CN117191894A - Soil physical property testing system and method based on thermal response and storage medium - Google Patents
Soil physical property testing system and method based on thermal response and storage medium Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 218
- 230000004044 response Effects 0.000 title claims abstract description 130
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- 238000012360 testing method Methods 0.000 title claims abstract description 34
- 238000003860 storage Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims description 51
- 239000011800 void material Substances 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 239000000758 substrate Substances 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 4
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- 238000012625 in-situ measurement Methods 0.000 description 1
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- 229910002027 silica gel Inorganic materials 0.000 description 1
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Abstract
The application provides a thermal response-based soil physical property testing system, a thermal response-based soil physical property testing method and a thermal response-based soil physical property testing storage medium. According to the application, the soil density and the soil void ratio are calculated through the thermal response characteristics, and the accuracy and the stability are high.
Description
Technical Field
The application relates to the technical field of soil physical property measurement, in particular to a thermal response-based soil physical property test system, a thermal response-based soil physical property test method and a thermal response-based soil physical property test storage medium.
Background
Physical properties of soil, such as gravel content, void fraction, density, water content, etc., are key physical properties of soil, and these key physical properties have direct influence on design and construction of building structures. Efficient and accurate acquisition of these critical physical properties of the soil is a major goal for pre-construction surveys.
Aiming at the physical properties of soil, such as density and void ratio, the current accurate mode is to sample the soil and then send the soil to a laboratory for measurement (direct measurement), but the mode is complex, the sampling measurement cannot be ensured at the original position of the soil, the soil body cannot be ensured not to be damaged, and the time consumption is long.
Or, indirect measurement methods (indirect measurement), such as resistance-based, ultrasonic-based, and optical-fiber-based methods, all of which require higher accuracy after calibration of laboratory measurement results. That is, these indirect measurement methods generally require comparison with direct method results, otherwise accuracy cannot be guaranteed.
In view of the foregoing, there is a need for a thermal response based soil property testing system, method and storage medium that addresses or at least alleviates the above-mentioned drawbacks.
Disclosure of Invention
The application mainly aims to provide a thermal response-based soil physical property testing system, a thermal response-based soil physical property testing method and a thermal response-based soil physical property testing storage medium, so as to solve the problems that in the prior art, the measurement of the physical property of soil cannot be guaranteed to be sampled and measured at the original position of the soil by adopting a direct measurement mode, the soil body cannot be guaranteed not to be damaged, the time consumption is long, and the measurement mode needs to be calibrated by a laboratory measurement result and then the measurement mode has high precision.
In order to achieve the above object, the present application provides a soil testing system based on thermal response, comprising a substrate, a heating device, a temperature acquisition device, a first electrode pair and a second electrode pair, wherein the heating device, the temperature acquisition device, the first electrode pair and the second electrode pair are arranged on the substrate;
the temperature acquisition device is used for acquiring the temperature of the heated soil by the heating device;
the first electrode pair comprises two first electrodes with a first preset interval distance; the second electrode pair comprises two second electrodes with a second preset value of interval distance, and the second preset value is larger than the first preset value.
The application also provides a soil physical property testing method based on thermal response, which is applied to the soil physical property testing system based on thermal response, and comprises the following steps:
s1, when the heating device is in a heating state, acquiring a soil temperature data set acquired by the temperature acquisition device in the heating process, and determining the temperature T of the current soil along with time according to the soil temperature data setTemperature response curve of (2);
s2, determining a theoretical calculation distance between the heating device and the temperature acquisition deviceAnd the heating power of the heating device +.>；
S3, according to the heating powerTheoretical calculated distance->And determining the total of the current soil from the temperature response curveThermal response Property->The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For the thermal conductivity of the soil>Is the thermal diffusivity of the soil;
s4, determining the hydrothermal response characteristic of the current soilAccording to the total thermal response characteristic +.>And hydrothermal response Property->Determining the dry soil thermal response characteristics of said current soil +.>；
S5, determining the water content of the current soilAccording to the water content ∈>General thermal response Property->Determining the soil density of said current soil>The method comprises the steps of carrying out a first treatment on the surface of the According to the thermal response characteristics of the dry soil->Determining the soil void fraction of said current soil>。
Preferably, the temperature response curve in the step S1 is:the method comprises the steps of carrying out a first treatment on the surface of the Wherein T is the real-time temperature of the current soil, < >>For the soil temperature before calibration of the temperature response curve, < + >>And->Is a fitting parameter of the thermal response of the soil, +.>For the moment before the calibration of the temperature response curve and +.>Corresponding to the above.
