Ribbed light soil widening embankment structure of waterside road and construction method of reinforced light soil widening embankment structure

Abstract

The invention discloses a waterside road reinforced light soil widening embankment structure and a construction method thereof, and relates to the technical field of road engineering design. In order to solve the problem that the use performance and the service life of a road are affected due to the fact that an existing widened embankment structure is prone to being excessively large in embankment settlement, the following technical scheme is provided that the structure comprises an existing embankment, a widened embankment and a step arranged on the inner side of the existing embankment, an inverted filter layer is arranged on the surface of the step, and retaining walls are arranged on the outer side and the bottom of the widened embankment; and a light soil layer is filled between the inverted filter layer and the retaining wall, a geogrid is transversely laid on the upper middle portion of the light soil layer, and the light soil layer is connected with the existing embankment through an obliquely-arranged connecting reinforcement cage. Connection of the new foundation and the old foundation is enhanced, the integrity of the new foundation and the old foundation is improved, differential settlement and joint cracking are reduced, the anti-floating capacity of the embankment can be remarkably improved, and possible displacement and scouring damage of a slope toe are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of road engineering design, and in particular to a reinforced lightweight soil widening embankment structure for a waterside highway and a construction method thereof. Background Art

[0002] At a time when my country's transportation industry is booming, the widening project of waterside highways is becoming increasingly important as a key link in improving transportation capacity and improving the layout of the transportation network. The geological conditions in the areas where waterside highways are located are usually extremely complex, with widespread soft soil, a long-term high groundwater level, and frequent water erosion. These unfavorable factors have brought many difficult problems to highway widening. However, traditional embankment widening technologies, such as layered filling method and conventional reinforced soil technology, have exposed significant limitations in the complex environment of waterside areas. When facing the soft soil foundation in the waterside area, the traditional embankment widening technology is very likely to cause uneven settlement during long-term use due to the large difference in stiffness between the new and old roadbeds. This uneven settlement will further lead to diseases such as longitudinal cracking on the road surface, seriously affecting the safety and comfort of driving. At the same time, the high groundwater level in the waterside area makes the embankment bear the buoyancy of groundwater for a long time. Traditional anti-floating measures, such as anti-floating anchors, have problems such as complex construction and large disturbance to the existing structure in actual application, and it is difficult to effectively solve the anti-floating needs of the embankment. In addition, the scouring and erosion of the slope foot by water flow also seriously threatens the stability of the embankment. Traditional protective measures are often ineffective and cannot fundamentally guarantee the long-term stability of the embankment.

[0003] In this context, developing an embankment widening structure and construction method that can effectively cope with complex water environments has become a key issue that needs to be urgently addressed in the current transportation engineering field. Summary of the invention

[0004] The purpose of the present invention is to provide a lightweight reinforced embankment as a new embankment structure, which can effectively solve the above problems. Due to its material properties, the lightweight reinforced embankment can reduce the amount of fill while ensuring the stability of the embankment. For example, lightweight materials such as EPS (polystyrene foam) or lightweight foam concrete are used as embankment fillers. Compared with traditional soil and stone materials, they are large in volume and light in weight, which can reduce the dead weight of the embankment, thereby reducing the area occupied by the embankment.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A reinforced lightweight soil widening embankment structure for a waterfront highway comprises: an existing embankment, a widening embankment and a step arranged on the inner side of the existing embankment, a filter layer is arranged on the surface of the step, retaining walls are arranged on the outer side and the bottom of the widening embankment, a lightweight soil layer is filled between the filter layer and the retaining wall, a geogrid is horizontally laid in the middle and upper part of the lightweight soil layer, and the lightweight soil layer is connected to the existing embankment through an inclined connecting steel cage; the differentiated reinforcement materials laid in stages in the lightweight soil layer include:

[0007] Bottom layer: filled with three-dimensional geocells, with a cell height of 200mm, a node tensile strength of ≥50kN / m, and a cell filled with gravel lightweight soil with a bulk density of 12kN / m3 and a compressive strength of 1.2MPa;

[0008] Middle layer: laying bidirectional high-density polyethylene geogrid TGDG300, with transverse tensile strength ≥200kN / m, longitudinal ≥150kN / m, and grid spacing 0.5m;

[0009] Top layer: Lay glass fiber grid with tensile strength of 100kN / m and elongation ≤5%, and cover the surface with geotextile to prevent the loss of lightweight soil particles.

