Checking calculation method for reinforced soil retaining wall panel strength under fence load effect

Abstract

The invention relates to the field of design of reinforced soil retaining walls, and provides a checking calculation method for the panel strength of a reinforced soil retaining wall under the action of a fence load. The method comprises the following steps: firstly, collecting data, and determining basic physical and mechanical indexes and fence load action parameters of a slope soil body; and then active soil pressure acting on different depths of the reinforced soil retaining wall is calculated. And then the maximum active soil pressure acting on the tiepieces of the reinforced soil retaining wall is determined. And calculating the maximum shearing force borne by the reinforced soil retaining wall panel. Preliminarily selecting the width, the section thickness and the strength grade of the reinforced soil retaining wall panel, and calculating the shearing resistance design value of the reinforced soil retaining wall panel. And finally, checking the strength of the reinforced soil retaining wall panel, and adjusting the width, the section thickness and the strength grade of the panel according to a checking result. According to the method, the influence of the fence load on the design of the reinforced soil retaining wall is fully considered, the defect that the reinforced soil retaining wall panel is selected according to experience is overcome, and the design of the reinforced soil retaining wall is more scientific and accurate.

Description

Technical Field

[0001] This invention relates to the field of slope protection technology, and in particular to a method for verifying the strength of reinforced soil retaining wall panels under fence load. Background Technology

[0002] Under the load of a fence, the slope soil is in an overloaded state. Traditionally, the active earth pressure of reinforced soil retaining walls is mostly determined by empirical methods. Although empirical methods have certain practical significance, they lack scientific theoretical guidance. The method for determining the active earth pressure of reinforced soil retaining walls under fence load proposed in this invention is necessary and of practical significance. It improves upon the shortcomings of traditional empirical methods, such as insufficient consideration and lack of scientific theoretical guidance. Calculating the active earth pressure of reinforced soil retaining walls under fence load using this method provides a more scientific reference for retaining wall design. The calculation method proposed in this invention is more scientific and accurate.

[0003] Due to limitations in science and technology, traditional reinforced soil retaining wall designs often involve smaller scales and workloads. In small-scale projects, prefabricated reinforced soil retaining wall panels are typically used without failure, leading to a neglect of panel strength verification. However, with the advancement of technology, slope protection projects are expanding beyond small-scale operations. Neither the "Technical Specifications for Highway Retaining Wall Design and Construction" nor the "Specifications for Highway Reinforced Soil Engineering Design JTJ015—1991" compiled by the Second Highway Survey and Design Institute of China Communications Construction Company (CCCC) includes strength verification for reinforced soil retaining wall panels. Therefore, a method for verifying the strength of reinforced soil retaining wall panels is urgently needed. Damage to the panels poses a significant risk to human life and property. This invention proposes a method for verifying the strength of reinforced soil retaining wall panels under fence loads, which can better ensure project safety and protect human life and property. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention provides a method for verifying the strength of reinforced soil retaining wall panels under fence load.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for verifying the strength of reinforced soil retaining wall panels under fence load, comprising the following steps:

[0006] Step 1: Collect data to determine the basic physical and mechanical properties of the slope soil and the parameters of the fence load. The basic physical and mechanical properties include the soil weight γ and the soil internal friction angle φ. The parameters of the fence load include the magnitude of the fence load p and the horizontal distance m between the fence and the reinforced soil retaining wall panel.

[0007] Step 2: Calculate the effect at different depths z of the reinforced soil retaining wall i Active earth pressure σ xi for

[0008] When z i When ≤H / 2:

[0009]

[0010] When z i >H / 2

[0011]

[0012] K0=1-sinφ (3)

[0013] Where: H is the height of the reinforced soil retaining wall; K0 is the coefficient of earth pressure at rest;

[0014] Step 3: Determine the maximum active earth pressure σ acting on the tie bars of the reinforced soil retaining wall. x The maximum active earth pressure σ x The active earth pressure σ is determined by formulas (1) and (2). xi Maximum value;

[0015] Step 4: Calculate the maximum shear force V on the reinforced soil retaining wall panel. z for

[0016] V z =0.675S x S y σ x (4)

[0017] Among them, S x The lateral spacing of the reinforcing bars for reinforced soil retaining walls; S y The longitudinal spacing of the reinforcing bars for reinforced soil retaining walls;

[0018] Step 5: Select the width b, section thickness t, and strength grade of the reinforced soil retaining wall panel. The strength grades include C20, C25, C30, and C35. Calculate the design shear strength V of the reinforced soil retaining wall panel. u for

[0019] V u =0.7f t bt (5)

[0020] Among them, f t This is the design value for the axial tensile strength of concrete.

