Red clay filling structure
By adopting the interlayer structure of limestone gravel roadbed and composite filling layer in the red clay filling structure, the problems of settlement deformation and resource waste of red clay roadbed are solved, and the red clay filling effect with short construction period, environmentally friendly and low-cost is achieved.
Patent Information
- Application Number
- CN202421548814.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-02
AI Technical Summary
As a roadbed filling material, red clay has the problems of large settlement deformation and long deformation stability time. The existing improved treatment methods have a long construction period, large area, unenvironmental and high cost, which leads to frequent abandonment of red clay, resulting in waste of resources and environmental pollution.
A red clay fill structure is adopted where limestone slag roadbed, composite filling layer and limestone slag replacement filling layer is laid from top to bottom. The composite filling layer includes red clay layer and limestone slag layer laid, and geonon-woven fabric is laid on the limestone slag layer, and anti-seepage geotextile is laid on the lower surface to form an interlayer structure to promote the drainage and consolidation of the red clay layer.
It has achieved a red clay fill structure with short construction period, environmental protection and low cost. It can directly use red clay without physical and chemical treatment as roadbed filler to reduce abandonment, reduce roadbed settlement deformation, and prevent roadbed cracking. It has high economic value and technological innovation significance.
Smart Images
Figure CN222771239U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of roadbed filling and relates to a red clay filling structure. Background Art
[0002] Red clay refers to carbonate rocks such as limestone. Under subtropical warm and humid climate conditions, the residual, slope or residual-slope deposits are weathered into brown-red, brown-red or yellow-brown high-plastic clay. It is a secondary product of limestone weathering. It is widely distributed in Guizhou, Yunnan and Guangxi in my country. The characteristics of red clay are high natural water content, high liquid limit and poor compactability. If it is used as a roadbed filling material, the settlement deformation of the roadbed will be large and the deformation stability time will be long. According to the "Highway Roadbed Design Code", red clay and high liquid limit soil should not be used directly as roadbed filling. Red clay and high liquid limit soil treated by physical measures can be used as embankment filling under the roadbed, and the height of the embankment should not be greater than 10m. The physical measures recommended by the code are mainly to improve and treat red clay by sun drying and adding inorganic binders such as quicklime or cement. The above treatment methods have problems such as long construction period, large area occupied, environmental pollution and high cost. Therefore, in actual projects, red clay is often treated as waste. Excessive accumulation of waste will cause waste of resources, environmental pollution, etc., and the treatment of waste will increase additional management costs.
[0003] Therefore, it is necessary to propose a method for efficiently and low-costly treating red clay waste to avoid the above problems. Utility Model Content
[0004] In view of this, the purpose of the utility model is to provide a red clay filling structure, which effectively utilizes waste red clay in a low-cost manner.
[0005] In order to achieve the above object, the utility model provides the following technical solutions:
[0006] A red clay filling structure, comprising a limestone slag roadbed, a composite filling layer and a limestone slag replacement layer, which are laid in a trapezoidal shape from top to bottom;
[0007] The composite filling layer comprises a red clay layer and a limestone slag layer which are laid alternately, the upper surface of the limestone slag layer is laid with a geotextile nonwoven fabric, and the lower surface thereof is laid with an anti-seepage geotextile;
[0008] A drainage pipe is also laid on the top surface of the limestone slag roadbed to discharge the accumulated water on the top surface along the side of the fill structure.
[0009] Optionally, it also includes a limestone slag edging layer obliquely arranged on the side of the fill structure, the upper part of the limestone slag edging layer is flush with the top surface of the limestone slag roadbed, and the lower part is connected to the limestone slag replacement layer.
[0010] Optionally, the geotextile nonwoven fabric is arranged on the inner side of the limestone slag edging layer.
[0011] Optionally, both ends of the drain pipe are connected to the outer surface of the limestone slag edging layer.
[0012] Optionally, the slope of the limestone slag edging layer is set to 1:1.5.
