Method for calculating bearing capacity of foundation by using double-load-plate field test

Abstract

A method for calculating the bearing capacity of a foundation through a double-load-plate field test comprises the steps that S100, flat plates with the diameters of B1 and B2 are used for carrying out two times of flat plate load tests, and ultimate bearing capacity Qu1 and Qu2 of the flat plates are obtained; s200, the ultimate bearing capacities qu1 and qu2 of the foundation in unit area under the condition of the plate load test are obtained respectively; s300, the bearing capacity coefficient Nr of the foundation is calculated according to a formula; s400, looking up a table to obtain a friction angle phi according to the bearing capacity coefficient Nr, and looking up the table according to the friction angle phi to obtain a bearing capacity coefficient Nc of the strip foundation; and S500, calculating according to a formula to obtain the value of the soil cohesive force c, and obtaining the relatively accurate foundation bearing capacity of various different structures under different conditions according to the obtained values of the soil cohesive force c and the friction angle phi. The method can be widely applied to slope stability checking calculation and structural design of retaining walls, culverts, tunnels, dams, bridge foundations and the like needing soil acting force calculation.

Description

Technical Field

[0001] The invention relates to the technical field of foundation design for civil engineering, and in particular to a method for calculating foundation bearing capacity by using a double load plate field test. Background Art

[0002] The accurate evaluation of foundation bearing capacity is a very important and unresolved problem in the field of civil engineering. Currently, there are two main rough evaluation methods that are actually useful:

[0003] One method is to convert the N value obtained from the "standard penetration test" into cohesion c and internal friction angle φ, and then calculate the foundation bearing capacity based on the c and φ values ​​using the Terzaghi formula. Another method is to use a 30cm diameter load plate to conduct a field loading test (load test method) on site to directly obtain the foundation bearing capacity per unit area.

[0004] However, since the former only calculates the c and φ values ​​based on the N value, its accuracy is poor, so it is generally only used for preliminary design estimates. As for the latter, since the load plate is too small, it can only obtain the local maximum bearing capacity, but cannot obtain the overall foundation bearing capacity of the structure based on the size effect of the shape coefficient of the structure and the eccentric bearing capacity coefficient of the load. Therefore, its accuracy and usability are greatly reduced. It is extremely unrealistic to use a load test equivalent to the actual scale of the structure. Therefore, the relatively accurate calculation of C and φ, two coefficients representing the foundation strength, becomes a necessary condition for relatively accurate calculation of the foundation bearing capacity. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a method for calculating foundation bearing capacity using a double load plate field test, which overcomes the above problems or at least partially solves the above problems.

[0006] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention discloses a method for calculating foundation bearing capacity using a double load plate field test, comprising:

[0008] S100. Two plate load tests were carried out using plates with diameters B1 and B2, and their ultimate bearing capacities Q u1 and Q u2 ;

[0009] S200. Obtain the ultimate bearing capacity per unit area of ​​the foundation q under the flat plate load test u1 and q u2 ;

[0010] S300. Calculate the bearing capacity coefficient Nr of the foundation according to the formula;

[0011] S400. According to the bearing capacity coefficient Nr, obtain the friction angle φ by looking up the table, and then obtain the bearing capacity coefficient Nc of the strip foundation according to the friction angle φ by looking up the table;

[0012] S500. The soil cohesion c value is calculated according to the formula, and the relatively accurate foundation bearing capacity of various structures under different conditions is obtained based on the obtained soil cohesion c and friction angle φ.

[0013] Furthermore, in S100, two plate load tests were performed using plates with diameters B1 and B2, and their ultimate bearing capacities Q u1 and Q u2 ,The specific formulas include;

[0014] Qu=πB 2 (1.3cNcSc+0.3Bγ1N γ S γ ) / 4

[0015] Among them, Q represents the ultimate bearing capacity obtained from the flat plate load test; B represents the load plate diameter; c represents the cohesion of the soil; γ1 represents the unit volume weight of the foundation; Nc, Nγ represent the bearing capacity coefficient of the strip foundation; Sc, Sγ represent the correction coefficient determined by the size effect of the bearing capacity coefficient.

