Reinforced Steep Slope Embankment with the Co - action of Geocell and Geogrid and Construction Method

Abstract

The present invention provides a reinforced steep slope embankment and a construction method in which geocells and geogrids act together. The reinforced steep slope embankment includes a slope surface of the steep slope embankment. A plurality of layers of geogrids are horizontally laid starting from the slope surface of the steep slope embankment. The sides of the plurality of layers of geogrids away from the slope surface of the steep slope embankment are arranged in a stepped manner with layer-by-layer dislocation. The subgrade fill below each layer of geogrid is leveled and compacted; A plurality of layers of geocells are horizontally laid along the side of the geogrid away from the slope surface of the steep slope embankment. The plurality of layers of geocells are arranged in a stepped manner with dislocation along the direction away from the slope surface of the steep slope embankment. The overlapping parts of the geogrid and the geocell are connected and fixed by fixing connecting rods. By laying geocells and geogrids horizontally in the embankment, the present invention makes the entire slope more stable and safe, prevents soil erosion and protects against the scouring of rainwater and surface runoff, and further consolidates the stability of the slope.

Description

Technical Field

[0001] The present invention relates to the technical field of slope protection embankment construction, and particularly relates to a reinforced steep embankment in which a geocell and a geogrid act together and a construction method thereof. Background Art

[0002] Slopes are an important part of road engineering and are directly related to the safe use of road operations. With the rapid development of our country, as well as the increasing emphasis on environmental protection and the requirement of rational utilization of resources, it is necessary to ensure the slope stability to enable the smooth progress of construction and ensure the quality of highway construction, and at the same time effectively restore the ecology along the line, minimize the damage to the natural environment, and make the protection project coordinated with the surrounding environment and natural landscape. Realizing the concept of building an environmentally friendly expressway is one of the key technical problems faced by this expressway. Since the 20th century, technicians have developed a variety of road slope protection methods: (1) Shotcreting and shotcrete, which are mainly applicable to soft rocks prone to weathering, rock cut slopes with developed fissures and joints, uneven slopes, and severely broken rocks. It can not only prevent further weathering of the slope surface, but also promote the filling of mortar in the broken rocks between the fissures for reinforcement. Although using this kind of protection measure can play a role in stabilizing the slope, its labor intensity is relatively large, it is not conducive to the protection of the ecological environment, and it is not coordinated with the road environment landscape. (2) Embankments in filling sections mostly use geosynthetics (such as geocells, geogrids, geonet pads) to stabilize slopes. Although this kind of protection measure has played a certain positive role in engineering practice, there are also some deficiencies, mainly manifested in that using a single geosynthetic will reduce its frictional resistance with the slope surface, the formed protection layer is relatively thin, and the erosion resistance ability is small. When the water flow is large, surface shedding is likely to occur, and then develop into subgrade diseases. (3) Gravity retaining walls rely on their own gravity to balance the soil mass. Generally, the form is simple, the construction is convenient, the masonry work volume is large, and the requirements for the foundation are also relatively high. There are obvious deficiencies in its use. Especially, the slope surface cannot be greened. When it is used in the retaining structures of steep embankments and cut slopes, it not only affects the landscape along the road, but also does not conform to the environmental protection concept and the carbon neutrality thought. Therefore, with the rapid development of society and economy, people's attention to environmental and ecological protection and the carbon reduction concept, it is gradually realized that highways not only need to undertake the function of rapid transportation, but also are given the requirements of protecting the ecology and beautifying the environment. Therefore, fully considering the vegetation greening along the line, less energy consumption, and the coordination between highway structures and the road environment along the line in highway construction has gradually become the consensus of the whole society. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: how to achieve applicability under various conditions such as clay rock slopes with poor diagenesis and water gushing areas while protecting the slope, and can adapt to foundation deformation and improve economy.