[0021] Step 6: Verify the strength of the reinforced soil retaining wall panel. If the design shear strength V... u Greater than the maximum shear force V z If the calculation passes, the verification is successful; otherwise, return to step 5 to reselect the width b, section thickness t, and strength grade of the reinforced soil retaining wall panel until the verification is successful.

[0022] The beneficial effects of adopting the above technical solution are as follows:

[0023] This invention proposes a more scientific method for determining the active earth pressure of reinforced soil retaining walls under actual conditions of fence load. In traditional slope retaining engineering, the active earth pressure of reinforced soil retaining walls under load is often determined using empirical methods, which lack scientific guidance. The method for determining the active earth pressure of reinforced soil retaining walls under fence load based on scientific guidance proposed in this invention is very necessary. It improves upon the shortcomings of traditional empirical methods, such as insufficient consideration and lack of scientific basis. Calculating the active earth pressure of reinforced soil retaining walls under fence load using this method provides a more scientific reference for retaining wall design.

[0024] This invention proposes a method for verifying the strength of reinforced soil retaining wall panels under fence loads. Traditionally, due to the relatively small scale and load of reinforced soil retaining wall projects, the strength verification of reinforced soil retaining wall panels is often neglected. The "Technical Specifications for Design and Construction of Highway Retaining Walls" and the "Design Specifications for Highway Reinforced Soil Engineering JTJ015—1991" edited by China Communications Second Highway Survey and Design Institute Co., Ltd. do not include strength verification for reinforced soil retaining wall panels. However, with the increasing scale and volume of reinforced soil retaining wall projects, strength verification of reinforced soil retaining wall panels has become more necessary. This invention addresses the deficiency of rarely verifying panel strength in existing projects, effectively preventing damage to reinforced soil retaining wall panels and avoiding property loss. Attached Figure Description

[0025] Figure 1 This invention provides a method for verifying the strength of a reinforced soil retaining wall panel under fence load in an embodiment of the present invention.

[0026] Figure 2 This is an engineering model diagram in an embodiment of the present invention;

[0027] Figure 3 This is an active earth pressure curve diagram from an embodiment of the present invention;

[0028] Figure 4 This is a diagram illustrating the interaction between the tie rod and the panel in an embodiment of the present invention; Detailed Implementation

[0029] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0030] In this embodiment, taking a slope that requires reinforced soil retaining wall support as an example, there is a fence behind the slope, which exerts a load on the slope.

[0031] like Figure 1 As shown in this embodiment, a method for verifying the strength of a reinforced soil retaining wall panel under fence load includes the following steps:

[0032] Step 1: Collect data to determine the basic physical and mechanical properties of the slope soil and the parameters of the fence load. The basic physical and mechanical properties include the soil weight γ and the internal friction angle of the soil. The parameters of the fence load include the magnitude of the fence load p and the horizontal distance m between the fence and the reinforced soil retaining wall panel.

[0033] In this embodiment, the soil weight γ in the basic physical and mechanical properties of the slope soil is 18.5 kN / m. 3 Internal friction angle of soil The angle is 35°. In the fence load parameters, the magnitude of the fence load p is 500 kN / m, and the horizontal distance m between the fence and the reinforced soil retaining wall panel is 3 m. The engineering model is as follows: Figure 2 As shown;

[0034] Step 2: Calculate the effect at different depths z of the reinforced soil retaining wall i Active earth pressure σ xi for

[0035] When z i When ≤H / 2:

[0036]

[0037] When z i >H / 2

[0038]

[0039] K0=1-sinφ (3)

[0040] Where: H is the height of the reinforced soil retaining wall; K0 is the coefficient of earth pressure at rest;

[0041] In this embodiment, the internal friction angle of the soil in step 1 is... Substituting 35° into formula (3), we obtain the coefficient of earth pressure at rest, K0:

[0042]

[0043] Substituting the other parameters collected in step 1 into formulas (1) and (2), the active earth pressure of the reinforced soil retaining wall is shown in Table 1. The distribution curve of the active earth pressure of the reinforced soil retaining wall is shown in Table 1. Figure 3 As shown;

[0044] Step 3: Determine the maximum active earth pressure σ acting on the tie bars of the reinforced soil retaining wall. x The maximum active earth pressure σ x The active earth pressure σ is determined by formulas (1) and (2). xi Maximum value;

[0045] In this embodiment, the active earth pressure σ is determined by formulas (1) and (2). xi The maximum value, i.e., the maximum active earth pressure σ x =45.89 kPa;

