CN110140467B - Reconstruction method of southern paddy field damaged soil - Google Patents
Reconstruction method of southern paddy field damaged soil Download PDFInfo
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- CN110140467B CN110140467B CN201910543211.2A CN201910543211A CN110140467B CN 110140467 B CN110140467 B CN 110140467B CN 201910543211 A CN201910543211 A CN 201910543211A CN 110140467 B CN110140467 B CN 110140467B
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- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
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Abstract
The invention provides a reconstruction method of damaged soil in a southern paddy field, belonging to the technical field of southern paddy field cultivation, and the method comprises the following steps: 1) stripping soil with the depth of 0-100 cm in a damaged soil area of the rice field, and dividing the stripped soil into upper soil, middle soil and lower soil; 2) filling red sandstone with the grain diameter of 2-40 cm, red sandstone with the grain diameter smaller than 2cm and stripped lower soil in the depth (50-100) cm of the damaged area of the rice field after the soil is stripped to form a reconstructed bottom layer; 3) paving a red sandstone layer and stripped middle-layer soil on the upper surface of the reconstructed bottom layer from bottom to top in sequence to form a reconstructed middle layer; 4) and backfilling the stripped upper soil on the reconstruction middle layer to form a reconstruction upper layer, and completing reconstruction of the damaged soil of the rice field. The method ensures that the rice field can meet the basic requirements required by mechanical and manual cultivation in a short time, and ensures that the planting and production functions of the rice field can be normally carried out.
Description
Technical Field
The invention belongs to the technical field of southern paddy field cultivation, and particularly relates to a method for reconstructing damaged soil of a southern paddy field.
Background
Currently, with the modernization and mechanization of agricultural production and management being accelerated, the characteristics of agricultural ploughing machines such as harvesters and rice transplanters, such as rapidness and convenience, are gradually closely concerned by agricultural operators, and are widely applied to the whole production process of rice planting and harvesting. However, due to long-term mechanized operation, traditional unreasonable planting management system and some production and construction activities (infrastructure construction such as coal mining, road widening, foreign soil excavation, pipelines and the like) (Lemna delavayi. evaluation of damaged land suitability in mining areas and reclamation planning research [ D ]. university of Shanxi agriculture, 2014.), field soil settlement and collapse are caused, soil is excessively compacted, the original structure of the soil is damaged, the porosity, the volume weight, the three-phase ratio and numerous physical properties of paddy soil are changed (Wang En 230222223022, Chengxian, large mechanical operation on the three-phase ratio of the cultivated land soil in the black soil area, compared with the influence of available nutrients [ J ] water and soil conservation academic newspaper, 2007(04):98-102.), the quality and the environment of the paddy soil are seriously influenced, and the growth of crop roots and the reduction of crop yield are more directly influenced. In addition, the compression and the destruction of the farming space of the rice field not only enable the rice field to present a hollow and sunken landscape pattern, but also bring much inconvenience to mechanical work and increase the workload and the danger during manual farming.
Agricultural mechanized construction has certain requirements on the cultivation environment and the field conditions of the rice field, such as: factors such as the position of a field, the flatness of the field surface, the cultivation area, the soil quality and the like have the influence on the mechanical work caused by the collapsed rice field. In order to utilize the convenience of mechanical cultivation and ensure the smooth implementation of mechanical operation, the traditional method is to simply fill the pit with foreign soil or directly fill the damaged area with soil stripped in situ, but the mode cannot play a lasting effect, and the secondary collapse of the rice field is caused after the rice transplanting and the watering.
The most common and direct method at present is to directly backfill and reconstruct the original soil or the foreign soil, mainly aiming at constructing a plough bottom layer and a plough layer which are necessary for the paddy field, but the stability of the soil body structure is not maintained enough, and the permanence of the reconstruction engineering needs to be strengthened.
The red sandstone is widely applied in the embankment filling technology at present, but the case of being used as a filler in the soil reconstruction process is not seen yet. Although the structural and engineering characteristics of red sandstone are studied more, the application of red sandstone in practice needs to be strengthened.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for reconstructing damaged soil in southern paddy field using red sandstone as an important reconstruction raw material.
