A reinforced soil roadbed conducive to pipeline maintenance

Abstract

The present invention discloses a reinforced soil roadbed that is beneficial to pipeline maintenance, belongs to the technical field of roadbed, and solves the problem in the prior art that the reinforcement material is damaged when burying pipelines during roadbed maintenance, affecting the overall safety of the reinforced roadbed. In the reinforced soil roadbed, the biaxially stretched geogrid and the geocell are detachably connected through a connecting assembly; the biaxially stretched geogrid is hung on a short rod, and the connecting anchor rod passes through the biaxially stretched geogrid, the through hole and the geocell; along the transverse direction of the reinforced soil roadbed, a plurality of spherical protrusions are arranged on the side walls of different grids of the biaxially stretched geogrid, one end of the spring sheet is fixedly connected to the short rod, and the other end of the spring sheet is suspended, and the space between the two spring sheets is an accommodating space, and the accommodating space is divided into a necking section and an accommodating section along the direction gradually approaching the short rod, and the width of the necking section close to one end of the accommodating section is less than the diameter of the spherical protrusion. The present invention can be beneficial to pipeline maintenance.

Description

Technical Field

[0001] The invention belongs to the technical field of roadbed, and in particular relates to a reinforced soil roadbed which is convenient for pipeline maintenance. Background Art

[0002] With the continuous advancement of urban development and infrastructure construction, the laying and maintenance of various pipelines are increasing. Especially in the reinforced earth roadbed of municipal roads, the difficulty of pipeline laying and maintenance construction is one of the main problems currently existing.

[0003] Taking into account the problems of uneven settlement and deformation of the roadbed, geogrids are often added and combined with the original fill to form a reinforced soil roadbed; however, multiple layers of geogrids are laid horizontally in the fill, which leads to the destruction of the reinforced materials when burying pipelines in the roadbed during road operation. This affects the overall safety of the reinforced roadbed; at the same time, in order to prevent pit wall collapse, attention must be paid to pit wall safety during excavation, and pit wall support must be carried out when necessary, which is time-consuming and labor-intensive. Summary of the invention

[0004] In view of the above analysis, the present invention aims to provide a reinforced earth roadbed that is conducive to pipeline maintenance, solving the problem in the prior art that the reinforcement materials are damaged when burying pipelines in the reinforced earth roadbed, affecting the overall safety of the reinforced roadbed; at the same time, it ensures the safety of the pit wall during excavation, eliminates the pit wall support construction, and saves manpower and material resources.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions:

[0006] The present invention provides a reinforced soil roadbed which is convenient for pipeline maintenance, comprising a reinforced area and a pipeline excavation area located in the reinforced area; the pipeline excavation area comprises a filling soil body, a geocell and a covering soil body, the pipeline is buried in the filling soil body, the covering soil body covers the filling soil body, the geocell is located on both sides of the covering soil body and the filling soil body, the covering soil body comprises alternately stacked covering soil layers and a biaxially stretched geogrid, one end of the biaxially stretched geogrid is detachably connected to the geocell on one side through a connecting assembly, and the other end of the biaxially stretched geogrid is detachably connected to the geocell on the other side through a connecting assembly; the connecting assembly comprises a connecting plate, a plurality of The invention discloses a connecting anchor rod, a plurality of short rods, two spring pieces and a plurality of spherical protrusions. The short rod is fixedly connected to the connecting plate. The biaxially stretched geogrid is hung on the short rod. A through hole is provided on the connecting plate. The connecting anchor rod passes through the biaxially stretched geogrid, the through hole and the geocell. Along the transverse direction of the reinforced soil roadbed, a plurality of spherical protrusions are arranged on the side walls of different grids of the biaxially stretched geogrid. One end of the spring piece is fixedly connected to the short rod, and the other end of the spring piece is suspended. The space between the two spring pieces is an accommodating space. The accommodating space is divided into a necking section and an accommodating section along the direction gradually approaching the short rod. The width of the necking section close to one end of the accommodating section is smaller than the diameter of the spherical protrusion.

[0007] Furthermore, the reinforced area includes a unidirectional geogrid, a reinforced soil layer, a geotextile wall and a strip foundation. The strip foundation is located below the geotextile wall. The geotextile wall includes a plurality of geobags stacked from bottom to top. The unidirectional geogrid and the reinforced soil layer are alternately stacked. The end of the unidirectional geogrid close to the geotextile wall is reversely covered with a geotextile bag.

