Self-water-absorption fracturing device for mucky soil and grouting method for mucky soil

Abstract

The invention relates to a self-water-absorption fracturing device for mucky soil and a grouting method for the mucky soil, the self-water-absorption fracturing device comprises a water-absorption fracturing assembly, the water-absorption fracturing assembly comprises a water-absorption resin body, a water-permeable forming layer and a water-permeable supporting layer, a containing space is formed in the inner side of the water-permeable forming layer, the water-absorption resin body is located in the containing space, and the water-permeable supporting layer is located in the containing space. The accommodating space is used for accommodating a plurality of water-absorbent resin particles so as to form a water-absorbent resin body on the inner side of the water-permeable forming layer; the periphery of the water-permeable forming layer is coated with the water-permeable supporting layer, and the water-permeable supporting layer is used for supporting the formed water-absorbent resin body; and the water absorption fracturing assembly is inserted into a grouting hole pre-formed in the mucky soil, so that water in the mucky soil is absorbed through the water absorption resin body, and the mucky soil cracks through water absorption expansion of the water absorption resin. The technical problems that slurry for reinforcing mucky soil diffuses unevenly, and the reinforcing effect is poor are solved.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering, and in particular to a self-absorbing water-induced cracking device for silty soil and a grouting method for silty soil. Background Art

[0002] In recent years, with the acceleration of urbanization and the continuous advancement of infrastructure construction, the treatment and reinforcement technology of silty soil has gradually become a research hotspot in the field of geotechnical engineering. Silty soil is widely distributed in coastal areas, plains, and inland depressions. It is characterized by high natural water content, high compressibility, low strength, and poor permeability, posing many challenges to engineering construction. Therefore, it is necessary to reinforce the silty soil before construction. Currently, the reinforcement methods for silty soil mainly include mechanical reinforcement, chemical reinforcement, and physical reinforcement. Common reinforcement techniques include deep mixing piles, preloading, vacuum preloading, and chemical grouting. Although these methods can improve the stability and bearing capacity of the soil to a certain extent, they also have some problems, such as long construction period, high cost, significant negative environmental impact, and difficulty in controlling the construction process.

[0003] Specifically,

[0004] 1. Deep mixing pile method: This method involves inserting mixing piles into the soil (silty soil) and mechanically mixing them to combine the soil with cement grout and other solidifying agents, forming a stable soil structure. However, the cement grout can only guarantee the structural strength of the mixing pile itself, and the connection between the mixing pile and the surrounding silty soil layer is not tight enough. This results in the mixing pile still having low connection strength with the surrounding silty soil layer after it is formed.

[0005] 2. Chemical grouting: This method involves injecting chemical grout into the soil (silty soil) to form a cementing substance, thereby improving the soil's strength and stability. However, the chemical grout only fills the pores or cracks in the soil, and its cementing effect with the surrounding soil particles is very limited. This results in poor overall integrity of the reinforced soil and a tendency for uneven strength. Furthermore, this method typically requires specialized chemical materials, which is not only costly but may also cause environmental pollution.

[0006] 3. Preloading and vacuum preloading: These two methods apply external pressure or vacuum load to drain pore water from the soil (silty soil), thereby promoting soil consolidation and enhancing its bearing capacity. However, external pressure or vacuum load is only effective for soil within and near the applied force range, and its drainage efficiency is weak for soil far from the load. This results in a long treatment cycle and poor performance in deep silt layers, making it difficult to ensure uniform consolidation of deep soil.

[0007] Besides traditional soil reinforcement methods, innovative research on soil reinforcement (such as microbial reinforcement methods) has gradually increased in recent years with the continuous development of engineering technology. However, these methods are still in the exploratory stage and their practical application is relatively limited. Currently, no comprehensive solutions have been provided for the problem of uneven diffusion of slurry in silty soils and poor reinforcement effects.

[0008] Therefore, this invention proposes a self-absorbing water-induced cracking device for silty soil and a grouting method for silty soil, in order to overcome the defects of the prior art. Summary of the Invention

[0009] The purpose of this invention is to provide a self-absorbing water-inducing cracking device and a grouting method for silty soil. This invention solves the problems faced in the reinforcement of silty soil in the prior art through a simple and efficient self-absorbing water-inducing cracking device and grouting method. It uses an environmentally friendly, high-efficiency water-absorbing resin as the main absorbent material for the silty soil. Through the water absorption and water-absorbing collision ability of the resin, cracks are generated in the silty soil, achieving the effects of water absorption-induced cracking and grouting reinforcement, thereby improving the stability of the silty soil.

[0010] The self-absorbing water-induced cracking device and grouting method for silty soil of the present invention have the advantages of simple operation, short construction period and environmental friendliness. At the same time, it can significantly reduce the cost of soil reinforcement and significantly improve the reinforcement effect of silty soil.

[0011] The objective of this invention can be achieved through the following methods:

[0012] This invention provides a self-absorbing water-inducing fracturing device for silty soil, the device comprising a water-absorbing fracturing component.

[0013] The water-absorbing crack-inducing component includes:

[0014] The water-absorbing resin body is a columnar structure extending along a length direction;

[0015] A permeable molding layer has an inner space for receiving the water-absorbing resin body located within the receiving space. The receiving space is used to receive a plurality of water-absorbing resin particles to form the water-absorbing resin body on the inner side of the permeable molding layer.

