Method and device for determining grading curve of wide graded soil

Abstract

The invention discloses a method and a device for determining a grading curve of wide graded soil, which can be applied to the field of civil engineering, and the method comprises the following steps: determining a fitting curve of a permeability coefficient and an effective particle size of a soil body, and determining the fine particle content of a target grading curve under the effective particle size according to the fitting curve, and performing proportion invariant adjustment on the plurality of grain groups of the grading curve of the soil body in the in-situ engineering site to obtain a plurality of grading points of a target grading curve, and determining the target grading curve according to the fine grain content of the target grading curve under the effective grain size and each grading point. In this way, the second grading points can be determined according to the effective particle size, the target particle size and the corresponding fine particle content, and the multiple second grading points of the target grading curve are obtained by conducting proportion invariant adjustment on the multiple particle groups of the grading curve of the soil body in the in-situ engineering site. Therefore, a target grading curve of the soil body can be determined according to the first grading point and the second grading point, so that grading design of the rejected test soil body is realized.

Description

Technical Field

[0001] The present application relates to the field of civil engineering, and in particular to a method and device for determining a gradation curve of wide-graded soil. Background Art

[0002] Wide-graded soil has the characteristics of strong permeability, high bearing capacity and high shear strength. It is a commonly used foundation bearing body for projects such as roadbed, earth-rock dam, seawall and river embankment.

[0003] At present, indoor dynamic centrifugal model tests can be used to study the response law and damage characteristics of wide-graded soil foundations to earthquakes. The dynamic centrifugal model can be prepared using prototype soil materials and keep the same parameters as the prototype soil. Since the engineering soil (coral soil is used as an example here) has a wide gradation and large particle size, if the original graded soil is used to reshape the model, the total number of soil particles that make up the model foundation is very limited, and the inhomogeneity or discontinuity of the soil particles will be more obvious, that is, the use of the original graded coral soil for modeling will produce a significant particle size effect, and cannot accurately reflect the earthquake liquefaction dynamic response of the in-situ engineering site. Therefore, it is necessary to remove large particles from the original graded soil. If it is necessary to use the dynamic centrifugal model test to reflect the liquefaction dynamic characteristics of a more realistic engineering site, it is also necessary to design the gradation of the test soil after removal. Therefore, how to design the gradation of the test soil after removal is a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0004] The present application provides a method for determining a gradation curve of wide-graded soil, so as to implement gradation design for a test soil body after elimination. The present application also provides a device for determining a gradation curve of wide-graded soil.

[0005] In a first aspect, the present application provides a method for determining a gradation curve of wide-graded soil, comprising:

[0006] Determine a fitting curve of the permeability coefficient of the soil and the effective particle size, and determine the fine particle content of the target gradation curve at the effective particle size according to the fitting curve;

[0007] Adjusting multiple particle groups of the gradation curve of the soil at the in-situ engineering site in a constant ratio to obtain multiple gradation points of the target gradation curve;

[0008] The target gradation curve is determined according to the fine particle content of the target gradation curve at the effective particle size and each gradation point.

[0009] Optionally, each of the multiple gradation points is a first gradation point, and determining the target gradation curve according to the fine particle content of the target gradation curve at an effective particle size and each gradation point includes:

[0010] Determine an initial particle size of an effective particle size and a particle size that is closest to the initial particle size among the preset particle sizes;

[0011] Determine the particle size closest to the initial size as the target particle size of the effective particle size;

[0012] Determine a second grading point of the target grading curve according to the target particle size of the effective particle size and the fine particle content under the target particle size of the effective particle size;

[0013] The target grading curve is determined according to the second grading point and each first grading point.

[0014] Optionally, the fitting curve is determined by:

[0015] Obtain the permeability parameters of soil at different fine particle contents and the particle size of effective particle size;

[0016] The fitting curve is determined by fitting the permeability parameters at different fine particle contents and the corresponding effective particle sizes.

[0017] Optionally, each of the multiple gradation points is a first gradation point, and determining the target gradation curve according to the fine particle content of the target gradation curve at an effective particle size and each gradation point includes:

[0018] Determine an initial particle size of an effective particle size and at least two particle sizes smaller than the initial particle size that are closest to the initial particle size among the preset particle sizes;

[0019] Performing linear interpolation on the gradation points corresponding to the at least two particle sizes and the gradation point corresponding to the initial particle size to obtain a target gradation point corresponding to the target particle size;

[0020] The target gradation curve is determined according to the target gradation point and each of the first gradation points.

