Embankment structure based on physicochemical composite modified shield slurry and construction method of embankment structure

Abstract

The invention discloses an embankment structure based on physicochemical composite modified shield slurry and a construction method of the embankment structure, and relates to the field of civil engineering, in the height direction of the embankment structure, a plurality of geotextile tube bags are stacked and arranged above a soil matrix, and the geotextile tube bags are filled with mixed slurry of a curing agent, a flocculating agent and the shield slurry; a connecting belt is connected between every two adjacent geotextile tube bags; a drainage assembly is arranged in each geotextile tube bag, the drainage assemblies are communicated with the outsides of the geotextile tube bags, and water in the mixed slurry can be drained out of the geotextile tube bags through the drainage assemblies. Therefore, by arranging the plurality of geotextile tubes and filling the geotextile tubes with the mixed slurry of the curing agent, the flocculating agent and the shield slurry, cofferdams do not need to be built on the two sides of the embankment in advance, the construction cost is greatly saved, the construction convenience is improved, the mixed slurry in the plurality of geotextile tubes can be solidified and drained at the same time, and the construction efficiency is improved. The time window of consolidation drainage is prolonged, and the construction period is remarkably shortened.

Description

Technical Field

[0001] The invention relates to the technical field of road engineering construction, and in particular to an embankment structure based on physical and chemical composite modified shield mud and a construction method of the embankment structure. Background Art

[0002] As a special engineering waste generated in slurry shield engineering, shield engineering mud has a huge output. Due to the high water content of mud, it contains a large amount of suspended matter and fine soil. Direct discharge will cause serious pollution to the environment. The use of mud tankers for transportation is not only inefficient and costly, but also causes secondary pollution during transportation. Therefore, it is particularly important to dehydrate and recycle shield mud.

[0003] In the related technology, there are some schemes that realize the resource utilization of shield mud as embankment filling. However, these schemes are not very operational, and the formed embankment needs to be built with cofferdams on both sides to prevent mud leakage. In addition, the existing construction scheme requires multi-layer segmented construction, and the construction scheme cannot be carried out continuously, which not only increases the construction cost, but also shortens the time window for consolidation and drainage. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to propose an embankment structure based on a physical and chemical composite modified shield mud, which has strong operability, low construction cost and short construction period.

[0005] The present invention further proposes a construction method for an embankment structure based on physical and chemical composite modified shield mud.

[0006] The embankment structure based on the physical and chemical composite modified shield mud according to the present invention includes: a plurality of geotubes, which are stacked and arranged above the soil foundation along the height direction of the embankment structure, and are filled with a mixed slurry of a curing agent, a flocculant, and the shield mud; a plurality of connecting belts, each of which is connected between every two adjacent geotubes; and a plurality of drainage components, each of which is provided with the drainage component, and the drainage component is connected to the outside of the geotube, so that the moisture in the mixed slurry can be discharged from the geotube through the drainage component.

[0007] According to the embankment structure based on the physical and chemical composite modified shield mud of the present invention, a plurality of geotubes are arranged, and the geotubes are filled with a mixed slurry of a curing agent, a flocculant, and shield mud. There is no need to build cofferdams on both sides of the embankment in advance, which greatly saves construction costs and improves construction convenience. In addition, this solution can consolidate and drain the mixed slurry in a plurality of geotubes at the same time, thereby extending the time window for consolidation and drainage and significantly shortening the construction period.

[0008] In some examples of the present invention, the drainage assembly includes: a plurality of drainage boards, the plurality of drainage boards are arranged at intervals along a first direction, and the plurality of drainage boards are all connected to the outside of the geotube.

[0009] In some examples of the present invention, the drainage component also includes: a plurality of joints, the geotube bag has a plurality of drainage holes, and along the extension direction of the drainage board, both ends of the drainage board are connected with the joints, the number of the joints is the same as the number of the drainage holes and corresponds one to one, and the joints are inserted into the corresponding drainage holes to connect the drainage board with the outside of the geotube bag.

[0010] In some examples of the present invention, the drainage assembly also includes: a plurality of fixing ropes, each of the drainage boards having a plurality of fixing holes arranged at intervals along its length direction, the number of the fixing ropes being the same as the number of the fixing holes and corresponding one to one, the fixing ropes being passed through the corresponding fixing holes, and the two ends of the fixing ropes being respectively connected to the two opposite inner walls of the geotube bag.

[0011] In some examples of the present invention, the geotube has a slurry filling port, and the mixed slurry is filled into the geotube through the slurry filling port.

