Deep soft soil solidification process

Abstract

The invention discloses a deep soft soil curing process. The deep soft soil curing process comprises the following steps: S1, mixing and stirring a curing agent main agent, water and an additive to prepare a first slurry agent; s2, the first slurry agent is conveyed into the deep soft soil, the first slurry agent is firstly mixed with the exciting agent in the conveying process to prepare a second slurry agent, and then the second slurry agent is mixed with the water absorbent and then immediately conveyed into the deep soft soil; and S3, the water absorbent, the second slurry agent and the deep soft soil are mixed and stirred, and curing treatment of the deep soft soil is completed. By adopting the curing process, the problems of poor slurry flowability and the like caused by rapid reaction of the curing agent main agent and the exciting agent after mixing and condensation before injection into the soft soil layer can be avoided, and the curing process can be used for reinforcing the deep soft soil.

Description

Technical Field

[0001] The present invention relates to the technical field of soft soil foundation treatment, and more specifically, to a deep soft soil solidification process. Background Art

[0002] Deep silt and soft soil layers are widely distributed underground in the eastern coastal areas of my country, and foundation reinforcement is required to meet the use requirements. Cement mixing piles are widely used in deep soft soil reinforcement, and cement is generally used as a gelling agent for foundation reinforcement. However, cement is a high-energy consumption and high-carbon emission product. The production of 1 ton of cement produces an average of 0.8 tons of CO2; in addition, the production of cement also emits a large amount of SO2, powder layer and other pollutants.

[0003] In order to avoid environmental pollution caused by cement production and save resources, domestic and foreign scholars use industrial solid waste as the main raw material of curing agent, use stimulating materials to activate the activity of industrial solid waste, produce soft soil curing agent based on industrial solid waste, and use soft soil curing agent to solidify soft soil layer. Industrial solid waste soft soil curing agent is composed of curing agent main agent and stimulating material. After the stimulating material comes into contact with the curing agent main agent, the curing agent main agent will react chemically rapidly, resulting in increased viscosity of curing agent slurry, poor slurry fluidity, short initial setting time, and due to the limitation of construction machinery, the reinforcement depth of soft soil curing agent for soft soil generally does not exceed 5m. Therefore, the current application of industrial solid waste soft soil curing agent is mainly for shallow soft soil, or the soil body is improved ex situ and then used for shallow backfilling. It cannot be used for deep soft soil reinforcement, which greatly limits the application scope of industrial solid waste soft soil curing agent. Summary of the invention

[0004] Another object of the present invention is to provide a deep soft soil solidification process, which can avoid the problem of poor slurry fluidity caused by rapid reaction of the curing agent main agent and the activator after mixing, and coagulation before injection into the soft soil layer, and can be used for the reinforcement of deep soft soil.

[0005] In order to achieve these purposes and other advantages according to the present invention, a deep soft soil solidification process is provided, comprising the following steps: S1, mixing the curing agent main agent with water and additives to form a first slurry; S2, transporting the first slurry to the deep soft soil, the first slurry is first mixed with the activator to form the second slurry during the transportation process, and then mixed with the water absorbent and immediately transported to the deep soft soil; S3, mixing and stirring the water absorbent, the second slurry and the deep soft soil to complete the deep soft soil solidification treatment.

[0006] Preferably, in step S1, the mass ratio of the main curing agent to water is 1:0.6-1:1.2; the amount of the admixture is 1%-8% of the main curing agent; and the mixing time is 5 min-15 min.

[0007] Preferably, the curing agent main agent includes steel slag powder, granulated blast furnace slag, fly ash, desulfurized ash, phosphogypsum, and alkaline slag; the admixture includes triethanolamine, polycarboxylic acid water reducer, and molecular surfactant; the activator includes sodium hydroxide, sodium silicate, sodium sulfate, and lithium salt; the water absorbent is sodium polyacrylate SAP super absorbent resin; The mass ratio of the main curing agent to the activator is 1:0.15-1:0.35, the mass ratio of the main curing agent to the water absorbent is 1:0.05-1:0.25, and the mass content of the main curing agent in the soft soil is 5%-15%.

