Construction of high liquid limit soil embankment in hot and humid area

Abstract

The utility model discloses a high liquid limit soil embankment layered deformation control filling structure in hot and humid areas belongs to building construction technical field, high liquid limit soil embankment layered deformation control filling structure in hot and humid areas, including foundation and the embankment main body filled on the foundation, the embankment main body includes lower embankment and upper embankment, the lower embankment includes the stone mat layer laid and compacted on the foundation, the macadam mat layer laid and compacted on the stone mat layer and the improved high liquid limit soil mat layer laid and compacted on the macadam mat layer, the upper embankment includes the coarse gravel layer laid and compacted on the improved high liquid limit soil mat layer, the fine gravel layer laid and compacted on the coarse gravel layer and the pavement structure layer laid on the fine gravel layer, it can be good to reduce and control the settlement of high liquid limit soil embankment.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and more specifically, to a filling structure for controlling the layered deformation of embankments in humid and hot regions with high liquid limit soil. Background Technology

[0002] An embankment is a railway structure constructed on natural ground using soil or stone, with a certain degree of compaction. The selection of subgrade fill material and the control of its compaction are crucial aspects of subgrade design and construction. Embankment settlement occurs under its own weight and train loads, resulting in compaction settlement. Furthermore, long-term repeated action of train dynamic loads leads to cumulative settlement. Excessive subgrade settlement causes subgrade defects, increases track maintenance workload, and affects normal traffic flow. Therefore, minimizing and controlling embankment settlement is a critical issue that subgrade engineering must address.

[0003] In the construction of existing embankments with high liquid limit soils in hot and humid regions, the selection of embankment structure and subgrade fill material and the control of compaction are of utmost importance in subgrade design and construction. High liquid limit soils are fine-grained soils with a liquid limit greater than 50%, characterized by high water content, high plastic limit, and difficulty in compaction. They are commonly found in the hot and humid climate zone of southern China and are prone to causing subgrade diseases in engineering projects. In order to reduce and control the settlement of embankments with high liquid limit soils, we propose a layered deformation control filling structure for embankments with high liquid limit soils in hot and humid regions to solve the above-mentioned problems. Utility Model Content

[0004] 1. Technical problems to be solved

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a filling structure for layered deformation control of embankments with high liquid limit soil in hot and humid areas, which can effectively reduce and control the settlement of embankments with high liquid limit soil.

[0006] 2. Technical Solution

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A layered deformation control embankment structure for high liquid limit soil in humid and hot regions, comprising a foundation and an embankment body filled on the foundation, wherein the embankment body comprises a lower embankment and an upper embankment;

[0009] The lower embankment includes a stone cushion layer laid and compacted on the foundation, a crushed stone cushion layer laid and compacted on the stone cushion layer, and a modified high liquid limit soil cushion layer laid and compacted on the crushed stone cushion layer.

[0010] The upper embankment includes a coarse gravel layer laid and compacted on the improved high liquid limit soil cushion layer, a fine gravel layer laid and compacted on the coarse gravel layer, and a pavement structure layer laid on the fine gravel layer.

[0011] The road structure layer includes a cement-stabilized subbase laid and compacted on the fine gravel layer, and a fine-grained asphalt surface layer laid and compacted on the cement-stabilized subbase.

[0012] Furthermore, both sides of the embankment are covered with a three-dimensional grid grass protection layer, and green plants are planted on the three-dimensional grid grass protection layer.

[0013] Furthermore, a drainage ditch is provided at the base of the foundation near the root of the embankment main slope, and the inner wall of the drainage ditch is constructed with rubble.

[0014] Furthermore, the improved high liquid limit soil cushion layer is constructed using a horizontal layered filling method with multiple layers of composite compaction.

[0015] Furthermore, the drainage slope of the road structure layer is designed to be between 2% and 5%.

[0016] Furthermore, the height of the main body of the embankment is set at 1.3-1.5m.

[0017] Furthermore, the slope ratio of the main body of the embankment is designed to be in the range of 1:1.5 to 1:1.75.

