Gradient type light soil anti-sedimentation roadbed structure
By adopting gradient design and hard shell reinforcement in light soil roadbeds, the problem of untargeted performance design of light soil under different working conditions is solved, and the effect of improving the strength and stability of the roadbed is achieved.
Patent Information
- Application Number
- CN202421439941.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-06-24
AI Technical Summary
The performance design of existing light soil under different working conditions is not targeted, resulting in problems such as floating, frivolous, and settlement, which need to be designed for different application scenarios.
The gradient light soil anti-segregation subgrade structure is adopted, including the upper and lower layers of low-volume and high-strength bubbles arranged from top to bottom. The wet volume of the two layers is different, and the hard shell layer with a certain load-bearing capacity is reinforced on the upper layer.
While ensuring that the overall load is controllable, the strength of the lightweight soil layer is improved, the bulk weight is reduced, the load on the hard shell layer is reduced, and the overall stability of the roadbed is improved.
Smart Images
Figure CN223047826U_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of highway construction, and particularly to a gradient light soil anti-settlement subgrade structure. Background Art
[0002] In recent years, aerated lightweight soil has been widely used in the fields of soft foundation treatment, subgrade expansion, steep subgrade, backfill of abutment, etc. In the application, the designed unit weight of the lightweight soil is generally between 450 - 700 kg / m³, and the designed strength is between 0.6 - 1.2 MPa. There is no targeted design for the performance of the lightweight soil under different working conditions, which leads to different types of problems such as floating, light flotation, and settlement during the application of the lightweight soil. Therefore, it is necessary to conduct targeted design on the aerated lightweight soil structure for different application scenarios. Summary of the Invention
[0003] The purpose of the present invention is to provide a gradient light soil anti-settlement subgrade structure, which improves the strength of the entire lightweight soil layer and reduces the unit weight of the entire lightweight soil layer while ensuring controllable overall load. Without reducing the strength, it not only reduces the load on the hard crust layer but also improves the overall stability of the subgrade.
[0004] The technical solution adopted by the present invention is as follows:
[0005] A gradient light soil anti-settlement subgrade structure includes a low unit weight and high strength aerated lightweight soil upper layer, a low unit weight and high strength aerated lightweight soil lower layer, and an in-situ solidified hard crust layer arranged in sequence from top to bottom; the wet unit weight of the low unit weight and high strength aerated lightweight soil lower layer is greater than that of the low unit weight and high strength aerated lightweight soil upper layer.
[0006] Preferably, the thickness of the low unit weight and high strength aerated lightweight soil upper layer 1 is 1 - 2 m.
[0007] Preferably, the wet unit weight of the low unit weight and high strength aerated lightweight soil upper layer (1) is 400 - 500 kg / m³.
[0008] Preferably, the thickness of the low unit weight and high strength aerated lightweight soil lower layer (2) is 2 - 3 m.
[0009] Preferably, the wet unit weight of the low unit weight and high strength aerated lightweight soil lower layer (2) is 450 - 550 kg / m³.
[0010] Preferably, the thickness of the in-situ solidified hard crust layer (3) is 0.5 - 1 m.
[0011] Preferably, the in-situ solidified hard crust layer (3) is a cementitious material solidified in-situ soil.
[0012] Preferably, the compressive strength of the in-situ solidified hard crust layer (3) is 0.5 - 1 MPa.
[0013] The beneficial effects of the present invention are as follows:
[0014] By in-situ solidifying the hard shell layer, the present invention forms a hard shell layer with a certain bearing capacity, avoiding the excavation of the soft soil subgrade. Through the gradient design of different unit weights for the upper and lower layers of lightweight soil, while ensuring that the overall load is controllable, the strength of the entire lightweight soil layer is improved. By selecting the foamed lightweight soil with different unit weights for the upper and lower layers, the unit weight of the entire lightweight soil layer is reduced. Without reducing the strength, the load on the hard shell layer is reduced, and at the same time, the overall stability of the subgrade is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the gradient-type lightweight soil anti-settlement subgrade structure in the embodiment of the present invention.
[0016] In the figure: 1 - upper layer of low-unit-weight high-strength foamed lightweight soil; 2 - lower layer of low-unit-weight high-strength foamed lightweight soil; 3 - in-situ solidified hard shell layer. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0018] In the description of the present invention, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. involved, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, and is 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 orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.
[0019] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0020] Embodiment 1
[0021] A gradient lightweight soil anti-settlement roadbed structure, as Figure 1 shown, includes a low bulk density and high strength aerated lightweight soil upper layer 1, a low bulk density and high strength aerated lightweight soil lower layer 2, and an in-situ solidified hard shell layer 3 arranged in sequence from top to bottom; the wet bulk density of the low bulk density and high strength aerated lightweight soil lower layer is greater than that of the low bulk density and high strength aerated lightweight soil upper layer.
[0022] Further, the thickness of the low bulk density and high strength aerated lightweight soil upper layer 1 is 1 - 2 m.
