CN105248007A - Alternate, multilayer and repetitive filling soil reconstruction method by using Yellow River sediment in reclamation of coal mining subsidence land - Google Patents
Alternate, multilayer and repetitive filling soil reconstruction method by using Yellow River sediment in reclamation of coal mining subsidence land Download PDFInfo
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Abstract
The invention relates to an alternate, multilayer and repetitive filling soil reconstruction method by using Yellow River sediment in reclamation of a coal mining subsidence land, and belongs to the technical field of mine environment protection. The method comprises the steps of determining soil stripping thickness of a coal mining subsidence land and dividing the coal mining subsidence land into regular rectangular filling strips; determining soil filling reconstruction profile characteristics and further determining the sequence of the filling strips and the number of synchronous and alternate filling strips; performing layer-by-layer soil stripping on a group of synchronous and alternate filling strips by using an adjacent filling strip which does not belong to the group as a stripped soil stacking area for the synchronous and alternate filling strips, and stacking the stripped soil in corresponding subareas; performing alternate, multilayer and repetitive filling of sediment layers, drainage and covering of subsoil layers, and after reconstruction of all sediment layers and subsoil layers of all filling strips in the group of synchronous and alternate filling strips are completed, backfilling surface soil for coverage and flattening the soil. The method improves the water and fertility preservation performance of the reconstructed profile, accelerates the soil ripening of the sediment layers and facilitates the growth and development of crops.
Description
Technical field
The invention belongs to technical field of mine environment protection, particularly mining area, high ground-water level Plain Yellow River mud is reclaimed coal mine subsidence land alternate multiple repeated filling soil reconstruction method.
Technical background
In mining area, high ground-water level Plain, Eastern China, after coal-mining subsidence, ponding is serious, and the excess surface water area in some area reaches more than 50% of depression area, and ponding is more than 20m (Xiao Wu, exploiting field Ground Surface Dynamic depression simulation and arable land rate analysis of reclaiming, 2013).This type of regional land reclamation problem is the research emphasis of Chinese scholar in many ways always, Meaning of Land Reclamation in China is since the starting eighties in 20th century, develop very rapid, propose the Reclamation Technique digging many practicalities such as dark pad is shallow, gangue filling, flyash filling for this type of area, but the contradiction had a large population and a few land in such area is not well solved.Wherein, dig the shallow Reclamation Technique of dark pad, the arable area of recovery is less; Gangue or flyash Reclamation by filling need a large amount of fillers, may cause secondary pollution after filling, and along with recyclings such as mining area gangue and flyash, can not provide enough fillers.Some trials have been carried out for the depression of lake mud filling coal mining in recent years in China Partial mining area, achieve some achievements, but its scope of application is limited, be only limitted to the mining area of lake mud resource, and the soil bottom sludge thickness after using this technology to reclaim, easy formation marsh, the discharging consolidation time is also long, within after Reclamation by filling 1 year, just can cultivate.The Chinese research for Lower Reaches of The Yellow River silt arrester has had the history of more than 50 year, and domestic scholars has carried out correlative study for aspects such as irrigation areas sand basin silt roof strata moving pattern, silt farmland treatment technologies.Utilize part coal mine subsidence land near the advantage of the Yellow River, a kind of effective method with utilizing the depression of Yellow River mud filling coal mining, it can not only recover to plough to greatest extent, alleviate the contradiction had a large population and a few land in mining area, high ground-water level Plain, Eastern China, yellow river water resources and sediment resource can also be effectively utilized, be conducive to reducing the Yellow River bed elevation, improve Benefit of Flood Preventation.
