A rapid soil classification and identification method and system based on electromagnetic wave velocity

Abstract

This disclosure provides a method and system for rapid soil classification and identification based on electromagnetic wave velocity, comprising: acquiring the electromagnetic wave velocity and moisture content of the soil to be tested; constructing point coordinates based on the electromagnetic wave velocity and moisture content; and obtaining the region where the point coordinates are located according to a pre-constructed regional division model; wherein, the construction of the regional division model specifically involves: acquiring electromagnetic wave velocity sample data of different types of soil at different moisture contents; obtaining boundary control points between different types of soil by interpolating adjacent soil sample data of different types, and obtaining regional boundary lines by fitting the boundary control points; constructing the regional division model based on the obtained regional boundary lines; and obtaining the soil category to be tested based on the obtained region, thereby achieving rapid soil classification and identification.

Description

Technical Field

[0001] This disclosure belongs to the field of geotechnical engineering investigation technology, and in particular relates to a method and system for rapid soil classification and identification based on electromagnetic wave velocity. Background Technology

[0002] The statements in this section are merely background information relating to this disclosure and do not necessarily constitute prior art.

[0003] In the field of geotechnical engineering, it is essential to determine the soil type of the area to be constructed before construction (because different soil types require different construction techniques or equipment). Therefore, rapid and accurate identification of soil type is crucial. The inventors discovered that the existing method involves collecting soil samples on-site and conducting manual particle analysis tests (generally using sieve analysis, densitometer method, or pipette method) to obtain the content of particles of different sizes. The soil type is then determined based on the content, which is time-consuming and labor-intensive and cannot meet the needs of rapid and accurate on-site measurement. Summary of the Invention

[0004] To address the aforementioned issues, this disclosure provides a method and system for rapid soil classification and identification based on electromagnetic wave velocity. The scheme constructs a regional division model of different soils in a two-dimensional plane of moisture content and electromagnetic wave velocity. Soil category can be obtained simply by acquiring the moisture content and electromagnetic wave velocity of the soil to be tested, effectively ensuring the speed and accuracy of soil identification. This effectively meets the needs of engineering surveying for rapid and accurate on-site determination of soil category.

[0005] According to a first aspect of the embodiments of this disclosure, a method for rapid soil classification and identification based on electromagnetic wave velocity is provided, comprising:

[0006] To obtain the electromagnetic wave velocity and moisture content of the soil to be tested;

[0007] Based on the electromagnetic wave velocity and water content, point coordinates are constructed. According to the pre-constructed regional division model, the region where the point coordinates are located is obtained. Specifically, the construction of the regional division model involves: acquiring electromagnetic wave velocity sample data of different types of soil at different water contents; obtaining the boundary control points between different types of soil by interpolating adjacent soil sample data; and obtaining the regional boundary line by fitting the boundary control points. The regional division model is then constructed based on the obtained regional boundary line.

[0008] Based on the obtained location, the soil type to be tested is determined, enabling rapid soil classification and identification.

[0009] Furthermore, the acquisition of electromagnetic wave velocity sample data of different types of soil at different moisture contents specifically involves: collecting different types of soil in advance, drying them, and then preparing soil samples with preset different moisture contents; using ground-penetrating radar to measure the electromagnetic wave velocity of different soil samples to obtain sample data.

[0010] Furthermore, the method of interpolating adjacent soil sample data of different types to obtain the boundary control points between different soil types specifically involves: using water content and its corresponding electromagnetic wave velocity as data points, interpolating adjacent clay and silt data points to obtain the boundary control points between clay and silt; simultaneously, interpolating adjacent silt and sand data points to obtain the boundary control points between silt and sand.

[0011] Furthermore, the process of obtaining the region boundary line by fitting the boundary control points specifically involves:

[0012] Based on the obtained control points for the boundary between clay and silt, the regional boundary line between clay and silt is fitted; at the same time, based on the obtained control points for the boundary between silt and sand, the regional boundary line between silt and sand is fitted; the first quadrant of the rectangular coordinate system is divided into three regions by the two regional boundary lines, each region corresponding to a soil type.