[0023] Further, the wet bulk density of the low bulk density and high strength aerated lightweight soil upper layer 1 is 400 - 500 kg / m³, and an organosilicon waterproof agent with a mass ratio of 2% of the cementitious material is added.
[0024] Further, the thickness of the low bulk density and high strength aerated lightweight soil lower layer 2 is 2 - 3 m.
[0025] Further, the wet bulk density of the low bulk density and high strength aerated lightweight soil lower layer 2 is 450 - 550 kg / m³, and an organosilicon waterproof agent with a mass ratio of 2% of the cementitious material is added.
[0026] Embodiment 2
[0027] On the basis of Embodiment 1, the in-situ solidified hard shell layer is further defined, and the performance of Embodiment 2 after the limitation is more excellent.
[0028] Further, the thickness of the in-situ solidified hard shell layer 3 is 0.5 - 1 m.
[0029] Further, the in-situ solidified hard shell layer 3 is cementitious material solidified in-situ soil, and the cementitious material used is 6 - 10% cement and 2 - 3% organic-inorganic composite curing agent.
[0030] Further, the compressive strength of the in-situ solidified hard shell layer 3 is 0.5 - 1 MPa.
[0031] In summary, a gradient lightweight soil anti-settlement subgrade structure: The soft soil subgrade is in-situ thinly solidified with high-dose cement and organic-inorganic solidifying agents to form a hard shell layer with a certain bearing capacity, avoiding the excavation of the soft soil subgrade; compared with the unit weight of 550 - 650 kg / m³ of conventional aerated lightweight soil, the unit weight of the aerated lightweight soil is reduced, but its strength remains the same as that of conventional lightweight soil, which not only reduces the load on the hard shell layer but also improves the overall stability of the subgrade; a gradient design with different unit weights of lightweight soil in the upper and lower layers is adopted, and the strength of the upper-layer lightweight soil is improved while ensuring that the overall load is controllable; silicone waterproofing agent is added to reduce the water absorption rate of the lightweight soil from more than 20% conventionally to less than 10%, alleviating the increase in the load on the hard shell layer caused by the water absorption of the lightweight soil; The soft soil subgrade is in-situ thinly solidified with high-dose cement and organic-inorganic solidifying agents to form a hard shell layer with a certain bearing capacity, avoiding the excavation of the soft soil subgrade; compared with the unit weight of 550 - 650 kg / m³ of single-layer aerated lightweight soil, the unit weight of the aerated lightweight soil is reduced, but its strength does not decrease, which not only reduces the load on the hard shell layer but also improves the overall stability of the subgrade; a gradient design with different unit weights of lightweight soil in the upper and lower layers is adopted, and the strength of the upper-layer lightweight soil is improved while ensuring that the overall load is controllable; aerated lightweight soil containing silicone waterproofing agent is selected, and its water absorption rate is reduced to less than 10%, alleviating the increase in the load on the hard shell layer caused by the water absorption of the lightweight soil.
[0032] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.
[0033] It should be understood that those of ordinary skill in the art can make improvements or transformations according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present invention.
Claims
1. A gradient lightweight soil anti-settlement roadbed structure, characterized by: The method comprises an upper layer (1) of low bulk density and high strength bubble mixed lightweight soil, a lower layer (2) of low bulk density and high strength bubble mixed lightweight soil, and an in-situ solidified hard shell layer (3) which are arranged in sequence from top to bottom; the wet bulk density of the lower layer of low bulk density and high strength bubble mixed lightweight soil is greater than the wet bulk density of the upper layer of low bulk density and high strength bubble mixed lightweight soil.
2. The gradient light soil anti-settlement roadbed structure according to claim 1, characterized in that: The thickness of the upper layer (1) of low bulk density and high strength air bubble mixed lightweight soil is 1-2 m.
3. The gradient light soil anti-settlement roadbed structure according to claim 1 or 2, characterized in that: The upper layer (1) of low bulk density and high strength air bubble mixed lightweight soil has a wet bulk density of 400-500 kg / m³.
4. The gradient light soil anti-settlement roadbed structure according to claim 1, characterized in that: The thickness of the lower layer (2) of low bulk density and high strength bubble mixed lightweight soil is 2-3m.
5. The gradient light soil anti-settlement roadbed structure according to claim 1 or 4, characterized in that: The low bulk density and high strength air bubble mixed lightweight soil lower layer (2) has a wet bulk density of 450-550 kg / m³.
6. The gradient light soil anti-settlement roadbed structure according to claim 1, characterized in that: The thickness of the in-situ cured hard shell layer (3) is 0.5-1 m.
7. The gradient light soil anti-settlement roadbed structure according to claim 1 or 6, characterized in that: The in-situ solidified hard shell layer (3) is a cementitious material that solidifies the in-situ soil.
8. The gradient light soil anti-settlement roadbed structure according to claim 7, characterized in that: The compressive strength of the in-situ cured hard shell layer (3) is 0.5-1 MPa.