CN115656481B - Method and system for representing water holding capacity of soil microstructure - Google Patents
Method and system for representing water holding capacity of soil microstructure Download PDFInfo
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Abstract
The invention relates to the fields of geotechnical engineering and soil mechanics, in particular to a method and a system for characterizing the water holding capacity of a soil microstructure. The method for characterizing the water holding capacity of the soil microstructure provided by the invention realizes the crossing of the soil sample to be tested from macroscopic analysis to microscopic analysis by acquiring the microscopic morphology of the soil sample to be tested and carrying out qualitative and quantitative analysis on the microscopic morphology, and obtains a soil saturation-adsorption force relation curve of the soil microstructure, wherein the soil saturation-adsorption force relation curve of the soil microstructure is an accurate representation of the water holding capacity of the soil in the microscopic aspect, and has the advantages of small error and short measurement time. Meanwhile, aiming at the micro aggregates with high expansibility such as bentonite and the like, a saturation-adsorption force relation curve for representing the water retention characteristic of the micro aggregates can be obtained through the method, so that the method is beneficial to the analysis work of the adsorbability and the mechanical property of the bentonite, and provides accurate data reference for designing and selecting barrier material parameters such as nuclear waste and the like.
Description
Technical Field
The invention relates to the fields of geotechnical engineering and soil mechanics, in particular to a method and a system for characterizing the water holding capacity of a soil microstructure.
Background
The saturation-adsorption force relation curve of the soil microstructure is a mode for representing the water holding capacity of the soil microstructure, is one of basic physical indexes of soil, is closely related to the skeleton property, the pore structure, mineral components in the soil and the like of the soil, is one of important indexes for measuring the adsorption capacity of the soil, and has important application in the field of soil mechanics. For example, the adsorbability of bentonite in a high radioactive nuclear waste disposal warehouse influences the migration and safety of the high radioactive nuclear waste, and the correct determination of the value of the bentonite has important significance on the design and selection of barrier material parameters such as nuclear waste and the like. However, because the size of the bentonite particles is in the micron (mum) level, at present, an accurate experimental means is not available for testing a method for testing a micro saturation-adsorption force relation curve of the soil particles, and the method is mostly macroscopic experimental data of the whole soil. Meanwhile, the existing experimental test method for the saturation-adsorption force relation curve of the soil body aims at the whole body of a certain soil body sample, the method needs longer test time for clay, and has larger random error, for example, the test method for testing the volume of high-expansibility clay such as bentonite (such as a wax sealing method) has larger test error, the process is more complicated, and additional equipment and materials are needed.
Disclosure of Invention
Aiming at the defects of the prior art and the requirements of practical application, the invention provides a soil microstructure water holding capacity characterization method in a first aspect, which comprises the following steps: providing a soil body sample to be detected; measuring the micro-morphology, the water content and the soil adsorption capacity of the soil sample to be measured under different relative humidities; according to the micro morphology, obtaining the morphological volume of single soil particles in the soil body sample to be detected under different relative humidity; obtaining the saturation of the single soil particles under different relative humidity by using the water content and the morphological volume; summarizing data of soil body adsorption force and saturation corresponding to the same soil particles under different relative humidity; and obtaining a soil saturation-adsorption force relation curve through a plurality of groups of data, and representing the soil microstructure water holding capacity of the soil sample to be detected by using the soil saturation-adsorption force relation curve. The method for characterizing the water holding capacity of the soil microstructure provided by the invention realizes the crossing of the macroscopic analysis to the microscopic analysis of the soil sample to be tested by acquiring the microscopic morphology of the soil sample to be tested and carrying out qualitative and quantitative analysis on the microscopic morphology, and obtains the real soil saturation-adsorption force relation curve of the soil microstructure, wherein the soil saturation-adsorption force relation curve of the soil microstructure is an accurate representation of the water holding capacity of the soil in the microscopic aspect, and has the advantages of small error, short measurement time and wide application range. Meanwhile, aiming at the micro aggregates with high expansibility such as bentonite and the like, a saturation-adsorption force relation curve for representing the water retention characteristic of the micro aggregates can be obtained through the method, so that the method is beneficial to the analysis work of the adsorbability and the mechanical property of the bentonite, and provides accurate data reference for designing and selecting barrier material parameters such as nuclear waste and the like.
