A soil stabilizer, its usage method and application

Abstract

The present invention discloses a soil solidifying agent and its using method and application. The soil solidifying agent provided by the present invention comprises components in the following mass percentages: 30-60% of component one, 20-40% of component two, 5-15% of component three, and 5-15% of component four. Among them, component one is a gelling material, component two is industrial waste residue, component three is an activator, and component four is cement. The main components after the combination of component one and component two include at least two of calcium oxide, calcium silicate, aluminum oxide, and silicon dioxide. Using the soil solidifying agent provided by the present invention to solidify silty loess can reduce the internal pores of the soil body, improve the strength of the silty loess itself, and reduce the infiltration coefficient. While solving the industrial waste residue on the spot, the cost is reduced, enabling the industrial waste residue to be recycled, which is an environmentally friendly and sustainable green material.

Description

Technical Field

[0001] The present invention belongs to the technical field of soil solidifying agents, and specifically relates to a soil solidifying agent, a using method thereof, and an application thereof. Background Art

[0002] Soil, as a natural resource on which human survival and development depend, has always received continuous attention. As a special geological body, loess is the best carrier for recording the global natural environment, climate change, and the evolution of surface disasters since the late Neogene. Loess is a special soil widely distributed in arid and semi-arid regions in the northwest of China. The mineral composition of loess is complex, mainly quartz, feldspar, and a small amount of clay minerals such as illite. The chemical composition is mainly SiO 2 (content > 50%), and there are also small amounts of Al 2 O 3 , CaO, and Fe 2 O 3 . Natural loess is yellow, brownish-yellow, or yellowish-brown. Its particle composition is mainly silt particles, with large pores visible to the naked eye, well-developed vertical joints, poor cementation, and a metastable overhead skeleton composed of a large number of fine particles and salt crystals, making loess have an extremely high risk of disaster under external forces, showing poor engineering properties such as high compressibility, collapsibility, and reduced wetting strength. At the same time, loess is one of the common and main engineering building materials in the loess plateau area, but there is a lack of hard rock as the foundation and building material aggregate. The engineering construction not only has extremely high costs, but also abnormal development of bad geological phenomena and disasters such as foundation settlement, collapse, sliding deformation, soil erosion, and water and soil loss caused by the disaster characteristics of loess itself pose a serious threat to engineering safety. Therefore, aiming at the characteristics of rich loess materials and lack of hard aggregates in the loess area, in line with the concept of adapting to local conditions and turning waste into treasure, developing a suitable solidifying material for loess to modify it into a high-strength and low-permeability material can not only prevent soil erosion and engineering disaster prevention and control problems in the loess area, but also solve the problem of shortage of building materials, and has significant and wide application value. However, the main defects of the current soil solidifying agents for solidifying loess are high transportation and production costs, not prominent in improving strength, and prone to frost heaving and durability problems in environments with large temperature differences and climate differences. On the other hand, the digestion and secondary utilization of industrial waste residues in most areas have also become key issues.

[0003] Based on this, the present invention is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a soil solidifying agent, a using method thereof, and an application thereof to overcome the defects existing in the above-mentioned prior art.

[0005] The present invention solves its technical problems by adopting the following technical solutions.

[0006] The present invention provides a soil stabilizer, which comprises components in the following mass percentages: Component One: 30 - 60%, Component Two: 20 - 40%, Component Three: 5 - 15%, Component Four: 5 - 15%. Among them, Component One is a gelling material, Component Two is industrial waste residue, Component Three is an activator, and Component Four is cement. The main components after the combination of Component One and Component Two include at least two of calcium oxide, calcium silicate, aluminum oxide, and silicon dioxide.

[0007] The present invention also provides a method for using the above soil stabilizer, which includes: incorporating the soil stabilizer into the soil to be solidified, adding water, stirring evenly, and standing still, and obtaining the reinforced loess after ramming and compacting; wherein, the incorporation amount of the soil stabilizer is 1 - 15% of the mass of the soil to be solidified.