[0021] Optionally, the method further includes:

[0022] Obtaining a first permeability coefficient of the soil corresponding to the target gradation curve;

[0023] If the error between the first permeability coefficient and the second permeability coefficient of the soil at the in-situ engineering site is less than or equal to an error threshold, it is determined that the target gradation curve is qualified.

[0024] Optionally, the method further includes:

[0025] If the error between the first permeability coefficient and the second permeability coefficient is greater than an error threshold, determining that the target gradation curve is unqualified;

[0026] If the target gradation curve is unqualified and the first permeability coefficient is greater than the second permeability coefficient, the particle size of the effective particle size is reduced according to a preset adjustment rule; if the target gradation curve is unqualified and the first permeability coefficient is less than the second permeability coefficient, the particle size of the effective particle size is increased according to a preset adjustment rule;

[0027] The adjusted target gradation curve is determined according to the fine particle content of the effective particle size after reducing or increasing the particle size and each gradation point.

[0028] In a second aspect, the present application further provides a device for determining a gradation curve of wide-graded soil, the device comprising:

[0029] A first determination unit is used to determine a fitting curve between the permeability coefficient of the soil and the effective particle size, and determine the fine particle content of the target gradation curve at the effective particle size according to the fitting curve;

[0030] A first adjustment unit is used to adjust the multiple particle groups of the gradation curve of the soil body at the in-situ engineering site in a proportional manner to obtain multiple gradation points of the target gradation curve;

[0031] The second determining unit is used to determine the target gradation curve according to the fine particle content of the target gradation curve at an effective particle size and each gradation point.

[0032] Optionally, each of the plurality of grading points is a first grading point, and the second determining unit is specifically configured to:

[0033] Determine an initial particle size of an effective particle size and a particle size that is closest to the initial particle size among the preset particle sizes;

[0034] Determine the particle size closest to the initial size as the target particle size of the effective particle size;

[0035] Determine a second grading point of the target grading curve according to the target particle size of the effective particle size and the fine particle content at the target particle size of the effective particle size;

[0036] The target grading curve is determined according to the second grading point and each first grading point.

[0037] Optionally, each of the plurality of grading points is a first grading point, and the second determining unit is specifically configured to:

[0038] Determine an initial particle size of an effective particle size and at least two particle sizes smaller than the initial particle size that are closest to the initial particle size among the preset particle sizes;

[0039] Performing linear interpolation on the gradation points corresponding to the at least two particle sizes and the gradation point corresponding to the initial particle size to obtain a target gradation point corresponding to the target particle size;

[0040] The target gradation curve is determined according to the target gradation point and each of the first gradation points.

[0041] Optionally, the first determining unit is specifically configured to:

[0042] Obtain the permeability parameters of soil at different fine particle contents and the particle size of effective particle size;

[0043] The fitting curve is determined by fitting the permeability parameters at different fine particle contents and the corresponding effective particle sizes.

[0044] Optionally, the device further comprises:

[0045] An acquisition unit, used for acquiring a first permeability coefficient of the soil corresponding to the target gradation curve;

[0046] The third determination unit is used to determine that the target gradation curve is qualified if the error between the first permeability coefficient and the second permeability coefficient of the soil at the in-situ engineering site is less than or equal to an error threshold.

[0047] Optionally, the device further comprises:

[0048] a fourth determining unit, configured to determine that the target grading curve is unqualified if an error between the first permeability coefficient and the second permeability coefficient is greater than an error threshold;

[0049] A second adjustment unit, configured to reduce the particle size of the effective particle size according to a preset adjustment rule if the target gradation curve is unqualified and the first permeability coefficient is greater than the second permeability coefficient, and to increase the particle size of the effective particle size according to a preset adjustment rule if the target gradation curve is unqualified and the first permeability coefficient is less than the second permeability coefficient;

[0050] The fifth determining unit is used to determine the adjusted target gradation curve according to the fine particle content of the effective particle size after the particle size is reduced or increased and each gradation point.

[0051] In a third aspect, an embodiment of the present application provides a device, comprising a memory and a processor, wherein the memory is used to store instructions or codes, and the processor is used to execute the instructions or codes so that the device executes any method described in the first aspect.

