阅读说明：本技术 一种粘性土壤改良剂、制备方法以及粘性土壤改良方法 (Cohesive soil conditioner, preparation method and cohesive soil conditioning method ) 是由 陈怀生 梁守明 钟君然 于 2021-09-27 设计创作，主要内容包括：本发明公开了一种粘性土壤改良剂、制备方法以及粘性土壤改良方法,属于土壤改良技术领域。其中,粘性土壤改良剂包括：按重量份计,固体添加物料500-1000份、有机生物肥350-550份和复合微生物菌剂40-70份；所述固体添加物料包括：细沙80-120份、沸石60-90份、褐煤粉20-40份、膨胀石墨粉10-20份、三萜皂苷1-2份和木质素磺酸钠1-2份。本发明采用固体添加物料进行物理改良,有机生物肥和复合微生物菌剂进行生物化学改良,多种改良方法共同协同作用,综合有效改良提高黏土改良剂具有改良粘性土壤理化性质,避免土壤板结,提高土壤有机质含量。(The invention discloses a cohesive soil conditioner, a preparation method and a cohesive soil conditioning method, and belongs to the technical field of soil conditioning. Wherein, the cohesive soil conditioner comprises: according to the parts by weight, 500-1000 parts of solid addition material, 550 parts of organic biological fertilizer and 40-70 parts of composite microbial agent; the solid additive material comprises: 80-120 parts of fine sand, 60-90 parts of zeolite, 20-40 parts of lignite powder, 10-20 parts of expanded graphite powder, 1-2 parts of triterpenoid saponin and 1-2 parts of sodium lignosulfonate. According to the invention, solid added materials are adopted for physical improvement, the organic bio-fertilizer and the compound microbial agent are used for biochemical improvement, and multiple improvement methods are used for synergistic effect, so that the clay conditioner is comprehensively and effectively improved, the physicochemical property of the clay conditioner for improving the viscous soil is improved, the soil is prevented from hardening, and the organic matter content of the soil is improved.)

1. A cohesive soil amendment, comprising: according to the parts by weight, 500-1000 parts of solid addition material, 550 parts of organic biological fertilizer and 40-70 parts of composite microbial agent;

the solid additive material comprises: 80-120 parts of fine sand, 60-90 parts of zeolite, 20-40 parts of lignite powder, 10-20 parts of expanded graphite powder, 1-2 parts of triterpenoid saponin and 1-2 parts of sodium lignosulfonate.

2. A cohesive soil amendment according to claim 1, comprising: according to the parts by weight, the solid addition material comprises 900 parts of 700-one, 500 parts of 400-one organic biological fertilizer and 50-60 parts of composite microbial agent.

3. A cohesive soil amendment according to claim 1 or 2, characterized in that said organic bio-fertilizer comprises: 40-60 parts of oil cake, 30-50 parts of straw, 20-40 parts of dead branch and 15-30 parts of fallen leaves.

4. A cohesive soil amendment according to claim 1 or 2, wherein the complex microbial inoculant comprises: 5-7 parts of aspergillus flavus, 1-1.5 parts of streptomyces griseus, 0.5-1 part of bacillus subtilis and 1.5-2.5 parts of trichoderma.

5. A process for preparing a cohesive soil amendment according to any one of claims 1 to 4, comprising the steps of:

(1) crushing oil cakes, straws, dry branches and fallen leaves in the organic biological fertilizer into 2-3cm in diameter and uniformly mixing to obtain a biological fertilizer mixture;

(2) uniformly mixing fine sand, zeolite, brown coal powder and expanded graphite powder in the solid additive material to obtain a solid additive mixture, and separately packaging triterpenoid saponin and sodium lignosulfonate;

(3) uniformly mixing aspergillus flavus, streptomyces griseus, bacillus subtilis and trichoderma in the compound microbial agent to obtain a microbial agent mixture;

(4) and respectively packaging the bio-fertilizer mixture, the solid addition mixture and the microbial inoculum mixture.