[0008] The present invention also provides an application of the above silty loess stabilizer in constructing a check dam in a silty loess area. The soil stabilizer is used for mixing and reinforcing on the water-facing side and the middle part of the dam body of the check dam. An overflow trough is excavated in the middle part of the dam body of the reinforced check dam, and a water collecting pool is designed below the overflow trough, so that the surface water upstream of the check dam can be efficiently discharged downstream.

[0009] The present invention has the following beneficial effects:

[0010] The present invention provides a soil stabilizer, its using method and application. Using the soil stabilizer provided by the present invention to solidify the silty loess can solve the industrial waste on the spot, improve the strength of the loess itself and reduce the infiltration coefficient, solve the problems of low strength and collapsibility of the loess, and be used for the reinforcement of the check dam. It can not only resist the scouring and erosion of surface water flow, but also remain intact, and at the same time has a wide engineering application prospect. Description of the Drawings

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0012] Figure 1 It is an electron microscope image of pure loess scanned at 1000 times;

[0013] Figure 2 It is an electron microscope image of the reinforced loess scanned at 500 times;

[0014] Figure 3 It is an electron microscope image of the reinforced loess scanned at 5000 times;

[0015] Figure 4For the unconfined compressive strength test under different curing periods;

[0016] Figure 5 For the curves of the permeability coefficients of pure loess and reinforced loess with different examples varying with time;

[0017] Figure 6 For the results of the freeze-thaw cycle experiment;

[0018] Figure 7 For the curve of the unconfined compressive strength of the reinforced loess with only Component 1 added varying with time;

[0019] Figure 8 For the curve of the unconfined compressive strength of the reinforced loess with only Component 2 added varying with time;

[0020] Figure 9 For the curve of the unconfined compressive strength of the reinforced loess with only Component 3 added varying with time;

[0021] Figure 10 For the curve of the unconfined compressive strength of the reinforced loess with only Component 4 added varying with time;

[0022] Figure 11 For the schematic diagram of the design model of the application example of the present invention;

[0023] Figure 12 For the comparison of the appearance of the check dam before and after repair before rainfall. The left figure shows the appearance of the check dam before repair, and the right figure shows the appearance of the check dam after repair;

[0024] Figure 13 For the appearance of the reinforced check dam after heavy rainfall;

[0025] Figure 14 For the comparison of the appearance of the repaired and unrepaired check dams in the same gully after heavy rainfall. Detailed implementation manners

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. For those not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. For reagents or instruments not specified by the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0027] The following specifically describes a soil stabilizer provided by the present invention, its usage method, and its application:

[0028] In a first aspect, an embodiment of the present invention provides a soil stabilizer, which comprises components in the following mass percentages: Component One: 30 - 60%, Component Two: 20 - 40%, Component Three: 5 - 15%, Component Four: 5 - 15%. Among them, Component One is a gelling material, Component Two is industrial waste residue, Component Three is an activator, and Component Four is cement. The main components after the combination of Component One and Component Two include at least two of calcium oxide, calcium silicate, aluminum oxide, and silicon dioxide.

[0029] For the soil stabilizer provided by the embodiment of the present invention, Component One mainly provides active oxides and forms a gel under the action of hydration reaction; Component Two mainly activates the activity of the remaining components through potential hydraulic gelling properties, etc., so that the reaction continues to occur and the structure is stable; Component Three mainly plays a catalytic role, enabling the material to maintain activity while accelerating the reaction; Component Four serves as a support for early strength and also provides more C - S bonds for subsequent reactions. The above - provided soil stabilizer, under the synergistic action of multiple components, enables the reinforced soil body to be cured quickly and stably, fills the internal pores of the soil body, thereby achieving the effects of increased strength and stable structure.

[0030] In an alternative embodiment, the main components after the combination of Component One and Component Two include at least two of calcium oxide, calcium silicate, aluminum oxide, and silicon dioxide, and the activity index is higher than 55%.