[0010] Preferably, a prestressed anchor rod is provided on one side of the retaining wall, and the existing embankment and the widened embankment are anchored and tied together by the prestressed anchor rod.

[0011] Preferably, a homogeneous grouting body is poured along the outer edge of the connecting steel cage.

[0012] Preferably, a plurality of slope drainage ditches are provided at the top of the retaining wall near the outer edge of the light soil layer.

[0013] Preferably, the surface of the retaining wall is provided with a waterproof layer and a planting soil layer for slope protection.

[0014] Preferably, a reinforced concrete connecting plate is provided at the bottom of the retaining wall, and anti-floating anchor rods and positioning steel bars are fixed at the bottom of the reinforced concrete connecting plate.

[0015] Preferably, the existing embankment includes an original concrete structure layer, an original structural foundation and an original foundation cushion layer arranged in sequence from top to bottom.

[0016] The present invention also includes a construction method for a reinforced lightweight soil widening embankment structure of a waterside highway, comprising the following steps:

[0017] S1. Prepare the construction site and equipment: clean the existing embankment slope, prepare necessary construction machinery and equipment, set up cofferdam structure to isolate the construction area, treat the soft soil foundation to enhance the bearing capacity of the foundation, and then implement artificial precipitation measures to lower the groundwater level;

[0018] S2. Installation and positioning of anti - floating anchor rods: Set anti - floating anchor rods at the designated positions at the bottom of the existing embankment, measure and determine the hole - opening size of the anti - floating anchor rods, use a drilling rig for hole - forming operations and clean the soil in the hole, inject concrete slurry into the hole until it is filled, and accurately fix the position of the anti - floating anchor rods using positioning steel bars;

[0019] S3. Pouring the reinforced concrete connecting plate and retaining wall: After leveling the construction site, pour reinforced concrete to form the reinforced concrete connecting plate and the outer retaining wall structure, and at the same time reserve the installation hole positions for prestressed anchor rods on the retaining wall;

[0020] S4. Foundation treatment of the original structure and step excavation: Drill holes on the foundation of the original structure according to the design requirements, and perform reaming treatment on the bottom. Excavate multiple - level steps on one side of the foundation of the original structure, and lay filter layers on each step to enhance the drainage performance;

[0021] S5. Construction of prestressed anchor rods and steel reinforcement cages: Continue to drill holes and set enlarged holes on the foundation of the original structure, inject slurry into the enlarged holes to form a grouting body, insert the prestressed anchor rods into the installation holes reserved on the outer retaining wall, perform prestress tensioning and fixation after filling the lightweight soil layer, and at the same time implant one side of the connecting steel reinforcement cage into the foundation of the original structure, use concrete grouting to seal the pores, and reserve the other side of the connecting steel reinforcement cage for connection with the lightweight soil layer;

[0022] S6. Pouring the lightweight soil layer and laying geogrids: Pour lightweight fillers on the top surface of the reinforced concrete connecting plate to form a lightweight soil layer. When the lightweight fillers are filled to the elevation of each step surface of the existing embankment slope, lay transverse geogrids on the lightweight soil layer to enhance the overall stability; The differential reinforcement materials are laid in stages in the lightweight soil layer, including the following steps:

[0023] S61. Laying the bottom - layer three - dimensional geocell:

[0024] The bottom - layer reinforcement area is 0.5 - 1 m. Use three - dimensional geocells to fill the reinforced concrete connecting plate with crushed - stone lightweight soil. After leveling, lay the three - dimensional geocells, fix them to the lower - layer crushed - stone lightweight soil with U - shaped nails, connect adjacent three - dimensional geocell sheets with special fasteners, and the longitudinal lap joint is ≥ 30 cm;

[0025] Re - fill the three - dimensional geocells with crushed - stone lightweight soil, and compact them with a plate vibrator. The compaction degree is ≥ 93%.

