Structure for treating road and square soft foundation based on high-strength geocell
By setting up a back slope and a multi-layer PET high-strength geometries on the soft soil roadbed, the problems of long construction cycle, serious environmental pollution and high cost in deep soft soil treatment are solved, and the rapid, environmentally friendly and economical roadbed reinforcement effect is achieved.
Patent Information
- Application Number
- CN202420927755.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-04-30
AI Technical Summary
When dealing with deep soft soil, the existing technology has a long construction cycle, serious environmental pollution and high cost, making it difficult to effectively solve the problems of deep sinking, landslides and instability of soft soil roadbeds.
A replacement layer consisting of PET high-strength geogrid chamber and soil cushion layer is adopted. By setting up a back slope, laying multiple PET high-strength geogrid chamber, soil cushion layer and sand and gravel cushion layer, a stable roadbed structure is formed to enhance the overall strength of the roadbed.
It realizes rapid treatment of deep soft soil, shortens the construction cycle, reduces environmental pollution and construction costs, and ensures the overall strength of the roadbed.
Smart Images
Figure CN222809806U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of road construction, in particular to a structure for treating soft foundations of roads and squares based on high-strength geocells. Background Art
[0002] Soft soil roadbed is a common type of roadbed in special areas. It is mostly distributed along rivers, ocean coasts, inland lakes, ponds, basins and rainy mountain depressions. Soft soil has the characteristics of high water content, poor permeability, low natural strength and high compressibility. Therefore, if roads, squares and other buildings are directly built on the soft soil roadbed, under the action of external loads, they will sink, collapse and become unstable due to the low strength of the soft soil roadbed, resulting in damage to the building and accidents.
[0003] At present, for soft foundations exceeding 3m in depth, granular piles are usually used to reinforce the roadbed. The above reinforcement structure takes a long construction period due to the granular piles, which affects the construction progress, causes environmental pollution, and also increases the reinforcement cost.
[0004] Therefore, a new reinforcement structure is needed to solve the above problems. Summary of the invention
[0005] The purpose of the utility model is to provide a structure for treating soft foundations of roads and squares based on high-strength geocells in accordance with the above-mentioned deficiencies of the prior art. By setting a replacement layer composed of PET high-strength geocells and a cushion soil layer, rapid treatment of deep soft soil can be achieved, shortening the construction period, reducing environmental pollution, and greatly saving construction costs.
[0006] The purpose of this utility model is achieved by the following technical solutions:
[0007] A structure for treating soft foundations of roads and squares based on high-strength geocells, which is arranged between a roadbed and a slope protection, and is characterized in that: reverse slopes are arranged on both sides of the roadbed in the width direction, at least one replacement layer consisting of PET high-strength geocells and a cushion layer is laid on the roadbed between the reverse slopes on both sides, a geogrid is laid above the replacement layer, a continuous sand and gravel cushion layer is laid above the geogrid, and the top of the continuous sand and gravel cushion layer is backfilled to form the slope protection.
[0008] Stress diffusion angles are provided on both sides of the cushion soil layer along the width direction, and the stress diffusion angles are the angles between the inclined surface of the cushion soil layer and the vertical direction.
[0009] Backfill soil is arranged between the cushion soil layer and the reverse slope.
[0010] The PET high-strength geocell extends into the backfill soil at both sides along the width direction.
[0011] The height of the cushion soil layer located at the top is level with the ground.
[0012] Both sides of the geogrid are reversed.
[0013] The cushion soil layer is formed by backfilling the PET high-strength geocell with medium-coarse sand and backfilling the top of the PET high-strength geocell with crushed stone soil.