Preferably, the step S3 specifically includes the steps of:
s31, adopting a formulaDetermination of the thermal response time characteristics of the soil +.>；
S32, according to the heating powerTheoretical calculated distance->And a temperature response curve, and adopts the formulaDetermining the total thermal response characteristic of said current soil>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Is the thermal response time characteristic of the soil, +.>Is the circumference ratio.
Preferably, the step S4 specifically includes the steps of:
using the formulaDetermining the hydrothermal response characteristic of said current soil>The method comprises the steps of carrying out a first treatment on the surface of the Wherein a is 0 ...a n For the corresponding fitting parameters +.>Is the current pressure;
according to the total thermal response characteristicAnd hydrothermal response Property->And adopts the formulaDetermining the dry soil thermal response characteristics of said current soil +.>。
Preferably, in the step S5, "determining the water content of the current soilThe method specifically comprises the following steps:
using the formulaDetermining the water content of said current soil +.>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>、/>、/>、/>For fitting parameters +.>And the first electrode pair corresponds to a soil capacitance value.
Preferably, in the step S5, "determining the water content of the current soilThe method specifically comprises the following steps:
acquiring a soil capacitance value corresponding to the first electrode pairAnd acquiring the corresponding soil capacitance value of the second electrode pair +.>；
Using the formulaDetermining a dimensionless capacitance signal +.>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Capacitance value for electromagnetic interference;
using the formulaDetermining the water content of said current soil +.>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>、/>、/>、/>Is a fitting parameter.
Preferably, in the step S5, "according to the water content ratioGeneral thermal response Property->Determining the soil density of said current soil>"comprising the steps of:
according to the water contentGeneral thermal response Property->And adopts the formulaDetermining the soil density of said current soil>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>、/>、/>、/>、/>For fitting parameters +.>Is the total thermal response characteristic of the soil in the reference state,is the soil density in the reference state +.>The water content in the reference state.
Preferably, in the step S5, "according to the thermal response characteristics of the dry soilDetermining the soil void fraction of said current soil>"comprising the steps of:
according to the thermal response characteristics of the dry soilAnd adopts the formulaDetermining soil void fraction->The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>、/>、/>In order to fit the parameters of the model,is the thermal response characteristic of dry soil under the reference state, < + >>The soil void fraction in the reference state.
The present application also provides a storage medium storing a computer program which, when executed by a processor, implements the steps of a thermal response based soil property testing method as described above.
Compared with the prior art, the application has the following beneficial effects:
the application provides a thermal response-based soil physical property testing system, a thermal response-based soil physical property testing method and a thermal response-based soil physical property testing storage medium.
According to the application, through the thermal response characteristics, particularly the thermal response characteristics of dry soil, and then reversely calculating the soil density and the soil void ratio, the application can realize in-situ measurement without sending the soil to a laboratory for measurement after sampling, and the soil body can not be destroyed to the greatest extent.
In addition, through mutual correction between the first electrode pair and the second electrode pair, the influence of local electromagnetic interference (the interference possibly exists on the ground and underground) on the measurement result can be effectively avoided, and the precision of the final test is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an overall structure according to an embodiment of the present application;
FIG. 2 is a schematic diagram of the overall structure of another embodiment of the present application;
FIG. 3 is a flow chart of an embodiment of the present application;
FIG. 4 is a schematic diagram of a temperature response curve according to an embodiment of the present application;
FIG. 5 shows the water content in an embodiment of the applicationAnd dimensionless capacitance signal->Is a graph of the relationship of (2).
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Reference numerals illustrate:
10. a base; 20. a heating device; 30. a temperature acquisition device; 40. a first electrode pair; 50. a second electrode pair; 60. an insulating material.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.