[0013] Furthermore, based on the obtained location, the soil type to be tested is determined, specifically:

[0014] When the coordinates of the soil sample are below the boundary between silt and sand, it is considered sandy soil.

[0015] When the coordinates of the soil sample to be tested are above the boundary line between silt and sand, and below the boundary line between clay and silt, it is considered silt.

[0016] When the coordinates of the soil sample are above the boundary between clay and silt, it is considered clay.

[0017] According to a second aspect of the present disclosure, a rapid soil classification and identification system based on electromagnetic wave velocity is provided, comprising:

[0018] The data acquisition unit is used to acquire the electromagnetic wave velocity and moisture content of the soil to be tested.

[0019] A region division unit is used to construct point coordinates based on the electromagnetic wave velocity and water content, and to obtain the region where the point coordinates are located according to a pre-constructed region division model. Specifically, the construction of the region division model involves: acquiring electromagnetic wave velocity sample data of different types of soil at different water contents; obtaining boundary control points between different types of soil by interpolating adjacent soil sample data; fitting the boundary control points to obtain the regional boundary line; and constructing the region division model based on the obtained regional boundary line.

[0020] The classification and identification unit is used to obtain the soil category to be tested based on the obtained location, so as to achieve rapid classification and identification of soil.

[0021] According to a third aspect of the present disclosure, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and running on the memory, wherein the processor executes the program to implement the aforementioned method for rapid soil classification and identification based on electromagnetic wave velocity.

[0022] According to a fourth aspect of the present disclosure, a non-transitory computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the aforementioned method for rapid soil classification and identification based on electromagnetic wave velocity.

[0023] Compared with the prior art, the beneficial effects of this disclosure are:

[0024] This disclosure provides a method and system for rapid soil classification and identification based on electromagnetic wave velocity. The scheme constructs a regional division model of different soils in a two-dimensional plane of water content and electromagnetic wave velocity. Soil category can be obtained by only obtaining the water content and electromagnetic wave velocity of the soil to be tested, which effectively ensures the speed and accuracy of soil identification and can effectively meet the needs of engineering survey field for rapid and accurate on-site determination of soil category.

[0025] Advantages of this disclosure in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0026] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure.

[0027] Figure 1 This is a map showing the location distribution of clay, silt, and sand samples (moisture content and electromagnetic wave velocity) as described in the embodiments of this disclosure.

[0028] Figure 2This is a schematic diagram of the water content-electromagnetic wave velocity plane boundary line as described in the embodiments of this disclosure;

[0029] Figure 3 This is a flowchart of a rapid soil classification and identification method based on electromagnetic wave velocity as described in an embodiment of this disclosure. Detailed Implementation

[0030] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0031] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] Where there is no conflict, the embodiments and features described herein can be combined with each other.

[0034] Terminology Explanation:

[0035] Ground Penetrating Radar (GPR) is a geophysical method that uses high-frequency radio waves to determine the distribution patterns of a medium. Specifically, it uses a ground penetrating radar transmitting antenna to emit high-frequency pulsed electromagnetic waves into the ground, and a receiving antenna to receive the reflected electromagnetic waves from the target object, thus detecting the distribution characteristics of the target object.

[0036] Particle analysis: Generally, sieve analysis, hydrometer analysis, and pipette analysis are used to obtain the content of particles of different sizes, and soil samples are classified and named according to industry standards.

[0037] Example 1:

[0038] The purpose of this embodiment is to provide a rapid soil classification and identification method based on electromagnetic wave velocity.