In order to achieve the above purpose, the invention provides the following technical scheme:
a reconstruction method of damaged soil of southern paddy field comprises the following steps:
1) stripping soil with the depth of 0-100 cm in the damaged soil area of the rice field, and dividing the stripped soil into upper soil, middle soil and lower soil according to the depth of (0-20) cm, (20-50) cm and (50-100) cm;
2) filling red sandstone with the grain diameter of 2-40 cm, red sandstone with the grain diameter smaller than 2cm and stripped lower soil in the depth (50-100) cm of the damaged area of the rice field after the soil is stripped to form a reconstructed bottom layer;
3) paving a red sandstone layer and stripped middle-layer soil on the upper surface of the reconstructed bottom layer from bottom to top in sequence to form a reconstructed middle layer;
4) and backfilling the stripped upper soil on the reconstruction middle layer to form a reconstruction upper layer, and completing reconstruction of the damaged soil of the rice field.
Preferably, the red sandstone layer in the step 3) is paved with red sandstone with the grain size of less than 2 cm.
Preferably, the reconstruction bottom layer is divided into a first reconstruction bottom layer and a second reconstruction bottom layer from bottom to top in sequence;
the first reconstruction bottom layer is filled with a mixture of red sandstones with grain sizes of 2-40 cm and stripped lower-layer soil, and the thickness of the first reconstruction bottom layer is 25-35 cm;
the second reconstruction bottom layer is filled with a mixture of the red sandstone with the grain diameter smaller than 2cm and the stripped lower-layer soil, and the thickness of the second reconstruction bottom layer is 15-25 cm.
Preferably, the thickness of the red sandstone layer in the step 3) is 8-12 cm.
Preferably, the reconstructed bottom layer is filled with a mixture of red sandstone with the grain size of 2-40 cm, red sandstone with the grain size of less than 2cm and stripped lower-layer soil.
Preferably, the reconstruction middle layer further comprises a clay interlayer; the clay interlayer is positioned between the upper surface of the reconstructed bottom layer and the red sandstone layer.
Preferably, clay is laid on the clay interlayer in the step 3); the thickness of the clay interlayer is 4-6 cm.
Preferably, the thickness of the red sandstone layer is 4-6 cm.
Preferably, the thickness of the stripped middle layer soil laid on the red sandstone layer in the step 3) is 18-22 cm.
Preferably, the step 2) of compacting after filling the red sandstone with the grain size of 2-40 cm, the red sandstone with the grain size of less than 2cm and the stripped lower soil layer.
The invention has the beneficial effects that: the reconstruction method of the damaged soil of the southern paddy field provided by the invention utilizes the red sandstone as an important reconstruction raw material to carry out layered filling and reconstruction with the stripped soil, takes proper and appropriate soil reconstruction measures for the damaged soil of the paddy field by using the red sandstone as a filling material on the basis of the traditional soil stripping and filling and combining the technologies of soil layered stripping, stacking and backfilling, so that the paddy field can meet the basic requirements required by mechanical and manual cultivation in a short time, and the planting and production functions of the paddy field can be ensured to be normally carried out; the method adopts local materials, so that huge capital cost of soil reconstruction can be saved, reasonable utilization of regional resources can be realized, the bearing capacity of damaged land is improved, and the requirement on the quality of a rice field during mechanical work is met; the soil reconstructed by the method can meet the production requirement in a short time, and the quality and the productivity of the soil before the damage of the rice field can be recovered as much as possible under the action of a plurality of factors such as water flow and the like, so that the production function of the rice field is ensured; the implementation of the method leads to a good theory and technical thought for the development of land improvement and restoration in a specific area, and also provides an effective method for protecting cultivated land resources.
Drawings
FIG. 1 is a flow chart of the method of the present invention applied to the reconstruction of damaged soil in southern rice fields;
FIG. 2-1 is a schematic view of a paddy field damaged soil of a paddy field excavation type;
FIG. 2-2 is a schematic view showing the damaged soil of the paddy field which causes soil subsidence by mining around the paddy field;
FIG. 3 is a schematic view of damaged soil stripping and red sandstone treatment according to the present invention;
FIG. 4-1 is a schematic view of a first rice field damaged soil restructuring process according to the present invention;
FIG. 4-2 is a schematic view of the second damaged paddy field soil restructuring operation according to the present invention.
Detailed Description
The invention provides a reconstruction method of damaged soil in a southern paddy field, which comprises the following steps: 1) stripping soil with the depth of 0-100 cm in a damaged soil area of a rice field, dividing the stripped soil into upper soil, middle soil and lower soil according to the depth of (0-20) cm, (20-50) cm and (50-100) cm, 2) filling red sandstone with the grain diameter of 2-40 cm, red sandstone with the grain diameter of less than 2cm and the stripped lower soil in the damaged area of the rice field with the stripped soil to form a reconstructed bottom layer, 3) laying a red sandstone layer and the stripped middle soil on the upper surface of the reconstructed bottom layer from bottom to top to form a reconstructed middle layer, and 4) backfilling the stripped upper soil on the reconstructed middle layer to form a reconstructed upper layer to finish reconstruction of the damaged soil of the rice field.
