Reinforced railway high-filling embankment structure
By layering and laying composite geogrid mesh in the high embankment of the railway, the problems of insufficient stability and bearing capacity of the subgrade were solved, the stability and settlement control of the embankment were achieved, and the construction quality and operational safety were improved.
Patent Information
- Application Number
- CN202422937306.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2034-11-29
AI Technical Summary
Existing railway high-fill subgrades are prone to soil loosening under long-term vibration conditions, resulting in uneven stress and strain, which can easily lead to diseases such as heave, subsidence, cracking, slippage and instability, and insufficient stability and bearing capacity.
The embankment structure is constructed in layers from bottom to top. Multiple layers of composite geogrid mesh are laid at intervals on both sides and in the middle of the embankment slope. The composite geogrid includes a mesh-like hexagonal structure and is anchored to the inner side of the embankment. The composite geogrid is used to constrain the lateral deformation of the embankment soil and improve the uniformity of stress and strain.
It improved the overall stability and ultimate bearing capacity of the embankment, reduced settlement, ensured the construction quality and operational safety of high-fill embankments, and reduced maintenance costs.
Smart Images
Figure CN223813658U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to high fill embankment technical field, specifically relates to a reinforced railway high fill embankment structure. BACKGROUND
[0002] In the process of railway construction in mountainous areas, due to the large undulating topography and complex geological structure, the embankment filling is relatively high. The main characteristics of high fill embankment include large filling engineering quantity, long construction period, large self weight, large pressure on embankment and slope, easy to cause foundation deformation, prone to problems such as collapse, settlement and instability, and it is difficult to control; the embankment filling is relatively high, and the embankment is required to have good slope stability and sufficient overall compressive resistance; the embankment itself has large cumulative settlement, and the embankment filling height must be strictly controlled, and the post-construction settlement is required to be more stringent.
[0003] At present, in the aspect of railway high fill embankment reinforcement, multiple compaction or dynamic compaction is mainly used to achieve the purpose of embankment reinforcement. However, this method of relying on compaction to increase the density of embankment soil layer is prone to soil layer relaxation under the condition of long-term vibration of railway in later period, so that the stress and strain are unevenly distributed in the embankment soil body, thereby causing diseases such as embankment uplift, subsidence, cracking, sliding and instability.
[0004] Therefore, there is an urgent need for a railway high fill embankment structure with high stability, high bearing capacity and less settlement. SUMMARY
[0005] The utility model aims at providing a reinforced railway high fill embankment structure to at least solve the problems of low stability and bearing capacity of the reinforced railway high fill embankment and easy settlement.
[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0007] A reinforced railway high fill embankment structure, which comprises an embankment lower part, an embankment middle part and an embankment upper part filled in layers from bottom to top, and a plurality of composite geogrid meshes are spaced and laid on both sides of the embankment slope from the embankment lower part to the embankment upper part, the embankment middle part is spaced and laid with a plurality of composite geogrid meshes from bottom to top, and the composite geogrid mesh is anchored to the inner side of the embankment.
[0008] The composite geogrid mesh comprises a plurality of composite geogrids, and the composite geogrid has a mesh structure.
[0009] Further, the embankment shoulder of the section with a filling height greater than 15m in the embankment slope range is reserved with a settlement widening section.
[0010] Further, the composite geogrid is hexagonal.
[0011] Further, the composite geogrid comprises a plurality of small hexagonal structures and a plurality of triangular structures, the plurality of small hexagonal structures are distributed in multiple rows, and the plurality of small hexagonal structures are hexagonal as a whole, and the plurality of triangular structures are distributed in gaps between adjacent small hexagonal structures.
[0012] Further, the small hexagonal structure comprises a central hexagonal structure and a plurality of trapezoidal structures, the central hexagonal structure is arranged at the center of the small hexagonal structure, and the plurality of trapezoidal structures are arranged around the central hexagonal structure.
[0013] Further, the central hexagonal structure and the trapezoidal structure are both hollow structures formed by a plurality of ribs.
[0014] Further, the rib comprises three layers.