[0039] A rapid soil classification and identification method based on electromagnetic wave velocity includes:

[0040] To obtain the electromagnetic wave velocity and moisture content of the soil to be tested;

[0041] Based on the electromagnetic wave velocity and water content, point coordinates are constructed. According to the pre-constructed regional division model, the region where the point coordinates are located is obtained. Specifically, the construction of the regional division model involves: acquiring electromagnetic wave velocity sample data of different types of soil at different water contents; obtaining the boundary control points between different types of soil by interpolating adjacent soil sample data; and obtaining the regional boundary line by fitting the boundary control points. The regional division model is then constructed based on the obtained regional boundary line.

[0042] Based on the obtained location, the soil type to be tested is determined, enabling rapid soil classification and identification.

[0043] Furthermore, the acquisition of electromagnetic wave velocity sample data of different types of soil at different moisture contents specifically involves: collecting different types of soil in advance, drying them, and then preparing soil samples with preset different moisture contents; using ground-penetrating radar to measure the electromagnetic wave velocity of different soil samples to obtain sample data.

[0044] Furthermore, the method of interpolating adjacent soil sample data of different types to obtain the boundary control points between different soil types specifically involves: using water content and its corresponding electromagnetic wave velocity as data points, interpolating adjacent clay and silt data points to obtain the boundary control points between clay and silt; simultaneously, interpolating adjacent silt and sand data points to obtain the boundary control points between silt and sand.

[0045] Furthermore, the process of obtaining the region boundary line by fitting the boundary control points specifically involves:

[0046] Based on the obtained control points for the boundary between clay and silt, the regional boundary line between clay and silt is fitted; at the same time, based on the obtained control points for the boundary between silt and sand, the regional boundary line between silt and sand is fitted; the first quadrant of the rectangular coordinate system is divided into three regions by the two regional boundary lines, each region corresponding to a soil type.

[0047] Furthermore, based on the obtained location, the soil type to be tested is determined, specifically:

[0048] When the coordinates of the soil sample are below the boundary between silt and sand, it is considered sandy soil.

[0049] When the coordinates of the soil sample to be tested are above the boundary line between silt and sand, and below the boundary line between clay and silt, it is considered silt.

[0050] When the coordinates of the soil sample are above the boundary between clay and silt, it is considered clay.

[0051] Furthermore, the different types of soil include clay, silt, and sand.

[0052] Specifically, for ease of understanding, the following detailed explanation of the solution described in this embodiment is provided with specific examples:

[0053] To address the problems of existing technologies, this embodiment provides a rapid soil classification and identification method based on electromagnetic wave velocity. This method classifies and names soils according to their moisture content and electromagnetic wave velocity, particularly distinguishing between sandy soil, silt, and clay. The main technical concept is as follows: Samples of clay, silt, and sand are collected and prepared with different moisture contents. The electromagnetic wave velocity of the samples is then measured. Based on the distribution pattern of the (moisture content, electromagnetic wave velocity) points of the three soil types, the boundary lines between clay and silt, and between silt and sand, are obtained within the moisture content-electromagnetic wave velocity plane. These two boundary lines divide the moisture content-electromagnetic wave velocity plane into three regions, corresponding to sandy soil, silt, and clay, respectively. If the soil's (moisture content, electromagnetic wave velocity) point distribution is located in the sandy soil region below the silt-sand boundary line, the soil is sandy soil; if it is located between the two boundary lines, the soil is silt; and if it is located above the clay-silt boundary line, the soil is clay. Specifically:

[0054] The method described in this embodiment first involves collecting disturbed samples of clay, silt, and sand in the field, and then pre-treating the samples. The pre-treatment includes drying the three types of original soil samples, and then sieving the silt and sand using a 2mm coarse sieve to remove larger particles. The clay is then pulverized. Particle size analysis is then performed on the three types of soil samples, and the results are shown in Table 1. The treated soil samples are then placed in a dryer for further drying.

[0055] Furthermore, the particle analysis specifically employs sieving, hydrometer, and pipette methods to obtain the content of particles of different sizes, and classifies and names the soil samples according to industry standards for clay, silt, and sand.

[0056] Table 1. Particle size analysis results of clay, silt, and sand.

