A reinforced soil column support device, an assembled earth-filled embankment structure and a construction method

Abstract

The present invention provides a reinforced soil column support device, a prefabricated embankment structure and a construction method. Among them, the prefabricated embankment structure includes a plurality of reinforced soil columns, a lower cushion layer and an upper cushion layer. The plurality of reinforced soil columns are arranged side by side on the lower cushion layer, and the axis of each reinforced soil column is arranged in the vertical direction. Each reinforced soil column includes a top plate, a bottom plate, a mesh bag and bearing soil. The top plate and the bottom plate are opposite and spaced apart along the axis, the bearing soil is arranged between the top plate and the bottom plate, the mesh bag is wrapped outside the top plate, the bottom plate and the bearing soil, and the bearing soil in the mesh bag can be tightly compacted by the top plate and the bottom plate; the upper end surfaces of the plurality of reinforced soil columns are aligned with each other, and the upper cushion layer is laid on the upper ends of the plurality of reinforced soil columns to form a horizontal or inclined surface; the modularization of the structure of the present invention can bring a longer engineering structure life cycle, can achieve fine assembly, can improve the engineering quality and enhance the engineering construction efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of subgrade construction engineering. Specifically, it relates to a reinforced soil column support device, a prefabricated embankment structure, and a construction method thereof. Background Art

[0002] The landfill method is a commonly used foundation construction method, often using soil as the landfill material, which has been widely used in the fields of road engineering, construction engineering, etc. However, as a natural product modified artificially, the soil used as the landfill material often has various foundation engineering diseases due to the spatio-temporal variability and multiphase nature of the soil material, such as collapse, uneven settlement, cracking, sliding deformation, etc. Moreover, as a loose body, natural soil is easily affected by factors such as water bodies and environmental temperature, resulting in engineering diseases such as landslides, liquefaction, piping, sand boiling, frost heaving, and salt expansion. For this reason, engineering improvement measures such as compaction, soil modification, dewatering, reinforcement, and structural reinforcement have been adopted in the past. However, these measures often target one or several diseases and are difficult to cope with the influence of multiple potential adverse phenomena, making it difficult to fully overcome the problem of foundation diseases. Summary of the Invention

[0003] The purpose of the present invention is to solve at least one of the above-mentioned deficiencies existing in the prior art. For example, one of the purposes of the present invention is to provide a reinforced soil column support device, a prefabricated embankment structure, and a construction method thereof, so as to solve the influence of various potential diseases in the subgrade materials in the prior art and fundamentally overcome technical problems such as landslides, liquefaction, piping, sand boiling, frost heaving, and salt expansion in the existing subgrade.

[0004] To achieve the above purpose, on the one hand, the present invention provides a prefabricated embankment structure, which may include a plurality of reinforced soil columns, a lower cushion layer, and an upper cushion layer. Among them, the plurality of reinforced soil columns may be arranged side by side on the lower cushion layer, the axis of each reinforced soil column may be arranged vertically, each reinforced soil column may include a top plate, a bottom plate, a mesh bag, and bearing soil. The top plate and the bottom plate may be opposite and spaced apart along the axis, the bearing soil may be arranged between the top plate and the bottom plate, the mesh bag may be wrapped outside the top plate, the bottom plate, and the bearing soil, and the bearing soil in the mesh bag can be tightly compacted by the top plate and the bottom plate; the upper end surfaces of the plurality of reinforced soil columns may be aligned with each other, and the upper cushion layer may be laid on the upper ends of the plurality of reinforced soil columns to form a horizontal or inclined surface.

[0005] Optionally, a lifting part may be formed at the upper end of the top plate, a lifting hole may be opened on the lifting part, and the inner diameter of the lifting hole may gradually increase from top to bottom, so as to facilitate the lifting tool to be clamped into the lifting part for lifting operation of the reinforced soil column.

[0006] Optionally, the mesh bag may include a rib member and a fabric that are thermally bonded to each other. The rib member may be made of a fiber-reinforced polymer material, and the fabric may be made of a polymer woven geotextile.

[0007] Optionally, the embankment structure may further include a drainage system and a temperature control system. The drainage system may include a plurality of drain pipes, and the plurality of drain pipes may be respectively disposed in the gaps between adjacent reinforced soil columns. The lower ends thereof may penetrate through the lower cushion layer and extend below the lower cushion layer. The drainage system may be used to drain the free water in the embankment structure. The temperature control system may include a plurality of temperature control pipes, and the plurality of temperature control pipes may be respectively disposed in the gaps between adjacent reinforced soil columns. The temperature control system may be used to adjust the temperature in the embankment structure.

[0008] Optionally, the gaps between adjacent reinforced soil columns may be filled with sandy soil or gravelly soil to improve the stability of the reinforced soil columns.

[0009] Optionally, the embankment structure may further include at least one retaining wall. The retaining wall may be disposed on one side of a plurality of reinforced soil columns and is used to support the reinforced soil columns in contact therewith, and can prevent the reinforced soil columns from toppling or undergoing horizontal shear displacement. A reinforcing structure may be arranged in the upper cushion layer. The reinforcing structure may include a plurality of transverse reinforcing bars and a plurality of longitudinal reinforcing bars that are arranged crosswise. A plurality of reinforcing bar fixing ends may be buried in the retaining wall. The plurality of reinforcing bar fixing ends may be fixedly connected to the two ends of the plurality of transverse reinforcing bars and / or the two ends of the plurality of longitudinal reinforcing bars, and can anchor the reinforcing structure in the retaining wall, and can be used to stabilize the reinforced soil columns, weaken the toppling deformation and the mutual displacement deformation of the reinforced soil columns.

