CN116481998A - Low-permeability non-hydrophilic solid-fluid coupling similar material proportioning test method - Google Patents
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- 239000000463 material Substances 0.000 title claims abstract description 92
- 230000008878 coupling Effects 0.000 title claims abstract description 18
- 238000010168 coupling process Methods 0.000 title claims abstract description 18
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 18
- 239000012530 fluid Substances 0.000 title claims abstract description 17
- 238000010998 test method Methods 0.000 title claims abstract description 15
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 156
- 238000012360 testing method Methods 0.000 claims abstract description 94
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 78
- 239000012188 paraffin wax Substances 0.000 claims abstract description 69
- 229940099259 vaseline Drugs 0.000 claims abstract description 56
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 54
- 239000004576 sand Substances 0.000 claims abstract description 52
- 230000035699 permeability Effects 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- -1 vaseline Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 17
- 230000003204 osmotic effect Effects 0.000 claims description 15
- 238000004364 calculation method Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 239000010690 paraffinic oil Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- 230000003487 anti-permeability effect Effects 0.000 claims description 3
- 238000012669 compression test Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 abstract description 5
- 239000011435 rock Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
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- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000012237 artificial material Substances 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
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- 238000006073 displacement reaction Methods 0.000 description 1
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- 229910052602 gypsum Inorganic materials 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to the technical field of similarity simulation, and discloses a low-permeability non-hydrophilic solid-fluid coupling similar material proportioning test method, wherein S1 is that similar materials are selected: river sand, paraffin, vaseline and hydraulic oil are selected as similar materials for test; s2, mixing similar materials: adding calcium carbonate in different proportions; s3, heating similar materials: heating similar materials respectively; s4, molding similar materials: manufacturing a test piece from similar materials; s5, measuring strength and permeability coefficient; s6, selecting the optimal proportion of calcium carbonate: selecting the optimal proportion of calcium carbonate; s7, determining the optimal proportion of similar materials. The invention can obtain the optimal proportion of river sand, paraffin, vaseline, hydraulic oil and calcium carbonate; the similar materials can meet the requirements of water resistance, disintegration resistance, softening resistance, low permeability, low strength and low plasticity, can simulate low-strength rock-like rock of water-containing underground engineering, and provide basis for reasonable selection of similar materials with different lithology.
Description
Technical Field
The invention relates to the technical field of similarity simulation, in particular to a low-permeability non-hydrophilic solid-fluid coupling similar material proportioning test method.
Background
The simulation experiment research is an important research means in the mining industry, by using artificial materials with similar physical and mechanical properties to natural rock, shrinking the manufactured model according to the actual prototype of the mine and following the similar principle, then simulating underground mining activities such as tunnel excavation or working face mining in the model, monitoring the deformation, displacement, damage, pressure and the like of the model, and adopting the method to simulate the overburden mining process, the deformation damage rule is researched, so that a great amount of observation cost can be saved, and the result is more visual. The influence mechanism of different factors on coal exploitation in a water body is researched by changing experimental conditions, a solid-fluid coupling similar simulation test is needed, and the properties and parameters of the solid-fluid coupling similar material are key for determining the scientificity and accuracy of a simulation test result; therefore, similar materials are required to have similar physical and mechanical properties, as well as low permeability and non-hydrophilicity.
The Chinese patent discloses a similar material for simulating a weak reinforcing layer of a shield tunnel and a test method (publication No. CN 109020446A), the technology of the patent adopts gypsum as a cementing material, can greatly reduce initial setting, final setting and maintenance time, has more accurate and reliable indoor test data, can provide accurate and reliable test basis for the design, construction and maintenance of the shield tunnel engineering in the future, but cannot obtain the optimal proportion of the similar material, and further cannot provide basis for reasonable selection of different lithology similar materials.