[0016] A permeable support layer is provided, which covers the outer periphery of the permeable molding layer and is used to support the molded water-absorbing resin body.

[0017] The water-absorbing crack-inducing component is inserted into a grouting hole pre-set on the silty soil to absorb moisture from the silty soil through the water-absorbing resin body, and to cause cracks in the silty soil by the expansion of the water-absorbing resin.

[0018] In a preferred embodiment of the present invention, the permeable molding layer is a cylindrical structure with one end open and the other end closed, and the receiving space is formed inside the cylindrical structure of the permeable molding layer. The water-absorbing resin body is formed inside the permeable molding layer, and an opening is formed at the top of the water-absorbing resin body.

[0019] And / or, the permeable support layer is a cylindrical structure with one end open and the other end closed, the permeable support layer covers the side wall and bottom surface of the permeable molding layer, and forms an opening at the top of the water-absorbing resin body.

[0020] In a preferred embodiment of the present invention, the water-absorbing and cracking component further includes a sleeve, the sleeve having a first state and a second state;

[0021] When the sleeve is in the first state, the sleeve is sleeved on the outside of the permeable support layer, and the water-absorbing and cracking component is not inserted into the grouting hole;

[0022] When the casing is in the second state, the water-absorbing and cracking component is inserted into the grouting hole, and the casing is pulled out from the grouting hole and separated from the permeable support layer.

[0023] In a preferred embodiment of the present invention, the water-absorbing and cracking component further includes a pressing member. When the water-absorbing and cracking component is inserted into the grouting hole, the pressing member presses the water-absorbing and cracking component to the bottom of the grouting hole to pull the sleeve out of the grouting hole.

[0024] In a preferred embodiment of the present invention, the self-absorbing water-inducing cracking device for silty soil further includes a cover plate, the cover plate having at least one through hole, the through hole being disposed opposite to the grouting hole, and a water-stop valve being disposed at the through hole.

[0025] In a preferred embodiment of the present invention, the self-absorbing water-inducing cracking device for silty soil further includes a first container, a second container, an air pump, and a grouting pipe. The first container is filled with the silty soil and contains soil-stabilizing slurry. The cover plate is placed over the top opening of the first container. When the water-absorbing resin absorbs water and expands to cause cracks in the silty soil, the water-absorbing cracking component in the grouting hole is replaced with the grouting pipe. The outer wall of the grouting pipe has multiple liquid outlet holes. The grouting pipe is inserted into the grouting hole. The top end of the grouting pipe is located above the cover plate and connected to one end of the grouting pipeline. The other end of the grouting pipeline communicates with the interior of the second container. The interior of the second container is also connected to the air pump through an air pump pipeline.

[0026] This invention provides a grouting method for silty soil, which is implemented using the aforementioned self-absorbing water-inducing cracking device for silty soil. The grouting method for silty soil includes the following steps:

[0027] Step S1: Select the area of ​​silty soil that needs to be reinforced, and drill holes in the silty soil layer in the area to form grouting holes;

[0028] Step S2: Insert the water-absorbing and crack-inducing component into the grouting hole;

[0029] Step S3: The water-absorbing resin in the water-absorbing crack-inducing component absorbs the moisture in the silty soil and expands. The water-absorbing resin in the expanded state will squeeze the silty soil around it until cracks appear in the silty soil.

[0030] Step S4: Remove the water-absorbing cracking component from the grouting hole and insert the grouting pipe into the grouting hole. Inject soil-stabilizing grout into the grouting hole through the grouting pipe so that the soil-stabilizing grout enters the crack.

[0031] In a preferred embodiment of the present invention, step S1 includes:

[0032] Step S101: Select the area of ​​silty soil that needs to be reinforced;

[0033] Step S102: Cover the top of the soil layer in this area with a cover plate;

[0034] Step S103: Drill holes at the positions corresponding to the through holes on the cover plate;

[0035] Step S104: Adjust the number of boreholes, borehole depth, and / or borehole location as needed to reinforce the area and / or the degree of reinforcement required.

[0036] In a preferred embodiment of the present invention, in step S2, after the water-absorbing and cracking component is inserted into the grouting hole, a pressure member is used to press the water-absorbing and cracking component into the grouting hole from top to bottom until it abuts against the bottom of the grouting hole, and then the sleeve is pulled out from the grouting hole.

[0037] In a preferred embodiment of the present invention, in step S3, the water-absorbing resin is replaced with a new one at preset intervals to continuously absorb moisture from the silty soil and increase the diameter of the grouting hole due to compression until cracks appear in the silty soil.

[0038] As described above, the features and advantages of the self-absorbing water-inducing cracking device and the grouting method for silty soil of the present invention are as follows:

[0039] The water-absorbing cracking component of this invention utilizes a receiving space formed on the inner side of a permeable molding layer to accommodate water-absorbing resin particles. This creates a columnar structure of water-absorbing resin extending along a length direction within the permeable molding layer. This water-absorbing resin can adapt to silty soil at a certain depth along its length. By inserting the water-absorbing cracking component into a pre-set grouting hole in the silty soil, the water-absorbing resin particles absorb water, retain water, and expand after absorbing water. The resin absorbs moisture from the silty soil and applies pressure to it through its expansion, causing the surrounding silty soil to lose water and crack. This allows for effective reinforcement of the silty soil through grouting. Furthermore, the permeable support layer ensures the stability of the water-absorbing resin after insertion into the silty soil. After construction, the entire water-absorbing cracking component can be removed from the grouting hole through the permeable support layer. The device achieves optimized performance in insertion positioning, efficient water absorption, expansion adaptation, and complete recovery, filling a gap in the research of water-absorbing resin application equipment.