[0026] S62. Laying the middle - layer bidirectional geogrid:

[0027] Lay the bidirectional geogrid TGDG300. The main direction of the transverse geogrid is parallel to the embankment axis. The lap length is longitudinal ≥ 50 cm and transverse ≥ 30 cm, and it is fixed with high - strength plastic ties;

[0028] S63. Construction of the top - layer flexible geogrid and variable - stiffness transition zone:

[0029] When filling to the top reinforced area 0.5 m away from the design elevation, in the transition area with variable stiffness, 1 - 1.5 m is taken and polypropylene fibers are incorporated in gradients. A glass fiber grille is laid on the top layer, a geotextile is covered above the glass fiber grille, and the planting soil layer is backfilled, and a light roller is used for static compaction 1 - 2 times;

[0030] S7. Slope trimming and pavement structure pouring: After the lightweight soil layer is poured, the slope above the outer retaining wall is trimmed to form multiple stepped slopes, and the top pavement structure layer is poured using a reinforced concrete structure to ensure that its elevation is flush with the top of the existing embankment.

[0031] Preferably, when pouring the lightweight soil layer in step S6, a method of layered pouring and vibrating compactly is adopted to ensure the uniformity and compactness of the lightweight concrete layer. At the same time, the surface of the lightweight soil layer is leveled before laying the geogrid to ensure the tight combination of the geogrid and the lightweight soil layer.

[0032] Preferably, step S7 also includes the laying of a waterproof layer and the setting of a drainage system: A waterproof layer is laid on the outside of the widened embankment slope to isolate moisture, a planting soil layer is set outside the waterproof layer for ecological restoration, and at the same time, multiple drainage ditches are set on the bottom platform of each stepped slope to effectively drain accumulated water.

[0033] The present invention has the following beneficial effects:

[0034] The widened embankment structure of the present invention adopts a geogrid - reinforced lightweight soil structure, which will significantly reduce the self - weight of the embankment, effectively reduce the differential settlement of the embankment and pavement cracking, and improve the service life of the subgrade and pavement. A tension - anchor device is set at the connection of the new and original embankments to enhance the connection strength of the new and original embankments and prevent cracking at the connection of the new and original embankments.

[0035] Anti - floating anchor rods are set at the bottom of the foundation, significantly improving the anti - floating force of the embankment and solving the problem of foundation floating caused by rising water levels. Multiple stepped slopes are set on the outside of the embankment to reduce the single - step height, which is beneficial to the stable laying of the planting soil layer or planting bags. A concrete retaining wall is set at the bottom to prevent the damage of water flow to the slope toe. Brief Description of the Drawings

[0036] Figure 1 is a schematic structural diagram of the lightweight - reinforced embankment of the present invention as a new embankment structure;

[0037] Figure 2 is Figure 1 a partial enlarged view of A in

[0038] Figure 3 is Figure 1 a partial enlarged view of B in

[0039] Figure 4For Figure 1 Partial enlarged view at position C in

[0040] Figures 1 to 4 The reference numerals shown in Detailed implementation manners

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0042] Please refer to Figures 1-4 , the present invention provides a water-side highway reinforced lightweight soil widened embankment structure and its construction method. This structure can effectively enhance the stability and bearing capacity of the embankment. At the same time, the construction method has clear steps and is easy to operate, and is applicable to the embankment widening project in complex environments such as water-side highways. The following is a detailed description of the specific implementation manners of the present invention.