[0004] The technical solution of the present invention to solve the above technical problems is as follows:

[0005] The present invention provides a reinforced steep slope embankment in which geocells and geogrids act together, including the slope surface of the steep slope embankment. Multiple layers of geogrids are horizontally laid from the toe of the slope surface of the steep slope embankment. The sides of the multiple layers of geogrids away from the slope surface of the steep slope embankment are arranged in a stepped shape in a horizontal direction layer by layer. The subgrade fill under each layer of geogrid is leveled and compacted; multiple layers of geocells are horizontally laid along the side of the geogrid away from the slope surface of the steep slope embankment. The multiple layers of geocells are arranged in a stepped shape in a horizontal direction away from the slope surface of the steep slope embankment; a lap portion is provided between each layer of geogrid and geocell, and fixed connecting rods are arranged at the overlapping part. The fixed connecting rods penetrate through the overlapping part of the geocell and the geogrid and are anchored into the subgrade fill under the overlapping part; green vegetation is planted on the exposed part above the outermost side of the multiple layers of geocells; drainage ditches are provided on the ground outside the lowermost layer of geocells and on the upper side of the slope surface of the steep slope embankment.

[0006] The beneficial effects of the present invention are: By laying geocells and geogrids flat in the embankment, compared with the traditional concrete panel with geogrid reinforcement structure, or using a single geocell retaining wall and geogrid-reinforced embankment, the entire slope is made more stable and safe, preventing soil erosion and protecting against the scouring of rainwater and surface runoff. Further consolidating the stability of the slope while reducing the amount of cement used and saving energy consumption. Through the organic combination of geosynthetics and plant protection, not only is the entire slope made more stable, safe and its service life extended, but also the economy is improved, construction labor is saved, efficiency is increased, costs are reduced, and it plays an important role in environmental protection and also conforms to the concept of dual-carbon development.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] The geocell is a hot-melt welded geocell, with a height of 10 - 20 cm, a square grid shape, and a grid size of 20 cm - 40 cm.

[0009] The height of the subgrade fill compacted between adjacent layers of geogrids is 2 times the height of the geocell. The subgrade fill on each layer is in a two-level stepped shape along the side away from the slope surface of the steep slope embankment, and each level of the stepped shape is equal in height to the geocell.

[0010] The fixed connecting rod is composed of an upper connecting nut rod and a lower connecting threaded rod. The upper end of the lower connecting threaded rod extends into the upper connecting nut rod and is screwed; the upper connecting nut rod is provided with an ear handle (9) and a nut.

[0011] The overlapping length of the geocell connected to the geogrid along the direction away from the slope of the steep embankment is 40m - 80cm, and the offset distance between every two adjacent layers of geocells along the direction away from the slope of the steep embankment is 30cm - 60cm.

[0012] Furthermore, green vegetation is planted on the exposed part above the geocell.

[0013] The beneficial effect of the above further scheme is: preventing soil erosion and preventing the scouring of rainwater and surface runoff, further consolidating the stability of the slope, and increasing the service life of the entire project.

[0014] Furthermore, drainage ditches are provided on the ground outside the outermost layer of geocell and on the upper side of the slope of the steep embankment.

[0015] The beneficial effect of the above further scheme is: timely discharging the excess rainwater, avoiding the accumulation of rainwater and scouring the slope and the road surface, and increasing the service life of the entire project.

[0016] Furthermore, fixing nails are arranged on each layer of the geogrid, and the fixing nails penetrate through the geogrid and are anchored into the subgrade fill under this layer of geogrid.

[0017] The beneficial effect of the above further scheme is: enhancing the anti-lateral force ability and making the entire slope more stable and safe.

[0018] Furthermore, fixing connecting rods are arranged at the overlapping part of the geogrid and the geocell on each layer, and are anchored into the subgrade fill under this overlapping part.

[0019] The beneficial effect of the above further scheme is: reducing the overlapping length of the geogrid and the geocell, saving the usage amount of the geogrid, saving resources, and at the same time enhancing the anti-lateral ability and stabilizing the slope.