Optionally, the measuring the micro-topography of the soil sample to be measured under different relative humidities includes the following steps: providing an electron microscope, and placing a soil sample to be detected into a shooting environment of the electron microscope; fixing the shooting visual angle of the electron microscope, and adjusting the relative humidity of the shooting environment; and capturing the micro-topography images of a plurality of soil body samples to be detected by using the electron microscope under the shooting environments with different relative humidity. According to the invention, the specific multifunctional electron microscope is selected to obtain the micro-morphology of the soil body sample to be detected under different relative humidity, so that the precision of the micro-morphology is greatly improved, and meanwhile, the electron microscope is easy to operate, high in operation speed and clear and accurate in image.
Optionally, the method for measuring the water content and the soil adsorption capacity of the soil sample to be measured under different relative humidities comprises the following steps: fitting the functional relationship between water content and soil adsorption force
Wherein, in the process,
which represents the water content of the water,
representing the soil adsorption capacity; box for obtaining soil adsorption force and relative humidityNumerical relationship
Wherein, in the step (A),
represents relative humidity; binding function relationships
And functional relation
Obtaining a functional relationship between water content and relative humidity
(ii) a Using said functional relationship
The functional relationship
And the functional relationship
And obtaining the water content and the soil body adsorption capacity under different relative humidity. The invention directly constructs the functional relation between the soil body adsorption force and the relative humidity
And water content as a function of relative humidity
The method has the advantages that the corresponding soil body adsorption capacity and water content can be obtained only by knowing the relative humidity, complex experimental measurement on the soil body sample to be tested is not needed, the testing time is shortened, and the implementation efficiency of the whole method is improved.
Optionally, the obtaining the morphological volume of the single soil particle in the soil body sample to be detected under different relative humidities according to the micro-topography includes the following steps: selecting single soil particles with clear edges from the micro-topography maps of the soil samples to be detected; tracking the positions of the single soil particles in the micro-topography images of the rest soil body samples to be detected; and estimating the shape volume of the single soil particle in the micro-topography picture of each soil sample to be detected. According to the invention, through concentrating on a certain soil particle to carry out related data measurement and analysis, errors caused by subsequent measurement of morphological volumes obtained by different soil particles selected from micro-topography maps of different soil body samples to be measured are avoided, and meanwhile, the related data measurement and analysis are constantly carried out on a certain soil particle, so that the difficulty of measuring the solid volume in the soil particle in the subsequent step is reduced, and the mass and the volume of the same soil particle in different relative humidity environments in geotechnical mechanics are regarded as constant, so that the measurement is only needed once for the solid volume in the same soil particle, the test time is greatly shortened, and the implementation efficiency of the whole method is improved.
Optionally, the obtaining the saturation of the individual soil particles under different relative humidities by using the water content in combination with the form volume comprises the following steps: setting a relative humidity saturation threshold; classifying components of the morphology volume using the relative humidity saturation threshold; and according to the classification result and the physical property of the soil particle saturation, obtaining the saturation of the single soil particles under different relative humidities.
Optionally, the result of the classification includes a component classification model satisfying the following formula:
wherein, the first and the second end of the pipe are connected with each other,
represents the morphological volume of the soil particles,
which represents the volume of solids in the soil particles,
representing the volume of water and air in the soil particles,
which represents the volume of water in the soil particles,
which represents the volume of air in the soil particles,
which is indicative of the relative humidity of the water,
is representative of the relative humidity saturation threshold value,
indicating the saturation of the soil particles.