The invention provides a reconstruction method of damaged soil in a southern paddy field, which is characterized in that the soil stripped in the damaged paddy field is sequentially stacked and backfilled in layers, and meanwhile, red sandstone around the southern paddy field with rich reserves is filled into the damaged paddy field area according to a preset process flow to carry out soil reconstruction work so as to maintain subsequent normal agricultural production activities of farming, fertilization, irrigation and the like of the paddy field.
Red sandstone is a sedimentary rock, iron ions in the sandstone form iron oxide through oxidation, the iron oxide is red, the red sandstone belongs to soft rock which is easy to weather and soften, and the red sandstone mainly comprises two components of clastic minerals and clay minerals (Liu hongjie, research on engineering properties of red argillaceous sandstone road building materials [ D ] Hefei industrial university, 2005.). The clay minerals comprise montmorillonite, illite, kaolin, chlorite and the like, have obvious expansibility (Gancinnan. test research and application of engineering characteristics of red sandstone [ D ]. Fertilizer industry university 2014.; Wuchuan. research on expansibility of red sandstone slope failure mechanism and reinforcement technology [ D ]. Changsha university 2013.), are main factors influencing the engineering properties of the red sandstone (in Lihong, Zhang Xijie. characteristics and engineering classification of red sandstone suggest [ C ]// China Association of science year-8 transportation infrastructure safety and durability forum 2015.) for highway construction in Guangdong regions, and the kaolinite and the illite in the clay minerals are easy to quickly expand, soften and finally break after meeting water; meanwhile, because the montmorillonite has stronger hydrophilicity and is easily separated by oxygen bonds in water molecules, the montmorillonite is more favorable for the expansion of the red sandstone. The sandstone in China is rich in variety, but the red sandstone is mainly distributed in regions such as the southwest, the southeast and the east of China (Liujianglong, the research on the landform formation mechanism and the geological effect thereof in the southeast of China [ D ]. the university of the southwest, 2009.), mainly Sichuan, Yunnan, Guangdong and other provinces, has fine and smooth particles, softer texture and smaller influence degree of pollution. The red sandstone is a zero-radioactivity material, has no harm to human bodies, is not easy to weather outdoors, is not easy to dissolve in water, and has stable color (the hydration characteristics of the red sandstone and the improvement technology thereof research [ J ] road engineering, 2010,35 (1)). Meanwhile, the clay mineral has the excellent characteristics that the clay mineral has plasticity after being wetted by water, can deform under a smaller pressure and can keep the original shape for a long time, and water is not easy to pass through the clay mineral, and the red sandstone has the characteristics, so that the red sandstone is used as an important carrier for destroying the reconstruction of the soil in the rice field. According to the invention, the red sandstone which is peculiar to the local southern area is used as a raw material for soil reconstruction, the red sandstone in the area adjacent to the rice field is collected, and the red sandstone is collected by combining the damage degree and the size (shown in figures 2-1 and 2-2) of the rice field, and the red sandstone rock is screened and crushed into the size with the proper grain size for later use.
According to the method, firstly, the soil with the depth of 0-100 cm in the damaged soil area of the rice field is stripped, and the stripped soil is divided into upper-layer soil, middle-layer soil and lower-layer soil according to the depth of (0-20) cm, (20-50) cm and (50-100) cm.
According to the invention, before soil in the damaged soil area of the rice field is stripped, the damage degree and the type of the damaged soil of the rice field are preferably judged, red sand and stone required for reconstruction are predicted, and the red sand and stone are collected from a red sand and stone gathering place near the rice field. In the present invention, the judgment of the damage degree is preferably carried out by artificially observing a region suspected to be damaged around the paddy field (observing the appearance of characteristics related to the deterioration of soil quality such as a difference in the growth potential of crops and the presence of depressions) and the likeAnd comparing the surrounding rice fields to determine the damaged soil, and further observing and analyzing the soil volume weight data of the damaged area under the condition permission to clearly determine the damaged area. The reconstruction method provided by the invention is more suitable for the damaged soil area of the rice field with the depth of 0.4-1 m and the volume of 0.4-2 m3And (5) reconstructing damaged soil areas of the rice field within the range.