[0016] Furthermore, in S200, the ultimate bearing capacity per unit area of ​​the foundation under the flat plate load test q u1 and q u2 ; The specific formulas include:

[0017] q u =Q u / (πB 2 / 4)=1.3c N c S c +0.3Bγ1N γ S γ

[0018] =2.8c (2 / 3) N c +0.3B (2 / 3) γ1N γ

[0019] Among them, Q represents the ultimate bearing capacity obtained from the flat plate load test; B represents the load plate diameter; c represents the cohesion of the soil; γ1 represents the unit volume weight of the foundation; Nc, Nγ represent the bearing capacity coefficient of the strip foundation; Sc, Sγ represent the correction coefficient determined by the size effect of the bearing capacity coefficient.

[0020] Further, in S300, the bearing capacity coefficient Nr of the foundation is calculated according to the formula. The specific method includes: obtaining the load plate diameter B1 during the first test, the foundation bearing capacity q u1 ; The load plate diameter for the second test is B2, and the foundation bearing capacity is q u2 ; Then the foundation bearing capacity q of the first experiment is obtained u1 Formula and the bearing capacity q of the foundation in the second experiment u1 formula:

[0021] q u1 =2.8c (2 / 3) N c +0.3B1 (2 / 3) γ1N γ

[0022] q u2 =2.8c (2 / 3) N c +0.3B2 (2 / 3) γ1N γ

[0023] Among them, c represents the bonding of soil, Nr represents the bearing capacity coefficient of strip foundation, γ1 represents the unit volume weight of foundation, B1 and B2 represent the diameters of loading plates with different diameters in two times.

[0024] Furthermore, in S300, the specific formula of the bearing capacity coefficient Nr includes:

[0025]

[0026] Among them, q u1 represents the bearing capacity of the foundation in the first experiment, q u2 represents the bearing capacity of the foundation in the second experiment, γ1 represents the unit volume weight of the foundation, and B1 and B2 represent the diameters of the load plates with different diameters used for loading in two times.

[0027] Further, in S400, according to the bearing capacity coefficient Nr of the strip foundation, the friction angle φ is obtained by looking up a table. The specific method includes: obtaining a graph of the soil friction angle φ under the condition of known Nr and loading direction θ. Since the loading direction during the flat plate load test is perpendicular to the flat plate, that is, θ=0, tanθ=0, and Nr is represented on the graph as its vertical axis. From the graph of the soil friction angle φ, the value of the soil friction angle φ can be found according to the Nr value.

[0028] Further, in S500, the soil cohesion c value is calculated according to the formula, and the specific method includes:

[0029]

[0030] Among them, q u1 represents the bearing capacity of the foundation in the first experiment, q u2 represents the bearing capacity of the foundation in the second experiment, Nc represents the bearing capacity coefficient of the strip foundation, and B1 and B2 represent the diameters of the loading plates with different diameters used for the two loading operations.

[0031] The present invention also discloses an electronic device, comprising:

[0032] one or more processors;

[0033] A memory for storing one or more programs;

[0034] When the one or more programs are executed by the one or more processors, the one or more processors implement the method for calculating the foundation bearing capacity.

[0035] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0036] The embodiment of the present invention discloses a method for calculating foundation bearing capacity using a double load plate field test, comprising: S100. Two plate load tests are performed using plates with diameters B1 and B2 to obtain their ultimate bearing capacities Q u1 and Q u2 ; S200. The ultimate bearing capacity per unit area of ​​the foundation under the flat plate load test q u1 and q u2 ; S300. Calculate the bearing capacity coefficient Nr of the foundation according to the formula; S400. According to the bearing capacity coefficient Nr, look up the table to obtain the friction angle φ, and then look up the table according to the friction angle φ to obtain the bearing capacity coefficient Nc of the strip foundation; S500. Calculate the soil cohesion c value according to the formula, and according to the obtained soil cohesion c and friction angle φ, calculate the relatively accurate foundation bearing capacity of various structures under different conditions.