Yellow River mud filling coal mining depression ground is to recover to plough as final purpose, its core content is Soil Reconstruction, and the key content of Soil Reconstruction is Soil Profile Reconstruction (Hu Zhenqi, the concept of mine reclamation Soil Reconstruction and method, 2005), it runs moisture and other Fertility evolution have impact, is the main standard checking success or failure of reclaiming, therefore reconstructs excellent soil profile most important.The key issue of Soil Profile Reconstruction is that soil and silt survey distribution level, and it is directly to refill technique relevant.China's part mining area has been carried out some to Yellow River mud Reclamation by filling coal mine subsidence land and has been attempted, but direct filling earthing defines typically " under above gluing sand " type profile, the sandy soils of filling is easy to leak Lou fertile, later stage is to crop water and nutrient supply deficiency, cause crop development bad, output is poor; And subregion, due to mulching soil deficiency, is caused in later stage cultivating procedure and Yellow River mud is moved, mix with original soil, exacerbate the not preservation capacity of water and fertility in this region.
For Yellow River mud Reclamation by filling coal mine subsidence land second ploughing method, patent (CN103283335B) that the applicant proposed the filling second ploughing method of coal mine subsidence land " Yellow River mud reclaim ", but it is only applicable to fully long band, to ensure that Yellow River mud has enough paths and precipitates, and be not suitable for the short strips of meticulous filling.The filling second ploughing method of coal mine subsidence land " Yellow River mud reclaim " " patent (CN103283335B) adopts continuous filling method; Yellow River mud primary filling completes; formation be " upper sticky lower sand " type profile, and be unfavorable for crop cultivation and form high yield good farmland.Geotextiles is adopted to stop measure after the filling second ploughing method of coal mine subsidence land " Yellow River mud reclaim " patent (CN103283335B) draining, draining is continued in continuous stowing operation, serve the object that certain obstruct Yellow River mud drains clear water, but still have the Clay and silt carried in part Yellow River mud to be discharged.
All in all, existing technology of closely drawing Yellow River mud Reclamation by filling coal mine subsidence land also has the following disadvantages: (1) is only applicable to fully long filling band, when filling band is shorter, Yellow River mud does not have sufficiently long precipitation pathways, cause Yellow River mud in draining to increase, add the burden of the sand measures such as drainage outlet geotextiles; (2) existing Yellow River mud direct filling earthing technique, define typical " upper sticky lower sand " type profile, preservation capacity of water and fertility is poor, is unfavorable for plant growth; (3) existing Yellow River mud direct filling earthing technique, adopts in continuous stowing operation and continues drainage pattern, lost the part Clay and silt carried in Yellow River mud; (4) existing Yellow River mud direct filling earthing technique, causes Yellow River mud filling bed blocked up, discharging consolidation overlong time, and the moisture of Yellow River mud filling bed mid-deep strata delays to drain, and extends Secondary Reclamation Time.
Summary of the invention
The object of the invention is for solving an above-mentioned difficult problem, proposing a kind of Yellow River mud and to reclaim coal mine subsidence land alternate multiple repeated filling soil reconstruction method, by alternately filling process, construct the soil profile of more scientific sandwich construction.