[0010] On the other hand, the present invention provides a reinforced soil column support device, which may include a top plate, a bottom plate, a mesh bag, and bearing soil. The top plate and the bottom plate may be arranged opposite to each other and at intervals along the axis. The bearing soil may be disposed between the top plate and the bottom plate. The mesh bag may wrap the top plate, the bottom plate, and the bearing soil, and the bearing soil in the mesh bag can be tightly compacted by the top plate and the bottom plate.

[0011] Optionally, a lifting portion may be formed at the upper end of the top plate. A lifting hole may be formed in the lifting portion, and the inner diameter of the lifting hole may gradually increase from top to bottom, so as to facilitate the lifting tool to be clamped into the lifting portion for lifting operation of the reinforced soil column support device. The mesh bag may include a rib member and a fabric that are thermally bonded to each other. The rib member may be made of a fiber-reinforced polymer material, and the fabric may be made of a polymer woven geotextile.

[0012] On the other hand, the present invention provides a construction method for an earth-filled embankment. The construction method can adopt the assembled earth-filled embankment structure described above, and can include a foundation laying link and a design, processing and installation link of the reinforced soil columns. Among them, the foundation laying link can include carrying out site excavation and leveling operations; carrying out the hoisting of the retaining wall and the construction of underground pipeline burying; laying the lower cushion layer on the site between the retaining walls and compacting or ramming it; the design, processing and installation link of the reinforced soil columns can include calculating the size of each reinforced soil column and designing the spatial arrangement mode of the reinforced soil columns; processing the reinforced soil columns with a reinforced soil column processing mold; using a lifting tool to hook into the lifting holes on the reinforced soil columns to lift the reinforced soil columns, moving them to the designated installation position, and completing the installation of the reinforced soil columns.

[0013] Optionally, the construction method can further include a drainage and temperature control system installation link and an upper cushion layer laying link. Among them, the drainage and temperature control system installation link can include burying the drain pipe and the temperature control pipe in the gaps between adjacent reinforced soil columns and filling the gaps with sandy soil or gravelly soil; the upper cushion layer laying link can include burying the reinforcing structure in the upper cushion layer, laying the upper cushion layer on the upper ends of the reinforced soil columns, and connecting the two ends of the transverse reinforcing bar and / or the longitudinal reinforcing bar to the reinforcing bar fixed ends in the retaining wall to form the overall structure of the assembled earth-filled embankment structure.

[0014] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0015] 1. Changing the main stress-bearing structure from "soil heap" to "soil column": Essentially optimizing the stress characteristics of the soil body, reducing the shear failure stress in the soil body, and avoiding the generation of tensile stress. At the same time, artificial preparation of the soil body and precise ramming overcome the shortcomings of natural soil bodies such as spatio-temporal variability and non-uniformity.

[0016] 2. The structural modularity brings a new mode of design and construction: Changing from the previous "large-scale excavation and filling" to refined assembly. Combining relevant automation and informatization technologies can not only improve the quality but also speed up the project progress.

[0017] 3. The structural modularity brings a longer engineering structure life cycle: Since the embankment of this structure is composed of piled reinforced soil columns; therefore, when the embankment and subgrade are damaged, only a few reinforced soil columns need to be replaced for rapid repair. And when the road cannot meet the traffic volume demand, it is also convenient to quickly widen the road on the basis of the existing embankment.

[0018] 4. Modularity of structure brings diversification of functions in time and space: During long-term use, roads will be affected by various external loads and external environments. The modular structure facilitates the installation of different components or the addition of environmental control equipment, greatly improving the long-term safety and stability of roads and providing a high-quality operating environment for transportation.

[0019] 5. The assembled earth-filled embankment structure of the present invention can be used in the construction of new embankment structures, as well as in the repair of roadbed damage and embankment projects in the transverse expansion of roads. Due to the excellent mechanical properties of the reinforced soil column and the modularization of the embankment structure, it has the advantages of convenience, efficiency, and good stability in these projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects and / or features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0021] Figure 1 A schematic diagram of a prefabricated earth-fill embankment structure according to an exemplary embodiment of the present invention is shown.

[0022] Figure 2 A first schematic diagram of a reinforced soil column structure according to an exemplary embodiment of the present invention is shown.

[0023] Figure 3 A second schematic diagram of a reinforced soil column structure according to an exemplary embodiment of the present invention is shown.

[0024] Figure 4 A schematic diagram showing the application of a prefabricated earth-fill embankment structure according to an exemplary embodiment of the present invention on a cut-and-fill combined embankment.

[0025] Figure 5 A schematic diagram of a processing mold for a reinforced soil column according to an exemplary embodiment of the present invention is shown.

[0026] Figure 6 A schematic diagram of a method for processing a reinforced soil column according to an exemplary embodiment of the present invention is shown.

[0027] Description of reference numerals:

[0028] 1-reinforced soil column, 11-top plate, 111-hoisting part, 112-hoisting hole, 12-bottom plate, 13-mesh bag, 131-reinforcement material, 132-surface material, 14-bearing soil, 2-lower cushion layer, 3-upper cushion layer, 4-retaining wall, 41-fixed end of tie bar, 5-surface layer, 6-drainage system, 61-drainage pipe, 7-temperature control system, 71-temperature control pipe, 8-tie bar structure, 81-transverse tie bar, 82-longitudinal tie bar. DETAILED DESCRIPTION

[0029] In the following, the reinforced soil column support device, the assembled earth-filled embankment structure and the construction method of the present invention will be described in detail with reference to exemplary embodiments.