[0046] Table 1 Distribution of Active Earth Pressure on Reinforced Soil Retaining Wall

[0047]

[0048] Step 4: Calculate the maximum shear force V on the reinforced soil retaining wall panel. z for

[0049] V z =0.675S x S y σ x (4)

[0050] Among them, S x The lateral spacing of the reinforcing bars for reinforced soil retaining walls; S y The longitudinal spacing of the reinforcing bars for reinforced soil retaining walls;

[0051] In this embodiment, the lateral spacing S of the reinforcing bars in the reinforced soil retaining wall x =1.0m, longitudinal spacing S of the reinforcing bars in the reinforced soil retaining wall y =0.5m, maximum active earth pressure σ x =45.89 kPa, S x S y , σ x Substituting into formula (4), we obtain the maximum shear force V borne by the reinforced soil retaining wall panel. z =15.48kN, the function of the reinforcing bars and the panel of the reinforced soil retaining wall is as follows Figure 4 As shown;

[0052] Step 5: Select the width b, section thickness t, and strength grade of the reinforced soil retaining wall panel. The strength grades include C20, C25, C30, and C35. Calculate the design shear strength V of the reinforced soil retaining wall panel. u for

[0053] V u =0.7f t bt (5)

[0054] Among them, f t This is the design value for the axial tensile strength of concrete.

[0055] In this embodiment, the width of the reinforced soil retaining wall panel is selected as b = 500mm, the section thickness as t = 80mm, and C20 concrete is initially selected. The design value of the axial tensile strength of the concrete is f. t =1.10 N / mm 2 Substituting into formula (5), the design value of shear strength V of the reinforced soil retaining wall panel is calculated. u =30.80kN;

[0056] Step 6: Verify the strength of the reinforced soil retaining wall panel. If the design shear strength V... u Greater than the maximum shear force V z If the calculation passes, the verification is successful; otherwise, return to step 5 and reselect the width b, section thickness t, and strength grade of the reinforced soil retaining wall panel until the verification is successful.

[0057] In this embodiment, the shear force design value V u =30.80kN, greater than the maximum shear force V z =15.48kN, verification passed.

[0058] Obviously, the above embodiments are only some embodiments of the present invention, and not all embodiments. The above embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention. Based on the above embodiments, all other embodiments obtained by those skilled in the art without creative effort, that is, all modifications, equivalent substitutions and improvements made within the principles of this application, fall within the scope of protection claimed by the present invention.

Claims

1. A method for verifying the strength of a reinforced soil retaining wall panel under fence load, characterized in that, Includes the following steps: Step 1: Collect data to determine the basic physical and mechanical properties of the slope soil and the parameters of the fence load. The basic physical and mechanical properties include the soil weight γ and the internal friction angle of the soil. The parameters of the fence load include the magnitude of the fence load p and the horizontal distance m between the fence and the reinforced soil retaining wall panel. Step 2: Calculate the effect at different depths z of the reinforced soil retaining wall i Active earth pressure σ xi for When z i When ≤H / 2: When z i >H / 2 Where: H is the height of the reinforced soil retaining wall; K0 is the coefficient of earth pressure at rest; Step 3: Determine the maximum active earth pressure σ acting on the tie bars of the reinforced soil retaining wall. x The maximum active earth pressure σ x The active earth pressure σ is determined by formulas (1) and (2). xi Maximum value; Step 4: Calculate the maximum shear force V borne by the reinforced soil retaining wall panel. z for V z =0.675S x S y s x (4) Among them, S x The lateral spacing of the reinforcing bars for reinforced soil retaining walls; S y The longitudinal spacing of the reinforcing bars for reinforced soil retaining walls; Step 5: Select the width b, section thickness t, and strength grade of the reinforced soil retaining wall panel. The strength grades include C20, C25, C30, and C35. Calculate the design shear strength V of the reinforced soil retaining wall panel. u for V u =0.7f t bt (5) Among them, f t This is the design value for the axial tensile strength of concrete; Step 6: Verify the strength of the reinforced soil retaining wall panel. If the design shear strength V... u Greater than the maximum shear force V z If the calculation passes, the verification is successful; otherwise, return to step 5 to reselect the width b, section thickness t, and strength grade of the reinforced soil retaining wall panel until the verification is successful.

2. The method for verifying the strength of a reinforced soil retaining wall panel under fence load as described in claim 1, characterized in that, In step 5, the design value V of the shear force of the reinforced soil retaining wall panel is... u The calculation formula is applicable to plain concrete panels and does not consider the influence of steel reinforcement.

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