The Yellow River mud that the present invention proposes is reclaimed the filling second ploughing method of coal mine subsidence land, it is characterized in that:
(1) determine regional soil cover thickness to be filled, divide filling band: according to the depression degree of depth of coal mine subsidence land and the absolute altitude to be reclaimed of design, determine thickness of soil to be filled: according to thickness of soil to be filled and the maximum soil stripping thickness of coal mine subsidence land, determine the soil stripping thickness of coal mine subsidence land, the soil stripping thickness of coal mine subsidence land is 0.5 ~ 1m, wherein topsoil stripping thickness is 0.2 ~ 0.5m, and cubsoil cover thickness is 0 ~ 0.8m; According to depression ground cultivate, the actual geomorphic feature of irrigation and drainage, and the soil stripping thickness of soil stripping mechanical condition and coal mine subsidence land, coal mine subsidence land is divided into the rectangle filling band of rule, filling stripe size is wide 25-35m, long 50 ~ 150m, and by band by 1,2,3,4 ..., n is numbered;
(2) filling Soil Reconstruction section, silt filling number of times and thickness is determined: according to thickness of soil to be filled, soil stripping thickness and the soil structure of suitable sandwich soil of reclaiming determined by pot experiment, determine that filling Soil Reconstruction profile features is from top to bottom: silt layer-subsoil-silt layer ... subsoil-topsoil; Types of layers thickness is: the thick 0.2 ~ 0.5m of topsoil, each subsoil thickness 0.15 ~ 0.4m, each silt layer thickness 0.2 ~ 1m, and silt layer k is 2 ~ 4 layers, and wherein the number of plies of filling silt layer is k;
(3) determine that order and the timed delivery of filling band replace the number of filling band: adopt the mode every band filling, the filling band of first filling odd-numbered, refills the filling band of even-numbered, or on the contrary; Select k+1 filling band as one group of timed delivery for filling band;
(4) soil stripping laydown area is determined: one group of timed delivery replaced non-of the vicinity group filling band of filling band to replace the soil stripping laydown area of filling band as this group timed delivery, laydown area puts subarea by middle part table mound, and both sides cubsoil is stacked subarea and formed; It is 1 ~ 2.5m that table mound puts subarea height, and it is that 2 ~ 4m forms cubsoil dam that cubsoil stacks subarea height; Before the cubsoil of non-of vicinity group filling band stacks subarea stacking cubsoil, the native table mound being deposited in this filling band of also peeling off in the lump of table that cubsoil stacks subarea is put in subarea; If one group of timed delivery is Reclamation by filling band for non-of the vicinity group filling band of filling band, its band both sides are in table earthen backfill work progress, vacate the region not covering table soil and stack subarea as this group timed delivery for the cubsoil of filling band, in the middle of its band, the region of covering table soil puts subarea as this group timed delivery for the table mound of filling band;
(5) timed delivery is peeled off for the soil layering of filling band: carry out for filling band the delamination showing soil, cubsoil to each group timed delivery: first, by this group timed delivery for filling band topsoil stripping, cover thickness is 0.2 ~ 0.5m, and the table mound of stripping is placed on contiguous non-group # add 1 or subtract 1 filling band in the middle of table mound put on subarea, and the table soil non-for this vicinity group filling band cubsoil being stacked subarea is also peeled off in the lump and is deposited in its table mound and puts on subarea, soil conservation measure is taked to cover and the grass of plantation loam; Then timed delivery is peeled off for the cubsoil of filling band the cubsoil stacking subarea being deposited in contiguous non-group filling band, form cubsoil dam, cover for follow-up backfill;
(6) alternate multiple filling silt layer-draining-covering subsoil is successively carried out to often organizing timed delivery for filling band: for filling band, alternately filling is carried out to each group timed delivery, first filling silt layer from first timed delivery replaces filling band, when after the silt layer thickness 0.2 ~ 1m reaching setting, start filling second timed delivery for filling band, when after the silt layer thickness 0.2 ~ 1m reaching setting, carry out next timed delivery again for filling band, so carry out, be performed until kth+1 timed delivery for filling band; Each timed delivery, for after the complete layer of mud sand bed of filling strip filling, keeps the sediment deposition time of 1 ~ 3 day, then adopts dark drain ditch to add the mode draining of geotextiles; After the silt layer draining drying of filling, stack subarea from the cubsoil of contiguous non-group filling band and fetch earth, cover cubsoil by the subsoil thickness of design, subsoil thickness is 0.15 ~ 0.4m; After each timed delivery completes for filling strip filling covering subsoil, then carry out the filling of lower one deck silt layer by same way, until this group timed delivery replaces each filling bar tape alternation filling of filling band to complete;
(7) backfill of table soil: after completing the structure of all silt layers and subsoil, puts subarea from the table mound of contiguous non-group filling band, transports table soil back and carries out backfill covering and smooth; After the whole filling band of coal mine subsidence land completes filling, smooth in the lump.