[0043] First, the water-side highway reinforced lightweight soil widened embankment structure of the present invention mainly includes an existing embankment 1, a widened embankment 2, and a step 3 arranged inside the existing embankment 1. The existing embankment 1 is the original subgrade structure, which is structurally stable and has a certain bearing capacity. In order to widen the embankment, the present invention arranges a widened embankment 2 on one side of the existing embankment 1. In order to enhance the connection stability between the widened embankment 2 and the existing embankment 1, the present invention excavates multiple steps 3 inside the existing embankment 1. The setting of the steps 3 not only increases the contact area between the widened embankment 2 and the existing embankment 1, but also reduces stress concentration through a gradual transition method, improving the overall stability of the structure.

[0044] On the surface of the step 3, the present invention arranges an anti-filter layer 5. The anti-filter layer 5 is mainly composed of granular materials such as gravel and sand and has good water permeability. By arranging the anti-filter layer 5, it can effectively prevent water penetration from damaging the embankment structure, and at the same time enhance the drainage performance and keep the embankment structure dry and stable.

[0045] Retaining walls 6 are provided on both the outer side and the bottom of the widened embankment 2. As the supporting structure of the widened embankment 2, the retaining walls 6 can effectively prevent the collapse and sliding of the embankment slope and improve the overall stability of the embankment. High-strength materials such as reinforced concrete can be selected as the materials for the retaining walls 6 to ensure their bearing capacity and durability.

[0046] Between the filter layer 5 and the retaining wall 6, a lightweight soil layer 21 is filled in the present invention. The lightweight soil layer 21 is mainly composed of lightweight materials, such as foamed concrete, lightweight aggregate concrete, etc. The setting of the lightweight soil layer 21 can not only reduce the self-weight of the embankment structure, but also improve the seismic performance and bearing capacity of the embankment. At the same time, the lightweight soil layer 21 also has good heat insulation and sound insulation properties, which helps to improve the driving environment of the road.

[0047] In order to further enhance the stability and bearing capacity of the lightweight soil layer 21, geogrid 22 is transversely laid in the upper and middle parts of the lightweight soil layer 21 in the present invention. The geogrid 22 is a kind of geosynthetic material with high strength and high modulus, and has good tensile performance and shear resistance. By setting the geogrid 22, the deformation of the lightweight soil layer 21 can be effectively restricted, and its overall stability and bearing capacity can be improved.

[0048] In addition, the lightweight soil layer 21 is also connected to the existing embankment 1 through the inclined connecting steel reinforcement cage 4. The connecting steel reinforcement cage 4 is woven by multiple steel bars and has good tensile and shear properties. By implanting one end of the connecting steel reinforcement cage 4 into the existing embankment 1 and connecting the other end to the lightweight soil layer 21, the load and stress can be effectively transmitted, and the connection stability between the widened embankment 2 and the existing embankment 1 can be enhanced.

[0049] One side of the retaining wall 6 is provided with a prestressed anchor rod 7. The prestressed anchor rod 7 is a high-strength and high-prestress anchoring member. By setting the prestressed anchor rod 7, the load of the widened embankment 2 can be effectively transmitted to the deep stable stratum, and the overall stability and bearing capacity of the embankment can be improved. At the same time, the prestressed anchor rod 7 can also reinforce the retaining wall 6 to prevent it from overturning or sliding. The existing embankment 1 and the widened embankment 2 are anchored and tied by the prestressed anchor rod 7, further enhancing the connection stability between the two.

[0050] A homogeneous grouting body 8 is cast on the outer edge of the connecting steel reinforcement cage 4. The homogeneous grouting body 8 is mainly composed of materials such as cement, sand, and stone, and has good strength and durability. By setting the homogeneous grouting body 8, the gap between the connecting steel reinforcement cage 4 and the surrounding soil can be effectively filled, and the bonding force and friction force between the connecting steel reinforcement cage 4 and the soil can be improved, thereby enhancing its anchoring effect.

[0051] In order to further improve the drainage performance of the embankment structure, in this embodiment, multiple sloping drainage ditches 23 are provided at the top of the retaining wall 6 near the outer edge of the lightweight soil layer 21. The setting of the sloping drainage ditches 23 can effectively collect and drain the accumulated water on the embankment slope, preventing the water from damaging the embankment structure. At the same time, the sloping drainage ditches 23 can also play a role in slowing down the water flow speed and preventing soil erosion.