[0020] Furthermore, the height of the subgrade fill between two adjacent layers of geogrids is twice the height of the geocell, and the subgrade fill on the side away from the slope of the steep embankment for each layer is in a two-step shape, and each step is of the same height as the geocell.

[0021] The beneficial effect of the above further scheme is: making the combination of the geogrid and the geocell more integral, and making the entire slope more stable and safe.

[0022] Furthermore, the height of each layer of geocell is 10 - 20 cm.

[0023] The beneficial effect of the above further scheme is: facilitating the corresponding two layers of standard geocells.

[0024] Furthermore, each layer of the geocell is overlapped with the connected geogrid by 40 - 80 cm in the direction away from the slope of the steep embankment, and the adjacent two layers of geocells are overlapped by 30 - 60 cm in the direction away from the slope of the steep embankment.

[0025] The beneficial effect of the above further scheme is that the combination of the geogrid and the geocell has better integrity, and the whole slope is more stable and safe.

[0026] Furthermore, the geocell is a hot melt welded geocell.

[0027] The beneficial effect of the above further scheme is that it is convenient to construct according to the shape of the slope of the steep embankment and convenient to lay the geocell.

[0028] The present invention also provides a construction method of a reinforced steep embankment in which the above geocell and geogrid act together, including the following steps:

[0029] Step 1: After cleaning and leveling the road surface on the lower side of the slope of the steep embankment, lay at least one layer of geogrid along the road surface, and anchor the geogrid with fixing nails. At the same time, lay at least one layer of geocell, and anchor the fixing connecting rod into the overlapping part of the geogrid and the geocell. Backfill the subgrade soil with a height equal to the height of one geocell on the geogrid and the geocell, and level and compact it.

[0030] Step 2: Lay at least one layer of geocell on the edge of the subgrade soil in Step 1, backfill the subgrade soil with a height equal to the height of one geocell, and then level and compact it.

[0031] Step 3: Lay the geogrid and the geocell on the outside and above the subgrade soil with a height equal to the height of one geocell, and anchor the fixing connecting rod into the overlapping part of the geogrid and the geocell. Then repeat the above steps on the subgrade soil with a height equal to the height of one geocell until the construction of the slope of the steep embankment is completed, construct the drainage ditch, and plant green vegetation. Finally, cover a layer of breathable black geotextile on the geocell.

[0032] The beneficial effect of the construction method of the present invention is that it can effectively avoid the situation that the use of a single geocell material or the direct use of plant protection measures cannot fully exert its functionality, thereby affecting the stability and safety of the embankment slope. The organic combination of geocells, geogrids and plant protection not only conforms to the environmental protection concept, but also is more economical, and can extend the service life of the slope. When there is abundant rain, the black geotextile can prevent a large amount of rain from seeping into the slope. When there is abundant sunlight, the black geotextile can prevent the evaporation of rainwater, so as to ensure the survival of the vegetation, and further ensure the stability of the steep embankment. Description of the Drawings

[0033] Figure 1 This is a schematic structural diagram of the present invention.

[0034] Figure 2 This is an arrangement diagram of the geogrid.

[0035] Figure 3 This is an arrangement diagram of the geocell.

[0036] Figure 4 This is a schematic structural diagram of the fixed connecting rod.

[0037] In the attached drawings, the technical features represented by each reference numeral are as follows:

[0038] 1 - Drainage ditch; 2 - Green vegetation; 3 - Geocell; 4 - Subgrade fill; 5 - Fixing nail; 6 - Geogrid; 7 - Slope surface of steep embankment; 8 - Fixed connecting rod; 9 - Ear handle; 10 - Upper connecting nut rod; 11 - Nut; 12 - Lower connecting threaded rod. Detailed implementation manners

[0039] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0040] Refer to the present invention Figures 1-3 .