6. A method for improving a cohesive soil by using the cohesive soil improving agent according to any one of claims 1 to 4, comprising the steps of:

(1) adding quicklime into the viscous soil, and crushing the viscous soil after the viscous soil is dried;

(2) adding the solid additive materials except the triterpenoid saponin and the sodium lignosulfonate into the crushed viscous soil, uniformly mixing, and adding water for first maintenance;

(3) uniformly mixing the organic bio-fertilizer and the compound microbial agent, and adding the residual triterpenoid saponin and sodium lignosulfonate in the solid additive material for uniformly mixing to obtain a repairing material;

(4) and after the first curing is finished, adding part of the repairing material into the soil, uniformly mixing, covering the residual repairing material on the surface of the viscous soil, and performing second curing.

7. The method for improving cohesive soil according to claim 6, wherein the amount of the cohesive soil improvement agent added is 10 to 12 wt% based on the mass of the cohesive soil.

8. The method for improving cohesive soil according to claim 6, wherein the amount of quicklime added in step (1) is 0.5 to 1.5% by mass of the cohesive soil, and the pH of the cohesive soil is adjusted to 7 to 8.

9. The method for improving cohesive soil according to claim 6, wherein the conditions for the first curing in step (2) are: the amount of the added water is 15-20% of the mass of the cohesive soil, and the maintenance time is 2-3 days.

10. The method for improving cohesive soil according to claim 6, wherein the thickness of the repair mass covered with the cohesive soil in step (4) is 3 to 7 cm; the second curing time is 15-25 days.

Technical Field

The invention relates to the technical field of soil improvement, in particular to a cohesive soil conditioner, a preparation method and a cohesive soil improvement method.

Background

The cohesive soil is mainly distributed in Yangtze river basin in China, is called as cohesive soil and refers to soil with low sand content, fine particles, low water seepage speed, good water retention performance and poor ventilation performance. The clay soil has plasticity index greater than 10 and particle size greater than 0.075mm and contains no more than 50% of clay, including clay sand, sand-containing low liquid limit clay, high liquid limit clay sand, sand-containing high liquid limit clay and high liquid limit clay. Such soils are typically 45% physically clay-containing, fine (viscous weight) and include clay and heavy loam and portions of medium loam of clay-like nature.

With the development of economy, the land is increasingly emphasized, but the cohesive soil is not beneficial to the planting of crops, and the main reasons are as follows: clay soil has poor permeability, fine particles, small inter-particle pores, poor ventilation and water permeation and unsmooth drainage; the soil temperature variation is small, the moisture content of the cohesive soil is high, the air is relatively little, the ground temperature rises and falls slowly, particularly in early spring, the temperature is low, the soil temperature is not easy to rise again, and the growth of garden plants is not facilitated; due to the fact that the clay soil is large in specific surface area, the soil is strong in cohesiveness, adhesiveness, plasticity and wet swelling, newly transplanted seedlings cannot breathe effectively, root rot is easily caused, and accordingly the seedlings die. In addition, in recent years, unreasonable use of chemical fertilizers and pesticides damages the living environment of microorganisms, so that the soil viscosity is increased, the root system of a plant cannot grow normally, the nutrition in the soil cannot be absorbed, and the survival rate of the plant is reduced.

Currently, the improvement of cohesive soil is commonly performed by using a curing agent: (1) the lime is added to improve the strength of the improved soil through the mechanisms of digestion, ion exchange, carbonation and the like. (2) The cement is added, and a skeleton structure is formed through the hydrolytic hydration reaction of the cement, so that the cohesive force of the improved cohesive soil is enhanced, and the property of the cohesive soil is improved. (3) The fine sand is added, so that the porosity of the cohesive soil is improved, the water permeability is increased, the water permeability is enhanced, the expansion and contraction characteristics of the cohesive soil are improved, and the original soil particle structure is broken. (4) The zeolite is added, so that the ion exchange function is good, the nutrient utilization rate of the cohesive soil is improved, the soil quality is improved obviously, and meanwhile, the zeolite material can play a buffering role in applied nitrogen, so that the retention capacity of the soil to the nitrogen is enhanced, and the nitrogen utilization rate is improved.

The above improvement methods have limited effects, and cannot improve the cohesive soil more efficiently, so that the cohesive soil is changed into high-quality planting soil.

Disclosure of Invention

The invention aims to provide a cohesive soil improvement agent, a preparation method and a cohesive soil improvement method, and aims to solve the problem that the cohesive soil cannot be improved more efficiently in the conventional cohesive soil improvement and can be changed into high-quality planting soil.

