Highway high fill member, roadbed and construction method thereof

Abstract

The application discloses a highway high fill component, a roadbed and a construction method thereof, the highway high fill component comprising: an L-shaped component composed of a reinforced concrete bottom plate and a gravity type face plate; a plurality of reinforced concrete inner rib bones uniformly arranged on the inner side of the L-shaped component; and a plurality of ribbed steels arranged inside the L-shaped component along the shape of the L-shaped component. The highway high fill roadbed comprises a drainage system and the highway high fill component, and the highway high fill component is installed on the steps of the original slope excavation; the gravity type face plate of each highway high fill component is arranged opposite to the side surface of the step, and the reinforced concrete bottom plate is anchored by inserting the first anchor rod into the original slope; and the highway high fill component with the reinforced concrete outer rib bone is arranged on the step of the original slope close to the slope foot. The highway high fill component guarantees the influence of the stability of the fill slope and shortens the width of the excavation steps.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of highway construction, and relates to a highway high fill component, a roadbed and a construction method thereof. BACKGROUND

[0002] With the development of highways in China, the current has entered a comprehensive standardization and high-quality development stage, and the construction quality requirements of highways are increasingly improved. However, with the extensive construction of highways, the possibility of encountering adverse geological conditions increases, and excavation or filling is often required in places with limited topography. The use of new soil in the filling of the slope will inevitably lead to poor strength and connectivity of the soil at the junction of new and old soil, and under the action of external factors such as static load, live load and water infiltration, landslides are prone to occur. Once a landslide occurs, it will cause damage to the highway pavement, not only easy to cause casualties, but also greatly increase the cost of later maintenance and reconstruction, so more and more highway slope filling construction methods have emerged.

[0003] However, the traditional highway filling construction method is to excavate the filling slope into a ladder type first when the filling roadbed base is located on a slope with a natural slope greater than 1:5, and then fill the soil layer by layer. When designing the stability of the filling slope, the slope is required to be gentle, and the width of the excavated step is generally not less than 1m, which will cause the slope foot to stretch far away and occupy a large area, thereby increasing the engineering cost and also occupying and wasting land resources. SUMMARY

[0004] The purpose of the embodiment of the present application is to provide a highway high fill component, a roadbed and a construction method thereof, so as to solve the problem that when the filling roadbed base is located on a slope with a natural slope greater than 1:5, the existing highway filling construction method requires a large width of the excavated step to ensure the stability of the filling slope, which causes the slope foot to stretch far away when filling high, thereby increasing the engineering cost and also occupying and wasting land resources.

[0005] The first technical solution adopted by the embodiment of the present application is: a highway high fill component, comprising:

[0006] An L-shaped component composed of a reinforced concrete bottom plate and a gravity type panel, the gravity type panel being perpendicular to the reinforced concrete bottom plate;

[0007] A plurality of reinforced concrete inner ribs are uniformly arranged on the inner side of the L-shaped component;

[0008] Ribbed steel bars, the ribbed steel bars being L-shaped, and a plurality of ribbed steel bars being arranged inside the L-shaped component along the shape of the L-shaped component.

[0009] Further, the outer side of the gravity type panel of the L-shaped component is provided with a reinforced concrete outer rib.

[0010] Further, the side of the reinforced concrete outer rib is a right-angled trapezoid with the upper side being smaller than the lower side, and the right angle side of the right-angled trapezoid is connected with the center of the gravity type panel.

[0011] Further, the gap between the two adjacent reinforced concrete inner ribs is greater than the thickness of the reinforced concrete inner rib and less than twice the thickness of the reinforced concrete inner rib.

[0012] The height of the L-shaped component is greater than or equal to the height of the reinforced concrete outer rib, and the height of the reinforced concrete outer rib is greater than the height of the reinforced concrete inner rib.

[0013] The top surface and the bottom surface of the reinforced concrete outer rib have the same width and the width is greater than twice the thickness of the reinforced concrete inner rib.