[0013] Optionally, it also includes a drainage ditch arranged at the bottom of the side waist of the fill structure, and the drainage pipe is arranged at the lower part of the limestone slag edge layer, which is connected with the drainage ditch through the drainage pipe.
[0014] Optionally, the uppermost layer and the lowermost layer of the composite filling layer are both red clay layers, wherein the anti-seepage geotextile is arranged between the lowermost red clay layer and the limestone slag replacement layer.
[0015] Optionally, the thickness of the limestone slag roadbed is set to 190-210 mm.
[0016] Optionally, the thickness of the red clay layer is less than or equal to 60 mm.
[0017] Optionally, the thickness of the limestone slag layer is less than or equal to 30 mm.
[0018] The beneficial effects of the utility model are:
[0019] The filling structure of the utility model is an improved treatment method such as sun drying, external addition of quicklime or cement and other inorganic binders recommended by the norms, and has the advantages of short construction period, environmental protection and low cost. Red clay that has not been physically and chemically treated can be directly used as roadbed filler. It has a wide range of applications, especially for limestone areas (karst landform areas), can effectively reduce the abandonment of red clay, overcomes the technical difficulties in this field, has high economic value, and is also conducive to the technical innovation of roadbed structure in this field.
[0020] By utilizing the high permeability of limestone slag, the limestone slag layer forms a blind ditch permeable layer to remove the pore water in the red clay layer, thereby accelerating the drainage and consolidation process of the roadbed. The geotextile can prevent the red clay layer from bringing out fine particles during the drainage process, causing the roadbed to sink and block the drainage channel of the limestone slag layer. The anti-seepage geotextile set at the bottom of the limestone slag layer can prevent the water in the upper layer from penetrating into the lower roadbed. On the one hand, this interlayer structure can accelerate the discharge of pore water inside the red clay layer and reduce the water content of the red clay layer. On the other hand, since the stiffness of the limestone slag layer is much greater than that of the red clay layer, the red clay layer can be embedded between the limestone slag layers, effectively controlling the settlement and deformation of the roadbed and preventing road cracking.
[0021] After testing, it was found that the deflection value of the fill structure of the utility model met the requirements of the specifications, and during the operation period, there was no settlement of the high slope roadbed and no pavement cracking. The application effect was good and it has good market application prospects.
[0022] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:
[0024] Figure 1 It is a schematic diagram of the filling structure of the utility model;
[0025] Figure 2 for Figure 1 A magnified schematic diagram of part A;
[0026] Figure 3 It is a construction step diagram of the utility model;
[0027] Figure 4 It is the rebound deflection detection result of the roadbed fill structure of the utility model.
[0028] Reference numerals:
[0029] 1 ground, 2 limestone slag replacement layer, 3 anti-seepage geotextile, 4 red clay layer, 5 limestone slag layer, 6 geotextile non-woven fabric, 7 limestone slag edging layer, 8 limestone slag roadbed, 9 drainage ditch, 10 drainage pipe. DETAILED DESCRIPTION
[0030] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The following embodiments and the features in the embodiments can be combined with each other without conflict.
[0031] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present utility model. In order to better illustrate the embodiments of the present utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.
[0032] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0033] See also Figure 1-2 , is a red clay filling structure, including a limestone slag roadbed 8, a composite filling layer and a limestone slag replacement layer 2, which are laid in a trapezoidal shape from top to bottom; the composite filling layer includes a red clay layer 4 and a limestone slag layer 5, which are laid in layers, and a geotextile nonwoven fabric 6 is laid on the upper surface of the limestone slag layer 5, and an anti-seepage geotextile 3 is laid on the lower surface. The geotextile nonwoven fabric 6 can prevent the fine particles in the red clay layer 4 from flowing into the limestone slag layer 5 with the pore water and blocking the pores in the limestone slag layer 5, thereby reducing the drainage effect of the limestone slag layer 5; the anti-seepage geotextile 3 can prevent water from flowing into the lower red clay layer 4 under the action of gravity. A drainage pipe 10 is also laid on the top surface of the limestone slag roadbed 8, which is used to discharge the accumulated water on the top surface along the side waist of the filling structure.
