CN105165164A - Coal mining subsidence area filling reclamation method based on coal gangue - Google Patents
Coal mining subsidence area filling reclamation method based on coal gangue Download PDFInfo
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- CN105165164A CN105165164A CN201510672216.7A CN201510672216A CN105165164A CN 105165164 A CN105165164 A CN 105165164A CN 201510672216 A CN201510672216 A CN 201510672216A CN 105165164 A CN105165164 A CN 105165164A
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Abstract
The invention discloses a coal mining subsidence area filling reclamation method based on coal gangue. According to the method, the coal gangue is taken as a filling substrate to fill a coal mining subsidence area, and then the filling substrate is covered with soil, wherein the coal gangue with the particle size smaller than 80 mm accounts for more than 40% of the filling substrate. The coal mining subsidence area filling reclamation method based on the coal gangue utilizes the coal gangue with different particle size ratios as the filling substrate, so that the filling substrate has better water and fertilizer retention capability and air permeability than the coal gangue in a natural state, especially the coal gangue containing 70%-95% of the coal gangue with the particle size smaller than 80 mm accounting for 70%-95% is taken as the filling substrate, accordingly, physio-ecological characteristics of crops cultivated by reconstructed soil are good, and the reconstructed soil obtained with the filling method is more favorable for growth of the crops.
Description
Technical field
What the present invention relates to is a kind of Sbusidence Damage district Reclamation by filling method, in particular a kind of sinking land in coalmining areas Reclamation by filling method based on gangue.
Background technology
China is Dissertation of Development of Coal Industry big country, and the large scale mining of coal resources and utilization cause land resources to run off in a large number.Utilizing Coal Solid Wastes such as gangue etc. to carry out the Reclamation by filling of the sinking land in coalmining areas in recent years, can alleviate the environmental problem that soil is piled up, covered to a large amount of Coal Solid Wastes, is the effective way recovering to plough in mining area.But prior art does not consider the impact of the gangue filling substrate of variable grain level on the soil cultivation character such as preservation capacity of water and fertility and gas permeability of the soil after reclaiming.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of sinking land in coalmining areas Reclamation by filling method based on gangue, to improve the cultivation character of the reconstruct of the sinking land in coalmining areas after Reclamation by filling soil.
The present invention is achieved by the following technical solutions:
A kind of sinking land in coalmining areas Reclamation by filling method based on gangue, the method, using gangue as filling substrate, is filled the sinking land in coalmining areas, then earthing on filling substrate, in described filling substrate, the gangue proportion that particle diameter is less than 80mm is more than 40%.
Further preferably, described particle diameter is less than the gangue proportion of 80mm is 70%-95%.
Further preferably, the thickness of described earthing is 30-70cm.
Further preferably, the thickness of described earthing is 50-60cm.
Further preferably, for the subsided water area of the sinking land in coalmining areas, described Reclamation by filling method comprises the following steps:
(1) subsided water area is filled with the gangue under unsorted nature;
(2) be that filling substrate continues to fill with the gangue that the gangue proportion that particle diameter is less than 80mm is more than 70%;
(3) earthing is consistent with ground level to fill area.
Further preferably, in described step (1), the height of filling is to 1.5m below earth's surface bottom subsided water area.
The present invention has the following advantages compared to existing technology: the invention provides a kind of sinking land in coalmining areas Reclamation by filling method based on gangue, the method utilizes the gangue of variable grain level proportioning as filling substrate, compared to the gangue under nature, there is better preservation capacity of water and fertility and gas permeability, especially gangue that the gangue proportion of 80mm is 70%-95% is less than as filling substrate using particle diameter, the each eco-physiological characteristics of crops of its reconstruct soil incubation all shows well, illustrate that reconstruct soil that placement method of the present invention obtains is more conducive to the growth of crops.
Accompanying drawing explanation
Fig. 1 is different times each experimental field soil moisture content monitoring result block diagram.