[0012] In some examples of the present invention, the curing agent includes at least one of silicate cement, blast furnace slag powder, and lime powder; and / or the flocculant includes at least one of polyacrylamide, polyaluminium chloride, and calcium hydroxide.

[0013] In some examples of the present invention, the material of the geotube includes synthetic fibers; and / or the wall thickness of the geotube is A, satisfying the relationship: 1 mm ≤ A ≤ 10 mm.

[0014] In some examples of the present invention, the material of the connecting belt is geosynthetics, and the geosynthetics include at least one of geogrids, geotextiles or geonets; and / or the thickness of the connecting belt is B, satisfying the relationship: 1.5mm≤B≤4mm.

[0015] According to the construction method of the embankment structure based on the physical and chemical composite modified shield mud of the present invention, the embankment structure comprises: a plurality of geotubes, which are stacked along the height direction of the embankment structure, and the geotubes are filled with a mixed slurry of a curing agent, a flocculant, and the shield mud; a plurality of connecting belts, each of which is connected between two adjacent geotubes; a plurality of drainage components, each of which is provided with the drainage component, the drainage component is connected to the outside of the geotube, and the water in the mixed slurry can be discharged from the geotube through the drainage component; the construction method comprises:

[0016] Laying a plurality of the geotubes in sequence along the height direction of the embankment structure;

[0017] Connecting the drainage assembly to a drainage pipe disposed outside the geotube;

[0018] Filling the mixed slurry into the geotube bag;

[0019] Connect the drain pipe to the water-gas separation tank, and connect the vacuum pump to the water-gas separation tank;

[0020] Laying a sealing membrane on the outside of the plurality of geotube bags;

[0021] A load was applied to the top of the uppermost geotube and the vacuum pump was started.

[0022] According to the construction method of the embankment structure based on the physical and chemical composite modified shield mud of the present invention, a plurality of geotubes are set up, and the geotubes are filled with a mixed slurry of a curing agent, a flocculant, and shield mud. There is no need to build cofferdams on both sides of the embankment in advance, which greatly saves construction costs and improves construction convenience. In addition, this solution can consolidate and drain the mixed slurry in a plurality of geotubes at the same time, thereby extending the time window for consolidation and drainage and significantly shortening the construction period.

[0023] In some examples of the present invention, the geotube has a slurry filling port, and the mixed slurry is filled into the geotube through the slurry filling port;

[0024] After the mixed slurry is filled into the geotube bag, the slurry filling port is flattened, folded and sewed.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 is a formal perspective schematic diagram of an embankment structure based on a physical and chemical composite modified shield mud according to an embodiment of the present invention;

[0028] Figure 2 is a top perspective schematic diagram of an embankment structure based on physical and chemical composite modified shield mud according to an embodiment of the present invention;

[0029] Figure 3 It is a flow chart of a construction method of an embankment structure based on physical and chemical composite modified shield mud according to an embodiment of the present invention.

[0030] Reference numerals:

[0031] Embankment structures 100;

[0032] Soil base 1; non-woven geotextile 2; anti-seepage geomembrane 3; mixed slurry 4; geotube 5; mud filling port 6; drainage hole 7; drainage assembly 8; drainage board 9; joint 10; fixing rope 11; drainage pipe 12; connecting belt 13; sealing membrane 14; sealing ditch 15; drainage hose 16; water-gas separation tank 17; vacuum pump 18; water bag 19. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] Reference below Figure 1-Figure 3 An embankment structure 100 based on physical and chemical composite modified shield slurry according to an embodiment of the present invention is described.

[0035] like Figure 1-Figure 3 As shown, the embankment structure 100 according to the embodiment of the present invention includes: a geotube 5 , a connecting belt 13 and a drainage component 8 .

[0036] Along the height direction of the embankment structure 100 (i.e. Figure 1 In the Z direction as shown in the figure, a plurality of geotubes 5 are stacked and arranged above the soil base 1, and the geotubes 5 are filled with a mixed slurry 4 of a curing agent, a flocculant and a shield mud; a connecting belt 13 is connected between each two adjacent geotubes 5; a drainage component 8 is provided in each geotube 5, and the drainage component 8 is connected to the outside of the geotube 5, so that the moisture in the mixed slurry 4 can be discharged from the geotube 5 through the drainage component 8.

[0037] The number of geotubes 5 can be multiple, and the number of geotubes 5 can be but not limited to four, six, eight, etc. As some embodiments of the present application, the number of geotubes 5 is eight, along the height direction of the embankment structure 100 (i.e. Figure 1 A plurality of geotubes 5 are stacked and arranged above the soil base 1, and the geotubes 5 are filled with a mixed slurry 4 of a curing agent, a flocculant, and a shield mud.