[0034] The uppermost and lowermost layers of the composite filling layer are both red clay layers 4 , wherein an impermeable geotextile 3 is arranged between the lowermost red clay layer 4 and the limestone slag replacement layer 2 .
[0035] The thickness of the limestone slag roadbed 8 is set to 190-210 mm. In some embodiments of the present invention, the thickness of the limestone slag roadbed 8 is preferably 200 mm; the thickness of the red clay layer 4 is less than or equal to 60 mm, and the thickness of the limestone slag layer 5 is less than or equal to 30 mm.
[0036] The filling structure also includes a limestone slag edge layer 7 obliquely arranged on the side of the filling structure, the upper part of the limestone slag edge layer 7 is flush with the top surface of the limestone slag roadbed 8, and the lower part is connected to the limestone slag replacement layer 2. The slope of the limestone slag edge layer 7 is set to 1:1.5.
[0037] A geotextile nonwoven fabric 6 is arranged inside the limestone slag edging layer 7; the geotextile nonwoven fabric 6 restricts the fine particles in the red clay layer 4, and only allows the pore water in the red clay layer 4 to enter the limestone slag edging layer 7 from both sides of the red clay layer 4, and then utilizes the high permeability of the limestone slag edging layer 7 to guide the pore water to be discharged from the fill structure to the bottom drainage ditch 9.
[0038] The fill structure further includes a drainage ditch 9 arranged at the bottom of the side waist of the fill structure, and a drainage pipe 10 is arranged at the lower part of the limestone slag edge layer 7, which is connected to the drainage ditch 9 through the drainage pipe 10, so that the pore water in the limestone slag edge layer 7 can be discharged into the drainage ditch 9 through the drainage pipe 10. In some embodiments of the utility model, the drainage pipe 10 adopts a PVC drainage pipe 10.
[0039] like Figure 3 As shown, a construction method for constructing any of the above-mentioned red clay fill structures comprises the following steps:
[0040] S1, remove the topsoil on the existing ground 1 and replace it with a 50cm thick limestone slag replacement layer 2;
[0041] S2, laying an impermeable geotextile 3 on the upper surface of the limestone slag replacement layer 2 to prevent underground capillary water from being siphoned into the fill structure;
[0042] S3, a 60 cm thick red clay layer 4 and a 30 cm thick limestone slag layer 5 are alternately laid on the anti-seepage geotextile 3, wherein the upper surface of the limestone slag layer 5 is laid with a geotextile nonwoven fabric 6, and the lower surface thereof is laid with the anti-seepage geotextile 3; the red clay layer 4 is composed of natural red clay;
[0043] S4, laying a limestone slag roadbed 8 above the uppermost red clay layer 4;
[0044] S5, using geotextile nonwoven fabric 6 and 30 cm thick limestone slag edging layer 7 to edging the side of the fill structure in sequence, and connecting the bottom of the limestone slag edging layer 7 to the drainage ditch 9 at the bottom of the slope.
[0045] By utilizing the high permeability of limestone slag, the limestone slag layer 5 forms a blind ditch permeable layer to remove the pore water in the red clay layer 4, thereby accelerating the drainage and consolidation process of the roadbed, and the geotextile nonwoven fabric 6 can prevent the red clay layer 4 from bringing out fine particles during the drainage process, causing the roadbed to sink and block the drainage channel of the limestone slag layer 5. The anti-seepage geotextile 3 set at the bottom of the limestone slag layer 5 can prevent the water in the upper layer from penetrating into the lower roadbed. On the one hand, this interlayer structure can accelerate the discharge of pore water inside the red clay layer 4 and reduce the water content of the red clay layer 4. On the other hand, since the stiffness of the limestone slag layer 5 is much greater than that of the red clay layer 4, the red clay layer 4 can be embedded between the limestone slag layers 5, effectively controlling the settlement and deformation of the roadbed and preventing road cracking.