[0031] In an alternative embodiment, Component One includes at least one of fly ash, coal gangue, gypsum, and lime, and Component Two includes at least one of blast furnace slag, slag, carbon slag, and steel slag;

[0032] Preferably, the fly ash is ground from Class F fly ash above Grade II, and the fineness is above 800 mesh.

[0033] In an alternative embodiment, Component Three includes at least one of magnesium chloride, magnesium oxide, sodium chloride, sodium hydroxide, sodium silicate, and calcium fluoride.

[0034] In an alternative embodiment, Component Four includes at least one of portland cement, ordinary portland cement, or fly ash composite portland cement;

[0035] Preferably, the strength of the cement is 42.5 MPa.

[0036] In a second aspect, an embodiment of the present invention further provides a method for using the above - mentioned soil stabilizer, which includes: incorporating the soil stabilizer into the soil to be cured, adding water, stirring evenly, and standing still, and obtaining the cured soil after ramming and compacting; wherein, the incorporation amount of the soil stabilizer is 1 - 15% of the mass of the soil to be cured.

[0037] In an alternative embodiment, the water content of the cured soil is 10 - 20%.

[0038] In an alternative embodiment, the soil to be solidified includes one or more of sandy loess, silty loess, and clayey loess, preferably silty loess.

[0039] In a third aspect, an embodiment of the present invention further provides an application of the above-mentioned silty loess solidifying agent in constructing a check dam in a silty loess area. The soil solidifying agent is used for mixing and reinforcing the upstream face and the middle part of the dam body of the check dam. An overflow chute is excavated in the middle part of the dam body of the reinforced check dam, and a catch basin is designed below the overflow chute, so that the surface water upstream of the check dam can be efficiently discharged downstream.

[0040] In an alternative embodiment, the use of the soil solidifying agent for mixing and reinforcing the upstream face and the middle part of the dam body of the check dam includes: adding the soil solidifying agent into the soil on the upstream face and in the middle part of the dam body of the check dam, adding water and stirring evenly, and then ramming and compacting.

[0041] The present invention will be further described below with reference to embodiments.

[0042] The soil used in the following examples and comparative examples is silty loess, which is from Ganguyi Town, Baota District, Yan'an City.

[0043] The moisture content of the solidified loess refers to the percentage of water in the total mass of the soil solidifying agent and the silty loess.

[0044] Example 1

[0045] A soil solidifying agent includes the following components by mass percentage:

[0046] Component 1: Fly ash 27%, coal gangue 23%

[0047] Component 2: Blast furnace slag 35%

[0048] Component 3: Magnesium oxide 3%, sodium silicate 5%

[0049] Component 4: Portland cement 7%.

[0050] The usage method of the above soil solidifying agent includes: adding the soil solidifying agent into the silty loess at a dosage of 5%, then adding water and stirring evenly and standing still, and obtaining solidified loess with a moisture content of 17% after ramming and compacting.

[0051] Example 2

[0052] A soil solidifying agent includes the following components by mass percentage:

[0053] Component 1: Fly ash 37%, gypsum 14%

[0054] Component 2: Blast furnace slag 23%, slag 14%

[0055] Component 3: Calcium fluoride 5%, sodium hydroxide 2%

[0056] Component Four: Fly ash composite Portland cement 5%.

[0057] The usage method of the above soil stabilizer includes: incorporating the soil stabilizer into silty loess at a dosage of 5%, then adding water and stirring evenly, standing still, and obtaining the reinforced loess with a water content of 17% after ramming and compacting.

[0058] Example 3

[0059] A soil stabilizer includes the following components by mass percentage:

[0060] Component One: Coal gangue 24%, lime 20%

[0061] Component Two: Carbon slag 15%, slag 25%

[0062] Component Three: Magnesium chloride 5%, sodium chloride 2%

[0063] Component Four: Ordinary Portland cement 9%.

[0064] The usage method of the above soil stabilizer includes: incorporating the soil stabilizer into silty loess at a dosage of 5%, then adding water and stirring evenly, standing still, and obtaining the reinforced loess with a water content of 17% after ramming and compacting.

