Soft soil foundation reinforcing structure

Abstract

The utility model provides a soft soil foundation reinforcing structure. The soft soil foundation reinforcing structure comprises a soft soil foundation; the soft soil foundation is provided with latticed grooves, and the grooves are filled with backfill materials. A sand well is arranged at the joint of the grooves, and the depth of the sand well is larger than that of the grooves; and the sand wells and the grooves corresponding to the sand wells are filled with a soil stabilizer. According to the embodiment of the invention, the grooves with the net-shaped structures are formed in the soft soil foundation, and the grooves are filled with the backfill materials, so that water in the soft soil foundation can be effectively discharged. The physical and chemical properties of soft soil can be changed by filling the sand well with the soil stabilizer, so that the soil stabilizer in the sand well forms a pile foundation with certain strength, rigidity and integrity, and the bearing capacity and stability of the soft soil foundation are improved.

Description

Technical Field

[0001] This application belongs to the field of construction engineering technology, and more specifically, relates to a soft soil foundation reinforcement structure. Background Technology

[0002] Currently, in the construction of infrastructure projects in areas surrounding rivers and lakes, the original soil on site is often silty soil, which has poor mechanical properties, high water content, and is prone to deformation and settlement, making it unsuitable as a foundation, roadbed, or filling material for engineering construction.

[0003] Currently, common methods for treating river and lake silt foundations include drainage consolidation, physical compaction, and soil replacement, but these methods are complex and costly. Therefore, effectively controlling the settlement of soft soil foundations is a pressing issue that needs to be addressed in the construction industry. Utility Model Content

[0004] The purpose of this application is to provide a soft soil foundation reinforcement structure to solve the technical problems of poor mechanical properties of soft soil foundations and easy deformation and settlement in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a soft soil foundation reinforcement structure, including a soft soil foundation;

[0006] A grid-like trench is provided on the soft soil foundation, and the trench is filled with backfill material;

[0007] A sand well is provided at the junction of the trenches, and the depth of the sand well is greater than the depth of the trench; the sand well and the trench corresponding to the sand well are filled with soil stabilizer.

[0008] As an optional implementation, a sand cushion layer is also provided on the surface of the soft soil foundation.

[0009] As an optional implementation, the thickness of the sand cushion layer is 20-35 cm.

[0010] As an optional implementation, the surface of the sand cushion layer is also provided with a geogrid.

[0011] As an optional implementation, the spacing between adjacent trenches is 2 to 5 meters.

[0012] As an optional implementation, the surface of the sand cushion layer is provided with a base layer, and the surface of the base layer is provided with a surface layer.

[0013] As an optional implementation, the width of the trench is 20-50cm and the depth of the trench is 30-60cm.

[0014] As an optional implementation, the length and width of the sand well are greater than the width of the trench, and are 60-80cm; the depth of the sand well is 80-150cm.

[0015] As an alternative implementation, the backfill material is sand and / or steel slag.

[0016] As an optional implementation, the soil stabilizer is prepared using phosphogypsum, slag, and cement.

[0017] The beneficial effects of this application are as follows: By setting up a mesh-structured trench on the soft soil foundation and filling the trench with backfill material, the water in the soft soil foundation can be effectively drained. By filling the sand well with soil stabilizer, the physical and chemical properties of the soft soil can be changed, so that the soil stabilizer in the sand well forms a pile foundation with certain strength, rigidity and integrity, thereby improving the bearing capacity and stability of the soft soil foundation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a top view of a soft soil foundation reinforcement structure without an overlying sand cushion layer, provided in an embodiment of this application.

[0020] Figure 2 For along Figure 1 Cross-sectional view of line AA in the middle;

[0021] Figure 3 A cross-sectional view of a soft soil foundation reinforcement structure provided in an embodiment of this application;

[0022] Figure 4 A top view of a soft soil foundation reinforcement structure without an overlying sand cushion layer, provided in another embodiment of this application;

[0023] Figure 5 For along Figure 4 Cross-sectional view of the middle BB line;

[0024] Figure 6 A cross-sectional view of a soft soil foundation reinforcement structure provided in another embodiment of this application.

[0025] The following are the labeling elements in the figure:

[0026] 1-Soft soil foundation, 2-Trenches, 3-Backfill material, 4-Sand well, 5-Soil stabilizer, 6-Sand cushion layer, 7-Base layer, 8-Surface layer. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0028] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0030] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0031] It should be understood that in the embodiments of this application, "electrical connection" can be understood as physical contact and electrical conduction between components; it can also be understood as the form in which different components in the circuit structure are connected through physical lines that can transmit electrical signals, such as copper foil of a printed circuit board (PCB) or wires.

[0032] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0034] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0035] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments in any suitable manner.