[0052] In a fourth aspect, an embodiment of the present application provides a computer storage medium, in which a code is stored. When the code is executed, a device executing the code implements the method described in any one of the first aspects above.

[0053] Compared with the prior art, this application has the following beneficial effects:

[0054] Determine the fitting curve of the permeability coefficient and the effective particle size of the soil, determine the fine particle content of the target gradation curve at the effective particle size according to the fitting curve, adjust the multiple particle groups of the gradation curve of the soil at the in-situ engineering site in a constant proportion, obtain multiple gradation points of the target gradation curve, and determine the target gradation curve according to the fine particle content of the target gradation curve at the effective particle size and each gradation point. In the present application, the fine particle content of the target gradation curve at the effective particle size can be determined according to the fitting curve, and then the second gradation point can be determined according to the effective particle size, target particle size and the corresponding fine particle content. According to the multiple particle groups of the gradation curve of the soil at the in-situ engineering site are adjusted in a constant proportion, multiple second gradation points of the target gradation curve are obtained, so that the target gradation curve of the soil can be determined according to the first gradation point and the second gradation point, so as to realize the gradation design of the test soil after the large particles are removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0056] Figure 1 A flow chart of a method for determining a gradation curve of wide-graded soil provided in an embodiment of the present application;

[0057] Figure 2 A schematic diagram of a fitting curve of a permeability parameter at different fine particle contents and a corresponding effective particle size provided in an embodiment of the present application;

[0058] Figure 3 A schematic diagram of a gradation curve of a prototype site soil after removing large particles provided in an embodiment of the present application;

[0059] Figure 4 A schematic diagram of a target gradation curve provided in an embodiment of the present application;

[0060] Figure 5 A schematic structural diagram of a specific implementation of a device for determining a gradation curve of wide-graded soil provided in the present application. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0062] It should be noted that the method and device for determining the grading curve of wide-graded soil provided in the present application are used in the field of civil engineering. The above is only an example and does not limit the application field of the method and device provided in the present application.

[0063] Wide-graded soil has the characteristics of strong permeability, high bearing capacity and high shear strength. It is a commonly used foundation bearing body for projects such as roadbed, earth-rock dam, seawall and river embankment.

[0064] At present, indoor dynamic centrifugal model tests can be used to study the response law and damage characteristics of wide-graded soil foundations to earthquakes. Among them, dynamic centrifugal model tests use centrifugal acceleration fields to compensate for the self-weight stress loss caused by model scaling, restore the 1:1 stress-strain state between the model and the prototype, and reproduce the stress-strain response of the original site. It can directly study the damage process and failure mechanism of common geotechnical engineering objects such as foundation failure, site liquefaction, and pile foundation failure under the action of self-weight and earthquake loads. Therefore, dynamic centrifugal model tests are increasingly widely used in geotechnical engineering seismic research.

[0065] Another advantage of the dynamic centrifuge model test is that the model can be prepared using prototype soil materials and the same parameters as the prototype site soil (i.e., the original site soil) can be maintained. Since the engineering soil (here taking coral soil as an example) has a wide gradation and large particle size, if the original graded soil is used to reshape the model, the total number of soil particles constituting the model foundation is very limited, and the inhomogeneity or discontinuity of the soil particles will be more obvious, that is, the use of the original graded coral soil for modeling will produce a significant particle size effect, and cannot accurately reflect the earthquake liquefaction dynamic response of the in-situ engineering site. Therefore, it is necessary to remove large particles from the original graded soil. If it is necessary to use the dynamic centrifuge model test to reflect the dynamic characteristics of a more realistic engineering site, it is also necessary to design the gradation of the test soil after removal. Therefore, how to design the gradation of the test soil after removal is a technical problem that technicians in this field need to solve urgently.