[0065] Example 4

[0066] Similar to the composition of Example 2, the difference is only that fly ash is replaced by coal gangue.

[0067] Example 5

[0068] Similar to the composition of Example 2, the difference is only that blast furnace slag is replaced by steel slag.

[0069] Example 6

[0070] Similar to the composition of Example 2, the difference is only that sodium hydroxide is replaced by sodium chloride.

[0071] Example 7

[0072] Similar to the composition of Example 2, the difference is only that gypsum is not included and the proportion of fly ash is 51%.

[0073] Example 8

[0074] Similar to the composition of Example 2, the difference is only that slag is not included and the proportion of blast furnace slag is 37%.

[0075] Example 9

[0076] Similar to the composition of Example 2, the difference is only that sodium hydroxide is not included and the proportion of calcium fluoride is 7%.

[0077] Example 10

[0078] Similar to the composition of Example 2, except that the fly ash composite Portland cement is replaced with ordinary Portland cement.

[0079] Example 11

[0080] Similar to the composition of Example 2, except that the cement dosage is 7%, the calcium fluoride content is 4%, and the sodium hydroxide content is 1%.

[0081] Example 12

[0082] Similar to the composition of Example 2, except that the moisture content is increased to 20%.

[0083] Comparative Example 13

[0084] Similar to the composition of Example 2, except that the moisture content is reduced to 15%.

[0085] Comparative Example 1

[0086] Similar to the composition of Example 2, except that the calcium fluoride is replaced with calcium lignosulfonate.

[0087] Comparative Example 2

[0088] Similar to the composition of Example 2, except that the sodium hydroxide is replaced with sodium lignosulfonate.

[0089] Comparative Example 3

[0090] Similar to the composition of Example 2, except that the calcium fluoride is replaced with potassium persulfate.

[0091] Comparative Example 4

[0092] Similar to the composition of Example 2, except that the calcium fluoride is replaced with calcium sulfate.

[0093] Comparative Example 5

[0094] Similar to the composition of Example 2, except that the calcium fluoride and sodium hydroxide are replaced with calcium hydroxide.

[0095] Comparative Example 6

[0096] Similar to the composition of Example 2, except that the calcium fluoride is replaced with calcium chloride.

[0097] Comparative Example 7

[0098] Similar to the composition of Example 2, except that the sodium hydroxide is replaced with aluminum chloride.

[0099] Comparative Example 8

[0100] It is similar in composition to Example 2, except that sodium hydroxide is replaced by sodium sulfate.

[0101] The following table shows the test results of the compressive strength, anti-seepage coefficient and saturation time of the reinforced loess obtained from Examples 1-13 and Comparative Examples 1-8.

[0102]

[0103]