[0030] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0031] The terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0032] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the related subgrade construction operation technology, when the soil body is used as the filling material, various foundation engineering diseases often occur due to the spatio-temporal variability and multi-phase nature of the soil body material, such as collapse, uneven settlement, cracking, sliding deformation, etc. Moreover, as a loose body, the natural soil body is easily affected by factors such as water body and environmental temperature, resulting in engineering diseases such as landslide, liquefaction, piping, sand gushing, frost damage, salt expansion, etc. For this reason, engineering improvement measures such as compaction, soil modification, dewatering, reinforcement, and structural reinforcement have been adopted in the past. However, these measures often target one or several diseases and are difficult to cope with the influence of multiple potential adverse phenomena, making it difficult to fully overcome the problem of foundation diseases.

[0034] Based on this, the present invention provides a reinforced soil column support device, a prefabricated embankment structure and a construction method. The prefabricated embankment structure includes a plurality of reinforced soil columns, a lower cushion layer and an upper cushion layer. The plurality of reinforced soil columns are arranged side by side on the lower cushion layer, and the axis of each reinforced soil column is arranged vertically. Each reinforced soil column includes a top plate, a bottom plate, a mesh bag and bearing soil. The top plate and the bottom plate are opposite and spaced along the axis, the bearing soil is arranged between the top plate and the bottom plate, and the mesh bag wraps outside the top plate, the bottom plate and the bearing soil. The bearing soil in the mesh bag can be tightly compacted by the top plate and the bottom plate; the upper end faces of the plurality of reinforced soil columns are aligned with each other, and the upper cushion layer is laid on the upper ends of the plurality of reinforced soil columns to form a horizontal or inclined surface.

[0035] The prefabricated embankment structure of the present invention changes the main stress-bearing structure from a "soil heap" to a "soil column": essentially optimizing the stress characteristics of the soil mass and reducing the influence of the natural spatio-temporal variability, non-uniformity and other disadvantages of the soil mass on the stability of the embankment structure; the structural modularity brings a new model for design and construction: changing from the previous "large-scale excavation and filling" to refined assembly. Combining relevant automation and informatization technologies can improve both quality and project speed; the modularity of the structure brings a longer engineering structure life cycle: since the embankment of this structure is composed of stacked reinforced soil columns; therefore, when the embankment or subgrade is damaged, only a few reinforced soil columns need to be replaced for rapid repair. And when the road cannot meet the traffic volume demand, it is also convenient to expand the road on the basis of the existing embankment; the modularity of the structure brings the diversification of functions in space and time: during the long-term use of the road, it will be affected by various external loads and external environments. The modular structure can greatly improve the long-term safety and stability of the road and provide a high-quality operation environment for traffic by installing different components or adding environmental control equipment; the prefabricated embankment structure of the present invention can be used not only in the construction project of a new embankment structure, but also in the subgrade disease repair project and the embankment project in the lateral expansion of the road. Due to the excellent mechanical properties of the reinforced soil column and the modularity of the embankment structure, it has the advantages of convenience, speed and good effect in these projects.

[0036] Exemplary Embodiment 1

[0037] This exemplary embodiment provides a prefabricated embankment structure.

[0038] Figure 1 The schematic diagram of the prefabricated embankment structure of the exemplary embodiment of the present invention is shown; Figure 2 The first schematic diagram of the reinforced soil column structure of the exemplary embodiment of the present invention is shown; Figure 3 The second schematic diagram of the reinforced soil column structure of the exemplary embodiment of the present invention is shown; Figure 4 The application schematic diagram of the prefabricated embankment structure of the exemplary embodiment of the present invention on a combined cutting and filling embankment is shown.

[0039] As Figures 1 to 4 shown, the assembled earth-filled embankment structure described in this exemplary embodiment may include a plurality of reinforced soil columns 1, a lower cushion layer 2, and an upper cushion layer 3. Among them, the lower cushion layer 2 may be located at the bottommost layer of the assembled earth-filled embankment structure. A plurality of reinforced soil columns 1 may be placed above the lower cushion layer 2. Each reinforced soil column 1 may be placed vertically, that is, the axial direction of each reinforced soil column 1 may be consistent with the vertical direction, and each reinforced soil column 1 may be placed closely adjacent to each other. The upper cushion layer 3 may be placed on the upper end of the reinforced soil columns 1. After all the reinforced soil columns 1 are placed on the lower cushion layer 2, it is necessary to ensure that the upper ends of all the reinforced soil columns 1 are aligned, that is, the upper ends of all the reinforced soil columns 1 may form a horizontal plane. After the upper cushion layer 3 is placed on the upper ends of the reinforced soil columns 1, the upper cushion layer 3 may also remain horizontal to form a horizontal plane; the lower cushion layer 2 may be a horizontal plane, or a stepped surface or a surface of other shapes. That is, after all the reinforced soil columns 1 are placed on the lower cushion layer 2, it is only necessary to ensure that the upper ends of the reinforced soil columns 1 form a horizontal plane, and the lower ends may be a plane or form a non-planar structure. The present invention does not make specific limitations on this.

[0040] Optionally, both the upper cushion layer 3 and the lower cushion layer 2 may be made of dense crushed stone soil as materials. That is, the upper cushion layer 3 and the lower cushion layer 2 may be formed by laying crushed stone soil during construction operations and compacting or tamping it; however, the present invention is not limited to this. The upper cushion layer 3 and the lower cushion layer 2 may also be pressed from other materials. The present invention does not make specific limitations on this.