[0014] The second technical solution adopted by the embodiment of the present application is: a highway high fill embankment, comprising:

[0015] The highway high fill component is installed on the steps of the original slope excavation; the highway high fill component weakens the influence of the lateral pressure of the soil on the stability of the fill slope by using the self-weight of the soil, so that the stability of the fill slope is ensured without the limitation of designing a gentle slope and the width of the excavated step being greater than 1m.

[0016] Wherein:

[0017] The gravity type panel of each highway high fill component is arranged opposite to the side surface of the step;

[0018] The reinforced concrete bottom plate of each highway high fill component is anchored by inserting the first anchor rod into the original slope;

[0019] The step on the original slope which is less affected by the lateral pressure of the outside fill, i.e. the step close to the slope toe, is provided with the highway high fill component with the reinforced concrete outer rib.

[0020] Further, the highway high fill embankment comprises a drainage system, and the drainage system comprises:

[0021] The water interception ditch is built on the top of the original slope;

[0022] The first drainage ditch is arranged outside the shoulder of the pavement structure;

[0023] The second drainage ditch is arranged beside the falling platform of the new fill slope toe;

[0024] The first drain pipe is arranged at the joint of the new fill and the old slope, the water inlet end of the first drain pipe is communicated with the first drain ditch, the water outlet end of the first drain pipe is communicated with the second drain ditch, and the water in the first drain ditch is drained to the second drain ditch through the first drain pipe.

[0025] The second drain pipe is arranged in layers and is inclinedly buried, the water inlet end of the second drain pipe is arranged in the soil body of the new fill, and the water outlet end of the second drain pipe is arranged on the slope surface of the new fill.

[0026] Further, the first drain pipe is arranged at the joint of the new fill and the old slope and is arranged in the step shape of the joint surface.

[0027] The upper part of the horizontal pipe section of the first drain pipe, i.e., the part close to the new fill, has water permeability.

[0028] The water inlet end of the first drain pipe is communicated with the first drain ditch through the water inlet pipe, the pipe diameter of the water inlet pipe is smaller than that of the water inlet end of the first drain pipe, and the pipe diameter of the first drain pipe gradually increases from the water inlet end to the water outlet end.

[0029] Further, the new fill slope is provided with a slope support structure.

[0030] The slope support structure is formed by a cast-in-place concrete beam and column frame beam, and the frame beam is fixed by a second anchor rod which is anchored into the soil body and connected with the L-shaped component, and vegetation is planted in the frame.

[0031] The third technical scheme adopted by the embodiment of the application is a highway high fill roadbed construction method, comprising the following steps:

[0032] The steps are excavated on the original slope, and then the foundation surface is cleaned;

[0033] The first drain pipe is arranged along the joint surface of the new and old soil, and the adjacent two first drain pipes are arranged with the high fill component of the highway left in between;

[0034] The high fill component of the highway is arranged from bottom to top in steps and filled with soil.

[0035] After the high fill component of the highway is arranged on all the steps and filled with soil, the slope support structure is built on the highway high fill roadbed slope, the broken platform is laid on the slope bottom, the water interception ditch, the first drain ditch and the second drain ditch are excavated and built, the gravel cushion is laid on the highway high fill roadbed, the pavement structure is built, and the road shoulder is built.

[0036] Further, the specific process of arranging the high fill component of the highway from bottom to top in steps and filling with soil is as follows:

[0037] The first anchor rod to be connected is obliquely inserted into the corresponding position of the slope and a position to be connected with the high fill component of the highway is reserved;

[0038] The high fill component of the highway is installed on the step, and the first anchor rod is rigidly connected with the high fill component of the highway;

[0039] The step layer on which the high fill component of the highway is installed is layered and filled with soil and compacted, and the virtual filling thickness of each layer is related to the compaction method: if a rammer compactor is used, the filling thickness of each layer is 200-250 mm; if manual ramming is used, the filling thickness of each layer is not greater than 200 mm, and after the filling of each layer is completed, the soil is compacted 3-4 times;

[0040] After the soil in each layer is compacted, the ring knife sampling is performed according to the specification to measure the mass density of the dry soil; after the requirement is met, the soil in the layer above is filled, and the second drainage pipe is placed at the required position; since the second drainage pipe is inclined, the second drainage pipe is gradually connected from the bottom to the top during the layered filling, and the installation height of the water inlet end of each section of the second drainage pipe is greater than the height of the current filling layer, so as to facilitate the connection with the next section of the second drainage pipe.

