area and the capability of coping with natural disasters and the like are improved.
3. According to the invention, the water storage bin is arranged on one side of the bottom water-resisting layer, so that water in the stratum can be stored in the water storage bin, and then water stored in the water storage bin is pumped to the ground by the water pump to irrigate crops on the ground during drought, the ground surface is built into a high-standard farmland suitable for agricultural planting in a treatment area, and the social benefit, ecological benefit and economic benefit of the treatment area are improved.
In summary, the invention recovers residual coal, removes spontaneous combustion hidden trouble, backfills in layers, eliminates hidden trouble of roof collapse, reconstructs a sponge stratum structure suitable for ecological restoration, can store water, permeate water and purify water during raining, releases and utilizes the stored water during drought, improves ecological restoration effect of a subsidence area and capability of coping with natural disasters and the like, builds the earth surface into high-standard farmland suitable for agricultural planting of a treatment area, and improves social benefit, ecological benefit and economic benefit of the treatment area.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic illustration of the division of abatement zones of the present invention.
FIG. 2 is a cross-sectional view of the invention after treatment of a mining subsidence area.
FIG. 3 is a schematic plan view of the wall, drain and reservoir of the present invention.
Fig. 4 is a schematic diagram of the positional relationship between the water filtering plate and the water storage bin of the present invention.
Reference numerals illustrate:
1-treating the strip; 2-a bottom water barrier; 3-bottom aquifer;
4-a substrate layer; 5-a top water barrier; 6-a water storage type core soil layer;
7-surface soil layer; 8, an impervious wall section; 9-draining and infiltrating ditch sections;
9-1-trench walls; 9-2, a cross beam; 10-a water permeable window;
11-a water storage bin; 12-a tube well; 13-low pressure piping;
14-a hydrant; 15-a water filtering plate; 16-coal seam floor.
Detailed Description
A method for treating a mining subsidence land of a shallow coal seam in a channel region as shown in fig. 1 to 4, the method comprising the following steps:
step one, dividing treatment strips: as shown in fig. 1, dividing the mining subsidence area into a plurality of governance strips 1 from the downstream of the channel region to the upstream, wherein the width of each governance strip 1 is 30 m-50 m;
step two, mining subsidence land zonal treatment: the treatment of the plurality of treatment strips 1 is sequentially carried out according to the sequence from the downstream to the upstream, the treatment methods of the plurality of treatment strips 1 are the same, and when any treatment strip 1 is treated, the method comprises the following steps:
step 201, stripping soil in the treatment strip 1 until the soil is stripped to the position above the coal seam floor 16;
step 202, arranging a bottom water-resisting layer 2 on a coal seam bottom plate 16 of the stripped and dug treatment strip 1;
203, constructing a diaphragm wall section 8 on the bottom waterproof layer 2, wherein the outer side of the diaphragm wall section 8 is flush with the outer side of the bottom waterproof layer 2;
step 204, arranging a bottom aquifer 3 and a bottom soil layer 4 on the bottom waterproof layer 2 in sequence from bottom to top; the top of the bottom soil layer 4 is flush with the top of the impervious wall section 8, and the bottom water-bearing layer 3 and the bottom soil layer 4 are attached to the impervious wall section 8;
step 205, arranging a drainage ditch section 9 on one side of the substrate layer 4, wherein the top of the drainage ditch section 9 extends to the upper part of the ground surface of the channel region, and the top of the drainage ditch section 9 is open and the bottom of the drainage ditch section is provided with a plurality of permeable windows 10;
and 206, sequentially arranging a top water-resisting layer 5, a water storage type core soil layer 6 and a surface soil layer 7 from bottom to top in the area where the drainage ditch section 9 is not arranged at the tops of the bottom soil layer 4 and the impervious wall section 8, wherein the surface of the surface soil layer 7 is flush with the surface of the channel region.
When the ecological restoration method is actually used, according to the regional climate and the landform characteristics, from the viewpoints of crop planting and ecological restoration, underground disaster management is combined with stratum reconstruction, residual coal can be effectively recovered by adopting stripping and digging type management according to the characteristics of the stratum in the management region and the ecological restoration requirement, natural hidden danger is removed, and meanwhile, hidden danger of roof collapse can be effectively eliminated by adopting a layered backfilling mode, and a stratum structure suitable for ecological restoration is reconstructed.