[0008] Furthermore, the unidirectional tensile geogrid below the pipeline excavation area is laid throughout the entire reinforced area.

[0009] Furthermore, there are multiple geocells, and the multiple geocells are divided into multiple groups, and the multiple groups of geocells are symmetrically distributed on both sides.

[0010] Furthermore, from bottom to top, the multiple geocells in each group of geocells are stacked, and the distance from the center line of the pipeline excavation area gradually increases, forming a stepped shape.

[0011] Furthermore, the shape of the pipeline excavation area is an inverted trapezoid.

[0012] Furthermore, in the horizontal direction, the unidirectional tensile geogrids with corresponding positions pass through the gap between two adjacent geocells and are hung on the connecting anchor rods and the short rods.

[0013] Furthermore, the plurality of connecting anchor rods and the plurality of short rods are arranged along the length direction of the connecting plate.

[0014] Furthermore, the reinforced soil roadbed also includes cell soil, the connection plate is in a mesh shape, and the cell soil is filled into the mesh holes of the connection plate and the cells of the geocell.

[0015] Furthermore, a plurality of drainage holes are provided on the wall of the geocell.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] A) The reinforced soil roadbed provided by the present invention is conducive to pipeline maintenance. A pipeline excavation area specially used for laying pipelines is set in the reinforced area, and geocells are set on both sides of the pipeline. When the pipeline needs to be repaired, the pipeline can be repaired by only digging out the covering soil and the filling soil. The unidirectional geogrid and the reinforced soil layer in the reinforced area will not be damaged before and after the pipeline maintenance. The stability of the original roadbed before and after the pipeline maintenance construction can be guaranteed, and the collapse and deformation of the roadbed during the pipeline excavation construction process can be effectively prevented. In addition, the bidirectional stretched geogrid can be reused, and the construction is convenient and quick.

[0018] B) The reinforced soil roadbed that is beneficial to pipeline maintenance provided by the present invention has a strong lateral restraining effect. The horizontally laid unidirectional tensile geogrid is overlapped with the geocell and acts together. During the excavation process of covering soil and filling soil, it can be used as temporary support on both sides of the pit wall, limiting the lateral displacement of the pit wall during the pipeline maintenance excavation process, ensuring the stability of the original structure, and eliminating the need for temporary support procedures, thereby greatly saving construction time and costs. At the same time, the application of the geocell can also increase the bearing capacity and lateral restraint around the pipeline excavation area, making it convenient for construction machinery and personnel to carry out construction before and after pipeline maintenance, and ensuring the safety of personnel and equipment above the pit walls on both sides during the construction process.

[0019] C) The reinforced soil roadbed provided by the present invention is conducive to pipeline maintenance. Conventional reinforced soil structures usually use unidirectional tensile geogrids. Compared with conventional reinforced soil roadbeds, the reinforced soil roadbed provided by this embodiment uses bidirectional tensile geogrids arranged in the covering soil, which can not only provide sufficient lateral restraint force for the structures on both sides of the pipeline excavation area, but also ensure the stability of the covering soil and filling soil in the pipeline excavation area.

[0020] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components;

[0022] Figure 1 A schematic diagram of the cross-sectional structure of a reinforced soil roadbed that is convenient for pipeline maintenance provided in the first embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the structure of a row of buckles in a reinforced soil roadbed that is convenient for pipeline maintenance provided in the first embodiment of the present invention;

[0024] Figure 3 A schematic diagram of the connection of biaxially stretched geogrids, uniaxially stretched geogrids, geocells, connecting anchor rods and buckles in a reinforced soil roadbed that is convenient for pipeline maintenance provided in the first embodiment of the present invention;

[0025] Figure 4 A schematic structural diagram of short rods, spring pieces and spherical protrusions in a reinforced soil roadbed that is convenient for pipeline maintenance provided in the first embodiment of the present invention.

[0026] Reference numerals:

[0027] 1- pipeline; 2- unidirectional geogrid; 3- geocell; 31- drainage hole; 4- bidirectional geogrid; 5- connecting anchor rod; 6- buckle; 61- short rod; 62- connecting plate; 63- through hole; 7- reinforced soil layer; 8- geobag; 9- spherical protrusion; 10- strip foundation; 11- filling soil; 12- covering soil layer; 13- shrapnel. DETAILED DESCRIPTION

[0028] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used to explain the principles of the present invention together with the embodiments of the present invention.