[0041] In the first embodiment, as Figures 1-3 shown:

[0042] The present invention provides a reinforced steep embankment in which geocells and geogrids act together, including the slope surface 7 of the steep embankment. A plurality of layers of geogrids 6 are horizontally laid from the toe of the slope surface 7 of the steep embankment. The sides of the plurality of layers of geogrids 6 away from the slope surface 7 of the steep embankment are arranged in a stepped manner in a horizontal direction layer by layer. Below each layer of geogrid 6, the subgrade fill 4 is leveled and compacted; A plurality of layers of geocells 3 are horizontally laid along the side of the geogrid 6 away from the slope surface 7 of the steep embankment. The plurality of layers of geocells 3 are arranged in a stepped manner in a horizontal direction away from the slope surface 7 of the steep embankment; Each layer of geogrid 6 and geocell 3 is provided with an overlapping part, and a fixed connecting rod 8 is arranged at the overlapping part. The fixed connecting rod 8 penetrates through the overlapping part of the geocell 3 and the geogrid 6 and is anchored into the subgrade fill 4 under the overlapping part; Green vegetation 2 is planted on the exposed part above the outermost side of the plurality of layers of geocells 3; Drainage ditches 1 are provided on the ground outside the outermost layer of geocells 3 and on the upper side of the slope surface 7 of the steep embankment.

[0043] Principle: The present invention is applicable to steep embankments. Particularly, for high embankments with a slope height greater than 16m or steep embankments with a ground slope steeper than 1:2.5 and a slope height greater than 8m, on the premise of good foundation conditions and the embankment itself meeting the stability requirements, multiple layers of geocells 3 and geogrid 6 should be respectively laid in layers below the road surface, near the middle platform of the embankment, and at the bottom of the embankment. When the geocells 3 and geogrid 6 are applied to reinforce the steep embankment, the geocells 3 are placed on top of the geogrid 6, and the geocells 3 play an anchoring role. At the same time, green vegetation 2 is planted within the slope of the steep embankment, thus forming an organic combination protection method of organic materials and vegetation, thereby avoiding disasters such as slope damage and instability caused solely by the singularity of plant protection or geotechnical material protection. Therefore, the two protection methods are organically combined and superimposed to maximize the stability and safety of the embankment slope, and at the same time, control the soil and water loss and slope erosion of the slope within a safe range, and improve the service life of the entire project.

[0044] The beneficial effects of the present invention are as follows: By laying the geocells 3 and geogrid 6 flat in the embankment, the entire slope becomes more stable and safe, preventing soil and water loss and preventing the erosion of rainwater and surface runoff, and further consolidating the stability of the slope. Through the organic combination of geosynthetics and plant protection, not only does the entire slope become more stable, safe and have an increased service life, but also the economy is improved, the construction labor is saved, the efficiency is increased, and the cost is reduced.

[0045] Embodiment 2:

[0046] In the above embodiments, the following improvements can also be made:

[0047] Further, the fixed connecting rod 8 is composed of an upper connecting nut rod 10 and a lower connecting threaded rod 12. The upper end of the lower connecting threaded rod 12 extends into the upper connecting nut rod 10 and is screwed; the upper connecting nut rod 10 is provided with an ear handle 9 and a nut 11.

[0048] Further, the height of the subgrade filling 4 between two adjacent layers of geogrid 6 after compaction is 2 times the height of the geocell 3. Each layer of subgrade filling 4 is in a two-stage stepped shape on the side away from the slope surface 7 of the steep embankment, and each stage of the stepped shape is of the same height as the geocell 3.

[0049] Further, green vegetation 2 is planted on the exposed part above the geocell 3.

[0050] The beneficial effects of the above further solutions are as follows: Preventing soil and water loss and preventing the erosion of rainwater and surface runoff, further consolidating the stability of the slope, and improving the service life of the entire project.