[0041] After the filling of each step layer is completed, the surface is leveled by pulling a line; the places higher than the standard elevation are timely planed according to the line; and the places lower than the standard elevation are filled and compacted.

[0042] The beneficial effects of the embodiment of the application are: the high fill component of the highway adopted in the embodiment of the application weakens the influence of the lateral pressure of the soil on the stability of the filling slope by using the self-weight of the soil body, can shorten the width of the step excavated on the original soil body slope to a certain extent, ensures the same stability effect, reduces the engineering land occupation area and the engineering cost, innovates the drainage system of the high fill roadbed of the highway, enhances the slope stability, reduces the landslide risk, reduces the later maintenance cost, and solves the problem that when the filling roadbed base is located on a slope with a natural slope greater than 1:5, the existing highway filling construction method requires a large width of the excavated step to ensure the stability of the filling slope, causes the slope foot to extend far away during high filling, and increases the engineering cost while occupying and wasting land resources. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0044] Figure 1is a schematic diagram of a three-dimensional structure of a high embankment component of a highway.

[0045] Figure 2 is a schematic diagram of an internal ribbed steel bar of a high embankment component of a highway.

[0046] Figure 3 is a schematic diagram of a three-dimensional structure of a reinforced concrete outer rib of a high embankment component of a highway.

[0047] Figure 4 is a schematic diagram of a structure of a reinforced concrete outer rib, a ribbed steel bar, and a reinforced concrete inner rib of a high embankment component of a highway.

[0048] Figure 5 is a schematic diagram of a structure of a high embankment of a highway.

[0049] Figure 6 is a flowchart of a construction process of a high embankment of a highway.

[0050] In the figure, 1. reinforced concrete bottom plate, 2. gravity-type face plate, 3. reinforced concrete inner rib, 4. ribbed steel bar, 5. reinforced concrete outer rib, 6. first anchor rod, 7. first drain pipe, 8. second drain pipe, 9. slope support structure, 10. falling platform, 11. water interception ditch, 12. first drainage ditch, 13. second drainage ditch, 14. gravel cushion, 15. road surface structure, 16. road shoulder. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0052] Embodiment 1

[0053] The present embodiment provides a high embankment component of a highway, as shown in Figure 1 , comprising:

[0054] L-shaped component, the L-shaped component is composed of a reinforced concrete bottom plate 1 and a gravity-type face plate 2, and the gravity-type face plate 2 is perpendicular to the reinforced concrete bottom plate 1;

[0055] reinforced concrete inner rib 3, the reinforced concrete inner rib 3 is a triangular rib plate, and a plurality of reinforced concrete inner ribs 3 are evenly arranged on the inner side of the L-shaped component;

[0056] ribbed steel bar 4, the ribbed steel bar 4 is L-shaped, and a plurality of ribbed steel bars 4 are arranged in parallel inside the L-shaped component along the shape of the L-shaped component.

[0057] In some embodiments, the outer side of the gravity panel 2 of the L-shaped component is provided with a reinforced concrete outer rib 5, the side of the reinforced concrete outer rib 5 is a right-angled trapezoid with the upper side being larger than the lower side, and the right angle side of the right-angled trapezoid is connected with the center of the gravity panel 2, as shown in Figure 4 .

[0058] In some embodiments, as shown in Figures 1-2 , the length of the L-shaped component is M meters, the width is N meters, and the height is H meters; the thickness of the reinforced concrete bottom plate 1 of the L-shaped component is P meters, and the thickness of the gravity panel 2 of the L-shaped component is O meters; the thickness P of the reinforced concrete bottom plate 1 needs to be calculated to satisfy that no deformation will occur under the action of the upper soil pressure at its placement position; the thickness O of the gravity panel 2 needs to be calculated to satisfy that no deformation will occur under the action of the lateral soil pressure at its placement position and the joint action of the reinforced concrete inner rib 3 and the reinforced concrete outer rib 5.