[0029] Embodiment 1

[0030] This embodiment provides a reinforced soil roadbed that is convenient for pipeline maintenance. Figure 1 , including a reinforced area and a pipeline excavation area located in the reinforced area, wherein the pipeline excavation area includes a pipeline 1, a filling soil 11, a geocell 3 and a covering soil, the pipeline 1 is buried in the filling soil 11, the covering soil covers the filling soil 11, and the geocell 3 is located on both sides of the covering soil and the filling soil 11, wherein the covering soil includes alternatingly stacked covering soil layers 12 and a biaxially stretched geogrid 4, one end of the biaxially stretched geogrid 4 is detachably connected to the geocell 3 on one side, and the other end of the biaxially stretched geogrid 4 is detachably connected to the geocell 3 on the other side.

[0031] For the structure of the reinforced area, specifically, it includes a unidirectional geogrid 2, a reinforced soil layer 7, a geotextile wall and a strip foundation 10 (for example, a concrete strip foundation). The strip foundation 10 is located below the geotextile wall. The geotextile wall includes a plurality of geobags 8 stacked from top to bottom. The unidirectional geogrid 2 and the reinforced soil layer 7 are alternately stacked. The unidirectional geogrid 2 is reversely coated with the geotextile bag 8 at one end (tail end) close to the geotextile wall. A layer of unidirectional geogrid 2 reversely coats a plurality of geotextile bags 8 (for example, two geotextile bags 8). The unidirectional geogrid 2 below the pipeline excavation area is laid through the entire reinforced area, thereby enhancing the overall stability and bearing capacity below the pipeline excavation area.

[0032] Compared with the prior art, the reinforced soil roadbed provided in this embodiment is conducive to pipeline maintenance. On the one hand, a pipeline excavation area specially used for laying pipelines is set in the reinforced area, and geocells 3 are set on both sides of the pipeline 1. When the pipeline 1 needs to be inspected, it is only necessary to dig out the covering soil and the filling soil 11 to inspect the pipeline 1. Before and after the inspection of the pipeline 1, the unidirectional geogrid and the reinforced soil layer 7 in the reinforced area will not be damaged. The stability of the original roadbed before and after the inspection and construction of the pipeline 1 can be ensured, and the collapse and deformation of the roadbed during the excavation and construction of the pipeline 1 can be effectively prevented. In addition, the bidirectional stretched geogrid 4 can be reused, and the construction is convenient and quick. On the other hand, since the geocell 3 has a strong lateral constraint effect, the horizontally laid unidirectional tensile geogrid 2 and the geocell 3 are overlapped and work together. During the excavation process of the covering soil and the filling soil 11, it can be used as a temporary support on both sides of the pit wall, limiting the lateral displacement of the pit wall during the inspection and excavation of the pipeline 1, ensuring the stability of the original structure, and no temporary support process is required, which can greatly save construction time and cost. At the same time, the application of the geocell 3 can also increase the bearing capacity and lateral constraint around the pipeline excavation area, facilitating the construction machinery and personnel before and after the inspection of the pipeline 1, and ensuring the safety of personnel and equipment above the pit walls on both sides during the construction process. On the other hand, conventional reinforced soil structures usually use unidirectional tensile geogrids 2. Compared with conventional reinforced soil roadbeds, the reinforced soil roadbed provided in this embodiment uses bidirectional tensile geogrids 4 arranged in the covering soil, which can not only provide sufficient lateral constraints for the structures on both sides of the pipeline excavation area, but also ensure the stability of the covering soil and filling soil 11 in the pipeline excavation area.

[0033] In order to improve the stability during the excavation process, the number of the above-mentioned geocells 3 is multiple, and the multiple geocells 3 are divided into multiple groups, wherein at least one group of geocells 3 is located on one side of the covering soil and the filling soil 11, and the remaining groups of geocells 3 are located on the other side of the covering soil and the filling soil 11. From the perspective of distribution uniformity, the multiple groups of geocells 3 are symmetrically distributed on both sides.

[0034] From bottom to top, multiple geocells 3 in each group of geocells 3 are stacked, and are overlapped layer by layer according to the designed slope ratio on both sides, and the distance from the center line of the pipeline excavation area gradually increases, thereby forming a stepped shape, and then obtaining an inverted trapezoidal pipeline excavation area. In this way, on the one hand, the inverted trapezoidal pipeline excavation area is more stable, which is convenient for the maintenance of the pipeline 1. On the other hand, the side of the geocell 3 away from the pipeline 1 also has a certain slope, which plays a transition role from the pipeline excavation area to the reinforcement area, reducing the influence of different stiffness of different areas of the reinforced soil roadbed.