[0052] In order to enhance the protection effect of the embankment slope, in this embodiment, a water isolation layer 24 and a planting soil layer 25 are also provided on the surface of the retaining wall 6. The water isolation layer 24 is mainly composed of waterproof materials, such as polyethylene film, waterproof coating, etc. By setting the water isolation layer 24, the erosion of the embankment slope by water can be effectively isolated, protecting the stability of the slope soil body. The planting soil layer 25 is located outside the water isolation layer 24 and is mainly composed of soil and vegetation. By setting the planting soil layer 25, ecological restoration and greening beautification can be carried out, improving the environmental protection performance and landscape effect of the embankment structure.

[0053] At the bottom of the retaining wall 6, in this embodiment, a reinforced concrete connecting plate 61 is also provided. The reinforced concrete connecting plate 61, as a connecting member between the widened embankment 2 and the existing embankment 1, can effectively transfer loads and stresses, enhancing the connection stability between the two. At the same time, the reinforced concrete connecting plate 61 also has a certain stiffness and strength, which can resist the action of external loads and deformations. At the bottom of the reinforced concrete connecting plate 61, in this embodiment, anti-floating anchor rods 62 and positioning steel bars 63 are also fixed. The setting of the anti-floating anchor rods 62 can effectively prevent the widened embankment 2 from floating and becoming unstable under the action of the groundwater buoyancy. The positioning steel bars 63 are used to accurately fix the positions of the anti-floating anchor rods 62 to ensure that they exert the expected anchoring effect.

[0054] The structure of the existing embankment 1 from top to bottom sequentially includes an original concrete structure layer 11, an original structural foundation 12, and an original foundation cushion 13. The original concrete structure layer 11, as the surface structure of the existing embankment 1, is mainly composed of materials such as concrete and has good bearing capacity and durability. The original structural foundation 12 is located below the original concrete structure layer 11 and is mainly composed of materials such as soil and rock, which is the main bearing layer of the existing embankment 1. The original foundation cushion 13 is located below the original structural foundation 12 and is mainly composed of materials such as sand and stone, which is used to improve the bearing capacity and stability of the foundation.

[0055] The following is a detailed description of the construction method of the water-side highway reinforced lightweight soil widened embankment structure provided by the present invention:

[0056] Before construction, it is first necessary to prepare the construction site. Specifically, it includes cleaning the slope of the existing embankment 1, removing surface debris and vegetation; preparing necessary construction machinery and equipment such as excavators, loaders, mixers, rollers, etc.; setting up a cofferdam structure to isolate the construction area and prevent the water flow and soil during construction from affecting the surrounding environment; treating the soft soil foundation to enhance the foundation bearing capacity, such as using methods like replacement method, drainage consolidation method, etc.; subsequently implementing artificial precipitation measures to lower the groundwater level and ensure dryness and safety during construction.

[0057] Next, carry out the setting and positioning work of the anti-floating anchor rods 62. At the set position at the bottom of the existing embankment 1, measure and determine the hole-drilling size of the anti-floating anchor rods 62 according to the design requirements. Use a drilling rig to carry out hole-forming operations. During the drilling process, continuously clean the soil slag in the hole to ensure the smoothness and straightness of the hole wall. Inject concrete slurry into the hole until it is filled, and use the setting effect of the concrete to fix the anti-floating anchor rods 62 in the hole. Finally, accurately fix the position of the anti-floating anchor rods 62 using positioning steel bars 63 to ensure that they do not shift or tilt.

[0058] Then, carry out the pouring work of the reinforced concrete connecting plate 61 and the retaining wall 6. After leveling the construction site, lay the steel mesh according to the design requirements and pour concrete to form the reinforced concrete connecting plate 61 and the outer retaining wall 6 structure. During the pouring process, pay attention to the vibration and density control of the concrete to ensure the strength and durability of the structure. At the same time, reserve the installation hole positions for the prestressed anchor rods 7 on the retaining wall 6 to prepare for subsequent construction.