[0059] In some embodiments, the length of the reinforced concrete inner rib 3 is a meters, the height is b meters, and the thickness is c meters; the adjacent two reinforced concrete inner ribs 3 are spaced apart by d meters; the width N of the L-shaped component needs to ensure that the reinforced concrete inner ribs 3 are uniformly arranged, the gap d between the adjacent two reinforced concrete inner ribs 3 satisfies c < d < 2c (greater than the thickness of the reinforced concrete inner rib 3 and less than twice the thickness of the reinforced concrete inner rib 3), effective support is provided, and deformation and damage of the L-shaped component under soil pressure are prevented.

[0060] In some embodiments, the top surface length of the reinforced concrete outer rib 5 is n meters, the bottom surface length is m meters, the top surface and bottom surface width is k meters, and the height is h meters; the top surface length n and the bottom surface length m of the reinforced concrete outer rib 5 need to satisfy that the lateral force can be provided from top to bottom, so as to achieve sufficient support effect with less material. The height of the L-shaped component is greater than or equal to the height h of the reinforced concrete outer rib 5, and the height h of the reinforced concrete outer rib 5 is adjusted according to the actual soil pressure at the placement position of the L-shaped component: when the lateral pressure at the upper end of the L-shaped component is small, the height of the reinforced concrete outer rib 5 can be slightly lower; when the lateral pressure at the upper end of the L-shaped component is large, the height of the reinforced concrete outer rib 5 can be kept consistent with the height of the L-shaped component to ensure the support effect. The top surface and bottom surface width of the reinforced concrete outer rib 5 is k, as shown in Figure 3 , and the top surface and bottom surface width k of the reinforced concrete outer rib 5 satisfies k > 2c (i.e. the top surface and bottom surface width of the reinforced concrete outer rib 5 is greater than twice the thickness of the reinforced concrete inner rib 3), and the specific size is calculated by the lateral pressure required by the reinforced concrete outer rib 5 at the placement position of the component. In this way, the material can be fully utilized to achieve the best support effect, and only one reinforced concrete outer rib 5 corresponding to the center of the gravity panel 2 can effectively improve the lateral support.

[0061] In some embodiments, the height b of the inner reinforced concrete rib 3 is lower than the top height of the outer reinforced concrete rib 5, so as to provide effective tensile force under lateral earth pressure and prevent the connection between the reinforced concrete base plate 1 and the gravity panel 2 from breaking.

[0062] Example 2

[0063] This embodiment provides a high-fill roadbed for a highway, such as Figure 5 As shown, it includes:

[0064] The highway high fill component described in Example 1 is installed on the steps of the original slope excavation. By utilizing the self-weight of the soil, the highway high fill component weakens the impact of the lateral pressure of the soil on the stability of the fill slope. Therefore, it is not necessary to ensure the stability of the fill slope by designing a gentle slope and limiting the width of the excavated steps to more than 1m, thus effectively reducing the land area occupied by the fill slope.

[0065] in:

[0066] The gravity panel 2 of each highway high embankment component is set opposite to the side of the step on which it is located;

[0067] The reinforced concrete base plate 1 of each highway high fill component is anchored by the first anchor rod 6 inserted into the original slope.

[0068] On the steps of the original slope where the lateral pressure from the outer fill is small, i.e. on the steps near the toe of the original slope, a highway high fill component with reinforced concrete outer ribs 5 is installed.

[0069] After the filling, the total gravity stress generated by the soil on the upper part of each highway high fill component acts on the reinforced concrete base slab 1. The friction between the bottom of the highway high fill component and the soil ensures that it will not slip. The lateral pressure generated by the soil acts on the lateral gravity panel 2. Since the gravity panel 2 and the reinforced concrete base slab 1 form an integral L-shaped component, and multiple reinforced concrete inner ribs 3 are provided on the inner side of the L-shaped component, and ribbed steel bars 4 are provided in the L-shaped component along its shape, the lateral pressure of the soil can be weakened by the self-weight stress of the soil through the L-shaped component. Meanwhile, the L-shaped member is subjected to lateral pressure from the outer fill, which provides lateral support to the gravity panel 2. For the parts subjected to less lateral pressure from the outer fill, a highway high fill member with reinforced concrete outer ribs 5 is used to enhance the lateral support of the gravity panel 2. In addition, the reinforced concrete base plate 1 of each highway high fill member is connected by the first anchor rod 6 and inserted into the original slope to provide lateral tension to the highway high fill member. This design largely weakens the lateral force of the new fill body step by step along the steps, reducing the possibility of landslides.