[0037] The present invention is not only used to calculate the bearing capacity of the foundation, but also as the most accurate and reliable method for evaluating the two main foundation strength coefficients c and φ, it can be widely used in slope stability verification, retaining walls, culverts, tunnels, dams, bridge foundations and other structural designs that require calculation of soil forces.

[0038] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0040] Figure 1 This is a flow chart of a method for calculating foundation bearing capacity using a double load plate field test in Example 1 of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of an electronic device in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0042] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0043] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a method for calculating foundation bearing capacity using a double load plate field test.

[0044] Example 1

[0045] The present invention discloses a method for calculating the bearing capacity of a foundation using a double load plate field test. Figure 1 ,include:

[0046] S100. Two plate load tests were carried out using plates with diameters B1 and B2, and their ultimate bearing capacities Q u1 and Q u2 Specifically, the ultimate bearing capacity Qu obtained by the flat plate load test is determined according to the load plate diameter B, soil cohesion C, unit volume weight of the foundation γ1, the bearing capacity coefficient Nc, N of the strip foundation and the correction coefficient Sc, Sγ determined by the size effect of the bearing capacity coefficient;

[0047] In S100 of this embodiment, the ultimate bearing capacity Qu obtained by the flat plate load test is determined according to the load plate diameter B, soil cohesion C, foundation unit volume weight γ1, foundation coefficient c, strip foundation bearing capacity coefficient Nc, N and correction coefficient Sc, Sγ determined by the size effect of the bearing capacity coefficient;

[0048] Q u=πB 2 (1.3cNcSc+0.3Bγ1N γ S γ ) / 4

[0049] Among them, Q represents the ultimate bearing capacity obtained from the flat plate load test; B represents the load plate diameter; c represents the cohesion of the soil; γ1 represents the unit volume weight of the foundation; Nc, Nγ represent the bearing capacity coefficient of the strip foundation; Sc, Sγ represent the correction coefficient determined by the size effect of the bearing capacity coefficient.

[0050] S200. Obtain the ultimate bearing capacity per unit area of ​​the foundation q under the flat plate load test u1 and q u2 In S200 of this embodiment,

[0051] According to the above formula, assuming that the foundation bearing capacity per unit area is q u ,but

[0052] S c =(c ＊ ) λ =(c / 10) (-1 / 3) =2.1544c (-1 / 3)

[0053] S γ =(B e / B0) μ =((B–2e B ) / 1.0) (-1 / 3) =B (-1 / 3)

[0054] q u =Q u / (πB 2 / 4)=1.3c N c S c +0.3Bγ1N γ S γ

[0055] =1.3cN c (2.1544c (-1 / 3) )+0.3Bγ1N γ B (-1 / 3)

[0056] After sorting, the calculation formula becomes as follows:

[0057]

[0058] Among them, Q represents the ultimate bearing capacity obtained from the flat plate load test; B represents the load plate diameter; c represents the cohesion of the soil; γ1 represents the unit volume weight of the foundation; Nc, Nγ represent the bearing capacity coefficient of the strip foundation; Sc, Sγ represent the correction coefficient determined by the size effect of the bearing capacity coefficient.

[0059] S300. Calculate the bearing capacity coefficient Nr of the foundation according to the formula; In S300 of this embodiment, the specific method includes: obtaining the load plate diameter B1 during the first test, the foundation bearing capacity q u1 ; The load plate diameter for the second test is B2, and the foundation bearing capacity is q u2 ; Then the foundation bearing capacity q of the first experiment is obtained u1 Formula and the bearing capacity q of the foundation in the second experiment u1 formula:

[0060] q u1 =2.8c (2 / 3) N c +0.3B1 (2 / 3) γ1N γ

[0061] q u2 =2.8c (2 / 3) N c +0.3B2 (2 / 3) γ1N γ

[0062] Among them, c represents the bonding of soil, Nr represents the bearing capacity coefficient of strip foundation, γ1 represents the unit volume weight of foundation, B1 and B2 represent the diameters of loading plates with different diameters in two times.