[0035] In order to form an overall tensioned structure, the geocell 3 is detachably connected to the biaxially stretched geogrid 4 through a connecting assembly. In the horizontal direction, the correspondingly positioned uniaxially stretched geogrid 2 passes through the gap between two adjacent geocells 3 and is overlapped with the geocell 3 and the biaxially stretched geogrid 4 through the connecting assembly to form a complete reinforced structure.

[0036] Specifically, the connection assembly includes a connection anchor rod 5 and a row of buckles 6, see Figures 2 to 3 The buckle 6 includes a connecting plate 62 and a plurality of short rods 61. The size of the connecting anchor rod 5 can be set according to the actual height of the geocell 3. The buckle 6 is fixedly connected to the connecting plate 62. The buckle 6 penetrates the biaxially stretched geogrid 4 and the uniaxially stretched geogrid 2. A through hole 63 is provided on the connecting plate 62. The connecting anchor rod 5 penetrates the biaxially stretched geogrid 4, the uniaxially stretched geogrid 2, the through hole 63 and the geocell 3, so that the above four are tightly connected as a whole, so that the biaxially stretched geogrid 4 is easy to disassemble and is tightly connected with the uniaxially stretched geogrid 2 and the geocell 3, reducing the overlap length of the biaxially stretched geogrid 4 and the uniaxially stretched geogrid 2, providing convenience for construction; at the same time, it can ensure that different reinforcement materials (biaxially stretched geogrid 4 and uniaxially stretched geogrid 2) are uniformly stressed after overlapping, ensuring that the whole is in a tensioned stress state, making the overall structure more stable, and overcoming the problem that the original reinforced structure is easily damaged during pipeline 1 construction.

[0037] It should be noted that when the geocell 3 is multi-layered, the connecting anchor rod 5 penetrates the multi-layered geocell 3, so that the multi-layered geocell 3 also forms an integral structure. In addition, by providing the connecting anchor rod 5, the vertical stability of the reinforced area can also be effectively improved.

[0038] From the perspective of connection stability, there are multiple connection anchoring rods 5 , and the multiple connection anchoring rods 5 and the multiple short rods 61 are all arranged along the length direction of the connection plate 62 .

[0039] As for the arrangement of the connecting anchor rods 5 and the short rods 61, exemplarily, the number of the connecting anchor rods 5 is 3, the number of the short rods 61 is 12, the first connecting anchor rod 5 is arranged at one end of the connecting plate 62, the second connecting anchor rod 5 is arranged at the middle of the connecting plate 62, the third connecting anchor rod 5 is arranged at the other end of the connecting plate 62, and the short rods 61 are divided into 2 groups, the first group of short rods 61 (6 short rods 61) is arranged between the first connecting anchor rod 5 and the second connecting anchor rod 5, and the second group of short rods 61 (6 short rods 61) is arranged between the second connecting anchor rod 5 and the third connecting anchor rod 5. The number of through holes 63 corresponding to the first connecting anchor rod 5 and the second connecting anchor rod 5 is multiple (for example, 3), and the multiple through holes 63 are arranged along the length direction of the connecting holes, so that the tension force of the biaxially stretched geogrid 4 can be adjusted.

[0040] It should be noted that the connection assembly of the above structure is composed of the connecting anchor rod 5 and the short rod 61 on the connecting plate 62, which intersperses different components (i.e., the biaxially stretched geogrid 4, the uniaxially stretched geogrid 2, the through hole 63 and the geocell 3), and is overlapped by the shear resistance of the short rod 61, and the connecting plate 62 plays the role of fixing the short rod 61.