[0051] Furthermore, a drainage ditch 1 is provided on the ground outside the outermost layer of geocells 3 and on the upper side of the slope of the steep embankment 7.

[0052] The beneficial effect of the above further solution is that the excess rainwater is drained in time, avoiding the accumulation of rainwater and the erosion of the slope and the road surface, and improving the service life of the entire project.

[0053] Furthermore, fixing nails 5 are arranged on each layer of the geogrid 6. The fixing nails 5 penetrate through the geogrid 6 and are anchored into the subgrade fill 4 below this layer of geogrid 6.

[0054] The beneficial effect of the above further solution is that the ability to resist lateral forces is enhanced, making the entire slope more stable and safe.

[0055] Furthermore, fixing connecting rods 8 are arranged at the overlapping part of each layer of the geogrid 6 and the geocell 3. The fixing connecting rods 8 are at the overlapping part of the geogrid 6 and the geocell 3 and are anchored into the subgrade fill 4 below this overlapping part.

[0056] The beneficial effect of the above further solution is that the overlapping part of the geogrid 6 and the geocell 3 is reduced, saving the amount of the geogrid 6, saving resources, and at the same time further enhancing the ability to resist lateral forces and stabilizing the slope.

[0057] Furthermore, the height of the subgrade fill 4 between adjacent two layers of geogrids 6 is twice the height of the geocell 3. Each layer of subgrade fill 4 is in a two - step shape along the side away from the slope of the steep embankment 7, and each step is of the same height as the geocell 3.

[0058] The beneficial effect of the above further solution is that the combination integrity of the geogrid 6 and the geocell 3 is better, and the entire slope is more stable and safe.

[0059] Furthermore, the height of each layer of geocell 3 is 10 - 20 cm.

[0060] The beneficial effect of the above further solution is that it is convenient to use standard geocells 3 and convenient for obtaining materials.

[0061] Furthermore, the height of the subgrade fill 4 between adjacent two layers of geogrids 6 is 20 - 40 cm.

[0062] The beneficial effect of the above further solution is that it is convenient to correspond to two layers of standard geocells 3.

[0063] Furthermore, each layer of the geocell 3 overlaps with the connected geogrid 6 by 40 - 80 cm along the direction away from the slope of the steep embankment 7, and the adjacent two geocells 3 overlap with each other by 30 - 60 cm along the direction away from the slope of the steep embankment 7.

[0064] The beneficial effects of the above further solution are as follows: The combination of the geogrid 6 and the geocell 3 has better integrity, and the entire slope is more stable and safe.

[0065] Furthermore, the geocell 3 is a hot melt welded geocell.

[0066] Note: The grid shape of the geocell 3 is square, and the dimensions of the geocell 3 are as follows: height 10 - 20 cm, grid size 20 cm - 40 cm, cell wall thickness 1.2 mm. Among them, the tensile strength at the joint between groups of the geocell 3 is greater than 800 N / cm, the node peeling strength is greater than 500 N / cm, the node shear strength is 800 N / cm, the node tensile strength is greater than 800 N / cm, the anti-ultraviolet retention rate is greater than 80%, the cell wall is a mesh structure, and the drain pipe can pass through; the geogrid 6 is a biaxially stretched plastic type, and its tensile strength is greater than 300 N / cm. Among them, the materials of the fixing nails 5 for fixing and connecting the geocell 3 and the geogrid 6 are both plastic.

[0067] The beneficial effects of the above further solution are as follows: It is convenient to construct according to the shape of the slope embankment slope 7, and it is convenient to lay the geocell 3.