[0014] The advantages of the utility model are: it can ensure the overall strength of the roadbed while eliminating the need for piling equipment and personnel, and the strength of the roadbed is enhanced by laying multiple layers of PET high-strength geocells during backfilling, so that deep soft soil can be processed quickly, shortening the construction period, reducing environmental pollution, and greatly saving construction costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a construction process step diagram of the utility model;
[0016] Figure 2 This is a schematic diagram of the structure of the utility model after the soft soil layer of a preset depth is excavated;
[0017] Figure 3 This is a schematic diagram of the structure of the utility model after the first high-strength geocell is laid;
[0018] Figure 4 This is a schematic diagram of the structure of the utility model after backfilling to form the first cushion soil layer;
[0019] Figure 5 This is a schematic diagram of the structure of the utility model after laying the second high-strength geocell;
[0020] Figure 6 This is a schematic diagram of the structure of the utility model after backfilling to form a second cushion soil layer;
[0021] Figure 7 This is a schematic diagram of the structure of the utility model after laying the sand and gravel cushion layer;
[0022] Figure 8 It is a structural schematic diagram of the utility model after construction is completed. DETAILED DESCRIPTION
[0023] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by technicians in the same industry:
[0024] like Figure 1-8As shown, the marks in the figure respectively represent: normal soil layer 1, reverse slope 2, first cushion soil layer 31, second cushion soil layer 32, continuous sand and gravel cushion layer 33, first PET high-strength geocell 41, second PET high-strength geocell 42, geogrid 43, slope protection 5, first temporary passage 61, and second temporary passage 62.
[0025] Example: Figures 1 to 8 As shown, the structure for treating the soft foundation of roads and squares based on PET high-strength geocells in this embodiment includes process 100. The structure for treating the soft foundation of roads and squares based on PET high-strength geocells in this embodiment includes the following construction steps:
[0026] Step 101, excavating a soft soil layer of a preset depth according to the overall depth of the soft soil layer, and leveling the exposed soft soil layer.
[0027] like Figure 2 As shown, in the width direction of the roadbed ( Figure 2 In the left and right directions shown in FIG. 1 , a reverse slope 2 can be set on both sides of the exposed soft soil layer. This can prevent the unexcavated soft soil layer from collapsing during the construction process, affecting the construction progress. In this embodiment, the slope ratio of the reverse slope 2 is 1:2.
[0028] In some embodiments, construction workers can use equipment such as excavators to remove soft soil. The excavation range is determined according to the purpose of the roadbed. For example, the preset range is determined based on whether the roadbed is used to build a road or a square.
[0029] When excavating soft soil, it is not necessary to excavate the entire soft soil layer, but only the soft soil layer of the preset depth needs to be excavated. The structure of this embodiment is suitable for soft soil layers with a depth of less than 6m. When the overall depth of the soft soil layer is 6m, the preset depth can be 3m, and the distance between the exposed soft soil layer and the normal soil layer 1 is 3m. When the overall depth of the soft soil layer is less than 6m, the preset depth is controlled first, and the distance between the exposed soft soil layer and the normal soil layer 1 can be reduced accordingly.
[0030] Step 102, determining the number of layers of PET high-strength geocells to be laid in the exposed soft soil layer according to a preset depth.
[0031] like Figure 3 As shown, the first PET high-strength geocell 41 is stretched into a mesh and laid on the above-mentioned exposed soft soil layer. Next, medium-coarse sand is backfilled into the first PET high-strength geocell 41 to form a structure with strong lateral restriction and high rigidity, thereby effectively enhancing the bearing capacity, anti-deformation ability and load dispersion of the roadbed.
[0032] In some embodiments, due to different geological conditions, when the thickness of the soft foundation exceeds 6m, the laying interval of adjacent PET high-strength geocells can also be determined according to the parameters of the PET high-strength geocells, for example, 1m apart. The laying interval of the PET high-strength geocells can be reduced according to the distance between the exposed soft soil layer and the normal soil layer, and then the number of layers of the PET high-strength geocells can be determined according to the preset depth.
[0033] This embodiment is described by taking a two-layer PET high-strength geocell as an example.
[0034] Step 103, laying PET high-strength geocells layer by layer on the exposed soft soil layer, backfilling the PET high-strength geocells with medium-coarse sand, and backfilling the corresponding PET high-strength geocells with crushed stone soil to form a cushion soil layer.
