CN113030438A - Method for testing water content and water content of rock-soil body based on thermodynamic equilibrium - Google Patents
Method for testing water content and water content of rock-soil body based on thermodynamic equilibrium Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 130
- 239000002689 soil Substances 0.000 title claims abstract description 68
- 238000012360 testing method Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 239000011435 rock Substances 0.000 abstract description 15
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- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
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- G—PHYSICS
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
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Abstract
The invention provides a method for testing the water content and the water content of a rock-soil body based on thermodynamic equilibrium, which mainly comprises the following steps: (1) testing the temperature and humidity of a rock-soil body; (2) testing the porosity (fracture rate) of the rock-soil body; (3) and (4) calculating the water content and the water content of the rock-soil body. The method provided by the invention can test and calculate the water content and the water content in the rock-soil body by means of the properties of liquid water and gaseous water under thermodynamic equilibrium. The method has the advantages of simple operation and accurate test result, can unify the test methods of the soil and the rock, can be widely applied to the test of the water content and the water content of each rock and soil body, and has important significance for the accurate determination of the water content and the water content in agricultural planting, mine greening and land reclamation.
Description
Technical Field
The invention relates to the technical field of resources and environment, in particular to a method for testing the water content and water content of a rock-soil body based on thermodynamic equilibrium.
Background
The rock-soil body unsaturated zone is a complex system with coexistence of solid, liquid and gas phases and is also an important place for migration and transformation of underground water, soil water and atmospheric water, and the water-containing state inside the rock-soil body increasingly draws more attention in the fields of agriculture, rock soil and the like. For a long time, scholars at home and abroad research water content testing methods of rock and soil masses with different media from various angles, and the testing technology is more and more comprehensive from an initial drying and weighing method to the current methods such as a neutron instrument method, a dielectric method, a remote sensing method and the like, and more pay more attention to in-situ dynamic measurement of the water content of the rock and soil masses.
However, the existing methods have the following defects through analysis: the method has the advantages that firstly, the water content test of the soil medium is more emphasized, and due to the difference of the physical properties of the rock medium and the soil medium, the related parameters are difficult to obtain during calculation, and the calculation accuracy is not high; secondly, the water content testing method is biased to reversely deduce through some physical signals or geotechnical experiments, the dynamic change process of the water in the rock-soil body is neglected in the testing process, and the testing result can only reflect the instant value at a certain moment and cannot represent the real water-containing condition in the rock-soil body; thirdly, according to the theory and research of thermodynamics, the physical parameters such as the density of water under different temperature conditions are different, so that a certain error exists between a measured value and a true value; the prior art tests the water content in rock and soil bodies, and cannot determine the actual water content.
Disclosure of Invention
In view of the above, the invention aims to provide a method for testing water content and water content of rock-soil mass based on thermodynamic equilibrium, which comprises the following steps:
s1, testing the temperature and humidity value in the target rock-soil body by using a temperature and humidity instrument, and recording the temperature and humidity value of the rock-soil body in a thermodynamic equilibrium state;
s2, taking rock-soil mass samples, and testing the porosity or fracture rate of the rock-soil mass in a laboratory;
s3, substituting the temperature value tested in the S1 and the porosity or fracture rate value tested in the S2 into a formula for calculating the water content and the water content to obtain the water content and the water content value of the rock-soil body;
the formulas for calculating the water content and the water content are respectively as follows:
wherein Wv (T) represents the water content of rock-soil mass at temperature T, and mwater(T) represents the mass of liquid water in the rock-soil mass at temperature T, pwater(T) represents the density of liquid water at temperature T, VpThe porosity or the fissure rate of the rock-soil body is represented, alpha (T) represents the function relation of the mass ratio of the liquid water and the gaseous water and the temperature T, and beta (T) represents the function relation of the density ratio of the liquid water and the gaseous water and the temperature T.