[0040] The grouting method for silty soil in this invention solves the problems faced by existing technologies in the reinforcement of silty soil. It uses an environmentally friendly, high-efficiency water-absorbing resin as the main absorbent material for the silty soil. Through the water absorption and impact capabilities of the resin, cracks are generated in the silty soil, achieving both water absorption-induced cracking and grouting reinforcement. This ensures excellent reinforcement performance for silty soil. This method can significantly improve the mechanical properties and stability of silty soil, meeting the construction requirements for reinforced silty soil structures. It is suitable for the reinforcement of various types of silty soil, especially soils with low bearing capacity and poor stability, and has broad application prospects in construction, infrastructure development, roads, and bridges. Attached Figure Description

[0041] The accompanying drawings are intended only to illustrate and explain the present invention and do not limit the scope of the invention.

[0042] in:

[0043] Figure 1 This is a cross-sectional schematic diagram of the water-absorbing cracking component in the self-absorbing water-inducing cracking device for silty soil of the present invention.

[0044] Figure 2 This is a schematic diagram of the structure of the water-absorbing cracking component in the self-absorbing water-absorbing cracking device for silty soil of the present invention, under the condition of the pressure component squeezing the water-absorbing resin body.

[0045] Figure 3 This is a schematic diagram of the cover plate and the first container in the self-absorbing water-inducing cracking device for silty soil of the present invention;

[0046] Figure 4 This is a schematic diagram of the self-absorbing water-inducing cracking device for silty soil according to the present invention.

[0047] The reference numerals in the accompanying drawings of this invention are:

[0048] 1. Water-absorbing resin body; 2. Water-permeable molding layer;

[0049] 3. Permeable support layer; 4. Sleeve;

[0050] 5. Pressing element; 6. Cover plate;

[0051] 601. Through hole; 7. First container;

[0052] 8. Grouting pipeline; 9. Second container;

[0053] 10. Air pump piping; 11. Air pump;

[0054] 12. Silt-rich soil; 13. Soil-stabilizing slurry;

[0055] 14. Weighing device; 15. Grouting pipe;

[0056] 100. Water-absorbing cracking component. Detailed Implementation

[0057] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art fall within the scope defined by the appended claims.

[0058] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0060] Water-absorbing resin is characterized by its high water absorption capacity, capable of absorbing hundreds to thousands of times its own weight in water. Furthermore, it expands in volume after absorbing water, making its water absorption capacity far exceed that of traditional absorbent materials. In addition, it possesses high water retention properties, forming a hydrogel after absorbing water, making it difficult to expel the water even under pressure. This invention utilizes the aforementioned water absorption, expansion, and water retention characteristics of water-absorbing resin. By placing the resin in silty soil and replacing it according to its absorption status, the resin continuously absorbs water from the silty soil, achieving a water-absorbing and cracking effect. This provides superior grouting conditions for grouting reinforcement of silty soil and improves the stability of the grouted soil.

[0061] Implementation Method 1

[0062] like Figure 1 and Figure 2 As shown, the present invention provides a self-absorbing water-inducing cracking device for silty soil. This device includes a water-absorbing cracking component 100, which comprises a water-absorbing resin body 1, a permeable forming layer 2, and a permeable support layer 3. The water-absorbing resin body 1 is a columnar structure extending along a length direction. An accommodating space is formed on the inner side of the permeable forming layer 2, within which the water-absorbing resin body 1 is located. The accommodating space is used to accommodate a plurality of water-absorbing resin particles to form the water-absorbing resin body 1 on the inner side of the permeable forming layer 2. The permeable support layer 3 covers the outer periphery of the permeable forming layer 2 and supports the formed water-absorbing resin body 1. During use, the water-absorbing cracking component 100 is inserted into a pre-drilled grouting hole in the silty soil 12. The water-absorbing resin body 1 absorbs moisture from the silty soil 12, and the water-absorbing resin body 1 expands upon absorbing water, causing cracks to form in the silty soil 12.

[0063] The water-absorbing crack-inducing component 100 of this invention can accommodate water-absorbing resin particles through the receiving space formed on the inner side of the permeable molding layer 2, thereby forming a columnar structure of water-absorbing resin body 1 extending along a length direction on the inner side of the permeable molding layer 2. The water-absorbing resin body 1 can be adapted to a certain depth of silty soil 12 in the length direction. By inserting the water-absorbing crack-inducing component 100 into the grouting hole preset on the silty soil 12, the water-absorbing resin particles have the characteristics of absorbing water, retaining water, and expanding after absorbing water. The water-absorbing resin body 1 will absorb the water in the silty soil 12, and apply pressure to the silty soil 12 through the expansion of the water-absorbing resin, causing the silty soil 12 on its outer periphery to lose water and generate cracks. Then, the reinforcement effect of the silty soil 12 can be effectively improved by grouting. Moreover, by setting up the permeable support layer 3, the invention not only ensures the morphological stability of the water-absorbing resin body 1 after it is inserted into the silty soil 12, but also allows the water-absorbing cracking component 100 to be pulled out of the grouting hole as a whole through the permeable support layer 3 after construction is completed. The device achieves performance optimization in insertion positioning, efficient water absorption, expansion adaptation and complete recovery, filling the gap in the research of water-absorbing resin application equipment.