[0008] Preferably, the fineness of the steel slag powder of the main curing agent is 1-100 mesh, and the fineness of granulated blast furnace slag, fly ash, desulfurization ash, phosphogypsum, and alkali slag is 1-300 mesh; the sodium hydroxide of the activator is in flake or powder form with a purity of ≥92%; the sodium silicate and sodium sulfate are both in powder form with a purity of ≥90%; the lithium salt is one of lithium carbonate and lithium sulfate with a purity of ≥95%.

[0009] Preferably, the polycarboxylate water reducer is an ester-based sustained-release polycarboxylate high-efficiency water reducer; and the sodium polyacrylate SAP superabsorbent resin is in powder form.

[0010] Preferably, when the first slurry is mixed with the activator and the water absorbing agent, a mixing and conveying device is used for mixing, and the mixing and conveying device comprises: External pulping equipment, comprising a pulping tank, a first storage tank, a second storage tank, a third storage tank, a fourth storage tank, a first material conveyor, a second material conveyor, and a water tank, wherein the first storage tank is used to store the curing agent main agent, the second storage tank is used to store the additive, the first storage tank and the second storage tank are respectively connected to the pulping tank through the first material conveyor and the second material conveyor, a stirring shaft is provided in the pulping tank, the pulping tank is also connected to the water tank, and the pulping tank is used to prepare the first slurry; the third storage tank and the fourth storage tank are respectively used to store the activator and the water absorbent; A feeding device is connected with the slurry making tank through a slurry delivery hose, a first ash inlet and a second ash inlet are provided on the feeding device, the third storage tank and the fourth storage tank are respectively connected with the first ash inlet and the second ash inlet through a first hose and a second hose, the first slurry enters the feeding device through the slurry delivery hose and is sequentially mixed with an activator and a water absorbent and then transported to the deep soft soil.

[0011] Preferably, the feeding device is mounted on the digging arm of the mechanical equipment, and the feeding device comprises: A material conveying bucket is fixedly arranged at the end of the excavating arm of the mechanical equipment, a spiral shaft is installed in the material conveying bucket along its axial direction, a feed port is arranged at the top of the material conveying bucket, a discharge port is arranged at the bottom, the feed port is communicated with the slurry delivery hose, the first ash inlet and the second ash inlet are arranged on the side wall of the material conveying bucket, and the second ash inlet is arranged close to the discharge port; A stirring head is installed at the bottom of the material conveying barrel. A grouting pipe is embedded in the stirring head. The grouting pipe is connected to the discharge port. The second slurry and the water absorbent in the material conveying barrel are injected into the deep soft soil through the grouting pipe. The stirring head is used to stir the water absorbent, the second slurry and the deep soft soil.

[0012] Preferably, the discharge end of any hose is fixedly connected to the corresponding ash inlet, and a sliding assembly is installed at any ash inlet, and the sliding assembly includes: Two slide rails are symmetrically installed on both sides of the ash inlet, a cover plate is slidably arranged on the slide rail, an arc-shaped groove is opened on the top of the cover plate, the hose is located in the arc-shaped groove, and there is a gap between the inner side wall of the cover plate and the outer side wall of the material conveying barrel, which can be used to accommodate the hose; A wire take-up wheel is installed on the top of the material conveying cylinder, the wire take-up wheel is connected to the top of the cover plate through a steel wire rope, and the wire take-up wheel drives the cover plate to slide on the slide rail through the steel wire rope; Two return springs are symmetrically mounted on both sides of the top of the cover plate, one end of each return spring is connected to the cover plate, and the other end is connected to the outer wall of the material conveying barrel; When the reset spring is in an extended state, the inner wall of the arc groove contacts the outer wall of the hose, and the hose is connected to the ash inlet; when the wire rope is reeled in by the drive take-up wheel to squeeze the reset spring and drive the cover plate to move up, the inner wall of the arc groove squeezes the hose, and the hose is not connected to the ash inlet.

[0013] Preferably, the distance between the first ash inlet and the discharge port is 0.4-0.6 m.