Optionally, the obtaining the saturation degree of the soil particles according to the classification result and the physical property of the saturation degree of the soil particles comprises the following steps: setting saturated relative humidity, and obtaining the saturated form volume of soil particles under the saturated relative humidity condition; classifying the components of the saturated form volume to obtain a saturated state soil particle component equation; characterizing the water content by using the classification result of the saturated form volume to obtain a water content characterization equation of the soil particles; combining the saturated state soil particle component equation and the water content characterization equation of the soil particles to obtain the solid volume in the soil particles; constructing a saturation model of the soil particles under any relative humidity by using the solid volume and the morphological volume of the soil particles and the physical property of the saturation of the soil particles; and obtaining the saturation of the single soil particles under different relative humidities through the saturation model.
Optionally, the saturated state soil particle composition equation and the water content characterization equation of the soil particles respectively satisfy the following formulas:
wherein the content of the first and second substances,
which represents the volume of the saturated morphology,
which represents the moisture content of the soil particles under saturated relative humidity conditions,
which represents the volume of solids in the soil particles,
which represents the volume of water in the soil particles,
which is indicative of the density of the water,
expressing the solid density, and the solid volume obtained by combining the saturated state soil particle component equation and the soil particle water content characterization equation satisfies the following formula:
。
optionally, the saturation model satisfies the following formula:
wherein, the first and the second end of the pipe are connected with each other,
to representThe degree of saturation is set to be,
which is indicative of the relative humidity of the water,
is indicative of a relative humidity saturation threshold value,
，
indicates a relative humidity of
Water content, R represents a molecular gas constant, T represents an absolute temperature,
which is indicative of the density of the water,
representing the molecular mass of water.
In a second aspect, the present invention further provides a soil microstructure water-holding capacity characterization system, where the soil microstructure water-holding capacity characterization system includes an input device, a processor, a memory, and an output device, where the input device, the processor, the memory, and the output device are connected to each other, where the memory is used to store a computer program, and the computer program includes program instructions, and the processor is configured to call the program instructions to execute the soil microstructure water-holding capacity characterization method according to the first aspect of the present invention. The soil microstructure water holding capacity characterization system provided by the invention has the advantages of compact structure, stable operation and strong expansibility, is beneficial to carrying out corresponding system reconstruction aiming at different soil samples to be detected, and ensures the stable execution of the soil microstructure water holding capacity characterization method while expanding the application range of the soil microstructure water holding capacity characterization system.
Drawings
FIG. 1 is a flow chart of a method for characterizing water holding capacity of a soil microstructure according to the present invention;
FIG. 2 is a micro-topography diagram of soil samples to be measured with different relative humidity under the same viewing angle in the embodiment of the invention;
FIG. 3 shows soil particles with clear edges selected from a micro-topography of a soil sample to be measured according to an embodiment of the present invention;
FIG. 4 is a soil saturation-adsorption force relationship curve of a soil microstructure of bentonite obtained in an embodiment of the present invention;
fig. 5 is a structural diagram of a soil microstructure water holding capacity characterization system of the invention.
Detailed Description
Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described herein are only for illustration and are not intended to limit the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known circuits, software, or methods have not been described in detail in order to avoid obscuring the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale.
Aiming at the defects of the method for obtaining the soil saturation-adsorption force relation curve of the soil microstructure in the prior art and the requirements of practical application, please refer to fig. 1, the invention provides a method for characterizing the water holding capacity of the soil microstructure, which comprises the following steps:
and S01, providing a soil body sample to be detected.
The soil body sample to be tested required by the invention is the soil body sample to be tested which needs to be subjected to water holding capacity research of the soil body microstructure. In the application field of nuclear engineering in the fields of geotechnical engineering and soil mechanics, the selection of rock mass ore materials for high radioactive nuclear waste disposal is very important, which is concerned with the migration and safety of high radioactive nuclear waste. Among them, bentonite, which is commonly used in the treatment of high-radioactive nuclear waste, is also very important for the research on the water absorption performance. In an optional embodiment, in order to research the water holding capacity of the bentonite microstructure, bentonite for high radioactive nuclear waste disposal is selected as a soil body sample to be tested, and the water holding capacity of the soil body microstructure of the bentonite soil body sample is characterized through the subsequent steps of the invention, so that accurate reference data is provided for the design and selection of barrier material parameters of nuclear waste and the like.