Advantage of the present invention and good effect
(1) the multi-level section being beneficial to plant growth can be formed: alternate multiple repeated filling soil reconstruction method, the filling Soil Reconstruction section formed is no longer " upper sticky lower sand " type profile, the existence of multiple soil layer is had in section, improve the preservation capacity of water and fertility of reconstruct section, accelerate the soil-ripening of silt layer, be conducive to growing of crop.
(2) be conducive to precipitating and preserving the fine grained (Clay and silt) being rich in nutrition in Yellow River mud: alternate multiple repeated filling soil reconstruction method, by multiple tape alternation fillings, achieve when not affecting pack effectiveness, extend the time of Yellow River mud precipitation, be conducive to precipitating and preserving the fine grained (Clay and silt) being rich in nutrition in part Yellow River mud.
(3) Secondary Reclamation Time can be shortened further: by one group of timed delivery for the alternate multiple repeated filling soil reconstruction method between different filling band in filling band, within the time of the Yellow River mud layer discharging consolidation of filling, filling and earthing work can be carried out to group timed delivery for other bands in filling band, thus shorten whole reclaiming the duration.
(4) be conducive to the meticulous filling of short strips: when filling band is shorter, carry out meticulous filling operation, the draining of Yellow River mud layering and precipitating, can alleviate the burden of the sand measures such as drainage outlet geotextiles.
Accompanying drawing explanation
Fig. 1 the inventive method FB(flow block).
The embodiment of Fig. 2 application the inventive method divides filling band schematic diagram.
The filling Soil Reconstruction generalized section of the embodiment of Fig. 3 application the inventive method.
Fig. 4 is that the timed delivery of the present embodiment replaces the soil layering of filling band to peel off and contiguous non-group filling band table soil, cubsoil stacking subarea schematic diagram.
Fig. 5 is the table earthen backfill schematic diagram of the present embodiment filling band.
Embodiment
The Yellow River mud that the present invention proposes is reclaimed coal mine subsidence land alternate multiple repeated filling soil reconstruction method, by reference to the accompanying drawings and embodiment be described in detail as follows, the embodiment flow process of this method application as shown in Figure 1, comprises the following steps:
(1) determine regional soil cover thickness to be filled, divide filling band: according to the depression degree of depth of coal mine subsidence land and the absolute altitude to be reclaimed of design, determine thickness of soil to be filled: according to thickness of soil to be filled and the maximum soil stripping thickness of coal mine subsidence land, determine the soil stripping thickness of coal mine subsidence land, the soil stripping thickness of coal mine subsidence land is generally 0.5 ~ 1m, wherein topsoil stripping thickness is 0.2 ~ 0.5m, and cubsoil cover thickness is 0 ~ 0.8m; In the present embodiment, the depression degree of depth of coal mine subsidence land is 0.9m, and the absolute altitude to be reclaimed of design is the former absolute altitude before depression, and soil stripping thickness is 0.6m, and wherein topsoil stripping thickness is 0.3m, and cubsoil cover thickness is 0.3m.According to the cultivating of depression ground, the actual geomorphic feature such as irrigation and drainage, and the soil stripping thickness of soil stripping mechanical condition and coal mine subsidence land, coal mine subsidence land is divided into the rectangle filling band of rule, general filling stripe size is wide 25-35m, long 50 ~ 150m, and by band by 1,2,3,4 ..., n is numbered; In the present embodiment, filling stripe size is wide is 30m, and long is 100m; As shown in Figure 2, the filling band 11 marked off is numbered 1,2 ..., N, build drain ditch 12,14 and field road 15 at filling strip perimeter, drain ditch 12,14 through, bridge 13 is built by drain ditch 12,14 and field road 15 intersection.