[0063] In S300 of this embodiment, loading is performed twice using load plates of different diameters, according to the ultimate bearing capacity per unit area of ​​the foundation q u , calculate the bearing capacity coefficient Nr of the strip foundation, and the specific method also includes: combining the foundation bearing capacity q of the first experiment u1 Formula and the bearing capacity q of the foundation in the second experiment u1 Formula, calculate the bearing capacity coefficient Nr of the strip foundation;

[0064]

[0065] Among them, q u1 represents the bearing capacity of the foundation in the first experiment, q u2 represents the bearing capacity of the foundation in the second experiment, γ1 represents the unit volume weight of the foundation, and B1 and B2 represent the diameters of the load plates with different diameters used for loading in two times.

[0066] S400. According to the bearing capacity coefficient Nr, the friction angle φ is obtained by looking up the table, and then according to the friction angle φ, the bearing capacity coefficient Nc of the strip foundation is obtained by looking up the table; in S400 of the present embodiment, according to the bearing capacity coefficient Nr of the strip foundation, the friction angle φ is obtained by looking up the table, and the specific method includes: obtaining a graph of the soil friction angle φ under the conditions of known Nr and loading direction θ, because the loading direction during the flat plate load test is perpendicular to the flat plate, that is, θ=0, and therefore tanθ=0, and Nr is represented on the graph as its vertical axis, and from the graph of the soil friction angle φ, the value of the soil friction angle φ can be found according to the Nr value.

[0067] S500. The soil cohesion c value is calculated according to the formula, and the relatively accurate foundation bearing capacity of various structures under different conditions is obtained based on the obtained soil cohesion c and friction angle φ.

[0068] In S500 of this embodiment, the soil cohesion c value is calculated according to the bearing capacity coefficient Nc of the strip foundation. The specific method includes:

[0069]

[0070] Among them, q u1 represents the bearing capacity of the foundation in the first experiment, q u2 represents the bearing capacity of the foundation in the second experiment, Nc represents the bearing capacity coefficient of the strip foundation, and B1 and B2 represent the diameters of the loading plates with different diameters used for the two loading operations.

[0071] In order to better understand this embodiment, an example is given below for illustration. Taking the calculation of the foundation bearing capacity of the bridge pile foundation as an example, the average N value of the foundation is about 10, and the indoor experimental value is usually judged as a soft foundation and a pile foundation must be used. Among them, the standard penetration test (SPT) is a kind of dynamic probing, which is a method for measuring the foundation bearing capacity of sand or clay on site. The N value obtained by the standard penetration test refers to the number of hammer blows when a hammer with a mass of 63.5 kg falls freely from a height of 76 cm and the standard penetrator is driven into the soil 30 cm. This value is used to judge the properties of the soil, estimate the strength of the soil layer, and further judge the density of the sand, the consistency of clay and silt. The N value obtained by the standard penetration test may be affected by many factors, including soil type, soil moisture, soil density, etc. Therefore, when interpreting and using the N value, it is necessary to comprehensively consider these factors and combine other geological survey data for comprehensive analysis and judgment. However, by adopting this method, the on-site loading test was carried out using load plates with diameters of 30 cm and 40 cm respectively. According to the experimental results, c = 3.9 kN / m2, φ = 41.0° were calculated, so that the pile foundation can be omitted and the direct foundation can be used. This saves 43% of the engineering cost. The specific comparative experimental results are shown in Table 1.

[0072] Table 1 Comparison of calculation results between double load plate test method and other methods

[0073]

[0074] The embodiment of the present invention discloses a method for calculating foundation bearing capacity using a double load plate field test, comprising: S100. Two plate load tests are performed using plates with diameters B1 and B2 to obtain their ultimate bearing capacities Q u1 and Q u2 ; S200. The ultimate bearing capacity per unit area of ​​the foundation under the flat plate load test q u1 and q u2 ; S300. Calculate the bearing capacity coefficient Nr of the foundation according to the formula; S400. According to the bearing capacity coefficient Nr, look up the table to obtain the friction angle φ, and then look up the table according to the friction angle φ to obtain the bearing capacity coefficient Nc of the strip foundation; S500. Calculate the soil cohesion c value according to the formula, and calculate the relatively accurate foundation bearing capacity of various structures under different conditions according to the obtained soil cohesion c and friction angle φ. The present invention can be widely used in slope stability verification, retaining walls, culverts, tunnels, dams, bridge foundations and other structural designs that require calculation of soil forces.