[0014] The present invention includes at least the following beneficial effects: based on the characteristics of the curing agent main agent, the present invention, on the one hand, first mixes the curing agent main agent with water and an admixture to form a first slurry, uses the admixture to increase the fluidity of the curing agent main agent, and prolongs the initial setting time of the slurry after the subsequent curing agent main agent is mixed with an activator; on the other hand, first transports the first slurry, mixes it with the activator during the transportation process, and then uses the extended initial setting time to provide time for the second slurry to be injected into the deep soft soil, thereby avoiding coagulation of the curing agent main agent and the activator before mixing and injecting, so that the curing agent main agent and the activator can be used for the curing treatment of the deep soft soil.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the arrangement structure of an external pulping device according to one embodiment of the present invention; Figure 2 It is a structural schematic diagram of the feeding device of the present invention; Figure 3 It is a schematic diagram of the structure of the cover plate and the return spring of the present invention; Figure 4 It is a schematic diagram of the installation position of the feeding device of the present invention; 1. Mechanical equipment, 101. Excavating arm, 2. External pulping equipment, 201. Pulping tank, 202. First storage tank, 203. Second storage tank, 204. Third storage tank, 205. Fourth storage tank, 206. First material conveyor, 207. Second material conveyor, 208. Water tank, 209. Agitator shaft, 2010. Slurry hose, 2011. First hose, 2012. Second hose, 3. Feeding device, 301. Material conveying barrel, 302. Screw shaft, 303. First ash inlet, 304. Second ash inlet, 305. Agitator head, 306. Feeding port, 4. Cover plate, 401. Arc groove, 402. Take-up wheel, 403. Wire rope, 404. Return spring. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0018] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] like Figure 1-4 As shown, the present invention provides a deep soft soil solidification process, comprising the following steps: S1. Mix the curing agent main agent with water and admixture to form the first slurry; the mass ratio of the curing agent main agent to water is 1:0.6~1:1.2; the amount of the admixture is 1%~8% of the curing agent main agent; the mixing time is 5min~15min; S2, transporting the first slurry to the deep soft soil, the first slurry is first mixed with the activator to form the second slurry during the transportation process, and then mixed with the water absorbent and immediately transported to the deep soft soil; S3, mixing and stirring the water absorbent, the second slurry and the deep soft soil to complete the deep soft soil solidification treatment.

[0020] In the above technical scheme, based on the characteristics of the curing agent main agent, the present invention first mixes the curing agent main agent with water and an admixture to form a first slurry. The admixture can increase the fluidity of the curing agent main agent and increase the initial setting time of the slurry after the curing agent main agent is mixed with the activator. In the process of being transported to the deep soft soil, the first slurry is first mixed evenly with the activator to form a second slurry. Since the admixture added to the first slurry can prolong the initial setting time of the slurry after the curing agent main agent is mixed with the activator, the second slurry will not coagulate immediately. The extended initial setting time of the second slurry is used to provide time for the second slurry to be injected into the deep soft soil. After the second slurry is mixed with the water reducer, it is immediately injected into the deep soft soil, thereby achieving the solidification effect on the deep soft soil. On the one hand, the present invention first mixes the curing agent main agent with the water reducer. On the one hand, the first slurry is transported first, mixed with the activator during the transportation process, and then the second slurry is mixed with the water absorbent and immediately injected into the deep soft soil using the extended initial setting time. Compared with the process of first mixing the curing agent main agent and the activator and then transporting the mixed slurry to the soft soil, the curing process of the present invention can avoid the rapid reaction of the curing agent main agent and the activator after mixing, and coagulation before injection, resulting in poor slurry fluidity and inability to be used for reinforcement of deep soft soil; the addition of the activator causes the curing agent main agent to produce a hydration reaction, which can effectively reinforce the strength of the deep soft soil, and the water absorbent can effectively reduce the moisture content of the deep soft soil to further increase the strength of the cured soil.

[0021] In another technical solution, the curing agent main agent includes steel slag powder, granulated blast furnace slag, fly ash, desulfurized ash, phosphogypsum, and alkaline slag; the admixture includes triethanolamine, polycarboxylic acid water reducer, and molecular surfactant; the activator includes sodium hydroxide, sodium silicate, sodium sulfate, and lithium salt; the water absorbent is sodium polyacrylate SAP super absorbent resin; The mass ratio of the main curing agent to the activator is 1:0.15-1:0.35, the mass ratio of the main curing agent to the water absorbent is 1:0.05-1:0.25, and the mass content of the main curing agent in the soft soil is 5%-15%.

[0022] In another technical solution, the fineness of the steel slag powder of the main curing agent is 1-100 mesh, and the fineness of the granulated blast furnace slag, fly ash, desulfurization ash, phosphogypsum, and alkali slag is 1-300 mesh; the sodium hydroxide of the activator is in flake or powder form with a purity of ≥92%; the sodium silicate and sodium sulfate are both in powder form with a purity of ≥90%; the lithium salt is one of lithium carbonate and lithium sulfate with a purity of ≥95%.