[0041] In practical applications, when the biaxially stretched geogrid 4 is re-laid after the pipeline 1 is overhauled, due to the long-term service of the biaxially stretched geogrid 4, if the connection position of the biaxially stretched geogrid 4 and the short rod 61 is the same, there may be insufficient tension, resulting in the collapse of the road surface in the pipeline excavation area in the later stage. Therefore, the above-mentioned connecting assembly also includes two spring pieces 13 and a plurality of spherical protrusions 9, see Figure 4 , multiple spherical protrusions 9 are all arranged on the grid side walls of the biaxially stretched geogrid 4, and are arranged on different grid side walls along the transverse direction of the reinforced soil roadbed. One end of the spring piece 13 is fixedly connected to the short rod 61, and the other end of the spring piece 13 is suspended. The space between the two spring pieces 13 is an accommodating space. The accommodating space is divided into a necking section and an accommodating section in the direction gradually approaching the short rod 61. The width of the necking section near one end of the accommodating section is smaller than the diameter of the spherical protrusion 9. During the laying process of the biaxially stretched geogrid 4, one of the spherical protrusions 9 is used as a trial protrusion, and the trial protrusion is placed in the diameter reduction section. If the trial protrusion passes through the diameter reduction section and enters the accommodating section, it means that the tensioning force of the biaxially stretched geogrid 4 is sufficient. If the trial protrusion does not enter the accommodating section, it means that the tensioning force of the biaxially stretched geogrid 4 is insufficient. The spherical protrusion 9 on the side of the trial protrusion close to the center line of the pipeline excavation area is used as a new trial protrusion and is placed in the diameter reduction section. In this way, by providing a plurality of spherical protrusions 9 and spring pieces 13, during the re-laying process of the biaxially stretched geogrid 4, it is possible to predict whether the tensioning force of the biaxially stretched geogrid 4 is sufficient, thereby reducing the possibility of road collapse in the later stage.

[0042] In order to improve the stability of the connecting plate 62 in the reinforced soil roadbed, the cells of the above-mentioned geocell 3 are filled with cell soil, and the connecting plate 62 is in a mesh shape, that is, the connecting plate 62 is a perforated plate, and the cell soil is filled into the mesh holes of the connecting plate 62, thereby enhancing the fixing effect of the connecting plate 62 and the cell soil.

[0043] For example, in the reinforced soil roadbed that is convenient for pipeline maintenance, the uniaxially stretched geogrid 2, the biaxially stretched geogrid 4, the geocell 3, the short rod 61 and the connecting anchor rod 5 are all made of high-density polyethylene material.

[0044] In order to facilitate the drainage of the reinforced earth roadbed, a plurality of drainage holes 31 are provided on the wall of the geocell 3, which is beneficial to the drainage inside the reinforced earth roadbed.

[0045] In order to more clearly illustrate the structure of the reinforced soil roadbed, the specific construction method is described in detail below, including the following steps:

[0046] Step 1: Lay a layer of unidirectional geogrid 2, reserve a reverse wrap length at the tail end of the unidirectional geogrid 2, stack geobags 8 filled with coarse sand and gravel on the unidirectional geogrid 2 according to the designed number of layers and level and compact them, reversely wrap the geobag 8 at the tail end of the unidirectional geogrid 2, and connect the reverse wrap part to the main body of the unidirectional geogrid 2 with a connecting rod, lay a reinforced soil layer 7 on the unidirectional geogrid 2, and level and compact it;

[0047] Step 2: Repeat step 1 on the surface of the reinforced soil layer 7 until the reinforcement area below the pipeline excavation area is laid;

[0048] Step 3: According to the designed position of the pipeline excavation area, a layer of unidirectional geogrid 2 is laid, and the tail end of the unidirectional geogrid 2 is reserved with a reversed length. Geobags 8 filled with coarse sand and gravel are stacked on the unidirectional geogrid 2 according to the designed number of layers and leveled and compacted. The tail of the unidirectional geogrid 2 is reversely wrapped with the geobag 8, and the reversed part is connected to the main body of the unidirectional geogrid 2 with a connecting rod;

[0049] Step 4: laying a pair of geocells 3 on the surface of the uniaxial geogrid 2 according to the designed position and designed length, installing a connecting plate 62 on the surface of the geocell 3, passing the connecting anchor rod 5 through the geocell 3 and the lower uniaxial geogrid 2 and extending into the reinforced soil layer 7, laying the reinforced soil layer 7 on the surface of the uniaxial geogrid 2 and the outer side of the pair of geocells 3, laying the uniaxial geogrid 2 on the surface of the reinforced soil layer 7, and hanging the head end of the uniaxial geogrid 2 on the short rod 61 and the connecting anchor rod 5;

[0050] Step 5: Repeat step 4 until the geocell 3 reaches the design elevation, and the geocells 3 on both sides form a construction area for pipeline excavation;

[0051] Step 6: Laying the filling soil 11 in the construction area, and burying the pipeline 1 during the laying of the filling soil 11;

[0052] Step 7: Lay the biaxially stretched geogrid 4 on the surface of the filling soil 11, hang the two ends of the biaxially stretched geogrid 4 on the connecting anchor rod 5 and the short rod 61, lay the covering soil layer 12 on the biaxially stretched geogrid 4, and level and compact it;