S02, measuring the micro-morphology, the water content and the soil adsorption capacity of the soil sample to be measured under different relative humidities.
In the soil microstructure water holding capacity characterization method provided by the invention, the step S02 of measuring the microstructure, the water content and the soil adsorption capacity of the soil sample to be measured under different relative humidities can respectively carry out measurement operation on three parameters of the microstructure, the water content and the soil adsorption capacity, and the three parameters in the prior art also have corresponding phase technologies, which are not specifically explained, but are respectively measured by actual experiments in the prior art, so that the method has the advantages of long experiment steps, long time consumption and large errors; it is also possible to combine two or three of these parameters together for the measurement operation. The micro-topography, water content and soil mass adsorption capacity data obtained under different measuring modes have the same relative humidity scale. In an alternative embodiment, the relative humidity is dimensioned
After the measurement operation of three parameters of the micro-morphology, the water content and the soil body adsorption force is respectively carried out, the relative humidity of the soil body is obtained
Corresponding micro-topography
Water content of
And the adsorption power of soil body
Relative humidity of
Corresponding micro-topography
Water content of
And the adsorption power of soil body
8230and a relative humidity of
Corresponding micro-topography
Water content of
And the adsorption power of soil body
。
In yet another alternative embodiment, the step S02 of measuring the soil mass to be measuredThe microscopic morphology of the sample under different relative humidities comprises the following steps: providing an electron microscope, and placing a soil body sample to be detected into a shooting environment of the electron microscope; fixing the shooting visual angle of the electron microscope, and adjusting the relative humidity of the shooting environment; and capturing the micro-topography images of a plurality of soil body samples to be detected by using the electron microscope under the shooting environments with different relative humidity. According to the invention, the specific multifunctional electron microscope is selected to obtain the micro-morphology of the soil body sample to be detected under different relative humidity, so that the precision of the micro-morphology is greatly improved, and meanwhile, the electron microscope is easy to operate, high in operation speed and clear and accurate in image. In a specific embodiment, the Electron Microscope used for measuring the micro-topography of the soil sample to be measured at different relative humidities is an Environmental Scanning Electron Microscope (ESEM), which can set different temperatures and water vapor pressures, so as to easily control the relative humidity of the measuring environment, as shown in fig. 2, where fig. 2 includes that the relative humidities at the same viewing angle are respectively the relative humidity
、
、
And
the microcosmic topography of the soil sample to be detected, wherein the soil sample to be detected is bentonite. Meanwhile, the recognition precision of the environment scanning electron microscope can reach the nanometer level, and the measurement precision of the water holding capacity characteristic of the micro soil particle aggregate composed of clay sheets in the bentonite sample waiting for measuring is greatly improved.
In still another alternative embodiment, the step S02 of measuring the water content and the soil adsorption capacity of the soil sample to be measured at different relative humidities includesThe method comprises the following steps: fitting the functional relationship between water content and soil adsorption force
Wherein, in the step (A),
which represents the water content of the water,
representing the soil adsorption capacity; obtaining the functional relation between the soil adsorption force and the relative humidity
Wherein, in the step (A),
represents relative humidity; binding function relationships
And functional relation
Obtaining a functional relationship between water content and relative humidity
(ii) a Using said functional relationship
The functional relationship
And the functional relationship
And obtaining the water content and the soil body adsorption capacity under different relative humidity. The invention directly constructs the functional relation between the soil body adsorption force and the relative humidity
And water content as a function of relative humidity
The method realizes that the corresponding soil body adsorption capacity and water content can be obtained only by knowing the relative humidity, does not need to perform complex experimental measurement on the soil body sample to be tested, shortens the testing time and improves the implementation efficiency of the whole method. In this embodiment, the function relationship between the water content and the soil adsorption force is fitted
The fitting data is obtained from the same soil mass of the soil mass sample to be measured, namely the soil mass sample to be measured is obtained at different relative humidity
Water content of
(ii) a Obtaining the same soil mass of the soil mass sample to be detected at different relative humidity
Absorption force of lower soil body
(ii) a By matching the same relative humidity
Corresponding water content
And the adsorption power of soil body
Obtaining multi-slice matching data
(ii) a By means of a webData of the recipe
Water content of fit
Adsorption force with soil body
Corresponding curve and corresponding functional relation
(ii) a And deducing and obtaining soil adsorption capacity by using Kelvin formula
Relative humidity
Functional relationship of
In particular, in this example, the soil mass adsorption capacity
Relative humidity
Functional relationship of
Wherein R represents a molecular gas constant,
t represents absolute temperature, T is in Kelvin,
represents the density of water;
represents the molecular mass of water
. When the relative humidity is known
I.e. by the functional relationship between the soil adsorption force and the relative humidity
And water content as a function of relative humidity
To obtain a corresponding water content
And the adsorption power of soil body
。
And S03, obtaining the shape volume of the single soil particles in the soil body sample to be detected under different relative humidity according to the micro-morphology.