[0046] Example 1
[0047] In the process of completing the construction of the red clay filling structure using the above-mentioned construction method, when the height of the filling roadbed is less than 2m from the top surface of the roadbed, the roadbed adopts 8 layers of limestone slag roadbed, and the pavement structure is paved on the 8 layers of limestone slag roadbed. During construction, high-power bulldozers and heavy-duty vibrating compaction equipment should be used. The net weight of the roller is required to be no less than 16T, and the power of the bulldozer is required to be no less than 200kw; during rolling, the roller rolling speed is 2-4km / h, the frequency is about 25-30Hz, and during rolling, the roller is first used for static compaction, and then high-power vibration rolling is selected for about 6-8 times. During rolling, the wheel is required to be staggered by 1 / 3 of the wheel width each time.
[0048] When filling, the content of fine-grained limestone slag or stone chips should account for more than 15% of the large-grained material, and the maximum particle size should not be greater than 20cm; the liquid limit of red clay is less than 50%, and the compression coefficient is less than 0.5MPa -1 .
[0049] The utility model is a better treatment method than the standard recommended methods such as drying, adding quicklime or cement and other inorganic binders, which has the advantages of short construction period, environmental protection and low cost. It can directly use red clay without physical and chemical treatment as roadbed filler, and has a wide range of applications, especially for limestone areas (karst landform areas). It can effectively reduce the abandonment of red clay, has high economic value, and is also conducive to the technical innovation of roadbed structure in this field. After testing, the deflection value of the fill roadbed completed by the present invention meets the requirements of the standard (see the attached test data for details). Figure 4 As shown, the test data meets the requirements of the design deflection calculation formula for the top layer of the pavement in the "Highway Asphalt Pavement Design Specification" JTJ 014-97), and there is no settlement of the high slope roadbed and no pavement cracking during the operation period. The application effect is good and it has good market application prospects.
[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.
Claims
1. A red clay filling structure, characterized in that: It comprises a limestone slag roadbed (8), a composite filling layer and a limestone slag replacement layer (2) which are laid in sequence from top to bottom in a trapezoidal shape; The composite filling layer comprises a red clay layer (4) and a limestone slag layer (5) which are laid alternately, the upper surface of the limestone slag layer (5) is laid with a geotextile nonwoven fabric (6), and the lower surface thereof is laid with an anti-seepage geotextile (3); The top surface of the limestone slag roadbed (8) is also provided with a drainage pipe (10) for discharging the accumulated water on the top surface along the side of the fill structure.
2. The red clay filling structure according to claim 1, characterized in that: It also includes a limestone slag edge layer (7) obliquely arranged on the side of the fill structure, the upper part of the limestone slag edge layer (7) is flush with the top surface of the limestone slag roadbed (8), and the lower part is connected to the limestone slag replacement layer (2).
3. The red clay filling structure according to claim 2, characterized in that: The geotextile nonwoven fabric (6) is arranged inside the limestone slag edging layer (7).
4. The red clay filling structure according to claim 2, characterized in that: Both ends of the drainage pipe (10) are connected to the outer surface of the limestone slag edging layer (7).
5. The red clay filling structure according to claim 2, characterized in that: The slope of the limestone slag edge layer (7) is set to 1:1.
5.
6. The red clay filling structure according to claim 2, characterized in that: It also includes a drainage ditch (9) arranged at the bottom of the side waist of the fill structure, and the drainage pipe (10) is arranged at the lower part of the limestone slag edge layer (7) and is connected to the drainage ditch (9) through the drainage pipe (10).
7. The red clay filling structure according to claim 1, characterized in that: The uppermost and lowermost layers of the composite filling layer are both red clay layers (4), wherein the anti-seepage geotextile (3) is arranged between the lowermost red clay layer (4) and the limestone slag replacement layer (2).
8. The red clay filling structure according to claim 1, characterized in that: The thickness of the limestone slag roadbed (8) is set to 190-210 mm.
9. The red clay filling structure according to claim 1, characterized in that: The thickness of the red clay layer (4) is less than or equal to 60 mm.
10. The red clay filling structure according to claim 1, characterized in that: The thickness of the limestone slag layer (5) is less than or equal to 30 mm.