[0066] In view of this, the present application proposes a method for determining a grading curve of a wide-graded soil, including: determining a fitting curve of the permeability coefficient of the soil body and the effective particle size, determining the fine particle content of the target grading curve at the effective particle size according to the fitting curve, adjusting the multiple particle groups of the grading curve of the soil body at the in-situ engineering site in a constant proportion, obtaining multiple grading points of the target grading curve, and determining the target grading curve according to the fine particle content of the target grading curve at the effective particle size and each grading point. In the present application, the fine particle content of the target grading curve at the effective particle size can be determined according to the fitting curve, and then the second grading point can be determined according to the effective particle size, target particle size and the corresponding fine particle content. According to the multiple particle groups of the grading curve of the soil body at the in-situ engineering site in a constant proportion, multiple second grading points of the target grading curve are obtained, so that the target grading curve of the soil body can be determined according to the first grading point and the second grading point, so as to realize the grading design of the test soil body after elimination.

[0067] The method provided in the embodiment of the present application can be executed by software on a computing device, such as a mobile phone, a tablet computer, a computer, or the like.

[0068] In order to make the technical personnel in this field better understand the present application, the present application is further described in detail below in combination with the drawings and specific implementation methods. The following is an example of the method provided in the present application embodiment being executed by a computing device.

[0069] Figure 1 A flow chart of a method for determining a gradation curve of a wide-graded soil provided in an embodiment of the present application. Figure 1 As shown, the method includes:

[0070] S101: determining a fitting curve between the permeability coefficient of the soil and the effective particle size, and determining the fine particle content of the target gradation curve at the effective particle size according to the fitting curve.

[0071] The computing device determines the fitting curve of the permeability coefficient and the effective particle size of the soil (for example, coral soil), and determines the fine particle content of the target gradation curve at the effective particle size based on the fitting curve, where the effective particle size refers to the mass of soil particles smaller than this particle size accounting for 10% of the total mass of soil particles. The permeability coefficient (k) is a physical quantity that describes the soil body's ability to allow liquid or gas to pass through its pore structure, usually expressed in m / s or cm / s. It reflects the permeability of the soil body and is a key parameter for evaluating the hydraulic properties of the soil body and designing related projects. The permeability coefficient is a quantitative indicator representing the strength of soil permeability. The gradation curve is a curve drawn based on the results of the screening test, which can be expressed in logarithmic coordinates, with the horizontal axis being the particle size and the vertical axis being the soil weight (cumulative percentage) content smaller than (or larger than) a certain particle size. It reflects the relative content of each particle group in the soil and is a geometric figure that intuitively reflects the particle gradation composition of the sediment sample. The slope of the particle gradation curve can roughly determine the uniformity of the soil or whether the gradation is good. If the curve is steeper, it means that the particle sizes are similar and the soil particles are relatively uniform. If the curve is gentler, it means that the particle sizes are very different, the soil particles are uneven, and the grading is good.

[0072] Exemplarily, the fitting curve can be determined by:

[0073] The vibrating sieve machine can be used to conduct multiple tests, and the fine particle content of the soil can be adjusted each time. For example, five tests can be conducted, and the content of coral map fine particles can be adjusted to 0%, 3%, 6%, 9%, and 11.09% respectively in the five tests. In each test, the corresponding permeability coefficient k and the corresponding effective particle size d can be measured using a constant head permeameter. 10 The particle size.

[0074] The computing device can obtain the permeability parameters of the soil at different fine particle contents and the particle size of the effective particle size, as shown in Table 1:

[0075] Table 1

[0076]

[0077] The computing device can fit the permeability parameters under different fine particle contents and the corresponding effective particle sizes to determine a fitting curve, for example, as shown in formula (1), the fitting curve can be as follows: Figure 2 shown.

[0078] k=0.8484d 10 2 (1)

[0079] In some possible implementations, before executing step S101, in order to avoid the particle size effect, the maximum allowable particle size of the test model is determined. The specific process of removing coarse particles of the soil using a vibrating screen provided in the embodiment of the present application can be as follows:

[0080] For example, according to the Technical Specification for Geotechnical Centrifuge Model Test (DL / T 5102-2013), "For coarse-grained soil, the maximum allowable particle size should not exceed 1 / 20 to 1 / 10 of the model width, and the average particle size should not exceed 1 / 250 to 1 / 60 of the model width". The model box width used in this model test can be 500mm. In order to avoid the adverse effects of the particle size effect, it can be determined according to the specification that the maximum particle size of the soil should be less than 1 / 20 of the model width, that is, 25mm, and the average particle size should be less than 1 / 250 of the model width, that is, 2mm. The "Standard for Geotechnical Test Methods" (GB / T 50123-2019) recommends that the main methods for dealing with oversized particles in coarse-grained soil are elimination method, equal amount substitution method, similar grading method and mixed grading method. When designing the gradation for the wide-graded soil test, gravel particles larger than 2 mm can be retained to ensure that the engineering classification of the test soil is consistent with the soil of the prototype site, which is coarse-grained soil and has the properties of gravel soil; secondly, from the soil skeleton theory, it can be known that if a small amount of coarse particles (for example, less than 40% content) are suspended between fine particles, the presence of coarse particles has almost no effect on the mechanical properties of the soil. Exemplarily, the elimination method is used to remove particles with a particle size of 5 mm or more. At this point, it can be preliminarily determined that the maximum particle size of the test soil is 5 mm, the average particle size is 0.42 mm, and the gradation curve can be as follows Figure 3 As shown, it meets the requirements of the "Technical Regulations for Geotechnical Centrifuge Model Test". The coral soil gradation preliminarily determined in this test may include particles <0.075mm~5mm, which is a wide-graded soil rich in gravel, sand and powder. Finally, a vibrating screen can be used to retain the 2-5mm gravel group particles in the soil. On the one hand, this ensures that the engineering classification of the test soil is consistent with the prototype site soil, which belongs to coarse-grained soil; on the other hand, it does not have a significant impact on the effective skeleton of the soil after elimination. Then step S101 can also be performed using the soil after elimination as an example.

[0081] In some possible implementations, after determining the fitting curve, the computing device may determine the fine particle content of the target grading curve at the effective particle size according to the fitting curve.

[0082] In some possible implementations, a computing device can determine an initial particle size of an effective particle size and a particle size among preset particle sizes that is closest to the initial particle size, and determine the particle size closest to the initial size as a target particle size of the effective particle size, based on the target particle size of the effective particle size and the fine particle content at the target particle size of the effective particle size.

[0083] For example, in the embodiment of the present application, the particle groups of the grading curve are <0.075mm, 0.075mm-0.1mm, 0.1-0.25mm, 0.25-0.5mm, 0.5-1.0mm, 1.0mm-2.0mm and 2.0mm-5.0mm, that is, the preset particle sizes are 0.075mm, 0.1mm, 0.25mm, 0.5mm, 1mm, 2mm and 5mm, respectively. For example, the effective The particle size is 0.27mm, that is, the initial particle size is 0.27mm. For the convenience of calculation, according to the above particle group, it can be determined that the particle size closest to the initial particle size in the preset particle size is 0.25mm. In this case, the effective particle size of the target grading curve can be determined to be 0.25mm. The fine particle content of the target grading curve at 0.25mm can be determined, and then the corresponding grading point can be determined according to the effective particle size and the corresponding fine particle content.

[0084] In certain possible implementation methods, the embodiments of the present application can also determine the initial particle size of the effective particle size and at least two particle sizes that are smaller than the initial particle size and closest to the initial particle size among the preset particle sizes, perform linear interpolation on the grading points corresponding to the at least two particle sizes and the grading points corresponding to the initial particle size, obtain the target grading points corresponding to the target particle size, and determine the target grading curve based on the target grading points and each first grading point.

[0085] Exemplarily, for example, the preset particle sizes are 0.075 mm, 0.1 mm, 0.25 mm, 0.5 mm, 1 mm, 2 mm and 5 mm, respectively. For example, the particle size of the effective particle size of the target grading curve is determined to be 0.27 mm, that is, the initial particle size is 0.27 mm. For the convenience of calculation, the preset particle size and at least two particle sizes that are closest to the initial particle size can be determined as 0.25 mm and 0.1 mm according to the above-mentioned particle group. In this case, the grading points corresponding to at least two particle sizes and the grading points corresponding to the initial particle size can be determined, and then each grading point is linearly interpolated to obtain a target particle size of 0.25 mm for the target grading curve, and the fine particle content of the target grading curve at 0.25 mm is determined, and then the target grading point is determined according to the target particle size and the corresponding fine particle content. Finally, the target grading curve can be determined according to the target grading point and each first grading point.

[0086] S102: Adjusting multiple particle groups of the grading curve of the soil at the original site in a constant proportion to obtain multiple grading points of the target grading curve.

[0087] The computing device can adjust the multiple particle groups of the grading curve of the soil at the original site in a constant ratio to obtain multiple grading points of the target grading curve, and the multiple grading points obtained here can be called first grading points. The grading point of the effective particle size and the corresponding fine particle content can be called the second grading point.