In an optional embodiment, the step S03 of obtaining the morphological volume of the single soil particle in the soil sample to be detected under different relative humidities according to the micro-morphology includes the following steps: selecting single soil particles with clear edges from the micro-topography images of the soil body samples to be detected; tracking the positions of the single soil particles in the micro-topography images of the rest soil body samples to be detected; and estimating the shape volume of the single soil particle in the micro-topography map of each soil sample to be detected. In this embodiment, the micro-topography is a micro-topography image of the soil sample to be detected obtained by the environmental scanning electron microscope in the above embodiment, please refer to fig. 3, fig. 3 shows soil particles with clear edges selected from the micro-topography image of the soil sample to be detected, and in the figure, 20um is a scale of the image. According to the invention, through concentrating on a certain soil particle to carry out related data measurement and analysis, errors caused by subsequent measurement of morphological volumes obtained by different soil particles selected from micro-topography maps of different soil body samples to be measured are avoided, and meanwhile, the related data measurement and analysis are constantly carried out on a certain soil particle, so that the difficulty of measuring the solid volume in the soil particle in the subsequent step is reduced, and the mass and the volume of the same soil particle in different relative humidity environments in geotechnical mechanics are regarded as constant, so that the measurement is only needed once for the solid volume in the same soil particle, the test time is greatly shortened, and the implementation efficiency of the whole method is improved.
And S04, obtaining the saturation of the single soil particles under different relative humidities by combining the water content with the form volume.
The saturation of the soil particles refers to the ratio of the volume of water in the soil particles to the total volume of water and air, and when the saturation of any soil particle is 1, the corresponding soil particle has no air and is completely filled with water. Due to the limitation of the current experimental conditions, the observation of soil particles is difficult when the relative humidity is greater than a certain threshold value, on one hand, due to the high relative humidity, the lens is easy to blur; secondly, due to the high relative speed, namely the soil particles are easy to move rapidly in the high relative humidity environment, the soil particles can be approximately in a saturated state. Therefore, the step S04 of obtaining the saturation degree of the individual soil particles under different relative humidities by using the water content in combination with the morphological volume includes the following steps: setting a relative humidity saturation threshold; classifying components of the morphology volume using the relative humidity saturation threshold; and according to the classification result and the physical property of the soil particle saturation, obtaining the saturation of the single soil particles under different relative humidities.