[0064] In an optional embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the permeable molding layer 2 is a cylindrical structure with one end open and the other end sealed. A space is formed within the cylindrical structure of the permeable molding layer 2, and the water-absorbing resin body 1 is molded inside the permeable molding layer 2, with an opening at the top. The permeable molding layer 2 itself needs to have a certain degree of air permeability and water permeability to allow water in the silty soil 12 to pass through smoothly, thereby ensuring that the water-absorbing resin body 1 can fully absorb the water in the silty soil 12 to exert its water-absorbing effect. In addition, the permeable molding layer 2 also functions as a filter. Its small pores and permeability allow it to encapsulate small particles of water-absorbing resin, preventing leakage. Furthermore, after the water-absorbing resin body 1 absorbs water, it can expand along with the water-absorbing resin body 1, achieving adaptive deformation. The permeable molding layer 2 also prevents solid impurities in the silty soil 12 from entering, achieving the purpose of filtering solid impurities and extending the service life of the water-absorbing resin body 1.

[0065] In this invention, the permeable molding layer 2 is made of, but is not limited to, permeable fabric or mesh.

[0066] In an optional embodiment of the present invention, such as Figure 1 and Figure 2As shown, the permeable support layer 3 is a cylindrical structure with one end open and the other end closed. The permeable support layer 3 covers the side wall and bottom surface of the permeable molding layer 2, and forms an opening at the top of the water-absorbing resin body 1. Compared with the permeable molding layer 2, the permeable support layer 3 is required to have larger pores and higher strength. The permeable support layer 3 is required to be permeable and will not affect the smooth passage of water in the silty soil 12. Moreover, the strength of the permeable support layer 3 is sufficient to support the entire water-absorbing cracking component 100 being lifted out of the grouting hole after construction.

[0067] Furthermore, a lifting structure can be installed on the top of the permeable support layer 3, allowing operators to pull upwards using the lifting structure to remove the water-absorbing and cracking component 100 entirely from the grouting hole. The lifting structure can be, but is not limited to, a pull ring installed on the top of the permeable support layer 3.

[0068] In this invention, the permeable support layer 3 can be made of, but is not limited to, nylon mesh, metal wire mesh, or high-strength fiber mesh. When the absorbent resin 1 is not absorbing water and swelling, the permeable support layer 3 provides support; however, when the absorbent resin 1 is absorbing water and swelling, because the permeable support layer 3 is a soft support, it can deform as the absorbent resin 1 expands. The permeable support layer 3 has high permeability and can withstand the expansion stress of the absorbent resin 1 without being damaged.

[0069] In an optional embodiment of the present invention, such as Figure 2 As shown, along the length of the water-absorbing resin body 1, the length of the permeable molding layer 2 is greater than the length of the permeable support layer 3, and the lengths of both the permeable molding layer 2 and the permeable support layer 3 are greater than the depth of the grouting hole, so as to ensure that the water-absorbing resin body 1 can be inserted to the bottom of the grouting hole to achieve the best water absorption, expansion and cracking effect.

[0070] In an optional embodiment of the present invention, such as Figure 1 As shown, the water-absorbing fracturing component 100 also includes a sleeve 4, which has a first state and a second state. When the sleeve 4 is in the first state, it is fitted over the outside of the permeable support layer 3, and the water-absorbing fracturing component 100 is not inserted into the grouting hole. When the sleeve 4 is in the second state, the water-absorbing fracturing component 100 is inserted into the grouting hole, and the sleeve 4 is pulled out of the grouting hole and separated from the permeable support layer 3. The sleeve 4 can be, but is not limited to, a thin iron pipe. The sleeve 4 provides support for the insertion of the water-absorbing fracturing component 100 into the grouting hole, ensuring that the water-absorbing fracturing component 100 can be smoothly inserted and reach the bottom of the grouting hole. After the water-absorbing fracturing component 100 is inserted to the bottom of the grouting hole, the sleeve 4 can be pulled out of the grouting hole.

[0071] Furthermore, along the length of the water-absorbing resin body 1, the length of the sleeve 4 is less than the length of the permeable support layer 3, and the length of the sleeve 4 is greater than the depth of the grouting hole. Thus, during the process of inserting the water-absorbing cracking component 100 into the grouting hole, sufficient support can be provided for the water-absorbing cracking component 100 in the grouting hole to ensure that the water-absorbing cracking component 100 is smoothly inserted into the grouting hole.

[0072] Furthermore, the sleeve 4 can be in multiple segments, with the segments connected by threads along the length of the absorbent resin body 1. In practical applications, different numbers of multi-segment sleeves 4 can be selected for threaded connection according to the depth of the grouting hole, thereby adapting to grouting holes of different depths and providing better adjustment and adaptability.

[0073] Furthermore, the outer diameter of the sleeve 4 is consistent with the diameter of the grouting hole so that the sleeve 4 can be smoothly and stably inserted into the grouting hole without deviation or shaking.