[0088] For example, the soil body here is taken as an example with a fine particle content of 5%. Figure 4 As shown, Figure 4 The grading curve of the soil with a fine particle content of 5% (i.e., the grading curve of the original site) can be included, and the grading point corresponding to the 5mm particle size of the grading curve of the original site and the grading point of the particle size of 0.1mm and below are kept unchanged. The grading point corresponding to the effective particle size (here taking 0.27mm as an example) is determined, and the multiple particle groups (here taking 0.25-0.5mm, 0.5-1.0mm, and 1.0mm-2.0mm three particle groups) of the grading curve of the soil in the original site are adjusted proportionally, so as to determine the first grading points corresponding to 0.5mm, 1mm and 2mm of the target grading curve respectively.

[0089] S103: Determine the target gradation curve according to the fine particle content of the target gradation curve at the effective particle size and each gradation point.

[0090] According to the above steps, the computing device can determine multiple grading points (which may include a first grading point and a second grading point), and then the computing device can determine a target grading curve (for example, Figure 4 (shown in the experimental coral soil gradation curve)

[0091] In some possible implementations, the first permeability coefficient of the soil corresponding to the target gradation curve needs to be kept within a certain error range with the second permeability coefficient of the soil at the in-situ engineering site, that is, if the error between the first permeability coefficient and the second permeability coefficient is less than or equal to the error threshold. To reflect the liquefaction dynamic characteristics of the engineering in-situ site. For example, the error between the first permeability coefficient of the soil corresponding to the target gradation curve and the second permeability coefficient of the soil at the in-situ engineering site needs to be less than or equal to 2.0×10-2cm / s. If the error between the first permeability coefficient and the second permeability coefficient is less than or equal to the error threshold, the target gradation curve is determined to be qualified.

[0092] If the error between the first permeability coefficient and the second permeability coefficient is greater than the error threshold, it is determined that the target gradation curve is unqualified. If the target gradation curve is unqualified and the first permeability coefficient is greater than the second permeability coefficient, the particle size of the effective particle size is reduced according to the preset adjustment rule. If the target gradation curve is unqualified and the first permeability coefficient is less than the second permeability coefficient, the particle size of the effective particle size is increased according to the preset adjustment rule. For example, increase or decrease by 0.01 mm each time, and then re-execute step S102 and step S103, and determine the adjusted target gradation curve according to the fine particle content of the effective particle size after reducing or increasing the particle size and each determined gradation point, until the error between the first permeability coefficient and the second permeability coefficient of the target gradation curve is less than or equal to the error threshold.

[0093] In the embodiment of the present application, the fitting curve of the permeability coefficient and the effective particle size of the soil can be determined, the fine particle content of the target gradation curve at the effective particle size can be determined according to the fitting curve, the multiple particle groups of the gradation curve of the soil at the in-situ engineering site are adjusted in a constant ratio to obtain multiple gradation points of the target gradation curve, and the target gradation curve is determined according to the fine particle content of the target gradation curve at the effective particle size and each gradation point. In the present application, the fine particle content of the target gradation curve at the effective particle size can be determined according to the fitting curve, and then the second gradation point can be determined according to the effective particle size target particle size and the corresponding fine particle content, and the multiple particle groups of the gradation curve of the soil at the in-situ engineering site are adjusted in a constant ratio to obtain multiple second gradation points of the target gradation curve, so that the target gradation curve of the soil can be determined according to the first gradation point and the second gradation point, so as to realize the gradation design of the test soil after elimination.

[0094] The above are some specific implementations of the method for determining the gradation curve of wide-graded soil provided in the embodiments of the present application. Based on this, the present application also provides a corresponding device. The device provided in the embodiments of the present application will be introduced from the perspective of functional modularization. The device and the method for determining the gradation curve of wide-graded soil described above can be referred to each other.