[0075] Example 2

[0076] Based on the same inventive concept, an embodiment of the present disclosure also provides an electronic device. Figure 2 FIG. 1 is a schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure. Figure 2 As shown, an embodiment of the present disclosure provides an electronic device including: one or more processors 101, a memory 102, and one or more I / O interfaces 103. The memory 102 stores one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement any optimization method in the above embodiments; the one or more I / O interfaces 103 are connected between the processor and the memory, and are configured to implement information interaction between the processor and the memory.

[0077] Among them, the processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU), etc.; the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (FLASH); the I / O interface (read-write interface) 103 is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to a data bus (Bus), etc.

[0078] In some embodiments, the processor 101 , the memory 102 , and the I / O interface 103 are connected to each other via a bus 104 , and further connected to other components of the computing device.

[0079] In some embodiments, the one or more processors 101 include a field programmable gate array.

[0080] According to an embodiment of the present disclosure, a computer-readable medium is further provided, wherein a computer program is stored on the computer-readable medium, wherein when the program is executed by a processor, the steps in any optimization method in the above-mentioned embodiment are implemented.

[0081] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0082] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0083] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the embodiments herein can all be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above around their functions. Whether such functions are implemented as hardware or software depends on specific applications and the design constraints imposed on the entire system. A skilled person can implement the described functions in an alternative manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of the present disclosure.

[0084] The steps of the method or algorithm described in conjunction with the embodiments herein may be directly embodied as hardware, a software module executed by a processor, or a combination thereof. The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The ASIC may be located in a user terminal. Of course, the processor and the storage medium may also be present in a user terminal as discrete components.

[0085] For software implementation, the techniques described in this application can be implemented with modules (e.g., procedures, functions, etc.) that perform the functions described in this application. These software codes can be stored in a memory unit and executed by a processor. The memory unit can be implemented within the processor or outside the processor. In the latter case, it is coupled to the processor in a communication manner via various means, which are well known in the art.

[0086] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A method for calculating foundation bearing capacity using a double load plate field test, characterized in that: include: S100. Two plate load tests were carried out using plates with diameters B1 and B2, and their ultimate bearing capacities Q u1 and Q u2 ; S200. Obtain the ultimate bearing capacity per unit area of ​​the foundation q under the flat plate load test u1 and q u2 ; S300. Calculate the bearing capacity coefficient Nr of the foundation according to the formula; S400. According to the bearing capacity coefficient Nr, obtain the friction angle φ by looking up the table, and then obtain the bearing capacity coefficient Nc of the strip foundation according to the friction angle φ by looking up the table; S500. The soil cohesion c value is calculated according to the formula, and the relatively accurate foundation bearing capacity of various structures under different conditions is obtained based on the obtained soil cohesion c and friction angle φ.

2. A method for calculating foundation bearing capacity using a double load plate field test as claimed in claim 1, characterized in that: In S100, two plate load tests were carried out using plates with diameters B1 and B2, and their ultimate bearing capacities Q u1 and Q u2 , specifically including; Q u=πB 2 (1.3cNcSc+0.3Bγ1N γ S γ ) / 4 Among them, Q represents the ultimate bearing capacity obtained from the flat plate load test; B represents the load plate diameter; c represents the cohesion of the soil; γ1 represents the unit volume weight of the foundation; Nc, Nγ represent the bearing capacity coefficient of the strip foundation; Sc, Sγ represent the correction coefficient determined by the size effect of the bearing capacity coefficient.