[0104] It can be seen from the test results in the above table that the compressive strength, anti-seepage coefficient and saturation time of the reinforced loess solidified with the soil stabilizer provided in Examples 1-13 of the present invention are improved at various curing ages. In particular, the various performance aspects of the reinforced loess solidified with the soil stabilizer provided in Example 2 are better. That is, the simultaneous addition of fly ash, gypsum, blast furnace slag, slag, calcium fluoride, sodium hydroxide and cement in the preparation of the soil stabilizer plays a synergistic role, making the compressive strength, anti-seepage coefficient and saturation time of the loess solidified by the soil stabilizer improved at various curing ages. This may be due to: fly ash contains active oxides such as SiO 2 , Al 2 O 3 , CaO, etc., and will undergo hydration under certain alkaline conditions. The active SiO 2 , active Al 2 O 3 and f-CaO (free calcium oxide) in fly ash are all beneficial components of activity and are beneficial to the formation of gel. At the same time, a small amount of MgO, Na 2 O, K 2 O, etc. generate more vitreous bodies, which will promote the alkali-silica reaction in the hydration reaction. The main chemical component of gypsum is calcium sulfate (CaSO 4 ), and soluble gypsum plays a certain role in the early strength development of fly ash and is also a setting retarder for portland cement. The blast furnace slag mainly contains oxides of calcium, silicon, aluminum, magnesium, iron and a small amount of sulfides, and has potential hydraulic cementing properties, which can stimulate the activity of materials such as cement and gypsum. The main chemical components of slag are CaO, SiO 2 , Al 2 O 3 , etc., and has weak hydraulicity. The blast furnace slag and slag can undergo a "secondary hydration reaction" with the hydration products (Ca(OH) 2 ) of cement, which can promote the continuous occurrence of the hydration reaction, generate more C-S-H gel, and make the Ca(OH) in the aggregate interface zone 2The grain size becomes smaller, improving the microstructure of the reinforced loess body, reducing the soil porosity, increasing the bonding force at the particle interface, and at the same time making the distribution of hydration products more uniform, enhancing the compactness of the structure, and greatly improving the physical and mechanical properties of the reinforced loess. Calcium fluoride can be used as a mineralizer to reduce fuel consumption, enhance the bonding between materials, and promote the formation of tricalcium silicate; while sodium hydroxide plays a catalytic role in cement hardening, making the silicon and aluminum compounds in the cement relatively easy to dissolve to form sodium silicate and sodium metaaluminate, which further react with Ca(OH) 2 , to form calcium silicate and calcium aluminate minerals, harden the cement and regenerate NaOH to catalyze the next round of reaction, forming an "alkali activation" to ensure the activity of the reaction and its continuous occurrence. When fly ash, gypsum, blast furnace slag, slag, calcium fluoride, sodium hydroxide, and cement are used together, a stable and cohesive gel is formed after the hydration of cement, fly ash, and gypsum, filling the internal voids of the soil. Under the action of the secondary hydration reaction of blast furnace slag and slag, more C-S-H gel is generated, making the inside of the soil particles uniform and dense. Under the activation of calcium fluoride and sodium hydroxide, the reaction continuously occurs in an alkaline environment, generating more products to fill smaller voids, thereby increasing the soil strength, improving the soil structure, enhancing the anti-seepage coefficient, and delaying the saturation time. The strength and permeability coefficient of the reinforced soil in Comparative Examples 1-8 were not optimized much. This is mainly because in an acidic environment, the reinforcement of loess is not as good as in an alkaline environment. In an alkaline environment, it is easier to increase the excitation ability of reactants, promote the reaction to proceed quickly and continuously, and is more conducive to soil reinforcement and reaction occurrence; at the same time, the additional addition of sulfate ions cannot significantly improve the soil strength, and instead, the strength growth rate decreases with the increase of the curing period; the addition of aluminum ions is not as effective as active metals such as magnesium ions, calcium ions, and sodium ions. The more active metal cations can make the reaction proceed faster and more persistently, resulting in a faster increase in strength and better effects.

[0105] Application Example

[0106] To verify the soil solidification effect of the soil solidifying agent of the present invention, the pure loess (silty loess) collected from Gutun Basin, Ganguyi Town, Baota District, Yan'an City, Shaanxi Province was solidified. The method for making the reinforced loess is as follows: Add the soil solidifying agent provided in Example 2 at a dosage of 5% to the silty loess. After mixing the soil evenly, add water to make the water content the optimum water content (17%), and then compact it into a cylinder with a height of 50 cm and a diameter of 50 cm, which is the reinforced loess. The overall properties of the pure loess and the reinforced loess were evaluated.

[0107] The SEM image of the pure loess scanned at 1000 times is shown in Figure 1 , and it can be seen from Figure 1 that the particles inside the silty loess are loose, with many pores and weak cementation.

[0108] Take a small fresh section from the reinforced loess and place it in the test chamber. The SEM images scanned at 500 times magnification are shown in Figure 2 , and the SEM images scanned at 5000 times magnification are shown in Figure 3 . From Figure 2 , it can be seen that the particles are compact, the internal pores are filled, and the particles are cemented and filled. Further, from Figure 3 , it can be seen that there are almost no visible pores in the reinforced loess, cementation occurs, and the particles are cemented and filled and connected.