[0095] Figure 5 The structural block diagram of the device for determining the gradation curve of wide-graded soil provided by the embodiment of the present invention is referred to as the specific implementation mode 2, and the reference Figure 5 The device may include:

[0096] The first determination unit 500 is used to determine a fitting curve between the permeability coefficient of the soil and the effective particle size, and determine the fine particle content of the target gradation curve at the effective particle size according to the fitting curve;

[0097] A first adjustment unit 510 is used to adjust the multiple particle groups of the gradation curve of the soil body at the in-situ engineering site in a proportionally unchanged manner to obtain multiple gradation points of the target gradation curve;

[0098] The second determination unit 520 is used to determine the target gradation curve according to the fine particle content of the target gradation curve at the effective particle size and each gradation point.

[0099] Optionally, each of the plurality of grading points is a first grading point, and the second determining unit is specifically configured to:

[0100] Determine an initial particle size of an effective particle size and a particle size that is closest to the initial particle size among the preset particle sizes;

[0101] Determine the particle size closest to the initial size as the target particle size of the effective particle size;

[0102] Determine a second grading point of the target grading curve according to the target particle size of the effective particle size and the fine particle content under the target particle size of the effective particle size;

[0103] The target grading curve is determined according to the second grading point and each first grading point.

[0104] Optionally, each of the plurality of grading points is a first grading point, and the second determining unit is specifically configured to:

[0105] Determine an initial particle size of an effective particle size and at least two particle sizes smaller than the initial particle size that are closest to the initial particle size among the preset particle sizes;

[0106] Performing linear interpolation on the gradation points corresponding to the at least two particle sizes and the gradation point corresponding to the initial particle size to obtain a target gradation point corresponding to the target particle size;

[0107] The target gradation curve is determined according to the target gradation point and each of the first gradation points.

[0108] Optionally, the first determining unit is specifically configured to:

[0109] Obtain the permeability parameters of soil at different fine particle contents and the particle size of effective particle size;

[0110] The fitting curve is determined by fitting the permeability parameters at different fine particle contents and the corresponding effective particle sizes.

[0111] Optionally, the device further comprises:

[0112] An acquisition unit, used for acquiring a first permeability coefficient of the soil corresponding to the target gradation curve;

[0113] The third determination unit is used to determine that the target gradation curve is qualified if the error between the first permeability coefficient and the second permeability coefficient of the soil at the in-situ engineering site is less than or equal to an error threshold.

[0114] Optionally, the device further comprises:

[0115] a fourth determining unit, configured to determine that the target grading curve is unqualified if an error between the first permeability coefficient and the second permeability coefficient is greater than an error threshold;

[0116] A second adjustment unit, configured to reduce the particle size of the effective particle size according to a preset adjustment rule if the target gradation curve is unqualified and the first permeability coefficient is greater than the second permeability coefficient, and to increase the particle size of the effective particle size according to a preset adjustment rule if the target gradation curve is unqualified and the first permeability coefficient is less than the second permeability coefficient;

[0117] The fifth determining unit is used to determine the adjusted target gradation curve according to the fine particle content of the effective particle size after the particle size is reduced or increased and each gradation point.

[0118] The embodiments of the present application also provide corresponding devices and computer storage media for implementing the solutions provided by the embodiments of the present application.

[0119] The device includes a memory and a processor, the memory is used to store instructions or codes, and the processor is used to execute the instructions or codes so that the device executes the method described in any embodiment of the present application.

[0120] The computer storage medium stores codes, and when the codes are executed, a device executing the codes implements the method described in any embodiment of the present application.

[0121] The "first" and "second" in the names such as "first" and "second" (if any) mentioned in the embodiments of the present application are only used as name identifiers and do not represent the first or second in order.

[0122] Through the description of the above implementation methods, it can be known that those skilled in the art can clearly understand that all or part of the steps in the above-mentioned embodiment method can be implemented by means of software plus a general hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a storage medium, such as a read-only memory (ROM) / RAM, a magnetic disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network communication device such as a router) to execute the methods described in each embodiment of the present application or some parts of the embodiments.

[0123] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0124] The above description is merely an exemplary embodiment of the present application and is not intended to limit the protection scope of the present application.

Claims

1. A method for determining a gradation curve of wide-graded soil, characterized in that: include: Determine a fitting curve of the permeability coefficient of the soil and the effective particle size, and determine the fine particle content of the target gradation curve at the effective particle size according to the fitting curve; Adjusting multiple particle groups of the gradation curve of the soil at the in-situ engineering site in a constant ratio to obtain multiple gradation points of the target gradation curve; The target gradation curve is determined according to the fine particle content of the target gradation curve at the effective particle size and each gradation point.