[0018] 3. Beneficial Effects

[0019] Compared with existing technologies, the advantages of this utility model are:

[0020] (1) In this scheme, the stone cushion layer combined with the crushed stone cushion layer can improve the bearing capacity of the foundation in the short term by increasing the contact area and friction. At the same time, the interlocking effect of the stone cushion layer combined with the crushed stone cushion layer can enhance the overall stability and prevent the roadbed from sliding. The improved high liquid limit soil cushion layer is treated by adding lime or cement to change the plasticity index of the soil and reduce the water content. By adopting layered filling and reasonable compaction, the strength and stability of the embankment body can be ensured, and the settlement of the high liquid limit soil embankment can be effectively reduced and controlled.

[0021] (2) In this scheme, the coarse gravel layer is located at the bottom of the upper embankment, mainly responsible for distributing the load, drainage, and enhancing overall stability. The fine gravel layer serves as the intermediate layer of the upper embankment, further distributing the load and regulating the soil moisture, thereby improving the bearing capacity. The base course of the pavement structure layer is a cement-stabilized subbase, which bears the vertical, horizontal, and impact forces of vehicles and transfers the load to the subbase, improving humidity and temperature conditions and reducing the impact of soil deformation on the pavement. The surface course is a fine-grained asphalt surface course that directly contacts vehicles and must be wear-resistant, skid-resistant, and smooth. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a structural schematic diagram of the present invention from another perspective;

[0024] Figure 3 This is a side view of the main body of the embankment of this utility model;

[0025] Figure 4 This is a cross-sectional schematic diagram of the AA part of the embankment of this utility model.

[0026] Explanation of the labels in the diagram:

[0027] 1. Foundation; 2. Embankment; 3. Stone cushion layer; 4. Crushed stone cushion layer; 5. Improved high liquid limit soil cushion layer; 6. Coarse gravel layer; 7. Fine gravel layer; 8. Pavement structure layer; 9. Cement stabilized cushion layer; 10. Fine-grained asphalt surface layer; 11. Three-dimensional grid grass protection layer; 12. Drainage ditch. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0029] Example:

[0030] Please see Figure 1-4 A layered deformation control filling structure for embankments with high liquid limit soil in hot and humid regions, comprising a foundation 1 and an embankment body 2 filled on the foundation 1, the embankment body 2 comprising a lower embankment and an upper embankment;

[0031] The lower embankment includes a stone cushion layer 3 laid and compacted on the foundation 1, a crushed stone cushion layer 4 laid and compacted on the stone cushion layer 3, and a modified high liquid limit soil cushion layer 5 laid and compacted on the crushed stone cushion layer 4.

[0032] The upper embankment includes a coarse gravel layer 6 laid and compacted on a modified high liquid limit soil cushion layer 5, a fine gravel layer 7 laid and compacted on the coarse gravel layer 6, and a pavement structure layer 8 laid on the fine gravel layer 7.

[0033] The road structure layer 8 includes a cement-stabilized subbase 9 laid and compacted on a fine gravel layer 7 and a fine-grained asphalt surface layer 10 laid and compacted on the cement-stabilized subbase 9.

[0034] It should be noted that the function of the lower embankment of the main embankment 2, through the combination of the stone cushion layer 3 and the crushed stone cushion layer 4, is mainly reflected in the following aspects:

[0035] Load dispersion and stress adjustment; the crushed stone cushion layer 4 can effectively disperse the embankment load through the mechanical properties of graded crushed stone, and uniformly transfer concentrated stress to the lower soil layer, avoiding local stress concentration that could lead to settlement or damage to the foundation 1.

[0036] Accelerated consolidation and drainage: The crushed stone cushion layer 4 has good permeability, which can accelerate the drainage and consolidation of the foundation 1, reduce the pore water pressure of the weak soil layer, and shorten the settlement cycle of the foundation 1.