[0074] In an optional embodiment of the present invention, such as Figure 2 As shown, the water-absorbing and fracturing component 100 also includes a pressing member 5. When the water-absorbing and fracturing component 100 is inserted into the grouting hole, the pressing member 5 presses the water-absorbing and fracturing component 100 to the bottom of the grouting hole to pull the sleeve 4 out of the grouting hole. The pressing member 5 can be, but is not limited to, an iron rod. After the water-absorbing and fracturing component 100 is inserted into the grouting hole, an iron rod can be inserted into the grouting hole. With the pushing force of the iron rod, the water-absorbing resin body 1, the water-permeable molding layer 2, and the water-permeable support layer 3 are pushed together to the bottom of the grouting hole (the bottom of the water-absorbing and fracturing component 100 abuts against the bottom wall of the grouting hole), and then the sleeve 4 is slowly and steadily pulled out.

[0075] The self-absorbing water-inducing fracturing device for silty soil of the present invention can not only be used for the reinforcement treatment of silty soil 12 under actual working conditions (actual soil fracturing and reinforcement conditions), but also applied to reinforcement experiments of silty soil 12. As for the self-absorbing water-inducing fracturing device used in experiments, such as... Figure 3 and Figure 4 As shown, the self-absorbing water-inducing fracturing device for silty soil also includes a cover plate 6, which has at least one through hole 601. In actual operation, the cover plate 6 can be placed on the top surface of the silty soil 12, ensuring that the through hole 601 is opposite to the grouting hole opened on the silty soil 12. An internal thread can be provided on the inner wall of the through hole 601, and a water stop valve can be provided at the through hole 601. After the water-absorbing fracturing component 100 completes the water absorption and expansion fracturing of the silty soil 12, the water-absorbing fracturing component 100 can be removed from the grouting hole, and the water stop valve can be opened. The grouting pipeline 8 is threaded into the through hole 601 to facilitate subsequent grouting operations into the grouting hole.

[0076] Furthermore, such as Figure 3 and Figure 4 As shown, the self-absorbing water-induced cracking device for silty soil also includes a first container 7, a second container 9, an air pump 11, and a grouting pipe 15. The first container 7 is filled with silty soil 12 and contains soil-stabilizing slurry 13. At this time, the cover plate 6 can be placed on the top opening of the first container 7. When the water-absorbing resin body 1 absorbs water and expands to cause cracks in the silty soil 12, the water-absorbing cracking component 100 in the grouting hole is replaced with the grouting pipe 15. The outer wall of the grouting pipe 15 has multiple liquid outlet holes. The grouting pipe 15 is inserted into the grouting hole and the bottom end of the grouting pipe 15 extends to the bottom of the grouting hole. The top end of the grouting pipe 15 is located above the cover plate 6 and is connected to one end of the grouting pipe 8 or one end of the grouting pipe 8 is directly threaded to the through hole 601 on the cover plate 6. The other end of the grouting pipe 8 is connected to the inside of the second container 9. The inside of the second container 9 is also connected to the air pump 11 through the air pump pipe 10. The air pump 11 provides pumping pressure, and the soil grout 13 in the second container 9 is pumped from the grouting pipeline 8 to the grouting tube 15. The grout is then discharged into the cracks of the silty soil 12 through multiple outlet holes on the grouting tube 15, thereby achieving grouting reinforcement of the silty soil 12.

[0077] In this invention, the air pump 11 can be a conventional air pump.

[0078] In this invention, the grouting pipe 8 can be, but is not limited to, a plum blossom pipe or a sleeve valve pipe. Of course, other types of grouting pipes can also be used. The specific structure of the grouting pipe 8 is not limited here.

[0079] Furthermore, such as Figure 4 As shown, the first container 7 can be placed on the weighing device 14. Before the experiment, the weight of the silty soil 12 in the first container 7 is weighed by the weighing device 14 to ensure that the first container 7 contains the same weight of silty soil 12 in each experiment, so that the results of multiple sets of experiments can be accurately compared later.

[0080] The features and advantages of the self-absorbing water-inducing fracturing device for silty soil of the present invention are as follows:

[0081] This self-absorbing water-inducing cracking device for silty soil utilizes the characteristics of water-absorbing resin particles, which absorb and retain water and expand after absorbing water. The water-absorbing resin body 1 inserted into the grouting hole absorbs the water in the silty soil 12, and applies pressure to the silty soil 12 through the expansion of the water-absorbing resin, causing the silty soil 12 on its periphery to lose water and generate cracks. Then, the reinforcement effect of the silty soil 12 can be effectively improved by grouting. Moreover, the invention, through the setting of the permeable support layer 3, not only ensures the morphological stability of the water-absorbing resin body 1 after insertion into the silty soil 12, but also allows the water-absorbing cracking component 100 to be completely removed from the grouting hole through the permeable support layer 3 after construction. The device achieves performance optimization of insertion positioning, efficient water absorption, expansion adaptation and complete recovery, filling the gap in the research of water-absorbing resin application equipment.

[0082] Implementation Method 2

[0083] This invention provides a grouting method for silty soil, which is implemented using the aforementioned self-absorbing water-inducing fracturing device for silty soil. The grouting method for silty soil includes the following steps:

[0084] Step S1: Select the area of ​​silty soil 12 that needs to be reinforced, and drill holes in the silty soil 12 layer in the area to form grouting holes;

[0085] Step S2: Insert the water-absorbing and cracking component 100 into the grouting hole;

[0086] In step S2, after the water-absorbing and cracking component 100 is inserted into the grouting hole, the pressure piece 5 is inserted from top to bottom into the grouting hole to press the water-absorbing and cracking component 100 until it abuts against the bottom of the grouting hole, and then the sleeve 4 is pulled out from the grouting hole.