Disclosure of Invention
The invention aims to provide a low-permeability non-hydrophilic solid-fluid coupling similar material proportioning test method, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a low-permeability non-hydrophilic solid-fluid coupling similar material proportioning test method comprises the following steps:
s1, selecting similar materials: according to the characteristics of water resistance, disintegration, softening, compactness, permeability, strength and plasticity of the material, river sand, paraffin, vaseline and hydraulic oil are selected as similar materials for testing, so that the material can meet a similar theory, and has good water resistance, good disintegration resistance and softening resistance when meeting (soaking) water, compact material, low permeability, low strength and low plasticity, and the non-hydrophilicity of the material is ensured;
s2, mixing similar materials: mixing river sand, paraffin, vaseline and hydraulic oil according to the mechanical strength of the materials to be tested, keeping the mixture ratio of the river sand, the paraffin, the vaseline and the hydraulic oil unchanged, and adding calcium carbonate with different proportions;
s3, heating similar materials: according to different proportioning schemes, river sand and calcium carbonate are respectively placed in a container and fully and uniformly stirred to obtain coarse and fine aggregate; heating coarse and fine aggregate, vaseline, paraffin and hydraulic oil respectively;
s4, molding similar materials: pouring the heated coarse and fine aggregate, vaseline, paraffin and hydraulic oil in the step S3 into a container, rapidly stirring to be uniform, putting into a mould, compacting, tamping, standing for 20min, preparing a test piece, and demoulding after the test piece is cooled; curing under natural condition until the materials are completely dried, and then numbering the groups;
s5, measuring strength and permeability coefficient: carrying out a uniaxial compression test on each test piece by adopting a universal testing machine, and measuring the uniaxial compressive strength of the test piece; then, carrying out an anti-permeability test on each test piece by using a permeability tester, measuring the permeability coefficient of each test piece, calculating the average uniaxial compressive strength and the permeability coefficient of each group, and carrying out fitting comparison with a calculation formula of each test piece;
s6, selecting the optimal proportion of calcium carbonate: according to the uniaxial compressive strength and the permeability coefficient obtained in the step S5, analyzing the influence of calcium carbonate with different proportions on the characteristics of similar materials, and according to the analysis result, obtaining the calcium carbonate proportion when the uniaxial compressive strength and the permeability coefficient are optimal; selecting the calcium carbonate ratio as the optimal ratio of similar test materials;
s7, determining the optimal ratio of similar materials: adopting the calcium carbonate proportion selected in the step S6, keeping the proportion of river sand, paraffin, vaseline and calcium carbonate unchanged, selecting a single factor test method, adding paraffin with different proportions, repeating the steps S3 and S4, obtaining a new test piece under the optimal proportion of the calcium carbonate, measuring the uniaxial compressive strength and the osmotic coefficient of the new test piece again, and carrying out fitting comparison with a calculation formula of the new test piece to obtain the paraffin proportion when the uniaxial compressive strength and the osmotic coefficient are optimal; and the optimal proportion of river sand, paraffin, vaseline, hydraulic oil and calcium carbonate is obtained, so that basis can be provided for reasonable selection of similar materials with different lithology.
As still further aspects of the invention: in the step S3, vaseline and paraffin are heated to a molten state by adopting a water bath, hydraulic oil is heated to 60 ℃ by adopting a water bath, and coarse and fine aggregates are directly put into a hot pot to be fried to 80 ℃ so as to ensure that the aggregates are heated uniformly.
As still further aspects of the invention: in the step S4, the temperature is not lower than 50 ℃ in the stirring process, and the model size of the die is phi 50 multiplied by 100mm.
As still further aspects of the invention: in the step S5, under the condition that the proportions of river sand, paraffin, vaseline and hydraulic oil are unchanged and the proportions of calcium carbonate are different, the calculation formula of the permeability coefficient of the test piece is as follows:
y＝4.47945e -x/0.55859 +0.00994 (1)
in the formula (1), x is the mass proportion of calcium carbonate; y is the permeability coefficient of the test piece under the condition that the mixture ratio of river sand, paraffin, vaseline and hydraulic oil is unchanged and the mixture ratio of calcium carbonate is different.
As still further aspects of the invention: in the step S5, under the condition that the proportions of river sand, paraffin, vaseline and hydraulic oil are unchanged and the proportions of calcium carbonate are different, the calculation formula of the uniaxial compressive strength of the test piece is as follows:
Y＝12.288x 2 -9.532x+86.665 (2)
in the formula (2), x is the mass ratio of calcium carbonate; y is uniaxial compressive strength of the test piece under the condition that the ratio of river sand to paraffin to vaseline to hydraulic oil is unchanged and the ratio of calcium carbonate is different.
As still further aspects of the invention: in the step S6, under the condition that the proportions of river sand, vaseline, hydraulic oil and calcium carbonate are unchanged and the proportions of paraffin are different, the calculation formula of the uniaxial compressive strength of the test piece is as follows:
Y'＝359.48x'-94.76 (3)
in the formula (3), x' is the mass proportion of paraffin; y' is uniaxial compressive strength of the test piece under the condition that the proportions of river sand, vaseline, hydraulic oil and calcium carbonate are unchanged and the proportions of paraffin are different.