It should be noted that, through setting up bottom water-proof layer 2 and top water-proof layer 5, build annular cut-off wall section 8 between the outside border of bottom water-proof layer 2 and the outside border of top water-proof layer 5 and form the retaining system of box structure to construct the drainage infiltration ditch section 9 that the bottom has window 10 that permeates water on the substrate layer 4 of administering strip 1 one side, can effectively collect the upstream surface runoff to the retaining system of administering the district, make this stratum be one can be in the rain when retaining, ooze, the sponge stratum structure of water purification, promote subsidence district ecological restoration effect and reply natural disaster scheduling ability.
In the concrete implementation, the impervious wall section 8 is arranged to prevent the water loss of the bottom aquifer 3, the impervious wall section 8 adopts a concrete structure, and the wall thickness is more than 50cm; the water storage bin 11 adopts a prefabricated reinforced concrete structure, is square, has an external dimension of 5 mm and a thickness of 30cm, and is provided with a water inlet on each of four sides of the water storage bin 11, wherein the water inlet is formed at the 1m height of the side part of the water storage bin 11, the water filtering plate 15 is buried at the water inlet of the water storage bin 11, and small holes of about 5cm are formed in the water filtering plate 15.
In this embodiment, the bottom water-resisting layer 2 is closely attached to the top of the coal seam floor 16, and the bottom water-resisting layer 2 and the top water-resisting layer 5 are paved by adopting loess of stone separation group; the bottom aquifer 3 is paved by adopting the rock soil of a system yan group in the dwarfism system above the coal seam stripped by the treatment strip 1; the substrate layer 4 is paved by adopting weathered bedrock and rock fragments formed in the stripping and digging process of the treatment strip 1; the water storage type core soil layer 6 is paved by adopting sand soil of an upper update system salasu group; the surface soil layer 7 is paved by adopting a cultivated layer or cured soil peeled and dug by the treatment strip 1.
When in actual use, the thickness of the bottom water-proof layer 2 is 1m, the lithology of the loess of the stone group Q2L is brown yellow, brown yellow loam and sandy soil, and the structure is compact, thus being a good water-proof material. Filling by mechanical equipment, leveling by using a bulldozer, and compacting;
the bottom aquifer 3 is positioned on the bottom aquifer 2, and the lithology of the Jurassic system Yan An group J2y is mainly gray coarse, medium and fine feldspar and quartz sandstone. The thickness of the reconstructed bottom aquifer 3 is determined according to the actual amount of rock stripped and the surrounding terrain structure, and mainly the gaps and rock cracks between filled massive rocks are used for storing moisture;
the thickness of the bottom soil layer 4 is 1m, and the thicknesses of the top water-resisting layer 5, the water storage type core soil layer 6 and the surface soil layer 7 are all 50cm;
the lithology of the upper updating system sala Wu Suzu Q3S adopted by the water storage type core soil layer 6 is gray yellow, yellow brown fine sand, silt and subsoil, and more pores exist to store water;
in this embodiment, when the topsoil layer 7 is paved, firstly, uniformly spreading urban sludge on the surface of the cultivated layer or cured soil peeled from the treated strip 1, then, deep ploughing and raking are carried out by using a ploughing machine to uniformly perform fertilizer application, and then, the topsoil layer 7 is paved by using the soil after fertilizer application, wherein the volume weight of the paved topsoil layer 7 is not more than 1.4g/cm 3 。
In actual use, the soil in the area is relatively barren, so that the peeled and dug cultivated layer or cured soil needs to be fertilized by urban sludge. The urban sludge contains rich soil nutrient elements, can improve the physicochemical property and microbiological activity of soil and promote plant growth. However, the urban sludge contains more heavy metals and has great environmental risks, so that the application amount is reasonably determined. The invention proposes to screen a limiting heavy metal element i according to the soil environment background value of a treatment area and the content of heavy metal in sludge based on agricultural land soil pollution risk management and control standard, and then reasonably determine the application amount and control the environmental risk according to the following two formulas;
first, according to
Calculating the environmental capacity of soil heavy metal element i in the treatment area>
Wherein (1)>
In kg/hm 2 ，/>
Is the allowable value of the content of the heavy metal element i in the soil, and the unit is mg/kg,/for the soil>
In order to treat the actual content of the heavy metal element i in the soil in the area, the unit mg/kg is represented by 1.4 in the formula, namely the soil volume weight of the topsoil layer 7;
then, combining the content of the heavy metal element i in the municipal sludge, and determining the allowable application amount of the municipal sludge under the constraint condition of the heavy metal element i
Wherein (1)>
In t/hm 2 ；/>
The content of the heavy metal element i in the municipal sludge is mg/kg.
