Research method for size effect of foundation reinforcement bag type component

Abstract

The invention discloses a research method for the size effect of a foundation reinforcement bag type component, and relates to the technical field of environmental geotechnical engineering. The method comprises the steps that a soil bag theoretical model is established according to the mechanical principle of a soil bag reinforced foundation; deriving a theoretical relationship of interaction between the soil body and the soil bag, describing a stress-strain relationship of the soil body by adopting a UH constitutive model, and analyzing the influence of the radius r and the height H of the soil bag on the strength and deformation of the soil bag; through finite element simulation, the influence of the size on the mechanical property of a single soil bag is researched; and a foundation reinforcing structure is constructed, the effect and degree of the size on the soil bag treatment foundation in the combined form are researched, and the optimal size giving consideration to mechanical properties and economic benefits is found. According to the research method for the size effect of the foundation reinforcement bag type component, a practical basis is provided for improvement of a foundation reinforcement technology, the foundation bearing capacity can be improved, deformation can be reduced, and the research method has the advantages of being economical, environmentally friendly, capable of saving energy and capable of reducing materials.

Description

Technical Field

[0001] The invention relates to the technical field of environmental geotechnical engineering, in particular to a method for studying the size effect of a bag-type foundation reinforcement component. Background Art

[0002] Ground reinforcement bag components, commonly known as ground fasteners or earthbags, are flexible bodies made of high-strength synthetic fiber materials. This material not only has excellent durability and tensile strength, but can also adapt to various complex terrain conditions and uneven settlement conditions, and exhibits excellent stability under stress conditions. By filling with sand or other types of soil materials, these bag components can significantly increase the shear strength of the internal filling, allowing the entire structure to withstand greater longitudinal loads, which is crucial to ensuring the long-term stability and safety of engineering projects.

[0003] As the scale of modern engineering projects continues to expand and the application scenarios become more and more diverse, the application scope of ground fasteners is also expanding. Today, they are not only widely used in traditional civil engineering and environmental engineering projects, such as foundation reinforcement, vibration reduction treatment, slope protection and dam repair, but also play an important role in extreme environments such as earthquake-resistant engineering and marine engineering. Especially in earthquake-prone areas or offshore platform construction where extreme natural conditions are faced, earthbags have become one of the indispensable key materials due to their unique physical properties.

[0004] In actual engineering practice, earthbags must be able to maintain their functional effectiveness for a long time, especially in projects facing harsh environmental tests. This requires them to not only have sufficient strength to enhance soil stability, control settlement and resist shear failure, but also be able to resist the influence of natural factors such as weathering and corrosion. Therefore, the strength characteristics of earthbags are directly related to the safety and durability of the entire project.

[0005] It is worth noting that the size design of earthbags has an important influence on their final performance. The right size can not only optimize the bearing capacity and reduce deformation, but also effectively control the construction cost. Too small a size may not provide the necessary support, while too large a size may lead to unnecessary material waste. Therefore, studying the "size effect" is extremely critical to determining the best design solution. By deeply analyzing the mechanical behavior of earthbags at different sizes, researchers can provide designers with more accurate and reliable design parameters, thereby ensuring that the engineering structure can maintain good safety and stability in the face of various working conditions. In addition, the study of the "size effect" will also help promote the advancement of material formulation and construction technology. Through a further understanding of the material properties, a new generation of earthbag products that are more efficient, economical and environmentally friendly can be developed. At the same time, based on a deep understanding of the size effect of earthbags, the existing construction process can also be improved to achieve the rational use of resources, reduce the overall engineering investment, and promote sustainable development. Summary of the invention

[0006] The purpose of the present invention is to propose a research method for the size effect of bag-type foundation reinforcement components, which can not only provide designers with more reliable design parameters to ensure the safety and stability of engineering structures under various working conditions, but also help to optimize material formulations and construction processes, reduce engineering investment, and promote sustainable development.

[0007] To achieve the above object, the present invention proposes a method for studying the size effect of bag-type foundation reinforcement components, the steps of which are as follows:

[0008] S1. According to the mechanical principle of soil bag reinforcement foundation, establish the soil bag theoretical model;

[0009] S2. Derive the theoretical relationship between the interaction between soil and earthbags, use the UH model to describe the stress-strain calculation relationship of the soil, and analyze the influence of the radius and height of the earthbag on the bearing capacity and deformation of the earthbag;

[0010] S3. Through finite element simulation, study the effect of size on the mechanical properties of a single earthbag;

[0011] S4. Construct a foundation reinforcement structure, study the effect and degree of the size of the earthbags on the foundation treatment in combination, and find the optimal size that takes into account both mechanical properties and economic benefits.