[0057] Particle size (mm) 20～2 2～0.5 0.5～0.25 0.25～0.075 <0.075 Clay particle composition percentage 1.10％ 5.13％ 8.37％ 8.07％ 77.33％ Percentage of sand particles 6.84％ 11.26％ 10.50％ 61.02％ 10.38％ Percentage of silt particles 0 0 2.37％ 2.70％ 94.93％

[0058] Different masses of water were added to the dried soil samples to prepare soil samples with different moisture contents. The prepared soil samples were poured into a mold frame, compacted, sealed, and left to stand. Then, ground-penetrating radar was used to measure the electromagnetic wave velocity of the soil samples with different moisture contents (using a standard volume container for easy calculation), as shown in Tables 2, 3, and 4.

[0059] Furthermore, the electromagnetic wave velocity is measured using a high-frequency antenna on a standard sample. The electromagnetic wave velocity of the soil is calculated based on the sample volume and the ground-penetrating radar measurement time. The specific formula is:

[0060]

[0061] Where v is the electromagnetic wave velocity of the soil (m / ns), h is the sample thickness (m), and t is the measured radar wave propagation time (ns).

[0062] Table 2. Moisture content of clay and electromagnetic wave velocity

[0063]

[0064] Table 3. Moisture content of silt and electromagnetic wave velocity

[0065]

[0066] Table 4. Moisture content of sandy soil and electromagnetic wave velocity

[0067]

[0068] Based on the results in Tables 2, 3, and 4, a distribution map of soil samples (moisture content, electromagnetic wave velocity) was drawn, as shown below. Figure 1 As shown.

[0069] Interpolating adjacent clay and silt points yields the control points defining the boundary between clay and silt. Connecting all control points sequentially and extending appropriately at both ends creates the boundary line between clay and silt. The boundary line between silt and sand can be obtained using the same method.

[0070] These two dividing lines divide the moisture content-electromagnetic wave velocity plane into three regions: the area below the silt-sand boundary is the sandy region, the area above the clay-silt boundary is the clay region, and the area between the two boundaries is the silt region. (See details below.) Figure 2 As shown.

[0071] Example 2:

[0072] The purpose of this embodiment is to provide a rapid soil classification and identification system based on electromagnetic wave velocity.

[0073] A rapid soil classification and identification system based on electromagnetic wave velocity includes:

[0074] The data acquisition unit is used to acquire the electromagnetic wave velocity and moisture content of the soil to be tested.

[0075] A region division unit is used to construct point coordinates based on the electromagnetic wave velocity and water content, and to obtain the region where the point coordinates are located according to a pre-constructed region division model. Specifically, the construction of the region division model involves: acquiring electromagnetic wave velocity sample data of different types of soil at different water contents; obtaining boundary control points between different types of soil by interpolating adjacent soil sample data; fitting the boundary control points to obtain the regional boundary line; and constructing the region division model based on the obtained regional boundary line.

[0076] The classification and identification unit is used to obtain the soil category to be tested based on the obtained location, so as to achieve rapid classification and identification of soil.

[0077] Furthermore, the system described in this embodiment corresponds to the method described in Embodiment 1, and its technical details have been described in detail in Embodiment 1, so they will not be repeated here.

[0078] In further embodiments, the following is also provided:

[0079] An electronic device includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor. When executed by the processor, the computer instructions perform the method described in Embodiment 1. For brevity, further details are omitted here.

[0080] It should be understood that in this embodiment, the processor can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc.

[0081] Memory may include read-only memory and random access memory, and provides instructions and data to the processor. A portion of memory may also include non-volatile random access memory. For example, memory may also store information about the device type.

[0082] A computer-readable storage medium for storing computer instructions, which, when executed by a processor, perform the method described in Embodiment 1.

[0083] The method in Embodiment 1 can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor. The software modules can reside in readily available storage media in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory; the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, a detailed description is not provided here.