In an alternative embodiment, the result of the classification in step S04 includes a component classification model satisfying the following formula:
wherein the content of the first and second substances,
represents the morphological volume of the soil particles,
which represents the volume of solids in the soil particles,
representing the volume of water and air in the soil particles,
which represents the volume of water in the soil particles,
which represents the volume of air in the soil particles,
which is indicative of the relative humidity of the water,
is indicative of a relative humidity saturation threshold value,
indicating the saturation of the soil particles. In another specific embodiment, the soil sample to be tested is bentonite, and due to the limitation of experimental conditions, the soil sample to be tested is bentonite
The soil particles of bentonite are difficult to observe. Thus the relative humidity threshold
Set to 95%, the above-mentioned composition classification model satisfies the following formula:
because the present invention analyzes the same soil particle, the soil particle contains a volume of solids when the saturation of the soil particle changes due to changing environmental parameters
No change occurs. In yet another alternative embodiment, the obtaining the saturation degree of the soil particles according to the classification result and the physical property of the saturation degree of the soil particles in the above embodiment includes the following steps: setting saturation relative humidity, and acquiring the saturation form volume of soil particles under the saturation relative humidity condition, wherein the saturation relative humidity represents the relative humidity when the relative humidity is greater than the relative humidity saturation threshold value; classifying the components of the saturated form volume to obtain a saturated state soil particle component equation; characterizing the water content by using the classification result of the saturated form volume to obtain a water content characterization equation of the soil particles; combining the saturated state soil particle component equation and the water content characterization equation of the soil particles to obtain the solid volume in the soil particles; constructing a saturation model of the soil particles under any relative humidity by using the solid volume and the morphological volume of the soil particles and the physical property of the saturation of the soil particles; and obtaining the saturation of the single soil particles under different relative humidities through the saturation model. In this embodiment, the saturated soil particle composition equation and the water content characterization equation of the soil particles respectively satisfy the following formulas:
wherein the content of the first and second substances,
which represents the volume of the saturated morphology,
which represents the moisture content of the soil particles under saturated relative humidity conditions,
which represents the volume of solids in the soil particles,
which represents the volume of water in the soil particles,
which is indicative of the density of the water,
expressing the solid density, and the solid volume obtained by combining the saturated state soil particle component equation and the soil particle water content characterization equation satisfies the following formula:
. The saturation model obtained by combining the solid volume and the morphological volume of the soil particles with the physical property of the soil particle saturation satisfies the following formula:
wherein the content of the first and second substances,
which represents the degree of saturation, is,
which is indicative of the relative humidity of the water,
is indicative of a relative humidity saturation threshold value,
，
indicates a relative humidity of
Water content, R represents a molecular gas constant, T represents an absolute temperature,
which is indicative of the density of the water,
representing the molecular mass of water.
And S05, summarizing data of soil body adsorption force and saturation of the same soil particles under different relative humidity.
In step S05, the corresponding data statistical program can be compiled by using existing data statistical tools such as Excel, VBA, matlab, mathematica, and the like, or programming tools such as Python, java, and the like, so as to achieve the purpose of summarizing the data of the soil adsorption force and saturation of the same soil particle under different relative humidities. The related content of the related prior art is not elaborated in detail, and the mode not only can realize the summary of the data of the soil adsorption force and the saturation of the same soil particle under different relative humidity, but also can realize the functions of data screening and the like.
S06, obtaining a soil saturation-adsorption force relation curve through multiple groups of data, and representing the soil microstructure water holding capacity of the soil sample to be detected by utilizing the soil saturation-adsorption force relation curve.
In step S06, a soil saturation-adsorption force relationship curve is obtained through multiple sets of data, and the soil saturation-adsorption force relationship curve is used to characterize the water holding capacity of the soil microstructure of the soil sample to be tested, in an optional embodiment, a tool used in step S05 for summarizing data may be continued, and after the data is summarized, screened, and the like, the tool is used to fit the soil saturation-adsorption force relationship curve through the data obtained after processing. In a specific embodiment, the Excel tool adopted in step S05 performs processing such as summarizing and screening on the data, and a corresponding soil saturation-adsorption force relation curve is made by using the processed data of Excel. Referring to fig. 4, fig. 4 is a soil saturation-adsorption force relationship curve of a soil microstructure of bentonite.