[0012] Preferably, in S1, it is assumed that the shape of the earthbag is a cylinder and the soil is constrained by the earthbag. According to the mechanical principle of strengthening the foundation with earthbags, the calculation formula of the lateral stress generated by the soil being constrained is as follows:

[0013]

[0014] Among them, σ ris the lateral stress generated by the soil being constrained, T is the restraining tension of the earthbag on the soil, H is the height of the earthbag, and r is the radius of the earthbag.

[0015] Preferably, the calculation formula of the restraining tension T of the soil bag on the soil is as follows:

[0016] T=2πE b π(r-r0)=E b ·2π·Δr;

[0017] Among them, E b is the elastic modulus of the soilbag, r0 is the initial radius of the soilbag, and Δr is the radius change of the soilbag.

[0018] Preferably, in S2, the UH model is used to describe the deformation characteristics of the soil, and the deformation coordination relationship of the earthbag theory model is substituted into the incremental form of the UH model to obtain the stress-strain calculation relationship of the UH model. According to the stress-strain calculation relationship, the earthbag theory is derived by changing the radius r and the height H, and the influence of the size effect on the strength and deformation of the earthbag is analyzed.

[0019] Preferably, in S3, according to the actual size of the earthbag, five groups of three-dimensional calculation model sizes are established using ABAQUS finite element software, and their radius and height are: 0.5m×0.5m, 0.75m×0.5m, 1m×0.5m, 0.5m×0.75m, 0.5m×1m, respectively. The modulus of the earthbag is 5.35GPa, the Poisson's ratio is 0.3, the thickness is 0.01m, and the weight is 100g / m 2 Before calculation, confining pressure is applied to the three-dimensional calculation model, the influence of size effect on the strength and deformation of a single earthbag is analyzed, and a function related to size is established to obtain size equivalent parameters.

[0020] Preferably, in the finite element calculation of the ABAQUS finite element software, the soil material adopts the VMAT subroutine of the UH model. The UH has been embedded in the numerical calculation software and is used to analyze geotechnical engineering problems, which can provide a basis for the finite element calculation of the earthbag in this study.

[0021] Preferably, in S4, based on the actual earthbag structure of the project, a plurality of solid calculation models of earthbags are combined in a staggered arrangement, and the equivalent parameters related to the size of the single earthbags obtained in S3 are used to construct a foundation reinforcement structure. By analyzing the effect and degree of foundation treatment by the earthbags in the combined form, the optimal size that takes into account both mechanical properties and economic benefits is found, which provides a practical basis for the improvement of foundation reinforcement technology, can improve the bearing capacity of the foundation and reduce deformation, and has the advantages of economy, environmental protection, energy saving and material reduction.

[0022] Therefore, the present invention proposes a research method for the size effect of bag-type foundation reinforcement components, and its beneficial effects are as follows:

[0023] (1) The research method of the size effect of bag-type foundation reinforcement components proposed in the present invention is based on the performance of earthbags under different working conditions, proposes equivalent parameters related to the size of earthbags, and constructs a foundation reinforcement structure, which provides a practical basis for the improvement of foundation reinforcement technology, can improve the bearing capacity of the foundation and reduce deformation, and has the advantages of being economical, environmentally friendly, energy-saving and material-reducing;

[0024] (2) The research method of the size effect of the bag-type foundation reinforcement component proposed in the present invention can not only provide designers with more reliable design parameters, but also help optimize material formulation and construction technology, reduce engineering investment, etc.;

[0025] (3) The research method of the size effect of the bag-type foundation reinforcement component proposed in the present invention can select the most economical and reasonable size specifications under the premise of ensuring the mechanical properties, thereby reducing the material cost; at the same time, the optimized design scheme can also reduce the material waste during the construction process and further save engineering expenses.