[0109] The unconfined compressive strength tests of the reinforced loess under different curing periods are shown in Figure 4 . From Figure 4 , it can be seen that the unconfined compressive strength at 1 day is 1.65 MPa, the unconfined compressive strength at 7 days is 5.10 MPa, and the unconfined compressive strength at 28 days is 8.15 MPa.

[0110] Compact the pure loess and the reinforced loess into a mold in a ring cutter. The size of the ring cutter is 61.8 mm in diameter and 40 mm in height. The variable head test method is adopted to test the permeability coefficient. The curves of the permeability coefficient of the pure loess and the reinforced loess prepared with the soil curing agents provided in Examples 1-4 changing with time are shown in Figure 5 . From Figure 5 , it can be seen that the anti-seepage coefficient of the pure loess is 1×10 - 6 cm / s and reaches saturation in about 5 hours; the anti-seepage coefficients of the reinforced loess in Examples 1, 3, and 4 reach 1×10 -7 cm / s, and the saturation time is about 12 h; the anti-seepage coefficient of the reinforced loess in Example 2 reaches 1×10 -8 cm / s, and the saturation time is more than 48 h, delaying the saturation time by more than eight times.

[0111] Put the reinforced loess into the freeze-thaw cycle machine for testing. The results of the freeze-thaw cycle experiment are shown in Figure 6 . From Figure 6 , it can be seen that the freeze-thaw cycle is water freezing and water melting, -20°C - 20°C, 12 h for one wet-dry cycle, and after 10 consecutive cycles, the average mass loss is 1.53%, and the maximum mass loss is 2.0%. At the same time, the strength loss is about 0 - 3%. Under the freeze-thaw cycle, the reinforced loess specimen has almost no mass and strength loss.

[0112] Figure 7 is the curve of the unconfined compressive strength of the reinforced loess with only component one coal gangue added changing with time at different dosages; Figure 8 is the curve of the unconfined compressive strength of the reinforced loess with only component two blast furnace slag added changing with time at different dosages; Figure 9Curves showing the variation of the unconfined compressive strength of reinforced loess with time when only adding component calcium fluoride at different dosages; Figure 10 Curves showing the variation of the unconfined compressive strength of reinforced loess with time when only adding component four fly ash composite Portland cement at different dosages. It can be seen from Figures 7 - 10 this that the effect of adding any one material alone at the same dosage is far less than that of adding multiple materials in combination.

[0113] Figure 11 Schematic diagram of the model for the application example of the present invention. Figure 12 Comparison of the appearance of the check dam before and after repair. The left figure shows the appearance of the check dam before repair, and the right figure shows the appearance of the check dam after repair. Figure 13 Appearance of the reinforced check dam after heavy rainfall. It can be seen that: the check dam solidified by the soil stabilizer is well-preserved after heavy rainfall and is not washed away. Further, it can be seen from Figure 13 this that rainwater flows into the downstream cultivated land through the overflow trough in the middle of the check dam body, which is more conducive to the growth of crops.

[0114] Figure 14 Orthophoto images and photos of unmanned aerial vehicle photogrammetry. It can be seen that: in the same gully, three check dams are arranged at equal intervals along the water flow direction, numbered 5#, 4#, and 3# respectively. After heavy rainfall, the two upstream check dams 5# and 4# are successively washed open by the flood, and the crops are severely damaged by water. The reinforced check dam 3# remains intact. The surface water is efficiently discharged after collection, reducing the scour of the downstream cultivated land and ensuring the integrity of the downstream check dam and crops. It proves that the solidifying agent provided by the embodiment of the present invention has good application prospects.