Referring to fig. 1 to 5, a soil physical property testing system based on thermal response according to an embodiment of the present application includes a substrate 10, a heating device 20 mounted on the substrate 10, a temperature acquisition device, a first electrode pair 40 and a second electrode pair 50;
wherein, the temperature acquisition device 30 is used for acquiring the temperature of the soil heated by the heating device 20; the first electrode pair 40 includes two first electrodes with a first preset distance; the second electrode pair 50 includes two second electrodes spaced apart by a second predetermined distance, the second predetermined distance being greater than the first predetermined distance.
As a specific example, referring to fig. 1 again, the substrate 10 is a cross plate, the heating device 20 and the temperature acquisition device 30 are respectively located on two plates of the cross plate, and the geometric center of the two plates has a connecting line length of the two platesTheoretical calculated distance between thermal device 20 and said temperature acquisition device 30The first electrode pair 40 and the second electrode pair 50 are located on the other side of the cross plate, the second electrode pair 50 is located on the outer side of the first electrode pair 40, the two second electrodes are located on the two plates of the cross plate respectively, the geometric center distance between the two second electrodes is the second preset value, the two first electrodes are located on the two plates of the cross plate respectively, the geometric center distance between the two first electrodes is the first preset value, and obviously, the second preset value is larger than the first preset value. It should be noted that, due to the magnitude relation between the first preset value and the second preset value, the second preset value is larger than the first preset value, so as to eliminate electromagnetic interference.
As another specific example, referring to fig. 2 again, in this embodiment, similar to a static cone penetration device, specifically, the lower end of the substrate 10 has a tip to reduce the damage degree of the entering soil, and the temperature acquisition device 30, the heating device 20, the second electrode pair 50 and the first electrode pair 40 are sequentially disposed on the substrate 10 from top to bottom, the distance between the two second electrodes of the second electrode pair 50 is the second preset value, the distance between the two first electrodes of the first electrode pair 40 is the first preset value, and the second preset value is greater than the first preset value, so as to eliminate electromagnetic interference. And insulating materials 60 are respectively arranged among the temperature acquisition device 30, the heating device 20, the second electrode pair 50 and the first electrode pair 40, so that the measurement reliability is ensured.
As a preferred example, the heating device adopts a silica gel heating film, the heating power is generally 10-100W, the voltage is 12-36VDC or 220-380VAC, the first preset value is 20-70mm, and the second preset value is 30-100mm.
The application also provides a soil physical property testing method based on thermal response, which is applied to the soil physical property testing system based on thermal response, and comprises the following steps:
s1, when the heating device 20 is in a heating state, acquiring the temperature of the heating device in the heating processA soil temperature data set acquired by the temperature acquisition device 30, and determining the temperature T of the current soil along with time according to the soil temperature data setTemperature response curve of (2); specifically, the soil temperature data are fitted sequentially according to the time sequence to obtain a temperature response curve, and further, the temperature response curve in the step S1 is as follows: />Wherein T is the real-time temperature of the current soil, < >>For the soil temperature before calibration of the temperature response curve, < + >>And->Is a fitting parameter of the thermal response of the soil,and->Can be used for calculating +.>，/>For the moment before the calibration of the temperature response curve and +.>Corresponding to that shown in fig. 4.
S2, determining a theoretical calculation distance between the heating device 20 and the temperature acquisition device 30And the heating power of said heating means 20 +.>The method comprises the steps of carrying out a first treatment on the surface of the For example, when the substrate is a cross plate, the distance is theoretically calculated +.>Is the distance between the geometric center of the heating device 20 and the geometric center of the temperature acquisition device 30.
S3, according to the heating powerTheoretical calculated distance->And determining the total thermal response characteristic of said current soil from the temperature response curve>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For the thermal conductivity of the soil>Is the thermal diffusivity of the soil; note that the thermal conductivity of the soilAnd soil thermal diffusivity->The ratio of the two parameters is taken as the total thermal response characteristic of the soil;
as a preferred embodiment, the step S3 specifically includes the steps of:
s31, adopting a formulaDetermination of the thermal response time characteristics of the soil +.>The method comprises the steps of carrying out a first treatment on the surface of the I.e. fitting parameters +.>Is->、/>Can be obtained by fitting, and the functional relation satisfies a linear relation.