The technical scheme for solving the technical problems is as follows:

a cohesive soil amendment comprising: according to the parts by weight, 500-1000 parts of solid addition material, 550 parts of organic biological fertilizer and 40-70 parts of composite microbial agent;

the solid additive material comprises: 80-120 parts of fine sand, 60-90 parts of zeolite, 20-40 parts of lignite powder, 10-20 parts of expanded graphite powder, 1-2 parts of triterpenoid saponin and 1-2 parts of sodium lignosulfonate.

Further, the cohesive soil conditioner of the invention comprises: according to the parts by weight, the solid addition material comprises 900 parts of 700-one, 500 parts of 400-one organic biological fertilizer and 50-60 parts of composite microbial agent.

Further, in the cohesive soil conditioner of the present invention, the organic bio-fertilizer includes: 40-60 parts of oil cake, 30-50 parts of straw, 20-40 parts of dead branch and 15-30 parts of fallen leaves.

Further, in the cohesive soil conditioner of the present invention, the complex microbial agent includes: 5-7 parts of aspergillus flavus, 1-1.5 parts of streptomyces griseus, 0.5-1 part of bacillus subtilis and 1.5-2.5 parts of trichoderma.

The invention provides a preparation method of the viscous soil conditioner, which comprises the following steps:

(1) crushing oil cakes, straws, dry branches and fallen leaves in the organic biological fertilizer into 2-3cm in diameter and uniformly mixing to obtain a biological fertilizer mixture;

(2) uniformly mixing fine sand, zeolite, brown coal powder and expanded graphite powder in the solid additive material to obtain a solid additive mixture, and separately packaging triterpenoid saponin and sodium lignosulfonate;

(3) uniformly mixing aspergillus flavus, streptomyces griseus, bacillus subtilis and trichoderma in the compound microbial agent to obtain a microbial agent mixture;

(4) and respectively packaging the bio-fertilizer mixture, the solid addition mixture and the microbial inoculum mixture.

The invention also provides a method for improving the cohesive soil, which adopts the cohesive soil conditioner and comprises the following steps:

(1) adding quicklime into the viscous soil, and crushing the viscous soil after the viscous soil is dried;

(2) adding the solid additive materials except the triterpenoid saponin and the sodium lignosulfonate into the crushed viscous soil, uniformly mixing, and adding water for first maintenance;

(3) uniformly mixing the organic bio-fertilizer and the compound microbial agent, and adding the residual triterpenoid saponin and sodium lignosulfonate in the solid additive material for uniformly mixing to obtain a repairing material;

(4) and after the first curing is finished, adding part of the repairing material into the soil, uniformly mixing, covering the residual repairing material on the surface of the viscous soil, and performing second curing.

Further, in the method for improving the cohesive soil of the invention, the addition amount of the cohesive soil improvement agent is 10-12 wt% of the mass of the cohesive soil.

Further, in the method for improving the cohesive soil, the addition amount of the quicklime in the step (1) is 0.5-1.5% of the mass of the cohesive soil, and the pH of the cohesive soil is adjusted to 7-8.

Further, in the method for improving cohesive soil according to the present invention, the conditions for the first curing in step (2) are: the amount of the added water is 15-20% of the mass of the cohesive soil, and the maintenance time is 2-3 days.

Further, in the method for improving cohesive soil of the present invention, the thickness of the repair material covered with the cohesive soil in step (4) is 3 to 7 cm; the second curing time is 15-25 days.

The invention has the following beneficial effects:

1. according to the invention, solid added materials are adopted for physical improvement, the organic bio-fertilizer and the compound microbial agent are used for biochemical improvement, and multiple improvement methods are used for synergistic effect, so that the clay conditioner is comprehensively and effectively improved, the physicochemical property of the clay conditioner for improving the viscous soil is improved, the soil is prevented from hardening, and the organic matter content of the soil is improved.

2. The invention adopts the fine sand and zeolite in the solid added materials as the basis, and the added brown coal powder and expanded graphite powder can improve the porosity of the cohesive soil and increase the water permeability, and in addition, the brown coal powder contains 40 to 82 percent of organic matters, 7 to 17 percent of humic acid and other trace elements, thereby obviously increasing the organic matter content of the soil and improving the soil fertility. And the overall porosity of the modifier in use is improved by the triterpenoid saponin and the sodium lignosulfonate.