[0015] Further, the three layers are respectively a tensile layer in the middle and polymer layers of nanometer energy-absorbing material on both sides of the tensile layer.
[0016] Further, the cross-sectional shape of the rib is rectangular.
[0017] Further, joints of adjacent composite geogrids in the composite geogrid mesh are overlapped with each other.
[0018] Compared with the prior art, the utility model has the advantages that:
[0019] The utility model discloses a mesh-shaped hexagonal composite geogrid, which is capable of restraining lateral deformation of embankment soil, improving overall stability and ultimate bearing capacity of the embankment, and making stress and strain more evenly distributed in embankment soil by laying multiple layers of composite geogrid meshes on both sides of the embankment slope and in the middle of the embankment, so that the embankment is less likely to settle. ACCURACY
[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings of embodiments can also be obtained according to these drawings without creative labor.
[0021] Figure 1 It is the sectional view of the utility model.
[0022] Figure 2 is Figure 1 is an enlarged schematic view of A in FIG.
[0023] Figure 3 is a schematic view of a composite geogrid structure;
[0024] Figure 4 is a schematic view of a rib section of the composite geogrid;
[0025] identified as:
[0026] 1 - lower part of embankment, 2 - middle part of embankment, 3 - upper part of embankment, 4 - composite geogrid, 5 - joint, 6 - rib. DETAILED DESCRIPTION
[0027] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.
[0028] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0029] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "setting" should be understood broadly, for example, it can be fixedly connected, set, or it can be detachably connected, set, or integrally connected, set. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0030] The utility model provides a kind of reinforced railway high embankment structure, including the embankment lower part 1 of layer filling from bottom to top, embankment middle part 2 and embankment upper part 3, multiple layers of composite geogrid mesh sheet are laid with interval from bottom to top on the both sides of embankment slope respectively, multiple layers of composite geogrid mesh sheet are laid with interval through from bottom to top in embankment middle part 2, composite geogrid mesh sheet is anchored in the inside of embankment, and composite geogrid mesh sheet includes several composite geogrids 4, and composite geogrid 4 is in mesh hole hexagonal structure, and geogrid is used as a kind of reinforced material, can constrain the lateral deformation of embankment soil body, improve the overall stability and ultimate bearing capacity of embankment, and make stress and strain more evenly distributed in embankment soil body by laying multiple layers of geogrid.
[0031] The shoulder of the section where the filling height in the embankment slope range is greater than 15m is reserved with a subsidence widening section, since the natural subsidence of high filling or train load can cause subsidence, so that the longitudinal section changes, therefore, while treating diseases, the shoulder should be widened according to needs.
[0032] Composite geogrid 4 includes several small hexagonal structures and several triangular structures, several small hexagonal structures are distributed in multiple rows, and the overall small hexagonal structure is hexagonal, and several triangular structures are distributed in the gap between adjacent small hexagonal structures.
[0033] Small hexagonal structure includes central hexagonal structure and several trapezoidal structures, central hexagonal structure is arranged at the center of small hexagonal structure, and several trapezoidal structures are arranged around the central hexagonal structure in turn.
[0034] Central hexagonal structure and trapezoidal structure are both hollow by rib 6.
[0035] Rib 6 contains three layers, and the three layers are tension layer in the middle and high molecular nanometer energy-absorbing material polymer layer on both sides of tension layer, which is formed by punching, directional stretching of three-layer co-extrusion composite polymer plate.
[0036] The cross-sectional shape of rib 6 is rectangular.
[0037] The joints 5 of adjacent composite geogrids 4 in composite geogrid mesh sheet are overlapped with each other, and the overlapping width is not less than 30cm.
[0038] Embodiment:
[0039] As Figure 1The utility model provides a reinforced railway high fill embankment structure, can make high fill embankment realize stable performance, including from bottom to top layer filling embankment lower part 1, embankment middle part 2 and embankment upper part 3, and every filling 0.9m high from ground surface to embankment slope with filling height greater than 6m, one layer of composite geogrid mesh is laid in the range of 4m wide embankment slope level, and is anchored with anchor nail in the inner side of embankment, and is laid until the bottom structure of upper part of bed.