[0059] Next, carry out the treatment of the original structure foundation 12 and the excavation of the steps 3. Open holes on the original structure foundation 12 according to the design requirements and carry out reaming treatment on the bottom. Excavate one side of the original structure foundation 12 to form multi-level steps 3. The width and height of the steps 3 need to be accurately controlled according to the design requirements. Lay a filter layer 5 on each step 3 to enhance the drainage performance. The material and laying thickness of the filter layer 5 also need to be selected and controlled according to the design requirements.

[0060] Then, carry out the construction work of the prestressed anchor rods 7 and the reinforcement cage 4. Continue to open holes and set enlarged holes on the original structure foundation 12, and inject slurry into the enlarged holes to form a grouting body 8. During the grouting process, pay attention to the control of the grouting pressure and grouting volume to ensure the uniformity and density of the grouting body. Pass the prestressed anchor rods 7 through the reserved installation holes on the outer retaining wall 6, and carry out prestress tensioning and fixation after the lightweight soil layer 21 is filled. At the same time, implant one side of the connecting reinforcement cage 4 into the original structure foundation 12, and use concrete grouting to seal the pores to ensure the tight combination of the connecting reinforcement cage 4 and the surrounding soil. The other side of the connecting reinforcement cage 4 reserves the position for connecting with the lightweight soil layer 21.

[0061] Next, carry out the pouring of the lightweight soil layer 21 and the laying of the geogrid 22. Lay lightweight fillers, such as foam concrete, lightweight aggregate concrete, etc., on the top surface of the reinforced concrete connection plate 61. Adopt the method of layered pouring and vibrating compactly to ensure the uniformity and compactness of the three-dimensional geocell. The three-dimensional geocell (shear strength ≥ 50 kN / m) is filled with crushed stones or high-strength lightweight soil to enhance the shear resistance. When the lightweight filler is filled to the elevation of each step 3 surface of the slope of the existing embankment 1, stop pouring and carry out leveling treatment. Lay the transverse geogrid 22 on the lightweight soil layer 21 to enhance the overall stability. The laying of the geogrid 22 needs to be flat, tight and closely combined with the lightweight soil layer 21.

[0062] Finally, carry out the slope trimming and the pouring of the road surface structure. After the pouring of the lightweight soil layer 21 is completed, trim the slope above the outer retaining wall 6 to form multiple stepped slopes. The slope and shape of the stepped slopes need to be controlled according to the design requirements. Pour the top road surface structure layer 26 with a reinforced concrete structure to ensure that its elevation is flush with the top of the existing embankment 1. During the pouring process, attention needs to be paid to the vibration and compactness control of the concrete and the treatment of the surface flatness. In addition, the laying of the waterproof layer 24 and the setting of the drainage system also need to be carried out: lay the waterproof layer 24 on the outer side of the slope of the widened embankment 2 to isolate moisture and prevent soil erosion; set the planting soil layer 25 outside the waterproof layer 24 for ecological restoration and greening beautification; at the same time, set multiple drain ditches 23 at the bottom platform of each stepped slope to effectively drain the accumulated water and protect the stability of the slope soil body. The setting of the drain ditches 23 needs to be reasonably arranged and designed according to the terrain and rainfall to ensure its drainage effect.

[0063] In summary, the structure of the water-adjacent highway reinforced lightweight soil widened embankment and its construction method of the present invention have the advantages of stable structure, high bearing capacity, simple construction, etc., and are applicable to the embankment widening projects in complex environments such as water-adjacent highways. Through reasonable structure design and the selection of construction methods, the stability and bearing capacity of the embankment can be effectively improved, and the surrounding environment can be protected at the same time.