The technical scheme provided by the invention has the beneficial effects that: the invention breaks the thinking of the traditional water content testing method, analyzes the properties and the contents of liquid water and gaseous water from a thermodynamic equilibrium system of gas-liquid conversion of water in rock-soil mass by means of the theoretical basis of thermodynamics and system science, and constructs a novel rock-soil mass water content and water content testing method. The method has the advantages of simple operation and accurate test result, can unify the test methods of the soil and the rock, can be widely applied to the test of the water content and the water content of each rock and soil body, and has important significance for the accurate determination of the water content and the water content in agricultural planting, mine greening and land reclamation.
Drawings
FIG. 1 is a flow chart of a method for testing water content and water content of rock and soil mass based on thermodynamic equilibrium.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, the invention provides a method for testing water content and water content of rock-soil mass based on thermodynamic equilibrium, which comprises the following steps:
s1, testing the temperature and humidity value in the target rock-soil body by using a temperature and humidity instrument, and recording the temperature and humidity value of the rock-soil body in a thermodynamic equilibrium state;
according to the theory and research of thermodynamics, the occurrence states of water in rock and soil bodies under different temperature conditions are different, and the conversion rates of gaseous water and liquid water are different, so that the measurement of the moisture content and the water content of the rock and soil bodies is based on the premise of accurate measurement of the temperature and the humidity.
And testing the temperature and humidity value in the target rock-soil body by using a temperature and humidity instrument, and recording the temperature value when the relative humidity value in the rock-soil body is 100%. To avoid the contingency of the test results, three or more sets of data can be tested and the temperature values recorded separately.
S2, taking a rock-soil body sample, and testing the porosity or fracture rate of the rock-soil body; the porosity of soil is tested by a seepage experiment in a laboratory, and for testing the rock fracture rate, the method adopts an instrument named as a method for measuring the rock body fracture rate to test the fracture rate;
the pores or the cracks are spaces for water in rock and soil bodies to migrate and are places for water-vapor conversion reaction. Therefore, the size of the porosity (fracture rate) directly determines the size of the moisture endowing amount in the rock-soil body;
in order to avoid the contingency of the test results, three or more groups of data should be tested, and the average value thereof is used as the value of the porosity or fracture rate of the rock-soil body.
S3, substituting the temperature value tested in the S1 and the porosity value tested in the S2 into a calculation formula of the water content and the water content to obtain the values of the water content and the water content of the rock-soil body;
when the system is in a thermodynamic equilibrium state, the internal relative humidity of a water-containing system of rock-soil mass is 100%, and the system mainly has the following three properties: firstly, the system is in thermal balance, namely the internal temperature of the system is equal everywhere, and the heat transfer does not exist; the system is in force balance, i.e. the pressure inside the system (physical pressure) is equal everywhere; and thirdly, the system is in phase equilibrium, namely the chemical potential inside the system is equal everywhere. The water-vapor conversion reaction reaches dynamic balance, and the interaction force between the solid phase and the liquid phase is offset everywhere, so that the liquid water and the gaseous water have the following relational expression:
suppose that
And due to the following relationship:
Vp＝Vwater+Vvapor
the calculation formula of the water content of the rock-soil body can be deduced as follows:
the calculation formula of the water content of the rock-soil body can be deduced as follows:
wherein Wv (T) represents the water content of rock-soil mass at temperature T, and mwater(T) represents the mass of liquid water at temperature T, pwater(T) represents the density of liquid water at temperature T, Vwater(T) represents the volume of liquid water at temperature T, mvapor(T) represents the mass of gaseous water at temperature T, pvapor(T) represents the density of gaseous water at temperature T, Vvapor(T) represents the volume of gaseous water at temperature T, VpRepresenting pores of a rock-soil massDegree (crack rate), k (T) denotes the equilibrium constant at temperature T, α (T) denotes the mass ratio of liquid and gaseous water as a function of temperature T, and β (T) denotes the density ratio of liquid and gaseous water as a function of temperature T.