[0038] The number of connecting belts 13 can be multiple, and the number of connecting belts 13 can be but not limited to four, six, eight, etc. As some embodiments of the present application, the number of connecting belts 13 is seven, and each two adjacent geotubes 5 are connected with a connecting belt 13, which can enhance the interlayer friction and integrity of the multiple geotubes 5.

[0039] The number of drainage components 8 can be multiple, and the number of drainage components 8 can be but not limited to four, six, eight, etc. As some embodiments of the present application, the number of drainage components 8 is eight, and each geotube 5 is provided with a drainage component 8, and the drainage component 8 is connected to the outside of the geotube 5, and the moisture in the mixed slurry 4 can be discharged from the geotube 5 through the drainage component 8.

[0040] As some embodiments of the present application, Figure 1 and Figure 2 As shown, during the construction of the embankment structure 100 based on the physical and chemical composite modified shield mud, the following can be used: drainage pipe 12, drainage hose 16, sealing membrane 14, water-gas separation tank 17, vacuum pump 18, quick-plug connector, the embankment structure 100 based on the physical and chemical composite modified shield mud also includes a non-woven geotextile 2 and an impermeable geomembrane 3. During the construction of the embankment structure 100, the top surface of the soil base 1 can be cleaned, leveled and rolled first, and the non-woven geotextile 2 with good water permeability and puncture resistance and the impermeable geomembrane 3 with chemical corrosion resistance are laid in sequence on the surface of the compacted and leveled soil base 1, so as to ensure that the non-woven geotextile 2 and the impermeable geomembrane 3 are flat, wrinkle-free and have good sealing properties, and then the embankment structure 100 is laid along the height direction (i.e. Figure 1 A plurality of geotube bags 5 are laid in sequence (in the Z direction shown in the figure), and a connecting belt 13 is provided between the upper and lower adjacent geotube bags 5. As some embodiments of the present application, the connecting belt 13 can be sutured and connected to the surface material of the geotube bag 5 by a handheld suturing machine, thereby ensuring the firmness of the connection between the connecting belt 13 and the geotube bag 5.

[0041] Then, the drainage component 8 is connected to the drainage pipe 12 arranged outside the geotube bag 5. As some embodiments of the present application, when the drainage component 8 is connected to the drainage pipe 12, one drainage pipe 12 can correspond to one geotube bag 5. As some embodiments of the present application, when the drainage component 8 is connected to the drainage pipe 12, one drainage pipe 12 can correspond to multiple geotube bags 5. As some embodiments of the present application, the material of the drainage pipe 12 can be but is not limited to PVC, etc.

[0042] Next, the mixed slurry 4 can be filled into the geotube 5. As some embodiments of the present application, the geotube 5 has a mud filling port 6. The pumping pipe of the mixed slurry 4 can be inserted into the mud filling port 6 and fastened and fixed by a binding belt to allow the mixed slurry 4 to be filled into the geotube 5 through the mud filling port 6. As some embodiments of the present application, the mixing machinery at the construction site can mix and stir the shield mud with the curing agent and the flocculant in sequence for physical and chemical composite modification treatment (the mixed slurry 4 is formed by adding the curing agent and the flocculant to the shield mud in turn and stirring them evenly in sequence). After the mixing and stirring is completed, it is transported to the geotube 5 through a pumping pipe to complete the filling work.

[0043] The drain pipe 12 is connected to the water-gas separation tank 17, and the vacuum pump 18 is connected to the water-gas separation tank 17. As some embodiments of the present application, the drain pipe 12 is connected to the water-gas separation tank 17 through a drain hose 16. As some embodiments of the present application, the water-gas separation tank 17 is connected to the vacuum pump 18 through a pneumatic air compressor pipe and a quick-connect connector.

[0044] Finally, a sealing film 14 is laid on the outside of the multiple geotubes 5. As some embodiments of the present application, the lateral sides of the embankment structure 100 include sealing trenches 15. The sealing film 14 is laid along the slope constructed by the multiple geotubes 5 to the sealing trenches 15 on the lateral sides of the embankment structure 100. That is to say, a layer of sealing film 14 is laid on the surface of the embankment structure 100. By burying the sealing film 14 and the drainage hose 16 in the sealing trench 15 and backfilling, the sealing effect can be ensured. A load is applied to the top of the topmost geotube 5, and the vacuum pump 18 is started for vacuum filtration. As some embodiments of the present application, a load can be applied by stacking a water bag 19 with an impermeable surface on the top of the embankment structure 100, and the vacuum pump 18 is started for vacuum filtration. The combined effect of stacking and vacuum preloading is formed by the deadweight of the water bag 19, which can greatly improve the rate and degree of consolidation drainage.