(2) filling Soil Reconstruction section, silt filling number of times and thickness is determined: (for a change the soil structure of " upper soil lower husky "), according to thickness of soil to be filled, soil stripping thickness and the soil structure of suitable sandwich soil of reclaiming determined by pot experiment, determines that filling Soil Reconstruction profile features is from top to bottom: silt layer-subsoil-silt layer ... subsoil-topsoil; Wherein types of layers thickness is: the thick 0.2 ~ 0.5m of topsoil, each subsoil thickness 0.15 ~ 0.4m, each silt layer thickness 0.2 ~ 1m, and silt layer k is 2 ~ 4 layers; In the present embodiment, k=2, as shown in Figure 3, its filling Soil Reconstruction profile features is from top to bottom: silt layer 25-subsoil 24-silt layer 23-subsoil 22-topsoil 21, topsoil 21 thickness is 0.3m, and subsoil 22,24 thickness is 0.15m, and silt layer 24 thickness is 0.3m, silt layer 25 thickness is 0.6m, and in the present embodiment, silt adopts Yellow River mud;
(3) determine that order and the timed delivery of filling band replace the number of filling band: adopt the mode every band filling, the filling band of first filling odd-numbered, refills the filling band of even-numbered, or on the contrary; Select k+1 (odd number or even number) filling band as one group of timed delivery for filling band; In the present embodiment, the band of first filling odd-numbered, as shown in Figure 4, k=2, then get 3 filling bands as one group of timed delivery for filling band, namely the filling band being numbered 1,3,5 replaces filling band as first group of timed delivery, is numbered the filling band of 2,4,6 as non-of first group of vicinity group filling band;
(4) soil stripping laydown area is determined: one group of timed delivery replaced non-of the vicinity group filling band of filling band to replace the soil stripping laydown area of filling band as this group timed delivery, laydown area puts subarea by middle part table mound, and both sides cubsoil is stacked subarea and formed; It is 1 ~ 2.5m that table mound puts subarea height, and it is 2 ~ 4m that cubsoil stacks subarea height, namely forms cubsoil dam; Before the cubsoil of non-of vicinity group filling band stacks subarea stacking cubsoil, the native table mound being deposited in this filling band of also peeling off in the lump of table that cubsoil stacks subarea is put in subarea; If one group of timed delivery is Reclamation by filling band for non-of the vicinity group filling band of filling band, its band both sides are in table earthen backfill work progress, vacate the region not covering table soil and stack subarea as this group timed delivery for the cubsoil of filling band, in the middle of its band, the region of covering table soil puts subarea as this group timed delivery for the table mound of filling band.In the present embodiment, first group of vicinity non-group filling band (2,4,6) is the band of non-Reclamation by filling, as shown in Figure 4, it is as the soil stripping laydown area of first group of timed delivery for filling band (1,3,5), comprise table mound and put subarea 36, both sides cubsoil stacks subarea 37, and cubsoil is stacked the table soil in subarea 37 and peeled off in the lump and be deposited in this filling band table mound and put subarea 36, it is 1m that table mound puts subarea height, and the height that cubsoil stacks subarea is 2m;
In non-of vicinity group filling band (2,4,6) of the present embodiment, table mound is put subarea 36 and both sides cubsoil to stack the width determination concrete grammar in subarea 37 as follows:
(41) set the width of each filling band as W, length is L, and wherein table mound puts subarea width is W
1, it is W that both sides cubsoil stacks subarea width
2, soil stripping thickness is d, and wherein topsoil stripping thickness is a, and table mound is put subarea and cubsoil and stacked cross section, subarea and be one trapezoidal, and its natural angle of slope (angle of repose) gets 45 °, and it is h that table mound puts subarea height
1, it is h that cubsoil stacks subarea height
2;
(42) timed delivery replaces the table soil on the table soil of filling band (1,3,5) and contiguous non-group filling band (2,4,6) both sides cubsoil stacking subarea, be deposited in the lump and show mound in the middle part of contiguous non-group filling band and put subarea, therefore its table mound puts the width W in subarea
1=(W+2W
2) * a/h
1+ h
1;
(43) timed delivery is deposited in contiguous non-group filling band (2,4,6) both sides cubsoil stacking subarea for the cubsoil of filling band (1,3,5), form cubsoil dam, therefore cubsoil stacks the width W in subarea
2=W (d-a)/(2h
2)+h
2;
(44) filling band width W, table mound put subarea W
1subarea W is stacked with cubsoil
2pass is W>=W
1+ 2W
2.