[0041] In this embodiment, each reinforced soil column 1 may include a top plate 11, a bottom plate 12, a mesh bag 13, and bearing soil 14. Both the top plate 11 and the bottom plate 12 may be circular rigid plates. The top plate 11 and the bottom plate 12 may be arranged facing each other along the axis of the reinforced soil column 1 and are spaced apart from each other by a certain distance. The bearing soil 14 is installed between the top plate 11 and the bottom plate 12. The mesh bag 13 wraps outside the top plate 11, the bottom plate 12, and the bearing soil 14. The bearing soil 14 in the mesh bag 13 may be compressed between the top plate 11 and the bottom plate 12 and is pressed tightly in the mesh bag 13 under the limiting action of the mesh bag 13. After the bearing soil 14 is tightly compacted, the overall shape of the reinforced soil column 1 presents a cylindrical structure; however, the present invention is not limited to this. In addition to the circular plate shape, the shapes of the top plate 11 and the bottom plate 12 may also be square plates, triangular plates, or other polygonal plates, etc.; in addition to being formed into a cylindrical shape, the outer shape of the reinforced soil column 1 may also be formed into a square column shape, other polygonal column shapes, etc. The present invention does not make specific limitations on this.

[0042] Optionally, the bearing soil 14 can be selected as soil with low compressibility, low sensitivity, and high density. To meet the mechanical property requirements of the soil column through compaction, the soil body is required to be a well-graded and non-uniform general non-cohesive soil with a coefficient of uniformity > 5 and a coefficient of curvature of 1 - 3 (special soils such as laterite, loess, soft soil, saline-alkali soil, etc. cannot be used). The soil body is required to have low compressibility and high instantaneous elastic modulus in terms of deformation properties, and high shear mechanical strength in terms of strength properties of the soil body. These mechanical characteristics are mainly achieved through the compaction of the soil column. The composition of the soil is diverse. Generally, according to the economy of engineering construction, the soil excavated near the project can meet the usage requirements through soil mechanics tests; if not, other soils can be mixed to meet the mechanical requirements; a lifting part 111 can be provided at the upper end of the top plate 11. A lifting hole 112 can be formed in the center of the lifting part 111. The lifting hole 112 can be formed as a blind hole communicating with the upper part of the top plate 11. The lifting tool can extend from the upper end of the lifting part 111 into the lifting hole 112. The inner diameter of the lifting hole 112 gradually increases from top to bottom. When the lifting tool extends into the lifting hole 112, it can be fixed in the lifting part 111. By lifting the lifting tool, the reinforced soil column 1 can be lifted upward together, thus realizing the lifting operation of the reinforced soil column 1; however, the present invention is not limited thereto. The material of the bearing soil 14 can be other easily available and economical granular materials that meet the mechanical properties in addition to the soil body; in addition to opening a lifting hole for lifting, the lifting part 111 can also be designed as other lifting structures, such as grooving on the outer wall of the lifting part 111, etc., as long as it can be matched with the lifting tool to facilitate the lifting operation. The present invention does not make specific limitations on this.

[0043] Optionally, the material of the mesh bag 13 can be divided into a reinforcing material 131 and a fabric 132. Among them, the reinforcing material 131 can be distributed in a criss-cross pattern on the surface of the fabric 132. The reinforcing material 131 can be fixedly connected to the fabric 132 by hot melt bonding. The material of the reinforcing material 131 can be a fiber-reinforced polymer material. Specifically, in order to make the reinforcing material 131 have higher strength and stiffness, a carbon fiber composite polymer material can be further selected. The material of the fabric 132 can be a polymer woven geotextile. The polymer woven geotextile can be a fabric formed by fusing a fiber material and a polymer material, and has good water permeability and air permeability characteristics. The reinforcing material 131 and the fabric 132 can be hot melt bonded to form an integral mesh bag structure. The bearing soil 14 can be filled in the mesh bag 13, and the compacted bearing soil 14 can be used to ensure that the deformation modulus, instantaneous elastic modulus, and strength of the bearing soil 14 can meet the requirements of bearing and stability. In addition, the height of the reinforced soil column 1 is determined by the height of the bearing soil 14 filled in the mesh bag 13 after being pounded and compacted, and the designed height of the reinforced soil column 1 needs to be determined by the original heights of the road surface and the ground to meet the requirements of the flatness and spatial shape of the road surface. However, the present invention is not limited thereto. The reinforcing material 131 can also be other materials that meet the strength and stiffness requirements, the fabric 132 can also be other materials that meet the water permeability and air permeability requirements, and the fixing method between the reinforcing material 131 and the fabric 132 is not limited to hot melt bonding, and can also be fixedly connected by other fixing methods. The present invention does not make specific limitations on this.

[0044] In this embodiment, the assembled embankment structure may further include a drainage system 6. The drainage system 6 may include a plurality of drain pipes 61. The upper ends of the drain pipes 61 can pass through the lower cushion 2 and be placed in the gaps between the reinforced soil columns 1. The lower ends of the drain pipes 61 are located below the assembled embankment structure. The free water in the assembled embankment structure can be discharged to the outside of the assembled embankment structure through the drain pipes 61, so as to ensure that there is no water accumulation in the assembled embankment structure and avoid the influence of too high groundwater level on the stability of the embankment structure. In addition, for saline-alkali foundations, the present invention can control the water supply and drainage, and dissolve and carry away the salts near the surface through water, so as to avoid the salt expansion problem. However, the present invention is not limited thereto. The number of the drain pipes 61 in the drainage system 6 can be any number, and the drainage system 6 can also include other devices, such as a sump, etc. The present invention does not make specific limitations on this.