[0115] In summary, the present invention provides a soil stabilizer and its use method and application. The present invention provides a soil stabilizer, which includes the following components by mass percentage: component one 30-60%, component two 20-40%, component three 5-15%, component four 5-15%. Among them, component one is a gelling material, component two is an industrial waste residue, component three is an activator, and component four is cement. The main components after combining component one and component two include at least two of calcium oxide, calcium silicate, aluminum oxide, and silicon dioxide. The above soil stabilizer reduces the impact of cement use on carbon emissions by locally sourcing materials and adopting different solid waste materials according to local conditions. For every ton of cement produced, CO 2The total emissions are approximately 640 kg. The use of solid waste materials does not involve a high-energy-consuming and high-emission calcination process, and the carbon emissions are only 10-30% of those of cement. At the same time, it also solves the problem of the need for secondary digestion of industrial solid waste materials, with prominent low-carbon characteristics and being more beneficial to environmental protection. The unconfined compressive strength of the reinforced loess solidified by the soil stabilizer provided by the present invention can reach more than 8 MPa, and it can greatly improve the soil strength and increase the soil anti-seepage coefficient. While solving industrial waste on-site, it improves the strength of silty loess itself and reduces the infiltration coefficient, solving the weaknesses of low strength and collapsibility of silty loess. Moreover, the cost is controllable and the price is low. It has good application prospects.

[0116] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A soil solidifying agent suitable for silty loess, characterized in that: The following components are included in mass percentage: Component 1: fly ash 27%, coal gangue 23% Component 2: blast furnace slag 35% Component 3: Magnesium oxide 3%, sodium silicate 5% Component 4: Portland cement 7% The method for using the soil solidifier comprises: adding the soil solidifier into silty loess at a dosage of 5%, then adding water to stir evenly and letting it stand, and compacting to obtain reinforced loess with a moisture content of 17%.

2. A soil stabilizer suitable for silty loess, characterized in that: The following components are included in mass percentage: Component 1: fly ash 37%, gypsum 14% Component 2: blast furnace slag 23%, slag 14% Component 3: Calcium fluoride 5%, sodium hydroxide 2% Component 4: Fly ash composite silicate cement 5% The method for using the soil solidifier comprises: adding the soil solidifier into silty loess at a dosage of 5%, then adding water to stir evenly and letting it stand, and compacting to obtain reinforced loess with a moisture content of 17%.

3. A soil solidifying agent suitable for silty loess, characterized in that: The following components are included in mass percentage: Component 1: Gangue 24%, lime 20% Component 2: Carbon slag 15%, slag 25% Component 3: Magnesium chloride 5%, sodium chloride 2% Component 4: Ordinary Portland Cement 9% The method for using the soil solidifier comprises: adding the soil solidifier into silty loess at a dosage of 5%, then adding water to stir evenly and letting it stand, and compacting to obtain reinforced loess with a moisture content of 17%.

4. A soil solidifying agent suitable for silty loess, characterized in that: The following components are included in mass percentage: Component 1: coal gangue 37%, gypsum 14% Component 2: blast furnace slag 23%, slag 14% Component 3: Calcium fluoride 5%, sodium hydroxide 2% Component 4: Fly ash composite silicate cement 5% The method for using the soil solidifier comprises: adding the soil solidifier into silty loess at a dosage of 5%, then adding water to stir evenly and letting it stand, and compacting to obtain reinforced loess with a moisture content of 17%.

5. A soil solidifying agent suitable for silty loess, characterized in that: The following components are included in mass percentage: Component 1: fly ash 37%, gypsum 14% Component 2: Steel slag 23%, slag 14% Component 3: Calcium fluoride 5%, sodium hydroxide 2% Component 4: Fly ash composite silicate cement 5% The method for using the soil solidifier comprises: adding the soil solidifier into silty loess at a dosage of 5%, then adding water to stir evenly and letting it stand, and compacting to obtain reinforced loess with a moisture content of 17%.

6. A soil stabilizer suitable for silty loess, characterized in that: The following components are included in mass percentage: Component 1: fly ash 37%, gypsum 14% Component 2: blast furnace slag 23%, slag 14% Component 3: Calcium fluoride 5%, sodium chloride 2% Component 4: Fly ash composite silicate cement 5% The method for using the soil solidifier comprises: adding the soil solidifier into silty loess at a dosage of 5%, then adding water to stir evenly and letting it stand, and compacting to obtain reinforced loess with a moisture content of 17%.