3. The microbial agent adopted by the invention is not antagonistic to aspergillus flavus, streptomyces griseus, bacillus subtilis and trichoderma, and can fully play the role of each strain in the modifying agent through the synergistic interaction between the aspergillus flavus, the streptomyces griseus, the bacillus subtilis and the trichoderma. The microbial agent and the organic biological fertilizer play roles, can quickly supplement the contents of organic matters, quick-acting nitrogen, total nitrogen, quick-acting phosphorus and quick-acting potassium which are lacked in the viscous soil, is favorable for increasing the soil fertility and provides nutrient components for the growth of crops.

4. According to the improvement method, quicklime is added into the viscous soil, and the moisture evaporation in the viscous soil is accelerated by utilizing the hygroscopicity and the exothermicity of the quicklime, so that the water content of the viscous soil is reduced, and the soil dispersibility is improved; in addition, the added quicklime can also play a role in disinfecting soil, so that the quality of the planting soil is improved, and in addition, the quicklime can also supplement calcium fertilizer and is also beneficial to releasing fixed nutrient elements in the soil. By combining the mode of mixing the solid additive material with part of the organic biological fertilizer and the compound microbial agent and the mode of covering the part of the organic biological fertilizer and the compound microbial agent, the granular structure of soil can be effectively improved, a capillary channel is blocked, the soil agglomeration phenomenon is improved, and the soil fertilizer is synergized.

Detailed Description

The principles and features of this invention are described below in conjunction with embodiments, which are included to explain the invention and not to limit the scope of the invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

Example 1:

the cohesive soil conditioner of the embodiment comprises: according to the parts by weight, 500 parts of solid additive materials, 350 parts of organic biological fertilizer and 40 parts of compound microbial agent;

wherein, the solid additive material comprises: 80 parts of fine sand, 60 parts of zeolite, 20 parts of lignite powder, 10 parts of expanded graphite powder, 1 part of triterpenoid saponin and 1 part of sodium lignosulfonate.

The organic biological fertilizer comprises: 40 parts of oil cake, 30 parts of straw, 20 parts of dead branch and 15 parts of fallen leaves.

The compound microbial agent comprises: 5 parts of aspergillus flavus, 1 part of streptomyces griseus, 0.5 part of bacillus subtilis and 1.5 parts of trichoderma.

The preparation method of the cohesive soil conditioner comprises the following steps:

(1) crushing oil cakes, straws, dry branches and fallen leaves in the organic biological fertilizer into 2-3cm in diameter and uniformly mixing to obtain a biological fertilizer mixture;

(2) uniformly mixing fine sand, zeolite, brown coal powder and expanded graphite powder in the solid additive material to obtain a solid additive mixture, and separately packaging triterpenoid saponin and sodium lignosulfonate;

(3) uniformly mixing aspergillus flavus, streptomyces griseus, bacillus subtilis and trichoderma in the compound microbial agent to obtain a microbial agent mixture;

(4) and respectively packaging the bio-fertilizer mixture, the solid addition mixture and the microbial inoculum mixture.

Example 2:

the cohesive soil conditioner of the embodiment comprises: according to the weight portion, the solid additive material is 700 portions, the organic biological fertilizer is 400 portions, and the compound microbial agent is 50 portions.

Wherein, the solid additive material comprises: 85 parts of fine sand, 63 parts of zeolite, 22 parts of lignite powder, 13 parts of expanded graphite powder, 1.2 parts of triterpenoid saponin and 1.1 parts of sodium lignosulfonate.

The organic biological fertilizer comprises: 45 parts of oil cake, 33 parts of straw, 24 parts of dead branch and 16 parts of fallen leaves.

The compound microbial agent comprises: 5.6 parts of aspergillus flavus, 1.15 parts of streptomyces griseus, 0.63 part of bacillus subtilis and 1.57 parts of trichoderma.

The preparation method of the cohesive soil conditioner comprises the following steps:

(1) crushing oil cakes, straws, dry branches and fallen leaves in the organic biological fertilizer into 2-3cm in diameter and uniformly mixing to obtain a biological fertilizer mixture;

(2) uniformly mixing fine sand, zeolite, brown coal powder and expanded graphite powder in the solid additive material to obtain a solid additive mixture, and separately packaging triterpenoid saponin and sodium lignosulfonate;

(3) uniformly mixing aspergillus flavus, streptomyces griseus, bacillus subtilis and trichoderma in the compound microbial agent to obtain a microbial agent mixture;

(4) and respectively packaging the bio-fertilizer mixture, the solid addition mixture and the microbial inoculum mixture.