[0070] In order to further improve the stability of the high fill slope, a new drainage system is designed for the roadbed slope while the high fill member of the highway is added, as shown in Figure 5 The drainage system of the high fill roadbed of the highway comprises:

[0071] A water intercepting ditch 11 is built on the original slope top, and the water on the slope top is mainly intercepted and discharged by the water intercepting ditch 11;

[0072] A first drainage ditch 12 is arranged outside the shoulder 16 of the road surface structure 15 of the road side, and the first drainage ditch 12 receives part of the non-infiltrated water flowing out of the road surface;

[0073] A second drainage ditch 13 is arranged beside the falling platform 10 at the slope foot of the new fill;

[0074] A first drainage pipe 7 is arranged at the junction of the new fill and the old soil of the original slope, the water inlet end of the first drainage pipe 7 is communicated with the first drainage ditch 12, the water outlet end of the first drainage pipe 7 is communicated with the second drainage ditch 13, and the water in the first drainage ditch 12 is discharged to the second drainage ditch 13 through the first drainage pipe 7;

[0075] A second drainage pipe 8 is buried in layers and inclined, and the water inlet end of the second drainage pipe 8 is buried in the soil body of the new fill, and the water outlet end of the second drainage pipe 8 is arranged on the slope surface of the new fill, so as to fully discharge the infiltrated water in the soil body of the new fill;

[0076] For the high fill soil body, in addition to the low strength of the soil body itself, the strength and connectivity of the soil body at the junction of the new fill and the old soil of the original slope are also poor, therefore, the water intercepting ditch 11 is arranged on the original slope, the first drainage ditch 12 is arranged on the road side, the second drainage ditch 13 is arranged beside the falling platform 10 at the slope foot, the first drainage pipe 7 is arranged at the junction of the new fill and the old soil of the original slope, and a plurality of second drainage pipes 8 are buried in layers in the new fill, so as to fully discharge the infiltrated water in the soil body of the new fill, avoid damaging the strength of the soil body itself, and especially avoid the infiltration of water into the junction surface of the new fill and the old soil of the original slope, so as to avoid the landslide of the whole fill.

[0077] In some embodiments, the first drainage pipe 7 is arranged at the junction of the new fill and the old soil of the original slope and is laid in the shape of a step fitting the junction surface;

[0078] The upper part of the horizontal pipe section of the first drainage pipe 7, i.e., the part close to the new fill, has water permeability, so as to discharge the infiltrated water at the junction of the new fill and the old soil of the original slope;

[0079] The water inlet end of the first drain pipe 7 is communicated with the first drain ditch 12 through a water inlet pipe, the pipe diameter of the water inlet pipe is smaller than the pipe diameter of the water inlet end of the first drain pipe 7, the water flow from the first drain ditch 12 into the first drain pipe 7 is limited, and the water from the first drain ditch 12 into the first drain pipe 7 is prevented from being discharged to the new-old soil interface along the horizontal pipe section of the first drain pipe 7, and the pipe diameter of the first drain pipe 7 gradually increases from the water inlet end to the water outlet end, the water flow under the water permeability of the horizontal pipe section containing the first drain pipe 7 is contained, and the water flow in the first drain pipe 7 is prevented from gradually increasing and being discharged to the new-old soil interface from the top of the next horizontal pipe section of the first drain pipe 7 after the water from the new fill soil and the original slope old soil interface enters the first drain pipe 7 along a certain horizontal pipe section of the first drain pipe 7, so as to cause the landslide of the fill soil.

[0080] In some embodiments, the horizontal pipe section of the first drain pipe 7 is provided with a water permeable hole near the top of the new fill soil to have water permeability, and the outer gauze or geotextile forms a filter layer to filter sand and prevent sand from entering the first drain pipe 7 to cause blockage.