[0040] Further, for the section with embankment filling height greater than 25m and peak acceleration of ground motion greater than or equal to 0.2g, and the embankment filling height greater than 12m, one layer of composite geogrid mesh is laid every 2m in the slope below the bottom layer of embankment bed.
[0041] The anchor nail is galvanized steel bar, which can prevent water and corrosion and has high strength, and the length of anchor nail used for fixing in embankment laying section is 10cm or 15cm, and the length of anchor nail used for anchoring on both sides of slope is 20cm or 25cm.
[0042] The embankment lower part 1 is a filler layer or an improved soil layer, the embankment middle part 2 is a filler layer, and the embankment upper part 3 is a filler layer.
[0043] The shoulder of the section with filling height greater than 15m in the range of embankment slope is reserved with a settlement widening section, which is lower than the traditional pre-settlement soil filling height, and the settlement widening section can be reduced by the reinforced embankment structure of the embodiment, and the widening range of the embodiment is 0.5-1m, specifically, 15m≤H<20m is widened by 0.5m, 20m≤H<25m is widened by 0.6m, 25m≤H<30m is widened by 0.7m, 30m≤H<35m is widened by 0.8m, and 35m≤H is widened by 1m, where H is the filling height in the range of embankment slope.
[0044] In order to prevent the composite geogrid 4 from being dug out during the construction of the embankment slope platform cut-off trench, the vertical distance between the first layer of composite geogrid mesh and the embankment slope platform is not less than 0.7m.
[0045] In the embodiment, the composite geogrid 4 is a mesh-shaped hexagon, and is integrally formed by punching and directional stretching of a three-layer co-extruded composite polymer plate, the middle layer of the three layers is a tensile layer, and the outer two layers are PE high-molecular nano energy-absorbing material polymer layers, which have strong durability and flexibility and can adapt to a larger deformation coefficient, and the three-layer mesh structure and high-strength performance of the composite geogrid 4 can enlarge the laying layer spacing of the composite geogrid 4, thereby reducing the material usage and reducing the engineering cost.
[0046] Specifically, as Figure 3As shown, the composite geogrid 4 includes a plurality of small hexagonal structures and a plurality of triangular structures, the plurality of small hexagonal structures are distributed in three rows, and the plurality of small hexagonal structures integrally form a hexagon, and the plurality of triangular structures are respectively distributed in the gaps between adjacent small hexagonal structures.
[0047] The small hexagonal structure includes a central hexagonal structure and a plurality of trapezoidal structures, the central hexagonal structure is arranged at the center of the small hexagonal structure, and the plurality of trapezoidal structures are arranged around the central hexagonal structure in turn, and the bottom edges of the plurality of trapezoidal structures are connected in turn to form the small hexagonal structure.
[0048] The mesh of the composite geogrid 4 in the embodiment is various polygonal structures, which is different from the single mesh shape of other geogrids, and is suitable for the actual working condition that the particle size of the engineering filler is uneven, can better interlock and constrain various roadbed fillers, and has a good limiting effect on the soil body, so as to limit the lateral displacement of the soil foundation and improve the stability of the roadbed, reinforce the overall slab strength of the roadbed, and control the uneven settlement of new and old roads.
[0049] As shown in Figure 4 As shown, the central hexagonal structure and the trapezoidal structure are both hollow structures formed by a plurality of ribs 6, and the cross-sectional shape of the rib 6 is rectangular.
[0050] The radial tensile chord modulus of the composite geogrid 4 at 2% strain is greater than or equal to 130 kN / m, and the strength retention rates of the oxidation resistance, the ultraviolet resistance, and the acid and alkali liquid resistance are all greater than or equal to 90%.
[0051] The composite geogrid 4 is bound into a whole by binding the longitudinal intervals with a spacing of 10 meters, as shown in Figure 2 As shown, the joint 5 of the adjacent composite geogrids 4 in the composite geogrid mesh is overlapped by a width of not less than 30 cm, and the composite geogrid mesh is fixed along the longitudinal direction of the line by using U-shaped nails.