(45) in the present embodiment, W=30m, L=100m, d=0.6m, a=0.3m, h
1=1, h
2=2m, then W
1=12.55m, W
2=4.25m.
(5) timed delivery is peeled off for the soil layering of filling band: carry out table soil to each group timed delivery for filling band, the delamination of cubsoil, for filling silt is ready: first, by this group timed delivery for filling band topsoil stripping, cover thickness is 0.2 ~ 0.5m, and the table mound of stripping is placed on contiguous non-group filling band (namely this band numbering add 1 or subtract 1 filling band) the table mound of centre puts on subarea, and the table soil non-for this vicinity group filling band cubsoil being stacked subarea is also peeled off in the lump and is deposited in its table mound and puts on subarea, then take soil conservation measure to cover and plant the grass of loam, then timed delivery is peeled off for the cubsoil of filling band the cubsoil stacking subarea being deposited in contiguous non-group filling band, form cubsoil dam, cover for follow-up backfill, as shown in Figure 4, realize optimum soil reclaimation,
(6) alternate multiple filling silt layer-draining-covering subsoil is successively carried out to often organizing timed delivery for filling band: for filling band, alternately filling is carried out to each group timed delivery, first filling silt layer from first timed delivery replaces filling band, when after the silt layer thickness (0.2 ~ 1m) reaching setting, start filling second timed delivery for filling band, when after the silt layer thickness (0.2 ~ 1m) reaching setting, carry out next timed delivery again for filling band, so carry out, be performed until kth+1 timed delivery for filling band.As shown in Fig. 4 31, each stowing operation all carries out filling from filling band 32 one end to direction, drain ditch 14.Each timed delivery, for after the complete layer of mud sand bed of filling strip filling, keeps the sediment deposition time of 1 ~ 3 day, to ensure Clay and silt precipitation in silt.Then, adopt dark drain ditch to add the mode draining of geotextiles, shown in Fig. 4, the sand barriers 34 such as two discharge outlet 33 and geotextiles are set, to discharge the water in silt layer as early as possible.After the silt layer draining drying of filling, stack subarea 35 from the cubsoil of contiguous non-group filling band and fetch earth, cover cubsoil by the subsoil thickness of design, subsoil thickness is 0.15 ~ 0.4m; Each timed delivery covers the filling carrying out lower one deck silt layer after subsoil completes again by same way for filling strip filling, until this group timed delivery is for the filling Soil Reconstruction section of each filling band complete design of filling band, as shown in Figure 3.For each filling band in filling band, alternate multiple repeated filling silt layer-draining-covering subsoil is carried out to each group timed delivery, linking must be carried out, ensure that filling is timely, draining rapid, earthing puts in place, the measure preventing from washing away aspect of having reclaimed to be taked during filling simultaneously, guarantee the filling Soil Reconstruction profile features structure by design;
It is as follows that the present embodiment carries out alternate multiple repeated filling silt floor-draining-covering subsoil specific implementation method to first group of 1,3, No. 5 timed delivery for filling band:
(61) filling No. 1 timed delivery is for 25 silt floor of filling band, when after the silt layer thickness 0.6m reaching setting, keeps the sediment deposition time of 1 ~ 3 day, to ensure Clay and silt precipitation in silt.Treat in its drainage procedure, filling No. 3 timed delivery, for 25 silt floor of filling band, when after the silt layer thickness 0.6m reaching setting, treat that in its drainage procedure, filling No. 5 timed delivery are for 25 silt floor of filling band;
(62) Real-Time Monitoring 1,3, No. 5 timed delivery are for 25 silt floor of filling band filling, after its abundant draining drying, carry out smooth to 24 silt layers immediately, then stack subarea from 35 cubsoils of contiguous non-group filling band to fetch earth, 25 silt layers cover 0.15m thickness 24 subsoil, and carries out smooth;