[0023] In another technical solution, the polycarboxylate water reducer is an ester-based sustained-release polycarboxylate high-efficiency water reducer; and the sodium polyacrylate SAP superabsorbent resin is in powder form.

[0024] In the present technical scheme, the ester-based slow-release polycarboxylate high-efficiency water reducer is synthesized by free radical polymerization at 40°C using triethyl citrate, isopentanol polyoxyethylene ether (TPEG) and acrylic acid as raw materials. The molecular surfactant is a new anionic surfactant, which is a linear polymer. The salt of sulfonated melamine formaldehyde condensate and sulfonated naphthalene formaldehyde condensate are the two main polymers used. Adding this additive to the admixture can reduce water by 15% to 30%, thereby reducing the amount of water added in the first slurry and improving the construction performance. The water absorption rate of powdered sodium polyacrylate SAP super absorbent resin in pure water is not less than 500 times its own weight. Therefore, the use of powdered sodium polyacrylate SAP super absorbent resin as the water absorbent can ensure that it can effectively reduce the moisture content of deep soft soil and ensure the strengthening effect on the strength of solidified soil.

[0025] In another technical solution, when the first slurry is mixed with the activator and the water absorbing agent, a mixing and conveying device is used for mixing, and the mixing and conveying device includes: The external pulping equipment 2 comprises a pulping tank 201, a first storage tank 202, a second storage tank 203, a third storage tank 204, a fourth storage tank 205, a first material conveyor 206, a second material conveyor 207, and a water tank 208. The first storage tank 202 is used to store the curing agent main agent, and the second storage tank 203 is used to store the additive. The first storage tank 202 and the second storage tank 203 are respectively connected to the pulping tank 201 through the first material conveyor 206 and the second material conveyor 207. The pulping tank 201 is provided with a stirring shaft 209. The pulping tank 201 is also connected to the water tank 208. The pulping tank 201 is used to prepare the first slurry; the third storage tank 204 and the fourth storage tank 205 are respectively used to store the activator and the water absorbent; The feeding device 3 is connected with the pulping tank 201 through a slurry delivery hose 2010. A first ash inlet 303 and a second ash inlet 304 are provided on the feeding device 3. The third storage tank 204 and the fourth storage tank 205 are connected with the first ash inlet 303 and the second ash inlet 304 respectively through a first hose 2011 and a second hose 2012. The first slurry enters the feeding device 3 through the slurry delivery hose 2010 and is then mixed with an activator and a water absorbent in turn and then transported to the deep soft soil.

[0026] In this technical solution, if Figure 1As shown, the external pulping equipment 2 is used to prepare the first slurry and to store the activator and the water absorbent. The curing agent main agent stored in the first storage tank 202, the additive stored in the second storage tank 203, and the water stored in the water tank 208 are sequentially fed into the pulping tank 201 through the first material conveyor 206 and the second material conveyor 207 and the water pipe according to the ratio. The first slurry is mixed and stirred in the pulping tank 201 to obtain the first slurry. The first slurry enters the feeding device 3 through the slurry conveying hose 2010. The feeding device 3 The device 3 is also connected to the third storage tank 204 and the fourth storage tank 205 through the first hose 2011 and the second hose 2012. The activator stored in the third storage tank 204 and the water absorbent stored in the fourth storage tank 205 can be respectively put into the feeding device 3 through the first hose 2011 and the second hose 2012; the first slurry is first transported to the feeding device 3, and then the timing of transporting the activator and the water absorbent to the feeding device 3 is controlled to achieve the purpose of mixing the first slurry with the activator and the water absorbent in sequence.

[0027] In another technical solution, the feeding device 3 is installed on the digging arm 101 of the mechanical equipment 1, and the feeding device 3 includes: A material conveying barrel 301 is fixedly arranged at the end of the excavating arm 101 of the mechanical equipment 1, a spiral shaft 302 is installed in the material conveying barrel 301 along its axial direction, a feed port 306 is provided at the top of the material conveying barrel 301, and a discharge port is provided at the bottom, the feed port 306 is communicated with the slurry conveying hose 2010, the first ash inlet 303 and the second ash inlet 304 are provided on the side wall of the material conveying barrel 301, and the second ash inlet 304 is provided close to the discharge port; The stirring head 305 is installed at the bottom of the material conveying barrel 301. A grouting pipe is embedded in the stirring head 305. The grouting pipe is connected to the discharge port. The second slurry and water absorbent in the material conveying barrel 301 are injected into the deep soft soil through the grouting pipe. The stirring head 305 is used to stir the water absorbent, the second slurry and the deep soft soil.