[0084] Those skilled in the art will recognize that the units, i.e., algorithm steps, of the various examples described in connection with this embodiment can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0085] The above embodiments provide a method and system for rapid soil classification and identification based on electromagnetic wave velocity, which can be implemented and has broad application prospects.

[0086] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A rapid soil classification and identification method based on electromagnetic wave velocity, characterized in that, include: To obtain the electromagnetic wave velocity and moisture content of the soil to be tested; Based on the electromagnetic wave velocity and water content, point coordinates are constructed. According to a pre-constructed regional division model, the region where the point coordinates are located is obtained. Specifically, the regional division model is constructed by: acquiring electromagnetic wave velocity sample data for different soil types at different water contents; and interpolating adjacent soil sample data to obtain boundary control points between different soil types. Specifically, using water content and its corresponding electromagnetic wave velocity as data points, adjacent clay and silt data points are interpolated to obtain boundary control points between clay and silt; simultaneously, adjacent silt and sand data points are interpolated to obtain boundary control points between silt and sand. The regional boundary lines are obtained by fitting the boundary control points. Based on the obtained regional boundary lines, the regional division model is constructed. Specifically, based on the obtained boundary control points of clay and silt, the regional boundary lines of clay and silt are fitted; at the same time, based on the obtained boundary control points of silt and sand, the regional boundary lines of silt and sand are fitted; the first quadrant of the rectangular coordinate system is divided into three regions by the two regional boundary lines, and each region corresponds to a soil type. Based on the obtained location, the soil type is determined, enabling rapid soil classification and identification. Specifically: when the coordinates of the soil point are below the boundary between silt and sand, it is sand; when the coordinates of the soil point are above the boundary between silt and sand but below the boundary between clay and silt, it is silt; and when the coordinates of the soil point are above the boundary between clay and silt, it is clay.

2. The method for rapid soil classification and identification based on electromagnetic wave velocity as described in claim 1, characterized in that, The process of obtaining electromagnetic wave velocity sample data for different types of soil at different moisture contents involves: collecting different types of soil in advance, drying them, and then preparing soil samples with preset moisture contents; using ground-penetrating radar to measure the electromagnetic wave velocity of different soil samples to obtain sample data.

3. The method for rapid soil classification and identification based on electromagnetic wave velocity as described in claim 1, characterized in that, The different types of soil include clay, silt, and sand.

4. A rapid soil classification and identification system based on electromagnetic wave velocity, employing the rapid soil classification and identification method based on electromagnetic wave velocity as described in any one of claims 1-3, characterized in that, include: The data acquisition unit is used to acquire the electromagnetic wave velocity and moisture content of the soil to be tested. A region division unit is used to construct point coordinates based on the electromagnetic wave velocity and water content, and to obtain the region where the point coordinates are located according to a pre-constructed region division model. Specifically, the construction of the region division model involves: acquiring electromagnetic wave velocity sample data of different types of soil at different water contents; obtaining boundary control points between different types of soil by interpolating adjacent soil sample data; fitting the boundary control points to obtain the regional boundary line; and constructing the region division model based on the obtained regional boundary line. The classification and identification unit is used to obtain the soil category to be tested based on the obtained location, so as to achieve rapid classification and identification of soil.

5. The rapid soil classification and identification system based on electromagnetic wave velocity as described in claim 4, characterized in that, The method involves interpolating adjacent soil sample data of different types to obtain boundary control points between different soil types. Specifically, using water content and its corresponding electromagnetic wave velocity as data points, adjacent clay and silt data points are interpolated to obtain boundary control points between clay and silt; at the same time, adjacent silt and sand data points are interpolated to obtain boundary control points between silt and sand.

6. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and running thereon, characterized in that, When the processor executes the program, it implements a rapid soil classification and identification method based on electromagnetic wave velocity as described in any one of claims 1-3.

7. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements a rapid soil classification and identification method based on electromagnetic wave velocity as described in any one of claims 1-3.

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