[0026] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall flow chart of a research method for the size effect of a bag-type foundation reinforcement component of the present invention;

[0028] Figure 2 It is a diagram of the earthbag theory model of a method for studying the size effect of bag-type foundation reinforcement components of the present invention;

[0029] Figure 3 It is a graph of the axial stress-strain curve of the earthbag of a method for studying the size effect of a bag-type component for foundation reinforcement according to the present invention;

[0030] Figure 4 It is a schematic diagram of a three-dimensional calculation model of a research method of the size effect of a bag-type foundation reinforcement component of the present invention;

[0031] Figure 5 It is a simulation diagram of earthbag triaxial compression of a research method of size effect of bag-type foundation reinforcement components of the present invention;

[0032] Figure 6 The invention discloses a design drawing for strengthening a foundation in the form of a combination of earthbags according to a method for studying the size effect of bag-type components for strengthening a foundation. DETAILED DESCRIPTION

[0033] In order to make the technical solutions, advantages and purposes of the present invention clearer, the technical solutions of the embodiments of the present invention are clearly and completely described below. The described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of this application.

[0034] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0035] like Figure 1 As shown, the present invention provides a method for studying the size effect of bag-type foundation reinforcement components, and the specific steps are as follows:

[0036] S1. According to the mechanical principle of soil bag reinforcement foundation, a soil bag theoretical model is established.

[0037] like Figure 2 As shown in the figure, assuming that the shape of the earthbag is cylindrical, the soil is constrained by the earthbag, the vertical major principal stress of the soil unit is σ1, and the lateral stress generated by the soil being constrained is σ2=σ3=σ r According to the mechanical principle of soil bag reinforcement foundation, the calculation formula of lateral stress generated by soil constraint is as follows:

[0038]

[0039] Among them, σ r is the lateral stress generated by the soil being constrained, T is the restraining tension of the earthbag on the soil, H is the height of the earthbag, and r is the radius of the earthbag.

[0040] The calculation formula of the restraint tension T of the earthbag on the soil is as follows:

[0041] T=2πE b (r-r0) = E b ·2π·Δr;

[0042] Among them, E b is the elastic modulus of the soilbag, r0 is the initial radius of the soilbag, and Δr is the radius change of the soilbag.

[0043] S2. Derive the theoretical relationship between the interaction between soil and earthbags, use the UH model to describe the stress-strain calculation relationship of the soil, and analyze the influence of the radius and height of the earthbag on the bearing capacity and deformation of the earthbag.

[0044] like Figure 3As shown in the figure, the UH model is used to describe the deformation characteristics of soil. The deformation coordination relationship of the earthbag theory model is substituted into the incremental form of the UH model to obtain the stress-strain calculation relationship of the UH model. According to the stress-strain calculation relationship, the earthbag theory is derived by changing the parameters of radius r and height H, and the influence of size effect on the strength and deformation of earthbags is analyzed.

[0045] S3. Through finite element simulation, study the influence of size on the mechanical properties of a single earthbag;

[0046] like Figure 4-5 As shown in the figure, according to the actual size of the earthbag, five groups of three-dimensional calculation model sizes were established using ABAQUS finite element software. Their radius and height are: 0.5m×0.5m, 0.75m×0.5m, 1m×0.5m, 0.5m×0.75m, 0.5m×1m, respectively. The modulus of the earthbag is 5.35GPa, the Poisson's ratio is 0.3, the thickness is 0.01m, and the weight is 100g / m 2 In the finite element calculation of ABAQUS finite element software, the soil material adopts the VMAT subroutine of the UH model, and the UH model has been embedded in the numerical calculation software and used to analyze geotechnical engineering problems, which can provide a basis for the finite element calculation of the earthbag in this study. Before the calculation, the confining pressure is applied to the three-dimensional calculation model, the influence of the size effect on the strength and deformation of a single earthbag is analyzed, and the function related to the size is established to obtain the size equivalent parameters.

[0047] S4. Construct a foundation reinforcement structure, study the effect and degree of the size of the earthbags on the foundation treatment in combination, and find the optimal size that takes into account both mechanical properties and economic benefits.

[0048] like Figure 6 As shown, according to the actual earthbag structure of the project, a physical calculation model of multiple earthbags is combined in a staggered arrangement, and the equivalent parameters related to the size of the single earthbag obtained in step S3 are used to construct a foundation reinforcement structure. By analyzing the effect and degree of foundation treatment by earthbags in the combined form, the optimal size that takes into account both mechanical properties and economic benefits is found, which provides a practical basis for the improvement of foundation reinforcement technology, can improve the bearing capacity of the foundation and reduce deformation, and has the advantages of economy, environmental protection, energy saving and material reduction.