[0045] In this embodiment, the prefabricated embankment structure may further include a temperature control system 7. The temperature control system 7 may include multiple temperature control pipes 71. The multiple temperature control pipes 71 may be installed in the gaps between the reinforced soil columns 1, and both ends thereof may extend out of the prefabricated embankment structure. By injecting a heating medium, such as circulating hot water or hot oil generated by solar energy, into the temperature control pipes 71, heat can be brought into the prefabricated embankment structure to adjust the ambient temperature in the prefabricated embankment structure, which can be used to avoid phenomena such as frost heaving and freeze-thaw damage in cold regions and ensure the safety of the soil column structure. However, the present invention is not limited thereto. The number of the temperature control pipes 71 in the temperature control system 7 may be any number, and the temperature control system 7 may also include other devices, such as a temperature control system, a heating device, etc. The present invention does not make specific limitations thereto.

[0046] In this embodiment, the gaps between the reinforced soil columns 1 installed in the prefabricated embankment structure may also be filled with sandy soil or gravelly soil, which can be used to improve the stability of the overall support performance of the prefabricated embankment structure. However, the present invention is not limited thereto. In addition to sandy soil or gravelly soil, the gaps between the reinforced soil columns 1 may also be filled with other media, as long as the support performance and stability of the overall structure can be improved. The present invention does not make specific limitations thereto.

[0047] In this embodiment, the prefabricated embankment structure may further include two retaining walls 4. The two retaining walls 4 are respectively arranged on both sides of the reinforced soil columns 1 in the prefabricated embankment structure to limit the reinforced soil columns 1 between the two retaining walls 4, which can be used to support the reinforced soil columns 1 in contact with the retaining walls 4 and prevent the reinforced soil columns 1 therebetween from toppling or undergoing horizontal shear displacement.

[0048] Optionally, a reinforcement structure 8 may be provided in the upper cushion layer 3. The reinforcement structure 8 is embedded in the upper cushion layer 3. The reinforcement structure 8 includes multiple transverse reinforcement bars 81 and longitudinal reinforcement bars 82 that are arranged crosswise. Multiple reinforcement fixing ends 41 are buried in each of the two retaining walls 4. Each reinforcement fixing end 41 can be welded to both ends of each transverse reinforcement bar 81, so that the transverse reinforcement bars 81 can be anchored in the two retaining walls 4, thereby forming an integral structure between the upper cushion layer 3 and the retaining walls 4, stabilizing the reinforced soil columns 1, weakening the toppling deformation and mutual displacement deformation of the reinforced soil columns 1, and enhancing the anti-toppling ability of the retaining walls 4 and the overall stability of the embankment structure. However, the present invention is not limited thereto. The number of the retaining walls 4 may also be any other number except two. For example, when the number of the retaining walls 4 is four, reinforcement fixing ends may also be buried in the two retaining walls at both ends of the longitudinal reinforcement bars 82 to anchor the longitudinal reinforcement bars 82, thereby further enhancing the connection performance between the upper cushion layer 3 and the retaining walls 4. The present invention does not make specific limitations thereto.

[0049] Optionally, a surface layer 5 can also be laid above the upper cushion layer 3. The material of the surface layer 5 is road surface material, and the material and structure are determined in combination with road design. The surface layer 5 can be used as the road surface to bear the direct load from above and transfer the pressure downward to the upper cushion layer 3, the reinforced soil column 1, and the lower cushion layer 2. This invention only focuses on the embankment part and does not specifically limit the surface layer.

[0050] In addition, as a low-cost bearing structure (compared with cement-based material structures), the reinforced soil column can be used not only in road embankments but also as a bearing structure in other scenarios. For example, in the construction of building foundations, the reinforced soil column can be used to fill (or raise) the construction site and be directly used as the foundation in whole or in part, while retaining the advantages brought by the modular and high-stability characteristics of this type of structure.

[0051] Exemplary Embodiment 2

[0052] This exemplary embodiment provides a reinforced soil column support device.

[0053] The reinforced soil column support device described in this exemplary embodiment can be applied to the prefabricated fill embankment structure described in Exemplary Embodiment 1.

[0054] As Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 shown in, the reinforced soil column support device can include a top plate 11, a bottom plate 12, a mesh bag 13, and bearing soil 14. Both the top plate 11 and the bottom plate 12 can be circular rigid plates. The top plate 11 and the bottom plate 12 are arranged facing each other along the axis of the reinforced soil column and are spaced apart from each other by a certain distance. The bearing soil 14 is installed between the top plate 11 and the bottom plate 12. The mesh bag 13 wraps outside the top plate 11, the bottom plate 12, and the bearing soil 14. The bearing soil 14 in the mesh bag 13 can be compressed by the top plate 11 and the bottom plate 12 and be pressed tightly in the mesh bag 13 under the limiting effect of the mesh bag 13. After the bearing soil 14 is tightly compacted, the overall shape of the reinforced soil column presents a cylindrical structure; however, this invention is not limited thereto. In addition to the circular plate shape, the shapes of the top plate 11 and the bottom plate 12 can also be square plates, triangular plates, or other polygonal plates, etc.; in addition to being formed into a cylindrical shape, the outer shape of the reinforced soil column can also be formed into a square column shape, other polygonal column shapes, etc., and this invention does not specifically limit this.