[0087] Step S3: The water-absorbing resin body 1 in the water-absorbing cracking component 100 absorbs the water in the silty soil 12 and expands. The water-absorbing resin body 1 in the expanded state will squeeze the silty soil 12 around it until cracks appear in the silty soil 12.

[0088] Step S4: Remove the water-absorbing cracking component 100 from the grouting hole and insert the grouting tube 15 into the grouting hole. Inject the soil-stabilizing grout 13 into the grouting hole through the grouting tube 15 so that the soil-stabilizing grout 13 enters the crack.

[0089] In step S4, when injecting the soil-stabilizing grout 13 into the grouting hole, the grouting pressure can be appropriately increased by controlling the air pump 11, so that the soil-stabilizing grout 13 can be better dispersed in the silty soil 12, and the soil-stabilizing grout 13 entering the crack can have more compressive force, so as to enlarge the crack and improve the grouting reinforcement effect.

[0090] In this invention, the soil stabilizing grout 13 can be, but is not limited to, a cement-based or polymeric grout. Any existing grout capable of stabilizing soil can be used, and the specific type of soil stabilizing grout 13 is not limited here.

[0091] The grouting method for silty soil in this invention solves the problems faced in the reinforcement of silty soil 12 in the prior art. It uses environmentally friendly high-efficiency water-absorbing resin as the main water-absorbing material for silty soil. Through the water absorption and water-absorbing collision ability of the water-absorbing resin body 1, cracks are generated in the silty soil 12, so as to achieve the effect of water absorption and cracking of silty soil 12 and grouting reinforcement. It ensures excellent reinforcement performance of silty soil 12. This method can significantly improve the mechanical properties and stability of silty soil 12, meet the construction requirements of silty soil 12 reinforcement structures, and is applicable to the reinforcement treatment of various types of silty soil 12, especially suitable for soils with low bearing capacity and poor stability. It has broad application prospects in the fields of construction, infrastructure construction, road and bridge construction, etc.

[0092] In an optional embodiment of the present invention, step S1 includes:

[0093] Step S101: Select the area of ​​silty soil 12 that needs to be reinforced;

[0094] Step S102: Cover the top of the soil layer in this area with a cover plate 6 that has a reserved through hole 601; wherein, a thread is formed on the inner wall of the through hole 601, which not only facilitates connection with the grouting pipeline 8, but also allows a water stop valve to be installed at the through hole 601 so as to control the grouting status in the future.

[0095] Step S103: Drill holes at the positions corresponding to the through holes 601 on the cover plate 6; wherein, a water drill is used to drill holes in the silty soil 12 below the cover plate 6 through the reserved through holes 601.

[0096] Step S104: Adjust the number of boreholes, borehole depth and / or borehole position according to the range of the area to be reinforced and / or the degree of reinforcement required. The resulting boreholes are the grouting holes.

[0097] In an optional embodiment of the present invention, in step S3 above, a new water-absorbing resin body 1 is replaced at preset intervals to continuously absorb moisture from the silty soil 12 and increase the diameter of the grouting holes due to compression until cracks appear in the silty soil 12. During the expansion process of the water-absorbing resin body 1, it not only helps the water-absorbing resin body 1 to further absorb moisture, but also exerts a certain squeezing effect on the surrounding silty soil 12, thereby improving the mechanical properties of the soil and making the soil mass of the silty soil 12 more stable.

[0098] In this embodiment, steps S2 and S3 can be repeated every 6-12 hours to replace the water-absorbing resin body 1. After a period of water absorption, the grouting holes in the silty soil 12 will be enlarged. Simultaneously, due to the removal of water, cracks will appear in the silty soil 12, facilitating subsequent grouting operations. During the actual cracking process of the silty soil 12, multi-level micro-cracks will form within it. With the passage of time and the synergistic effect of grouting pressure, these micro-cracks gradually enlarge until they connect with each other, forming a dendritic or network-like crack system in a certain area of ​​the silty soil 12. This provides a channel for the subsequent penetration of the soil-stabilizing grout 13 into the silty soil 12. The grout is then injected along the cracks, filling the crack spaces and consolidating to form a composite structure of "dendritic expansion cracks + grout vein skeleton," achieving a reinforcement effect on the silty soil 12. This method can significantly improve the mechanical properties and stability of soil, meet the construction requirements for the reinforcement of silty soil 12, and is applicable to the reinforcement of various types of silty soil 12, especially soils with low bearing capacity and poor stability. It has broad application prospects in the fields of construction, infrastructure construction, roads and bridges.

[0099] In an optional embodiment of the present invention, the grouting method for silty soil of the present invention further includes:

[0100] Step S5: Once the preset grouting volume is reached, the injection of soil slurry 13 can be stopped;

[0101] Step S6: Pull out the grouting pipe 15 from the grouting hole and close the water stop valve at the through hole 601 to seal the grouting hole, prevent the soil grout 13 from seeping out, and ensure the grouting effect is stable and lasting.