(63) after the measure preventing from washing away being taked for filling band to the timed delivery having completed 24 subsoils coverings in (62), carry out the filling operation of 23 silt layers, then the sediment deposition time of 1 ~ 3 day is kept, to ensure Clay and silt precipitation in silt.Treat in its drainage procedure, other timed delivery in this group of 25 silt layers fully draining drying are carried out to the work of covering 24 subsoil and filling 23 silt layer for filling band;
(64) Real-Time Monitoring 1,3, No. 5 timed delivery are for 23 silt floor of filling band filling, after its abundant draining drying, carry out smooth to 23 silt layers immediately, then stack subarea from 35 cubsoils of contiguous non-group filling band to fetch earth, 23 silt layers cover 0.15m thickness 22 subsoil, and carries out smooth;
(65) (61) ~ (64) step is repeated, until this group 1,3, No. 5 timed delivery all complete 22 subsoils for filling band cover finishing operations;
(7) backfill of table soil: to one group of timed delivery for each filling band in filling band according to step (6) alternate multiple repeated filling silt layer-draining-covering subsoil, after completing the structure of all silt layers and subsoil, subarea is put from the table mound of contiguous non-group filling band, transport back table soil carry out backfill covering and smooth, as shown in Figure 5; After the whole filling band of coal mine subsidence land completes filling, unnecessary table earthen backfill is covered the region lacking table soil, smooth in the lump.
Claims (2)
1. Yellow River mud is reclaimed a coal mine subsidence land alternate multiple repeated filling soil reconstruction method, it is characterized in that: the method comprises the following steps:
(1) determine regional soil cover thickness to be filled, divide filling band: according to the depression degree of depth of coal mine subsidence land and the absolute altitude to be reclaimed of design, determine thickness of soil to be filled: according to thickness of soil to be filled and the maximum soil stripping thickness of coal mine subsidence land, determine the soil stripping thickness of coal mine subsidence land, the soil stripping thickness of coal mine subsidence land is 0.5 ~ 1m, wherein topsoil stripping thickness is 0.2 ~ 0.5m, and cubsoil cover thickness is 0 ~ 0.8m; According to depression ground cultivate, the actual geomorphic feature of irrigation and drainage, and the soil stripping thickness of soil stripping mechanical condition and coal mine subsidence land, coal mine subsidence land is divided into the rectangle filling band of rule, filling stripe size is wide 25-35m, long 50 ~ 150m, and by band by 1,2,3,4 ..., n is numbered;
(2) filling Soil Reconstruction section, silt filling number of times and thickness is determined: according to thickness of soil to be filled, soil stripping thickness and the soil structure of suitable sandwich soil of reclaiming determined by pot experiment, determine that filling Soil Reconstruction profile features is from top to bottom: silt layer-subsoil-silt layer ... subsoil-topsoil; Types of layers thickness is: the thick 0.2 ~ 0.5m of topsoil, each subsoil thickness 0.15 ~ 0.4m, each silt layer thickness 0.2 ~ 1m, and silt layer k is 2 ~ 4 layers, and wherein the number of plies of filling silt layer is k;
(3) determine that order and the timed delivery of filling band replace the number of filling band: adopt the mode every band filling, the filling band of first filling odd-numbered, refills the filling band of even-numbered, or on the contrary; Select k+1 filling band as one group of timed delivery for filling band;
(4) soil stripping laydown area is determined: one group of timed delivery replaced non-of the vicinity group filling band of filling band to replace the soil stripping laydown area of filling band as this group timed delivery, laydown area puts subarea by middle part table mound, and both sides cubsoil is stacked subarea and formed; It is 1 ~ 2.5m that table mound puts subarea height, and it is that 2 ~ 4m forms cubsoil dam that cubsoil stacks subarea height; Before the cubsoil of non-of vicinity group filling band stacks subarea stacking cubsoil, the native table mound being deposited in this filling band of also peeling off in the lump of table that cubsoil stacks subarea is put in subarea; If one group of timed delivery is Reclamation by filling band for non-of the vicinity group filling band of filling band, its band both sides are in table earthen backfill work progress, vacate the region not covering table soil and stack subarea as this group timed delivery for the cubsoil of filling band, in the middle of its band, the region of covering table soil puts subarea as this group timed delivery for the table mound of filling band;