[0055] Optionally, the bearing soil 14 can be selected as soil with low compressibility, low sensitivity, and high density. In order to meet the mechanical property requirements of the soil column through compaction, the soil body is required to be a well-graded and non-uniform general non-cohesive soil with a coefficient of uniformity > 5 and a coefficient of curvature of 1 - 3 (special soils such as laterite, loess, soft soil, saline-alkali soil, etc. cannot be used). The soil body is required to have low compressibility and high instantaneous elastic modulus in terms of deformation properties, and high shear mechanical strength in terms of strength properties of the soil body. These mechanical characteristics are mainly achieved through the compaction of the soil column. The composition of the soil is diverse. Generally, according to the economy of engineering construction, the soil excavated near the project can be used as long as it meets the usage requirements through soil mechanics tests; if not, other soils can be incorporated for blending to meet the mechanical requirements; a lifting part 111 can be provided at the upper end of the top plate 11. A lifting hole 112 can be opened at the center of the lifting part 111. The lifting hole 112 can be formed as a blind hole communicating with the upper part of the top plate 11. The lifting tool can extend from the upper end of the lifting part 111 into the lifting hole 112. The inner diameter of the lifting hole 112 gradually increases from top to bottom. When the lifting tool extends into the lifting hole 112, it can be fixed in the lifting part 111. By lifting the lifting tool, the reinforced soil column 1 can be lifted upward together, thus realizing the lifting operation of the reinforced soil column 1; however, the present invention is not limited thereto. In addition to the soil body, the material of the bearing soil 14 can also be other easily available and economical particulate materials that meet the mechanical properties; in addition to opening the lifting hole for lifting, the lifting part 111 can also be designed as other lifting structures, such as grooving on the outer wall of the lifting part 111, etc., as long as it can be matched with the lifting tool to facilitate the lifting operation, and the present invention does not make specific limitations on this.

[0056] Optionally, the material of the mesh bag 13 can be divided into a rib material 131 and a fabric 132. Among them, the rib material 131 can be distributed in a criss-cross pattern on the surface of the fabric 132. The rib material 131 can be fixedly connected to the fabric 132 by hot melt bonding. The material of the rib material 131 can be a fiber-reinforced polymer material. Specifically, in order to make the rib material 131 have higher strength and stiffness, a carbon fiber composite polymer material can be further selected. The material of the fabric 132 can be a polymer woven geotextile. The polymer woven geotextile can be a fabric formed by fusing a fiber material and a polymer material, and has good water permeability and air permeability characteristics. The rib material 131 and the fabric 132 can be hot melt bonded to form an integral mesh bag structure. The bearing soil 14 can be filled in the mesh bag 13, and the compacted bearing soil 14 can be used to ensure that the deformation modulus, instantaneous elastic modulus, and strength of the bearing soil 14 can meet the requirements of bearing and stability. In addition, the height of the reinforced soil column 1 is determined by the height of the bearing soil 14 filled in the mesh bag 13 after being pounded and compacted, and the designed height of the reinforced soil column 1 needs to be determined by the original heights of the road surface and the ground to meet the requirements of road surface flatness and spatial shape. However, the present invention is not limited thereto. The rib material 131 can also be other materials that meet the strength and stiffness requirements, the fabric 132 can also be other materials that meet the water permeability and air permeability requirements, and the fixing method between the rib material 131 and the fabric 132 is not limited to hot melt bonding, and can also be fixedly connected by other fixing methods. The present invention does not make specific limitations in this regard.

[0057] Exemplary Embodiment 3

[0058] This exemplary embodiment provides a method for constructing an embankment filled with soil.

[0059] The method for constructing an embankment filled with soil described in this exemplary embodiment can be carried out by using the prefabricated embankment structure described in Exemplary Embodiment 1 or the reinforced soil column support device described in Exemplary Embodiment 2.

[0060] Figure 5 The schematic diagram of the processing mold of the reinforced soil column according to the exemplary embodiment of the present invention is shown; Figure 6 The schematic diagram of the processing method of the reinforced soil column according to the exemplary embodiment of the present invention is shown.

[0061] As Figures 1 to 6 shown in, the method for constructing an embankment filled with soil described in this exemplary embodiment can include a foundation laying link and a design, processing, and installation link of the reinforced soil column. Among them,

[0062] The foundation laying link includes the following specific steps:

[0063] First, conduct preliminary site treatment to ensure that the stratum rock and soil at the foundation location can meet the bearing capacity and deformation requirements needed for the design. If there are adverse geological phenomena, corresponding treatment should be carried out. According to the general road excavation or filling situation, the roadbed of the present invention can be of embankment type and excavation-fill combination type (such as Figure 4 shown in

[0064] Before construction, according to the roadbed design elevation and the engineering site elevation, and in accordance with the roadbed design, carry out operations such as site excavation and leveling. Then, carry out the construction of precast retaining wall hoisting and underground pipeline burial. Finally, lay a lower cushion layer 2 with crushed stone soil on the site inside the retaining wall 4, and compact or tamp the lower cushion layer 2.

[0065] Combined with the elevation difference data between the lower cushion layer and the road surface, calculate the height dimension of each reinforced soil column 1, and design the spatial arrangement of the reinforced soil columns 1;

[0066] The processing of the reinforced soil column 1 is carried out at the construction site. Since the reinforced soil column 1 has high quality requirements, it needs to be precisely processed by an automated machine. Therefore, an engineering vehicle with a reinforced soil column processing machine is required to move with the construction site, and at the same time, a crane is needed to carry and install the reinforced soil column 1. The reinforced soil column 1 can be processed using a rigid mold that can be opened and closed (such as Figure 5 shown in

[0067] As Figure 6 shown in

[0068] The processing method of the reinforced soil column is as follows:

[0069] S1: First, close the mold to form a cylindrical cavity; then put in the mesh bag, and seal the bottom end with a hot-melt pressing device, and unfold and fix the top end of the bag mouth on the mold.