Compared with the prior art, the invention has the beneficial effects that:
the method sequentially comprises the steps of selecting similar materials, proportioning the similar materials, heating the similar materials, forming the similar materials, measuring strength and permeability coefficient, and selecting the optimal proportion of calcium carbonate to determine the optimal proportion of the similar materials; obtaining the optimal ratio of river sand, paraffin, vaseline, hydraulic oil and calcium carbonate; the similar materials can meet the requirements of water resistance, disintegration resistance, softening resistance, low permeability, low strength and low plasticity, can simulate low-strength rock-like rock of water-containing underground engineering, and provide basis for reasonable selection of similar materials with different lithology.
Drawings
FIG. 1 is a schematic flow chart of a method for testing the low-permeability non-hydrophilic solid-fluid coupling similar material proportioning;
FIG. 2 is a graph showing the characteristics of calcium carbonate change in a low-permeability non-hydrophilic solid-fluid coupling similar material proportioning test method;
FIG. 3 is a graph of stress versus strain for different ratios in a low permeability non-hydrophilic solid flow coupling similar material ratio test method;
FIG. 4 is a graph showing paraffin variation characteristics of a low-permeability non-hydrophilic solid-fluid coupling similar material proportioning test method.
Detailed Description
In the embodiment of the invention, a low-permeability non-hydrophilic solid-fluid coupling similar material proportioning test method comprises the following steps:
s1, selecting similar materials: according to the water resistance, disintegration, softening, compaction, permeability, strength and plasticity of the materialIs characterized in that river sand, paraffin, vaseline and hydraulic oil are selected as similar materials for test, wherein the river sand is clean river sand with the particle size smaller than 0.5mm, and the paraffin is 58 # Industrial crude paraffin, hydraulic oil 46 # Antiwear hydraulic oil;
s2, mixing similar materials: mixing river sand, paraffin, vaseline and hydraulic oil according to the mechanical strength of the test materials (the ratio can be obtained empirically or can be obtained from inquiry literature data, for example, the mass ratio of river sand to paraffin to vaseline to hydraulic oil is 40:0.8:1:1), keeping the ratio of river sand to paraffin to vaseline to hydraulic oil unchanged, and adding calcium carbonate with different proportions (for example, 0-5 groups of test pieces are prepared by adding calcium carbonate with the proportions of 0, 1, 2, 3, 4 and 5 based on the mass ratio of river sand to paraffin to vaseline to hydraulic oil is 40:0.8:1:1 respectively, specifically shown in the following table 1);
s3, heating similar materials: according to different proportioning schemes, river sand and calcium carbonate are respectively placed in a container and fully and uniformly stirred to obtain coarse and fine aggregate; heating coarse and fine aggregate, vaseline, paraffin and hydraulic oil respectively; wherein, vaseline and paraffin are heated to a molten state by adopting a water bath, hydraulic oil is heated to 60 ℃ by adopting a water bath, and coarse and fine aggregates are directly put into a hot pot for stir-frying to 80 ℃;
s4, molding similar materials: pouring the heated coarse and fine aggregate, vaseline, paraffin and hydraulic oil in the step S3 into a container, rapidly stirring to be uniform, ensuring that the temperature is not lower than 50 ℃ in the stirring process, compacting and tamping in a mould with the model size of phi 50 multiplied by 100mm, standing for 20min, manufacturing a test piece, and demoulding after the test piece is cooled; curing under natural conditions until the materials are completely dried, numbering the materials in groups, taking 3 test pieces according to each proportion, dividing the test pieces into 10 groups, namely 0-1, 0-2, 0-3, … …,9-1, 9-2 and 9-3, and measuring the height, quality and density of each test piece;