In the second embodiment, when the bottom water-resisting layer 2, the bottom soil layer 4, the top water-resisting layer 5 and the surface soil layer 7 are set, a bulldozer is adopted to level and compact.
In this embodiment, in step 201, when the soil body in the governing strip 1 is peeled and excavated, the layers are equally divided and peeled and excavated, and the peeled and excavated soil bodies in different layers are classified and stacked.
When in actual use, the treatment process of the strip and the stratum is adopted, so that disturbance to the stratum during stripping and digging can be reduced, the problems that stratum sequence is disordered, soil structure is damaged and crop planting and ecological restoration are difficult to occur in large-scale stripping and digging treatment are avoided, the stripped soil body can be reused according to requirements, and then a sponge stratum structure suitable for ecological restoration can be reconstructed based on the principle that the soil body is completely used according to local conditions.
It should be noted that, when the soil body in each treatment strip is peeled and excavated, the reason for equally dividing the stratum and peeling and piling up the soil bodies after peeling and excavating is that different peeled and excavated soil bodies can be placed in a classified manner, so that the bottom aquifer 3, the bottom soil layer 4 and the surface soil layer 7 can be respectively constructed according to requirements.
In this embodiment, the drainage ditch section 9 includes two oppositely arranged ditch walls 9-1 and a plurality of cross beams 9-2 connected between the bottoms of the two ditch walls 9-1, and the water permeable window 10 is formed between two adjacent cross beams 9-2.
In actual use, in order to store atmospheric rainfall into the water storage structure in time, a drainage and seepage ditch section 9 is built on one side of the treatment strip 1. The drainage ditch adopts a rectangular section, a concrete structure and a bottom plate is not closed. The bottom of the drainage ditch is positioned above the bottom soil layer 4, the top of the drainage ditch is lower than the peripheral field surface, peripheral surface runoffs are collected into the drainage ditch, and the drainage ditch penetrates into the bottom aquifer 3 through the permeable window 10 of the drainage ditch section 9 and the pores of the bottom soil layer 4.
As shown in fig. 2 and 3, in this embodiment, after the treatment of a plurality of the treatment strips 1 is completed, the diaphragm wall sections 8 in the treatment strips 1 are connected together to form an annular diaphragm wall, and the drainage channel sections 9 are connected together to form a drainage channel, where the diaphragm wall, the bottom water-resisting layers 2 in all the treatment strips 1, and the top water-resisting layers 5 in all the treatment strips 1 form a water storage system with a box structure, and the drainage channel is communicated with the water storage system with the box structure.
In the second step, as shown in fig. 3 and fig. 4, when a treatment strip 1 at the most downstream in the mined-out subsidence area is treated, after the diaphragm wall section 8 of the bottom water-resisting layer 2 is constructed, a water storage bin 11 is arranged on the bottom water-resisting layer 2 in the treatment strip 1, a pipe well 12 through which a water pipe is penetrated is arranged at the top of the water storage bin 11, a plurality of water inlets are formed in the side wall of the water storage bin 11 along the circumferential direction of the water storage bin, a plurality of water filtering plates 15 are arranged at the water inlets, and a crushed stone filtering layer is arranged at the outer side of the water filtering plates 15; then continuing to treat the treatment strip 1 according to the steps 204 to 206;
the top of the water storage bin 11 is not higher than the top of the bottom soil layer 4, holes for installing the pipe wells 12 are formed in the top of the water storage bin 11, and the top of the pipe wells 12 extend upwards to the position above the surface soil layer 7.