Example 3:

the cohesive soil conditioner of the embodiment comprises: according to the weight portion, 800 portions of solid additive material, 450 portions of organic bio-fertilizer and 55 portions of compound microbial agent.

Wherein, the solid additive material comprises: 90 parts of fine sand, 75 parts of zeolite, 28 parts of lignite powder, 15.7 parts of expanded graphite powder, 1.5 parts of triterpenoid saponin and 1.34 parts of sodium lignosulfonate.

The organic biological fertilizer comprises: 48 parts of oil cake, 42 parts of straw, 32 parts of dead branches and 22 parts of fallen leaves.

The compound microbial agent comprises: 6.2 parts of aspergillus flavus, 1.34 parts of streptomyces griseus, 0.75 part of bacillus subtilis and 1.78 parts of trichoderma.

The preparation method of the cohesive soil conditioner comprises the following steps:

(1) crushing oil cakes, straws, dry branches and fallen leaves in the organic biological fertilizer into 2-3cm in diameter and uniformly mixing to obtain a biological fertilizer mixture;

(2) uniformly mixing fine sand, zeolite, brown coal powder and expanded graphite powder in the solid additive material to obtain a solid additive mixture, and separately packaging triterpenoid saponin and sodium lignosulfonate;

(3) uniformly mixing aspergillus flavus, streptomyces griseus, bacillus subtilis and trichoderma in the compound microbial agent to obtain a microbial agent mixture;

(4) and respectively packaging the bio-fertilizer mixture, the solid addition mixture and the microbial inoculum mixture.

Example 4:

the cohesive soil conditioner of the embodiment comprises: according to the weight portion, 900 portions of solid additive material, 500 portions of organic biological fertilizer and 60 portions of compound microbial agent.

Wherein, the solid additive material comprises: 115 parts of fine sand, 86 parts of zeolite, 36 parts of lignite powder, 10-20 parts of expanded graphite powder, 1-2 parts of triterpenoid saponin and 1-2 parts of sodium lignosulfonate.

The organic biological fertilizer comprises: 40-60 parts of oil cake, 30-50 parts of straw, 20-40 parts of dead branch and 15-30 parts of fallen leaves.

The compound microbial agent comprises: 6.3 parts of aspergillus flavus, 1.42 parts of streptomyces griseus, 0.86 part of bacillus subtilis and 2.1 parts of trichoderma.

The preparation method of the cohesive soil conditioner comprises the following steps:

(1) crushing oil cakes, straws, dry branches and fallen leaves in the organic biological fertilizer into 2-3cm in diameter and uniformly mixing to obtain a biological fertilizer mixture;

(2) uniformly mixing fine sand, zeolite, brown coal powder and expanded graphite powder in the solid additive material to obtain a solid additive mixture, and separately packaging triterpenoid saponin and sodium lignosulfonate;

(3) uniformly mixing aspergillus flavus, streptomyces griseus, bacillus subtilis and trichoderma in the compound microbial agent to obtain a microbial agent mixture;

(4) and respectively packaging the bio-fertilizer mixture, the solid addition mixture and the microbial inoculum mixture.

Example 5:

the cohesive soil conditioner of the embodiment comprises: according to the parts by weight, 1000 parts of solid additive material, 550 parts of organic bio-fertilizer and 70 parts of compound microbial agent;

wherein, the solid additive material comprises: 120 parts of fine sand, 90 parts of zeolite, 40 parts of lignite powder, 20 parts of expanded graphite powder, 2 parts of triterpenoid saponin and 2 parts of sodium lignosulfonate.

The organic biological fertilizer comprises: 60 parts of oil cake, 50 parts of straw, 40 parts of dead branches and 30 parts of fallen leaves.

The compound microbial agent comprises: 7 parts of aspergillus flavus, 1.5 parts of streptomyces griseus, 1 part of bacillus subtilis and 2.5 parts of trichoderma.