[0028] In this technical solution, if Figure 2 , Figure 4As shown, the feeding device 3 is composed of a material conveying barrel 301 and a screw shaft 302. The material conveying barrel 301 is installed at the end of the excavating arm 101 of the mechanical equipment 1, and the screw shaft 302 is installed inside the material conveying barrel 301, and is used to transport and mix the material entering the material conveying barrel 301. The screw shaft 302 is driven to rotate by a motor, and the connecting part between the excavating arm 101 of the mechanical equipment 1 and the material conveying barrel 301 has a mounting groove for accommodating the motor; the first slurry is transported to the deep soft soil through the slurry hose 2010 and the feeding device 3, and in the process of transportation, it is mixed with the activator and the water absorbent in turn. Specifically: the first slurry enters the material conveying barrel 301 through the slurry hose 2010 and the feed port 306, and is transported toward the discharge port through the screw shaft 302. During the transportation, the activator enters the material conveying barrel 301 through the first hose 2011 and is mixed and stirred with the first slurry A second slurry is made, and the second slurry is continuously transported under the action of the spiral shaft 302. During the transportation process, the water absorbent enters the material conveying barrel 301 through the second hose 2012 and is mixed with the second slurry, and then enters the grouting pipe through the discharge port, and is injected into the deep soft soil through the grouting pipe. At the same time, the stirring head 305 at the bottom of the material conveying barrel 301 stirs it with the deep soft soil, thereby achieving the solidification effect of the deep soft soil; the spiral shaft 302 conveys materials in the same way as the working principle of the spiral conveyor; the feeding device 3 of the present invention is installed on the excavation arm 101 of the mechanical equipment 1, and the existing equipment on the construction site can be used to improve it, so that the equipment can be applied to the solidification of deep soft soil without the need for additional new equipment, and the equipment cost is low; in order to avoid the shaking of the slurry hose 2010, the first hose 2011 and the second hose 2012 during the construction process to interfere with the construction, they can be tied to the excavation arm 101 through fixings.

[0029] In another technical solution, the discharge end of any hose is fixedly connected to the corresponding ash inlet, and a sliding assembly is installed at any ash inlet, and the sliding assembly includes: Two slide rails are symmetrically installed on both sides of the ash inlet, and a cover plate 4 is slidably arranged on the slide rails. An arc groove 401 is opened on the top of the cover plate 4, and the hose is located in the arc groove 401. There is a gap between the inner wall of the cover plate 4 and the outer wall of the material conveying barrel 301, which can be used to accommodate the hose; A wire take-up wheel 402 is installed on the top of the material conveying cylinder. The wire take-up wheel 402 is connected to the top of the cover plate 4 through a steel wire rope 403. The wire take-up wheel 402 drives the cover plate 4 to slide on the slide rail through the steel wire rope 403. Two return springs 404 are symmetrically mounted on both sides of the top of the cover plate 4, one end of each return spring 404 is connected to the cover plate 4, and the other end is connected to the outer wall of the material conveying barrel 301; When the reset spring 404 is in an extended state, the inner wall of the arc groove 401 contacts the outer wall of the hose, and the hose is connected to the ash inlet; when the driving take-up wheel 402 reels in the wire rope 403 to squeeze the reset spring 404 to drive the cover plate 4 to move upward, the inner wall of the arc groove 401 squeezes the hose, and the hose is not connected to the ash inlet.