(5) timed delivery is peeled off for the soil layering of filling band: carry out for filling band the delamination showing soil, cubsoil to each group timed delivery: first, by this group timed delivery for filling band topsoil stripping, cover thickness is 0.2 ~ 0.5m, and the table mound of stripping is placed on contiguous non-group # add 1 or subtract 1 filling band in the middle of table mound put on subarea, and the table soil non-for this vicinity group filling band cubsoil being stacked subarea is also peeled off in the lump and is deposited in its table mound and puts on subarea, soil conservation measure is taked to cover and the grass of plantation loam; Then timed delivery is peeled off for the cubsoil of filling band the cubsoil stacking subarea being deposited in contiguous non-group filling band, form cubsoil dam, cover for follow-up backfill;
(6) alternate multiple filling silt layer-draining-covering subsoil is successively carried out to often organizing timed delivery for filling band: for filling band, alternately filling is carried out to each group timed delivery, first filling silt layer from first timed delivery replaces filling band, when after the silt layer thickness 0.2 ~ 1m reaching setting, start filling second timed delivery for filling band, when after the silt layer thickness 0.2 ~ 1m reaching setting, carry out next timed delivery again for filling band, so carry out, be performed until kth+1 timed delivery for filling band; Each timed delivery, for after the complete layer of mud sand bed of filling strip filling, keeps the sediment deposition time of 1 ~ 3 day, then adopts dark drain ditch to add the mode draining of geotextiles; After the silt layer draining drying of filling, stack subarea from the cubsoil of contiguous non-group filling band and fetch earth, cover cubsoil by the subsoil thickness of design, subsoil thickness is 0.15 ~ 0.4m; After each timed delivery completes for filling strip filling covering subsoil, then carry out the filling of lower one deck silt layer by same way, until this group timed delivery replaces each filling bar tape alternation filling of filling band to complete;
(7) backfill of table soil: after completing the structure of all silt layers and subsoil, puts subarea from the table mound of contiguous non-group filling band, transports table soil back and carries out backfill covering and smooth; After the whole filling band of coal mine subsidence land completes filling, smooth in the lump.
2. method as claimed in claim 1, is characterized in that, shows mound and put subarea and both sides cubsoil to stack the width determination concrete grammar in subarea as follows in contiguous non-the group filling band of described step (4):
(41) set the width of each filling band as W, length is L, and wherein table mound puts subarea width is W
1, it is W that both sides cubsoil stacks subarea width
2, soil stripping thickness is d, and wherein topsoil stripping thickness is a, and table mound puts subarea and cubsoil stacking cross section, subarea is a natural inclined trapezoidal, and it is h that table mound puts subarea height
1, it is h that cubsoil stacks subarea height
2;
(42) timed delivery stacks the table soil on subarea for the table soil of filling band and contiguous non-group filling band both sides cubsoil, is deposited in the lump to show mound in the middle part of contiguous non-group filling band and put subarea, therefore its table mound puts the width W in subarea
1=(W+2W
2) * a/h
1+ h
1;
(43) timed delivery is deposited in cubsoil stacking subarea, contiguous non-group filling band both sides for the cubsoil of filling band, form cubsoil dam, therefore cubsoil stacks the width W in subarea
2=W (d-a)/(2h
2)+h
2;
(44) filling band width W, table mound put subarea W
1subarea W is stacked with cubsoil
2pass is W>=W
1+ 2W
2.
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