[0045] As some embodiments of the present application, after the vacuum filtration is completed, the sealing film 14 on the surface of the embankment structure 100 is opened for natural storage and curing. The curing time may be, but is not limited to, 28 days or more to ensure that the strength performance of the mixed mud in the geotube 5 is greatly improved. As some embodiments of the present application, after the curing is completed, a slope protection structure may be set on the slope of the embankment structure 100. The slope protection structure may be, but is not limited to, geonets, vegetation, gabions, or precast concrete blocks, etc., so as to prevent slope erosion. As some embodiments of the present application, in order to protect the structure below the embankment structure 100 from environmental influences, a covering layer may be set on the top of the embankment structure 100. The covering layer may be, but is not limited to, an asphalt or concrete layer.

[0046] It should be noted that the embankment structure 100 based on the physical and chemical composite modified shield mud of the present application can effectively solve the problem of the difficulty in the final disposal of a large amount of abandoned shield engineering mud (including the high cost of shield mud transportation and the environmental pollution caused by the direct disposal of shield mud), while realizing the high added value reuse of shield engineering mud, and can greatly improve the construction continuity, extend the consolidation drainage window period of the flocculated and solidified mud, and significantly shorten the construction period.

[0047] Therefore, by setting up multiple geotube bags 5 and filling the geotube bags 5 with a mixed slurry 4 of a curing agent, a flocculant, and shield mud, there is no need to build cofferdams on both sides of the embankment in advance, which greatly saves construction costs and improves construction convenience. In addition, this solution can consolidate and drain the mixed slurry 4 in multiple geotube bags 5 at the same time, extending the time window for consolidation and drainage and significantly shortening the construction period.

[0048] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the drainage assembly 8 includes: a plurality of drainage boards 9, the plurality of drainage boards 9 are arranged along a first direction (ie Figure 2 The plurality of drainage boards 9 are arranged at intervals (in the X direction as shown), and are all connected to the outside of the geotube 5.

[0049] The number of the drain plates 9 may be multiple, and the number of the drain plates 9 may be, but is not limited to, four, six, eight, etc. As some embodiments of the present application, the number of the drain plates 9 is eight, and the eight drain plates 9 are arranged along the first direction (i.e. Figure 2 The eight drainage boards 9 are arranged at intervals (in the X direction shown in the figure), and the eight drainage boards 9 are all connected to the outside of the geotube 5 (for example, the eight drainage boards 9 are all connected to the drainage pipe 12).

[0050] As some embodiments of the present application, each of two adjacent drainage boards 9 is along the first direction (i.e. Figure 2The distance between the drainage boards 9 and the drainage boards 9 is C, and C satisfies the relationship: 0.5m≤C≤0.8m, that is, every two adjacent drainage boards 9 are arranged along the first direction (i.e. Figure 2 The spacing distance between the drainage boards 9 along the first direction (ie, the X direction shown in FIG. 1 ) can be any value between 0.5 m and 0.8 m. For example, each adjacent two drainage boards 9 are arranged along the first direction (ie, Figure 2 The spacing distance (in the X direction shown) is 0.5m.

[0051] As some embodiments of the present application, the drainage pipe 12 outside the geotube 5 can be tensioned to keep the drainage board 9 in a horizontal state during the process of filling the mixed slurry 4 into the geotube 5. This arrangement is conducive to improving the filling efficiency.

[0052] By making the drainage assembly 8 include a plurality of drainage plates 9, and making the plurality of drainage plates 9 along the first direction (i.e. Figure 2 The geotube 5 is arranged in an interval manner (in the X direction shown in the figure) and is connected to the outside of the geotube 5, so that the drainage component 8 can be reasonably arranged, and the geotube 5 can be folded along the length direction, which is convenient for the transportation and storage of the geotube 5. In addition, such an arrangement can facilitate the discharge of water in the mixed slurry 4, which can improve the drainage efficiency, help reduce the difficulty of construction, and improve the continuity of construction.

[0053] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the drainage assembly 8 also includes: a plurality of joints 10, the geotube 5 has a plurality of drainage holes 7, and the drainage board 9 extends in the direction (i.e. Figure 1 The drain board 9 is connected to the outside of the geotube 5 (for example, the drain board 9 is connected to the drain pipe 12, so that the drain board 9 is connected to the outside of the geotube 5).