S32, according to the heating powerTheoretical calculated distance->And a temperature response curve, and adopts the formulaDetermining the total thermal response characteristic of said current soil>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Is the thermal response time characteristic of the soil, related to the baseline state of the soil before heating, ++>Is the circumference ratio.
S4, determining the hydrothermal response characteristic of the current soilAccording to the total thermal response characteristic +.>And hydrothermal response Property->Determining the dry soil thermal response characteristics of said current soil +.>；
As a preferred embodiment, the step S4 specifically includes the steps of:
using the formulaDetermining the hydrothermal response characteristic of said current soil>The method comprises the steps of carrying out a first treatment on the surface of the Wherein a is 0 ...a n For the corresponding fitting parameters +.>The superscript represents the power for the current pressure; it should be noted that the thermal response of water is a constant, but also varies with pressure, and the fitting can be generally performed by directly fitting the polynomial of the pressure as shown in the following formula, i.e. +.>，a 0 ...a n Fitting parameters determined based on data fitting, +.>The current pressure, the superscript, stands for power, this equation is very common, i.e. a fitting of the fundamental physical properties of water, e.g. n takes 3, a as a specific example 0 =4.1767e6，a 1 =-1.2059，a 2 =8.6412e-6，a 3 -2.0144e-11; this part of the content belongs to basic thermodynamic knowledge and is not described in detail here.
According to the total thermal response characteristicAnd hydrothermal response Property->And adopts the formulaDetermining the dry soil thermal response characteristics of said current soil +.>. Notably, the total thermal response characteristics of the soil +.>Can be regarded as the thermal response properties of dry soil (++>) Thermal response characteristics with water) Is a simple addition of: i.e. < ->It can be seen that the left side of the formula +.>The determination has been made by the above formula, right of the equal sign +.>Can also be determined by the above formula, and thus the dry soil thermal response characteristic can be determined>。
S5, determining the water content of the current soilAccording to the water content ∈>General thermal response Property->Determining the soil density of said current soil>The method comprises the steps of carrying out a first treatment on the surface of the According to the thermal response characteristics of the dry soil->Determining the currentSoil void fraction of soil->。
As a preferred embodiment, in the step S5, "determining the moisture content of the current soilThe method specifically comprises the following steps:
using the formulaDetermining the water content of said current soil +.>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>、/>、/>、/>For fitting parameters +.>For the first electrode pair 40 to correspond to the soil capacitance value, add +.>Is to achieve a better fit, < +.>Generally depending on the construction of the capacitive sensor itself, < +.>And->Representing the influence relationship->In order to improve the fitting accuracy. The water content of the current soil can be rapidly determined based on the formula.
As another preferred embodiment, in the step S5, "determining the moisture content of the current soilThe method specifically comprises the following steps:
acquiring a soil capacitance value corresponding to the first electrode pair 40And acquiring a soil capacitance value corresponding to the second electrode pair 50>；
Using the formulaDetermining a dimensionless capacitance signal +.>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Capacitance value brought by interference of the whole measuring circuit and the environment; specifically, the->Essentially a reference capacitance, the measured deviation is made smaller by the method, i.e. the +.in the above formula for calculating x>Smaller. />Is caused by capacitive interference of the whole measuring circuit and the environment, i.e., in this case,/->Is the capacitance measured, and +.>-/>It is the true capacitance of the soil.
Using the formulaDetermining the water content of said current soil +.>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>、/>、/>、/>Is a fitting parameter.