The method for characterizing the water holding capacity of the soil microstructure provided by the invention realizes the crossing of the macroscopic analysis to the microscopic analysis of the soil sample to be tested by acquiring the microscopic morphology of the soil sample to be tested and carrying out qualitative and quantitative analysis on the microscopic morphology, and obtains the real soil saturation-adsorption force relation curve of the soil microstructure, wherein the soil saturation-adsorption force relation curve of the soil microstructure is an accurate representation of the water holding capacity of the soil in the microscopic aspect, and has the advantages of small error, short measurement time and wide application range. Meanwhile, aiming at the micro aggregates with high expansibility such as bentonite and the like, a saturation-adsorption force relation curve for representing the water retention characteristic of the micro aggregates can be obtained through the method, so that the method is beneficial to the analysis work of the adsorbability and the mechanical property of the bentonite, and provides accurate data reference for designing and selecting barrier material parameters such as nuclear waste and the like.
Referring to fig. 5, the present invention further provides a soil microstructure water-holding capacity characterization system, where the soil microstructure water-holding capacity characterization system includes a processor 501, an input device 502, an output device 503, and a memory 504, where the processor 501, the input device 502, the output device 503, and the memory 504 are connected to each other, where the memory 504 is used to store a computer program, the computer program includes program instructions, and the processor 501 is configured to call the program instructions to execute the soil microstructure water-holding capacity characterization method provided by the present invention. The soil microstructure water holding capacity characterization system provided by the invention has the advantages of compact structure, stable operation and strong expansibility, is beneficial to carrying out corresponding system reconstruction aiming at different soil samples to be detected, and ensures the stable execution of the soil microstructure water holding capacity characterization method while expanding the application range of the soil microstructure water holding capacity characterization system.
In an alternative embodiment, the Processor 501 may be a Central Processing Unit (CPU), and may be other general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an FPGA (Field-Programmable Gate Array) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. In a specific embodiment, the input device 502 may be an environmental scanning electron microscope and a corresponding data connector for acquiring the micro-topography of the soil sample to be measured under different relative humidities. The output device 503 is used for outputting the saturation-adsorption force relation curve obtained by the program instructions stored in any computer readable storage medium provided by the invention to the target terminal for displaying. The memory 504, which may include both read-only memory and random-access memory, provides instructions and data to the processor 501. A portion of the memory 504 may also include non-volatile random access memory.
In yet another alternative embodiment, the processor 501, the input device 502, and the output device 503 described in this embodiment of the present invention may execute the implementation described in the program instructions stored in any computer-readable storage medium provided by the present invention, and may also execute the implementation of the terminal device described in this embodiment of the present invention, which is not described herein again. The computer-readable storage medium may be an internal storage unit of the terminal device in any of the foregoing embodiments, for example, a hard disk or a memory of the terminal device. The computer-readable storage medium may also be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided in the terminal device. Further, the computer-readable storage medium may include both an internal storage unit and an external storage device of the terminal device. The computer-readable storage medium stores the computer program and other programs and data required by the terminal device. The above-described computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (5)
1. A method for characterizing the water holding capacity of a soil microstructure is characterized by comprising the following steps:
providing a soil body sample to be detected;
measuring the micro-morphology, the water content and the soil adsorption capacity of the soil sample to be measured under different relative humidities;
according to the micro morphology, obtaining the morphological volume of single soil particles in the soil body sample to be detected under different relative humidity;
obtaining the saturation of the single soil particles under different relative humidity by using the water content and the morphological volume;
summarizing data of soil body adsorption force and saturation corresponding to the same soil particles under different relative humidity;
obtaining a soil saturation-adsorption force relation curve through multiple groups of data, and representing the soil microstructure water holding capacity of the soil sample to be detected by using the soil saturation-adsorption force relation curve;
the method for obtaining the saturation degree of the single soil particles under different relative humidity by combining the water content with the morphological volume comprises the following steps:
setting a relative humidity saturation threshold;
classifying the components of the morphological volume by using the relative humidity saturation threshold, wherein the classification result comprises a component classification model, and the component classification model satisfies the following formula:
wherein the content of the first and second substances,