[0054] The drainage assembly 8 further includes a joint 10. As some embodiments of the present application, the joint 10 may be, but is not limited to, a hand-shaped joint. Figure 1 The drain plate 9 is connected to a joint 10 at both ends, and the number of the joints 10 may be multiple, but not limited to four, six, eight, etc., that is, the number of the joints 10 is twice the number of the drain plate 9, and the geotube 5 has drainage holes 7, and the number of the drainage holes 7 may be multiple, but not limited to four, six, eight, etc. Moreover, the number of the joints 10 is the same as that of the drainage holes 7 and they are arranged one by one, and the joints 10 can be inserted into the corresponding drainage holes 7 to connect the drain plate 9 with the outside of the geotube 5.

[0055] Such an arrangement can make the drainage component 8 arranged reasonably, can facilitate the connection between the drainage board 9 and the outside of the geotube 5, can reduce the difficulty of assembling the drainage component 8, improve the convenience of construction, reduce the construction time, and reduce the difficulty of construction.

[0056] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the drainage assembly 8 also includes: a plurality of fixing ropes 11, each drainage board 9 has a plurality of fixing ropes 11 along its length direction (ie Figure 2 The fixing ropes 11 are arranged in the same number as the fixing holes and correspond to each other one by one. The fixing ropes 11 are passed through the corresponding fixing holes, and the two ends of the fixing ropes 11 are respectively connected to the two opposite inner walls of the geotube 5.

[0057] The drainage assembly 8 further includes a fixing rope 11, the number of which may be multiple, the number of which may be multiple, the number of which may be but not limited to four, six, eight, etc., the drainage board 9 has a fixing hole, the number of which is multiple, the number of which is the same as the number of the fixing holes of the multiple drainage boards 9 included in each drainage assembly 8, and the number of fixing ropes 11 included in each drainage assembly 8 is one-to-one corresponding to the number of the multiple fixing holes of the multiple drainage boards 9 included in each drainage assembly 8. As some embodiments of the present application, each of the eight drainage boards 9 has a fixing hole along its length direction (i.e., Figure 2 There are six fixing holes arranged at intervals (in the Y direction shown in the figure), forty-eight fixing ropes 11 are passed through the corresponding fixing holes, and the two ends of the fixing ropes 11 are respectively connected to the two opposite inner walls of the geotube 5. The two opposite inner walls of the geotube 5 can also be understood as the top wall and the bottom wall of the geotube 5.

[0058] As some embodiments of the present application, the interval between the fixed holes is but not limited to 1 m.

[0059] By passing a plurality of fixing ropes 11 through the fixing holes of the drainage board 9 and connecting them to the two opposite inner walls of the geotube bag 5, the design of the geotube bag 5 can be made simple and reasonable, and the drainage board 9 can be reliably fixed in the geotube bag 5 and suspended in the geotube bag 5, so that the setting position of the drainage board 9 is reasonable, which is beneficial to improving the drainage efficiency of the drainage assembly 8.

[0060] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the geotube 5 has a mud filling port 6, and the mixed slurry 4 is filled into the geotube 5 through the mud filling port 6. By providing the geotube 5 with the mud filling port 6, the mixed slurry 4 can be inserted into the mud filling port 6 through a pumping pipe for filling, which can improve the filling efficiency and is beneficial to improving the reliability of the use of the geotube 5.

[0061] As some embodiments of the present application, along the first direction (i.e. Figure 2 The mud filling port 6 is located at an oblique angle on one side of the geotube 5, so that the mud filling port 6 can be reasonably positioned, making it easy to insert the pumping pipe into the mud filling port 6.

[0062] In some embodiments of the present invention, the curing agent includes at least one of silicate cement, blast furnace slag powder, and lime powder; and / or the flocculant includes at least one of polyacrylamide, polyaluminium chloride, and calcium hydroxide.

[0063] The curing agent may include one of silicate cement, blast furnace slag powder, and lime powder, or the curing agent may include multiple of silicate cement, blast furnace slag powder, and lime powder.

[0064] As some embodiments of the present application, the curing agent may include silicate cement, as some embodiments of the present application, the curing agent may include blast furnace slag powder, as some embodiments of the present application, the curing agent may include silicate cement and blast furnace slag powder, as some embodiments of the present application, the curing agent may include blast furnace slag powder and lime powder, as some embodiments of the present application, the curing agent may include silicate cement, blast furnace slag powder and lime powder. In this way, the type of curing agent can be selected according to actual needs, increasing the selectivity of the curing agent.