[0049] Therefore, the present invention proposes a research method for the size effect of bag-type components for foundation reinforcement, and for the first time studies the "size effect" of earthbags on their bearing capacity and deformation, solves the practical design problem of earthbags in foundation reinforcement, and finds the optimal size that takes into account both mechanical properties and economic benefits by calculating and fitting the equivalent parameters related to the earthbag size, thereby making the theory of the physical mechanism related to earthbags more perfect and achieving better economic benefits in actual engineering.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for studying the size effect of bag-type foundation reinforcement components, characterized in that: The specific steps are as follows: S1. According to the mechanical principle of soil bag reinforcement foundation, establish the soil bag theoretical model; S2. Derive the theoretical relationship between the interaction between soil and earthbags, use the UH model to describe the stress-strain calculation relationship of the soil, and analyze the influence of the radius and height of the earthbag on the bearing capacity and deformation of the earthbag; S3. Through finite element simulation, study the effect of size on the mechanical properties of a single earthbag; S4. Construct a foundation reinforcement structure, study the effect and degree of the size of the earthbags on the foundation treatment in combination, and find the optimal size that takes into account both mechanical properties and economic benefits.

2. The method for studying the size effect of bag-type foundation reinforcement components according to claim 1 is characterized in that: In S1, it is assumed that the shape of the earthbag is cylindrical and the soil is constrained by the earthbag. According to the mechanical principle of strengthening the foundation with earthbags, the calculation formula of the lateral stress generated by the soil being constrained is as follows: Among them, σ r is the lateral stress generated by the soil being constrained, T is the restraining tension of the earthbag on the soil, H is the height of the earthbag, and r is the radius of the earthbag.

3. The method for studying the size effect of bag-type foundation reinforcement components according to claim 2 is characterized in that: The calculation formula of the restraining tension T of the earthbag on the soil is as follows: T=2πE b ·(r-r0)=E b ·2π·Δr; Among them, E b is the elastic modulus of the soilbag, r0 is the initial radius of the soilbag, and Δr is the radius change of the soilbag.

4. The method for studying the size effect of bag-type foundation reinforcement components according to claim 1 is characterized in that: In S2, the UH model is used to describe the deformation characteristics of the soil. The deformation coordination relationship of the soilbag theoretical model is substituted into the incremental form of the UH model to obtain the stress-strain calculation relationship of the UH model. According to the stress-strain calculation relationship, the soilbag theory is derived by changing the radius r of the soilbag and the height H of the soilbag, and the influence of the size effect on the strength and deformation of the soilbag is analyzed.

5. The method for studying the size effect of bag-type foundation reinforcement components according to claim 1 is characterized in that: In S3, five groups of three-dimensional calculation model sizes were established using ABAQUS finite element software according to the actual earthbag sizes. Their radii and heights were: 0.5m×0.5m, 0.75m×0.5m, 1m×0.5m, 0.5m×0.75m, 0.5m×1m. The modulus of the earthbags was 5.35GPa, the Poisson’s ratio was 0.3, the thickness was 0.01m, and the weight was 100g / m 2 Before calculation, confining pressure is applied to the three-dimensional calculation model, the influence of size effect on the strength and deformation of a single earthbag is analyzed, and a function related to size is established to obtain size equivalent parameters.

6. A method for studying the size effect of bag-type foundation reinforcement components according to claim 5, characterized in that: In the finite element calculation of the ABAQUS finite element software, the soil material adopts the VMAT subroutine of the UH model. The UH model has been embedded in the numerical calculation software to provide a basis for the finite element calculation of the earthbag.

7. The method for studying the size effect of bag-type foundation reinforcement components according to claim 1 is characterized in that: In S4, based on the actual earthbag structure of the project, a physical calculation model of multiple earthbags is combined in a staggered arrangement. The equivalent parameters related to the size of the single earthbag obtained in S3 are used to construct a foundation reinforcement structure. By analyzing the effect and degree of foundation treatment of the earthbags in the combined form, the optimal size that takes into account both mechanical properties and economic benefits is found.

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