In the method, red sandstone with the grain diameter of 2-40 cm, red sandstone with the grain diameter of less than 2cm and stripped lower soil are filled in a depth (50-100 cm) of a damaged area of a rice field after the soil is stripped to form a reconstructed bottom layer, the reconstructed bottom layer is preferably divided into a first reconstructed bottom layer and a second reconstructed bottom layer from bottom to top for the depth (50-100 cm) of the damaged area of the excavated rice field, the first reconstructed bottom layer is filled with a mixture of the red sandstone with the grain diameter of 2-40 cm and the stripped lower soil, the thickness of the first reconstructed bottom layer is preferably 25-35 cm and more preferably 30cm, the second reconstructed bottom layer is filled with a mixture of the red sandstone with the grain diameter of less than 2cm and the stripped lower soil, the thickness of the second reconstructed bottom layer is preferably 15-25 cm and more preferably 20 cm., and the thicknesses of the two mixed layers can also be adapted according to the size distribution condition of the red sandstone collected actually When the adjustment is carried out, the stability of the lower soil body structure is ensured.
In the invention, red sandstone with the grain diameter of 2-40 cm is preferably filled in the depth (50-100) cm of a subsidence type rice field damage area, and then red sandstone with the grain diameter of less than 2cm and stripped lower soil are filled in gaps of the red sandstone with the grain diameter of 2-40 cm.
The present invention preferably further comprises a compaction step after said filling is completed. The method and means of compaction described herein are not particularly critical and are contemplated as being conventional in the art. In the invention, the soil volume weight of the reconstructed bottom layer is preferably the same as that of a soil layer in an undamaged area (50-100 cm in depth) of the rice field, the same soil volume weight value is equivalent to the soil volume weight value and is not limited to be the same as the soil volume weight value.
After a reconstruction bottom layer is formed, a red sandstone layer and stripped middle-layer soil are sequentially paved on the upper surface of the reconstruction bottom layer from bottom to top to form a reconstruction middle layer. In the invention, the red sandstone layer is paved with red sandstone with the grain diameter of less than 2 cm. In the invention, for the damaged area of the excavated and damaged paddy field, the thickness of the red sandstone layer is preferably 8-12 cm, and more preferably 10 cm; the thickness of the stripped middle layer soil laid on the red sandstone layer is preferably 18-22 cm, and more preferably 20 cm. In the invention, for the damaged area of the digging damage type paddy field, the reconstruction middle layer preferably also comprises a clay interlayer; the clay interlayer is positioned between the upper surface of the reconstructed bottom layer and the red sandstone layer. Clay is laid on the clay interlayer; the thickness of the clay interlayer is preferably 4-6 cm, and more preferably 5 cm; the thickness of the red sandstone layer is preferably 4-6 cm, and more preferably 5 cm. The thickness of the stripped middle layer soil laid on the red sandstone layer is preferably 18-22 cm, and more preferably 20 cm. In the invention, the clay laid by the clay interlayer is preferably from the soil with less sand and viscosity in the rice field, and the clay has the viscosity characteristic of being capable of preventing the upper soil from moving down with water, thereby enhancing the protection on the structural stability of the soil body and reducing the possibility of generating pits again. Because the red sandstone has poor water resistance and weather resistance, weathered products are easy to soften, disintegrate, expand and swell under the direct action of water; therefore, the clay interlayer is arranged to maintain the overall stability of the reconstructed soil. In the present invention, the stability of the middle layer in the reconstruction is closely related to the water and fertilizer retention characteristics of the soil.
After the reconstruction middle layer is formed, the stripped upper layer soil is backfilled on the reconstruction middle layer to form a reconstruction upper layer, and the reconstruction of the damaged soil of the rice field is completed. In the invention, the thickness of the reconstructed upper layer is preferably 18-22 cm, and more preferably 20 cm; the reconstructed upper layer is a plough layer; in order to avoid the influence of reconstruction on cultivation, other substances are not easy to add into the reconstructed upper-layer soil, and the stripped upper-layer soil is directly backfilled. In the invention, the horizontal height of the reconstructed upper layer is preferably 3-5 cm higher than the undamaged soil of the rice field; the level height of the reconstructed upper layer is higher than that of the undamaged soil of the rice field, and a compact space is conveniently formed under the action of subsequent irrigation and natural conditions. After the reconstruction of the damaged soil of the rice field is completed, the periphery of the reconstructed area is trimmed preferably by combining the peripheral undamaged rice field, so that the flatness of the rice field is ensured, and the fluency of subsequent cultivation is guaranteed.