[0065] The flocculant may include one of polyacrylamide, polyaluminium chloride and calcium hydroxide, or the flocculant may include multiple ones of polyacrylamide, polyaluminium chloride and calcium hydroxide.

[0066] As some embodiments of the present application, the flocculant may include polyacrylamide, as some embodiments of the present application, the flocculant may include polyaluminium chloride, as some embodiments of the present application, the flocculant may include polyacrylamide and polyaluminium chloride, as some embodiments of the present application, the flocculant may include polyaluminium chloride and calcium hydroxide, as some embodiments of the present application, the flocculant may include polyacrylamide, polyaluminium chloride and calcium hydroxide. In this way, the type of flocculant can be selected according to actual needs, increasing the selectivity of the flocculant.

[0067] In some embodiments of the present invention, the material of the geotube 5 includes synthetic fibers; and / or the wall thickness of the geotube 5 is A, satisfying the relationship: 1 mm ≤ A ≤ 10 mm.

[0068] The synthetic fiber may be, but is not limited to, polyester fiber, nylon, acrylic fiber, etc. As some embodiments of the present application, the material of the geotube 5 includes synthetic fiber, and the synthetic fiber is nylon.

[0069] The wall thickness of the geotube 5 is A, and A can satisfy the relationship: 1mm≤A≤10mm, that is, the wall thickness of the geotube 5 can be any value between 1mm and 10mm, for example, the wall thickness of the geotube 5 can be but not limited to 1mm, 5mm, 10mm, etc. As some embodiments of the present application, the wall thickness of the geotube 5 is 5mm.

[0070] By making the material of the geotube 5 include synthetic fibers, the geotube 5 can be conveniently folded for transportation and storage. By making the wall thickness of the geotube 5 any value between 1 mm and 10 mm, the wall thickness of the geotube 5 can be made reasonable, thereby reducing the risk of tearing of the geotube 5 and preventing the geotube 5 from being too thick, thereby accommodating more mixed slurry 4.

[0071] In some embodiments of the present invention, the material of the connecting belt 13 is geosynthetics, and the geosynthetics include at least one of geogrids, geotextiles or geonets; and / or, the thickness of the connecting belt 13 is B, satisfying the relationship: 1.5mm≤B≤4mm.

[0072] The geosynthetic material may include one of a geogrid, a geotextile or a geonet, or the geosynthetic material may include a combination of geogrids, geotextiles or geonets.

[0073] As some embodiments of the present application, the geosynthetics may include geogrids, as some embodiments of the present application, the geosynthetics may include geotextiles, as some embodiments of the present application, the geosynthetics may include geonets, as some embodiments of the present application, the geosynthetics may include geonets and geotextiles, as some embodiments of the present application, the geosynthetics may include geogrids and geotextiles, as some embodiments of the present application, the geosynthetics may include geogrids, geotextiles and geonets.

[0074] The thickness of the connecting belt 13 is B, and B can satisfy the relationship: 1.5 mm ≤ B ≤ 4 mm, that is, the thickness of the connecting belt 13 can be any value between 1.5 mm and 4 mm, for example, the thickness of the connecting belt 13 can be but not limited to 1.5 mm, 3 mm, 4 mm, etc. As some embodiments of the present application, the thickness of the connecting belt 13 can be 3 mm.

[0075] By making the material of the connecting belt 13 a geosynthetic material and allowing the thickness of the connecting belt 13 to be any value between 1.5 mm and 4 mm, the material and thickness of the connecting belt 13 can be made reasonable, thereby enhancing the interlayer friction and integrity of the geotube bag 5 of the embankment structure 100, which is beneficial to improving the reliability of the embankment structure 100.

[0076] Figure 3The present invention is a flow chart of a construction method of an embankment structure based on a physical and chemical composite modified shield mud according to an embodiment of the present invention. The embankment structure includes: a plurality of geotubes, which are stacked along the height direction of the embankment structure, and the geotubes are filled with a mixed slurry of a curing agent, a flocculant, and shield mud; a plurality of connecting belts, and each adjacent two geotubes are connected with a connecting belt; a plurality of drainage components, each geotube is provided with a drainage component, and the drainage component is connected to the outside of the geotube, and the water in the mixed slurry can be discharged from the geotube through the drainage component; Figure 3 As shown, the construction method comprises the following steps:

[0077] S1, laying multiple geotubes in sequence along the height direction of the embankment structure;