[0102] The following is a detailed process for conducting grouting and water absorption cracking grouting experiments on the excavated silty soil 12:

[0103] Comparative Experiment Scheme 1:

[0104] (1) Sampling and filling of silty soil: Sampling of silty soil 12 was carried out (its specific gravity was measured to be 2.67 and its moisture content to be 40%), and the silty soil 12 was filled into the first container 7 with a size of 20cm×20cm×20cm (e.g., Figure 3 As shown, the top of the first container 7 is covered with a cover plate 6, and the center of the cover plate 6 has a through hole 601 with a diameter of 2.2 cm. The cover plate 6 and the first container 7 can be fixedly connected by 12 bolts.

[0105] During the process of filling the first container 7 with silty soil 12, a round pipe with a diameter of 2.2 cm and a length of 25 cm can be placed in the middle of the first container 7. The round pipe passes through the through hole 601, thereby reserving the position of the grouting hole.

[0106] (2) Grouting equipment: The grouting tube 15 used in the experiment is 25cm long and 2.2cm in diameter. The bottom end of the grouting tube 15 can be sealed. Multiple liquid outlet holes (which can be quincunx holes) communicating with the inside can be set on the side wall of the grouting tube 15 and 15cm away from its top. The distance between two adjacent liquid outlet holes can be 5cm. The top opening of the first container 7 is sealed with a cover plate 6. A silicone gasket can be placed between the cover plate 6 and the first container 7 to ensure the sealing between the cover plate 6 and the first container 7. After the first container 7 is sealed, the grouting tube 15 is inserted into the silty soil 12 through the through hole 601. The soil slurry 13 in the second container 9 is pumped into the silty soil 12 in the first container 7 using an air pump 11 (with a pressure gauge connected to the air pump 11).

[0107] (3) Grouting test: After the device is installed, a grouting test is carried out. The pressure gauge on the air pump 11 is observed. It is found that after 10 seconds of grouting, the grout gushes out from the grouting hole with a pressure of 0 MPa. The amount of soil-stabilizing grout injected into the silty soil is 0 L.

[0108] Comparative Experiment Scheme 2:

[0109] (1) Sampling and filling of silty soil: Sampling of silty soil 12 was carried out (its specific gravity was measured to be 2.67 and its moisture content to be 40%), and the silty soil 12 was filled into the first container 7 with a size of 20cm×20cm×20cm (e.g., Figure 3 As shown, the top of the first container 7 is covered with a cover plate 6, and the center of the cover plate 6 has a through hole 601 with a diameter of 2.2 cm. The cover plate 6 and the first container 7 can be fixedly connected by 12 bolts.

[0110] During the process of filling the first container 7 with silty soil 12, a round pipe with a diameter of 2.2 cm and a length of 25 cm can be placed in the middle of the first container 7. The round pipe passes through the through hole 601, thereby reserving the position of the grouting hole.

[0111] (2) Grouting equipment: The top opening of the first container 7 is sealed with a cover plate 6. A silicone gasket can be placed between the cover plate 6 and the first container 7 to ensure the sealing between the cover plate 6 and the first container 7. After the first container 7 is sealed, the water-absorbing and cracking component 100 is inserted into the grouting hole in the silty soil 12. Then, an iron rod is inserted into the grouting hole. With the pushing force of the iron rod, the water-absorbing resin body 1, the permeable molding layer 2 and the permeable support layer 3 are pushed together to the bottom of the grouting hole (the bottom of the water-absorbing and cracking component 100 abuts against the bottom wall of the grouting hole). Then, the sleeve 4 is slowly and steadily pulled out.

[0112] (4) Grouting after water absorption: Replace the water-absorbing resin body 1 every 6-12 hours, and weigh and record the weight of the water-absorbing resin body 1 taken out each time. After 36 hours, take a sample of the silty soil 12 in the first container 7. The water content of the silty soil 12 measured by the sample changed from 40% to 35%. After the sampling, use the same grouting tube 15 as in the first comparative experiment. Insert the grouting tube 15 into the silty soil 12 through the through hole 601. Use the air pump 11 (connected to the air pump 11) (With a pressure gauge) The soil grout 13 in the second container 9 is pumped into the silty soil 12 in the first container 7. This time, the grouting pressure reaches 0.05MPa and the grouting volume is 0.13L, indicating that the soil grout 13 can be successfully injected into the silty soil 12. This shows that after the silty soil 12 is treated with water-absorbing resin 1 to absorb water and expand and crack, the soil grout 13 can be better injected into the silty soil 12, and the purpose of grouting and reinforcing the silty soil 12 can be better achieved.

[0113] The features and advantages of the grouting method for silty soil of the present invention are as follows:

[0114] First, the grouting method for this silty soil avoids the complex procedures in traditional reinforcement technology. It does not require repeated mixing, sinking and lifting of the mixing head or layered compaction. The water-absorbing resin body 1 achieves water absorption and expansion cracking of the silty soil 12. Then, the soil-stabilizing grout 13 is injected into the cracks to achieve reinforcement of the silty soil 12, thus optimizing the construction process.

[0115] Second, the grouting method for this silty soil uses a combination of environmentally friendly high-efficiency water-absorbing resin and self-compacting soil grout 13, without the need for additional chemical materials, ensuring no pollution to the environment. Traditional chemical materials such as polyurethane grout and urea-formaldehyde resin grout may cause harm to construction workers and the surrounding environment with long-term contact. This method ensures the reinforcement effect on the silty soil 12 while guaranteeing the safety of construction workers.

[0116] The grouting method for this silty soil has the same characteristics and advantages as the self-priming water-induced cracking device for silty soil described above, and will not be repeated here.

[0117] It should be noted that in the description of this application, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more.