s5, measuring strength and permeability coefficient: carrying out a uniaxial compression test on each test piece by adopting a universal testing machine, and measuring the uniaxial compressive strength of the test piece; then, carrying out an anti-permeability test on each test piece by using a permeability tester, measuring the permeability coefficient of each test piece, calculating the average uniaxial compressive strength and the permeability coefficient of each group, and carrying out fitting comparison with a calculation formula of each test piece; the ratio of river sand, paraffin, vaseline and hydraulic oil is unchanged, and under the condition that the ratios of calcium carbonate are different, the osmotic coefficient of the test piece is calculated as follows:
y＝4.47945e -x/0.55859 +0.00994 (1)
in the formula (1), x is the mass proportion of calcium carbonate; y is the permeability coefficient of the test piece in a state that the ratio of river sand, paraffin, vaseline and hydraulic oil is unchanged and the ratio of calcium carbonate is different, and the unit is 10 -4 cm/s；
The ratio of river sand, paraffin, vaseline and hydraulic oil is unchanged, and under the condition that the ratio of calcium carbonate is different, the calculation formula of the uniaxial compressive strength of the test piece is as follows:
Y＝12.288x 2 -9.532x+86.665 (2)
in the formula (2), x is the mass ratio of calcium carbonate; y is uniaxial compressive strength of the test piece in unit kPa under the condition that the ratio of river sand to paraffin to vaseline to hydraulic oil is unchanged and the ratio of calcium carbonate is different;
in a state that the ratio of river sand, paraffin, vaseline and hydraulic oil is unchanged, a characteristic curve chart of uniaxial compressive strength and osmotic coefficient along with the ratio change of calcium carbonate is drawn, and is shown in the following figure 2; under different proportions, similar materials have different stress and strain, such as river sand: paraffin wax: vaseline: hydraulic oil: the mass ratio of the calcium carbonate is 40:0.8:1:1: the stress and strain curves for similar materials at 1 and 40:0.8:1:1:5 are shown in FIG. 3.
S6, selecting the optimal proportion of calcium carbonate: according to the uniaxial compressive strength and the permeability coefficient obtained in the step S5, analyzing the influence of calcium carbonate with different proportions on the characteristics of similar materials, and according to the analysis result, obtaining the calcium carbonate proportion when the uniaxial compressive strength and the permeability coefficient are optimal; selecting the calcium carbonate ratio as the optimal ratio of similar test materials;
s7, determining the optimal ratio of similar materials: adopting the calcium carbonate proportion selected in the step S6, keeping the proportion of river sand, paraffin, vaseline and calcium carbonate unchanged, selecting a single factor test method, adding paraffin with different proportions, repeating the steps S3 and S4, obtaining a new test piece (for example, a 6-9 group of test pieces are the paraffin proportion when the mass ratio of river sand to vaseline to hydraulic oil to calcium carbonate is 40:1:1:3, respectively adding paraffin with 0.4, 0.5, 0.6 and 0.7 proportions, and particularly see the following table 1), measuring the uniaxial compressive strength and the osmotic coefficient of the new test piece again, and performing fitting comparison with a calculation formula of the new test piece to obtain the paraffin proportion when the uniaxial compressive strength and the osmotic coefficient are optimal; thereby obtaining the optimal proportion of river sand, paraffin, vaseline, hydraulic oil and calcium carbonate;
the ratio of river sand, vaseline, hydraulic oil and calcium carbonate is unchanged, and under the condition that the ratios of paraffin are different, the calculation formula of the uniaxial compressive strength of the test piece is as follows:
Y'＝359.48x'-94.76 (3)
in the formula (3), x' is the mass proportion of paraffin; y' is the uniaxial compressive strength of the test piece in unit kPa under the condition that the proportions of river sand, vaseline, hydraulic oil and calcium carbonate are unchanged and the proportions of paraffin are different;
because the permeability coefficient of the test piece changes little in the state that the proportions of river sand, vaseline, hydraulic oil and calcium carbonate are unchanged and the proportions of paraffin are different, the permeability coefficient of the test piece is not calculated through a formula;
in a state that the ratio of river sand, vaseline and calcium carbonate is unchanged, a characteristic curve diagram of uniaxial compressive strength and osmotic coefficient along with the change of paraffin ratio is drawn, and is shown in the following figure 4.