During concrete implementation, through setting up water storage bin 11 in one side of bottom water barrier 2, can store the water in the formation to in the water storage bin 11, and then be convenient for when arid, through the water pump with the water pump that water storage bin 11 was interior stored to subaerial crops irrigate, construct the earth's surface into the high standard farmland that is fit for the district farming, promote the social benefit, ecological benefits and the economic benefits of administering the district.
It should be noted that, the water filtering plate 15 and the crushed stone filtering layer can both play a role in purifying water, so as to ensure the purity of the water resources stored in the water storage bin 11.
In this embodiment, after the treatment of the plurality of treatment strips 1 is completed, a low-pressure pipeline 13 is arranged on the surface soil layer 7 of the treated area; the water storage bin 11 is internally provided with a water pump for pumping water to the low-pressure pipeline 13, and the water delivery pipe is connected between the water pump and the low-pressure pipeline 13.
When in actual use, the hole formed in the top of the water storage bin 11 is a round hole with the diameter of 30cm, the pipe well 12 is a concrete pipe with the outer diameter of 30cm, the lower end of the pipe well 12 extends into the water storage bin 11, and the upper end of the pipe well 12 is exposed out of the ground surface.
In this embodiment, a hydrant 14 is disposed on the low pressure pipeline 13 at intervals of about 50m, a centrifugal pump is used to pump water, and a movable water hose is connected to the hydrant 14 for irrigation.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (9)
1. A method for treating a mining subsidence land of a shallow coal seam in a channel region is characterized by comprising the following steps:
step one, dividing treatment strips: dividing the mining subsidence area into a plurality of governance strips (1) from the downstream to the upstream of the channel region, wherein the width of each governance strip (1) is 30-50 m;
step two, mining subsidence land zonal treatment: the treatment of the plurality of treatment strips (1) is sequentially carried out according to the sequence from the downstream to the upstream, the treatment methods of the plurality of treatment strips (1) are the same, and when any treatment strip (1) is treated, the method comprises the following steps:
step 201, stripping soil in the treatment strip (1) until the soil is stripped and excavated to the position above the coal seam bottom plate (16);
202, arranging a bottom water-resisting layer (2) on a coal seam bottom plate (16) of a stripped treatment strip (1);
203, constructing a diaphragm wall section (8) on the bottom water-resisting layer (2), wherein the outer side of the diaphragm wall section (8) is flush with the outer side of the bottom water-resisting layer (2);
204, sequentially arranging a bottom aquifer (3) and a bottom soil layer (4) on the bottom waterproof layer (2) from bottom to top; the top of the bottom soil layer (4) is flush with the top of the impervious wall section (8), and the bottom water-bearing layer (3) and the bottom soil layer (4) are attached to the impervious wall section (8);
step 205, arranging a drainage ditch section (9) on one side of a bottom soil layer (4), wherein the top of the drainage ditch section (9) extends to the upper part of the ground surface of a channel region, the top of the drainage ditch section (9) is open, and a plurality of permeable windows (10) are arranged at the bottom of the drainage ditch section;
and 206, sequentially arranging a top water-resisting layer (5), a water storage type core soil layer (6) and a surface soil layer (7) from bottom to top in an area where the drainage ditch section (9) is not arranged at the tops of the bottom soil layer (4) and the impervious wall section (8), wherein the surface of the surface soil layer (7) is flush with the surface of the ditch area.
2. The method for treating the mining subsidence land of the shallow coal seam in the channel region according to claim 1, wherein the method comprises the following steps: the bottom water-resisting layer (2) is closely attached to the top of the coal seam bottom plate (16), and the bottom water-resisting layer (2) and the top water-resisting layer (5) are paved by adopting stone-separating loess; the bottom aquifer (3) is paved by adopting the rock soil of a system delay group in the dwarf system above the stripped coal seam of the treatment strip (1); the substrate layer (4) is paved by adopting weathered bedrock and rock fragments formed in the stripping and digging process of the treatment strip (1); the water storage type core soil layer (6) is paved by adopting sand soil of an upper update system salasu group; the surface soil layer (7) is paved by adopting a cultivated layer or cured soil peeled and dug by the treatment strip (1).