[0118] The various embodiments described in this specification are presented in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0119] The above are merely a few embodiments of the present invention. Although the embodiments disclosed in the present invention are as described above, the content is only for the purpose of facilitating understanding of the present invention and is not intended to limit the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A self-absorbing water-inducing fracturing device for silty soil, characterized in that, The self-absorbing water-inducing fracturing device for silty soil includes a water-absorbing fracturing component. The water-absorbing crack-inducing component includes: The water-absorbing resin body is a columnar structure extending along a length direction; A permeable molding layer has an inner space for receiving the water-absorbing resin body located within the receiving space. The receiving space is used to receive a plurality of water-absorbing resin particles to form the water-absorbing resin body on the inner side of the permeable molding layer. A permeable support layer is provided, which covers the outer periphery of the permeable molding layer and is used to support the molded water-absorbing resin body. The water-absorbing crack-inducing component is inserted into a grouting hole pre-set on the silty soil to absorb moisture from the silty soil through the water-absorbing resin body, and to cause cracks in the silty soil by the expansion of the water-absorbing resin.

2. The self-absorbing water-inducing cracking device for silty soil as described in claim 1, characterized in that, The permeable molding layer is a cylindrical structure with one end open and the other end closed. The receiving space is formed inside the cylindrical structure of the permeable molding layer. The water-absorbing resin body is formed inside the permeable molding layer, and an opening is formed at the top of the water-absorbing resin body. And / or, the permeable support layer is a cylindrical structure with one end open and the other end closed, the permeable support layer covers the side wall and bottom surface of the permeable molding layer, and forms an opening at the top of the water-absorbing resin body.

3. The self-absorbing water-inducing cracking device for silty soil as described in claim 1, characterized in that, The water-absorbing and cracking component also includes a sleeve, which has a first state and a second state. When the sleeve is in the first state, the sleeve is sleeved on the outside of the permeable support layer, and the water-absorbing and cracking component is not inserted into the grouting hole; When the casing is in the second state, the water-absorbing and cracking component is inserted into the grouting hole, and the casing is pulled out from the grouting hole and separated from the permeable support layer.

4. The self-absorbing water-inducing cracking device for silty soil as described in claim 3, characterized in that, The water-absorbing and cracking component also includes a pressure member. When the water-absorbing and cracking component is inserted into the grouting hole, the pressure member presses the water-absorbing and cracking component to the bottom of the grouting hole to pull the sleeve out of the grouting hole.

5. The self-absorbing water-inducing cracking device for silty soil as described in claim 1, characterized in that, The self-absorbing water-inducing cracking device for silty soil also includes a cover plate, which has at least one through hole, which is arranged opposite to the grouting hole, and a water-stop valve is provided at the through hole.

6. The self-absorbing water-inducing cracking device for silty soil as described in claim 5, characterized in that, The self-absorbing water-inducing cracking device for silty soil further includes a first container, a second container, an air pump, and a grouting pipe. The first container is filled with the silty soil and contains soil-stabilizing slurry. A cover plate is placed over the top opening of the first container. When the water-absorbing resin absorbs water and expands to cause cracks in the silty soil, the water-absorbing cracking component in the grouting hole is replaced with the grouting pipe. The outer wall of the grouting pipe has multiple liquid outlet holes. The grouting pipe is inserted into the grouting hole. The top end of the grouting pipe is located above the cover plate and connected to one end of the grouting pipeline. The other end of the grouting pipeline is connected to the interior of the second container. The interior of the second container is also connected to the air pump through an air pump pipeline.

7. A grouting method for silty soil, implemented using the self-absorbing water-inducing fracturing device for silty soil as described in any one of claims 1 to 6, characterized in that, The grouting method for the silty soil includes the following steps: Step S1: Select the area of ​​silty soil that needs to be reinforced, and drill holes in the silty soil layer in the area to form grouting holes; Step S2: Insert the water-absorbing and crack-inducing component into the grouting hole; Step S3: The water-absorbing resin in the water-absorbing crack-inducing component absorbs the moisture in the silty soil and expands. The water-absorbing resin in the expanded state will squeeze the silty soil around it until cracks appear in the silty soil. Step S4: Remove the water-absorbing cracking component from the grouting hole and insert the grouting pipe into the grouting hole. Inject soil-stabilizing grout into the grouting hole through the grouting pipe so that the soil-stabilizing grout enters the crack.

8. The grouting method for silty soil as described in claim 7, characterized in that, Step S1 includes: Step S101: Select the area of ​​silty soil that needs to be reinforced; Step S102: Cover the top of the soil layer in this area with a cover plate; Step S103: Drill holes at the positions corresponding to the through holes on the cover plate; Step S104: Adjust the number of boreholes, borehole depth, and / or borehole location as needed to reinforce the area and / or the degree of reinforcement required.

9. The grouting method for silty soil as described in claim 7, characterized in that, In step S2, after the water-absorbing and cracking component is inserted into the grouting hole, a pressure member is used to press the water-absorbing and cracking component into the grouting hole from top to bottom until it abuts against the bottom of the grouting hole, and then the sleeve is pulled out from the grouting hole.

10. The grouting method for silty soil as described in claim 7, characterized in that, In step S3, the water-absorbing resin is replaced with a new one at preset intervals to continuously absorb moisture from the silty soil and increase the diameter of the grouting hole due to compression until cracks appear in the silty soil.

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