(1) River sand: paraffin wax: vaseline: the mass ratio of the hydraulic oil is 40:0.8:1:1, and remain unchanged; calcium carbonate in the proportions of 0, 1, 2, 3, 4 and 5 was added respectively, and the uniaxial compressive strength and the permeability coefficient of the test block were measured and recorded in the following table 1;
(2) River sand: vaseline: hydraulic oil: the mass ratio of the calcium carbonate is 40:1:1:3, and keeping unchanged; paraffin wax was added in the proportions of 0.4, 0.5, 0.6 and 0.7, respectively, and the uniaxial compressive strength and permeability coefficient of the new test block were measured and recorded in table 1 below;
TABLE 1 uniaxial compressive Strength and permeation coefficient analysis Table of similar materials at different ratios
From table 1 and fig. 2, it can be derived that:
1) The permeability coefficient gradually decreases with the increase of the content of calcium carbonate; as can be seen by combining fig. 2, table 1 and formula 1, the osmotic coefficient and the content of calcium carbonate are in negative exponential relationship, and the osmotic coefficient is obviously reduced within the range of 0-2 in content proportion; after the content ratio exceeds 2, the osmotic coefficient is gradually reduced, and the osmotic coefficient value is reduced to be very small, the level of the osmotic coefficient is 10 of that of the raw material -4 cm/s down to 10 -6 cm/s; it can be seen that the content of calcium carbonate has a significant effect on the permeability coefficient of the material.
2) Along with the increase of the content of calcium carbonate, the uniaxial compressive strength of the test piece is gradually increased; as can be seen by combining fig. 2, table 1 and formula 2, the uniaxial compressive strength of the test piece and the content of calcium carbonate are in a quadratic polynomial relation, and the uniaxial compressive strength increases relatively slowly in the content ratio ranging from 0 to 3; after the content ratio exceeds 3, the increase of the uniaxial compressive strength is obviously increased; it can be seen that the content of calcium carbonate has a more pronounced effect on uniaxial compressive strength.
And then can be derived: the effect of the content of calcium carbonate on the permeability coefficient and uniaxial compressive strength of the material is both remarkable. Combining the characteristics of low strength (50.13 kpa-125 kpa), low permeability and low plasticity of the materials required by the test, according to the characteristic curve graphs (i.e. figure 2) of different calcium carbonate ratios to similar material parameters, finally river sand in the non-hydrophilic similar material: paraffin wax: vaseline: hydraulic oil: formulation of calcium carbonateThe ratio of the materials is selected to be 40:0.8:1:1:3 based on the standard, the uniaxial compressive strength of the similar materials is 200kPa, and the osmotic coefficient is 10 -6 cm/s。
On the basis of ensuring that the magnitude of the permeability coefficient basically meets the test requirement, the following tests are carried out by adjusting the paraffin content and refining the material proportions with different intensities:
because the compressive strength of the material required by the test is 50.13 kpa-125 kpa and is smaller than that of the material with the proportion standard, the proportion of paraffin is reduced on the basis of the proportion standard, four groups of test pieces with paraffin content of 0.4, 0.5, 0.6 and 0.7 are respectively configured, and parameter tests are carried out, and the test results of the test pieces are shown in the table 1 in the specification of 6-9 groups; and drawing a characteristic curve graph of each proportioning material according to the test result, see fig. 4.
As can be seen from fig. 4 and formula 3, when the calcium carbonate ratio is 3, the uniaxial compressive strength of the test piece is significantly affected by the paraffin, and the uniaxial compressive strength tends to increase substantially linearly with the paraffin content; the permeability coefficient gradually decreases with the increase of the paraffin content, but the decrease is gentle, and the magnitude of the permeability coefficient is 10 -6 cm/s；
From the analysis, when the content ratio of calcium carbonate is 3 and the content ratio of paraffin is 0.4-0.8, the material ratio (river sand: vaseline: hydraulic oil ratio is 40:1:1) can meet the basic requirements of the test material on water resistance, disintegration resistance, softening resistance, low permeability, low strength and low plasticity.