Embodiment
Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
1, test method
The present embodiment creates large " gangue Reclamation by filling Demonstration Base " for Experimental Area with Huainan, utilize the ways and means such as soil physico-chemical property and each some eco-physiological indexes situation of change of corn in Experimental Area, probe into variable grain level gangue reconstructs soil physico-chemical property and Maize Physiological ecosystem characterization thereof on Experimental Area impact as filling substrate.This Experimental Area is positioned at Pan Ji mining area, Huainan City, and the gross area is 2000m
2, wherein 300m
2as " under non-sorting gangue filling condition different thickness of earth covering " Reclamation by filling test region, equipartition is 10 × 10m
2experimental field and according to 70cm, 50cm and 30cm cover table soil thickness be labeled as I, II, No. III field successively; 900m
2as " under best thickness of earth covering condition variable grain grating gangue " Reclamation by filling test region, equipartition is 10 × 30m
2experimental field, cash is washed as filling substrate using the variable grain grating digging gangue or two taking from Huainan Zhu Jikuang and Pan Beikuang, and according to thick, in thick and fine grained grating be labeled as IV, V, No. VI field successively, above cover 50-60cm loess as optimum thickness overburden layer.All separate by water proof geotextiles between each experimental field and between experimental plot and extraneous field.In each experimental field, reconstruct soil structure and coal gangue particle grating details are in table 1:
Table 1 each experimental field reconstruct soil structure
The sinking land in coalmining areas Reclamation by filling method based on gangue of the Experimental Area of the present embodiment, comprises the following steps:
(1) region, experimental field is original position subsided water area, mean depth of water 3m, subterranean water level average out to-1.5m in Experimental Area.Triangulated height amount method is first utilized to demarcate the particular location of six pieces of experimental field before the work of Experimental Area, according to the volume of experimental field design area and subside depth calculation gangue and Sealing soil;
(2) utilize unsorted digging gangue to fill subsided water area, spoil packed height is to 1.5m below earth's surface bottom subsided water area;
(3) geotextiles is all adopted to carry out vertical separation, to prevent the lateral transfer of moisture, nutrient and the salinity of Experimental Area between Jian Jige experimental field, periphery farmland to Experimental Area and every block experimental field;
(4) layering filling is carried out according to the coal gangue particle grading distribution scheme (table 1) in different tests field, namely with bulldozer leveling after every filling 30cm height gangue, consistent to guarantee the ground elevation that every block experimental field is filled at every turn;
(5) carry out the earthing work of each experimental field according to the thickness of earth covering scheme in table 1, require that earth's surface, the experimental plot absolute altitude after earthing is consistent with surrounding farmland;
(6) after reclaiming, conveniently culture technique maize planting.
2, sample collection
Reclaim and carry out the collection of soil specimen after leaving standstill a period of time after test region is filled, the collecting soil sample time of the present embodiment is in June, 2014, fine during sampling, proper temperature.Utilize GPS to locate, lay sampled point in each experimental plot according to " quincuncial pile method " and carry out stratified sampling, according to sampler punching sampling result, by each experimental field soil layering.Utilize φ 50.24mm × 50mm cutting ring first to gather each experimental field H1 layer (0-10cm top layer) soil specimen, lay 8 sampled points in I, II, No. III experimental field, each sampled point gathers 2 samples, amounts to 48 samples; IV, each laying 3 sampled points in V, No. VI experimental field, each sampled point gathers 2 samples, amounts to 18 samples; In each experimental field, take section again and gather each experimental field H2 layer (below 10cm topsoil) soil specimen with same size cutting ring, amounting to 66 samples; Meanwhile, adopt in normal farmland same hierarchical level and the method for sampling to gather soil specimen totally 18, be control group NS, amount to 150 soil specimens.
3, gangue Reclamation by filling ground soil physico-chemical property and Maize Physiological ecological characteristic result of the test and analysis
A, soil moisture content monitoring result and analysis
From year July in June, 2014 to 2014, soil moisture content monitoring is carried out to I-No. VI experimental field, result as shown in Figure 1, Fig. 1 can find out, in I-No. III experimental field, monitoring the initial stage and mid-term except No. I experimental field, all the other each experimental plot H1 layer soil moisture contents are all higher than H2 layer soil moisture content; Except No. III experimental field H1 floor soil, each soil horizon water content in all the other each experimental field passing all in time and increasing, soil moisture content reduces with the reduction of thickness of earth covering.From above-mentioned result of the test, at natural spoil (non-sorting) as under filling substrate condition, soil moisture content increases with the increase of thickness of earth covering; When thickness of earth covering is less than 30cm, partially thin at overburden layer, under the impact of the composite factors such as gangue matrix water retention property difference, soil horizon moisture more easily evaporates and seepage, and soil moisture content is reduced.