[0070] S2: Place a bottom plate at the bottom of the mesh bag so that the bottom plate is close to the bottom of the mesh bag.

[0071] Layer by layer, add the loose soil body prepared artificially. The main mineral composition and particle gradation of the soil body are optimized so that the soil body can reach the required density after pressure compaction, and ensure that the mechanical properties of the compacted soil body meet the bearing needs. Since the density of the soil body after compaction is closely related to compaction energy, water content, etc. - Therefore, it is necessary to conduct laboratory compaction tests, soil compression tests, soil shear tests (or soil triaxial tests), etc. in advance to determine the optimal water content and the required compaction energy.

[0071] S4: When the height of the rammed soil column meets the design requirements, place the top plate so that the top plate is in close contact with the soil mass.

[0072] S5: Seal the reinforced soil column, that is, gather the mesh bags reserved at the upper part of the soil column inward, and then put on a polymer ring; then use a pressurized hot-melt device to melt the mesh bag and the polymer ring into a whole. Then cut off the excess mesh bag material, and a complete reinforced soil column is formed.

[0073] S6: Carry out the hoisting of the reinforced soil column. Since the processed reinforced soil column is heavy, mechanical assistance is required to complete the position transfer and installation. Therefore, there is a hoisting hole on the top plate; open the processing mold, clamp the reinforced soil column with a special fixture, or use a lifting tool to extend into the hoisting hole and fix it, lift the reinforced soil column and move it to the installation position of the reinforced soil column to complete the installation.

[0074] In this embodiment, the construction method of the filled embankment may further include the installation link of the drainage and temperature control system and the laying link of the upper cushion layer. Among them,

[0075] The installation link of the drainage and temperature control system includes:

[0076] During the hoisting process of the reinforced soil column, according to the design drawings, bury the drainage and temperature control system (drain pipes, temperature control pipes, etc.) into the pores between the reinforced soil columns, and promptly fill the pores with sandy soil or gravel soil. The filling soil in the pores between the reinforced soil columns does not serve as a bearing structure, so there is no need to compact or ram it.

[0077] The laying link of the upper cushion layer includes:

[0078] After the installation of the reinforced soil column, start laying the upper cushion layer, and bury the tie bars in the upper cushion layer. The tie bars can be selected from common building materials such as steel bars, or geosynthetics can be used. Connect the horizontal tie bars and / or vertical tie bars with the reserved structure of the retaining wall to form an integral structure. Thereby improving the anti-overturning ability of the retaining wall and the overall stability of the subgrade structure; after the installation of the embankment part structure is completed, the next step can be to carry out the construction of the pavement structure on the upper cushion layer according to the pavement design scheme.

[0079] The main checking calculation outline of the construction project of the prefabricated filled embankment structure described in the present invention is as follows:

[0080] As a structure in subgrade engineering, the mechanical stability checking calculation of the prefabricated filled embankment structure described in the present invention still conforms to the general engineering mechanics and geotechnical mechanics principles. Professional engineering and technical personnel in this field have the relevant checking calculation ability, so the mechanical model and analysis method of this structure will not be given in detail. The main mechanical stability checking calculations required for the structure involved in the present invention are:

[0081] (1) Check the foundation stability. That is, check the mechanical stability of the underlying geotechnical body supporting the embankment structure. According to the general checking rules of geotechnical structures, it mainly includes the checking of subgrade bearing capacity, subgrade deformation, and anti-sliding stability. For special geotechnical bodies or adverse geological phenomena, different engineering measures can be reasonably adopted, and relevant checks need to be added.

[0082] (2) Check the stability of the retaining wall - reinforced soil column structure. Under the interaction of the retaining wall and the reinforced soil column, it is necessary to conduct the checking of anti-overturning stability and anti-sliding stability of the structure under various different loads (dynamic loads, earthquakes, flash floods, debris flows, etc.).

[0083] (3) Check the stability of the reinforced soil column. When designing a single reinforced soil column, in addition to testing and designing the basic physical and mechanical parameters of the soil in the mesh bag, it is also necessary to check the soil stress and the force on the bag under the designed compaction degree to ensure the safety of the polymer mesh bag (generally, only the soil column in extreme cases needs to be checked). Since the size of the reinforced soil column may be dominant in the vertical direction, in order to ensure the consistency of the vertical deformation of the embankment at different positions, it is necessary to check the deformation amount, long-term settlement deformation amount, swelling deformation amount under saturated conditions, and thermal expansion and contraction deformation amount of each reinforced soil column under extreme loads, so as to ensure the long-term safety and stability of the embankment structure.

[0084] In summary, the assembled earth-filled embankment structure of the present invention changes the main stress-bearing structure from a "soil heap" to a "soil column": essentially optimizing the stress characteristics of the soil mass, making the soil mass at any point in the soil column tend to be in a triaxial compression state, reducing the shear failure stress, and more fundamentally eliminating the generation of tensile stress. Through refined compaction and management, the natural spatio-temporal variability and non-uniformity of the soil mass between different soil columns are reduced, avoiding the influence of non-uniform deformation of the soil column on the stability of the embankment structure. Moreover, the structural modularity brings a new model for design and construction: changing from the previous "large-scale excavation and filling" to refined assembly. Combining relevant automation and informatization technologies can not only improve the quality but also speed up the project; at the same time, the modularity of the structure brings a longer engineering structure life cycle: since the embankment of this structure is composed of reinforced soil columns, when the embankment and subgrade are damaged, only a few reinforced soil columns need to be replaced to quickly repair. And when the road cannot meet the traffic volume demand, it is also convenient to expand the road on the existing embankment foundation. In addition, the modularity of the structure brings diversification of functions in space and time: during the long-term use of the road, it will be affected by various external loads and external environments. The modular structure can greatly improve the long-term safety and stability of the road and provide a high-quality operation environment for traffic by installing different components or adding environmental control equipment; the assembled earth-filled embankment structure of the present invention can be used not only in the construction project of a new embankment structure but also in the subgrade disease repair project and the embankment project in the lateral expansion of the road. Due to the excellent mechanical properties of the reinforced soil column and the modularity of the embankment structure, it has the advantages of convenience, speed, and good effect in these projects.