[0081] In some embodiments, the new fill soil slope of the highway high fill subgrade is provided with a slope support structure 9 to support the high fill soil slope of the highway high fill subgrade, and further prevent the whole highway high fill subgrade from sliding.

[0082] In some embodiments, the slope support structure 9 adopts cast-in-place concrete beams and columns to form a frame beam, and the second anchor rod connected with the L-shaped member is used to fix the frame beam by being punched into the soil body, specifically, the second anchor rod is connected in advance when the L-shaped member is placed, and finally the frame beam is cast in place, which can further improve the stability of the fill soil, and the frame can be planted with vegetation for slope protection, which can not only achieve the purpose of slope soil fixation, but also ensure the original vegetation greening.

[0083] Embodiment 3

[0084] The embodiment provides a highway high fill subgrade construction method, which comprises the following steps: Figure 6 As shown in the figure, the steps are as follows:

[0085] The original slope is excavated step by step, and then the foundation surface is cleaned;

[0086] The first drain pipe 7 is laid along the new-old soil interface, and the adjacent two first drain pipes 7 are left empty to place the highway high fill member;

[0087] The highway high fill member of embodiment 1 is laid step by step from bottom to top and filled with soil, and the specific process is as follows:

[0088] The first anchor rod 6 to be connected is obliquely inserted into the corresponding position of the slope and the part (such as the welding part) connected with the highway high fill member is reserved;

[0089] The high embankment component of the highway is installed on the steps. Since the outer side of the bottom step has less soil, the lateral pressure of the outer side of the high embankment component of the highway is small, so it is necessary to increase the reinforced concrete outer rib 5 outside the high embankment component of the highway, and the first anchor rod 6 is rigidly connected (such as welding) with the high embankment component of the highway;

[0090] The step layer where the high embankment component of the highway is installed is layered and the soil is compacted. The virtual paving thickness of each layer is related to the compaction method: if a rammer is used for compaction, the paving thickness of each layer is 200-250mm; if manual ramming is used, the paving thickness of each layer is not greater than 200mm, and after the paving of each layer is completed, it is compacted 3-4 times;

[0091] After each layer of soil is compacted, the mass density of the dry soil should be measured by the ring knife sampling according to the specification; after meeting the requirements, the paving of the upper layer is carried out, and the second drainage pipe 8 is placed at the required position. Since the second drainage pipe 8 is inclined, it should be connected step by step from bottom to top during the layered filling. The installation height of the water inlet end of each section of the second drainage pipe 8 is greater than the current filling layer height, which is convenient for connecting with the next section of the second drainage pipe 8. The two connected sections of each second drainage pipe 8 are connected by welding or component splicing according to the material of the selected pipe;

[0092] After each step layer is filled, surface leveling should be carried out, and any place that exceeds the standard elevation should be immediately planed according to the line; any place that is lower than the standard elevation should be supplemented and compacted;

[0093] After the paving of the high embankment component of the highway on all steps is completed and the filling is completed, the slope support structure 9 is built on the high embankment roadbed slope, the broken platform 10 is paved at the slope bottom, the water interception ditch 11, the first drainage ditch 12 and the second drainage ditch 13 are excavated and built, the gravel cushion 14, the pavement structure 15 and the road shoulder 16 are paved on the high embankment roadbed of the highway.

[0094] The construction method mainly aims at the position where the slope needs to be filled during the construction of the highway, can reasonably transform the self-weight pressure of the soil, reduce the damage of the self-weight of the soil to the stability of the slope, reduce the landslide risk of the slope filling, and can optimize the drainage form, and is mainly suitable for the local highway where the contact surface between the newly filled soil and the old soil of the original slope is prone to landslide.

[0095] The above only describes the preferred embodiments of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application is included in the protection scope of the present application.