[0052] The embodiment not only improves the stability and bearing capacity of the embankment, but also solves the settlement problem of the embankment, thereby ensuring the construction quality and later operation safety of the high fill embankment, reducing the occurrence of railway roadbed diseases, thereby reducing maintenance and repair costs, and having good economic benefits.
[0053] The filling process of the embodiment is as follows:
[0054] 1. The ground surface is flattened and rolled to the specified requirements, and then the embankment is filled in layers, and the ground transverse slope is stepped in the section with a slope of 1:5, and the bottom width is not less than 2.0 m.
[0055] 2. The road shoulder of the embankment slope range is reserved for settlement widening section in the section with a filling height greater than 15 m.
[0056] 3. For embankment slope with filling height greater than 6m, every 0.6m high from the ground, a layer of composite geogrid mesh is laid within the embankment slope horizontal width of 4m, and anchored with anchor nails inside the embankment, laid until the bottom of the upper structure of the subgrade; for embankment section with filling height greater than 25m and peak acceleration of ground motion greater than or equal to 0.2g, and embankment with filling height greater than 12m, every 2m apart, a layer of composite geogrid mesh is laid within the slope below the bottom layer of the embankment subgrade, and the vertical distance between the first layer of composite geogrid mesh under the slope platform and the slope platform is not less than 0.7m.
[0057] 4. The longitudinal interval of the composite geogrid 4 is bound into a whole by binding with a string every 10m, the joint 5 of the adjacent composite geogrid 4 overlaps each other with a width not less than 30cm, and the composite geogrid mesh is fixed along the line longitudinal direction by using U-shaped nails.
[0058] The above application of specific examples to the utility model is described, which is only used to help understand the utility model, and does not limit the utility model. For the skilled in the art to which the utility model belongs, according to the idea of the utility model, a number of simple deductions, deformations or substitutions can be made.
Claims
1. A reinforced railway high embankment structure, comprising an embankment lower part (1), an embankment middle part (2) and an embankment upper part (3) layered from bottom to top, characterized in that: a plurality of composite geogrid meshes are laid in the embankment slope on both sides from the embankment lower part (1) to the embankment upper part (3), and a plurality of composite geogrid meshes are laid in the embankment middle part (2) from bottom to top, and the composite geogrid meshes are anchored to the inside of the embankment; for the embankment with a filling height greater than 12m, a layer of the composite geogrid mesh is laid in the embankment slope every 2m from the bottom of the embankment bed; the composite geogrid mesh comprises a plurality of composite geogrids (4) in a mesh structure; the composite geogrid (4) is hexagonal; the composite geogrid (4) comprises a plurality of small hexagonal structures and a plurality of triangular structures, the plurality of small hexagonal structures are distributed in multiple rows, and the plurality of small hexagonal structures as a whole are hexagonal, and the plurality of triangular structures are distributed in the gaps between adjacent small hexagonal structures.
2. The reinforced railway high embankment structure according to claim 1, characterized in that: a settlement widening section is reserved on the road shoulder of the embankment slope section with a filling height greater than 15m.
3. The reinforced railway high embankment structure according to claim 1, characterized in that: the small hexagonal structure comprises a central hexagonal structure and a plurality of trapezoidal structures, the central hexagonal structure is arranged at the center of the small hexagonal structure, and the plurality of trapezoidal structures are arranged around the central hexagonal structure in turn.
4. The reinforced railway high embankment structure according to claim 3, characterized in that: the central hexagonal structure and the trapezoidal structure are both hollowed out by a plurality of ribs (6).
5. The reinforced railway high embankment structure according to claim 4, characterized in that: the rib (6) comprises three layers.
6. The reinforced railway high embankment structure according to claim 5, characterized in that: the three layers are an intermediate tensile layer and a high-molecular nano energy-absorbing material polymer layer on both sides of the tensile layer.
7. The reinforced railway high embankment structure according to claim 5, characterized in that: the cross-sectional shape of the rib (6) is rectangular.
8. The reinforced railway high embankment structure according to claim 1, characterized in that: the joints (5) of adjacent composite geogrids (4) in the composite geogrid mesh are overlapped with each other.