[0035] In some cases, in addition to backfilling with medium-coarse sand, other methods such as crushed stone, concrete, etc. can also be used for backfilling. The first PET high-strength geocell 41 can be a PET high-strength geocell.
[0036] The PET high-strength geocell has the characteristics of high tensile strength, low elongation and strong rigidity. The supporting force of the connecting strips and pins of the PET high-strength geocell can further improve the overall strength of the PET high-strength geocell.
[0037] After backfilling with medium-coarse sand, due to the three-dimensional mesh cell structure of the PET high-strength geocell, the hoop compaction of the medium-coarse sand improves the mechanical properties of the PET high-strength geocell, which can avoid horizontal displacement of the roadbed and disperse the upper filling load. The hoop force and lateral tension provided by the PET high-strength geocell are much greater than those of conventional geocells.
[0038] like Figure 4 As shown, gravel soil is backfilled above the first PET high-strength geocell 41, and one or two first temporary passages 61 are first set according to the width of the roadbed. When the roadbed is used to build a road, the width of the roadbed is relatively narrow. Figure 4 The width direction of the first PET high-strength geocell 41 shown in FIG. Figure 4 A first temporary passage 61 is set on one side of the roadbed (left and right directions as shown). When the roadbed is used to build a square, the roadbed is relatively wide, and the first temporary passage 61 can be set on both sides of the first PET high-strength geocell 41. The first temporary passage 61 can be formed by strengthening the soil layer by tamping the soil layer. The width of the first temporary passage 61 can be set according to the width of the transport vehicle, for example, 2.5m.
[0039] The transport vehicle can pass through the first temporary passage 61 and unload the crushed stone soil, and then backfill to form the first cushion soil layer 31. The crushed stone soil can also be replaced by lime soil, plain soil, crushed stone, etc.
[0040] The first cushion layer 31 may be provided with a stress diffusion angle θ on both sides along the width direction. The stress diffusion angle θ may be the angle between the inclined surface of the first cushion layer 31 and the vertical direction. It should be noted that the magnitude of the stress diffusion angle θ is related to the cushion material of the first cushion layer 31.
[0041] When the cushion material of the first cushion layer 31 is selected from one of medium sand, coarse sand, gravel sand, round gravel, angular gravel, pebbles, and crushed stone, the above stress diffusion angle θ can be 20°. When the backfill material of the first cushion layer 31 is selected from plain soil, the above stress diffusion angle θ can be 6°. When the cushion material of the first cushion layer 31 is selected from lime soil, the above stress diffusion angle θ can be 28°. In actual construction, the size of the stress diffusion angle can be determined according to the cushion material of the first cushion layer 31 based on repeated experiments or actual conditions.
[0042] like Figure 5 As shown, after the first cushion soil layer 31 is formed, both ends of the first PET high-strength geocell 41 pass through the first cushion soil layer 31. After the qualified soil is backfilled between the first cushion soil layer 31 and the reverse slope 2, the first PET high-strength geocell 41 can further enhance the strength between the first cushion soil layer 31 and the reverse slope 2, thereby improving the bearing capacity of the roadbed as a whole.
[0043] like Figure 5 As shown, the second PET high-strength geocell 42 is stretched into a mesh and laid on the first cushion soil layer 31. Next, medium-coarse sand is backfilled into the second PET high-strength geocell 42. Similarly, the second PET high-strength geocell 42 can also use a PET high-strength geocell. Those skilled in the art can determine the material for backfilling the second PET high-strength geocell 42 according to actual conditions.
[0044] like Figure 6 As shown, gravel soil is backfilled above the second PET high-strength geocell 42, and one or two second temporary passages 62 can be set according to the width of the roadbed. Similarly, the second temporary passage 62 can be formed by reinforcing the soil layer by tamping.
[0045] Next, the transport vehicle can pass through the second temporary passage 62 and unload the gravel soil, and then backfill to form the second cushion soil layer 32. Similarly, the same stress diffusion angle θ is also set on both sides of the second cushion soil layer 32.