The foregoing description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (6)
1. The low-permeability non-hydrophilic solid-fluid coupling similar material proportioning test method is characterized by comprising the following steps of:
s1, selecting similar materials: according to the characteristics of water resistance, disintegration, softening, compactness, permeability, strength and plasticity of the material, river sand, paraffin, vaseline and hydraulic oil are selected as similar materials for test;
s2, mixing similar materials: mixing river sand, paraffin, vaseline and hydraulic oil according to the mechanical strength of the materials to be tested, keeping the mixture ratio of the river sand, the paraffin, the vaseline and the hydraulic oil unchanged, and adding calcium carbonate with different proportions;
s3, heating similar materials: according to different proportioning schemes, river sand and calcium carbonate are respectively placed in a container and fully and uniformly stirred to obtain coarse and fine aggregate; heating coarse and fine aggregate, vaseline, paraffin and hydraulic oil respectively;
s4, molding similar materials: pouring the heated coarse and fine aggregate, vaseline, paraffin and hydraulic oil in the step S3 into a container, rapidly stirring to be uniform, putting into a mould, compacting, tamping, standing for 20min, preparing a test piece, and demoulding after the test piece is cooled; curing under natural condition until the materials are completely dried, and then numbering the groups;
s5, measuring strength and permeability coefficient: carrying out a uniaxial compression test on each test piece by adopting a universal testing machine, and measuring the uniaxial compressive strength of the test piece; then, carrying out an anti-permeability test on each test piece by using a permeability tester, measuring the permeability coefficient of each test piece, calculating the average uniaxial compressive strength and the permeability coefficient of each group, and carrying out fitting comparison with a calculation formula of each test piece;
s6, selecting the optimal proportion of calcium carbonate: according to the uniaxial compressive strength and the permeability coefficient obtained in the step S5, analyzing the influence of calcium carbonate with different proportions on the characteristics of similar materials, and according to the analysis result, obtaining the calcium carbonate proportion when the uniaxial compressive strength and the permeability coefficient are optimal; selecting the calcium carbonate ratio as the optimal ratio of similar test materials;
s7, determining the optimal ratio of similar materials: adopting the calcium carbonate proportion selected in the step S6, keeping the proportion of river sand, paraffin, vaseline and calcium carbonate unchanged, selecting a single factor test method, adding paraffin with different proportions, repeating the steps S3 and S4, obtaining a new test piece under the optimal proportion of the calcium carbonate, measuring the uniaxial compressive strength and the osmotic coefficient of the new test piece again, and carrying out fitting comparison with a calculation formula of the new test piece to obtain the paraffin proportion when the uniaxial compressive strength and the osmotic coefficient are optimal; so as to obtain the optimal mixture ratio of river sand, paraffin, vaseline, hydraulic oil and calcium carbonate.
2. The method for testing the low-permeability non-hydrophilic solid-fluid coupling similar materials according to claim 1, wherein in the step S3, vaseline and paraffin are heated to a molten state by a water bath, hydraulic oil is heated to 60 ℃ by the water bath, and coarse and fine aggregates are directly placed into a hot pot to be fried to 80 ℃.
3. The method according to claim 1, wherein in the step S4, the temperature is not lower than 50 ℃ during stirring, and the model size of the mold is Φ50×100mm.
4. The method for testing the mixture ratio of the low-permeability non-hydrophilic solid-fluid coupling similar materials according to claim 1, wherein in the step S5, the mixture ratio of river sand, paraffin, vaseline and hydraulic oil is unchanged, and the calculation formula of the permeability coefficient of the test piece is as follows in the state that the mixture ratio of calcium carbonate is different:
y＝4.47945e -x/0.55859 +0.00994 (1)
in the formula (1), x is the mass proportion of calcium carbonate; y is the permeability coefficient of the test piece under the condition that the mixture ratio of river sand, paraffin, vaseline and hydraulic oil is unchanged and the mixture ratio of calcium carbonate is different.
5. The method for testing the mixture ratio of the low-permeability non-hydrophilic solid-fluid coupling similar materials according to claim 1, wherein in the step S5, the mixture ratio of river sand, paraffin, vaseline and hydraulic oil is unchanged, and the calculation formula of the uniaxial compressive strength of the test piece is as follows in the state that the mixture ratio of calcium carbonate is different:
Y＝12.288x 2 -9.532x+86.665 (2)
in the formula (2), x is the mass ratio of calcium carbonate; y is uniaxial compressive strength of the test piece under the condition that the ratio of river sand to paraffin to vaseline to hydraulic oil is unchanged and the ratio of calcium carbonate is different.
6. The method for testing the mixture ratio of the low-permeability non-hydrophilic solid-fluid coupling similar materials according to claim 1, wherein in the step S7, the mixture ratio of river sand, vaseline, hydraulic oil and calcium carbonate is unchanged, and the calculation formula of the uniaxial compressive strength of the test piece is as follows in the state that the mixture ratio of paraffin is different:
Y'＝359.48x'-94.76 (3)
in the formula (3), x' is the mass proportion of paraffin; y' is uniaxial compressive strength of the test piece under the condition that the proportions of river sand, vaseline, hydraulic oil and calcium carbonate are unchanged and the proportions of paraffin are different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202310527043.4A CN116481998A (en) | 2023-05-08 | 2023-05-08 | Low-permeability non-hydrophilic solid-fluid coupling similar material proportioning test method |
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