represents the shape and volume of soil particles>
Represents the solid volume in soil particles>
Represents the volume of water and air in the soil particle>
Represents the volume of water in the soil particles>
Represents the volume of air in the soil particle>
Which is indicative of the relative humidity of the water,
represents a relative humidity saturation threshold value, is present>
Represents the saturation of the soil particles;
obtaining the saturation of single soil particles under different relative humidities according to the classification result and the physical property of the saturation of the soil particles;
the method for obtaining the saturation degree of the soil particles by combining the physical properties of the saturation degree of the soil particles according to the classification result comprises the following steps:
setting saturated relative humidity, and obtaining the saturated form volume of soil particles under the saturated relative humidity condition;
classifying the components of the saturated form volume to obtain a saturated state soil particle component equation, wherein the saturated state soil particle component equation satisfies the following formula:
wherein is present>
Represents a saturated morphological volume, is selected>
Represents the solid volume in soil particles>
Represents the volume of water in the soil particles;
characterizing the water content by using the classification result of the saturated form volume to obtain a water content characterization equation of the soil particles, wherein the water content characterization equation of the soil particles meets the following formula:
wherein is present>
Represents the water content of the soil particles under saturated relative humidity conditions, <' > is expressed>
Indicates the density of the water>
Represents the solid density;
and combining the saturated state soil particle component equation and the water content characterization equation of the soil particles to obtain the solid volume in the soil particles, wherein the solid volume satisfies the following formula:
；
constructing a saturation model of the soil particles under any relative humidity by using the solid volume and the morphological volume of the soil particles and the physical property of the saturation of the soil particles, wherein the saturation model satisfies the following formula:
wherein, the first and the second end of the pipe are connected with each other,
represents the degree of saturation, is greater than or equal to>
Represents relative humidity, < > or >>
Represents a relative humidity saturation threshold value, is present>
Indicates that water content is greater or less>
Adsorption force with soil mass->
Is based on a functional relationship of->
Represents the adsorption force of the soil body>
And relative humidity->
Is based on a functional relationship of->
Indicates that water content is greater or less>
And relative humidity->
In a functional relationship of (a), R represents the molecular gas constant, T represents the absolute temperature, R represents the absolute temperature>
Indicates the density of the water>
Represents the molecular mass of water;
and obtaining the saturation of the single soil particles under different relative humidities through the saturation model.
2. The soil microstructure water holding capacity characterization method of claim 1, wherein the measuring of the micro-topography of the soil sample to be measured at different relative humidities comprises the following steps:
providing an electron microscope, and placing a soil sample to be detected into a shooting environment of the electron microscope;
fixing the shooting visual angle of the electron microscope, and adjusting the relative humidity of the shooting environment;
and capturing the micro-topography images of a plurality of soil body samples to be detected by using the electron microscope under the shooting environments with different relative humidity.
3. The soil microstructure water holding capacity characterization method of claim 1, wherein measuring the water content and the soil adsorption capacity of the soil sample to be measured under different relative humidity comprises the following steps:
fitting the functional relationship between water content and soil adsorption force
In which>
Indicates the water content and is greater or less>
Expressing the soil adsorption force;
obtaining the functional relation between the soil adsorption force and the relative humidity
Wherein is present>
Represents relative humidity;
binding function relationships
And functional relationship>
Obtaining a functional relationship between water content and relative humidity
；
Using said functional relationship
The functional relationship->
And said functional relationship>
And obtaining the water content and the soil body adsorption capacity under different relative humidity.
4. The soil microstructure water holding capacity characterization method of claim 2, wherein the obtaining of the morphological volume of the individual soil particles in the soil sample to be tested at different relative humidities according to the micro-topography comprises the steps of:
selecting single soil particles with clear edges from the micro-topography images of the soil body samples to be detected;
tracking the positions of the single soil particles in the micro-topography images of the rest soil body samples to be detected;
and estimating the shape volume of the single soil particle in the micro-topography picture of each soil sample to be detected.
5. A soil microstructure water holding capacity characterization system, comprising an input device, a processor, a memory and an output device, wherein the input device, the processor, the memory and the output device are connected to each other, wherein the memory is used for storing a computer program, the computer program comprises program instructions, and the processor is configured to call the program instructions to execute the soil microstructure water holding capacity characterization method according to any one of claims 1 to 4.
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