[0064] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A reinforced lightweight soil widening embankment structure for a waterside highway, characterized in that: Including: An existing embankment (1), a widened embankment (2), and a step (3) provided inside the existing embankment (1). An anti-filter layer (5) is provided on the surface of the step (3). Retaining walls (6) are provided on the outer side and bottom of the widened embankment (2). A lightweight soil layer (21) is filled between the anti-filter layer (5) and the retaining wall (6). A geogrid (22) is horizontally laid in the upper and middle parts of the lightweight soil layer (21). The lightweight soil layer (21) is connected to the existing embankment (1) through an inclined connecting steel reinforcement cage (4); The differentiated reinforcement materials laid in stages in the lightweight soil layer (21) include: Bottom layer: Fill three-dimensional geocells (211) with a cell height of 200 mm, a node tensile strength of ≥50 kN / m, a bulk density of 12 kN / m3 for the crushed stone lightweight soil filled in the cells, and a compressive strength of 1.2 MPa; Middle layer: Lay a biaxial high-density polyethylene geogrid TGDG300 with a transverse tensile strength of ≥200 kN / m and a longitudinal strength of ≥150 kN / m, and a grid spacing of 0.5 m; Top layer: Lay a fiberglass grid (212) with a tensile strength of 100 kN / m and an elongation rate of ≤5%. The surface is covered with geotextile to prevent the loss of lightweight soil particles.

2. The reinforced lightweight soil widening embankment structure for a waterside highway according to claim 1 is characterized in that: One side of the retaining wall (6) is provided with a prestressed anchor rod (7). The existing embankment (1) and the widened embankment (2) are anchored and tied together through the prestressed anchor rod (7).

3. The reinforced lightweight soil widening embankment structure for a waterside highway according to claim 1 is characterized in that: A homogeneous grouting body (8) is poured on the outer edge of the connecting steel reinforcement cage (4).

4. The reinforced lightweight soil widened embankment structure for the waterfront highway according to claim 1, wherein Multiple sections of slope drainage ditches (23) are provided at the top of the retaining wall (6) near the outer edge of the lightweight soil layer (21).

5. The structure of the water-adjacent highway reinforced lightweight soil widened embankment according to any one of claims 4, characterized in that, The surface of the retaining wall (6) is provided with a waterproof layer (24) and a planting soil layer (25) for slope protection.

6. The structure of the reinforced lightweight soil widened embankment for the water-adjacent highway according to claim 5, wherein, The bottom of the retaining wall (6) is provided with a reinforced concrete connecting plate (61). Anti-floating anchor rods (62) and positioning steel bars (63) are fixed at the bottom of the reinforced concrete connecting plate (61).

7. The reinforced lightweight soil widening embankment structure for a waterside highway according to claim 1 is characterized in that: The existing embankment (1) includes a primary concrete structure layer (11), a primary structure foundation (12), and a primary foundation cushion layer (13) arranged in sequence from top to bottom.