3. The method for treating the mining subsidence land of the shallow coal seam in the channel region according to claim 2, wherein the method comprises the following steps: when the surface soil layer (7) is paved, firstly spreading uniform urban sludge on the surface of a cultivation layer or cured soil peeled and dug by the treatment strip (1), then deep ploughing and raking are carried out by using a ploughing machine to uniformly fertilize, and then the surface soil layer (7) is paved by using the soil after the fertilization, wherein the volume weight of the paved surface soil layer (7) is not more than 1.4g/cm 3 。
4. The method for treating the mining subsidence land of the shallow coal seam in the channel region according to claim 2, wherein the method comprises the following steps: in the second step, when the bottom water-resisting layer (2), the bottom soil layer (4), the top water-resisting layer (5) and the surface soil layer (7) are arranged, a bulldozer is adopted for leveling and compacting.
5. The method for treating the mining subsidence land of the shallow coal seam in the channel region according to claim 1, wherein the method comprises the following steps: in step 201, when the soil body in the treatment strip (1) is peeled and excavated, the stratum is equally divided and peeled and excavated, and the peeled and excavated soil bodies in different strata are classified and stacked.
6. The method for treating the mining subsidence land of the shallow coal seam in the channel region according to claim 1, wherein the method comprises the following steps: the drainage ditch section (9) comprises two oppositely arranged ditch walls (9-1) and a plurality of cross beams (9-2) connected between the bottoms of the two ditch walls (9-1), and a water permeable window (10) is formed between two adjacent cross beams (9-2).
7. The method for treating the mining subsidence land of the shallow coal seam in the channel region according to claim 1, wherein the method comprises the following steps: after a plurality of the governing strips (1) are all governed, the impervious wall sections (8) in the governing strips (1) are connected together to form an annular impervious wall, a plurality of drainage ditch sections (9) are connected together to form a drainage ditch, and the impervious wall, the bottom water-resisting layers (2) in all the governing strips (1) and the top water-resisting layers (5) in all the governing strips (1) form a water storage system with a box structure, and the drainage ditch is communicated with the water storage system with the box structure.
8. The method for treating the mining subsidence land of the shallow coal seam in the channel region according to claim 1, wherein the method comprises the following steps: when a treatment strip (1) at the most downstream in the mining subsidence area is treated, after a diaphragm wall section (8) of a bottom water-resisting layer (2) is constructed, a water storage bin (11) is arranged on the bottom water-resisting layer (2) in the treatment strip (1), a pipe well (12) for a water pipe to pass through is arranged at the top of the water storage bin (11), a plurality of water inlets are formed in the side wall of the water storage bin (11) along the circumferential direction of the water storage bin, a plurality of water filtering plates (15) are arranged at the water inlets, and a crushed stone filtering layer is arranged on the outer side of each water filtering plate (15); then continuing to treat the treatment strip (1) according to the steps 204 to 206;
the top of the water storage bin (11) is not higher than the top of the bottom soil layer (4), holes for installing the pipe well (12) are formed in the top of the water storage bin (11), and the top of the pipe well (12) extends upwards to the position above the surface soil layer (7).
9. The method for treating the mining subsidence area of the shallow coal seam in the channel region according to claim 8, wherein the method comprises the following steps: when the treatment of the plurality of treatment strips (1) is finished, a low-pressure pipeline (13) is arranged on the surface soil layer (7) of the treated area; the water storage bin (11) is internally provided with a water pump for pumping water to the low-pressure pipeline (13), and the water pipe is connected between the water pump and the low-pressure pipeline (13).
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| CN202310418665.3A CN116335668A (en) | 2023-04-18 | 2023-04-18 | Method for treating mining subsidence land of shallow-buried coal seam in channel region |
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| CN202310418665.3A CN116335668A (en) | 2023-04-18 | 2023-04-18 | Method for treating mining subsidence land of shallow-buried coal seam in channel region |
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