[0068] The present invention also provides a construction method for a reinforced slope embankment in which the above geocell and geogrid act together, including the following steps:

[0069] Step 1: After cleaning and leveling the road surface on the lower side of the slope embankment slope 7, lay at least one layer of geogrid 6 along the road surface, anchor and fix the geogrid 6 with fixing nails 5, and at the same time lay the geocell 3. Arrange fixing connecting rods 8 at the overlapping part of the geogrid 6 and the geocell 3. The fixing connecting rods 8 penetrate through the overlapping part of the geogrid 6 and the geocell 3 and are anchored into the underlying subgrade fill 4. Backfill the subgrade fill 4 with a height equal to one time the height of the geocell 3 on the geogrid 6 and the geocell 3, and level and compact it.

[0070] Step 2: Lay the geocell 3 on the edge of the subgrade fill 4 in Step 1, backfill the subgrade fill 4 with a height equal to one time the height of the geocell 3, and then level and compact it.

[0071] Step 3: Lay the geocell 3 and the geogrid 6 on the outside and above the subgrade fill 4 with a height equal to one time the height of the geocell 3. Arrange fixing connecting rods 8 at the overlapping part of the geogrid 6 and the geocell 3. The fixing connecting rods 8 penetrate through the overlapping part of the geogrid 6 and the geocell 3 and are anchored into the underlying subgrade fill 4. Then repeat the above steps on the subgrade fill 4 with a height equal to one time the height of the geocell 3 until the construction of the slope embankment slope is completed, construct the construction drainage ditch 1, and plant green vegetation 2. Finally, cover a layer of breathable black geotextile on the geocell 3.

[0072] The beneficial effects of the construction method of the present invention are as follows: It can effectively avoid the situation where the functionality cannot be fully exerted due to the use of a single geogrid material or directly adopting plant protection measures, thus affecting the stability and safety of the embankment slope. The organic combination of the geocell 3, the geogrid 6 and plant protection not only conforms to the environmental protection concept, but also is more cost-effective economically, and can extend the service life of the slope. When there is abundant rain, the black geotextile can prevent a large amount of rain from seeping into the slope. When there is abundant sunlight, the black geotextile can prevent rainwater from evaporating. This ensures the survival of the vegetation and further guarantees the stability of the steep embankment slope.

[0073] In the description of the present invention, it should be understood that if descriptive terms indicating orientation, direction or position relationship appear, such as: "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or position relationship indicated in this specification is based on the orientation or position relationship shown in the drawings. It is only for the convenience of understanding the present invention and simplifying the description, rather than indicating or implying that the part, component or whole referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0074] In addition, if descriptive terms indicating order appear, such as: "first", "second", etc., their use in this specification is for the convenience of understanding or simplifying the description. For example, in order to distinguish multiple technical features of the same type or function and having to be mentioned separately, this specification may use the method of prefixing or suffixing order descriptive terms to distinguish them. Therefore, it should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0075] In the present invention, if descriptive terms for the relative relationship of structures are used, such as "installed", "connected", "joined", "fixed", etc., unless otherwise clearly defined and limited, they should be understood in a broad sense. For example, "installed", "connected", "joined", etc. can be a fixed connection, a detachable connection, or integrated; they can be a mechanical connection or an electrical connection; they can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components; "fixed" can be a fixed integration or a detachable fixation through fasteners; it can be directly fixed or fixed through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above descriptive terms in the present invention can be understood according to specific circumstances, the context, the coherence of the context before and after, etc.

[0076] In the present invention, if descriptive terms with a meaning of attachment or connection appear, for example, a first feature is "on" or "under" a second feature, unless otherwise clearly defined and limited, it should not be understood in a restrictive sense. For example, "on" or "under" can be that the first and second features are in direct contact or the first feature and the second feature are indirectly in contact through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above descriptive terms in the present invention can be understood according to specific circumstances, the context, the coherence of the context before and after, etc.

[0077] Furthermore, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0078] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments, examples, and the features of different embodiments and examples described in this specification, and these combinations or combinations should all fall within the scope summarized by the present invention.

[0079] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of information available through their public channels, in combination with the technical inspiration provided by this application document.