In IV-No. VI experimental field, No. V each soil horizon water content in experimental field all has peak at monitoring initial stage and latter stage, and No. IV experimental field average soil moisture is minimum, and No. VI experimental field average soil moisture is taken second place.Under 50-60cm thickness of earth covering condition, effectively soil moisture can be kept as filling substrate within the scope of certain hour using middle coarse granule grating gangue, and fine grained grating gangue is as filling substrate, its reconstruct soil compaction is higher, soil pore space is less, capillary physically well develops, and contributes to soil water evaporation, is unfavorable for the maintenance of soil moisture.
No. V experimental field and No. II experimental field are carried out across comparison known, under 50-60cm thickness of earth covering condition, different-grain diameter gangue (sorting) Reclamation by filling experimental plot soil moisture content is higher than natural spoil (non-sorting) Reclamation by filling experimental plot, illustrate and carry out filling again after gangue is carried out simple and easy sorting, its reconstruct soil has good moisture holding capacity.
The testing result of B, test region reconstruct soil physico-chemical property of reclaiming and analysis
Utilize the available nitrogen average content in indophenol blue colorimetry mensuration soil, sodium bicarbonate lixiviate-molybdenum antimony resistance colorimetric method measures the rapid available phosphorus average content in soil, available potassium average content in ammonium acetate lixiviate-flame spectrophotometric determination soil, the background value of available nitrogen, rapid available phosphorus and available potassium is with reference to " Soil In Anhui Province environmental background value survey report ", and result is as shown in table 2 below:
Table 2: soil physico-chemical property testing result
Known in table 2, in I-No. III experimental field, thickness of earth covering is that the H1 floor Soil Available nitrogen of 50cm (No. II experimental field), phosphorus, potassium content are the highest; The quick-acting the content of nitrogen and phosphorous of H2 layer reduces along with the minimizing of thickness of earth covering, and H2 layer quick-acting potassium content increases along with the minimizing of thickness of earth covering.In IV-No. VI experimental field, H1 layer Soil Available nitrogen, potassium content increase along with the increase of particle diameter <80mm gangue proportion, and H1 layer soil quick-effective phosphor is the highest in middle coarse granule grating; H2 layer Soil Available nitrogen, phosphorus, potassium content all increase along with the increase of particle diameter <80mm gangue proportion.Reach a conclusion, natural gangue (non-sorting) for thickness of earth covering under filling substrate condition be the region of reclaiming of 50cm, and thickness of earth covering be under 50-60cm condition in coarse granule grating gangue can keep preferably reconstructing nitrogen, phosphorus, the potassium element in soil as the region of reclaiming of filling substrate.
C, reclaim test region Maize Physiological ecological characteristic monitoring result and analysis
From corn budding time to the corn ripe and harvested phase, 10 strain corns are respectively randomly drawed in I, II, No. III experimental field, 5 strain corns are respectively randomly drawed as collecting sample plant in IV, V, No. VI experimental field, choose the average plant height of corn ripe and harvested phase, corn budding time, result be as shown in table 3 below to the average chlorophyll concentration of corn ripe and harvested phase blade (TYS-A type Chlorophyll meter mensuration), corn yield as Maize Physiological ecosystem characterization analysis indexes:
Table 3: Maize Physiological ecological characteristic monitoring result
Can find out in table 3, average plant height aspect, the average plant height of corn of IV, V, No. VI experimental field is higher than I, II, No. III experimental field, and No. V experimental field corn plant height is the highest in 6 pieces of experimental field; Chlorophyll content aspect, I and No. II other 5 pieces of experimental field of experimental field chlorophyll from maize leaf concentration ratio is low, IV, V and No. VI experimental field chlorophyll from maize leaf concentration and normal farmland corn leaf chlorophyll concentration are without significant difference, but mean value is higher than I, II and No. III experimental field chlorophyll from maize leaf mean value, and No. V experimental field maize leaf chlorophyll content is the highest in IV-No. VI experimental field; Output aspect, V, No. VI experimental field corn yield is higher, is slightly less than normal farmland corn output, and II, No. IV experimental field corn yield takes second place, and No. III experimental field corn yield is minimum in 6 experimental field.Reach a conclusion, 50cm thickness of earth covering is best thickness of earth covering, and under thickness of earth covering is 50-60cm condition, the gangue of selection grain composition thick grade in being carries out Reclamation by filling as filling substrate, can obtain the corn of higher quality.