[0085] Although the present invention has been described above in connection with exemplary embodiments and the accompanying drawings, those of ordinary skill in the art should clearly understand that various modifications can be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. An assembled earth-filled embankment structure, characterized in that, The embankment structure includes a number of reinforced soil columns, a lower cushion layer and an upper cushion layer. Among them, a number of reinforced soil columns are arranged side by side on the lower cushion layer. The axis of each reinforced soil column is arranged vertically. Each reinforced soil column includes a top plate, a bottom plate, a mesh bag and bearing soil. The top plate and the bottom plate are opposite and spaced along the axis. The bearing soil is arranged between the top plate and the bottom plate. The mesh bag wraps around the top plate, the bottom plate and the bearing soil. The bearing soil in the mesh bag can be tightly compacted by the top plate and the bottom plate; the upper end surfaces of a number of reinforced soil columns are aligned with each other, and the upper cushion layer is laid on the upper ends of a number of reinforced soil columns to form a horizontal or inclined surface; the embankment structure further includes a drainage system and a temperature control system. The drainage system includes a number of drain pipes. A number of drain pipes are respectively arranged in the gaps between adjacent reinforced soil columns. Their lower ends penetrate through the lower cushion layer and extend to the lower part of the lower cushion layer. The drainage system is used to drain the free water in the embankment structure; the temperature control system includes a number of temperature control pipes. A number of temperature control pipes are respectively arranged in the gaps between adjacent reinforced soil columns. The temperature control system is used to adjust the temperature in the embankment structure.

2. The prefabricated earth-filled embankment structure according to claim 1, characterized in that, A lifting part is formed at the upper end of the top plate. A lifting hole is opened on the lifting part. The inner diameter of the lifting hole gradually increases from top to bottom, so as to facilitate the clamping of the lifting tool into the lifting part to carry out the lifting operation of the reinforced soil column.

3. The prefabricated earth-filled embankment structure according to claim 1, wherein The mesh bag includes a reinforcing material and a fabric that are thermally fused to each other. The reinforcing material is made of a fiber-reinforced polymer material, and the fabric is made of a polymer woven geotextile.

4. The prefabricated soil-filled embankment structure according to claim 1, wherein, The gaps between adjacent reinforced soil columns can be filled with sandy soil or gravelly soil to improve the stability of the reinforced soil columns.

5. The prefabricated soil-filled embankment structure according to claim 1, characterized in that, The embankment structure further includes at least one retaining wall. The retaining wall is arranged on one side of a number of reinforced soil columns and is used to support the reinforced soil columns in contact with it to prevent the reinforced soil columns from toppling or undergoing horizontal shear displacement; a tensile reinforcement structure is arranged in the upper cushion layer. The tensile reinforcement structure includes a number of transverse tensile reinforcements and a number of longitudinal tensile reinforcements that are arranged crosswise. A number of tensile reinforcement fixing ends are buried in the retaining wall. The number of tensile reinforcement fixing ends are fixedly connected to the two ends of a number of transverse tensile reinforcements and / or the two ends of a number of longitudinal tensile reinforcements, and can anchor the tensile reinforcement structure in the retaining wall, which is used to stabilize the reinforced soil columns, weaken the toppling deformation of the reinforced soil columns and the mutual displacement deformation.

6. A construction method for earth-filled embankment, characterized in that, The construction method adopts the assembled fill embankment structure described in any one of claims 1 to 5, including a foundation laying link and a design, processing and installation link of the reinforced soil columns. Among them, the foundation laying link includes carrying out site excavation and leveling operations; carrying out the construction of retaining wall hoisting and underground pipeline burying; laying the lower cushion layer on the site between the retaining walls and compacting or ramming it; the design, processing and installation link of the reinforced soil columns includes calculating the size of each reinforced soil column and designing the spatial arrangement mode of the reinforced soil columns; processing the reinforced soil columns with a reinforced soil column processing mold; using a lifting tool to clamp into the lifting hole on the reinforced soil column to lift the reinforced soil column, move it to the designated installation position, and complete the installation of the reinforced soil column.

7. The construction method of the earth-filled embankment according to claim 6, characterized in that, The construction method further includes a drainage and temperature control system installation link and a laying link of the upper cushion layer. Among them, The installation process of the drainage and temperature control system includes burying the drain pipe and the temperature control pipe in the gaps between adjacent reinforced soil columns, and filling the gaps with sandy soil or gravel soil; The laying process of the upper cushion layer includes burying the reinforcing structure in the upper cushion layer, laying the upper cushion layer on the upper ends of the reinforced soil columns, and connecting the two ends of the transverse reinforcing bars and / or longitudinal reinforcing bars to the reinforcing bar fixed ends in the retaining wall to form the overall structure of the assembled earth-filled embankment structure.

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