[0036] Please refer to the following: Figures 1-2 , Figures 4-5 The following describes a soft soil foundation reinforcement structure provided in an embodiment of this application. The soft soil foundation reinforcement structure includes a soft soil foundation 1, on which a grid-like trench 2 is provided, and the trench 2 is filled with backfill material 3; a sand well 4 is provided at the junction of the trench 2, and the depth of the sand well 4 is greater than the depth of the trench 2; soil stabilizer 5 is filled in the sand well 4 and in the trench 2 corresponding to the sand well 4.

[0037] For details, see Figure 1 After excavating the soft soil foundation 1 to the design elevation and leveling it, trenches 2 are excavated. The spacing between adjacent trenches 2 is 2-5m, resulting in a grid-like trench structure. Water in the soft soil foundation 1 can seep laterally into the trenches 2. The backfill material 3 in the trenches 2 can collect and partially absorb the water, and then discharge the unabsorbed water to the outside of the trenches 2.

[0038] Optional, see Figure 2 The vertical cross-section of trench 2 can be rectangular. See [link / reference] Figure 5The vertical cross-section of trench 2 can also be semi-circular. When a rectangular trench 2 is used, the width B1 of trench 2 is 20-50cm, and the depth H1 is 30-60cm. When the natural water content of the soft soil is low and the bearing capacity is high, B1 and H1 should be lower values, and vice versa. If the width of trench 2 is too wide, the engineering workload is large and the increase in drainage effect is not significant, resulting in lower technical and economic indicators. If the width of trench 2 is too narrow, the drainage performance will be significantly reduced, and it will be detrimental to the stability of the trench walls.

[0039] After trench 2 is excavated, backfill material 3 should be filled promptly. Optionally, sand can be used as backfill material 3; coarse, medium, or fine sand are all acceptable. Timely backfilling aims to prevent trench 2 from collapsing and increasing subsequent workload. Alternatively, steel slag particles can be used to replace all or part of the backfill sand. Optionally, the replacement amount should not exceed 60% of the total mass, and the steel slag particle size should be 1.5–5 cm. If the steel slag particles are too fine, the processing cost is too high, resulting in low cost-effectiveness. While coarse steel slag particles have lower processing costs, they can lead to excessive volume deformation later, affecting drainage performance.

[0040] At the intersection of the longitudinal and transverse trenches 2, a sand well 4 is excavated. The sand well 4 can be a cuboid or a cylinder. When a cuboid is used, the length L1 / width B2 = 60-80cm. When a cylinder is used, the radius R = 30-50cm. Optionally, the depth of the sand well H2 = 0.8m-1.5m.

[0041] After the sand well 4 is excavated, the soil stabilizer 5 should be filled in a timely manner. When filling, in addition to filling part of the sand well 4, the corresponding part of the trench 2 of the sand well 4 should also be filled to keep the soil stabilizer 5 in the sand well 4 connected from top to bottom.

[0042] This embodiment of the application effectively drains moisture from the soft soil foundation 1 by setting up a mesh-structured trench 2 on the soft soil foundation and filling the trench 2 with backfill material 3. By filling the sand well 4 with soil stabilizer 5, the physical and chemical properties of the soft soil can be changed, so that the soil stabilizer 5 in the sand well 4 forms a pile foundation with certain strength, rigidity and integrity, thereby improving the bearing capacity and stability of the soft soil foundation 1.

[0043] Optionally, soil stabilizer 5 is prepared using phosphogypsum, slag, and cement. It should be noted that soil stabilizer 5 was developed by the inventor and is already existing technology. For details, please refer to the paper entitled "Study on the Mechanical Properties and Mechanism of Slag-Phosphogypsum Synergistic Stabilization of River and Lake Silt" published on CNKI on October 7, 2023.

[0044] Specifically, phosphogypsum is an industrial solid waste from the phosphate chemical industry. Currently, a large amount of phosphogypsum is disposed of through stockpiling, which not only occupies land resources but also causes environmental pollution. This application's embodiment improves the mechanical properties of soft soil foundation 1 by adding phosphogypsum as a component of a cementing material.

[0045] Optionally, in soil stabilizer 5, phosphogypsum accounts for 34% of the total mass, slag accounts for 56%, and cement accounts for 10%. Since moisture in the soft soil foundation 1 penetrates into the sand wells 4, and phosphogypsum has certain water absorption and cementing properties, it can absorb some of the moisture; in addition, cement can consume a large amount of water and release a large amount of heat, thereby evaporating some of the moisture. The combined effect of these two processes can consume the moisture that seeps into the sand wells 4, thus reducing the natural moisture content of the soft soil foundation 1 and increasing its composite bearing capacity. Simultaneously, the hydration reaction products have cementing properties; after solidification, they can enable the sand wells 4 to form pile foundations with a certain strength, stiffness, and integrity, further improving the bearing capacity of the composite foundation.

[0046] Optionally, to further improve the water absorption of soil stabilizer 5, hemihydrate phosphogypsum can be used instead of phosphogypsum, which is obtained by partially dehydrating phosphogypsum.