3. A method for calculating foundation bearing capacity using a double load plate field test as claimed in claim 1, characterized in that: In S200, the ultimate bearing capacity per unit area of ​​the foundation under the flat plate load test q u1 and q u2 ; The specific formula includes: <h2 style=";text-align:left;direction:ltr">q<h2 style=";text-align:left;direction:ltr"> u <h2 style=";text-align:left;direction:ltr"> =Q<h2 style=";text-align:left;direction:ltr"> u <h2 style=";text-align:left;direction:ltr"> / (πB<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> / 4)=1.3c N<h2 style=";text-align:left;direction:ltr"> c <h2 style=";text-align:left;direction:ltr"> S<h2 style=";text-align:left;direction:ltr"> c <h2 style=";text-align:left;direction:ltr"> +0.3Bγ1N<h2 style=";text-align:left;direction:ltr"> γ <h2 style=";text-align:left;direction:ltr"> S<h2 style=";text-align:left;direction:ltr"> γ <h2 style=";text-align:left;direction:ltr"> <2.8c<h2 style=";text-align:left;direction:ltr"> (2 / 3) <h2 style=";text-align:left;direction:ltr"> N<h2 style=";text-align:left;direction:ltr"> c <h2 style=";text-align:left;direction:ltr"> +0.3B<h2 style=";text-align:left;direction:ltr"> (2 / 3) <h2 style=";text-align:left;direction:ltr"> γ1N<h2 style=";text-align:left;direction:ltr"> γ Among them, Q represents the ultimate bearing capacity obtained from the flat plate load test; B represents the load plate diameter; c represents the cohesion of the soil; γ1 represents the unit volume weight of the foundation; Nc, Nγ represent the bearing capacity coefficient of the strip foundation; Sc, Sγ represent the correction coefficient determined by the size effect of the bearing capacity coefficient.

4. A method for calculating foundation bearing capacity using a double load plate field test as claimed in claim 1, characterized in that: In S300, the bearing capacity coefficient Nr of the foundation is calculated according to the formula. The specific method includes: obtaining the load plate diameter B1 during the first test, the foundation bearing capacity q u1 ; The load plate diameter for the second test is B2, and the foundation bearing capacity is q u2 ; Then the foundation bearing capacity q of the first experiment is obtained u1 Formula and the bearing capacity q of the second experiment u1 formula: q u1 =2.8c (2 / 3) N c +0.3B1 (2 / 3) γ1N γ q u2 =2.8c (2 / 3) N c +0.3B2 (2 / 3) γ1N γ Among them, c represents the bonding of soil, Nr represents the bearing capacity coefficient of strip foundation, γ1 represents the unit volume weight of foundation, B1 and B2 represent the diameters of loading plates with different diameters in two times.

5. A method for calculating foundation bearing capacity using a double load plate field test as claimed in claim 1, characterized in that: In S300, the specific formula of bearing capacity coefficient Nr includes: Among them, q u1 represents the bearing capacity of the foundation in the first experiment, q u2 represents the bearing capacity of the foundation in the second experiment, γ1 represents the unit volume weight of the foundation, and B1 and B2 represent the diameters of the load plates with different diameters used for loading in two times.

6. A method for calculating foundation bearing capacity using a double load plate field test as claimed in claim 1, characterized in that: In S400, according to the bearing capacity coefficient Nr of the strip foundation, the friction angle φ is obtained by looking up a table. The specific method includes: obtaining a graph of the soil friction angle φ under the condition of known Nr and loading direction θ. Since the loading direction during the flat plate load test is perpendicular to the flat plate, that is, θ=0, tanθ=0, and Nr is represented on the graph as its vertical axis. From the graph of the soil friction angle φ, the value of the soil friction angle φ can be found according to the Nr value.

7. A method for calculating foundation bearing capacity using a double load plate field test as claimed in claim 1, characterized in that: In S500, the soil cohesion c value is calculated according to the formula, and the specific method includes: Among them, q u1 represents the foundation bearing capacity of the first plate loading test, q u2 represents the bearing capacity of the foundation in the second flat plate loading test, Nc represents the bearing capacity coefficient of the strip foundation, and B1 and B2 represent the diameters of the loading plates with different diameters used for the two loadings.

8. An electronic device comprising: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method for calculating the foundation bearing capacity of claims 1-7.

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