2. The method according to claim 1, characterized in that Each of the plurality of gradation points is a first gradation point, and determining the target gradation curve according to the fine particle content of the target gradation curve at an effective particle size and each gradation point comprises: Determine an initial particle size of an effective particle size and a particle size that is closest to the initial particle size among the preset particle sizes; Determine the particle size closest to the initial size as the target particle size of the effective particle size; Determine a second grading point of the target grading curve according to the target particle size of the effective particle size and the fine particle content under the target particle size of the effective particle size; The target grading curve is determined according to the second grading point and each first grading point.

3. The method according to claim 1, characterized in that Each of the plurality of gradation points is a first gradation point, and determining the target gradation curve according to the fine particle content of the target gradation curve at an effective particle size and each gradation point comprises: Determine an initial particle size of an effective particle size and at least two particle sizes smaller than the initial particle size that are closest to the initial particle size among the preset particle sizes; Performing linear interpolation on the gradation points corresponding to the at least two particle sizes and the gradation point corresponding to the initial particle size to obtain a target gradation point corresponding to the target particle size; The target gradation curve is determined according to the target gradation point and each of the first gradation points.

4. The method according to claim 1, characterized in that: The fitting curve is determined by: Obtain the permeability parameters of soil at different fine particle contents and the particle size of effective particle size; The fitting curve is determined by fitting the permeability parameters at different fine particle contents and the corresponding effective particle sizes.

5. The method according to claim 1, characterized in that: The method further comprises: Obtaining a first permeability coefficient of the soil corresponding to the target gradation curve; If the error between the first permeability coefficient and the second permeability coefficient of the soil at the in-situ engineering site is less than or equal to an error threshold, it is determined that the target gradation curve is qualified.

6. The method according to claim 5, characterized in that The method further comprises: If the error between the first permeability coefficient and the second permeability coefficient is greater than an error threshold, determining that the target gradation curve is unqualified; If the target gradation curve is unqualified and the first permeability coefficient is greater than the second permeability coefficient, the particle size of the effective particle size is reduced according to a preset adjustment rule; if the target gradation curve is unqualified and the first permeability coefficient is less than the second permeability coefficient, the particle size of the effective particle size is increased according to a preset adjustment rule; The adjusted target gradation curve is determined according to the fine particle content of the effective particle size after reducing or increasing the particle size and each gradation point.

7. A device for determining a gradation curve of wide-graded soil, characterized in that: include: A first determination unit is used to determine a fitting curve between the permeability coefficient of the soil and the effective particle size, and determine the fine particle content of the target gradation curve at the effective particle size according to the fitting curve; A first adjustment unit is used to adjust the multiple particle groups of the gradation curve of the soil body at the in-situ engineering site in a proportional manner to obtain multiple gradation points of the target gradation curve; The second determining unit is used to determine the target gradation curve according to the fine particle content of the target gradation curve at an effective particle size and each gradation point.

8. The device according to claim 7, characterized in that Each of the plurality of gradation points is a first gradation point, and the second determining unit is specifically configured to: Determine an initial particle size of an effective particle size and a particle size that is closest to the initial particle size among the preset particle sizes; Determine the particle size closest to the initial size as the target particle size of the effective particle size; Determine a second grading point of the target grading curve according to the target particle size of the effective particle size and the fine particle content under the target particle size of the effective particle size; The target grading curve is determined according to the second grading point and each first grading point.

9. The device according to claim 7, characterized in that Each of the plurality of gradation points is a first gradation point, and the second determining unit is specifically configured to: Each of the plurality of gradation points is a first gradation point, and the second determining unit is specifically configured to: Determine an initial particle size of an effective particle size and at least two particle sizes smaller than the initial particle size that are closest to the initial particle size among the preset particle sizes; Performing linear interpolation on the gradation points corresponding to the at least two particle sizes and the gradation point corresponding to the initial particle size to obtain a target gradation point corresponding to the target particle size; The target gradation curve is determined according to the target gradation point and each of the first gradation points.

10. The device according to claim 7, characterized in that The first determining unit is specifically used for: Obtain the permeability parameters of soil at different fine particle contents and the particle size of effective particle size; The fitting curve is determined by fitting the permeability parameters at different fine particle contents and the corresponding effective particle sizes.

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