[0078] As some embodiments of the present application, the following can be applied in the construction process of the embankment structure based on the physical and chemical composite modified shield mud: drainage pipes, water-gas separation tanks, quick-connect connectors, drainage hoses, vacuum pumps and sealing membranes. In the construction process of the embankment structure, the top surface of the soil base can be cleaned, leveled and rolled first, and a non-woven geotextile with good water permeability and puncture resistance and an anti-chemical corrosion geomembrane can be laid on the compacted and leveled soil base surface in turn. This can ensure that the non-woven geotextile and the anti-seepage geomembrane are flat, wrinkle-free and have good sealing properties, and then the geotextile and the anti-seepage geomembrane are laid along the height direction of the embankment structure (i.e., the height direction of the embankment structure) as required. Figure 1 Multiple geotubes are laid in sequence (in the Z direction shown), and connecting belts are provided between the upper and lower adjacent geotubes. As some embodiments of the present application, the connecting belts can be sutured and connected to the surface material of the geotubes by a handheld suturing machine, thereby ensuring the firmness of the connection between the connecting belts and the geotubes.

[0079] S2, connecting the drainage assembly to the drainage pipe provided outside the geotube;

[0080] As some embodiments of the present application, when the drainage component is connected to the drainage pipe, one drainage pipe may correspond to one geotube bag. As some embodiments of the present application, when the drainage component is connected to the drainage pipe, one drainage pipe may correspond to multiple geotube bags. As some embodiments of the present application, the material of the drainage pipe may be but is not limited to PVC, etc.

[0081] S3, filling the geotube bag with the mixed slurry;

[0082] As some embodiments of the present application, the geotube has a mud filling port, and a pumping pipe of the mixed slurry can be inserted into the mud filling port and fastened with a binding belt to allow the mixed slurry to be filled into the geotube through the mud filling port. As some embodiments of the present application, the mixing machinery at the construction site can mix and stir the shield mud with the curing agent and the flocculant in sequence for physical and chemical composite modification treatment. After the mixing and stirring is completed, it is transported to the geotube through a pumping pipe to complete the filling work.

[0083] S4, connecting the drain pipe to the water-gas separation tank, and connecting the vacuum pump to the water-gas separation tank;

[0084] As some embodiments of the present application, the drain pipe is connected to the water-gas separation tank through a drain hose. As some embodiments of the present application, the water-gas separation tank is connected to a vacuum pump through a pneumatic air compressor pipe and a quick-connect connector.

[0085] It should be noted that there is no order among step S2, step S3 and step S4, and they can be performed in the order of step S2, step S3 and step S4, or in any order. As some embodiments of the present application, in step S3, multiple geotubes can be filled sequentially or simultaneously.

[0086] S5, laying a sealing membrane on the outside of multiple geotubes;

[0087] As some embodiments of the present application, the embankment structure includes sealing trenches on both sides in the transverse direction, and the sealing membrane is laid along the slope of the embankment structure constructed by multiple geotubes all the way to the sealing trenches on both sides in the transverse direction of the embankment structure. In other words, a layer of sealing membrane is laid on the surface of the embankment structure, and the sealing membrane and the drainage hose are buried in the sealing trench and backfilled to ensure the sealing effect.

[0088] S6, apply a load on the top of the uppermost geotube and start the vacuum pump.

[0089] As some embodiments of the present application, a load can be applied by stacking impermeable water bags on top of the embankment structure, and a vacuum pump is started to perform vacuum filtration. The dead weight of the water bags can form a combined loading-vacuum preloading effect, which can greatly improve the rate and degree of consolidation drainage.

[0090] As some embodiments of the present application, after the vacuum filtration is completed, the sealing film on the surface of the embankment structure is opened and natural storage maintenance is carried out. The maintenance time can be but not limited to 28 days or more to ensure that the strength performance of the mixed mud in the geotube bag is greatly improved. As some embodiments of the present application, after the maintenance is completed, a slope protection structure can be set on the slope of the embankment structure. The slope protection structure can be but not limited to geonets, vegetation, gabions or precast concrete blocks, etc., which can prevent slope erosion. As some embodiments of the present application, in order to protect the structure below the embankment structure from environmental influences, a covering layer can be set on the top of the embankment structure. The covering layer can be but not limited to asphalt or concrete layer.

[0091] Therefore, by setting up multiple geotubes and filling the geotubes with a mixed slurry of curing agent, flocculant and shield mud, there is no need to build cofferdams on both sides of the embankment in advance, which greatly saves construction costs and improves construction convenience. In addition, this solution can consolidate and drain the mixed slurry in multiple geotubes at the same time, extending the time window for consolidation and drainage and significantly shortening the construction period.