In this embodiment, it should be noted by those skilled in the art that the electromagnetic interference of the ground is different from that of the ground, and the electromagnetic interference of the ground is generally large, so that the current testing process may occur, the capacitance range measured on the ground is 100-110pf (corresponding to the dry and 100% water content), but the capacitance is reduced to 80-88pf in the ground, and the deviation between the absolute value and the relative value occurs, so that the measurement accuracy cannot be ensured. In order to eliminate electromagnetic interference, in this embodiment, a soil capacitance value corresponding to the first electrode pair 40 is obtainedThen, the corresponding soil capacitance value of the second electrode pair 50 is further acquired>By using the formula->Determining a dimensionless capacitance signal +.>Based on a dimensionless capacitance signal +.>Then through the formulaDetermining the water content of said current soil +.>By mutual correction between the first electrode pair 40 and the second electrode pair 50, the influence of local electromagnetic interference (both above ground and underground may exist) on the measurement result can be effectively avoided, and the accuracy of the final test is improved.
Further, in the step S5, "according to the water contentGeneral thermal response Property->Determining the soil density of said current soil>"comprising the steps of:
according to the water contentGeneral thermal response Property->And adopts the formulaDetermining the soil density of said current soil>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>、/>、/>、/>、/>For fitting parameters +.>Is the total thermal response characteristic of the soil in the reference state,is the soil density in the reference state +.>The water content in the reference state.
Wherein m is 0 Is a reference value, which is generally related to the capacitance value of the sensor line itself, to the manufacturing process, design, and field of use of the sensor; m is m 1 Represents the influence of the thermal parameter change of the soil on the soil density, and the contrary is 1/m 1 Representing the effect of soil density on soil thermal parameters, in general, the greater the soil density, the greaterThe higher will be. m is m 2 The more sand, the m, is related to the particle size of the soil 2 The larger is generally. m is m 3 Represents the influence of the thermal parameter change of the soil on the water content of the soil, 1/m 3 Represents the influence of the water content on the change of the thermal parameter, m 4 Is a fitting term for improving accuracy. But here +.>Thermal response characteristics of dry soil（/>) M is then 3 =0 and m 4 =0。
Through the calculation, the thermal response characteristic of the dry soil is obtainedThis characteristic is related to parameters such as soil composition, source, density, void fraction, etc. By desiccating the soil thermal response Properties->Other physical properties (such as soil density and soil void ratio) of the soil can be reversely calculated, and the aim of testing the soil components and other properties is fulfilled.
Further, in the step S5, "according to the thermal response characteristics of the dry soilDetermining the soil void fraction of said current soil>"comprising the steps of:
according to the thermal response characteristics of the dry soilAnd adopts the formulaDetermining soil void fraction->The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>、/>、/>In order to fit the parameters of the model,is the thermal response characteristic of dry soil under the reference state, < + >>The soil void fraction in the reference state. Similarly, let go of>This value is generally related to the capacitance value of the sensor line itself, to the manufacturing process, design, and field of use of the sensor;is the influence of the soil density, which is also related to the soil porosity, the greater the soil density, the smaller the soil porosity, then the +.>The higher the->Larger represents a larger content of the soil powder group.
Due to density%) Is equal to the water content (/ ->) The mechanism of action on thermal response is complex and can also be calculated by the following formula:
；
i.e. by thermal response parameters of dry soilThe density (++)>）。
The present application also provides a storage medium storing a computer program which, when executed by a processor, implements the steps of a thermal response based soil property testing method as described above. It will be appreciated that the thermal response based soil property testing method described above is implemented when executed by the processor, and therefore all embodiments of the method described above are applicable to the storage medium and achieve the same or similar benefits.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. The soil physical property testing system based on thermal response is characterized by comprising a substrate, a heating device, a temperature acquisition device, a first electrode pair and a second electrode pair, wherein the heating device, the temperature acquisition device, the first electrode pair and the second electrode pair are arranged on the substrate;
the temperature acquisition device is used for acquiring the temperature of the heated soil by the heating device;
the first electrode pair comprises two first electrodes with a first preset interval distance; the second electrode pair comprises two second electrodes with a second preset value of interval distance, the second preset value is larger than the first preset value, the range of the first preset value is 20-70mm, and the range of the second preset value is 30-100mm.