8. A construction method for a reinforced lightweight soil widened embankment structure of a waterfront highway according to any one of claims 1 to 7, characterized in that, Including the following steps: S1. Prepare the construction site and equipment: Clean the slope of the existing embankment (1), prepare necessary construction machinery and equipment, set up a cofferdam structure to isolate the construction area, and treat the soft soil foundation to enhance the foundation bearing capacity. Subsequently, implement artificial dewatering measures to lower the groundwater level; S2. Set and position the anti-floating anchor rods (62): Set the anti-floating anchor rods (62) at the set positions at the bottom of the existing embankment (1), measure and determine the hole size for the anti-floating anchor rods (62), use a drill rig for hole forming operations and clean the soil in the holes, inject concrete slurry into the holes until they are filled, and accurately fix the positions of the anti-floating anchor rods (62) using the positioning steel bars (63); S3. Pour the reinforced concrete connecting plate (61) and the retaining wall (6): After leveling the construction site, pour reinforced concrete to form the structure of the reinforced concrete connecting plate (61) and the outer retaining wall (6), and at the same time, reserve the installation hole positions for the prestressed anchor rods (7) on the retaining wall (6); S4. Treatment of the original structure foundation (12) and excavation of the steps (3): According to the design requirements, holes are drilled in the original structure foundation (12), and the bottom is reamed. Multiple steps (3) are excavated on one side of the original structure foundation (12), and an anti-filter layer (5) is laid on each step (3) to enhance the drainage performance. S5. Construction of the prestressed anchor rods (7) and the steel reinforcement cages (4): Continue to drill holes and set enlarged holes in the original structure foundation (12), grout into the enlarged holes to form a grouted body (8), insert the prestressed anchor rods (12) into the installation holes reserved in the outer retaining wall (6), and perform prestress tensioning and fixation after the lightweight soil layer (12) is filled. At the same time, implant one side of the connecting steel reinforcement cage (4) into the original structure foundation (12), use concrete grouting to seal the pores, and reserve the other side of the connecting steel reinforcement cage (4) for connection with the lightweight soil layer (21). S6. Pouring of the lightweight soil layer (21) and laying of the geogrid (22): Pour lightweight fillers on the top surface of the reinforced concrete connection plate (61) to form a lightweight soil layer (21). When the lightweight fillers are filled to the elevation of each step (3) surface of the existing embankment (1) slope, lay a transverse geogrid (22) on the lightweight soil layer (21) to enhance the overall stability. Differentiated reinforcing materials are laid in stages in the lightweight soil layer (21), including the following steps: S61. Laying of the bottom three-dimensional geocell: The bottom reinforced area is 0.5 - 1 m. Use a three-dimensional geocell to fill crushed stone lightweight soil on the reinforced concrete connection plate (61). After leveling, lay the three-dimensional geocell (211), fix it to the lower layer of crushed stone lightweight soil with U-shaped nails, and connect the sheets of adjacent three-dimensional geocells (211) with special fasteners. The longitudinal lap is ≥ 30 cm. Secondary filling of crushed stone lightweight soil is carried out in the three-dimensional geocell (211), and it is compacted with a flat vibrator. The compactness is ≥ 93%. S62. Laying of the middle-layer biaxial geogrid: Lay the biaxial geogrid TGDG300. The main direction of the transverse geogrid is parallel to the embankment axis. The lap length is ≥ 50 cm longitudinally and ≥ 30 cm transversely, and it is fixed by tying with high-strength plastic straps. S63. Construction of the top flexible geogrid and the variable stiffness transition zone: When filling to the top reinforced area 0.5 m away from the design elevation, add 1 - 1.5 m of polypropylene fiber in gradient in the variable stiffness transition zone. Lay a fiberglass geogrid (212) on the top layer, cover a geotextile above the fiberglass geogrid (212), and backfill the planting soil layer (25), and compact it with a light roller statically for 1 - 2 times. S7. Slope trimming and pavement structure pouring: After the lightweight soil layer (21) is poured, trim the slope above the outer retaining wall (6) to form multiple stepped slopes, and pour the top pavement structure layer (26) with a reinforced concrete structure to ensure that its elevation is flush with the top of the existing embankment (1).

9. The construction method of the water-adjacent highway reinforced lightweight soil widened embankment structure according to claim 8, characterized in that, When pouring the lightweight soil layer (21) in step S6, adopt the method of pouring in layers and vibrating densely to ensure the uniformity and compactness of the lightweight concrete layer. At the same time, level the surface of the lightweight soil layer (21) before laying the geogrid (22) to ensure the tight combination of the geogrid (22) and the lightweight soil layer (21).

10. The construction method of the reinforced lightweight soil widened embankment structure for the water-adjacent highway according to claim 8, characterized in that, Step S7 also includes the laying of the water isolation layer (24) and the setting of the drainage system: a water isolation layer (24) is laid outside the slope of the widened embankment (2) to isolate moisture, a planting soil layer (25) is arranged outside the water isolation layer (24) for ecological restoration, and at the same time, multiple drainage ditches (23) are arranged at the bottom platform of each slope to effectively drain accumulated water.

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