[0092] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the geotube has a mud filling port, and the mixed slurry is filled into the geotube through the mud filling port; after the mixed slurry is filled into the geotube, the mud filling port is flattened, folded and sewed.

[0093] It is understandable that after the mixed slurry is filled into the geotube bag, the drainage pipe can be loosened, the mud filling port can be flattened and folded to perform multiple sutures, which can reduce the probability of mud leakage.

[0094] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0095] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0096] In the description of the present invention, "plurality" means two or more.

[0097] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0098] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0099] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0100] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An embankment structure based on physical and chemical composite modified shield mud, characterized in that: include: A plurality of geotubes are stacked and arranged above the soil foundation along the height direction of the embankment structure, and the geotubes are filled with a mixed slurry of a curing agent, a flocculant, and the shield mud; A plurality of connecting belts, each of which is connected between two adjacent geotube bags; A plurality of drainage components are provided in each geotube bag, and the drainage component is communicated with the outside of the geotube bag, so that the water in the mixed slurry can be discharged from the geotube bag through the drainage component.

2. The embankment structure based on the physical and chemical composite modified shield mud according to claim 1 is characterized in that: The drainage assembly includes: a plurality of drainage boards, the plurality of drainage boards are arranged at intervals along a first direction, and the plurality of drainage boards are all connected to the outside of the geotube bag.

3. The embankment structure based on the physical and chemical composite modified shield mud according to claim 2 is characterized in that: The drainage component also includes: multiple joints, the geotube bag has multiple drainage holes, and along the extension direction of the drainage board, both ends of the drainage board are connected with the joints, the number of the joints is the same as the number of the drainage holes and they correspond one to one, and the joints are inserted into the corresponding drainage holes to connect the drainage board with the outside of the geotube bag.

4. The embankment structure based on the physical and chemical composite modified shield mud according to claim 2 is characterized in that: The drainage assembly also includes: a plurality of fixing ropes, each of the drainage boards having a plurality of fixing holes arranged at intervals along its length direction, the number of the fixing ropes being the same as the number of the fixing holes and corresponding one to one, the fixing ropes being passed through the corresponding fixing holes, and the two ends of the fixing ropes being respectively connected to the two opposite inner walls of the geotube bag.

5. The embankment structure based on the physical and chemical composite modified shield mud according to claim 1 is characterized in that: The geotube bag has a mud filling port, and the mixed slurry is filled into the geotube bag through the mud filling port.

6. The embankment structure based on the physical and chemical composite modified shield mud according to claim 1 is characterized in that: The curing agent includes at least one of silicate cement, blast furnace slag powder and lime powder; And / or, the flocculant includes at least one of polyacrylamide, polyaluminium chloride and calcium hydroxide.

7. The embankment structure based on the physical and chemical composite modified shield mud according to claim 1 is characterized in that: The material of the geotube bag includes synthetic fibers; And / or, the wall thickness of the geotube is A, satisfying the relationship: 1mm≤A≤10mm.

8. The embankment structure based on physical and chemical composite modified shield mud according to claim 1 is characterized in that: The material of the connecting belt is geosynthetics, and the geosynthetics include at least one of geogrid, geotextile or geonet; And / or, the thickness of the connecting belt is B, satisfying the relationship: 1.5mm≤B≤4mm.

9. A construction method for an embankment structure based on physical and chemical composite modified shield mud, characterized in that: The embankment structure comprises: a plurality of geotubes, which are stacked in a height direction of the embankment structure, and are filled with a mixed slurry of a curing agent, a flocculant, and the shield mud; a plurality of connecting belts, and each adjacent two geotubes are connected with the connecting belt; a plurality of drainage components, and each geotube is provided with the drainage component, and the drainage component is connected to the outside of the geotube, so that the water in the mixed slurry can be discharged from the geotube through the drainage component; The construction method comprises: Laying a plurality of the geotubes in sequence along the height direction of the embankment structure; Connecting the drainage assembly to a drainage pipe disposed outside the geotube; Filling the mixed slurry into the geotube bag; Connect the drain pipe to the water-gas separation tank, and connect the vacuum pump to the water-gas separation tank; Laying a sealing membrane on the outside of the plurality of geotube bags; A load was applied to the top of the uppermost geotube and the vacuum pump was started.

10. The construction method of embankment structure based on physical and chemical composite modified shield mud according to claim 9, characterized in that: The geotube bag has a mud filling port, and the mixed slurry is filled into the geotube bag through the mud filling port; After the mixed slurry is filled into the geotube bag, the slurry filling port is flattened, folded and sewed.

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