2. A thermal response based soil physical property testing method applied to the thermal response based soil physical property testing system of claim 1, comprising the steps of:
s1, when the heating device is in a heating state, acquiring a soil temperature data set acquired by the temperature acquisition device in the heating process, and determining the temperature T of the current soil along with time according to the soil temperature data setTemperature response curve of (2);
s2, determining a theoretical calculation distance between the heating device and the temperature acquisition deviceAnd the heating power of the heating device +.>；
S3, according to the heating powerTheoretical calculated distance->And determining the total thermal response characteristic of said current soil from the temperature response curve>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For the thermal conductivity of the soil>Is the thermal diffusivity of the soil;
s4, determining the hydrothermal response characteristic of the current soilAccording to the total thermal response characteristic +.>And hydrothermal response Property->Determining the dry soil thermal response characteristics of said current soil +.>；
S5, determining the water content of the current soilAccording to the water content ∈>General thermal response Property->Determining the soil density of said current soil>The method comprises the steps of carrying out a first treatment on the surface of the According to the thermal response characteristics of the dry soil->Determining the soil void fraction of said current soil>。
3. The thermal response-based soil physical property testing method according to claim 2, wherein the temperature response curve in the step S1 is:the method comprises the steps of carrying out a first treatment on the surface of the Wherein T is the real-time temperature of the current soil, < >>For the soil temperature before calibration of the temperature response curve, < + >>And->Is a fitting parameter of the thermal response of the soil, +.>For the moment before the calibration of the temperature response curve and +.>Corresponding to the above.
4. The method for testing soil physical properties based on thermal response according to claim 3, wherein the step S3 specifically comprises the steps of:
s31, adopting a formulaDetermination of the thermal response time characteristics of the soil +.>；
S32, according to the heating powerTheoretical calculated distance->And a temperature response curve, and adopts the formulaDetermining the total thermal response characteristic of said current soil>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Is the thermal response time characteristic of the soil, +.>Is the circumference ratio.
5. The method for testing soil physical properties based on thermal response according to claim 2, wherein the step S4 specifically comprises the steps of:
using the formulaDetermining the hydrothermal response characteristics of the current soilThe method comprises the steps of carrying out a first treatment on the surface of the Wherein a is 0 ...a n For the corresponding fitting parameters +.>Is the current pressure;
according to the total thermal response characteristicAnd thermal response Property of Water->And adopts the formulaDetermining the dry soil thermal response characteristics of said current soil +.>。
6. The thermal response-based soil physical property testing method according to claim 4, wherein the step S5 is to determine the water content of the current soilThe method specifically comprises the following steps:
using the formulaDetermining the water content of said current soil +.>The method comprises the steps of carrying out a first treatment on the surface of the Wherein the method comprises the steps of，/>、/>、/>、/>For fitting parameters +.>And the first electrode pair corresponds to a soil capacitance value.
7. The thermal response-based soil physical property testing method according to claim 4, wherein the step S5 is to determine the water content of the current soilThe method specifically comprises the following steps:
acquiring a soil capacitance value corresponding to the first electrode pairAnd obtaining the capacitance value of the soil corresponding to the second electrode；
Using the formulaDetermining a dimensionless capacitance signal +.>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For the whole measurementThe capacitance value caused by the interference of the circuit and the environment;
using the formulaDetermining the water content of said current soil +.>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>、、/>、/>Is a fitting parameter.
8. The method according to claim 7, wherein the step S5 is performed according to the water contentGeneral thermal response Property->Determining the soil density of said current soil>"comprising the steps of:
according to the water contentGeneral thermal response Property->And adopts the formulaDetermining the soil density of said current soil>The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>、/>、/>、/>、/>For fitting parameters +.>Is the total thermal response characteristic of the soil in the reference state,is the soil density in the reference state +.>The water content in the reference state.
9. The method according to claim 7, wherein the step S5 is performed according to the thermal response characteristics of the dry soilDetermining the soil void fraction of said current soil>"comprising the steps of:
according to the thermal response characteristics of the dry soilAnd adopts the formula +.>Determining soil void fraction->The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>、/>、/>For fitting parameters +.>Is the thermal response characteristic of dry soil under the reference state, < + >>The soil void fraction in the reference state.
10. A storage medium storing a computer program which, when executed by a processor, implements the steps of a thermal response based soil property testing method according to any one of claims 2 to 9.
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