7. A soil stabilizer suitable for silty loess, characterized in that: The following components are included in mass percentage: Component 1: Fly ash 51% Component 2: blast furnace slag 23%, slag 14% Component 3: Calcium fluoride 5%, sodium hydroxide 2% Component 4: Fly ash composite silicate cement 5% The method for using the soil solidifier comprises: adding the soil solidifier into silty loess at a dosage of 5%, then adding water to stir evenly and letting it stand, and compacting to obtain reinforced loess with a moisture content of 17%.

8. A soil stabilizer suitable for silty loess, characterized in that: The following components are included in mass percentage: Component 1: fly ash 37%, gypsum 14% Component 2: Blast furnace slag 37% Component 3: Calcium fluoride 5%, sodium hydroxide 2% Component 4: Fly ash composite silicate cement 5% The method for using the soil solidifier comprises: adding the soil solidifier into silty loess at a dosage of 5%, then adding water to stir evenly and letting it stand, and compacting to obtain reinforced loess with a moisture content of 17%.

9. A soil stabilizer suitable for silty loess, characterized in that: The following components are included in mass percentage: Component 1: fly ash 37%, gypsum 14% Component 2: blast furnace slag 23%, slag 14% Component 3: Calcium fluoride 7% Component 4: Fly ash composite silicate cement 5% The method for using the soil solidifier comprises: adding the soil solidifier into silty loess at a dosage of 5%, then adding water to stir evenly and letting it stand, and compacting to obtain reinforced loess with a moisture content of 17%.

10. A soil solidifying agent suitable for silty loess, characterized in that: The following components are included in mass percentage: Component 1: fly ash 37%, gypsum 14% Component 2: blast furnace slag 23%, slag 14% Component 3: Calcium fluoride 5%, sodium hydroxide 2% Component 4: Ordinary Portland Cement 5% The method for using the soil solidifier comprises: adding the soil solidifier into silty loess at a dosage of 5%, then adding water to stir evenly and letting it stand, and compacting to obtain reinforced loess with a moisture content of 17%.

11. A soil solidifying agent suitable for silty loess, characterized in that: The following components are included in mass percentage: Component 1: fly ash 37%, gypsum 14% Component 2: blast furnace slag 23%, slag 14% Component 3: Calcium fluoride 4%, sodium hydroxide 1% Component 4: Fly ash composite silicate cement 7% The method for using the soil solidifier comprises: adding the soil solidifier into silty loess at a dosage of 5%, then adding water to stir evenly and letting it stand, and compacting to obtain reinforced loess with a moisture content of 17%.

12. A soil solidifying agent suitable for silty loess, characterized in that: The following components are included in mass percentage: Component 1: fly ash 37%, gypsum 14% Component 2: blast furnace slag 23%, slag 14% Component 3: Calcium fluoride 5%, sodium hydroxide 2% Component 4: Fly ash composite silicate cement 5% The method for using the soil solidifier comprises: adding the soil solidifier into silty loess at a dosage of 5%, then adding water to stir evenly and letting it stand, and compacting it to obtain reinforced loess with a moisture content of 20%.

13. Use of the soil solidifying agent according to any one of claims 1 to 12 in constructing a silt dam in a silty loess area, characterized in that: The soil solidifier is used for mixing and reinforcement on the water-facing surface and the middle part of the dam body, an overflow trough is excavated in the middle part of the dam body of the reinforced dam, and a water collection tank is designed under the overflow trough, so that the surface water upstream of the dam can be efficiently discharged to the downstream.

14. The use according to claim 13, characterized in that The mixing and reinforcement of the soil solidifying agent on the water-facing surface and the middle part of the dam body comprises: adding the soil solidifying agent into the soil on the water-facing surface and the middle part of the dam body, adding water and stirring evenly, and then compacting and compacting.

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