[0037] To improve bearing capacity and stability, the stone cushion layer 3, together with the crushed stone cushion layer 4, can increase the bearing capacity of the foundation 1 in the short term by increasing the contact area and friction. At the same time, the interlocking effect of the stone cushion layer 3 and the crushed stone cushion layer 4 can enhance the overall stability and prevent the foundation 1 from sliding.

[0038] Extended service life: The crushed stone cushion layer 4 can isolate the foundation 1 from direct contact with water, reduce the erosion of the roadbed by environmental factors such as salt, freeze-thaw and so on, and extend the service life of the road.

[0039] The improved high liquid limit soil cushion layer 5 is treated by adding lime or cement to change the plasticity index of the soil and reduce its water content. The strength and stability of the embankment body 1 are ensured by using layered filling and reasonable compaction.

[0040] The upper embankment of the main embankment 2 works in conjunction with the coarse gravel layer 6, the fine gravel layer 7, the pavement structure layer 8, the cement-stabilized subbase layer 9, and the fine-grained asphalt surface layer 10 as follows:

[0041] Functional division of structural layer

[0042] Coarse gravel layer 6: Located at the bottom of the upper embankment, it mainly bears the load distribution, drainage and enhances the overall stability. It is usually made of crushed stone or gravel with good permeability.

[0043] Fine gravel layer 7: Usually used as an intermediate layer of the upper embankment to further distribute the load and regulate the soil moisture, thereby improving the bearing capacity.

[0044] The base course of pavement structure layer 8: A cement-stabilized subbase 9 is used to withstand the vertical, horizontal, and impact forces of vehicles, and to transfer the load to the subbase, improving humidity and temperature conditions and reducing the impact of subgrade deformation on the pavement. The surface course: A fine-grained asphalt surface course 10 is used, which is in direct contact with vehicles and needs to be wear-resistant, skid-resistant, and smooth; fine-grained asphalt mixtures are typically used.

[0045] It can effectively reduce and control the settlement of embankments with high liquid limit soil.

[0046] like Figure 1 As shown, both sides of the embankment 2 are covered with a three-dimensional grid grass protection layer 11, and green plants are planted on the three-dimensional grid grass protection layer 11.

[0047] It should be noted that this can effectively reduce soil erosion.

[0048] like Figure 1 As shown, a drainage ditch 12 is provided at the base of the foundation 1 near the slope root of the embankment 2, and the inner wall of the drainage ditch 12 is constructed with rubble.

[0049] It should be noted that the drainage ditch 12 is used to dredge the scouring water flow, preventing the embankment body 2 from being submerged and ensuring the load-bearing capacity of the embankment body 2.

[0050] The improved high liquid limit soil cushion layer 5 adopts a horizontal layered filling method with composite compaction and has multiple layers.

[0051] The drainage slope of pavement structure layer 8 is designed to be between 2% and 5%.

[0052] The height of the main embankment 2 is set at 1.3-1.5m.

[0053] The slope ratio of the main body of the embankment 2 is designed to be in the range of 1:1.5 to 1:1.75.

[0054] In use: The function of the lower embankment of the main embankment 2, through the combination of stone cushion layer 3 and crushed stone cushion layer 4, is mainly reflected in the following aspects:

[0055] Load dispersion and stress adjustment; the crushed stone cushion layer 4 can effectively disperse the embankment load through the mechanical properties of graded crushed stone, and uniformly transfer concentrated stress to the lower soil layer, avoiding local stress concentration that could lead to settlement or damage to the foundation 1.

[0056] Accelerated consolidation and drainage: The crushed stone cushion layer 4 has good permeability, which can accelerate the drainage and consolidation of the foundation 1, reduce the pore water pressure of the weak soil layer, and shorten the settlement cycle of the foundation 1.

[0057] To improve bearing capacity and stability, the stone cushion layer 3, together with the crushed stone cushion layer 4, can increase the bearing capacity of the foundation 1 in the short term by increasing the contact area and friction. At the same time, the interlocking effect of the stone cushion layer 3 and the crushed stone cushion layer 4 can enhance the overall stability and prevent the foundation 1 from sliding.