In the operation process of the invention, the mass ratio of the red sandstone with the grain diameter of 2-40 cm to the red sandstone with the grain diameter of less than 2cm is preferably (1.8-2.2): 1, and more preferably 2: 1. In the invention, the ratio of the total volume of the stripped upper layer soil, middle layer soil and lower layer soil to the total volume of the red sandstone is preferably (2.5-3.5): 2, and more preferably 3: 2.
After the reconstruction of the damaged soil in the rice field is finished, the damaged soil is preferably deposited for half a month under the action of natural environment and the condition of rice field irrigation, so that the method is gradually adapted to the new soil environment after the reconstruction, and the requirements of gradually recovering the soil fertility and the production conditions required by manual and mechanical normal operation of the damaged rice field are ensured.
The invention improves the soil quality through subsequent continuous and reasonable cultivation, the volume weight of the soil is equivalent to that of the soil in the peripheral area, so that the damaged soil of the rice field is gradually and stably sunk, and the soil quality level under the undamaged state is reached.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The implementation place is as follows: one rice field in the Bingmen area of Zhuhai city, Guangdong province.
The number of paddy fields in the sluice gate area is large, agricultural cultivation with a certain scale has been developed in the area, and the soil types include paddy soil, red soil and saline marsh soil in delta. At present, mechanical farming dynamics constantly increases, and most paddy fields all use machinery to reap, sow, but mechanical farming is higher to the requirement in work place, and soil suffers destruction easily to lead to the phenomenon that pothole, damage appear in part paddy field region, make mechanical operation and manual management receive the influence.
Two typical soil damage areas were selected
The A part is excavated damage type soil damage, and the B part is subsidence type soil damage. A, B are reconstructed separately for each of the two soil damage areas.
Soil damaged area at A
The grain size of the red sandstone collected in the area adjacent to the rice field is mainly concentrated in 1-40 cm, and the red sandstone is placed in different areas after being screened and crushed;
when the soil is stripped, the soil is divided into upper soil, middle soil and lower soil according to the length of (0-20) cm, (20-50) cm and (50-100) cm, the soil is sequentially stripped and separately stacked, and soil layers are marked;
(50-100) cm depth area, sequentially filling a mixture layer of the red sandstone with the grain diameter of 2-40 cm and the stripped lower layer soil of 30cm and a mixture layer of the red sandstone with the grain diameter of less than 2cm and the stripped lower layer soil of 20cm from bottom to top, and compacting by using a shovel.
And paving 10cm of red sandstone layer with the grain size smaller than 2cm and 20cm of stripped middle-layer soil in the depth area range of (20-50) cm from bottom to top to form a reconstructed middle layer.
The horizontal height of upper soil backfilled and peeled in the depth area range of (0-20) cm is 5cm higher than that of undamaged soil of the rice field, and the periphery of the reconstructed area is trimmed by combining the undamaged rice field at the periphery so as to ensure the flatness of the rice field and guarantee the fluency of subsequent cultivation.
The thickness (or depth) after reconstruction in the depth region range of (50-100) cm, the depth region range of (20-50) cm and the depth region range of (0-20) cm described in this embodiment is not particularly specified.
Soil damage area at B
The grain size of the red sandstone collected in the area adjacent to the rice field is mainly concentrated in 1-40 cm, and the red sandstone is placed in different areas after being screened and crushed;
when the soil is stripped, the soil is divided into upper soil, middle soil and lower soil according to the length of (0-20) cm, (20-50) cm and (50-100) cm, the soil is sequentially stripped and separately stacked, and soil layers are marked;
filling red sandstone with the depth of (50-100) cm and the grain diameter of 2-40 cm, filling red sandstone with the grain diameter of less than 2cm and stripped lower soil in gaps of the red sandstone with the grain diameter of 2-40 cm, and compacting by using a shovel.
(20-50) paving a clay interlayer of 5cm, a red sandstone of 5cm and stripped middle-layer soil of 20cm from bottom to top in sequence to form a reconstructed middle layer, wherein the clay layer is used for strengthening the stability of a protective soil body structure and preserving water and fertilizer.
The horizontal height of the upper soil layer stripped by the (0-20) cm backfill is 5cm higher than that of the undamaged soil of the rice field, and the periphery of the reconstructed area is trimmed by combining the undamaged rice field at the periphery so as to ensure the flatness of the rice field and guarantee the fluency of subsequent cultivation.