4, gangue Reclamation by filling ground soil quality assessment
Using the detected value of the indexs such as soil moisture content, available nitrogen, rapid available phosphorus, available potassium as judging quota, comprehensive effectively evaluating is carried out to the soil quality of variable grain grating gangue Reclamation by filling experimental field under natural gangue Reclamation by filling experimental field under different thickness of earth covering condition and the thick native condition of best earthing.Utilizing Field Using Fuzzy Comprehensive Assessment and each Indexs measure value to calculate can the comprehensive index value Q of reflect soil quality, and computing formula is as follows:
Q＝ΣW
i×N
i
In formula: Q is soil quality comprehensive index value; Wi is the weight of indices; Ni be indices be subordinate to angle value.By detecting, the mean value of each index in variable grain grating experimental field can be obtained.
Reach a conclusion, thickness of earth covering is under 50-60cm condition, and the gangue of grain composition thick grade in being carries out Reclamation by filling as filling substrate, and its soil quality composite index is the highest.
Claims (6)
1., based on a sinking land in coalmining areas Reclamation by filling method for gangue, the method, using gangue as filling substrate, is filled the sinking land in coalmining areas, then earthing on filling substrate, it is characterized in that, in described filling substrate, the gangue proportion that particle diameter is less than 80mm is more than 40%.
2. a kind of sinking land in coalmining areas Reclamation by filling method based on gangue according to claim 1, it is characterized in that, the gangue proportion that described particle diameter is less than 80mm is 70%-95%.
3. a kind of sinking land in coalmining areas Reclamation by filling method based on gangue according to claim 1, it is characterized in that, the thickness of described earthing is 30-70cm.
4. a kind of sinking land in coalmining areas Reclamation by filling method based on gangue according to claim 3, it is characterized in that, the thickness of described earthing is 50-60cm.
5., according to the arbitrary a kind of described sinking land in coalmining areas Reclamation by filling method based on gangue of claim 1-4, it is characterized in that, for the subsided water area of the sinking land in coalmining areas, described Reclamation by filling method comprises the following steps:
(1) subsided water area is filled with the gangue under unsorted nature;
(2) be that filling substrate continues to fill with the gangue that the gangue proportion that particle diameter is less than 80mm is more than 40%;
(3) earthing is consistent with ground level to fill area.
6. a kind of sinking land in coalmining areas Reclamation by filling method based on gangue according to claim 5, is characterized in that, in described step (1), the height of filling is to 1.5m below earth's surface bottom subsided water area.
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| CN114145158A (en) * | 2021-11-30 | 2022-03-08 | 青海九零六工程勘察设计院有限责任公司 | Land reclamation structure of coal mine carbon residue land in high and cold regions and implementation method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107489448A (en) * | 2017-08-30 | 2017-12-19 | 曲阜师范大学 | A kind of subsided land from coal mine Reclamation by filling method based on geotextiles |
| CN107905838A (en) * | 2017-10-30 | 2018-04-13 | 安徽师范大学 | A kind of subsided land from coal mine gangue Reclamation by filling method based on mud mixing |
| CN109804833A (en) * | 2019-03-12 | 2019-05-28 | 安徽理工大学 | A method of vegetation root system damages during reducing minery surface subsidence |
| CN112272988A (en) * | 2020-10-30 | 2021-01-29 | 陕西煤业化工技术研究院有限责任公司 | Method for modifying soil in subsidence area |
| CN112517204A (en) * | 2020-11-12 | 2021-03-19 | 安徽大学 | High-diving-level area soil reclamation device and reclamation method thereof |
| CN114145158A (en) * | 2021-11-30 | 2022-03-08 | 青海九零六工程勘察设计院有限责任公司 | Land reclamation structure of coal mine carbon residue land in high and cold regions and implementation method |
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Application publication date: 20151223 |