[0058] Extended service life: The crushed stone cushion layer 4 can isolate the foundation 1 from direct contact with water, reduce the erosion of the roadbed by environmental factors such as salt, freeze-thaw and so on, and extend the service life of the road.

[0059] The improved high liquid limit soil cushion layer 5 is treated by adding lime or cement to change the plasticity index of the soil and reduce its water content. The strength and stability of the embankment body 2 are ensured by using layered filling and reasonable compaction.

[0060] The upper embankment of the main embankment 2 works in conjunction with the coarse gravel layer 6, the fine gravel layer 7, the pavement structure layer 8, the cement-stabilized subbase layer 9, and the fine-grained asphalt surface layer 10 as follows:

[0061] Functional division of structural layer

[0062] Coarse gravel layer 6: Located at the bottom of the upper embankment, it mainly bears the load distribution, drainage and enhances the overall stability. It is usually made of crushed stone or gravel with good permeability.

[0063] Fine gravel layer 7: Usually used as an intermediate layer of the upper embankment, it further disperses the load and regulates the soil moisture, thereby improving the bearing capacity.

[0064] The base course of pavement structure layer 8: A cement-stabilized subbase 9 is used to withstand the vertical, horizontal, and impact forces of vehicles, and to transfer the load to the subbase, improve humidity and temperature conditions, and reduce the impact of subgrade deformation on the pavement. Surface course: A fine-grained asphalt surface course 10 is used that is in direct contact with vehicles and needs to be wear-resistant, skid-resistant, and smooth. Fine-grained asphalt mixtures are usually used.

[0065] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A embankment structure for layered deformation control of high liquid limit soil in hot and humid regions, comprising a foundation (1) and an embankment body (2) filled on the foundation (1), characterized in that: The main body of the embankment (2) includes a lower embankment and an upper embankment; The lower embankment includes a stone cushion layer (3) laid and compacted on the foundation (1), a crushed stone cushion layer (4) laid and compacted on the stone cushion layer (3), and a modified high liquid limit soil cushion layer (5) laid and compacted on the crushed stone cushion layer (4). The upper embankment includes a coarse gravel layer (6) laid and compacted on the improved high liquid limit soil cushion layer (5), a fine gravel layer (7) laid and compacted on the coarse gravel layer (6), and a pavement structure layer (8) laid on the fine gravel layer (7). The road structure layer (8) includes a cement-stabilized subbase (9) laid and compacted on the fine gravel layer (7) and a fine-grained asphalt surface layer (10) laid and compacted on the cement-stabilized subbase (9).

2. The embankment structure for layered deformation control of high liquid limit soil embankments in humid and hot regions according to claim 1, characterized in that: Both sides of the embankment body (2) are covered with a three-dimensional grid grass protection layer (11), and green plants are planted on the three-dimensional grid grass protection layer (11).

3. The embankment structure for layered deformation control of high liquid limit soil embankments in humid and hot regions according to claim 2, characterized in that: A drainage ditch (12) is provided at the base of the foundation (1) near the slope root of the embankment (2), and the inner wall of the drainage ditch (12) is constructed with rubble.

4. The embankment structure for layered deformation control of high liquid limit soil embankments in humid and hot regions according to claim 1, characterized in that: The improved high liquid limit soil cushion layer (5) is constructed using a horizontal layered filling method with multiple layers of composite compaction.

5. The embankment structure for layered deformation control of high liquid limit soil embankments in humid and hot regions according to claim 1, characterized in that: The drainage slope of the road structure layer (8) is designed to be between 2% and 5%.

6. The embankment structure for layered deformation control of high liquid limit soil embankments in humid and hot regions according to claim 1, characterized in that: The height of the main body of the embankment (2) is set at 1.3-1.5m.

7. The embankment structure for layered deformation control of high liquid limit soil embankments in humid and hot regions according to claim 1, characterized in that: The slope ratio of the main body of the embankment (2) is designed to be in the range of 1:1.5 to 1:1.75.

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