The preparation method of the cohesive soil conditioner comprises the following steps:

(1) crushing oil cakes, straws, dry branches and fallen leaves in the organic biological fertilizer into 2-3cm in diameter and uniformly mixing to obtain a biological fertilizer mixture;

(2) uniformly mixing fine sand, zeolite, brown coal powder and expanded graphite powder in the solid additive material to obtain a solid additive mixture, and separately packaging triterpenoid saponin and sodium lignosulfonate;

(3) uniformly mixing aspergillus flavus, streptomyces griseus, bacillus subtilis and trichoderma in the compound microbial agent to obtain a microbial agent mixture;

(4) and respectively packaging the bio-fertilizer mixture, the solid addition mixture and the microbial inoculum mixture.

Example 6

The method for improving the cohesive soil in the embodiment adopts the cohesive soil conditioner prepared in the embodiment 1, the addition amount of the cohesive soil conditioner is 10 wt% of the mass of the cohesive soil, and the method comprises the following steps:

(1) adding quicklime into the cohesive soil, wherein the addition amount of the quicklime is 0.5 percent of the mass of the cohesive soil, and adjusting the pH value of the cohesive soil to be 7; crushing the viscous soil after the viscous soil is dried;

(2) adding the solid additive materials except the triterpenoid saponin and the sodium lignosulfonate into the crushed viscous soil, uniformly mixing, and adding water for first maintenance; wherein, the first curing condition is as follows: the amount of the added water is 15 percent of the mass of the cohesive soil, and the curing time is 2 days

(3) Uniformly mixing the organic bio-fertilizer and the compound microbial agent, and adding the residual triterpenoid saponin and sodium lignosulfonate in the solid additive material for uniformly mixing to obtain a repairing material;

(4) and after the first curing is finished, adding part of the repairing material into the soil, uniformly mixing, covering the residual repairing material on the surface of the viscous soil, and performing second curing for 25 days when the thickness of the repairing material covered by the viscous soil is 3 cm.

Example 7

The method for improving the cohesive soil in the embodiment adopts the cohesive soil conditioner prepared in the embodiment 3, the addition amount of the cohesive soil conditioner is 11 wt% of the mass of the cohesive soil, and the method comprises the following steps:

(1) adding quicklime into the cohesive soil, wherein the addition amount of the quicklime is 1% of the mass of the cohesive soil, and adjusting the pH of the cohesive soil to be 8; crushing the viscous soil after the viscous soil is dried;

(2) adding the solid additive materials except the triterpenoid saponin and the sodium lignosulfonate into the crushed viscous soil, uniformly mixing, and adding water for first maintenance; wherein, the first curing condition is as follows: the amount of the added water is 17 percent of the mass of the cohesive soil, and the curing time is 3 days

(3) Uniformly mixing the organic bio-fertilizer and the compound microbial agent, and adding the residual triterpenoid saponin and sodium lignosulfonate in the solid additive material for uniformly mixing to obtain a repairing material;

(4) and after the first curing is finished, adding part of the repairing material into the soil, uniformly mixing, covering the residual repairing material on the surface of the viscous soil, and curing for 20 days for the second time when the thickness of the repairing material covered by the viscous soil is 3-7 cm.

Example 8

The method for improving the cohesive soil in the embodiment adopts the cohesive soil conditioner prepared in the embodiment 5, the addition amount of the cohesive soil conditioner is 2 wt% of the mass of the cohesive soil, and the method comprises the following steps:

(1) adding quicklime into the cohesive soil, wherein the addition amount of the quicklime is 1.5% of the mass of the cohesive soil, and adjusting the pH of the cohesive soil to 7-8; crushing the viscous soil after the viscous soil is dried;

(2) adding the solid additive materials except the triterpenoid saponin and the sodium lignosulfonate into the crushed viscous soil, uniformly mixing, and adding water for first maintenance; wherein, the first curing condition is as follows: the amount of the added water is 20 percent of the mass of the cohesive soil, and the maintenance time is 3 days

(3) Uniformly mixing the organic bio-fertilizer and the compound microbial agent, and adding the residual triterpenoid saponin and sodium lignosulfonate in the solid additive material for uniformly mixing to obtain a repairing material;

(4) and after the first curing is finished, adding part of the repairing material into the soil, uniformly mixing, covering the residual repairing material on the surface of the viscous soil, and curing for 25 days for the second time when the thickness of the repairing material covered by the viscous soil is 3-7 cm.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.