Claims

1. A highway embankment with high fill, characterized in that, The application relates to a highway high-fill structure, which comprises the following steps: The highway high-fill structure is installed on the steps of the original slope; The gravity type face plate (2) of each highway high-fill structure is arranged opposite to the side of the step; The reinforced concrete bottom plate (1) of each highway high-fill structure is anchored by the first anchor rod (6) inserted into the original slope; The highway high-fill structure with the reinforced concrete outer rib (5) is arranged on the step of the original slope close to the slope foot; The application further comprises a drainage system, which comprises the following components: The water intercepting ditch (11) is built on the top of the original slope; The first drainage ditch (12) is arranged outside the shoulder (16) of the pavement structure (15); The second drainage ditch (13) is arranged beside the falling platform (10) of the new fill slope foot; The first drainage pipe (7) is arranged at the joint of the new fill and the original slope, the water inlet end of the first drainage pipe (7) is communicated with the first drainage ditch (12), and the water outlet end of the first drainage pipe (7) is communicated with the second drainage ditch (13); The second drainage pipe (8) is layered and inclinedly buried, and the water inlet end of the second drainage pipe (8) is buried in the soil body of the new fill, and the water outlet end of the second drainage pipe (8) is arranged on the slope surface of the new fill. The first drainage pipe (7) is arranged at the joint of the new fill and the original slope and is laid according to the step shape of the joint surface; 2. The highway high fill embankment according to claim 1, wherein, The upper part of the horizontal pipe section of the first drainage pipe (7) is close to the new fill and has water permeability; The water inlet end of the first drainage pipe (7) is communicated with the first drainage ditch (12) through a water inlet pipe, the pipe diameter of the water inlet pipe is smaller than that of the water inlet end of the first drainage pipe (7), and the pipe diameter of the first drainage pipe (7) gradually increases from the water inlet end to the water outlet end. The new fill slope is provided with a slope supporting structure (9); 3. The highway high fill embankment according to claim 1 or 2, characterized in that, The slope supporting structure (9) is formed by the cast-in-situ concrete beam and column, the second anchor rod is used to fix the frame beam, the second anchor rod is anchored into the soil body and connected with the L-shaped component, and the vegetation is planted in the frame. The application comprises the following steps:

4. A method of constructing a high embankment roadbed of an expressway, characterized by, The steps are excavated on the original slope, and then the foundation surface is cleaned; The first drainage pipe (7) is laid along the joint surface of the new and old soil, and the adjacent two first drainage pipes (7) are left empty to arrange the highway high-fill structure; The highway high-fill structure is laid from the bottom to the top and filled with soil; After the highway high-fill structure is laid on all the steps and filled with soil, the slope supporting structure (9) is built on the highway high-fill roadbed slope, the falling platform (10) is laid on the slope bottom, the water intercepting ditch (11), the first drainage ditch (12) and the second drainage ditch (13) are excavated and built, the gravel cushion (14) and the pavement structure (15) are laid on the highway high-fill roadbed, and the shoulder (16) is built. The specific process of laying the highway high-fill structure from the bottom to the top and filling with soil is as follows:

5. The highway high fill embankment construction method according to claim 4, wherein The first anchor rod (6) to be connected is obliquely inserted into the corresponding position of the slope and the connecting part of the highway high-fill structure is reserved; ​ The first anchor rod (6) is rigidly connected with the high embankment member of the highway corresponding to the high embankment member of the highway; The step layer on which the high embankment member of the highway is installed is layered and filled with soil and compacted, and the virtual paving thickness of each layer is related to the compaction method: if a rammer compactor is used, the soil thickness of each layer is 200-250 mm; if manual ramming is used, the soil thickness of each layer is not greater than 200 mm, and after the soil of each layer is filled, it is compacted 3-4 times; After the soil of each layer is compacted, the ring knife sampling is carried out according to the specification, and the mass density of the dry soil is measured; after the requirement is reached, the soil of the upper layer is paved, and the second drain pipe (8) is placed at the required position; since the second drain pipe (8) is inclined, the second drain pipe (8) is gradually connected in sections from bottom to top during the layered filling of the soil, and the installation height of the water inlet end of each section of the second drain pipe (8) is greater than the current filling layer height, so as to facilitate the connection with the next section of the second drain pipe (8); After the filling of each step layer is completed, the surface is leveled by pulling a line; the places higher than the standard elevation are timely planed according to the line; the places lower than the standard elevation are supplemented and compacted.

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