[0047] The formation of a large gel phase in slag under alkaline activation is the main reason for its strength. Slag mainly consists of an unstable glassy structure of CaO-Al2O3-SiO2 system, with a small amount of silicate and aluminate microcrystals. When slag is in an alkaline environment, the glassy structure breaks down, and the resulting hydration products form a network structure between soil particles, creating a framework with a certain strength. The cement in soil stabilizer 5, after hydration, not only increases the soil strength but also provides Ca(OH)2 for slag activation, becoming an alkaline activator for the slag. Phosphogypsum mainly acts as a sulfate activator. In the alkaline environment provided by cement, the activity of the slag is fully utilized. In the Ca(OH)2 environment, phosphogypsum combines with the active Al2O3 in the slag to form ettringite (AFt), resulting in higher strength.

[0048] When the moisture content of the soft soil foundation 1 is too high, a sand cushion layer 6 can be added, mainly for lateral drainage. The specific operation is as follows: the sand cushion layer 6 should be 20–35 cm thick. When the thickness is less than 20 cm, the lateral drainage effect is limited; when the thickness exceeds 35 cm, on the one hand, the required amount of sand increases significantly, which is not economical, and on the other hand, the increase in lateral drainage effect is limited, resulting in poor technical and economic efficiency. Therefore, the optimal thickness of the sand cushion layer 6, balancing economy and performance, is 20–35 cm. When the moisture content is below 45%, the sand cushion layer 6 may not be necessary.

[0049] When the bearing capacity of the soft soil foundation 1 is low but the required strength for the project is high, a layer of geogrid (not shown in the figure) can be laid on the surface of the sand cushion layer 6 to improve the bearing capacity of the soft soil foundation 1. During subsequent filling, if soft soil is used, the sand wells 4 must be connected vertically. When the spacing of the trenches 2 is large, such as 4-5m, and the soft soil has a high water content, in order to quickly drain the water from the soft soil, an additional trench 2 can be added between adjacent trenches 2 and filled with backfill sand and / or steel slag. If ordinary soil is used for filling, it can be directly filled according to the roadbed filling method.

[0050] This application embodiment uses a soil stabilizer 5 prepared from phosphogypsum, slag, and cement as the foundation treatment material. Through the aforementioned reinforcement structure, industrial solid waste is synergistically utilized, effectively solving the problem of solid waste utilization and treatment, reducing the environmental impact of industrial solid waste emissions, and demonstrating good environmental protection effects. Simultaneously, it reduces the demand for natural resources such as sand and gravel in the foundation treatment project and improves the reinforcement effect of the soft soil foundation 1.

[0051] It is readily understood that the soft soil foundation reinforcement structure 1 of this application embodiment can be applied to foundations, roadbeds, etc., in engineering construction. See also Figure 3 and Figure 6 When the soft soil foundation 1 reinforcement structure is applied to the roadbed, a base course 7 is provided on the surface of the sand cushion layer 6, and a surface course 8 is provided on the surface of the base course 7.

[0052] The surface layer is the structural layer that directly bears vehicle loads and natural forces, and consists of one or more layers. The surface layer must possess high strength, stability, smoothness, and anti-skid properties, while also exhibiting good wear resistance and impermeability. Surface layer materials primarily include asphalt concrete and cement concrete.

[0053] The base course, located beneath the surface course, primarily functions to bear the vehicle loads transmitted from the surface course and distribute them onto the sand. As the load-bearing layer in the pavement structure, the base course requires high strength and stiffness, as well as good water stability and erosion resistance. Base course materials can include inorganic binder-stabilized aggregates, asphalt-stabilized crushed stone, and lean cement concrete, among others.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A soft ground foundation reinforcing structure, characterized by, The invention relates to a soft soil foundation. A grid-shaped trench is arranged on the soft soil foundation, and the trench is filled with backfill material. Sand wells are arranged at the intersection of the trench, and the depth of the sand well is greater than the depth of the trench; the sand well and the trench corresponding to the sand well are filled with soil stabilizer.

2. The soft ground reinforcement structure of claim 1, wherein A sand cushion layer is further arranged on the surface of the soft soil foundation.

3. The soft ground reinforcement structure of claim 2, wherein, The thickness of the sand cushion layer is 20-35 cm.

4. The soft ground reinforcement structure of claim 2, wherein A geogrid is further arranged on the surface of the sand cushion layer.

5. The soft ground reinforcement structure of claim 1, wherein The distance between adjacent trenches is 2-5 m.

6. The soft ground reinforcement structure of claim 2, wherein A base layer is arranged on the surface of the sand cushion layer, and a surface layer is arranged on the surface of the base layer.

7. The soft ground reinforcement structure of claim 1, wherein The width of the trench is 20-50 cm, and the depth of the trench is 30-60 cm.

8. The soft ground reinforcement structure of claim 1, wherein, The length and width of the sand well are greater than the width of the trench, and are 60-80 cm; the depth of the sand well is 80-150 cm.

9. The soft ground reinforcement structure according to any one of claims 1 to 8, wherein The backfill material is sand or steel slag.

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