[0053] Step 8: Lay the biaxially stretched geogrid 4 on the surface of the covering soil layer 12, hang the two ends of the biaxially stretched geogrid 4 on the connecting anchor rod 5 and the short rod 61, lay the covering soil layer 12 on the biaxially stretched geogrid 4, and level and compact it;

[0054] Step 9: Repeat step 8 until the biaxially stretched geogrid 4 reaches the designed elevation to obtain the covering soil.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A reinforced soil roadbed that is convenient for pipeline maintenance, characterized in that: Including the reinforced area and the pipeline excavation area located in the reinforced area; The pipeline excavation area includes a filling soil body, a geocell and a covering soil body, the pipeline is buried in the filling soil body, the covering soil body covers the filling soil body, the geocell is located on both sides of the covering soil body and the filling soil body, the covering soil body includes alternately stacked covering soil layers and biaxially stretched geogrids, one end of the biaxially stretched geogrid is detachably connected to the geocell on one side through a connecting assembly, and the other end of the biaxially stretched geogrid is detachably connected to the geocell on the other side through a connecting assembly; The connection assembly includes a connection plate, a plurality of connection anchor rods, a plurality of short rods, two spring pieces and a plurality of spherical protrusions, the short rods are fixedly connected to the connection plate, the biaxially stretched geogrid is hung on the short rods, a through hole is provided on the connection plate, and the connection anchor rods penetrate the biaxially stretched geogrid, the through hole and the geocell; Along the transverse direction of the reinforced soil roadbed, a plurality of spherical protrusions are arranged on the side walls of different grids of the biaxially stretched geogrid, one end of the spring sheet is fixedly connected to the short rod, the other end of the spring sheet is suspended, the space between the two spring sheets is the accommodation space, and the accommodation space is divided into a necking section and an accommodation section in a direction gradually approaching the short rod, and the width of the necking section close to one end of the accommodation section is smaller than the diameter of the spherical protrusion; During the laying process of the biaxially stretched geogrid, one of the spherical protrusions is used as a trial protrusion, and the trial protrusion is placed in the reduced diameter section. If the trial protrusion passes through the reduced diameter section and enters the accommodating section, it means that the tension of the biaxially stretched geogrid is sufficient. If the trial protrusion does not enter the accommodating section, it means that the tension of the biaxially stretched geogrid is insufficient. The spherical protrusion on the side of the trial protrusion close to the center line of the pipeline excavation area is used as a new trial protrusion and placed in the reduced diameter section. The reinforced area includes a unidirectional stretch geogrid, a reinforced soil layer, a geotextile wall and a strip foundation. The strip foundation is located below the geotextile wall. The geotextile wall includes a plurality of geobags stacked from bottom to top. The unidirectional stretch geogrid and the reinforced soil layer are alternately stacked. One end of the unidirectional stretch geogrid close to the geotextile wall is reversely covered with a geotextile bag.

2. The reinforced soil roadbed that is convenient for pipeline maintenance according to claim 1 is characterized in that: The unidirectional tensile geogrid below the pipeline excavation area is laid through the entire reinforced area.

3. The reinforced soil roadbed that is convenient for pipeline maintenance according to claim 1 is characterized in that: The number of the geocells is multiple, and the multiple geocells are divided into multiple groups, and the multiple groups of geocells are symmetrically distributed on both sides.

4. The reinforced soil roadbed that is convenient for pipeline maintenance according to claim 3 is characterized in that: From bottom to top, multiple geocells in each group of geocells are stacked, and the distance from the center line of the pipeline excavation area gradually increases, forming a stepped shape.

5. The reinforced soil roadbed that is convenient for pipeline maintenance according to claim 1 is characterized in that: The shape of the pipeline excavation area is an inverted trapezoid.

6. The reinforced soil roadbed for pipeline maintenance according to claim 1, characterized in that: In the horizontal direction, the unidirectional tensile geogrids with corresponding positions pass through the gap between two adjacent geocells and are hung on the connecting anchor rods and short rods.

7. The reinforced soil roadbed for pipeline maintenance according to claim 1, characterized in that: A plurality of connecting anchor rods and a plurality of short rods are arranged along the length direction of the connecting plate.

8. The reinforced soil roadbed for pipeline maintenance according to claim 1, characterized in that: It also includes cell soil, the connection plate is in a mesh shape, and the cell soil is filled into the mesh holes of the connection plate and the cells of the geocell.

9. The reinforced soil roadbed for pipeline maintenance according to claim 1, characterized in that: The wall of the geocell is provided with a plurality of drainage holes.

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