[0046] like Figure 7As shown, after the second cushion soil layer 32 is formed, both ends of the second PET high-strength geocell 42 pass through the second cushion soil layer 32. After backfilling qualified soil between the second cushion soil layer 32 and the reverse slope 2, the second PET high-strength geocell 42 can further enhance the strength between the second cushion soil layer 32 and the reverse slope 2, thereby improving the overall bearing capacity of the roadbed.
[0047] The height of the second cushion soil layer 32 can be level with the ground.
[0048] Step 104: Lay the sand and gravel cushion layer 33 on the top cushion soil layer, and set the geogrid 43 for further reinforcement, wherein the two sides of the geogrid 43 are reversed, and the reversed length is not less than 2m, so as to further enhance the reinforcement performance of the geogrid 43.
[0049] Step 105, backfilling above the sand and gravel cushion layer to form a slope protection.
[0050] like Figure 8 As shown, qualified soil or the like can be backfilled above the sand and gravel cushion layer 33 to form a slope protection 5, and the slope ratio of the slope protection can be 1:1.5.
[0051] The present invention sets reverse slopes 2 on both sides of the exposed soft soil layer, thereby preventing the unexcavated soft soil layer from collapsing during the construction process and affecting the construction progress. Furthermore, by laying PET high-strength geocells with high tensile strength, low elongation and strong rigidity, the horizontal displacement of the roadbed can be avoided and the upper filling load can be dispersed after backfilling with medium and coarse sand.
[0052] In addition, the cushion layer further improves the bearing capacity and stability of the cushion layer by setting the stress diffusion angle. Finally, the PET high-strength geocells pass through the cushion layer accordingly. At the same time, backfill is performed between the reverse slope and the cushion layer, so that the PET high-strength geocells can enhance the stability of both sides of the cushion layer and the connection strength with the roadbed, further improving the overall bearing capacity and stability of the roadbed.
[0053] By setting up two or more layers of PET high-strength geocells, the strength of the roadbed can be guaranteed while shortening the construction period and saving construction costs.
[0054] Although the above embodiments have described the concepts and embodiments of the purpose of the utility model in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the utility model without departing from the scope of the claims, so they are not described one by one here.
Claims
1. A structure for treating soft foundation of roads and squares based on high-strength geocells, arranged between the roadbed and the slope protection, characterized in that: The roadbed is provided with reverse slopes on both sides along the width direction, and at least one replacement layer consisting of PET high-strength geocells and a cushion soil layer is laid on the roadbed between the reverse slopes on both sides, a geogrid is laid above the replacement layer, a sand and gravel cushion layer is laid above the geogrid, and the top of the sand and gravel cushion layer is backfilled to form the slope protection.
2. According to claim 1, a structure for treating soft foundation of roads and squares based on high-strength geocells is characterized by: Stress diffusion angles are provided on both sides of the cushion soil layer along the width direction, and the stress diffusion angles are the angles between the inclined surface of the cushion soil layer and the vertical direction.
3. The structure for treating soft foundation of roads and squares based on high-strength geocells according to claim 1 is characterized in that: Backfill soil is arranged between the cushion soil layer and the reverse slope.
4. The structure for treating soft foundation of roads and squares based on high-strength geocells according to claim 3 is characterized by: The PET high-strength geocell extends into the backfill soil at both sides along the width direction.
5. The structure for treating soft foundation of roads and squares based on high-strength geocells according to claim 1 is characterized in that: The height of the cushion soil layer located at the top is level with the ground.
6. The structure for treating soft foundation of roads and squares based on high-strength geocells according to claim 1 is characterized in that: The two sides of the geogrid are reversed.
7. The structure for treating soft foundation of roads and squares based on high-strength geocells according to claim 1 is characterized in that: The cushion soil layer is formed by backfilling the PET high-strength geocell with medium-coarse sand and backfilling the top of the PET high-strength geocell with crushed stone soil.