[0030] In the present technical solution, a sliding assembly is installed at any ash inlet, and the sliding assembly is used to realize the closing and opening of the ash inlet, so as to control the timing of adding the activator and the water absorbent into the material conveying barrel 301. Specifically: in the initial state, the wire rope 403 on any take-up wheel 402 is in a tightened state, at which time the return spring 404 is compressed, and the arc groove 401 on the cover plate 4 squeezes the hose, and the discharge end of the hose is squeezed into the gap between the cover plate 4 and the material conveying barrel 301. The first ash inlet 303 and the second inlet The ash ports 304 are all in a closed state, the first slurry is transported to the material conveying barrel 301 through the slurry delivery hose 2010 and the feed port 306, and is transported toward the discharge port through the spiral shaft 302. When it is transported to the vicinity of the first ash inlet 303, the corresponding take-up wheel 402 is controlled to relax the wire rope 403, and the return spring 404 is in an extended state. Under the action of the return spring 404, the cover plate 4 moves down to the inner side wall of the arc groove 401 and contacts the first hose 2011 but does not squeeze the first hose 2011. Figure 3As shown, at this time, the first ash inlet 303 is connected with the discharge end of the first hose 2011, the activator enters the material conveying barrel 301 through the first hose 2011 and the first ash inlet 303, and is stirred and mixed with the first slurry through the spiral shaft 302 to form the second slurry, and the second slurry continues to be conveyed through the spiral shaft 302. When it is conveyed to the vicinity of the second ash inlet 304, the cover plate 4 at the second ash inlet 304 is controlled to move downward by the corresponding take-up wheel 402, wire rope 403 and return spring 404, and the second ash inlet 304 is connected with the discharge end of the second hose 2012. The water absorbent is added into the material conveying barrel 301 through the second ash inlet 304, mixed with the second slurry, and then conveyed to the grouting pipe through the discharge port, and injected into the deep soft soil through the grouting pipe; the corresponding ash inlet is opened by controlling the take-up wheel 402, wire rope 403, return spring 404 and cover plate 4. The timing of mixing the first slurry with the stimulator and the water absorbent can be controlled, so as to avoid the stimulator and the water absorbent being added into the material conveying barrel 301 in advance, causing the first slurry to react with the stimulator and the water absorbent in advance, and coagulating before being injected into the deep soft soil, resulting in pipe blockage, and thus being unable to be smoothly injected into the deep soft soil; at the same time, it can also avoid the stimulator and the water absorbent being added into the material conveying barrel 301 too late, so that the stimulator and the first slurry are not yet reacted and are conveyed into the soft soil, affecting the curing effect; the material input timing is controlled by the take-up wheel 402, the wire rope 403, the cover plate 4 and the reset spring 404, the structure is simple, the manufacturing cost is low, and the existing sludge curing process is not changed; the take-up wheel 402 can select an electric take-up drum, which is connected to the control unit to realize automatic control; the installation position of the take-up wheel 402 and the installation position of the motor do not interfere with each other.

[0031] In another technical solution, the distance between the first ash inlet 303 and the discharge port is 0.4-0.6 m.

[0032] In this technical solution, after multiple tests by construction personnel, the distance between the setting position of the first ash inlet 303 and the discharge port is controlled between 0.4 and 0.6 m, which can ensure that the activator and the first slurry do not coagulate before being injected into the deep soft soil, and the hydration reaction is sufficient to ensure the curing effect.

[0033] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A deep soft soil solidification process, characterized in that: The following steps are involved: S1, mixing the curing agent main agent with water and additives to form a first slurry; S2, transporting the first slurry to the deep soft soil, the first slurry is first mixed with the activator to form the second slurry during the transportation process, and then mixed with the water absorbent and immediately transported to the deep soft soil; S3, mixing and stirring the water absorbent, the second slurry and the deep soft soil to complete the deep soft soil solidification treatment.

2. The deep soft soil solidification process according to claim 1, characterized in that: In step S1, the mass ratio of the curing agent main agent to water is 1:0.6-1:1.2; the amount of the admixture is 1%-8% of the curing agent main agent; and the mixing and stirring time is 5min-15min.

3. The deep soft soil solidification process according to claim 1, characterized in that: The main curing agent includes steel slag powder, granulated blast furnace slag, fly ash, desulfurized ash, phosphogypsum, and alkaline slag; the admixture includes triethanolamine, polycarboxylic acid water reducer, and molecular surfactant; the activator includes sodium hydroxide, sodium silicate, sodium sulfate, and lithium salt; the water absorbent is sodium polyacrylate SAP super absorbent resin; The mass ratio of the main curing agent to the activator is 1:0.15-1:0.35, the mass ratio of the main curing agent to the water absorbent is 1:0.05-1:0.25, and the mass content of the main curing agent in the soft soil is 5%-15%.