The liquid water and gaseous water quality alpha (T) ratio and density beta (T) ratio under different temperatures are tested and fitted to obtain a function of the liquid water and gaseous water quality alpha (T) ratio and the density beta (T) ratio with the temperature as follows:
α(T)＝8.801×105×e-0.057T
β(T)＝2.037×105×e-0.064T
and substituting the temperature value tested in the S1 and the porosity value tested in the S2 into a calculation formula of the water content and the water content to obtain the values of the water content and the water content of the rock-soil body, and then calculating an average value.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A method for testing the water content and water content of rock-soil mass based on thermodynamic equilibrium is characterized by comprising the following steps:
s1, testing the temperature and humidity value in the target rock-soil body by using a temperature and humidity instrument, and recording the temperature and humidity value of the rock-soil body in a thermodynamic equilibrium state;
s2, taking rock-soil mass samples, and testing the porosity or fracture rate of the rock-soil mass in a laboratory;
s3, substituting the temperature value tested in the S1 and the porosity or fracture rate value tested in the S2 into a formula for calculating the water content and the water content to obtain the water content and the water content value of the rock-soil body;
the formulas for calculating the water content and the water content are respectively as follows:
wherein Wv (T) represents the water content of rock-soil mass at temperature T, and mwater(T) represents the mass of liquid water in the rock-soil mass at temperature T, pwater(T) represents the density of liquid water at temperature T, VpThe porosity or the fissure rate of the rock-soil body is represented, alpha (T) represents the function relation of the mass ratio of the liquid water and the gaseous water and the temperature T, and beta (T) represents the function relation of the density ratio of the liquid water and the gaseous water and the temperature T.
2. The method for testing the water content and water content of the rock-soil mass based on the thermodynamic equilibrium of claim 1, wherein the relative humidity value of the thermodynamic equilibrium state in S1 is 100%.
3. The method for testing water content and water content of rock-soil mass based on thermodynamic equilibrium of claim 1, wherein the porosity of the porosity test in S2 is effective porosity, and in order to avoid the contingency of the test result, three or more groups of data should be tested, and the average value is used as the porosity value.
4. The method for testing the water content and water content of the rock-soil mass based on the thermodynamic equilibrium as claimed in claim 1, wherein the specific formulas of α (T) and β (T) are as follows:
α(T)＝8.801×105×e-0.057T
β(T)＝2.037×105×e-0.064T
wherein α (T) represents a function of the mass ratio of liquid water to gaseous water as a function of temperature T, β (T) represents a function of the density ratio of liquid water to gaseous water as a function of temperature T, and T represents temperature.
5. The method for testing water content and water content of rock-soil mass based on thermodynamic equilibrium according to claim 1, wherein the water content calculated by the test in S3 is water content per unit volume.
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|---|---|---|---|---|
| CN102393320A (en) * | 2011-09-21 | 2012-03-28 | 中国科学院武汉岩土力学研究所 | Preparation method of rock test samples with different water ratios |
| CN105651677A (en) * | 2016-03-08 | 2016-06-08 | 中国地质大学（武汉） | Geotechnical parameter and property tester capable of simultaneously testing specific yield and osmotic coefficient |
| CN105910867A (en) * | 2016-05-05 | 2016-08-31 | 河南理工大学 | Simple device for quickly preparing rock soil samples different in water content |
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| CN105910867A (en) * | 2016-05-05 | 2016-08-31 | 河南理工大学 | Simple device for quickly preparing rock soil samples different in water content |
| CN106124386A (en) * | 2016-09-01 | 2016-11-16 | 中国地质大学（武汉） | A kind of undisturbed soil effecive porosity analyzer |
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| CN110186643A (en) * | 2019-05-10 | 2019-08-30 | 中国地质大学（武汉） | A method of monitoring crack rock unsaturation is with vapor transport rule |
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