The pH of the soil of the plough layer of the rice field before reconstruction of the rice field at the position A is 6.33, the organic matter content is 34.10g/kg, the pH of the soil of the plough layer after reconstruction is 6.81, and the organic matter content is 37.21 g/kg; the pH of the soil in the plough layer of the rice field before reconstruction of the rice field B is 6.59, the organic matter content is 33.60g/kg, the pH of the soil in the plough layer after reconstruction is 6.26, and the organic matter content is 36.07 g/kg. The fertility of the rice field soil plough layer is kept better after reconstruction.
The volume weight of the plough layer before reconstruction of the rice field A is 1.42g/cm3And after deposition, the volume weight of the reconstructed plough layer soil is measured to be 1.28g/cm3. The volume weight of the plough layer before reconstruction of the rice field B is 1.20g/cm3And measuring the volume weight of the reconstructed plough layer soil after deposition to be 1.34g/cm3. Compared with the total condition of the soil which is not damaged at the periphery, the soil volume weight of the plough layer before and after soil reconstruction has better experimental result.
It can be seen that the basic physicochemical properties of the soil are not changed obviously before and after the reconstitution, and the soil is always acidic (the pH value is mainly between 6 and 7). And measuring the volume weight of the soil at the later stage of soil reconstruction to obtain the volume weight of the soil close to the volume weight of the area which is not damaged.
The function of the reconstructed area in the aspect of planting rice can be matched with the surrounding undamaged area, the manual management and the mechanical work in the rice planting period are not affected, and the growth vigor of the rice is good. The reconstruction work avoids the disadvantages brought by the damage of the rice field to the cultivation, and ensures the water and fertilizer retention effect and the production and planting capacity of the rice field.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A reconstruction method of damaged soil of southern paddy field comprises the following steps:
1) stripping soil with the depth of 0-100 cm in the damaged soil area of the rice field, and dividing the stripped soil into upper soil, middle soil and lower soil according to the depth of 0-20 cm, 20-50 cm and 50-100 cm;
2) filling red sandstone with the grain diameter of 2-40 cm, red sandstone with the grain diameter smaller than 2cm and stripped lower soil into the damaged area of the rice field with the depth of 50-100 cm after the soil is stripped, so as to form a reconstructed bottom layer;
3) laying a red sandstone layer with the particle size of less than 2cm and stripped middle-layer soil on the upper surface of the reconstructed bottom layer from bottom to top in sequence to form a reconstructed middle layer;
the reconstruction middle layer also comprises a clay interlayer; the clay interlayer is positioned between the upper surface of the reconstructed bottom layer and the red sandstone layer;
4) and backfilling the stripped upper soil on the reconstruction middle layer to form a reconstruction upper layer, and completing reconstruction of the damaged soil of the rice field.
2. The reconstruction method according to claim 1, wherein the reconstruction bottom layer is divided into a first reconstruction bottom layer and a second reconstruction bottom layer from bottom to top;
the first reconstruction bottom layer is filled with a mixture of red sandstones with the grain size of 2-40 cm and stripped lower-layer soil, and the first reconstruction bottom layer is filled with a mixture of red sandstones with the grain size of 2-40 cm and stripped lower-layer soil
The thickness of the reconstructed bottom layer is 25-35 cm;
the second reconstituted bottom layer is filled with a mixture of red sandstones with a grain size of less than 2cm and stripped underlying soil, the second reconstituted bottom layer is filled with a second mixture of red sandstones with a grain size of less than 2cm and stripped underlying soil
The thickness of the reconstructed bottom layer is 15-25 cm.
3. The method of claim 2, wherein the thickness of said red sand layer in step 3) is 8 to c
12cm。
4. The method of claim 1, wherein the reconstituted underfill is a mixture of red sandstone with a grain size of 2-40 cm, red sandstone with a grain size of less than 2cm, and exfoliated sub-soil.
5. The method of claim 1, wherein the clay interlayer in step 3) is laid with clay;
the thickness of the clay interlayer is 4-6 cm.
6. The method of claim 4, wherein the red sandstone layer has a thickness of 4-6 cm.
7. The reconstruction method according to claim 1 or 4, wherein the thickness of the stripped middle layer soil laid on the red sandstone layer in the step 3) is 18-22 cm.
8. The reconstruction method according to claim 1, wherein the step 2) of compacting the filled red sandstone with a grain size of 2-40 cm, the filled red sandstone with a grain size of less than 2cm and the stripped lower soil layer.
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