4. The deep soft soil solidification process according to claim 3, characterized in that: The fineness of the steel slag powder of the main curing agent is 1-100 mesh, and the fineness of granulated blast furnace slag, fly ash, desulfurization ash, phosphogypsum and alkali slag is 1-300 mesh; the sodium hydroxide of the activator is in flake or powder form with a purity of ≥92%; sodium silicate and sodium sulfate are both in powder form with a purity of ≥90%; the lithium salt is one of lithium carbonate and lithium sulfate with a purity of ≥95%.

5. The deep soft soil solidification process according to claim 3, characterized in that: The polycarboxylate water reducer is an ester-based slow-release polycarboxylate high-efficiency water reducer; the sodium polyacrylate SAP superabsorbent resin is in powder form.

6. The deep soft soil solidification process according to claim 1, characterized in that: When the first slurry is mixed with the activator and the water absorbing agent, a mixing and conveying device is used for mixing, and the mixing and conveying device includes: External pulping equipment, comprising a pulping tank, a first storage tank, a second storage tank, a third storage tank, a fourth storage tank, a first material conveyor, a second material conveyor, and a water tank, wherein the first storage tank is used to store the curing agent main agent, the second storage tank is used to store the additive, the first storage tank and the second storage tank are respectively connected to the pulping tank through the first material conveyor and the second material conveyor, a stirring shaft is provided in the pulping tank, the pulping tank is also connected to the water tank, and the pulping tank is used to prepare the first slurry; the third storage tank and the fourth storage tank are respectively used to store the activator and the water absorbent; A feeding device is connected with the slurry making tank through a slurry delivery hose, a first ash inlet and a second ash inlet are provided on the feeding device, the third storage tank and the fourth storage tank are respectively connected with the first ash inlet and the second ash inlet through a first hose and a second hose, the first slurry enters the feeding device through the slurry delivery hose and is sequentially mixed with an activator and a water absorbent and then transported to the deep soft soil.

7. The deep soft soil solidification process according to claim 6, characterized in that: The feeding device is installed on the digging arm of the mechanical equipment, and the feeding device includes: A material conveying bucket is fixedly arranged at the end of the excavating arm of the mechanical equipment, a spiral shaft is installed in the material conveying bucket along its axial direction, a feed port is arranged at the top of the material conveying bucket, a discharge port is arranged at the bottom, the feed port is communicated with the slurry delivery hose, the first ash inlet and the second ash inlet are arranged on the side wall of the material conveying bucket, and the second ash inlet is arranged close to the discharge port; A stirring head is installed at the bottom of the material conveying barrel. A grouting pipe is embedded in the stirring head. The grouting pipe is connected to the discharge port. The second slurry and the water absorbent in the material conveying barrel are injected into the deep soft soil through the grouting pipe. The stirring head is used to stir the water absorbent, the second slurry and the deep soft soil.

8. The deep soft soil solidification process according to claim 7, characterized in that: The discharge end of any hose is fixedly connected to the corresponding ash inlet, and a sliding assembly is installed at any ash inlet, and the sliding assembly includes: Two slide rails are symmetrically installed on both sides of the ash inlet, a cover plate is slidably arranged on the slide rail, an arc-shaped groove is opened on the top of the cover plate, the hose is located in the arc-shaped groove, and there is a gap between the inner side wall of the cover plate and the outer side wall of the material conveying barrel, which can be used to accommodate the hose; A wire take-up wheel is installed on the top of the material conveying cylinder, the wire take-up wheel is connected to the top of the cover plate through a steel wire rope, and the wire take-up wheel drives the cover plate to slide on the slide rail through the steel wire rope; Two return springs are symmetrically mounted on both sides of the top of the cover plate, one end of each return spring is connected to the cover plate, and the other end is connected to the outer wall of the material conveying barrel; When the reset spring is in an extended state, the inner wall of the arc groove contacts the outer wall of the hose, and the hose is connected to the ash inlet; when the wire rope is reeled in by the drive take-up wheel to squeeze the reset spring and drive the cover plate to move up, the inner wall of the arc groove squeezes the hose, and the hose is not connected to the ash inlet.

9. The deep soft soil solidification process according to claim 7, characterized in that: The distance between the first ash inlet and the discharge port is 0.4-0.6 m.

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