Claims

1. A reinforced steep slope embankment with the combined action of geocell and geogrid, characterized in that: It includes the slope surface (7) of the steep slope embankment. Starting from the toe of the slope of the steep slope embankment surface (7), multiple layers of geogrids (6) are horizontally laid. The sides of the multiple layers of geogrids (6) away from the steep slope embankment surface (7) are arranged in a stepped manner layer by layer. Under each layer of geogrid (6), the subgrade fill (4) is leveled and compacted; along the side of the geogrid (6) away from the steep slope embankment surface (7), multiple layers of geocells (3) are horizontally laid. The multiple layers of geocells (3) are arranged in a stepped manner along the horizontal direction away from the steep slope embankment surface (7). There is an overlapping part between each layer of geogrid (6) and geocell (3), and a fixed connecting rod (8) is arranged at the overlapping part. The fixed connecting rod (8) penetrates through the overlapping part of the geocell (3) and geogrid (6) and is anchored into the subgrade fill (4) under the overlapping part; green vegetation (2) is planted on the exposed part above the outermost side of the multiple layers of geocells (3); drainage ditches (1) are provided on the ground outside the outermost layer of geocells (3) and on the upper side of the steep slope embankment surface (7).

2. The reinforced steep slope embankment with the combined action of geocell and geogrid according to claim 1, characterized in that: The geocell (3) is a hot melt welded geocell, with a height of 10 - 20 cm, the grid shape is square, and the grid size is 20 cm - 40 cm.

3. The reinforced steep slope embankment with the combined action of geocell and geogrid according to claim 1, characterized in that: The height of the subgrade fill (4) between adjacent two layers of geogrids (6) after compaction is 2 times the height of the geocell (3). Each layer of subgrade fill (4) is in a two - step shape along the side away from the steep slope embankment surface (7), and each step is of the same height as the geocell (3).

4. The reinforced steep slope embankment with the combined action of geocell and geogrid according to claim 1, characterized in that: The fixed connecting rod (8) is composed of an upper connecting nut rod (10) and a lower connecting threaded rod (12). The upper end of the lower connecting threaded rod (12) extends into the upper connecting nut rod (10) and is screwed; the upper connecting nut rod (10) is provided with an ear handle (9) and a nut (11).

5. The reinforced steep slope embankment with the combined action of geocell and geogrid according to claim 1, characterized in that: The overlapping part length of the geocell (3) and the connected geogrid (6) along the direction away from the steep slope embankment surface (7) is 40 cm - 80 cm, and the dislocation distance between each adjacent two layers of geocells (3) along the direction away from the steep slope embankment surface (7) is 30 cm - 60 cm.

6. The construction method of the reinforced steep slope embankment with the combined action of geocell and geogrid according to any one of claims 1 - 5, characterized in that: It includes the following steps: Step 1: After cleaning and leveling the road surface on the lower side of the slope embankment slope (7), lay at least one layer of geogrid (6) along the road surface, and anchor and fix the geogrid (6) with fixing nails (5). At the same time, lay geocell (3), and anchor and fix the overlapping part of the geogrid (6) and the geocell (3) with a fixing connecting rod (8). Backfill the roadbed soil (4) with a height equal to that of the geocell (3) on the geogrid (6) and the geocell (3), and level and compact it. Step 2: Lay the geocell (3) on the roadbed soil (4) in Step 1, backfill with the roadbed soil (4) with a height equal to that of the geocell (3), and then level and compact it. Step 3: Lay the geogrid (6) on the outside and above the roadbed soil (4) with a height equal to that of the geocell (3). At the same time, lay the geocell (3), and anchor and fix the overlapping part of the geogrid (6) and the geocell (3) with a fixing connecting rod (8). Then repeat the above steps on the roadbed soil (4) with a height equal to that of the geocell (3) until the construction of the slope embankment slope is completed. Construct the construction drainage ditch (1) and plant green vegetation (2). Finally, cover a layer of breathable black geotextile on the geocell (3).

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